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PKG-SVX14A-EN 09012007

Installation, Operation, and Maintenance
Midrange Self-Contained Units

Models SCWH/SCRH 3, 5, 7.5, 10, 12, & 15-tons
"AO" and later design sequence

September 2007

PKG-SVX14A-EN

general information

About This Manual Literature Change History
Use this manual for commercial selfcontained models SCWH and SCRH. This is the original issue of this manual. It provides specific installation, owner maintenance, and diagnostic troubleshooting instructions for "AO" and later design sequences.
Note: The procedures discussed in this manual should only be performed by qualified, experienced HVAC technicians.
Note: This document is customer property and must be retained for use by maintenance personnel.
It is important to perform periodic maintenance to help ensure trouble free operation. Should equipment failure occur, contact a qualified Trane service organization for an experienced HVAC technician to properly diagnose and repair this equipment.
Warnings and Cautions
Warnings and cautions appear at appropriate sections throughout this manual. Read these carefully.
WARNING Indicates a potentially hazardous situation, which could result in death or serious injury if not avoided.

CAUTION Indicates a potentially hazardous situation, which may result in minor or moderate injury if not avoided. Also, it may alert against unsafe practices.
CAUTION Indicates a situation that may result in equipment or property-damage-only accidents.
Example Warnings and Cautions
WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing.Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
CAUTION Use Copper Conductors Only! Unit terminals are not designed to accept other type conductors. Failure to use copper conductors may result in equipment damage.

Common HVAC Acronyms For convenience, a number of acronyms and abbreviations are used throughout this manual. These acronyms are alphabetically listed and defined below. CFM = Cubic-feet-per-minute CKT. = Circuit CV = Constant volume CW = Clockwise CCW = Counterclockwise E/A = Exhaust air F/A = Fresh air HGBP = Hot gas bypass HVAC = Heating, ventilation and air conditioning IGV = Inlet guide vanes I/O = Inputs/outputs IOM= Installation/operation/maintenance manual LH = Left-hand O/A = Outside air psig = Pounds-per-square-inch, gauge pressure R/A = Return air RH = Right-hand RPM = Revolutions-per-minute S/A = Supply air SZ = Single-zone (unit airflow) VAV = Variable air volume w.c. = Water column
Special Note on Refrigeration Emissions
World environmental scientists have concluded that ozone in our upper atmosphere is being reduced due to the release of CFC fully halogenated compounds.
Trane urges all HVAC service personnel to make every effort to prevent any refrigerant emissions while installing, operating, or servicing equipment. Always conserve refrigerants for continued use.

PKG-SVX14A-EN

contents
Cross reference to related publications/information: Midrange Self-Contained catalog, PKG-PRC012-EN
Installation.........................................................2
general information ...................................................2 pre-installation considerations ....................................6 dimensions & weights .............................................11 mechanical requirements ..........................................17 electrical requirements .............................................19 installation procedure .............................................21 pre-startup requirements ..........................................22 startup ..................................................................23
Operation.........................................................24
sequence of operation .............................................24
Maintenance ...................................................25
general information ................................................25 maintenance procedures ..........................................26 periodic checklists ...................................................29 troubleshooting ......................................................30 typical wiring diagrams ..........................................32

PKG-SVX14A-EN

Installation

general information

Midrange Model Number Description
Following is a complete description of the midrange model number. Each digit in the model number has a corresponding code that identifies specific unit options.

S C W H 075 4 2 A0 1 0 1 0 1 2 3 4 567 8 9 1011 12 13 14 15

Digit 1 - unit model S = self contained
Digit 2 - unit type C = commercial
Digit 3 - condenser medium R = remote air-cooled W = water cooled
Digit 4 - development sequence H = development series
Digit 5, 6, 7- unit nominal capacity 030 = 3 tons 050 = 5 tons 075 = 7.5 tons 100 = 10 tons 120 = 12 tons 150 = 15 tons

Digit 8 - unit voltage 3 = 208 - 230 volt/60 hz/3 ph 4 = 460 volt/60 hz/3 ph 5 = 575 volt/60 hz/3 ph
Digit 9 - air flow configuration 2 = vertical discharge / front return 3 = vertical discharge / rear return
Digit 10, 11 - design sequence A0 = design sequence
Digit 12 - air filter type 1 = one-inch fiberglass throwaway
Digit 13 - control 0 = control interface

