Instruction Manual for LENNOX models including: LCT Series, LCT Series Rooftop Units, Rooftop Units
stallation instructions and all applicable codes. See acces- sories section ... WI RI NG. SEE I AQ. WI RI NG DI AGRAM. GN. D. MODBUS. CABLE. W/ RJ - 45. 1.
UNIT INFORMATION 100142
Service Literature
LCT SERIES
25 & 30 ton
LCT302 - 360 With R-454B
The LCT302H / 360H (25 and 30 ton) units are configured to order units (CTO) with a wide selection of factory-installed options. Optional electric heat is factory-or field-installed in LCT units. Electric heat operates in single or multiple stages depending on the kW input size. 30kW through 120kW heat sections are available..
Units may contain a supply air blower equipped with a variable frequency drive A96 (VFD) which varies supply air CFM.
If the unit must be lifted for service, rig unit by attaching four cables to the holes located in the unit base rail (two holes at each corner). Refer to the installation instructions for the proper rigging technique.
WARNING
Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance, or an operating electric heater). Do not pierce or burn. Be aware that refrigerants may not contain an odor.
WARNING
If this appliance is conditioning a space with an area smaller than TAmin or stored in a space with an area smaller than A min as defined by this instruction, then that space must be without continuously operating open flames (e.g. an operating gas appliance) or other potential ignition sources (e.g. an operating electric heater or similar hot surface). A flame-producing device may be installed in the same space if the device is provided with an effective flame arrest system.
WARNING
Auxiliary devices which may be potential ignition sources shall not be installed in the duct work. Examples of potential ignition sources are hot surfaces with a temperature exceeding 700°C and electric switching components.
False ceilings or drop ceiling may be used as a return air plenum only if the unit being installed has a Refrigerant Detection System installed.
All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out with work in confined spaces being avoided.
Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere.
Table of Contents Options / Accessories . . . . . . . . . . . . . . . . . . .Page 3
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .Page 7
Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
Electric Heat / Electrical Data . . . . . . . . . . . . . Page 14
Unit Parts Arrangement . . . . . . . . . . . . . . . . . . Page 19
I-Unit Components . . . . . . . . . . . . . . . . . . . . . . Page 21
RDS Sensors . . . . . . . . . . . . . . . . . . . . . . Page 28
II-Placement and Installation . . . . . . . . . . . . . . .Page 35
III-Start Up - Charging. . . . . . . . . . . . . . . . . . . . Page 35
IV-System Service Checks . . . . . . . . . . . . . . . . Page 42
V-Maintenance . . . . . . . . . . . . . . . .. . . . . . . . . .Page 42
VI-Accessories . . . . . . . . . . . . . . . . . . . . . . . . .Page 44
VII-Decommissioning. . . . . . . . . . . . . . . . . . . . .Page 52
VIII-Wiring and Operation Sequence . . . . . . . . Page 53
Page 1
WARNING
To prevent serious injury or death: 1- Lock-out/tag-out before performing maintenance. 2- If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove fan belt where applicable, and ensure all controllers and thermostats are set to the "OFF" position before performing maintenance. 3- Always keep hands, hair, clothing, jewelry, tools, etc., away from moving parts.
WARNING
Only Manufacturer approved auxiliary devices are permitted to be installed in this unit.
CAUTION
Any service personnel installing, decommissioning, or performing maintenance on the unit must be properly trained with A2L refrigerants.
WARNING
Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier.
CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC's and HCFC's) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for non-compliance.
WARNING
· This appliance must be installed in accordance with local and national wiring regulations. · If the appliance is not fitted with an option for full disconnection from power, a means of disconnection must be incorporated in the fixed wiring in accordance with national and local wiring regulations.
Page 2
OPTIONS / ACCESSORIES
Item Description
COOLING SYSTEM
Condensate Drain Trap
Drain Pan Overflow Switch Stainless Steel Condensate Drain Pan
PVC Copper
GAS HEAT
Combustion Air Intake Extensions (Order 2 Kits) Gas Heat Input
LPG/Propane Conversion Kits (Order 2 Kits)
Stainless Steel Heat Exchanger Vertical Vent Extension
Standard - 260 kBtuh input Medium - 360 kBtuh input High - 480 kBtuh input Standard Heat Medium Heat High Heat
BLOWER - SUPPLY AIR
Blower Type Motors
Drive Kits See Blower Data Tables for usage and selection
MSAV® Multi-Stage Air Volume VAV Variable Air Volume
Belt Drive (standard efficiency) - 5 HP Belt Drive (standard efficiency) - 7.5 HP Belt Drive (standard efficiency) - 10 HP
Supply VFD Blower Bypass Kit #1 740-895 rpm
Kit #2 870-1045 rpm Kit #3 715-880 rpm Kit #4 770-965 rpm Kit #5 660-810 rpm Kit #6 770-965 rpm Kit #7 570-720 rpm Kit #8 480-630 rpm Kit #9 410-535 rpm
CABINET
Combination Coil/Hail Guards
Corrosion Protection
Horizontal Return Air Panel Kit
NOTE - Order numbers shown are for ordering field installed accessories. OX - Configure To Order (Factory Installed) or Field Installed O = Configure To Order (Factory Installed) X = Field Installed
Order Number
22H54 76W27 21Z07 83W42
89L97 Factory Factory Factory 14N28 14N29 14N30 Factory 42W16
Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory Factory
13T16 Factory 38K48
Size
302
360
X
X
X
X
OX
OX
OX
OX
X
X
O
O
O
O
O
O
X
X
X
X
X
X
O
O
X
X
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
OX
OX
O
O
X
X
Page 3
OPTIONS / ACCESSORIES
Item Description
Order Number
Size
302
360
INDOOR AIR QUALITY
Air Filters
Healthy Climate® High Efficiency Air Filters
MERV 8 54W21
OX
OX
20 x 20 x 2 - order 12 per unit
MERV 13 52W39
OX
OX
MERV 16 21U40
X
X
Replaceable Media Filter with Metal Mesh Frame (includes Non-Pleated Filter Media)
44N60
X
X
20 x 20 x 2- order 12 per unit
Indoor Air Quality (CO2) Sensors
Sensor - Wall-mount, off-white plastic cover with LCD display
77N39
X
X
Sensor - Wall-mount, off-white plastic cover, no display
23V86
X
X
Sensor - Black plastic case, LCD display, rated for plenum mounting
87N52
X
X
Sensor - Black plastic case, no display, rated for plenum mounting
23V87
X
X
CO2 Sensor Duct Mounting Kit - for downflow applications
23Y47
X
X
Aspiration Box - for duct mounting non-plenum rated CO2 sensors (77N39)
90N43
X
X
Needlepoint Bipolar Ionization (NPBI) Needlepoint Bipolar Ionization (NPBI) Kit
TBD
X
X
UVC Germicidal Light Kit 1 Healthy Climate® UVC Light Kit (110/230v-1ph) Step-Down Transformers
TBD
X
X
460V primary, 230V secondary 10H20
X
X
575V primary, 230V secondary 10H21
X
X
ELECTRICAL
Voltage 60 Hz
208/230V - 3 phase Factory
O
O
460V - 3 phase Factory
O
O
575V - 3 phase Factory
O
O
HACR Circuit Breakers
Factory
O
O
² Short-Circuit Current Rating (SCCR) of 100kA (includes Phase/Voltage Detection)
O
O
³ Disconnect Switch
80 amp 54W85
OX
OX
150 amp 54W86
OX
OX
250 amp 54W87
OX
OX
GFI Service
15 amp non-powered, field-wired (208/230V, 460V only) 74M70
OX
OX
Outlets
, 15 amp factory-wired and powered (208/230V, 460V) Factory
O
O
20 amp non-powered, field-wired (208/230V, 460V, 575V) 67E01
X
X
20 amp non-powered, field-wired (575V) Factory
O
O
Weatherproof Cover for GFI
10C89
X
X
Phase/Voltage Detection
Factory
O
O
ELECTRIC HEAT
30 kW 45 kW 60 kW 90 kW
208/230V-3ph 30U68
OX
OX
460V-3ph 30U69
OX
OX
575V-3ph 30U70
OX
OX
208/230V-3ph 30U74
OX
OX
460V-3ph 30U75
OX
OX
575V-3ph 30U76
OX
OX
208/230V-3ph 30U80
OX
OX
460V-3ph 30U81
OX
OX
575V-3ph 30U82
OX
OX
208/230V-3ph 30U83
OX
OX
460V-3ph 30U84
OX
OX
575V-3ph 30U85
OX
OX
Lamps operate on 110-230V single-phase power supply. Step-down transformer may be ordered separately for 460V and 575V units. Alternately, 110V power supply may be used to directly power the UVC ballast(s). 1SCCR option is not available if the MOCP of the configured unit is greater than 200A. 2Disconnect Switch is furnished and factory installed with SCCR option 4If a factory installed disconnect switch is ordered with a factory installed GFI, the default disconnect size is 150 amps. 5Unit powered GFI Service Outlets are not available with SCCR option. Disconnect Switch or Circuit Breaker is required with unit powered GFI Service Outlets. 6Canada requires a minimum 20 amp circuit. Select 20 amp, non-powered, field wired GFI.
NOTE - Order numbers shown are for ordering field installed accessories. OX - Configure To Order (Factory Installed) or Field Installed O = Configure To Order (Factory Installed) X = Field Installed
Page 4
OPTIONS / ACCESSORIES
Item Description
7 HUMIDITROL® CONDENSER REHEAT OPTION Humiditrol® Dehumidification Option
Order Number
Factory
Size
302
360
O
O
ECONOMIZER
High Performance Economizer (Approved for California Title 24 Building Standards / AMCA Class 1A Certified)
High Performance Economizer
18X87
OX
OX
Downflow or Horizontal Applications - Includes Outdoor Air Hood, order Downflow or
Horizontal Barometric Relief Dampers separately.
Economizer Controls Differential Enthalpy (Not for Title 24) Sensible Control
Order 2 21Z09
OX
OX
Sensor is Furnished Factory
O
O
Single Enthalpy (Not for Title 24) Global
21Z09
OX
OX
Sensor Field Provided Factory
O
O
Building Pressure Control Differential Sensible
13J77
X
X
Sensor is Furnished Factory
O
O
Outdoor Air CFM Control Barometric Relief Dampers With Exhaust Hood Downflow Barometric Relief Dampers Horizontal Barometric Relief Dampers
13J76
X
X
76W17
OX
OX
33K78
OX
OX
OUTDOOR AIR
Outdoor Air Dampers With Outdoor Air Hood Motorized Manual
18X89
OX
OX
18X88
X
X
POWER EXHAUST
Standard Static, SCCR Rated
High Static with VFD 2 HP (731 - 932 rpm)
Power Exhaust Control Pressure Transducer Control
Available for 302H and 360H models only with MSAV® Multi-Stage Air Volume option. NOTE - Order numbers shown are for ordering field installed accessories. OX - Configure To Order (Factory Installed) or Field Installed O = Configure To Order (Factory Installed) X = Field Installed
208/230V 74W21
OX
OX
460V 74W22
OX
OX
575V 74W23
OX
OX
208/230V 83M89
X
X
460V 83M90
X
X
575V 83M91
X
X
13J77
X
X
Page 5
OPTIONS / ACCESSORIES
Item Description
ROOF CURBS Hybrid Roof Curbs, Downflow 14 in. height 18 in. height 24 in. height Standard Roof Curbs, Horizontal - Requires Horizontal Return Air Panel Kit 30 in. height - slab applications 41 in. height - rooftop applications Horizontal Return Air Panel Kit Required for Horizontal Applications with Roof Curb Insulation Kit For Standard Horizontal Curbs For 30 in. Curb For 41 in. Curb CEILING DIFFUSERS Step-Down - Order one Flush - Order one Transitions (Supply and Return) - Order one
NOTE - Order numbers shown are for ordering field installed accessories. OX - Configure To Order (Factory Installed) or Field Installed O = Configure To Order (Factory Installed) X = Field Installed
Order Number
11F62 11F63 11F64
11T90 11T97
38K48
73K33 73K35
LARTD30/36S LAFD30/36S LASRT30/36
45K74 45K75 33K80
Size
302
360
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Page 6
SPECIFICATIONS
25 TON
Model Nominal Tonnage Efficiency Type Blower Type
Cooling
Gross Cooling Capacity - Btuh
Performance
1 Net Cooling Capacity (Btuh)
1 AHRI Rated Air Flow (cfm)
Total Unit Power - kW
1 IEER (Btuh/Watt)
1 EER (Btuh/Watt)
Sound Rating Number
dBA
Refrigerant
Refrigerant Type
Charge
Without
Circuit 1
Reheat
Circuit 2
Circuit 3
Circuit 4
With
Circuit 1
Reheat
Circuit 2
Circuit 3
Circuit 4
Electric Heat Available
Compressor Type (number)
Outdoor
Net face area - ft.² (total)
Coils
Number of rows
Fins - in.
Outdoor
Motor HP (number and type)
Coil Fans
Rpm
Watts (total)
Diameter (Number) - in.
Blades
Total Air volume - cfm
Indoor
Net face area - ft.² (total)
Coils
Tube diameter - in.
Rows
Fins - in.
Condensate drain size (NPT) - in.
Expansion device type
3 Indoor
Nominal motor HP
Blower
Maximum usable motor output (US Only)
and
Motor - Drive kit number
Kit
Selection
LCT302H5V
LCT302H5M
25 Ton
25 Ton
High
High
VAV
MSAV®
Variable Air Volume
Multi-Stage Air Volume
309,000
309,000
300,000
300,000
8200
8200
26.2
26.2
14.3
15.8
11.4
11.4
95
95
R-454B
R-454B
6 lbs. 12 oz.
6 lbs. 12 oz.
6 lbs. 8 oz.
6 lbs. 8 oz.
6 lbs. 11 oz.
6 lbs. 11 oz.
6 lbs. 13 oz.
6 lbs. 13 oz.
- - -
6 lbs. 12 oz.
- - -
6 lbs. 8 oz.
- - -
6 lbs. 11 oz.
- - -
6 lbs. 13 oz.
See page 18
Scroll (4)
Scroll (4)
68.3
68.3
1
1
23
23
1/3 (6 PSC)
1/3 (6 PSC)
1075
1075
2500
2500
(6) 24
(6) 24
3
3
21,500
21,500
31.40
31.40
3/8
3/8
4
4
14
14
(1) 1 in.
(1) 1 in.
Balanced Port Thermostatic Expansion Valve,removable power head
5, 7.5, 10
5.75, 8.63, 11.5
5 HP
Kit 5 660-810 rpm
Kit 6 770-965 rpm
Kit 7 570-720 rpm
Kit 8 480-630 rpm
Kit 9 410-535 rpm
7.5 HP Kit 3 715-880 rpm Kit 4 770-965 rpm
10 HP
Kit 1 740-895 rpm
Kit 2 870-1045 rpm
Wheel (Number) diameter x width - in.
(2) 18 x 15
Filters
Type of filter
Fiberglass, disposable
Number and size - in.
(12) 20 x 20 x 2
Line voltage data (Volts-Phase-Hz)
208/230-3-60,
460-3-60,
575-3-60
NOTE - Net capacity includes evaporator blower motor heat deduction. Gross capacity does not include evaporator blower motor heat deduction.
Tested at conditions included in with AHRI Standard 340/360; 95°F outdoor air temperature and 80°F db/67°F wb entering evaporator air; minimum external duct static pressure.
Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required. Maximum usable output of motors furnished are shown. In Canada, nominal motor output is also maximum usable motor output. If motors of comparable
output are used, be sure to keep within the service factor limitations outlined on the motor nameplate.
Page 7
SPECIFICATIONS
30 TON
Model Nominal Tonnage Efficiency Type Blower Type
Cooling
Gross Cooling Capacity - Btuh
Performance
1 Net Cooling Capacity (Btuh)
1 AHRI Rated Air Flow (cfm)
Total Unit Power - kW
1 IEER (Btuh/Watt)
1 EER (Btuh/Watt)
Sound Rating Number
dBA
Refrigerant
Refrigerant Type
Charge
Without
Circuit 1
Reheat
Circuit 2
Option
Circuit 3
Circuit 4
With
Circuit 1
Reheat
Circuit 2
Option
Circuit 3
Circuit 4
Electric Heat Available
Compressor Type (number)
Outdoor
Net face area - ft.² (total)
Coils
Number of rows
Fins - in.
Outdoor
Motor HP (number and type)
Coil Fans
Rpm
Watts (total)
Diameter (Number) - in.
Blades
Total Air volume - cfm
Indoor
Net face area - ft.² (total)
Coils
Tube diameter - in.
Rows
Fins - in.
Condensate drain size (NPT) - in.
Expansion device type
3 Indoor
Nominal motor HP
Blower and Kit
Maximum usable motor output (US Only) Motor - Drive kit number
Selection
LCT360H5V
LCT360H5M
30 Ton
30 Ton
High
High
VAV Variable Air Volume
MSAV® Multi-Stage Air Volume
360,000
360,000
350,000
350,000
8750
8750
32.5
32.5
13.5
14.2
10.8
10.8
95
95
R-454B
R-454B
6 lbs. 6 oz.
6 lbs. 6 oz.
6 lbs. 13 oz.
6 lbs. 13 oz.
6 lbs. 10 oz.
6 lbs. 10 oz.
6 lbs. 6 oz.
6 lbs. 6 oz.
- - -
7 lbs. 12 oz.
- - -
7 lbs. 8 oz.
- - -
6 lbs. 14 oz.
- - -
6 lbs. 12 oz.
See page 18
Scroll (4)
Scroll (4)
68.3
68.3
1
1
23
23
1/3 (6 PSC)
1/3 (6 PSC)
1075
1075
2500
2500
(6) 24
(6) 24
3
3
21,500
21,500
31.40
31.40
3/8
3/8
4
4
14
14
(1) 1 in.
(1) 1 in.
Balanced Port Thermostatic Expansion Valve,removable power head
5, 7.5, 10
5.75, 8.63, 11.5
5 HP Kit 5 660-810 rpm Kit 6 770-965 rpm Kit 7 570-720 rpm Kit 8 480-630 rpm Kit 9 410-535 rpm
7.5 HP Kit 3 715-880 rpm Kit 4 770-965 rpm
10 HP
Kit 1 740-895 rpm
Kit 2 870-1045 rpm
Wheel (Number) diameter x width - in.
(2) 18 x 15
Filters
Type of filter
Fiberglass, disposable
Number and size - in.
(12) 20 x 20 x 2
Line voltage data (Volts-Phase-Hz)
208/230-3-60,
460-3-60,
575-3-60
NOTE - Net capacity includes evaporator blower motor heat deduction. Gross capacity does not include evaporator blower motor heat deduction.
Tested at conditions included in with AHRI Standard 340/360; 95°F outdoor air temperature and 80°F db/67°F wb entering evaporator air; minimum external duct static pressure.
Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required. Maximum usable output of motors furnished are shown. In Canada, nominal motor output is also maximum usable motor output. If motors of comparable
output are used, be sure to keep within the service factor limitations outlined on the motor nameplate.
Page 8
BLOWER DATA
BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL & AIR FILTERS IN PLACE FOR ALL UNITS ADD:
1 - Wet indoor coil air resistance of selected unit. 2 - Any factory installed options air resistance (heat section, economizer, etc.) 3 - Any field installed accessories air resistance (duct resistance, diffuser, etc.)
Then determine from blower table blower motor output and drive required. See page 10 for wet coil and option/accessory air resistance data. See page 10 for factory installed drive kit specifications.
Air Volume
cfm
0.20 RPM BHP
0.40 RPM BHP
0.60 RPM BHP
0.80 RPM BHP
1.00 RPM BHP
TOTAL STATIC PRESSURE - In. w.g.