Digit 14 - unit finish 1 = painted 2 = corrosion resistant coating
Digit 15 - coil finish/Cu-Ni Condenser 0 = none E = evaporator coated (SCRH) J = Cupronickel condenser &
Evaporator coated (SCWH)

Unit Airflow Configurations

unit size 030/050/075
100/120/150

discharge
vertical CCW horizontal CW
vertical CCW
vertical CW horizontal CW vertical CW horizontal CW horizontal CCW

fan location
top top
top
top top rear rear rear

comments standard field converted standard field converted

PKG-SVX14A-EN

Installation

general information

General
The midrange models SCWH/SCRH is a high efficiency, vertical air condioner. units have either front or top discharge configuration options and easy service access. Unit construction is heavy gage steel with a baked enamel finish. Available unit voltages are 208/3/60, 230/ 3/60, 460/3/60, and 575/3/60.
Refrigeration Circuits Units are configured in single or double refrigeration circuits. Each circuit consists of: · high efficiency scroll compressor
mounted on rubber isolation grommets · evaporator coils designed for optimum
performance and efficiency with lanced fins and rifled tubing · filter-drier
Evaporator Section The evaporator fan section consists of one or two forward curved centrifugal fans powered by a premium efficiency motor through an adjustable motor sheave and fixed diameter blower pulley.
Controls The standard control panel consists of a high voltage terminal block, overload relays for each fan motor, transformer, 3pole 24-volt contactors for eachmotor and compressor, and a 5-second delay timer. Remote thermostat controls are field installed.
Field-Installed Accesories These items ship separately for field installation: · steam coil · hot water coil · plenum · oversized motors · remote thermostat
Note: Application of the above options and/or accessories may require field adjustment of fan speeds to ensure proper airflow and performance.
Unit Nameplate The unit nameplate identifies the unit model number, appropriate service literature, and wiring diagrm numbers. It is mounted on the control panel door. Reference this information when making inquires or ordering parts or literature.

Refrigerant Handling Procedures
Environmental Accountability Policy Trane urges that all HVAC servicers to make every effort to eliminate, if possible, or vigorously reduce the emission of CFC, HCFC, and HFC refrigerants to the atmosphere. Always act in a responsible manner to conserve refrigerants for continued usage even when acceptable alternatives are available.
Recover and Recycle Refrigerants Never release refrigerant to the atmosphere! Always recover and/or recycle refrigerant for reuse, reprocessing (reclaimed), or properly dispose if removing from equipment. Always determine the recycle or reclaim requirements of the refrigerant before beginning the recovery procedure. Obtain a chemical analysis of the refrigerant if necessary. Questions about recovered refrigerant and acceptable refrigerant quality standards are addressed in ARI Standard 700.
Refrigerant Handling and Safety Consult the manufacturer's material safety data sheet (MSDS) for information on refrigerant handling to fully understand health, safety, storage, handling, and disposal requirements. Use the approved containment vessels and refer to appropriate safety standards. Comply with all applicable transportation standards when shipping refrigerant containers.
Service Equipment and Procedures To minimize refrigerant emissions while recovering refrigerant, use the manufacturer's recommended recycling equipment per the MSDS. Use equipment and methods which will pull the lowest possible system vacuum while recovering and condensing refrigerant. Equipment capable of pulling a vacuum of less than 1,000 microns of mercury is recommended.
Do not open the unit to the atmosphere for service work until refrigerant is fully removed/recovered. When leak-testing with trace refrigerant and nitrogen, use HCFC-22 (R-22) rather than CFC-12 (R12) or any other fully-halogenated refrigerant . Be aware of any new leak test methods which may eliminate