1.20
1.40
1.60
RPM BHP RPM BHP RPM BHP
1.80 RPM BHP
2.00 RPM BHP
2.20 RPM BHP
2.40 RPM BHP
2.60 RPM BHP
4000 372 0.26 433 0.65 497 0.99 565 1.27 630 1.54 687 1.79 738 2.04 784 2.30 824 2.56 861 2.82 897 3.10 932 3.40 - - - - - -
4500 382 0.41 441 0.79 506 1.12 574 1.41 638 1.69 694 1.95 744 2.22 790 2.50 831 2.77 868 3.05 903 3.35 938 3.66 974 4.01
5000 392 0.56 451 0.93 516 1.25 584 1.55 646 1.85 702 2.12 751 2.41 796 2.70 837 3.00 874 3.30 909 3.61 944 3.93 980 4.30
5500 402 0.73 462 1.08 527 1.40 594 1.72 655 2.02 710 2.31 758 2.61 802 2.92 843 3.24 880 3.56 916 3.88 951 4.22 987 4.60
6000 414 0.89 473 1.24 539 1.56 605 1.90 665 2.21 718 2.51 766 2.83 809 3.16 850 3.51 887 3.84 922 4.18 957 4.52 994 4.91
Page 9
6500 426 1.07 486 1.41 551 1.74 616 2.10 675 2.42 727 2.73 774 3.07 817 3.43 857 3.80 894 4.15 929 4.49 964 4.85 1001 5.24
7000 439 1.26 499 1.60 565 1.93 628 2.31 685 2.64 737 2.97 782 3.34 825 3.72 864 4.11 901 4.48 937 4.83 971 5.19 1008 5.59
7500 453 1.46 513 1.79 579 2.14 641 2.55 696 2.88 747 3.24 792 3.63 833 4.04 872 4.45 909 4.83 945 5.20 979 5.56 1016 5.97
8000 467 1.66 528 2.00 593 2.38 653 2.81 708 3.15 757 3.53 801 3.95 843 4.39 881 4.82 918 5.22 953 5.59 988 5.96 1025 6.37
8500 483 1.88 544 2.22 608 2.65 667 3.10 720 3.44 768 3.85 812 4.30 852 4.78 890 5.22 927 5.63 962 6.01 997 6.39 1034 6.81
9000 499 2.11 561 2.47 624 2.95 681 3.41 733 3.76 780 4.20 823 4.69 862 5.19 900 5.65 936 6.07 972 6.46 1007 6.85 1044 7.28
9500 516 2.36 578 2.75 640 3.26 696 3.73 746 4.10 792 4.58 834 5.11 873 5.64 910 6.12 946 6.54 982 6.93 1018 7.34 1055 7.78
10,000 534 2.64 596 3.06 657 3.60 711 4.07 760 4.48 805 5.00 845 5.57 884 6.12 921 6.61 957 7.03 992 7.43 1028 7.86 1066 8.32
10,500 553 2.93 615 3.39 674 3.95 727 4.44 775 4.90 817 5.46 857 6.06 895 6.62 932 7.12 967 7.55 1003 7.96 1039 8.40 1077 8.89
11,000 572 3.24 634 3.74 692 4.31 744 4.83 789 5.35 830 5.95 869 6.58 907 7.16 943 7.65 978 8.09 1013 8.51 1050 8.98 1089 9.49
11,500 592 3.58 653 4.12 711 4.70 760 5.27 803 5.85 843 6.49 881 7.13 918 7.71 954 8.21 989 8.65 1025 9.10 1062 9.59 1101 10.12
12,000 613 3.95 674 4.53 729 5.14 776 5.75 818 6.39 857 7.06 894 7.71 930 8.30 965 8.80 1000 9.25 1036 9.71 1073 10.22 - - - - - -
12,500 635 4.37 695 4.98 748 5.62 792 6.29 832 6.98 870 7.67 906 8.33 941 8.91 976 9.42 1011 9.87 1048 10.35 - - - - - - - - - - - -
13,000 657 4.83 715 5.50 766 6.18 808 6.89 847 7.61 883 8.32 918 8.98 953 9.56 988 10.06 - - - - - - - - - - - - - - - - - - - - - - - -
13,500 680 5.35 736 6.06 784 6.78 824 7.53 861 8.29 896 9.00 930 9.66 965 10.24 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
14,000 704 5.92 757 6.67 801 7.44 839 8.23 875 9.00 909 9.72 943 10.38 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
14,500 727 6.55 777 7.34 818 8.16 854 8.97 889 9.75 922 10.48 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
15,000 750 7.23 797 8.07 834 8.92 868 9.75 902 10.54 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
BLOWER DATA
DRIVE KIT SPECIFICATIONS
Motor Efficiency
Nominal HP
Maximum HP
Drive Kit Number
RPM Range
Standard
5
5.75
5
660 - 810
Standard
5
5.75
6
770 - 965
Standard
5
5.75
7
570 - 720
Standard
5
5.75
8
480 - 630
Standard
5
5.75
9
410 - 535
Standard
7.5
8.63
3
715 - 880
Standard
7.5
8.63
4
770 - 965
Standard
10
11.50
1
740 - 895
Standard
10
11.50
2
870 - 1045
NOTE - Using total air volume and system static pressure requirements determine from blower performance tables rpm and motor output required. Maximum usable output of motors furnished are shown. In Canada, nominal motor output is also maximum usable motor output. If motors of comparable output are used, be sure to keep within the service factor limitations outlined on the motor nameplate.
For VFD applications, nominal motor output is also maximum usable motor output.
FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE
Air Volume
cfm
Wet Indoor Coil
in. w.g.
Reheat Coil
in. w.g.
Gas Heat Exchanger
Standard Medium
Heat
Heat
High Heat
in. w.g. in. w.g. in. w.g.
Filters
Economizer
Horizontal MERV 8 MERV 13 MERV 16 Roof Curb
in. w.g. in. w.g. in. w.g. in. w.g. in. w.g.
4000
0.04
0.04
0.08
0.08
0.11
0.00
0.00
0.00
0.06
0.04
4500
0.04
0.04
0.09
0.10
0.13
0.00
0.00
0.00
0.07
0.05
5000
0.05
0.04
0.10
0.12
0.15
0.00
0.00
0.00
0.08
0.06
5500
0.06
0.06
0.11
0.14
0.17
0.01
0.00
0.01
0.09
0.07
6000
0.07
0.06
0.12
0.16
0.19
0.01
0.00
0.02
0.10
0.08
6500
0.08
0.08
0.13
0.18
0.21
0.01
0.01
0.02
0.11
0.09
7000
0.09
0.08
0.14
0.20
0.24
0.02
0.01
0.03
0.12
0.10
7500
0.10
0.10
0.15
0.21
0.25
0.02
0.01
0.04
0.13
0.11
8000
0.11
0.10
0.17
0.24
0.28
0.02
0.01
0.04
0.14
0.13
8500
0.12
0.10
0.20
0.27
0.31
0.03
0.01
0.04
0.15
0.15
9000
0.13
0.12
0.22
0.29
0.34
0.04
0.01
0.04
0.16
0.17
9500
0.14
0.14
0.24
0.32
0.38
0.04
0.02
0.06
0.17
0.19
10,000
0.15
0.16
0.27
0.36
0.42
0.05
0.02
0.06
0.18
0.21
10,500
0.16
0.17
0.30
0.40
0.46
0.06
0.02
0.06
0.19
0.24
11,000
0.18
0.18
0.33
0.43
0.50
0.07
0.02
0.07
0.20
0.27
11,500
0.19
0.19
0.37
0.48
0.55
0.08
0.02
0.08
0.22
0.30
12,000
0.20
0.20
0.40
0.52
0.60
0.10
0.02
0.08
0.23
0.33
12,500
0.21
0.22
0.44
0.57
0.65
0.11
0.03
0.10
0.24
0.37
13,000
0.23
0.23
0.48
0.61
0.70
0.13
0.03
0.10
0.25
0.40
13,500
0.24
0.25
0.53
0.67
0.76
0.14
0.03
0.11
0.26
0.44
14,000
0.26
0.26
0.57
0.72
0.82
0.16
0.03
0.12
0.27
0.49
14,500
0.27
0.27
0.62
0.78
0.89
0.18
0.04
0.13
0.28
0.53
15,000
0.29
0.29
0.68
0.84
0.95
0.21
0.04
0.13
0.29
0.58
Page 10
BLOWER DATA
POWER EXHAUST PERFORMANCE - STANDARD STATIC
Return Duct Negative Static Pressure
Air Volume Exhausted
in. w.g.
cfm
0.00
12,800
0.05
12,200
0.10
11,500
0.15
10,800
0.20
9900
0.25
9000
0.30
7900
0.35
6750
0.40
5450
0.45
4150
0.50
2900
POWER EXHAUST - HIGH STATIC
Air Volume
cfm
8500
Return Duct Negative Static Pressure - In. w.g.
0
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.0
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 487 0.43 501 0.44 521 0.46 548 0.49 584 0.53 625 0.58 667 0.64 708 0.70 746 0.75 783 0.81 818 0.87
9000 9500 10,000 10,500 11,000 11,500 12,000
515 0.51 528 0.52 547 0.54 570 0.57 601 0.61 638 0.66 678 0.71 717 0.77 755 0.83 791 0.90 826 0.96 544 0.60 556 0.61 573 0.63 594 0.66 620 0.69 652 0.74 689 0.80 727 0.86 765 0.93 800 0.99 834 1.05 572 0.70 584 0.71 599 0.73 618 0.76 641 0.79 669 0.83 702 0.89 738 0.95 774 1.02 810 1.09 843 1.15 601 0.81 612 0.82 626 0.84 643 0.87 663 0.90 688 0.94 718 0.99 750 1.05 785 1.12 819 1.19 853 1.27 629 0.93 640 0.95 653 0.97 668 0.99 687 1.02 709 1.06 735 1.11 764 1.16 796 1.23 830 1.31 862 1.38 658 1.06 668 1.08 680 1.10 694 1.12 711 1.15 731 1.19 754 1.24 780 1.29 810 1.36 841 1.43 872 1.50 686 1.21 696 1.22 707 1.24 721 1.27 736 1.30 754 1.34 774 1.38 798 1.43 825 1.49 853 1.56 883 1.64
Page 11
BLOWER DATA
CEILING DIFFUSER AIR RESISTANCE - in. w.g.
Air Volume
cfm
2 Ends Open
Step-Down Diffuser LARTD30/36S
1 Side/2 Ends Open
7500
0.37
0.31
8000
0.42
0.36
8500
0.48
0.41
9000
0.55
0.47
9500
0.62
0.53
10,000
0.70
0.60
10,500
0.78
0.68
11,000
0.87
0.76
11,500
0.97
0.85
12,000
1.08
0.94
12,500
1.19
1.04
13,000
1.30
1.15
13,500
1.43
1.26
14,000
1.56
1.38
14,500
1.69
1.50
15,000
1.84
1.63
All Ends & Sides Open 0.25 0.29 0.34 0.39 0.45 0.51 0.58 0.65 0.73 0.82 0.91 1.00 1.10 1.20 1.31 1.43
Flush Diffuser
LAFD30/36S
0.29 0.34 0.39 0.44 0.51 0.57 0.65 0.72 0.81 0.9 0.99 1.10 1.20 1.31 1.43 1.56
CEILING DIFFUSER AIR THROW DATA - ft.
Air Volume cfm
1 Effective Throw Range - ft.
Step-Down
Flush
9000
40 - 47
29 - 35
9500
43 - 50
33 - 41
10,000
46 - 54
37 - 46
10,500
50 - 58
42 - 51
11,000
53 - 61
46 - 56
11,500
55 - 64
50 - 61
12,000
58 - 67
54 - 66
12,500
61 - 71
58 - 71
13,000
64 - 74
62 - 75
13,500
67 - 77
66 - 79
0 ft. per minute. Four sides open. Throw is the horizontal or vertical distance an airstream travels on leaving the outlet or diffuser before the maximum velocity is reduced to 5
Page 12
MINIMUM R454B SPACE AND CFM REQUIREMENTS
Unit
LCT/LGT302
Minimum Airflow Qmin(CFM) 178
Qmin(m³h)
303
LCT/LGT360
169
286
¹ NOTE - The minimum airflow is the lowest CFM allowed during venting operation (leak mitigation).
Minimum Room Area of Conditioned Space
Unit
LCT/LGT302
TAmin(ft²)
99
TAmin(m²)
9.19
LCT/LGT360
94
8.68
² NOTE - The minimum room area of conditioned space is the smallest
area the unit can service.
Refrigerant Charge R-454B
Unit
LGT/LCT302 Stage 1
Mc(lbs)
6.75
LGT/LCT302 Stage 2
6.50
LGT/LCT302 Stage 3
6.69
LGT/LCT302 Stage 4
6.81
LGT/LCT360 Stage 1
6.38
LGT/LCT360 Stage 2
6.81
LGT/LCT360 Stage 3
6.63
LGT/LCT360 Stage 4
6.38
Mc(kg)
3.06 2.95 3.03 3.09 2.89 3.09 3.01 2.89
Altitude Adjustment Factor
Halt
0
200
400
600
800
1000
1200
1400
1600
AF
1
1
1
1
1.02
1.05
1.04
1.1
1.12
Halt
1600
1800
2000
2200
2400
2600
2800
3000
3200
AF
1.12
1.15
1.18
1.21
1.25
1.28
1.32
1.36
1.4
³ NOTE - Use the Altitude Adjustment Factor to adjust the values in the tables above to different altitudes. Find the relevant altitude above sea level in the two "Halt" rows and then multiply the value needed from the tables above by the altitude factor number. Example: For the minimum airflow in CFM for an LCT/LGT302 at 1000 ft. above see level, multiply 178 by 1.05 to get 186.9 CFM as the new Qmin.
Page 13
ELECTRICAL DATA
Model
1 Voltage - 60Hz
208/230V - 3 Ph
Compressor 1
Rated Load Amps
22.4
Locked Rotor Amps
166.2
Compressor 2
Rated Load Amps
22.4
Locked Rotor Amps
166.2
Compressor 3
Rated Load Amps
22.4
Locked Rotor Amps
166.2
Compressor 4
Rated Load Amps
22.4
Locked Rotor Amps
166.2
Outdoor Fan
Full Load Amps (6 Non-ECM)
2.4
Motors (6)
Total
14.4
Standard Power Exhaust (3) 0.33 HP
Full Load Amps
2.4
Total
7.2
High Static Power Exhaust (3) 2 HP
Full Load Amps
7.5
Total
22.5
Service Outlet 115V GFI (amps)
15
Indoor Blower Motor
HP 5
7.5
10
Full Load Amps 16.7 24.2 30.8
2 Maximum Overcurrent Protection (MOCP)
Unit Only 150 150 150
With (3) 0.33 HP 150 150 175 Standard Power Exhaust
With High Static 150 175 175 Power Exhaust (3) 2 HP
3 Minimum Circuit Ampacity (MCA)
Unit Only 127 135 143
With (3) 0.33 HP 134 142 150 Standard Power Exhaust
With High Static 149 157 165 Power Exhaust (3) 2 HP
NOTE - All units have a minimum Short Circuit Current Rating (SCCR) of 5000 amps. Extremes of operating range are 0% plus and minus 1 of line voltage.
HACR type breaker or fuse.
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
LCT302H5M, LCT302H5V 460V - 3 Ph 9.1 74.6 9.1 74.6 9.1 74.6 9.1 74.6 1.3 7.8 1.3 3.9
3.4 10.2
15
5
7.5
10
7.6
11
14
60
60
70
60
70
70
70
70
80
55
58
62
58
62
66
65
69
72
25 TON
575V - 3 Ph 7.2 54 7.2 54 7.2 54 7.2 54 1 6 1 3
2.7 8.1
20
5
7.5
10
6.1
9
11
45
50
50
50
50
60
60
60
60
43
47
49
46
50
52
51
55
57
Page 14
ELECTRIC HEAT DATA
Model
LCT302H5M, LCT302H5V
25 TON
1 Voltage - 60Hz
208/230V - 3 Ph
460V - 3 Ph
575V - 3 Ph
Indoor Blower Motor - HP
5
7.5
10
5
7.5 10
5
7.5 10
Electric Heat Voltage 208V 240V 208V 240V 208V 240V 480V 480V 480V 600V 600V 600V
2 Maximum
Unit+ 30 kW 150 150 150 150 150 150 60 60 70 45 50 50
Overcurrent Electric Heat
Protection
45 kW 4 150 175 4 150 175 175 175 80 90 90 70 70 70
(MOCP)
60 kW 4 150 175 175 175 4 175 200 90 90 90 70 70 80
90 kW 4 225 250 4 225 250 4 250 4 300 125 125 150 100 100 110
3 Minimum Circuit Ampacity (MCA)
Unit+ 30 kW 127 127 135 135 143 143 55 59 63 44 48 50 Electric Heat
45 kW 139 157 148 166 156 174 78 82 86 62 66 68
60 kW 146 166 156 175 164 183 82 86 90 66 69 72
90 kW 209 238 218 247 227 256 118 123 126 95 98 101
2 Maximum
Unit+ 30 kW 150 150 150 150 175 175 60 70 70 50 60 60
Overcurrent Electric Heat
Protection
and Standard 45 kW 4 150 175 175 175 4 175 200 90 90 100 70 70 80
(MOCP)
Power Exhaust (3) 0.33 HP 60 kW 175 175 4 175 200 4 175 200 90 100 100 70 80 80
90 kW 4 225 250 4 250 4 300 4 250 4 300 125 150 150 100 110 110
3 Minimum
Unit+ 30 kW 134 134 142 142 150 150 60 64 68 48 52 54
Circuit
Electric Heat
Ampacity
and Standard 45 kW 148 166 157 175 165 183 83 87 91 66 70 72
(MCA)
Power Exhaust (3) 0.33 HP 60 kW 155 175 165 184 173 192 87 91 95 70 73 76
90 kW 218 247 227 256 236 265 123 127 131 98 102 105
2 Maximum
Unit+ 30 kW 150 150 175 175 175 175 70 80 80 60 60 60
Overcurrent Electric Heat
Protection and High Static 45 kW 4 175 200 200 200 4 200 225 90 100 100 80 80 80
(MOCP)
Power Exhaust (3) 2 HP 60 kW 4 175 200 4 200 225 4 200 225 100 100 110 80 80 90
90 kW 4 250 4 300 4 250 4 300 300 4 300 150 150 150 110 110 125
3 Minimum Circuit Ampacity (MCA)
Unit+ 30 kW 149 149 157 157 165 165 68 72 76 54 58 60 Electric Heat and High Static 45 kW 167 185 176 194 184 202 90 95 98 72 76 79 Power Exhaust
(3) 2 HP 60 kW 175 194 184 203 192 211 95 99 103 76 80 82
90 kW 237 266 247 275 255 284 131 135 139 105 108 111
Extremes of operating range are plus 0% and minus 1 of line voltage.
HACR type breaker or fuse.
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
Factory installed circuit breaker not available.
Page 15
ELECTRICAL DATA
Model
LCT360H5M, LCT360H5V
1 Voltage - 60Hz
208/230V - 3 Ph
460V - 3 Ph
Compressor 1
Rated Load Amps
30.9
12.8
Locked Rotor Amps
178.5
103
Compressor 2
Rated Load Amps
30.9
12.8
Locked Rotor Amps
178.5
103
Compressor 3
Rated Load Amps
30.9
12.8
Locked Rotor Amps
178.5
103
Compressor 4
Rated Load Amps
30.9
12.8
Locked Rotor Amps
178.5
103
Outdoor Fan
Full Load Amps (6 Non-ECM)
2.4
1.3
Motors (6)
Total
14.4
7.8
Standard
Full Load Amps
2.4
1.3
Power Exhaust (3) 0.33 HP
Total
7.2
3.9
High Static
Full Load Amps
7.5
3.4
Power Exhaust (3) 2 HP
Total
22.5
10.2
Service Outlet 115V GFI (amps)
15
15
Indoor Blower Motor
HP 5
7.5
10
5
7.5
10
Full Load Amps 16.7 24.2 30.8 7.6
11
14
2 Maximum Overcurrent Protection (MOCP)
Unit Only 175 200 200
80
80
90
With (3) 0.33 HP 200 200 200
80
80
90
Standard Power Exhaust
With High Static 200 200 225
90
Power Exhaust (3) 2 HP
90 100
3 Minimum Circuit Ampacity (MCA)
Unit Only 163 170 177
70
74
77
With (3) 0.33 HP 170 178 184
74
78
81
Standard Power Exhaust
With High Static 185 193 200
80
84
87
Power Exhaust (3) 2 HP
NOTE - All units have a minimum Short Circuit Current Rating (SCCR) of 5000 amps. Extremes of operating range are 0% plus and minus 1 of line voltage.
HACR type breaker or fuse.
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
30 TON
575V - 3 Ph 10.1 78 10.1 78 10.1 78 10.1 78 1 6 1 3
2.7 8.1
20
5
7.5
10
6.1
9
11
60
60
70
60
70
70
70
70
70
56
58
61
59
61
64
64
67
69
Page 16
ELECTRIC HEAT DATA
Model
LCT360H5M, LCT360H5V
30 TON
1 Voltage - 60Hz
208/230V - 3 Ph
460V - 3 Ph
575V - 3 Ph
Indoor Blower Motor - HP
5
7.5
10
5
7.5 10
5
7.5 10
Electric Heat Voltage 208V 240V 208V 240V 208V 240V 480V 480V 480V 600V 600V 600V
2 Maximum
Unit+ 30 kW 175 175 200 200 200 200 80 80 90 60 60 70
Overcurrent Electric Heat
Protection
45 kW 175 175 200 200 200 200 80 90 90 70 70 70
(MOCP)
60 kW 175 175 200 200 200 200 90 90 90 70 70 80
90 kW 4 225 250 4 225 250 4 250 4 300 125 125 150 100 100 110
3 Minimum Circuit Ampacity (MCA)
Unit+ 30 kW 163 163 170 170 177 177 70 74 77 56 58 61 Electric Heat
45 kW 163 163 170 170 177 177 78 82 86 62 66 68
60 kW 163 166 170 175 177 183 82 86 90 66 69 72
90 kW 209 238 218 247 227 256 118 123 126 95 98 101
2 Maximum
Unit+ 30 kW 200 200 200 200 200 200 80 80 90 60 70 70
Overcurrent Electric Heat
Protection
and Standard 45 kW 200 200 200 200 200 200 90 90 100 70 70 80
(MOCP)
Power Exhaust (3) 0.33 HP 60 kW 200 200 200 200 200 200 90 100 100 70 80 80
90 kW 4 225 250 4 250 4 300 4 250 4 300 125 150 150 100 110 110
3 Minimum Circuit Ampacity (MCA)
Unit+ 30 kW 170 170 178 178 184 184 74 78 81 59 61 64 Electric Heat and Standard 45 kW 170 170 178 178 184 184 83 87 91 66 70 72 Power Exhaust
(3) 0.33 HP 60 kW 170 175 178 184 184 192 87 91 95 70 73 76
90 kW 218 247 227 256 236 265 123 127 131 98 102 105
2 Maximum
Unit+ 30 kW 200 200 200 200 225 225 90 90 100 70 70 70
Overcurrent Electric Heat
Protection and High Static 45 kW 200 200 200 200 225 225 90 100 100 80 80 80
(MOCP)
Power Exhaust (3) 2 HP 60 kW 200 200 4 200 225 225 225 100 100 110 80 80 90
90 kW 4 250 4 300 4 250 4 300 300 4 300 150 150 150 110 110 125
3 Minimum Circuit Ampacity (MCA)
Unit+ 30 kW 185 185 193 193 200 200 80 84 87 64 67 69 Electric Heat and High Static 45 kW 185 185 193 194 200 202 90 95 98 72 76 79 Power Exhaust
(3) 2 HP 60 kW 185 194 193 203 200 211 95 99 103 76 80 82
90 kW 237 266 247 275 255 284 131 135 139 105 108 111
Extremes of operating range are plus 0% and minus 1 of line voltage.
HACR type breaker or fuse.
Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
Factory installed circuit breaker not available.
Page 17
ELECTRIC HEAT CAPACITIES
Volts Input
30 kW
kW Input
Btuh Output
45 kW
Stages
kW Input
Btuh Output
208
22.5 76,800
1
33.8 115,300
220
25.2 86,000
1
37.8 129,000
230
27.5 93,900
1
41.3 141,000
240
30.0 102,400 1
45.0 153,600
440
25.2 86,000
1
37.8 129,000
460
27.5 93,900
1
41.3 141,000
480
30.0 102,400 1
45.0 153,600
550
25.2 86,000
1
37.8 129,000
575
27.5 93,900
1
41.3 141,000
600
30.0 102,400 1
45.0 153,600
60 kW
Stages
kW Input
Btuh Output
2
45.0 153,600
2
50.4 172,000
2
55.1 188,000
2
60.0 204,800
2
50.4 172,000
2
55.1 188,000
2
60.0 204,800
2
50.4 172,000
2
55.1 188,000
2
60.0 204,800
90 kW
Stages
kW Input
Btuh Output
2
67.6 230,700
2
75.6 258,000
2
82.7 282,200
2
90.0 307,100
2
75.6 258,000
2
82.7 282,200
2
90.0 307,100
2
75.6 258,000
2
82.7 282,200
2
90.0 307,100
Stages
2 2 2 2 2 2 2 2 2 2
Page 18
PARTS ARRANGEMENT
BLOWERS
FILTERS
EVAPORATOR
(TWELVE - 20 X 20 X 2") COIL
ECONOMIZER DAMPERS (OPTIONAL)
BLOWER MOTOR
REHEAT COIL
BLOWER INVERTER
UNIT CONTROLLER
4
8.8.8.8
3
1
2
CONDENSATE DRAIN
DISCONNECT (FACTORY-INSTALLED
OPTION)
ELECTRIC HEAT
FIGURE 1
CONDENSER FANS (6)
CONDENSER COILS
COMPRESSORS
Page 19
CONTROL BOX
TB13
K203
F10
K2 K146
C20 K150
A55
A178
T1
T18
A96
K202
K3
S42 K1 K14
K65
C19
K152 K10
T3 A173
A3
K262
TB25 T13 T49
A12 K9 or K125
LGT ONLY A3 CONTROL, BURNER 1 LGT ONLY A12 CONTROL, BURNER 2
A55 CONTROL, M4 A178 CONTROL, C4
A96 CONTROL INVERTER, BLOWER
A173 CONTROL, SMOKE DETECTOR
C1 CAPACITOR, OUTDOOR FAN 1 C2 CAPACITOR, OUTDOOR FAN 2 C18 CAPACITOR, OUTDOOR FAN 3 C19 CAPACITOR, OUTDOOR FAN 4 C20 CAPACITOR, OUTDOOR FAN 5 C21 CAPACITOR, OUTDOOR FAN 6
F6
FUSE, EXHAUST FAN
F10 FUSE, COMPONENT
K1 K2 K14 K146
CONTACTOR, COMPRESSOR 1 CONTACTOR, COMPRESSOR 2 CONTACTOR, COMPRESSOR 3 CONTACTOR, COMPRESSOR 4
FIGURE 2 Page 20
C1 C2 C18
K231 F6 C21 K153 K149 K68
K3
CONTACTOR, BLOWER
LCT ONLY K9 RELAY, ELECTRIC HEAT
K10 K68 K149 K150 K252 K153
RELAY, OUTDOOR FAN 1 RELAY, OUTDOOR FAN 2 RELAY, OUTDOOR FAN 3 RELAY, OUTDOOR FAN 4 RELAY, OUTDOOR FAN 5 RELAY, OUTDOOR FAN 6
K65 RELAY, EXHAUST FAN K231 RELAY, EXHAUST FAN 2
LGT FIELD INSTALLED K125 RELAY, LO W TEMP VEST HEATER 1 LGT FIELD INSTALLED K262 RELAY, LOW TEMP VEST HEATER 2
K202 CONTACTOR, INVERTER K203 RELAY, INVERTER CONTROL
S42 OVERLOAD PROTECTOR, BLOWER MOTOR
T1
LGT ONLY T3 LGT ONLY T13
T18
TRANSFORMER, CONTROL TRANSFORMER, COMBUSTION AIR BLOWER 1 TRANSFORMER, COMBUSTION AIR BLOWER 2 TRANSFORMER, CONTACTOR
T49 TRANSFORMER, UV
TB13 TERMINAL STRIP, POWER DISTRIBUTION TB25 TERMINAL STRIP,BLOWER
I-UNIT COMPONENTS
ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic components. Take precautions to neutralize electrostatic charge by touching your hand and tools to metal prior to handling the control.
Units are configure to order units (CTO). Unit components are shown in .FIGURE 1. All units come standard with hinged unit panels. The unit panels may be held open with the door rod located inside the unit. All L1, L2, and L3 wiring is color coded; L1 is red, L2 is yellow, and L3 is blue.
A-Control Box Components
Control box components are shown in FIGURE 2, The control box is located in the upper left portion of the compressor compartment.
1-Disconnect Switch S48 (Optional all units)
All units may be equipped with an optional disconnect switch S48. Other factory or field installed optional circuit breakers may be used, such as CB10. S48 and CB10 are toggle or twist-style switches, which can be used by the service technician to disconnect power to the unit.
2-Transformer T1 (all units)
All units use a single line voltage to 24VAC transformer mounted in the control box. Transformer supplies power to control circuits in the unit. The transformer is rated at 70VA and is protected by a 3.5 amp circuit breaker (CB8). The 208/230 (Y) voltage transformers use two primary voltage taps as shown in figure 3, while 460 (G) and 575 (J) voltage transformers use a single primary voltage tap.
208/230V TRANSFORMER
BLUE
YELLOW
SECONDARY
208 VOLTS
RED 230 VOLTS
ORANGE PRIMARY BLACK
FIGURE 3
3-Transformer T18
T18 is a single line voltage to 24VAC transformer used in all units. Transformer T18 is protected by a 3.5 amp circuit breaker (CB18). T18 is identical to transformer T1. The transformer supplies 24VAC power to the contactors.
4-C. A. B. Transformers T3 & T13 (575V)
All LCT 575 (J) voltage units use transformer T3 and T13. The auto voltage to 230VAC transformers are located in the control box. The transformers have an output rating of 0.75A. T3 transformer supplies 230VAC power to combustion air blower motor (B6) while T13 transformer supplies power to combustion air blower motor (B15) in all units. T3 and T13 also provide 230VAC to optional ultraviolet germicidal (UVC) lamps.
5-Terminal Block TB13
TB13 terminal block distributes line voltage power to the line voltage items in the unit.
6-Terminal Block TB2
When unit is not equipped with an optional S48 disconnect switch, supply power is connected to TB2.
7-Outdoor Fan Motor Fuse Block & Fuses F10 and Power Exhaust Fan Motor Fuse Block and Fuses F6 (240 & 300 Y Volt Only)
Three line voltage fuses, F10, provide overcurrent protection to all condenser fans. Two line voltage fuses, F6, provide overcurrent protection to the two optional power exhaust fans. The fuses are rated at 30A in 208/230V units.
8-Fuses F4
Fuse F4 is used only with single point power supply. F4 provides overcurrent protection to the compressor and other cooling components.
Note - F4, S48 and TB2 are located inside a sheet metal enclosure in the unit front left corner mullion.
9-Outdoor Fan Capacitors C1, C2, C18, C19,C20, C21
Fan capacitors C1, C2, C18, C19, C20 and C21 are 370V / 10 MFD capacitors used to assist in the start up of condenser fans B4, B5, B21, B22, B23 and B24. respectively.
10-Compressor Contactors K1, K2, K14, K146
All compressor contactors are three pole double break contactors with a 24VAC coil. In all units, K1, K2, K14 and K146 energize compressors B1, B2, B13, and B20 respectively. ELECTRIC HEAT CONTROL SECTION
(30 - 90 kW electric heat only)
11-Electric Heat Relay K9
All unit equipped with optional electric heat use an electric heat relay K9. K9 is a N.O. SPST pilot relay intended to electrically interlock operation of left and right side electric heat sections. K9 is energized by the A55 Unit Controller.
Page 21
12-Blower Contactor K3
Blower contactor K3, is a three-pole-double-break contactor with a 24VAC coil used to energize the indoor blower motor B3 in response to blower demand.
13-Outdoor Fan Relay K10, K68, K149, K150, K152, K153
Outdoor fan relays K10, K68, K149, K150, K152 and K153 used in all units, are DPDT relays with a 24VAC coil. In all units, K10 energizes fan 1 (B4), K68 energizes fan 2 (B5), K149 energizes fan 3 (B21), K150 energizes fan 4 (B22), K152 energizes fan 5 (B23) and K153 energizes fan 6 (B24).
14-Power Exhaust Relay K65 (PEF units)
Power exhaust relay K65 is a N.O. DPDT relay with a 24VAC coil. K65 is used in all units equipped with optional power exhaust fans. K65 is energized by the Unit Controller (A55).
15-Blower Motor Overload Relay S42
The blower motor overload relay is used in all units equipped with M-volt unit blower motors manufactured before Dec. 19, 2010 as well as units with standard efficiency motors of 10 HP. The relay (S42) is connected in line with the blower motor to monitor the current flow to the motor. When the relay senses an overload condition, a set of normally closed contacts open to de-energize pin #4 in plug P299 of the A55 Unit Controller. A55 de-energizes all outputs. Units will be equipped with a relay manufactured by Telemecanique figure 4 or Siemens figure 5.
16-Ultraviolet Germicidal Lamp (UVC) and Transformer T49
UVC transformer T49 is used by units of all voltages except 208/230V. 575V LCT which are equipped with a UVC. The auto voltage to 230VAC transformer is installed in the control box. The transformer has an output rating of 0.75 amps. T49 transformer supplies 230VAC power to the UVC lamp.
17-Unit Controller A55 (all units)
The Unit Controller provides all unit control functions, unit status information, unit diagnostics, programmable parameters and USB verification and profile sharing. Refer to the Unit Controller guide provided with the unit. Thermostat wires are connected to J297 on the Unit Controller
.
TRIP INDICATION
WINDOW
AMP SETTING POINTER
AMP SETTING CONTROL
(BLUE DIAL)
LINE VOLTAGE IN
TELEMECANIQUE OVERLOAD RELAY
CLEAR COVER (SHOWN CLOSED)
STOP BUTTON
(RED)
DETAIL SHOWING RESET BUTTON ADJUSTED TO MANUAL POSITION
Lift clear cover and turn adjustment screw counterclockwise. Reset screw will pop out when pointer is in M (manual position). Close
cover to lock reset screw into position.
RED TEST
BUTTON
(Push To Test)
BLUE RESET SCREW
(Shown in AUTO position as
LOAD VOLTAGE
shipped from the factory)
OUT Lift clear cover to adjust relay amp setting according to value given on the blower motor nameplate. Proper relay
amp setting equals motor nameplate FLA X service factor of 1.15 X .95.
Cover must also be lifted to adjust control mode from automatic reset to manual reset (see detail above) and to
test the control.
ton. A yellow marker should appear in the trip indication window to the right of the amp setting control. Press the blue reset screw to reset the relay.
The red STOP button opens the normally closed contacts which power the blower motor. This button stops blower motor operation as long as it is pressed in.
FIGURE 4
SIEMENS OVERLOAD RELAY
BLUE RESET BUTTON IN FACTORY-SET AUTO MODE
(Turn clockwise to H for manual reset)
GREEN TRIP INDICATOR (Flush with surface -- not tripped;
Above surface -- tripped)
TON
AMP ADJUSTMENT DIAL Adjust relay amp setting according to value given on the blower motor nameplate. Proper relay amp setting equals
motor nameplate FLA X service factor of 1.15 X .95. Use small slotted screwdriver to adjust control mode from automatic reset (A) to manual reset (H). Control must be in the manual reset mode (H) to perform a test. Press the red test button. Green trip indicator
should pop out. Press the blue reset screw to reset the relay.
FIGURE 5
18-Compressor 3 & 4 Control Module A178 (all units)
The compressor 3 & 4 control module A178 controls two additional compressor stages. A178 includes all inputs and outputs required for compressor and fan control, compressor stage diagnostics, and low ambient control.
Page 22
Relative Humidity Sensor - Optional
Economizer Differential Pressure Sensor - Optional
The indoor relative humidity sensor (A91) is an analog sensor with a 0-10VDC output over a relative humidity range of 0-100% relative humidity. The sensor is powered with 24VAC.
Enthalpy Sensor - Optional
Rooftop units installed with Smart AirflowTM will have a Pressure Transducer (PT5) present in the economizer. PT5 requires 5VDC power supply (P266-5 and {P2666) and gives 0.25 VDC to 4 VDC output (P266-4) corresponding to 0" water column and 2" water column respectively. For all practical purposes the output should be less
The optional enthalpy sensors (A7 and A63) used with the economizer have an output of 4-20mA. The sensor is powered with 18VAC provided by M3 unit control.
than 1.2" water column if not an error code is stored and service alarm output is turned on.
Temperature Sensors
The return air (RT16) and discharge air (RT6) duct probes and the outdoor air (RT17) are all two wire thermistors. The resistance vs. temperature table is shown below:
TABLE 1
Resistance vs. Temperature
Temp. °F (°C)
Resistance +/-2%
Temperature °F (°C)
Resistance +/-2%
Temp. °F (°C)
Resistance +/-2%
-40 (-40)
335,671
40 (4.4)
26,106
90 (32.2)
7,332
-20 (-28.9)
164,959
50 (10)
19,904
100 (37.8)
5,826
0 (-17.8)
85,323
60 (15.6)
15,313
120 (48.9)
3,756
20 (-6.7)
46,218
70 (21.1)
11,884
130 (54.4)
3,047
30 (-1.1)
34,566
80 (26.7)
9,298
Room Sensors Room sensor (A2) is a two-wire thermistor with 1k series resistor.
Temp. °F (°C) 40 (4.4) 45 (7.2) 50 (10) 55 (12.8)
Resistance +/-2% 27,102 23,764 20,898 18,433
TABLE 2
Two-Wire Thermistor
Temperature °F (°C)
Resistance +/-2%
60 (15.6)
16,313
65 (18.3)
14,474
70 (21.1)
12,882
75 (23.9)
11,498
Temp. °F (°C) 80 (26.7) 85 (29.4) 90 (32.2)
Resistance +/-2% 10,299 9,249 8,529
Carbon Dioxide Sensor
The indoor carbon dioxide sensor (A63) is an analog sensor with a 0-10VDC output over a carbon dioxide range of 0-2000 ppm as shown in the following table. The sensor is powered with 24VAC.
Carbon Dioxide PPM 0 200 400
DC Voltage
0 1 2
Carbon Dioxide PPM 600 800 1000
TABLE 3
Carbon Dioxide Range
DC Voltage
Carbon Dioxide PPM
3
1200
4
1400
5
1600
DC Voltage
6 7 8
Carbon Dioxide PPM
1800
2000
DC Voltage
9 10
VAV Supply Static Sensor
The supply duct differential static pressure sensor (A30) is an analog sensor with a 0-10VDC output over a range of 0-5"w.c as shown in the following table. The sensor is powered with 24VAC.
Pressure "w.c. 0 0.5 1
DC Voltage 0 1 2
Pressure "w.c. 1.5 2 2.5
TABLE 4
Carbon Dioxide Range
DC Voltage Pressure "w.c.
3
3
4
3.5
5
4
DC Voltage 6 7 8
Pressure "w.c. 4.5 5
DC Voltage 9 10
Page 23
LIQUID LINES (4)
CIRCUIT 4 (S96)
CIRCUIT 2 (S88)
CIRCUIT 3
(S98)
CIRCUIT 4
(S97)
CIRCUIT 3 (S28)
CIRCUIT 2 (S7)
CIRCUIT 1 (S4)
CIRCUIT 1
DISCHARGE LINE
DISCHARGE PRESSURE TAP
LOW PRESSURE SWITCH (S87)
SUCTION PRESSURE TAP
SUCTION LINE
FIGURE 6 Page 24
B-Cooling Components FIGURE 6
All units use independent cooling circuits consisting of separate compressors, condenser coils and evaporator coils. Six draw-through type condenser fans are used in all units. All units are equipped with belt-drive blowers which draw air across the evaporator during unit operation.
Cooling may be supplemented by a factory- or field-installed economizer. The evaporators are slab type and are stacked. Each evaporator uses a thermostatic expansion valve as the primary expansion device. Each evaporator is also equipped with enhanced fins and rifled tubing. In all units each compressor is protected by a crankcase heater, high pressure switch and low pressure switch. Additional protection is provided by low ambient switches and freezestats (on each evaporator).
1-Compressors B1, B2, B13, B20
WARNING
Electrical shock hazard. Compressor must be grounded. Do not operate without protective coverover terminals. Disconnect power before removing protective cover. Discharge capacitors before servicing unit. Failure to follow these precautions could cause electrical shock resulting in injury or death.
All units use four scroll compressors. Compressor capacity may vary from stage to stage. In all cases, the capacity of each compressor is added to reach the tota capacity of the unit. Compressor electrical specifications can be found in the SPECIFICATIONS section in this manual. Each compressor is energized by a corresponding compressor contactor.
NOTE-Refer to the wiring diagram section for specific unit operation.
If a compressor replacement is necessary, call 1-800-4536669.
IMPORTANT
Some scroll compressors have an internal vacuum protector that will unload scrolls when suction pressure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded. Protector will reset when low pressure in system rises above 40 psig. DO NOT REPLACE COMPRESSOR.
2-Crankcase Heaters HR1, HR2, HR5, HR11
All units use bellyband-type crankcase heaters. Heater HR1 is installed around compressor B1, heater HR2 compressor B2, HR5 compressor B13, and HR11 compressor B20. Crankcase heater wattage varies by compressor size.
3-High Pressure Switches S4, S7, S28, S96
The high pressure switch is an auto-reset SPST N.C. switch which opens on a pressure rise. All units are equipped with this switch. The switch is located in the liquid line and is wired in series with the compressor contactor coil through A55 Unit Controller or A178 Compressor 3 and 4 Controller. S4 (first circuit), S7 (second circuit), S28 (third circuit), and S96 (fourth circuit) are wired in series with the respective compressor contactor coils.
When liquid pressure rises to 610 ± 15 psig (4206 ± 103 kPa) (indicating a problem in the system) the switch opens and the respective compressor is de-energized (the economizer can continue to operate). When liquid pressure drops to 475 ± 15 psig (3275 ± 103 kPa) the pressure switch will close.
Unit Controller A55 has a three-strike counter before locking out the particular compressor circuit. This means the control allows three high pressure trips per one thermostat demand. The control can be reset by breaking and remaking the thermostat demand or manually resetting the control.
Page 25
5-Low Pressure Switches S87, S88, S98, S97
The low pressure switch is an auto-reset SPST N.O. switch (held N.C. by refrigerant pressure) which opens on a pressure drop. All units are equipped with this switch. The switch is located in the compressor suction line. S87 (compressor one), S88 (compressor two), S98 (compressor three), and S97 (compressor four) are wired in series with the contactor coils through the A55 Unit Controller.
The Unit Controller A55 governs the low pressure switches by shunting the switches during start up until pressure is stabilized. After the shunt period, the control has a threestrike counter, during first thermostat demand, before the compressor is locked out. The control is reset by breaking and remaking the thermostat demand or manually resetting the control. When suction pressure drops to 40 + 5 psig (276 ± 34 kPa) (indicating low pressure), the switch opens and the compressor is de-energized. The switch automatically resets when pressure in the suction line rises to 90 + 5 psig (620 ± 34 kPa), due to many causes such as refrigerant being added.
6-Filter Drier (all units)
All units have a filter drier located in the liquid line of each refrigerant circuit at the exit of each condenser coil. The drier removes contaminants and moisture from the system.
7-Condenser Fans B4, B5, B21, B22, B23, B24
See Specifications section in this manual for specifications of condenser fans. All condenser fans used have singlephase motors. All units are equipped with six condenser fans. The complete fan assembly may be removed for servicing and cleaning by removing the fan grill and turning the complete assembly until the motor brackets line up with the notches in the top panel. Lift the fan assembly out of the unit and disconnect the jack plug located on the motor.
VARIABLE AND STAGED SUPPLY AIR UNIT REFRIGERANT CIRCUITS
CIRCUIT 4 CIRCUIT 3
EVAPORATOR COIL EVAPORATOR COIL
FIGURE 7
CONDENSER COIL
CONDENSER COIL
Page 26
8-Diagnostic Sensors
Units are equipped with factory-installed thermistors located on different points on the refrigerant circuit.
The thermistors provide the Unit Controller with constant temperature readings of two specific locations on the refrigeration circuit. These temperatures are used as feedback in certain modes of unit operation.
In addition, the Unit Controller uses these temperatures to initiate alarms such as loss of condenser or evaporator airflow and loss of charge.
Each thermistor must be specifically placed for proper unit operation and to initiate valid alarms. See FIGURE 8 (RT46, RT47, RT50, RT51) and FIGURE 9 (RT48, RT49, RT52, RT53) for proper locations.
LGT/LCT302, 360 EVAPORATOR COIL
(RT46, 47, 50, 51)
LGT/LCT302, 360 CONDENSER COIL
RT48, 49, 52, 53
22J06
BLUE
RT47
22J06
GREEN
RT51
22J06
YELLOW
RT46
22J06
RED
RT50
FIGURE 8
23V50 BLUE RT49
SEE DETAIL F
23V50
YELLOW
RT48
SEE DETAIL G
(Rear View)
23V50
GREEN RT53
SEE DETAIL I
23V50 RED RT52
SEE DETAIL H DETAILS NOT TO SCALE
FIGURE 9
Page 27
9-RDS Sensors
Units are equipped with factory-installed RDS Sensors located on different points on the unit. The RDS sensors provide the Unit Controller with continuous readings for leaked refrigerant concentration levels and sensor health status (Good or Fault). These readings are used to modify unit operation to disperse the leaked refrigerant and to remove possible ignition sources.
In addition, the Unit Controller uses these readings to initiate alarms to alert the operator of a refrigerant leak or faulty sensor(s).
Each sensor must be specifically placed for proper unit operation and to initiate valid alarms. See FIGURE 10 and FIGURE 11 for sensor locations.
LGT/LCT302-360 INDOOR COMPARTMENT RDS SENSOR
FIGURE 10
LGT/LCT 302-360 COMPRESSOR RDS SENSOR
FIGURE 11 Page 28
C-Bower Compartment
The blower compartment in all units is located between the evaporator coil and the compressor / control section on the opposite side of the condenser coil. The blower assembly is accessed by disconnecting the blower motor wiring (and all other plugs) and removing the screws on either side of the sliding base. The base pulls out as shown in FIGURE 12.
1-Blower Wheels (all units)
All units have two 18 in. x 15 in. (457 mm x 381 mm) blower wheels. Both wheels are driven by one motor.
2-Indoor Blower Motor B3 (all units)
All units use three-phase single-speed blower motors. CFM adjustments are made by adjusting the motor pulley (sheave). Motors are equipped with sealed ball bearings. All motor specifications are listed in the SPECIFICATIONS section in this manual. Units may be equipped with motors manufactured by various manufacturers, therefore electrical FLA and LRA specifications will vary. See unit rating plate for information specific to your unit.
A-Blower Operation
NOTE-The following is a generalized procedure and does not apply to all thermostat control systems.
1 - Blower operation is dependent on the thermostat control system option that has been installed in the units. Refer to operation sequence of the control system installed for detailed descriptions of blower operation.
2 - Generally, blower operation is set at the thermostat fan switch. With the fan switch in "ON" position and the OCP input is "ON", the blower operates continuously. With the fan switch in "AUTO" position, the blower cycles with demand.
3 - In most cases, the blower and entire unit will be off when the system switch is in the "OFF" position. The only exception is immediately after a heating demand when the blower control keeps the blower on until all heat is extracted from the heat exchanger.
B-Blower Access
1 - Disconnect wiring connected to heating limit switches and mixed air sensor in units with an economizer. Disconnect blower harness at K3 contactor (CAV) or A96 inverter (VAV/Staged). Failure to do so could damage harness or components.
2 - Remove screws on either side of blower assembly sliding base. See FIGURE 12.
3 - Pull base toward outside of unit
C-Determining Unit CFM
IMPORTANT - Multi-staged supply air units are factoryset to run the blower at full speed when there is a blower (G) demand without a heating or cooling demand. Refer to the field-provided, design specified CFM for all modes of operation. Use the following procedure to adjust motor pulley to deliver the highest CFM called for in the design spec. See Inverter Start-Up section to set blower CFM for all modes once the motor pulley is set.
Variable Air Volume Units - Refer to the Variable Air Volume Start-Up section.
1 - The following measurements must be made with a dry indoor coil. Run blower (G demand) without a cooling demand. Measure the indoor blower shaft RPM. Air filters must be in place when measurements are taken.
2 - With all access panels in place, measure static pressure external to unit (from supply to return). Blower performance data is based on static pressure readings taken in locations shown in FIGURE 13.
NOTE - Static pressure readings can vary if not taken where shown.
3 - See "BLOWER DATA" section (table of contents) to use static pressure and RPM readings to determine unit CFM, and when installing units with any of the optional accessories listed.
4 - The blower RPM can be adjusted at the motor pulley. Loosen Allen screw and turn adjustable pulley clockwise to increase CFM. Turn counterclockwise to decrease CFM. See FIGURE 12 . Do not exceed minimum and maximum number of pulley turns as shown in TABLE 5.
TABLE 5
Belt
Min. Turns Open
Max. Turns Open
A Section
No minimum
5
B Section
1*
6
*No minimum number of turns open when B belt is used on pulleys 6" O.D. or larger.
Page 29
TO INCREASE CFM
LOOSEN ALLEN SCREW & TURN PULLEY CLOCKWISE
TO DECREASE CFM
TURN PULLEY COUNTERCLOCKWISE
BLOWER ASSEMBLY SLIDING BASE
LOOSEN (4) SCREWS TO ADJUST BELT TENSION
SIDE VIEW
BLOWER ASSEMBLY
BELT TENSION ADJUSTING SCREW
BLOWER MOTOR
TO INCREASE BELT TENSION 1-Loosen four screws securing blower motor to
sliding base.
clockwise, to move the motor downward and tighten the belt. 3-Tighten four screws.
BLOWER WHEEL
PULLEY
MOTOR
ALLEN SCREW
PULLEY
FIGURE 12
REMOVE SCREWS TO SLIDE BLOWER
ASSEMBLY OUT OF UNIT
LOCATION OF STATIC PRESSURE READINGS
INSTALLATIONS WITH DUCTWORK
INSTALLATIONS WITH CEILING DIFFUSERS
ROOFTOP UNIT
ROOFTOP UNIT
SUPPLY TURN
MAIN DUCT RUN
RETURN AIR READING LOCATION
FIRST BRANCH OFF OF MAIN RUN
SUPPLY AIR READING LOCATION
SUPPLY AIR READING LOCATION
SUPPLY TURN
RETURN AIR READING LOCATION
DIFFUSER
FIGURE 13
Page 30
D-Blower Belt Adjustment
Maximum life and wear can be obtained from belts only if proper pulley alignment and belt tension are maintained. Tension new belts after a 24-48 hour period of operation. This will allow belt to stretch and seat into pulley grooves. Make sure blower and motor pulley are aligned. See FIGURE 14.
1 - Loosen four screws securing blower motor to sliding base. See FIGURE 12.
2 - To increase belt tension -
Turn belt tension adjusting screw to the left, or counterclockwise, to tighten the belt. This increases the distance between the blower motor and the blower housing. To loosen belt tension Turn the adjusting screw to the right, or clockwise to loosen belt tension. 3 - Tighten four screws securing blower motor to sliding base once adjustments have been made.
PULLEY ALIGNMENT
ALIGNED
E-Check Belt Tension
Overtensioning belts shortens belt and bearing life. Check belt tension as follows:
1 - Measure span length X. See FIGURE 15.
2 - Apply perpendicular force to center of span (X) with enough pressure to deflect belt 1/64" for every inch of span length or 1.5mm per 100mm of span length.
Example: Deflection distance of a 40" span would be 40/64" or 5/8". Example: Deflection distance of a 400mm span would be 6mm. 3 - Measure belt deflection force. For a used belt, the deflection force should be 5 lbs. (35kPa) . A new belt deflection force should be 7 lbs. (48kPa). A force below these values indicates and undertensioned belt. A force above these values indicates an overtensioned belt.
MEASURE BELT TENSION
MOTOR PULLEY
BELT
BLOWER PULLEY
NOT ALIGNED
FIGURE 14
FORCE
DEFLECTION 1/64" PER INCH OF SPAN OR 1.5mm PER 100mm OF SPAN
FIGURE 15 F-Field-Furnished Blower Drives For field furnished blower drives, see BLOWER DATA (table of contents) for CFM and RPM. The BLOWER DATA section also has tables for drive numbers and manufacturer's model numbers. Reference the manufacturer's model numbers in the table below..
Drive No.
1 2 3 4 5 6 7 8 9
ADJUSTABLE SHEAVE
Supplier No. OEM Part No.
1VP71x1-3/8 100239-06
1VP71x1-1/8 100239-06
1VP65x1-3/8
78M7101
1VP60x1-3/8
78L5501
1VP56x1-1/8
P-8-1492
1VP60x1-1/8
41C1301
1VP50x1-1/8
P-8-1977
1VP44x1-1/8
36C0701
1VP44x1-1/8
36C0701
MANUFACTURER'S NUMBERS (60 HZ)
DRIVE COMPONENTS
FIXED SHEAVE
BELTS
Supplier No. OEM Part No. Supplier No. OEM Part No.
BK140H
100788-13
BX78
100245-44
BK120H
100788-07
BX75
31K9801
BK130H
100788-08
BX75
31K9801
BK110H
100788-06
BX71
31K9701
BK120H
100788-07
BX71
31K9701
BK110H
100788-06
BX70
31K9601
BK120H
100788-07
BX70
31K9601
BK120H
100788-07
BX70
31K9601
BK140H
100788-13
BX73
100245-41
SPLIT BUSHING
Supplier No. OEM Part No.
H - 1-3/16
105616-02
H - 1-3/16
105616-02
H - 1-3/16
105616-02
H - 1-3/16
105616-02
H - 1-3/16
105616-02
H - 1-3/16
105616-02
H - 1-3/16
105616-02
H - 1-3/16
105616-02
H - 1-3/16
105616-02
Page 31
E-Optional Electric Heat Components
See ELECTRICAL/ELECTRIC HEAT DATA tables for possible LCT match-ups and electrical ratings.
EHA parts arrangement is shown in figures 27 and 28. All electric heat sections consist of electric heating elements exposed directly to the air stream. Two electric heat sections (first section and second section) are used in all 30kW through 120kW heaters. See figure 29. Multiple-stage elements are sequenced on and off in response to thermostat demand.
1-Main Control Box Components A55, K9, A178
The main control box (see figure 2) houses the A55, A178 Unit Controller and the K9 electric heat relay. For a description of the components see section I-A.
2-Terminal Block TB3
Electric heat line voltage connections are made to terminal block TB3 (or a fuse block on some models) located in the upper left corner of the electric heat vestibule.
3-Contactors K15, K16, K17 and K18
Contactors K15, K16, K17 and K18 are all three-pole double-break contactors located on the electric heat vestibule. K15 and K16 are located on the first electric heat section, while K17 and K18 are located on the second electric heat section. However, in the 30kW heaters, the first section houses all contactors and fuses. All contactors are equipped with a 24VAC coil. Contactors K15 and K17 energize the first stage heating elements, while K16 and K18 energize the second stage heating elements.
4-High Temperature Limits S15 and S107 (Primary)
S15 and S107 are SPST N.C. auto-reset thermostats located on the back panel of the electric heat section below the heating elements. S15 is the high temperature limit for the first electric heat section, while S107 is the high temperature limit for the second electric heat section. Both thermostats are identical and are wired to the A55 Unit Controller. When either S15 or S107 opens, indicating a problem in the system, contactor K15 is de-energized. When K15 is de-energized, first stage and all subsequent stages of heat are de-energized. The thermostats used on EHA360-45-2 Y/G/J volt are factory set to open at 200F + 5F (93.3 C + 2.8C) on a temperature rise and automatically reset at 160F + 6F (71.14C + 3.3C) on a temperature fall. All other electric heat sections thermostats are factory-set to open at 170F + 5F (76.7C + 2.8C) on a temperature rise and automatically reset at 13F + 6F (54.4C + 3.3C) on a temperature fall. The thermostats are not adjustable.
5-Heating Elements HE1 through HE14
Heating elements are composed of helix wound bare nichrome wire exposed directly to the air stream. Three elements are connected in a three-phase arrangement. The elements in 208/230V units are connected in a "Delta" arrangement. Elements in 460 and 575V units are connected in "Wye" arrangement. See EHA wiring diagram in WIRING DIAGRAM AND OPERATION SEQUENCE section in back of this manual. Each stage is energized independently by the corresponding contactors located on the electric heat vestibule panel. Once energized, heat transfer is instantaneous. High temperature protection is provided by primary and redundant high temperature limits and overcurrent protection is provided by fuses.
6-Fuse F3
Fuse F3 are housed in a fuse block which holds three fuses. Each F3 fuse is connected in series with each leg of electric heat. Figure 28 and table 7 show the fuses used with each electric heat section. For simplicity, the service manual labels the fuses F3 - 1 through F3 - 8.
ELECTRIC HEAT SECTION PARTS ARRANGEMENT
HEATING ELEMENTS HE1 - HE14
ELECTRIC HEAT VESTIBULE
CONTROL WIRE HARNESS
TRIC HEAT LIMIT S15(1ST SECTION) S107(2nd SECTION)
FIGURE 16
Page 32
TERMINAL STRIP (TB3)
ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT FIRST HEAT SECTION (LEFT SIDE)
ACCESS DOOR
FUSE F3 F3 - 1
FUSE F3 F3 - 2
FIRST STAGE ELECTRIC HEAT CONTACTOR K15
SECOND STAGE ELECTRIC HEAT CONTACTOR K16
FUSE F3 F3 - 3
FUSE F3 F3 - 4
TERMINAL STRIP (TB3)
SECOND HEAT SECTION (RIGHT SIDE)
ACCESS DOOR
FUSE F3 F3 - 5
FUSE F3 F3 - 6
FIRST STAGE ELECTRIC HEAT CONTACTOR K17
SECOND STAGE ELECTRIC HEAT CONTACTOR K18
FIGURE 17
FUSE F3 F3 - 7
FUSE F3 F3 - 8
Page 33
HEAT SECTION PLACEMENT
COMPRESSOR COMPARTMENT
SECOND ELECTRIC HEAT SECTION (RIGHT SIDE)
FIRST ELECTRIC HEAT SECTION
(LEFT SIDE)
FIGURE 18
EHA QUANTITY & SIZE
(1) EHA360-15 & (1) EHA360S-15
(30 kW Total) or
(1) EHA156-15 & (1) EHA156S-15 (2) EHA360-22.5
(45 kW Total) or
(2) EHA156-22.5 (2) EHA150-30 (60 kW Total)
or (2) EHA156-30
(2) EHA360-45 (90 kW Total)
TABLE 6
LCH ELECTRIC HEAT SECTION FUSE RATING
VOLTAGES F3 - 1
F3 - 2
F3 - 3
FUSE (3 each) F3 - 4 F3 - 5
208/230V
60 Amp 250V
60 Amp 250V
-----
-----
-----
460V
50 Amp 600V
-----
-----
-----
-----
575V
40 Amp 600V
-----
-----
-----
-----
208/230V
50 Amp 250V
-----
-----
25 Amp 250V
50 Amp 250V
460V
25 Amp 600V
-----
-----
15 Amp 600V
25 Amp 600V
575V
20 Amp 600V
-----
-----
10 Amp 600V
20 Amp 600V
208/230V
50 Amp 250V
-----
-----
50 Amp 250V
50 Amp 250V
460V
25 Amp 600V
-----
-----
25 Amp 600V
25 Amp 600V
575V
20 Amp 600V
-----
-----
20 Amp 600V
20 Amp 600V
208/230V
50 Amp 250V
-----
60 Amp 250V
60 Amp 250V
50 Amp 250V
460V
25 Amp 600V
-----
-----
50 Amp 600V
25 Amp 600V
575V
20 Amp 600V
-----
-----
40 Amp 600V
20 Amp 600V
F3 - 6
-------------------------------------------------
F3 - 7
------------------------------------60 Amp 250V ---------
F3 - 8
-----
-----
-----
25 Amp 250V
15 Amp 600V
10 Amp 600V
50 Amp 250V
25 Amp 600V
20 Amp 600V
60 Amp 250V
50 Amp 600V
40 Amp 600V
Page 34
II-PLACEMENT AND INSTALLATION
Make sure the unit is installed in accordance with the installation instructions and all applicable codes. See accessories section for conditions requiring use of the optional roof mounting frame (LARMF18/36 or LARMFH30/36).
III-STARTUP - OPERATION - CHARGING
Refrigerant Charge R-454B
Unit
LGT/LCT302 Stage 1
Mc(lbs)
6.75
LGT/LCT302 Stage 2
6.50
LGT/LCT302 Stage 3
6.69
LGT/LCT302 Stage 4
6.81
LGT/LCT360 Stage 1
6.38
LGT/LCT360 Stage 2
6.81
LGT/LCT360 Stage 3
6.63
LGT/LCT360 Stage 4
6.38
Mc(kg)
3.06 2.95 3.03 3.09 2.89 3.09 3.01 2.89
WARNING - Do not exceed nameplate charge under any condition.
This unit is factory charged and should require no further adjustment. If the system requires additional refrigerant, reclaim the charge, evacuate the system, and add required nameplate charge.
When breaking into the refrigerant circuit to make repairs or for any other purpose conventional procedures shall be used. However, for flammable refrigerants it is important that best practice be followed and, since flammability is a consideration, the following procedure shall be adhered to:
· Safely remove refrigerant following local and na-
tional regulations,
· Evacuate the circuit,
· Purge the circuit with inert gas,
· Evacuate,
· Purge with inert gas,
· Open the circuit
The refrigerant charge shall be recovered into the correct recovery cylinders if venting is not allowed by local and national codes. For appliances containing flammable refrigerants, the system shall be purged with oxygenfree nitrogen to render the appliance safe for flammable refrigerants. This process might need to be repeated several times. Compressed air or oxygen shall not be used for purging refrigerant systems. Refrigerant purging shall be achieved by breaking the vacuum in the system with oxygen-free nitrogen and continuing to fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down to a vacuum. This process shall be repeated until no refrigerant is within the system. When the final oxygen-free nitrogen charge is used, the system shall be vented down to atmospheric pressure to enable work to take place. Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and
that ventilation is available.
In addition to conventional charging procedures, the following requirements shall be followed.
· Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimize the amount of refrigerant contained in them.
· Cylinders shall be kept in an appropriate position according to the instructions.
· Ensure that the refrigerating unit is earthed prior to charging the system with refrigerant.
· Label the system when charging is complete (if not already).
· Extreme care shall be taken not to overfill the refrigerating unit.
Prior to recharging the system, it shall be pressure-tested with the appropriate purging gas. The system shall be leak-tested on completion of charging but prior to commissioning. A follow up leak test shall be carried out prior to leaving the site.
· When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all refrigerants are removed safely. When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge is available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i. e. special cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure- relief valve and associated shut-off valves in good working order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
· The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of all appropriate refrigerants includ-ing, when applicable, flammable refrigerants. In ad-dition, a set of calibrated weighing scales shall be available and in good working order. Hoses shall be complete with leak-free disconnect couplings and in good condition. Before using the recovery machine, check that it is in satisfactory working order, has been properly maintained and that any associated electrical components are sealed to prevent ignition in the event of a refrigerant release. Consult manu-facturer if in doubt
Page 35
· The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant waste transfer note arranged. Do not mix refrigerants in recovery units and especially not in cylinders.
· If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that flammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to returning the compressor to the suppliers. Only electric heating to the compressor body shall be employed to accelerate this process. When oil is drained from a system, it shall be carried out safely.
Prior to recharging the system, it shall be pressuretested with the appropriate purging gas. The system shall be leak-tested on completion of charging but prior to commissioning. A follow up leak test shall be carried out prior to leaving the site
NOTE - System charging is not recommended below 60F (15C). In temperatures below 60F (15C), the charge must be weighed into the system.
If weighing facilities are not available, or to check the charge, use the following procedure:
1 - Make sure outdoor coil is clean. Attach gauge manifolds and operate unit at full CFM in cooling mode with economizer disabled until system stabilizes (approximately five minutes). Make sure all outdoor air dampers are closed.
2 - Compare the normal operating pressures to the pressures obtained from the gauges. Check unit components if there are significant differences.
3 - Measure the outdoor ambient temperature and the suction pressure. Refer to the charging curve to determine a target liquid temperature.
Note - Pressures are listed for sea level applications. 4 - Use the same thermometer to accurately measure
the liquid temperature (in the outdoor section).
· If measured liquid temperature is higher than the target liquid temperature, add refrigerant to the system.
· If measured liquid temperature is lower than the target liquid temperature, recover some refrigerant from the system.
· When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all refrigerants are removed safely. When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge is available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i. e. special cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure- relief valve and associated shut-off valves in good working order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
· When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge is available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i. e. special cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure-relief valve and associated shut-off valves in good working order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
· The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of all appropriate refrigerants including, when applicable, flammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working order. Hoses shall be complete with leak-free disconnect couplings and in good condition. Before using the recovery machine, check that it is in satisfactory working order, has been properly maintained and that any associated electrical components are sealed to prevent ignition in the event of a refrigerant release. Consult manufacturer if in doubt.
· The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant waste transfer note arranged. Do not mix refrigerants in recovery units and especially not in cylinders.
· If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that flammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to returning the compressor to the suppliers. Only electric heating to the compressor body shall be employed to accelerate this process. When oil is drained from a system, it shall be carried out safely.
5 - Add or remove charge in increments. Allow the system to stabilize each time refrigerant is added or removed.
6 - Continue the process until measured liquid temperature agrees with the target liquid temperature. Do not go below the target liquid temperature when adjusting charge. Note that suction pressure can change as charge is adjusted.
7 - Example LGT/LCT302H Circuit 1: At 95°F outdoor
ambient and a measured suction pressure of 128
psig, the target liquid temperature is 100°F. For a
measured liquid temperature of 106°F, add charge
in increments until measured liquid temperature
agrees with the target liquid temperature.
Page 36
Circuit 1 Circuit 2 Circuit 3 Circuit 4
65°F
Suct (psig)
Disc (Psig)
87
227
94
229
110
235
131
244
97
220
103
221
119
227
138
237
105
238
113
241
130
249
151
259
110
237
117
240
134
247
154
257
TABLE 7 LGT/LCT302H Normal Operating Pressures
Outdoor Coil Entering Air Temperature
75°F
85°F
95°F
Suct (psig)
Disc (Psig)
Suct (psig)
Disc (Psig)
Suct (psig)
Disc (Psig)
90
264
93
306
97
352
97
266
100
308
104
355
113
272
117
314
120
360
134
280
137
322
141
368
98
256
100
297
102
345
105
256
107
298
109
345
121
261
123
302
126
348
141
271
143
310
146
355
107
276
110
319
113
366
115
279
118
321
120
368
133
286
135
327
138
374
153
295
156
336
159
382
111
275
113
319
115
369
119
277
121
320
123
370
136
283
138
325
140
373
156
292
158
332
161
379
105°F
Suct (psig)
Disc (Psig)
100
404
107
406
124
412
145
419
104
398
112
398
129
400
149
406
116
418
123
420
141
425
162
432
117
425
125
425
143
427
163
432
115°F
Suct (psig)
Disc (Psig)
104
459
111
462
128
467
149
475
107
458
114
457
131
458
152
463
119
475
127
477
145
481
166
488
120
488
128
487
146
487
167
491
Liquid Temperature (°F)
130 120 110 100
90 80 70 60
90
Circuit 1 - LGT/LCT302 - No Reheat & Reheat
OD Temp (°F) 115
105 95 85
75 65
100
110
120
130
140
150
Suction Pressure (psig)
Page 37
Liquid Temperature (°F)
130 120 110 100
90 80 70 60
95
135 125 115 105
95 85 75 65
100
Circuit 2 - LGT/LCT302 - No Reheat & Reheat
OD Temp (°F)
115 105 95 85 75 65
105
115
125
135
145
Suction Pressure (psig)
Circuit 3 - LGT/LCT302 - No Reheat & Reheat
155
OD Temp (°F) 115
105 95 85 75 65
110
120
130
140
150
160
170
Suction Pressure (psig)
Liquid Temperature (°F)
Page 38
Liquid Temperature (°F)
130 120 110 100 90 80 70 60
105
Circuit 1 Circuit 2 Circuit 3 Circuit 4
65°F
Suct (psig)
Disc (Psig)
82
232
90
237
107
247
121
254
91
228
98
232
114
240
130
247
99
254
108
258
126
268
144
280
105
245
113
248
128
256
144
269
Circuit 4 - LGT/LCT302 - No Reheat & Reheat
OD Temp (°F) 115
105 95 85 75 65
115
125
135
145
155
165
Suction Pressure (psig)
TABLE 8 LGT/LCT360H Normal Operating Pressures
Outdoor Coil Entering Air Temperature
75°F
85°F
95°F
Suct (psig)
Disc (Psig)
Suct (psig)
Disc (Psig)
Suct (psig)
Disc (Psig)
85
269
89
309
92
355
94
274
97
315
101
360
110
284
114
325
118
370
125
291
129
333
133
378
93
265
94
307
96
354
100
269
103
311
105
358
117
276
119
318
122
364
133
282
136
323
139
369
101
293
103
337
105
386
111
297
113
341
115
389
129
306
131
350
134
398
147
318
150
361
152
409
106
283
107
325
109
372
114
285
116
327
118
374
131
293
134
334
136
381
148
305
151
346
154
392
105°F
Suct (psig)
Disc (Psig)
95
404
104
410
121
420
137
428
98
406
106
410
124
415
142
420
107
439
117
442
136
450
155
461
110
425
119
426
138
432
157
443
115°F
Suct (psig)
Disc (Psig)
98
457
107
463
125
473
141
481
99
463
108
467
126
472
145
476
109
497
119
500
138
508
157
518
111
482
121
483
141
489
160
499
Page 39
Liq. Temp. (F)
140 130 120 110 100
90 80 70 60
90
130 120 110 100
90 80 70 60
90
Circuit 1 - LGT/LCT360 - No Reheat
OD Temp (°F)
85 75 65
115 105 95
100
110
120
130
140
150
Suction Pressure (psig)
Circuit 2 - LGT/LCT360 - No Reheat
OD Temp (°F) 115
105 95 85 75 65
100
110
120
130
140
150
Suction Pressure (psig)
Liq. Temp. (F)
Page 40
Liq. Temp. (F)
130 120 110 100
90 80 70 60
95
140 130 120 110 100
90 80 70
100
Circuit 3 - LGT/LCT360 - No Reheat
OD Temp (°F) 115
105 95 85 75 65
105
115
125
135
145
155
165
Suction Pressure (psig)
Circuit 4 - LGT/LCT360 - No Reheat
OD Temp (°F)
115 105 95 85 75 65
110
120
130
140
150
160
170
Suction Pressure (psig)
Liq. Temp. (F)
Page 41
IV- SYSTEMS SERVICE CHECKS
A-Cooling System Service Checks
All units are factory charged and require no further adjustment; however, charge should be checked periodically using the normal operating pressure method. 1-Gauge Manifold Attachment
Attach high pressure line to discharge line Schrader port and the low pressure line to the suction line Schrader port. NOTE-When unit is properly charged discharge line pressures should approximate those in Refrigerant Check and Charge section. V-MAINTENANCE
The unit should be inspected once a year by a qualified service technician.
WARNING
Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.
WARNING
Any service personnel installing, decommissioning, or performing maintenance on the unit must be properly trained with A2L refrigerants
Prior to beginning work on systems containing refigerant to ensure the risk of ignition is minimized:
· All work shall be undertaken under a controlled procedure so as to minimize the risk of a flammable gas or vapor being present while the work is being performed.
· The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of potentially toxic or flammable atmospheres. Ensure that the leak detection equipment being used is suitable for use with all applicable refrigerants, i. e. non-sparking, adequately sealed or intrinsically safe.
· If any hot work is to be conducted on the refrigerating equipment or any associated parts, the appropriate fire extinguishing equipment shall be available to hand. Have a dry powder or CO2 fire extinguisher adjacent to the charging area.
· No person carrying out work in relation to a refrigerating system which involves exposing any pipe work shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during which refrigerant can possibly be released to the surrounding space.
Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no flammable hazards or ignition risks. "No Smoking" signs shall be displayed.
· Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work.
A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere.
· Where electrical components are being changed, service technicians shall be fit for the purpose and to the correct specification. At all times the manufacturer's maintenance and service guidelines shall be followed. If in doubt, consult the manufacturer's technical department for assistance. The following checks shall be applied to installations using flameable refrigerants as applicable:
1 - The actual refrigerant charge is in accordance with the room size within which the refrigerant containing parts are installed.
2 - The ventilation machinery and outlets are operating adequately and are not obstructed.
3 - If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of refrigerant.
4 - Markings on the equipment should be visible and legible. Markings and signs that are illegible shall be corrected.
5 - Refrigerating pipes or components are installed in a position where they are unlikely to be exposed to any substance which may corrode refrigerant containing components, unless the components are constructed of materials which are inherently resistant to being corroded or are suitably protected against being so corroded.
· For systems containing refigerant all repair and maintenance to electrical components shall include initial safety checks and component inspection procedures such as that capacitors are discharged in a safe manner to avoid possibility of sparking, that no live electrical components and wiring are exposed while charging, recovering, or purging the system, and that there is continuity of earth bonding. If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solution shall be used that is reported to the owner of the equipment, so all parties are advised.
NOTE - Sealed electrical components shall be replaced, not repaired.
NOTE - Intrinsically safe components must be replaced, not repaired.
Page 42
· Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. Electronic leak detectors may be used to detect refrigerant leaks but, in the case of flammable refrigerants, the sensitivity may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used. Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed, and the appropriate percentage of gas (25 % maximum) is confirmed. Leak detection fluids are also suitable for use with most refrigerants but the use of detergents containing chlorine shall be avoided as the chlorine may react with the refrigerant and corrode the copper pipe-work. If a leak is suspected, all naked flames shall be removed/extinguished. If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut off valves) in a part of the system remote from the leak.
· When breaking into the refrigerant circuit to make repairs or for any other purpose conventional procedures shall be used. However, for flammable refrigerants it is important that best practice be followed, since flammability is a consideration. The following procedure shall be adhered to:
a. Safely remove refrigerant following local and national regulations,
b. Evacuate the circuit,
c. Purge the circuit with inert gas,
d. Evacuate,
e. Purge with inert gas,
f. Open the circuit.
· The refrigerant charge shall be recovered into the correct recovery cylinders if venting is not allowed by local and national codes. For appliances containing flammable refrigerants, the system shall be purged with oxygen-free nitrogen to render the appliance safe for flammable refrigerants. This process might need to be repeated several times. Compressed air or oxygen shall not be used for purging refrigerant systems. Refrigerant purging shall be achieved by breaking the vacuum in the system with oxygen-free nitrogen and continuing to fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down to a vacuum. This process shall be repeated until no refrigerant is within the system. When the final oxygen-free nitrogen charge is used, the system shall be vented down to atmospheric pressure to enable work to take place. Ensure that the outlet for the
vacuum pump is not close to any potential ignition
sources and that ventilation is available.
A-Filters
All units are equipped with twelve 20" x 20" x 2" (508mm x 508mm x 51mm) pleated throw-away type filters. Filters may be accessed through the economizer / filter access door (left of the blower door). All filters are removed by pulling on the pull tab, located on the bottom of each row of filters. Filters should be checked monthly (or more frequently in severe use) and cleaned or replaced regularly. Take note of the "AIR FLOW DIRECTION" marking on the filter frame when re-installing. NOTE-Filters must be U.L.C. certified or equivalent for use in Canada.
CAUTION
Be careful when servicing unit to avoid accidental contact with sharp metallic edges which may cause personal injury.
B-Lubrication
All motors and blower wheels used are prelubricated; no further lubrication is required.
C-Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated dirt or dust. Turn off power before attempting to remove access panel or to clean blower wheel. If balancing clips are removed, make sure they are reinstalled in the same location when cleaning is completed.
NOTE-Do not lose balancing clips. D-Evaporator Coil
Inspect and clean coil at beginning of each season. Clean using mild detergent or commercial coil cleanser. Check condensate drain pan and line, if necessary. Flush coil and condensate drain with water taking care not to get insulation, filters and return air ducts wet. Check connecting lines and coil for evidence of oil and refrigerant leaks.
E-Condenser Coil
Clean condenser coil annually with water and inspect monthly during the cooling season. Access panels are provided on front and back of condenser section.
Clean the all-aluminum coil by spraying the coil steadily and uniformly from top to bottom. Do not exceed 900 psi or a 45 angle; nozzle must be at least 12 inches from the coil face. Take care not to fracture the braze between the fins and refrigerant tubes. Reduce pressure and work cautiously to prevent damage.
NOTE-If owner complains of insufficient cooling, the unit should be gauged and refrigerant charge checked. Refer to Gauge Manifold Attachment and Charging sections in this manual.
F-Electrical
1- Check all wiring for loose connections.
2- Check for correct voltage at unit (unit operating).
3- Check amp-draw on both condenser fan motor and
blower motor.
Fan Motor Rating Plate ____ Actual ________
Indoor Blower Motor Rating Plate____ Actual____
Page 43
VI-ACCESSORIES
The accessories section describes the application of most of the optional accessories which can be factory- or field-installed.
A-LARMF18/36-14, 24 or LARMFH30/36-30, 41
Mounting Frames
When installing the LCT units on a combustible surface for downflow discharge applications, the Lennox LARMF18/36 14-inch or 24-inch (356 mm or 610mm) height roof mounting frame is used. For horizontal discharge applications, use LARMFH30/36 30-inch or 41inch (762mm or 1041mm) height roof mounting frame. This frame converts unit from down-flow to horizontal air flow. The 14 and 24 inch (356 and 610mm) downflow and 41 inch (1041mm) horizontal frame meets National Roof ing Code requirements. The roof mounting frames are recommended in all other applications but not required. If the units are not mounted on a flat (roof) surface, they MUST be supported under all edges and under the middle of the unit to prevent sagging. The units MUST be mounted level within 1/16" per linear foot or 5mm per meter in any direction.
The assembled LARMF18/36 mounting frame is shown in FIGURE 19. Refer to the roof mounting frame installation instructions for details of proper assembly and mounting. The roof mounting frame MUST be squared to the roof and level before mounting. Plenum system MUST be installed before the unit is set on the mounting frame. Typical roof curbing and flashing is shown in FIGURE 20. Refer to the roof mounting frame installation instructions for proper plenum construction and attachment.
B-Control Systems
The A55 Unit Controller provides all control function for the rooftop unit. Default operation requires a standard room thermostat or direct digital controller (DDC). The A55 can also control the unit from a zone temperature sensor. The A55 Unit Controller is a network controller when daisychained to the L Connection® Network Control System. For ease of configuration, the A55 can be connected to a PC with Unit Controller PC software installed.
C-Transitions
Optional supply/return transitions LASRT30/36 are available for use with LCT series units utilizing optional LARMF18/36 roof mounting frame. Transition must be installed in the LARMF18/36 mounting frame before mounting the unit to the frame. Refer to the manufacturer's instructions included with the transition for detailed installation procedures.
ASSEMBLED ROOF MOUNTING FRAME
END
BACK
FRONT
END
CENTER SUPPORTS (TWO PIECES EACH)
FIGURE 19
TYPICAL FLASHING DETAIL UNIT BASE
BOTTOM
FIBERGLASS INSULATION (Furnished)
UNIT BASE RAIL
NAILER STRIP (Furnished)
RIGID INSULATION (Field Supplied)
COUNTER FLASHING (Field Supplied) CANT STRIP (Field Supplied)
ROOF MOUNTING FRAME (Extends around entire
perimeter of unit)
ROOFING MATERIAL
FIGURE 20
Page 44
D-Supply and Return Diffusers
Optional flush mount diffuser/return FD11 and extended mount diffuser/return RTD11 are available for use with the LGT units. Refer to manufacturer's instructions included with transition for detailed installation procedures. E-E1DAMP25D-1 & E1DAMO15D-1 Outdoor
Air Dampers
E1DAMP25D-1- & E1DAMO15D-1 consists of a set of dampers which may be manually or motor operated to allow up to 25 percent outside air into the system at all times (FIGURE 21). Either air damper can be installed in LGT units. Washable filter supplied with the outdoor air dampers can be cleaned with water and a mild detergent. It should be sprayed with Filter Handicoater when dry prior to reinstallation. Filter Handicoater is R.P. Products coating no. 418 and is available as Lennox Part No. P-8-5069. F-E1ECON15D-1 Economizer
(Field or Factory Installed)
The optional economizer can be used with LGT units in downflow and horizontal air discharge applications. The economizer uses outdoor air for free cooling when temperature and/or humidity is suitable. An economizer hood is furnished with the economizer.
NOTE - Gravity exhaust dampers are required with power exhaust.
The economizer is controlled by the A55 Unit Controller. The economizer will operate in one of four modes.These settings are available through the main menu at SETUP > TEST & BALANCE > DAMPER Each mode also requires different sensors.
MANUAL OUTDOOR AIR DAMPER
MOTORIZED OUTDOOR AIR DAMPER
FILTER BRACKET SIDE VIEW
HOOD TOP SEAL HOOD TOP FILTER
FIGURE 21
Page 45
1-"TMP" MODE (SENSIBLE TEMPERATURE)
In the "TMP" mode, the A55 Unit Controller uses input from the factory installed RT6 Supply Air Sensor, RT16 Return Air Sensor, and RT17 Outdoor Air Sensor to determine suitability of outside air and economizer damper operation. When outdoor sensible temperature is less than return air sensible temperature, outdoor air is used for cooling. This may be supplemented by mechanical cooling to meet comfort demands. This application does not require additional optional sensors.
2-"ODE" MODE (OUTDOOR ENTHALPY)
The "ODE" or outdoor enthalpy mode requires a factory or field-provided and -installed Honeywell C7400 enthalpy sensor (53W64). The sensor monitors outdoor air temperature and humidity (enthalpy). When outdoor air enthalpy is below the enthalpy control setpoint, the economizer modulates to allow outdoor air for free cooling.
3-"DIF" MODE (DIFFERENTIAL ENTHALPY)
The "DIF" or differential enthalpy mode requires two factory or field-provided and -installed Honeywell C7400 enthalpy sensors (53W64). One sensor is installed in the outside air opening and the other sensor is installed in the return air opening. When the outdoor air enthalpy is below the return air enthalpy, the economizer opens to bring in outdoor air for free cooling.
4-"GLO" MODE (GLOBAL)
Global Mode - The "GLO" or global mode is used with an energy management system which includes a global control feature. Global control is used when multiple units (in one location) respond to a single outdoor air sensor. Each energy management system uses a specific type of outdoor sensor which is installed and wired by the controls contractor.
Motorized Outdoor Air Damper - The "GLO" mode is also
used when a motorized outdoor air damper is installed in
the system.
NOTE - All economizer modes of operation will modulate dampers to 55F (13C) supply air.
G-Gravity Exhaust Dampers
E1DAMP60D-1 dampers are used in downflow and LAGEDH30/ 36 are used in horizontal air discharge applications. E1DAMP60D-1 dampers are installed in the return air compartment of the unit (FIGURE 22). LAGEDH30/ 36 gravity exhaust dampers are installed in the return air plenum. The dampers must be used any time an economizer or power exhaust fans are applied to LGT series units. An exhaust hood is furnished with any type of gravity exhaust damper.
Gravity exhaust dampers allow exhaust air to be discharged from the system when an economizer and/or power exhaust is operating. Gravity exhaust dampers also prevent outdoor air infiltration during unit off cycle. See installation instructions for more detail. LAGED(H)30/36 dampers are used with LGT series units. See installation instructions for more detail.
E1DAMP60D-1 AND LAPEF INSTALLATION
ECONOMIZER FRESH AIR HOOD
LAPEF POWER EXHAUST
FAN ASSEMBLY
LAGED GRAVITY EXHAUST DAMPERS
FIGURE 22 H- E1PWRE40D-1 Power Exhaust Fans Power exhaust fans are used with LGT in downflow applications only. E1PWRE40D-1 power exhaust fans require optional E1DAMP60D-1 downflow gravity exhaust dampers and E1ECON15D-1 economizer. Power exhaust fans provide exhaust air pressure relief and run when return air dampers are closed and supply air blowers are operating. FIGURE 22 shows location of the power exhaust fans. See installation instructions for more detail. I-Smoke Detectors A171, A172, A173 Photoelectric smoke detectors are a factory installed option. The smoke detectors can be installed in the supply air section (A172), return air section (A171), or in both the supply and return air section. Smoke detection control module (A173) is located below the control panel. Wiring for the smoke detectors are shown on the temperature control section (C) wiring diagram in back of this manual.
Page 46
J-Blower Proving Switch S52
The blower proving switch monitors blower operation and locks out the unit in case of blower failure. The switch is N.O. and closes at 0.15" W.C. (37.4 Pa) The switch is mounted on the middle left corner of the blower support panel. Wiring for the blower proving switch is shown on the temperature control section (C) wiring diagram in back of this manual.
K-Dirty Filter Switch S27
The dirty filter switch senses static pressure increase indicating a dirty filter condition. The switch is N.O. and closes at 0.85" W.C. (211.7 Pa). The switch is mounted on the top corner of the economizer. Wiring for the dirty filter switch is shown on the temperature control section (C) wiring diagram in back of this manual. Actuation of this switch does not affect unit operation.
.L-Indoor Air Quality (CO2) Sensor A63
The indoor air quality sensor monitors CO2 levels and reports the levels to the Unit Controller A55. The board adjusts the economizer dampers according to the CO2 levels.
The sensor is mounted next to the indoor thermostat or in the return air duct. Refer to the indoor air quality sensor installation instructions for proper adjustment. Wiring for the indoor air quality switch is shown on the temperature control section (C) wiring diagram in back of this manual.
M-Supply Air Variable Frequency Drive VAV units only
NOTE - Units equipped a Variable Frequency Drive (VFD) are designed to operate on balanced, three-phase power. Operating units on unbalanced three-phase power will reduce the reliability of all electrical components in the unit.
Unbalanced power is a result of the power delivery system supplied by the local utility company. Factory-installed inverters are sized to drive blower motors with an equivalent current rating using balanced three-phase power. If unbalanced three-phase power is supplied; the installer must replace the existing factory-installed inverter with an inverter that has a higher current rating to allow for the imbalance.
Refer to the installation instructions for additional information and available replacements. VAV units contain a supply air blower equipped with a variable frequency drive A96 (VFD) which varies supply air CFM. As duct static increases, the supply air volume will decrease. As duct static decreases, the supply air volume will increase.
In VAV units, the Unit Controller uses input from a field-installed pressure transducer (A30) to maintain a 1.0" w.c. (default) static pressure. Refer to the Unit Controller manual parameter 388 and 389 to adjust the static pressure setpoint.
The pressure transducer is shipped in a box in the blower compartment. Install the transducer according to manufacturer's instructions.
Note -Make sure the transducer is installed in the main duct at least 2/3 of the distance away from the unit.
The supply air VFD (A96) is located near the compressors.
The Unit Controller will lock-out the unit for 5 minutes(default) if static pressure exceeds 2.0"w.c. for 20 seconds. The Unit Controller will permanently shut down the unit after three occurrences. Use the following parameters to adjust the default values:
Parameter 110; Error time off delay.
Parameter 42; Air Supply Static Shutdown Set Point.
Parameter 43; Static Pressure Lockout Counter Set Point.
Page 47
VAV By-Pass Operation (Optional)
IMPORTANT - All dampers must be open to prevent damage to duct work and dampers.
1 - Turn off all power to unit.
2- Locate K3, K203, J248 and J249 connectors near the VFD. See FIGURE 26.
3- Disconnect J248 from P248 and connect connect P248 jumper plug to J248. P248 jumper plug is attached to the J248 wire harness near the J248 jack connector. See FIGURE 24.
4- Disconnect P247 from J247 and connect J249 to P247. See FIGURE 25.
5 - L ocate VFD control relay K203 on the lower control panel. See FIGURE 26.
6- Disconnect wires marked K203-A and K203-B
7- Connect K3-A (female terminal) to K203-A (male terminal) and K3-B (female terminal) to K3-B (male terminal)
8- Restore power to unit. Blower will operate in constant air volume (CAV) mode.
9- Check the indoor blower motor nameplate for full load amperage (FLA) value. Measure the amp readings from the indoor blower motor operating in bypass mode. If measured amps are higher than nameplate FLA value, decrease the CFM by opening (turning counterclockwise) the motor pulley. Refer to the Indoor Blower Motor section. Do not exceed minimum and maximum number of pulley turns as shown in table 1.
VAV BY-PASS CONNECTOR
From Relay
Connect From Contactor
K203-A K203-B Disconnect
K3-A K3-B K203-A K203-B
K203-A K203-B From A55
FIGURE 23
From A55
VAV BY-PASS CONNECTOR
Disconnect
P248
Connect
J248
P248
Jumper Plug
J248
FIGURE 24
BY-PASS CONNECTOR
Disconnect
Connect
P247
P247
J249
J247
FIGURE 25
SUPPLY AIR VARIABLE FREQUENCY DRIVE
A55 A96 K202 S42
UNIT CONTROLLER
A178
K3
TB25
FIGURE 26 Page 48
N-Drain Pan Overflow Switch S149 (optional)
The overflow switch is used to interrupt cooling operation when excessive condensate collects in the drain pan. The N.O. overflow switch is controlled by K220 and DL46 relays, located in the unit control panel. When the overflow switch closes, 24VAC power is interrupted and after a fivesecond delay the unit compressors are de-energized.
Once the condensate level drops below the set level, the switch will open. After a five-minute delay the compressor will be energized.
O-Hot Gas Reheat Start-Up and Operation
General
Hot gas reheat units provide a dehumidifying mode of operation. These units contain a reheat coil adjacent to and downstream of the evaporator coil. Reheat coil solenoid valves, L14 and L30, route hot discharge gas from the compressor to the reheat coil. Return air pulled across the evaporator coil is cooled and dehumidified; the reheat coil adds heat to supply air.
See FIGURE 27 for reheat refrigerant routing. See FIGURE 28 for cooling only refrigerant routing.
L14/L30 Reheat Coil Solenoid Valve
When Unit Controller input (Unit Controller J298-5 or J299-8) indicates room conditions require dehumidification, L14/L30 reheat valve is energized (Unit Controller P269-3 or P269-4) and refrigerant is routed to the reheat coil.
Reheat Setpoint
Reheat is factory-set to energize when indoor relative humidity rises above 60% (default). The reheat setpoint can be adjusted by changing Unit Controller Settings - Control menu. A setting of 100% will operate reheat from an energy management system digital output
Reheat will terminate when the indoor relative humidity falls 3% (57% default) or the digital output de-energizes. The reheat deadband can be adjusted at Settings - Control menu.
A91 Humidity Sensor
Relative humidity should correspond to the sensor (A91) output voltage listed in the table below. For example: if indoor air relative humidity is 80% + 3%, the humidity sensor output should read 8.00VDC.
Check the sensor output annually for accuracy. Keep the air intake openings on the sensor clean and free of obstructions and debris
Relative Humidity (%RH + 3%)
Sensor Output (VDC)
20
2.00
30
3.00
40
4.00
50
5.00
60
6.00
70
7.00
80
8.00
90
9.00
Check-Out Test reheat operation using the following procedure.
1 - Make sure reheat is wired as shown in wiring section.
Make sure unit is in local thermostat mode.
Use the Unit Controller key pad to elect SERVICE TEST DEHUMIDIFIER
300, 360 - The blower, compressor 1, and compressor 2 (reheat) should be operating. L14 and L30 LEDs on the Unit Controller should also be ON, indicating the reheat valves are energized, REHEAT MODE will be appear on the Unit Controller display.
Press BACK on the Unit Controller display to stop the testing mode.
Default Reheat Operation
Reheat will operate as shown inTABLE 9 once three conditions are met.
1 - Blower must be operating.
System must be in occupied mode.
System must NOT be operating in heating mode.
IMPORTANT - Free cooling does not operate during reheat.
For other reheat control options, refer to the Unit Controller manual.
Additional Cooling Stages (3-Stage)
Units are shipped from the factory to provide two stages of cooling.
Three stages of cooling is available in zone sensor mode. Three stages of cooling is also available by installing a transfer relay and a three-stage thermostat. Refer to the Main Control Operation section in the Unit Controller manual when using the transfer relay.
Additional Cooling Stages (4-Stage)
Four stages of cooling is available in zone sensor mode on units with four compressors.
Compressors are not de-energized when unit operation changes from cooling to reheat or from reheat to cooling. Instead, L14 and L30 reheat valves are energized (reheat) or de-energized (cooling).
NOTE - Another thermostat staging option is available which allows both compressors to be energized during free cooling. See Unit Controller manual for details.
Page 49
"NEUTRAL" DEHUMIDIFIED
AIR
REHEAT MODE REFRIGERANT ROUTING 300, 360H4M
EVAPORATOR COIL
NOTE:Refrigerant circuits one and two operate during reheat.
MIXED INDOOR/OUTDOOR
AIR
REHEAT COIL
CONDENSER COIL
REHEAT COIL
"NEUTRAL" DEHUMIDIFIED
AIR
FIGURE 27
COOLING MODE REFRIGERANT ROUTING 300, 360H4M
EVAPORATOR COIL MIXED INDOOR/OUTDOOR AIR
REHEAT COIL
REHEAT COIL
CONDENSER COIL
OUTDOOR AIR
REFRIGERANT CIRCUIT 1 REFRIGERANT CIRCUIT 2 REFRIGERANT CIRCUIT 3 REFRIGERANT CIRCUIT 4 REHEAT VALVE
CHECK VALVE THERMAL EXPANSION VALVES
FIGURE 28 Page 50
OUTDOOR AIR
REFRIGERANT CIRCUIT 1 REFRIGERANT CIRCUIT 2 REFRIGERANT CIRCUIT 3 REFRIGERANT CIRCUIT 4 REHEAT VALVE
CHECK VALVE THERMAL EXPANSION VALVES
TABLE 9 REHEAT OPERATION
Two-Stage Thermostat - Default
T'stat and Humidity Demands
Operation 300, 360 (4-Compressors)
Reheat Only
Compressor 1 & 2 Reheat
Reheat & Y1
Compressor 1 & 2 Reheat Compressor 3 Cooling¹
Reheat & Y1 & Y2
Compressor 1, 2, 3, & 4 Cooling³
Three-Stage Thermostat (Transfer relay required)
T'stat and Humidity Demands
Operation 300, 360 (4-Compressors)
Reheat Only
Compressor 1 & 2 Reheat
Reheat & Y1
Compressor 1 & 2 Reheat Compressor 3 Cooling¹
Reheat & Y1 & Y2
Compressor 1 & 2 Reheat Compressor 3 & 4 Cooling³
Reheat & Y1 & Y2 & Y3
Compressor 1, 2, 3, & 4 Cooling
Four-Stage Zone Sensor Mode
Cooling* and Humidity** Demands
Operation 300, 360 (4-Compressors)
Reheat Only
Compressor 1 & 2 Reheat
Reheat & Y1
Compressor 1 & 2 Reheat Compressor 3 Cooling¹
Reheat & Y1 & Y2
Compressor 1 & 2 Reheat Compressor 3 & 4 Cooling²
Reheat & Y1 & Y2 & Y3
Compressor 1 Reheat, Compressor 2, 3, & 4 Cooling³
Reheat & Y1 & Y2 & Y3 & Y4
Compressor 1, 2, 3, & 4 Cooling
*Cooling stage is initiated when zone temperature is higher than the cooling setpoint plus the appropriate stage differential.
**Reheat demand is initiated when relative humidity is higher than relative humidity setpoint.
¹If there is no reheat demand and outdoor air is suitable, free cooling will operate.
²If there is no reheat demand and outdoor air is suitable, free cooling and compressor 1 will operate.
³If there is no reheat demand and outdoor air is suitable, free cooling and compressor 1 and 2 will operate.
If there is no reheat demand and outdoor air is suitable, free cooling and compressor 1, 2, and 3 will operate.
If there is no reheat demand and outdoor air is suitable, free cooling and compressor 1, 2, 3, and 4 will operate.
The following conditions must be met before reheat will be energized: (factory-default; see Unit Controller manual for other options)
1 - Blower must be operation.
System must be in occupied mode.
System must NOT be operating in heating mode.
Page 51
VII-Decommissioning
Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of recovered refrigerant. It is essential that electrical power is available befor the task is commenced.
Steps to ensure this are:
· Become familiar with the equipment and its operation,
· Isolate the system electrically,
· Ensure that before attempting the procedure that mechanical handling equipment is available, if required, for handling refrigerant cylinders, and that all personal protective equipment is available and being used correctly while the recovery process is supervised at all times by a competent person and that the recovery equipment and cylinders conform to the appropriate standards.
Additionally, pump down refrigerant system, if possible, and if a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system. Make sure that cylinders are situated on the scales before recovery takes place. Start the recovery machine and operate in accordance with instructions. Do not overfill cylinders (no more than 80 % volume liquid charge). Do not exceed the maximum working pressure of the cylinder, even temporarily. When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off. Recovered refrigerant shall not be charged into another refrigerating system unless it has been cleaned and checked.
Equipment shall be labeled stating that it has been decommissioned and emptied of refrigerant. The label shall be dated and signed. For appliances containing flammable refrigerants, ensure that there are labels on the equipment stating the equipment contains flammable refrigerant.
Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used.
Electronic leak detectors may be used to detect refrigerant leaks but, in the case of flammable refrigerants, the sensitivity may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used. Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed, and the appropriate percentage of gas (25 % maximum) is confirmed. Leak detection fluids are also suitable for use with most refrigerants but the use of detergents containing chlorine shall be avoided as the chlorine may react with the refrigerant and corrode the copper pipe-work. If a leak is suspected, all naked flames shall be removed/extinguished. If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut off valves) in a part of the system remote from the leak.
When breaking into the refrigerant circuit to make repairs or for any other purpose conventional procedures shall be used. However, for flammable refrigerants it is important that best practice be followed, since flammability is a consideration. The following procedure shall be adhered to:
· Safely remove refrigerant following local and national regulations,
· Evacuate the circuit,
· Purge the circuit with inert gas,
· Evacuate,
· Purge with inert gas,
· Open the circuit.
The refrigerant charge shall be recovered into the correct recovery cylinders if venting is not allowed by local and national codes. For appliances containing flammable refrigerants, the system shall be purged with oxygenfree nitrogen to render the appliance safe for flammable refrigerants. This process might need to be repeated several times. Compressed air or oxygen shall not be used for purging refrigerant systems. Refrigerant purging shall be achieved by breaking the vacuum in the system with oxygen-free nitrogen and continuing to fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down to a vacuum. This process shall be repeated until no refrigerant is within the system. When the final oxygen-free nitrogen charge is used, the system shall be vented down to atmospheric pressure to enable work to take place. Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and that ventilation is available.
Page 52
VIII-WIRING DIAGRAMS AND OPERATION SEQUENCE Page 53
Page 54
SEQUENCE OF OPERATION EHA 15 - 90 Y & G
The Y voltage diagram use elements configured in a Wye. The G and J voltage diagram use elements configured in a Delta. Both diagrams follow the following sequence of operation:
NOTE:Two electric heat sections are used in all 15kW through 90kW heaters. The heat sections are labelled first electric heat section (left side) and second electric heat section (right side). See FIGURE 18.
NOTE: In the case of EHA 15 and 30kW, the second heat section (right side) is a slave (only has electric heat elements and a limit). Line voltage is supplied to elements in both heat section one (left side) and two (right side) by the contactors in heat section one (left side).
HEATING ELEMENTS:
1 - Terminal strip TB3 is energized when the unit disconnect closes. TB3 supplies line voltage to electric heat elements HE1 through HE14. Each heating element is protected by fuse F3.
FIRST STAGE HEAT:
2 - Heating demand initiates at W1 in thermostat.
3 - 24VAC is routed to the main control module A55. After A55 proves N.C. primary limits S15 (heat section one, left side), S107 (heat section two, right side), the electric heat contactor K15 and heat relay K9 are energized.
4 - N.O. contact K15-1 closes allowing the first bank of elements in heat section one (left side) to be energized.
5 - At the same time, N.O. contacts K9-1 close. A N.O. contact in A55 closes, energizing electric heat relay K17.
6 - N.O. contacts K17-1 close allowing the first set of elements in heat section two (right side) to be energized.
SECOND STAGE HEAT:
7 - With the first stage heat operating, an additional heating demand initiates at W2 in the thermostat.
8 - 24VAC is routed through the main control module A55, which in turn energizes the electric heat contactor K16.
9 - N.O. contacts K16-1 close allowing the second set of elements in heat section one (left side) to be energized.
10 - Simultaneous with step eight, a N.O. contact in the A55 Unit controller closes, allowing 24VAC to energize electric heat contactor K18.
11 - N.O. contacts K18-1 close allowing the second set of elements in heat section two (right side) to be energized.
END OF SECOND STAGE HEAT:
12 - Heating demand is satisfied. Terminal W2 in the thermostat is de-energized.
13 - Electric heat contactors K16 and K18 are deenergized.
14 - The second set of electric heat elements in heat sections one (left side) and two (right side) are deenergized.
END OF FIRST STAGE HEAT:
15 - Heating demand is satisfied. Terminal W1 in the thermostat is de-energized.
16 - Electric heat contactors K15 and K17 are deenergized.
17 - The first set of electric heat elements in heat sections one (left side) and two (right side) are deenergized.
Page 55
THERMOSTAT
P255 P255 BL U
RED
WHT WHT
RE D PNK
GRY GRY
S E NS OR 1 J 261
YEL YEL PNK GRY
123
6
A1 7 3
CT RL S MOKE DE T E CT
J 250 P250
YEL Y
1
YEL
YEL Y
2
YEL
RED R
3
PNK
BLK B
4
GRY
S E NS OR 2
J 252 P252
YEL Y
YEL
1
YEL
Y
YEL
2
PNK
R
RED
3
GRY
B
BLK
4
4
P251 J 251 YEL
1 YEL
2 RED
3 BLK
4 P253 J 253
1 YEL
2 YEL
3 RED
4 BLK
15 16 17 1 2
1, 5
YEL
4
361 2
RED
RED
F I RE AL ARM CONT ACT S UPPL I E D BY OT HE RS
5
1
2
DI - 1
R
9
5
F ROM I AQ WI RI NG DI AGRAM
8 R E D
1
2
A55. J 299 RE D- BL K GRY RE D- BL K GRY RED RED
ORN P424 YEL WB- 031
WB- 030
P299
1
2
P387
J 299
J 387
123
4
5 6 7 8 9 10
38
49
10 5 2 7 1 6
R DI - 1
C R
G C
W1 W2
DI - 2 Y1 Y2 R
DI - 3 OCP GL O R
DI - 4 DO- 1
C FREE R C
S52 AI - 1
GND GND
S27 HUM
GND GND
2 4 VAC T E MP
S149 AI - 2
I ON C
GND R
FREE GND
A5 5
MAI N CT RL
1234 5678 J 297 P297
9 10
123456
J 298 P298
7 8 9 10
A55. J 298
3
C
Y1
2
6
Y2
7
R C I AQ+
123
A55. J 298
A55. J 297
RCG
Y1
123
6
2
B
A
T O PROVI DE T HRE E COMPRE S S OR S T AGE S . RE QUI RE S 3 HE AT , 3 COOL T HE RMOS T AT AND K27 RE L AY
4
3 S T AGE COOL I NG/ 3 S T AGE HE AT I NG
A55. J 298
7
R I AQ+ I AQ134
7
187
R C I AQ+ 123
PUR WB- 044
GRY
7
WB- 045 WHT
WB- 046
TO B5- SECT L OC CC03
APPL I E S ONL Y T O D- BOX
J 387
C
2
A5 5
J 298 J 297 J 299
2
L ONT a l k MODUL E
T O M4 T HE RMOS T AT I NPUT
AL L OT HE R T HE RMOS T AT S I GNAL S RE MAI N CONNE CT E D AS S HOWN ON T HE T OP
T O PROVI DE S UPE RMARKE T RE HE AT S CHE ME US E S 86 DE HUMI DI S T AT AND K55
S UPE RMARKE T RE HE AT
DE NOT E S OPT I ONAL COMPONE NT S AND WI RI NG
CL AS S 2 F I E L D WI RI NG
Model:
Voltage: Supersedes:
LC, LG, LH, LD Series RTU
Thermostat
All Voltages
538078-01 Form No: 5 3 8 0 7 8 - 0 2 Rev: 0
H E AT ING
COOLING
COOLING ACCS
ACCS
S E C T ION A
S E C T ION B
SECTION SECTION SECTION
B 3 /5
C
D
WIR ING DIAGRAM FLOW
A55. J 297
Page 56
GATEWAY THERMOSTAT
J 255 P255 BL U
RED YEL WHT WHT RE D PNK GRY GRY RED RED
A55. J 299 RE D- BL K GRY RE D- BL K GRY RED RED
ORN P424 YE L WB- 031
WB- 030
S E NS OR 1 J 261
YEL YEL PNK GRY
123
4
A1 7 3
CT RL S MOKE DE T E CT
J 250 P250
YEL Y
1
YEL
YEL
Y
2
YEL
RED
R
3
PNK
BLK
B
4
GRY
S E NS OR 2
J 252 P252
YEL
Y
YEL
1
YEL
Y
YEL
2
PNK
R
RED
3
GRY
B
BLK
4
4
P251 J 251 YEL
1 YEL
2 RED
3 BLK
4 P253 J 253
1 YEL 2 YEL 3 RED 4 BLK
15 16 17 1 2
F I RE AL ARM CONT ACT S UPPL I E D BY OT HE RS
3
4
361 2
P299
1
A5 5 J 299 123
4
MAI N CT RL
1, 3
1
2
DI - 1
R
9
2 5 6 7 8 9 10
P387 J 387
38
3
F ROM I AQ WI RI NG DI AGRAM
RED 7
1
2
49
10 5 2 7 1 6
R C
DI - 1 G
R W1
C W2 Y1 DI - 2 Y2 OCP R GL O DI - 3
R DO- 1
DI - 4 C
R FREE
C AI - 1 GND S 52 HUM GND GND S 27 T E MP
GND AI - 2
2 4 VAC C
S149 R
I ON GND FREE S GND +
12345678
J 297 P297
9 10
1 2 3 4 5 6 7 8 9 10
123
J 298
J 304
P298
P304
82
A55. J 298
A55. J 298 BL K RED
R C I AQ+ 123
WB- 046 WB- 045 WB- 044
R C I AQ+ 123 WHT GRY
PUR
S HI E L D
TO B5- SECT L OC CC03
APPL I E S ONL Y T O D- BOX
5
US E D ONL Y I N NOVAR L S E GAT E WAY
R I AQ+ I AQ-
C
134
2
5
187
2
1
2
A55. J 298
DE NOT E S OPT I ONAL COMPONE NT S AND WI RI NG
CL AS S 2 F I E L D WI RI NG
J 387
A5 5
J 298 J 297 J 299 J 304
L ONT a l k MODUL E
Model:
Voltage: Supersedes:
LC, LG, LH, LD Series RTU
Thermostat- GATEWAY Controls
All Voltages
538079-01 Form No: 5 3 8 0 7 9 - 0 2 Rev: 0
HE AT ING
COOLING
COOLING ACCS
ACCS
S E C T ION A
S E C T ION B
SECTION SECTION SECTION
B 3 /5
C
D
WIR ING DIAGRAM FLOW
Page 57
ECONOMIZER
MS 7110K
RANGE 2- 10 VDC
RED BL K BRN WHT
NF 24- S R AF 24- S R
RANGE 2- 10 VDC
P3
3
7
9
8
RED GRY RE D- BL K RE D- BL K
1
1, 2
RE D- BL K BLK
RT16 1
P104 4 J 104 1 2
P105 J 105 1 2 3
RE D- BL K BLK
RE D- BL K BLK
GRY RE D- BL K
2 4 VAC GND GND DP OS GND VOT GND RT16 1 8 VDC A7- S GND GND 1 8 VDC A62- S
P384 J 384
8
1 10 3 9 2
A5 5
MAI N CT RL
11
4
12 5 13 6 14 7
RE D- BL K BLK
Model:
Voltage: Supersedes:
LC,LG,LH,LD,SC,SG Series Economizer & Motorized OAD
HTG CLG CLG ACCS ACCS
SEC SEC SEC SEC SEC
A
B
B3
C
D
All Voltages
WIR ING DIAGRAM FLOW
N/A
Form No: 5 3 8 0 7 2 - 0 1 Rev: 2
Page 58
WB- 012 WB- 011 WB- 010 L C/ L H UNI T S ONL Y WB- 012 WB- 011 WB- 010 L C/ L H UNI T S ONL Y WB- 012 WB- 011 WB- 010 L C/ L H UNI T S ONL Y
POWER ENTRY
T E RMI NAL BL OCK
( UNI T POWE RE D GF I OUT L E T NOT OF F E RE D)
T O T B13 L I NE
B- SECT L OC AA07
DI S CONNE CT S WI T CH
( UNI T POWE RE D GF I OUT L E T OPT I ONAL )
T O T B13 L I NE
B- SECT L OC AA07
CI RCUI T BRE AKE R
( UNI T POWE RE D GF I OUT L E T OPT I ONAL )
T O T B13 L I NE
B- SECT L OC AA07
L1 L2 L3
WI RI NG F ROM E L E CT RI C HE AT AS S E MBL I E S I F APPL I CABL E
L1 L2 L3
WI RI NG F ROM E L E CT RI C HE AT AS S E MBL I E S I F APPL I CABL E
L1 L2 L3
WI RI NG F ROM E L E CT RI C HE AT AS S E MBL I E S I F APPL I CABL E
L C/ L H UNI T S IW T H 80 AMP DI S CONNE CT S IW T CH ONL Y. ( NOT PRE S E NT WHE N OPT I ONAL UNI T POWE RE D GF I OUT L E T
I S I NS T AL L E D)
L1 L2 L3
L1 L2 L3
BL U
BL U PNK
PNK
L1 L2 L3
L I NE VOL T AGE F I E L D I NS T AL L E D
F ROM S 117 I F OPT I ONAL UNI T POWE RE D GF I OUT L E T I S I NS T AL L E D.
L1 L2 L3
L I NE VOL T AGE F I E L D I NS T AL L E D
F ROM S 117 I F OPT I ONAL UNI T POWE RE D GF I OUT L E T I S I NS T AL L E D.
OPT I ONAL UNI T POWE RE D GF I OUT L E T S HOWN
NOT E : 120V F I E L D PROVI DE D POWE R S UPPL Y I S RE QUI RE D WHE N UNI T I S E QUI PPE D WI T H OPT I ONAL F I E L D WI RE D GF I OUT L E T ONL Y.
L1 L2 L3
L I NE VOL T AGE F I E L D I NS T AL L E D
L1
T1
Model: Voltage: Supersedes:
L2
WHT
GRN- YE L
BLU
PNK T2
BL K
BL K
GRN- YE L
BRAS S S CRE W GRN
DE NOT E S OPT I ONAL COMPONE NT S AND WI RI NG
SI L VER SCREW
LC, LG, LH, LD Series RTU
Power Entry Options 156 - 360
All Voltages
538103-01 Form No: 5 3 8 1 0 3 - 0 2 Rev: 2
Page 59
WB- 012 WB- 011 WB- 010
POWER ENTRY
T O T B13 L I NE B- SECT L OC AA07
L1 L2 L3
L1 L2 L3
L I NE VOL T AGE F I E L D I NS T AL L E D
OPT I ONAL GF I OUT L E T
120V F I E L D PROVI DE D POWE R S UPPL Y I S RE QUI RE D.
DE NOT E S OPT I ONAL COMPONE NT S AND WI RI NG
Model:
Voltage: Supersedes:
LG, LD Series RTU with SCCR
Power Entry Options 156 - 360
All Voltages
538104-01 Form No: 5 3 8 1 0 4 - 0 2 Rev: 2
538104-02
Rev 2
Page 60
POWER ENTRY
WB- 012 WB- 011 WB- 010
WB- 012 WB- 011 WB- 010
UNI T S W/ E L E CT RI C HE AT
T O T B13 L I NE B- SECT L OC AA07
UNI T S W/ O E L E CT RI C HE AT
T O T B13 L I NE B- SECT L OC AA07
L1 L2 L3
WI RI NG F ROM E L E CT RI C HE AT AS S E MBL I E S
L1 L2 L3
L I NE VOL T AGE F I E L D I NS T AL L E D
L1 L2 L3
L I NE VOL T AGE F I E L D I NS T AL L E D
OPT I ONAL GF I OUT L E T
120V F I E L D PROVI DE D POWE R S UPPL Y I S RE QUI RE D.
DE NOT E S OPT I ONAL COMPONE NT S AND WI RI NG
Model:
Voltage: Supersedes:
LC, LH Series RTU with SCCR
Power Entry Options 156 - 360
All Voltages
538105-01 Form No: 5 3 8 1 0 5 - 0 2 Rev: 2
Page 61
G / J VOLT WITH BY-PASS
K10 K68 GND K149 GND
ORN
GRY
1
A5 5 P394 1 4 3 6 J 394 MAI N CT RL
ORN
1 YEL 2 YEL
1 YEL- BLK YEL- BLK
2 1 YEL
YEL 2 1 YEL- BLK
YEL- BLK 2
5 24VAC 1 HPS W1
6 24VAC 2 HPS W2
7 24VAC 3 L PS W1
8 24VAC 4 L PS W2
P388 J 388
P385 J 385 J 382 P382
1 RE D- BL K GRY
2 1 RE D- BL K
GRY 2
1 RE D- BL K GRY
2
1 RT17 RT6 1 4 GND GND 4
2 RT48 RT46 2 5 GND GND 5
3 RT49 RT47 3 6 GND GND 6
1 RE D- BL K
2
GRY
3
4
RE D- BL K 1
GRY
2
RE D- BL K 1 GRY 2
RE D- BL K 1
21
2
2
3 GRY
3
4 4
1 BL U- BL K
BL U- BL K 2 1 BLU
BLU 2 1 BL U- BL K
BL U- BL K 2 1 BLU
BLU 2
P399 J 399
8 24VAC 4 HPS W4
7 24VAC 3 HPS W3
6 24VAC 2 L PS W4
5 24VAC 1 L PS W3
1 RE D- BL K GRY
2 1 RE D- BL K
GRY 2
P404 J 404 J 401 P401
A1 7 8
AUX CT RL
1 RT52 3 GND
RT50 1 GND 3
2 RT53 4 GND
RT51 2 GND 4
RE D- BL K 1 GRY 2
RE D- BL K 1 GRY 2
ORN GRY
ORN GRY
A5 5 MAI N CTRL
J 390 1
4
P390
2
5
ORN
GRY GND GRY
GRY GND GND
L30
GND
GND
K152 K153
BYPS
ORN K150
GRY GND
GND 2 4 VAC GND
COMP 4
BL U COMP 3
P NK GRY GND
BL U
BL WR/ I ON GND COMP 1 GND COMP 2 GND
2 4 VAC GND MPE / ZBPD 0- 10VDC GND I DB RPM GND
2 4 VAC
GND L 14
2 4 VAC
J 395 1 P395
WB- 008 TO P400 ON A178
WB- 009
RED GRY RE D GRY RED GRY RE D- BL K GRY
2
3
4 J 394 2
5
P394
3
8
2
7 J 381
P381
WB- 038 L OC BB08
RED GRY
RED
GRY
ZONE BYPAS S DAMPE R
CONNE CT I ON,
0- 10VDC ONL Y.
24V PWR S UPPL Y T O
BE F I E L D PROVI DE D.
P431
1
4 PL UG P431 L OCATE D NE AR
CONT ROL BOARD A178.
WB- 039 L OC BB08
MODBUS CABL E W/ RJ - 45
YEL
RED
GRN
P415 213
J 392 4
2
1
3
J 389 1 3
2
4
J 398 1
3
2
P392
P389
P398
F ROM L OC MM0 5
BL U- BL K
YEL GRY YEL- BLK
GRY
WB- 014
GRY WB- 013
F ROM L OC MM0 5 GRN GRY
TO K202 A1
WB- 002 GRN
GRY
OPT I ONAL UVC- L I GHT CONNE CT I ONS F ROM T 49, S E E I AQ DI AGRAM
GRN GRN GRY
GRN WB- 003
TO K202 A2
OPT I ONAL POWE R E XHAUS T F AN
S UPPL Y VOL TAGE
TO F6- L1/ L2 B5- S E CT L OC AA04
WB- 040
WB- 041
RED WB- 016
WHT WB- 015 WHT
WB- 034
US E J UMPE R PROVI DE D I N UVC KI T T O CONNE CT T O L 2
BL K
WHT WB- 033
F ROM K203 B GRY
WB- 003
F ROM K203 A
GRN WB- 002
WB- 021 BRN BL K
WB- 022 BL K
WB- 023 DRNWR DRNWR
P NK
BL U
P NK RE AR MI DDL E F RONT
YEL
L1 L2 L3
BLU
F ROM A12 MODBUS
A- S E CT L OC F F 02
- OR-
A55 HE ADE R 413
PNK
( NOT S HOWN)
YEL
BLU
BL U
YEL
P NK
F ROM T 18 L OC BB04/ 05
123 P246
WB- 032
P NK
12 P422
OPT I ONAL I ONI ZE R WI RI NG. S E E I AQ WI RI NG DI AGRAM.
YEL
BL U
BL U
YEL
YEL
P NK
BL U
YEL
P NK
BL U
YEL
YEL
P NK YEL WB- 012 WB- 011 WB- 010
P NK
P NK
P NK
WB- 039 WB- 038
S E E POWE R E NT RY DI AGRAM I N DI S CONNE CT
BOX F OR DE T AI L S
YEL YEL
RED P NK
GRY RED
BL U
YEL
RED
BL U
YEL
RED
BL U
BL U
YEL
P NK
P NK
RED GRY
RED
YEL
BL U
123 123
P NK
P NK
YEL
YEL
BL U
BL U
1 2 3 J 247 P249
PNK YEL
BL U
YEL
P NK
J 249 1
2
BLU 3
P247
BL U
YEL
P NK
3
YEL
P NK YEL BL U YEL
GRY WB- 008
RED GRY WB- 009
4 J 400 1 2 P400
F ROM T 18
J 397 1
6
P397
4
9
2
7
GRY
ORN
GRN
ORN
GRY
WB- 013 WB- 014 T O L OC E E 04/ 05
DE NOT E S OPT I ONAL COMPONE NT S AND WI RI NG
GRY
ORN
PNK YEL BLU
F ROM F 10
1 PNK PNK
PNK YEL YEL 3 BLU
YEL 2
WB- 001 T O K10, K68, K152, K153, L OC KK08
WB- 004 T O K125/ K262, A- S E CT L OC BB07
WB- 005 T O A3/ A12, A- S E CT L OC BB07
WB- 006 T O B6/ B15, A- S E CT L OC BB07
WB- 007 T O HR6/ HR16, A- S E CT L OC BB07
WB- 037 T O K149, K150, K152, K153, L OC MM09
WB- 030 T O K10, K68, K149, K150, L OC KK08
F ROM F 10
YEL WB- 037
YEL P UR
WB- 030 P UR
WB- 001 YEL
P NK
PNK YEL ORN
1
P NK
YEL
YEL BL U
ORN 1
BLU ORN 1
YEL BL U
ORN 1
P NK
BL U
ORN 1
P NK
BL U
ORN 1
2
2
2
2
2
2
P UR
P UR
P UR
ORN
ORN
ORN
ORN
ORN
ORN
BL K P UR
BL K
BL K
BL K
BL K
BL K
12 P86
3
P47 3 2 1 J 47
45 P86
6
P52 3 2 1 J 52
78 P86
9
P106 3 2 1 J 106
12 P87
3
P107 3 2 1 J 107
45 P87
6
P108 3 2 1 J 108
78 P87
9
P109 3 2 1 J 109
BL U YEL
P NK RED
YEL
P NK
YEL
P NK
YEL
P NK
Model:
LGT, LCT 302, 360 - G, J-VOLT COOLING - MSAV - WITH BYPASS
Voltage: Supersedes:
460V/3~/60Hz (G), 575V/3~/60Hz (J)
N/A
Form No: 5 3 8 3 3 9 -0 1
Rev: 0
W IR IN G HE ATING
DIAG R AM SECTION
FLOW
A
COOLING
S E C T IO N B
COOLING ACCS ACCS
SECTION SECTION SECTION
B 3 /5
C
D
Page 62
G / J VOLT NO BY-PASS
PNK
YEL
BL U
ORN
GRY
1
A5 5 P394
1
4
3
6 J 394
MAI N CT RL
ORN
1 YEL 2 YEL
1 YEL- BLK YEL- BLK
2 1 YEL
YEL 2 1 YEL- BLK
YEL- BLK 2
5 24VAC 1 HPS W1
6 24VAC 2 HPS W2
7 24VAC 3 L PS W1
8 24VAC 4 L PS W2
P388 J 388
P385 J 385 J 382 P382
1 RE D- BL K GRY
2 1 RE D- BL K
GRY 2
1 RE D- BL K GRY
2
1 RT17 RT6 1 4 GND GND 4
2 RT48 RT46 2 5 GND GND 5
3 RT49 RT47 3 6 GND GND 6
1
RE D- BL K
2
GRY
3
4
RE D- BL K 1
GRY
2
RE D- BL K 1 GRY 2
RE D- BL K 1
21
2
2
3 GRY
3
4
4
1 BL U- BL K
BL U- BL K 2 1 BLU
BL U 2 1 BL U- BL K
BL U- BL K 2 1 BLU
BL U 2
P399 J 399
8 24VAC 4 HPS W4
7 24VAC 3 HPS W3
6 24VAC 2 L PS W4
5 24VAC 1 L PS W3
1 RE D- BL K GRY
2 1 RE D- BL K
GRY 2
GRY GND GND GRY
L30
GND
L14
COMP 4
BL U COMP3
GRY GND
GRY GND
COMP2
BL WR/ I ON GND COMP1 GND
MPE / ZBPD 0- 10VDC GND I DB RPM GND
RED 2 4 VAC
GRY GND
2 4 VAC
GND
2 4 VAC
J 395 1
2
3
P395
4 J 394 2
5
P394
J 381 3
8
2
7
P381
J 392 4
2
1
3
J 389 1
3
2
4
J 398 1
3
2
P392
P389
P398
BL U- BL K
WB- 008
TO P400 ON A178
WB- 009
RED
GRY
RED
WB- 038 L OC BB08
RED GRY
RED
GRY
RE D- BL K GRY
3 P431
1
1
2
WB- 039 L OC BB08
MODBUS CABL E W/ RJ - 45
5 PL UG P431 L OCAT E D NE AR CONT ROL BOARD A178.
WB- 043
GRY RE D- BL K
4
WB- 042
TO B5- SECT L OC AA01 VF D POWE R E XHAUS T
WB- 032
2
1
WB- 033 P422
OPT I ONAL I ONI ZE R WI RI NG. S E E I AQ WI RI NG DI AGRAM.
OPT I ONAL UVC- L I GHT CONNE CT I ONS F ROM T 49, S E E I AQ DI AGRAM
BL K WHT YEL GRY
YEL- BLK
OPT I ONAL POWE R E XHAUS T F AN
S UPPL Y VOL T AGE
TO F6- L1/ L2 B5- S E CT L OC AA04
WB- 040
WB- 041
YEL
RED
GRN
P415 213
US E J UMPE R PROVI DE D I N UVC KI T T O CONNE CT T O L 2
WB- 021 BRN BL K
WB- 022 BL K
WB- 023 DRNWR DRNWR
PNK
BL U
PNK RE AR MI DDL E F RONT
YEL
L1 L2 L3
BL U
F ROM A12 MODBUS
A- S E CT L OC F F 02
- OR-
A55 HE ADE R 413
PNK
( NOT S HOWN)
YEL
BL U
BL U
YEL
PNK
F ROM T 18 L OC BB04/ 05
123 P246
PNK
PNK
PNK
WB- 039 WB- 038
S E E POWE R E NT RY DI AGRAM I N DI S CONNE CT
BOX F OR DE T AI L S
BL U
YEL
YEL
PNK
BL U
YEL
PNK
BL U
YEL
YEL
PNK YEL WB- 012 WB- 011 WB- 010
YEL YEL
RED PNK
GRY RED
BL U
YEL
RED
BL U
YEL
RED
BL U
RED GR Y
RED
123 123
PNK
YEL
BL U
123 123
P247 P423
RED WB- 016
WHT WB- 015 WHT
WB- 034 PNK BL U PNK YEL BL U
YEL
PNK YEL BL U YEL
P404 J 404 J 401 P401
GRY ORN K149 GRY GND
ORN GRY GND
A1 7 8
AUX CT RL
1 RT52 3 GND
RT50 1 GND 3
2 RT53 4 GND
RT51 2 GND 4
RE D- BL K 1 GRY 2
RE D- BL K 1 GRY 2
ORN
A5 5 MAI N CTRL
K68
K10
J 390 1
4
P390
2
5
GND 2 4 VAC GND
GRY WB- 008
RED GRY WB- 009
GND
GRY GND
ORN K150
4 J 400 1 2 P400
GND A3 0 2 4 VAC
A5 5
MAI N CT RL
J 378 3
1
2
P378
K152 K153
A1 7 8
AUX CT RL
J 397 1
6
2
7
P397
GRY
ORN
FI ELD PROVI DE D
WI RI NG F ROM T 18
7
OPT I ONAL POWE R E XHAUS T BL OWE R S UPPL Y VOL T AGE 1234 P69
6
GRN- YE L
PNK YEL BL U
F ROM F 10
ORN
1 PNK PNK
PNK YEL YEL
3 BLU
YEL YEL 2
WB- 001 T O K10, K68, K152, K153, L OC KK08
WB- 004 T O K125/ K262, A- S E CT L OC BB07
WB- 005 T O A3/ A12, A- S E CT L OC BB07
WB- 006 T O B6/ B15, A- S E CT L OC BB07
WB- 007 T O HR6/ HR16, A- S E CT L OC BB07
WB- 037 T O K149, K150, K152, K153, L OC MM09
WB- 030 T O K10, K68, K149, K150, L OC KK08
F ROM F 10
ORN
GRY
GRY
DE NOT E S OPT I ONAL COMPONE NT S AND WI RI NG
WB- 037
YEL PUR
WB- 030 PUR
WB- 001 YEL
PNK
PNK YEL ORN
1
PNK
YEL
YEL BL U
ORN 1
BLU ORN 1
YEL BL U
ORN 1
PNK
BL U
ORN 1
PNK
BL U
ORN 1
2
2
2
2
2
2
PUR
PUR
PUR
ORN
ORN
ORN
ORN
ORN
ORN
BL K PUR
BL K
BL K
BL K
BL K
BL K
12 P86
3
P47 3 2 1 J 47
45 P86
6
P52 3 2 1 J 52
78 P86
9
P106 3 2 1 J 106
12 P87
3
P107 3 2 1 J 107
45 P87
6
P108 3 2 1 J 108
78 P87
9
P109 3 2 1 J 109
BL U YEL
PNK RED
YEL
PNK
YEL
PNK
YEL
PNK
Model:
LGT, LCT 302, 360 - G, J-VOLT COOLING - MSAV NO BYPASS -OR- VAV
Voltage: Supersedes:
460V/3~/60Hz (G), 575V/3~/60Hz (J)
N/A
Form No: 5 3 8 3 4 0 -0 1
Rev: 0
W IR IN G HE ATING
DIAG R AM SECTION
FLOW
A
COOLING
S E C T IO N B
COOLING ACCS ACCS
SECTION SECTION SECTION
B 3 /5
C
D
Page 63
Y VOLT WITH BY-PASS
K10 K68 GND K149 GND
ORN
GRY
1
A5 5 P394 1 4 3 6 J 394 MAI N CT RL
ORN
1 YEL 2 YEL
1 YEL- BLK YEL- BLK
2 1 YEL
YEL 2 1 YEL- BLK
YEL- BLK 2
5 24VAC 1 HPS W1
6 24VAC 2 HPS W2
7 24VAC 3 L PS W1
8 24VAC 4 L PS W2
P388 J 388
P385 J 385 J 382 P382
1 RE D- BL K GRY
2
1 RE D- BL K GRY
2
1 RE D- BL K GRY
2
1 RT17 RT6 1 4 GND GND 4
2 RT48 RT46 2 5 GND GND 5
3 RT49 RT47 3 6 GND GND 6
1 RE D- BL K
2
GRY
3
4
RE D- BL K 1
GRY
2
RE D- BL K 1 GRY 2
RE D- BL K 1
21
2
2
3 GRY
3
4 4
1 BL U- BL K
BL U- BL K 2 1 BLU
BLU 2 1 BL U- BL K
BL U- BL K 2 1 BLU
BLU 2
P399 J 399
8 24VAC 4 HPS W4
7 24VAC 3 HPS W3
6 24VAC 2 L PS W4
5 24VAC 1 L PS W3
1 RE D- BL K GRY
2 1 RE D- BL K
GRY 2
P404 J 404 J 401 P401
A1 7 8
AUX CT RL
1 RT52 3 GND
RT50 1 GND 3
2 RT53 4 GND
RT51 2 GND 4
RE D- BL K 1 GRY 2
RE D- BL K 1 GRY 2
ORN GRY
ORN GRY
A5 5 MAI N CTRL
J 390 1
4
P390
2
5
ORN
GRY GND GRY
GRY GND GND
L30
GND
GND
K152 K153
BYPS
ORN K150
GRY GND
GND 2 4 VAC GND
COMP 4
BLU COMP 3
PNK GRY GND
BLU
GRY GND
COMP 2
BL WR/ I ON GND COMP 1 GND
2 4 VAC GND MPE / ZBPD 0- 10VDC GND I DB RPM GND
2 4 VAC
L14 GND
2 4 VAC
J 395 1 P395
WB- 008 TO P400 ON A178
WB- 009
RED GRY RE D GRY RED GRY RE D- BL K GRY
2
3
4 J 394 2
5
P394
3
8
2
7 J 381
P381
WB- 038 L OC BB08
RED GRY
RED
GRY
ZONE BYPAS S DAMPE R
CONNE CT I ON,
0- 10VDC ONL Y.
24V PWR S UPPL Y T O
BE F I E L D PROVI DE D.
P431
1
4 PL UG P431 L OCAT E D NE AR
CONT ROL BOARD A178.
WB- 039 L OC BB08
MODBUS CABL E W/ RJ - 45
F ROM K203 A
YEL
RED
GRN
GRN WB- 002
WB- 021 BRN BLK
WB- 023 DRNWR DRNWR
UVC- L I GHT POWE R: US E DUAL CONNE CT OR PROVI DE D I N KI T. S E E I AQ DI AGRAM.
L1 L2 L3
BL U
YEL
RE AR
PNK
MI DDL E
F RONT
5
PNK YEL BL U
BLU
PNK
WB- 022 BL K
P415
5
213
F ROM A12 MODBUS A- S E CT L OC F F 02
- ORA55 HE ADE R 413
( NOT S HOWN)
BLU
YEL
PNK
F ROM T 18 L OC BB04/ 05
123 P246
PNK YEL WB- 012 WB- 011 WB- 010
PNK
PNK
PNK
WB- 039 WB- 038
S E E POWE R E NT RY DI AGRAM I N DI S CONNE CT
BOX F OR DE T AI L S
F ROM K203 B GRY
WB- 003
WB- 033
WB- 032
PNK
YEL
J 392 4
2
1
3
P392
F ROM L OC MM0 5
J 389 1
3
P389
YEL GRY
WB- 014
GRY
GRN
MM0 5
WB- 013 F ROM L OC
GRY
TO K202 A1
WB- 002 GRN
GRY
GRN WB- 003
TO K202 A2
GRY
GRN
GRN
WHT
BLK
12 P422
OPT I ONAL I ONI ZE R WI RI NG. S E E I AQ WI RI NG DI AGRAM.
BLU
PNK
PNK
YEL
RED
BLU
YEL
RE D
PNK YEL BL U
YEL
BL U
RED
123 123
RED
PNK
PNK
YEL
YEL
BLU
BLU
123
J 247 P249
PNK YEL BL U
3
PNK
PNK
L1 L2 L3
Model:
LGT, LCT 302, 360 - Y-VOLT COOLING - MSAV WITH BYPASS
YEL BL U
YEL
BLU
YEL
YEL- BLK
PNK
RED
2
4
J 398 1
3
P398
2
4 J 400 1 2
P400
BL U- BL K
OPT I ONAL POWE R E XHAUS T F AN
S UPPL Y VOL T AGE
TO F6- L1/ L2 B5- S E CT L OC AA04
WB- 040
WB- 041
F ROM T 18
GRY WB- 008
RED GRY WB- 009
J 397 1
6
P397
4
9
2
7
GRY
ORN
GRN
ORN
GRY
WB- 013 WB- 014 T O L OC E E 04/ 05
DE NOT E S OPT I ONAL COMPONE NT S AND WI RI NG
GRY
ORN
YEL
PNK
PNK YEL BLU YEL
BLU
YEL
YEL
PNK
BLU
YEL
PNK YEL BLU
F ROM F 10
1 PNK PNK
PNK YEL YEL
3 BLU
YEL YEL 2
WB- 001 T O K10, K68, K152, K153, L OC KK08
WB- 004 T O K125/ K262, A- S E CT L OC BB07
WB- 005 T O A3/ A12, A- S E CT L OC BB07
WB- 006 T O B6/ B15, A- S E CT L OC BB07
WB- 007 T O HR6/ HR16, A- S E CT L OC BB07
WB- 037 T O K149, K150, K152, K153, L OC MM09
WB- 030 T O K10, K68, K149, K150, L OC KK08
F ROM F 10
WB- 037
YEL PUR
WB- 030 PUR
WB- 001 YE L
PNK
PNK YEL ORN
1
PNK
YEL
YEL BL U
ORN 1
BLU ORN 1
YEL BLU
ORN 1
PNK
BLU
ORN 1
PNK
BLU
ORN 1
2
2
2
2
2
2
PUR
PUR
PUR
ORN
ORN
ORN
ORN
ORN
ORN
BLK PUR
BLK
BLK
BLK
BLK
BLK
12 P86
3
P47 3 2 1 J 47
45 P86
6
P52 3 2 1 J 52
78 P86
9
P106 3 2 1 J 106
12 P87
3
P107 3 2 1 J 107
45 P87
6
P108 3 2 1 J 108
78 P87
9
P109 3 2 1 J 109
BLU YEL
YEL
PNK RED
BLU
YEL
RED
BLU
YEL
PNK
YEL
Voltage: Supersedes:
208-240V/3~/60Hz (Y)
N/A
Form No: 5 3 8 3 3 4 -0 1
Rev: 0
W IR IN G HE ATING
DIAG R AM SECTION
FLOW
A
COOLING
S E C T IO N B
COOLING ACCS ACCS
SECTION SECTION SECTION
B 3 /5
C
D
YEL
Page 64
Y VOLT NO BYPASS
ORN
GRY
P394
J 394 1
4
3
6
ORN
P388 J 388
1 YEL 2 YEL
1 BLU BL U
2 1 YEL
YEL 2 1 BLU
BL U 2
A5 5
MAI N CT RL 5 24VAC 1 HPS W1
6 24VAC 2 HPS W2
7 24VAC 3 L PS W1
1 RE D- BL K GRY
2
1 RE D- BL K GRY
2
1 RE D- BL K GRY
2
8 24VAC 4 L PS W2
DE F ROS T CONT ROL
RT 48- S E NS OR, COND COI L 1
RT 49- S E NS OR, COND COI L 2
1 RT17 RT6 1 4 GND GND 4
2 RT48 RT46 2 5 GND GND 5
3 RT49 RT47 3 6 GND GND 6
GRY GND GND GRY
MPE / ZBPD 0- 10VDC GND I DB RPM GND
L2
GND
L1
RE D 2 4 VAC
GRY GND
2 4 VAC
GND
2 4 VAC
J 395 1
2
3
P395
4 J 394 2
5
J 381 3
8
2
7
J 392 4
2
1
3
P394
P381
P392
J 391 1
2
P391
RE D- BL K GRY
WB- 008
TO P400 ON A178
WB- 009
RED
GRY
RED
WB- 038 L OC BB08
RED GRY
RED
GRY
3
1 2
P431
WB- 039 L OC BB08
MODBUS CABL E W/ RJ - 45
5 PL UG P431 L OCAT E D NE AR CONT ROL BOARD A178.
WB- 043
2
GRY RE D- BL K
TO B5- SECT L OC AA01 VF D POWE R E XHAUS T
WB- 042
4
WB- 032 BLK
WB- 033
WH T
1 P422
OPT I ONAL I ONI ZE R WI RI NG. S E E I AQ WI RI NG DI AGRAM.
YEL
RED
GRN
WB- 021 BRN BLK
WB- 023 DRNWR DRNWR
UVC- L I GHT POWE R: US E DUAL CONNE CT OR PROVI DE D I N KI T. S E E I AQ DI AGRAM.
L1 L2 L3
BL U
YEL
RE AR
PNK
MI DDL E
F RONT
2
PNK YEL BL U
BLU
PNK
P415 213
2
F ROM A12 MODBUS A- S E CT L OC F F 02
- ORA55 HE ADE R 413
( NOT S HOWN)
WB- 022 BL K
BLU
YEL
PNK
F ROM T 18 L OC BB04/ 05
123 P246
12
ORN GRY
PNK BLU PNK YEL BL U
BL WR/ I ON GND L34 S OL E NOI D, 2- S T G COMPR 1 GND COMP1 GND COMP2 GND K10 K68 GND K149 GND
P385 J 385 J 382 P382
1 RE D- BL K
2
GRY
3
4
RE D- BL K 1
GRY
2
RE D- BL K 1 GRY 2
RE D- BL K 1
11
2
2
3 GRY
3
4 4
CONT ROL BOARD ARRANGE ME NT
E VAPORAT OR COI L F RE E ZE PROT E CT I ON
RT 46- S E NS OR, E VAP COI L 1
RT 47- S E NS OR, E VAP COI L 2
J 389 1
3
2
4 J 390 1
4
P389
P390
2
5
A1 7 8
AUX CT RL
J 397 1
6
P397
ORN K150
YEL GRY
BLU GRY ORN ORN GRY GRY ORN GR Y
OPT I ONAL POWE R E XHAUS T F AN
S UPPL Y VOL T AGE
TO F6- L1/ L2 B- 5 S E CT L OC AA04
WB- 040
WB- 041
1234
OPT I ONAL POWE R E XHAUS T BL OWE R S UPPL Y VOL T AGE
P69
GRN- YE L
PNK
PNK
6
PNK
YEL
YEL
BLU
YEL
PNK
YEL
1 23
PNK YEL BLU YEL PNK YEL BLU YEL
GRY GND
ORN
ORN
K152 K153
GRY WB- 008 RED 2 4 VAC GRY GND WB- 009
DE NOT E S OPT I ONAL COMPONE NT S AND WI RI NG
GND
2
7
J 400 1 2
P400
GRY
GRY
F ROM T 18 L OC BB05
ORN
WB- 005 DUAL F UE L UNI T S ONL Y: T O A3/ A12, A- S E CT L OC BB07
WB- 004 DUAL F UE L UNI T S ONL Y: OPT I ONAL L OW AMBI E NT VE S T I BUL E HE AT E R KI T . T O K125/ K262, A- S E CT L OC BB07
WB- 006 DUAL F UE L UNI T S ONL Y: T O B6/ B15, A- S E CT L OC BB07
WB- 007 DUAL F UE L UNI T S ONL Y: OPT I ONAL L OW AMBI E NT VE S T I BUL E HE AT E R KI T HR6/ HR16, A- S E CT L OC BB07
PNK YEL WB- 012 WB- 011 WB- 010
BL U
YEL
PNK
PNK
PNK
PNK
WB- 039 WB- 038
BLU BLU
PNK PNK YEL BL U PNK YEL BL U
S E E POWE R E NT RY DI AGRAM I N DI S CONNE CT
BOX F OR DE T AI L S
GRY RED
RED GRY
RED
123 123
PNK
YEL
BLU
123 123
P247 P423
PNK
YEL
BLU
YEL PNK YEL
BL K PUR
BL K PUR
BL K PUR
BL K PUR
BL K PUR
BL K PUR
PNK YEL
PNK YEL YEL BL U
ORN 1
ORN 1
ORN 1
ORN 1
ORN 1
ORN 1
2
2
2
2
2
2
ORN
ORN
ORN
ORN
ORN
ORN
12 P86
3
P47 3 2 1 J 47
45 P86
6
P52 3 2 1 J 52
78 P86
9
P106 3 2 1 J 106
12 P87
3
P107 3 2 1 J 107
45 P87
6
P108 3 2 1 J 108
78 P87
9
P109 3 2 1 J 109
YEL BL U
PNK BL U
PNK BL U
BAS I C RT U L AYOUT
B22 B4
B3
B23 B5
B1 B2 B24 B21
Model:
LHT, LDT 302 - Y-VOLT COOLING - MSAV- NO BYPASS
Voltage: Supersedes:
208-240V/3~/60Hz (Y)
N/A
Form No: 5 3 8 3 5 4 -0 1
Rev: 0
W IR IN G HE ATING
DIAG R AM SECTION
FLOW
A
COOLING
S E C T IO N B
COOLING ACCS ACCS
SECTION SECTION SECTION
B3
C
D
Page 65
SEQUNCE OF OPERATION LCT302 - 360
POWER:
1- Line voltage from TB2, unit disconnect S48, or other factory or field installed optional power disconnects, such as CB10, energizes transformer T1 and T18. Transformer T1 provides 24VAC power to the A55 Unit Controller and T18 provides 24VAC power to A178 Compressor 3 and 4 Controller. The two controllers provide 24VAC power to the unit cooling, heating and blower controls and thermostat.
2- Terminal block TB13 is also energized when the unit disconnect closes. TB13 supplies line voltage to compressor crankcase heaters, compressors, blower motors and fan motors.
BLOWER OPERATION (OCP INPUT MUST BE ON):
3- The A55 Unit Controller receives a demand from thermostat terminal G. A55 energizes blower contactor K3 with 24VAC. On VFD units, A55 energizes relay K203.
4- N.O. K3-1 closes, energizing blower B3. On VFD units, N.O. K203-2 closes, sending a signal to the inverter, A96, to start forward rotation. P259 pin #4 sends a 0 -10VDC signal to A96 to control blower B3 speed.
POWER EXHAUST FANS/BLOWERS:
5- The A55 Unit Controller receives a demand and energizes exhaust fan relay K65 OR exhaust blower contactor K205 or exhaust blower relay K207.
1ST STAGE COOLING (B1 AND B2 ARE ENERGIZED):
6- First stage cooling demand energizes Y1 and G in the thermostat. G energizes blower, if blower is not already running (see step 3).
7- 24VAC is routed to the A55 Unit Controller. After A55 proves N.C. low pressure switch S87 and S88, N.C. freezestat S49 and S50 and N.C. high pressure switch S4 and S7, compressor contactors K1 and K2 are energized.
8- N.O. contacts K1-1 and K2-1 close energizing compressor B1 and B2.
9- A55 Unit Controller and A178 Controller energize fan contactor K10, K68, and K149 based on low ambient switch S11 and S84 inputs and predefined control logic.
10-N.O. contact K10-1, K68-1, K149-1 close energizing fan B4, B5 and B21 respectively.
11- N.C. Contacts K1-2 and K2-2 open de-energizing compressor 1 and 2 crankcase heater HR1 and HR2.
2ND STAGE COOLING:
12- Second stage cooling demand energizes Y2.
13-24VAC is routed to A178 Compressor 3 and 4 Controller. After A178 proves N.C. low pressure switches S98 and S97, N.C. freezestats S53 and S95 and N.C. high pressure switches S28 and S96, compressor contactors K14 and K146 are energized.
14- N.O. contacts K14-1 close energizing compressor B13.
15- N.O. contacts K146-1 close energizing compressor B20.
16- A178 Controller energizes fan contactor K150, K152, K153 based on low ambient switch S85 and S94 inputs and predefined control logic.
17-N.O. contacts K150-1, K152-1 and K153-1 close energizing condenser fan B22, B23 and B24 respectively.
18-N.C contacts K14-2 and K146-2 open de-energizing compressor 3 and 4 crankcase heater HR5 and HR11.
Page 66
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