refrigerants as a trace gas. Perform evacuation prior to charging with a vacuum pump capable of pulling a vacuum of 1,000 microns of mercury or less. Let the unit stand for 12 hours and with the vacuum not rising above 2,500 microns of mercury.
A rise above 2,500 microns of mercury indicates a leak test is required to locate and repair any leaks. A leak test is required on any repaired area.
Charge refrigerant into the equipment only after equipment does not leak or contain moisture. Reference proper refrigerant charge requirements in the maintenance section of this manual to ensure efficient machine operation. When charging is complete, purge or drain charging lines into an approved refrigerant container. Seal all used refrigerant containers with approved closure devices to prevent unused refrigerant from escaping to the atmosphere. Take extra care to properly maintain all service equipment directly supporting refrigerant service work such as gauges, hoses, vacuum pumps, and recycling equipment .
When cleaning system components or parts, avoid using CFC-11 (R-11) or CFC113 (R-113). Use only cleaning-solvents that do not have ozone depletion factors. Properly dispose of used materials. Refrigeration system cleanup methods using filters and driers are preferred. Check for leaks when excessive purge operation is observed.
Keep abreast of unit enhancements, conversion refrigerants, compatible parts, and manufacturer's recommendations that will reduce refrigerant emissions and increase equipment operating efficiencies.

PKG-SVX14A-EN

Installation

pre-installation considerations

Pre-Installation Considerations
Pre-Installation Checklist Complete the following checklist before beginning unit installation. Verify the unit size and tagging with the
unit nameplate. Make certain the floor or foundation is
level, solid, and sufficient to support the unit and accessory weights. Level or repair the floor before positioning the unit if neccesary. Allow minimum recommended clearances for routine maintenance and service. Refer to unit submittals for dimensions. Allow three fan diameters above the unit for the discharge ductwork. Return air enters the rear of the unit and conditioned supply air discharges through the top. Electrical connection knockouts are on the top, left side of the unit. Allow adequate space for piping access and panel removal. Condenser water piping, refrigerant piping, and condensate drain connections are on the lower left end panel. Electrical supply power must meet specific balance and voltage requirements as described in the "Electrical Requirements" section. Water-cooled units only: The installer is responsible for providing a condenser main, standby water pump, cooling tower, pressure gauges, strainers, and all components for waterside piping. See the "Water Piping" section for general waterside recommendations. Air-cooled units only: The installer is responsible for providing and installing the remote air-cooled condenser and refrigerant piping, including filter driers.
Receiving and Handling
Shipping Package Midrange units ship assembled on skids. Units ship assembled, piped, and charged with either R410a (model SCWH) or a dry nitrogen charge (model SCRH).

Receiving Checklist Complete the following checklist immediately after receiving unit shipment to detect possible shipping damage. Inspect individual cartons before
accepting. Check for rattles, bent carton corners, or other visible indications of shipping damage. If a unit appears damaged, inspect it immediately before accepting the shipment. Make specific notations concerning the damage on the freight bill. Do not refuse delivery. Inspect the unit for concealed damage before it is stored and as soon as possible after delivery. Report concealed damage to the freight line within the allotted time after delivery. Check with the carrier for their allotted time to submit a claim. Do not move damaged material from the receiving location. It is the receiver's responsibility to provide reasonable evidence that concealed damage did not occur after delivery. Do not continue unpacking the shipment if it appears damaged. Retain all internal packing, cartons, and crate. Take photos of damaged material if possible. Notify the carrier's terminal of the damage immediately by phone and mail. Request an immediate joint inspection of the damage by the carrier and consignee. Notify your Trane representative of the damage and arrange for repair. Have the carrier inspect the damage before making any repairs to the unit.
Unit Storage Take precautions to prevent condensate from forming inside the electrical compartments and motors if the unit is stored before it is installed.

Service Access Maintain adequate clearances around and above the unit to ensure proper unit operationa nd allow sufficient service accesss. Trane recommends 36-inches service access on all sides fo the unit. Service access locations are shown in figures on pages 8 through 9.
WARNING
Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
Installation Preparation
Before installing the unit, perform the following procedures to ensure proper unit operation. 1. Verify the floor or foundation is level.
Shim or repair as necessary. To ensure proper unit operation, install the unit level in both horizontal axes. 2. Allow adequate service and code clearances as recommended in "Service Access" section. Position the unit and skid assembly in its final location. Test lift the unit to determine exact unit balance and stability before hoisting it to the installation location. See the "Proper Lifting Procedure" section for proper rigging procedures and cautions. 3. Remove the skids from under the unit. If you find internal damage, file a claim immediately to the delivering carrier. 4. Remove the protective shipping covers from the unit. 5. Verify the compressor isolator shipping brackets are removed and the isolators are properly tightened for operation.

PKG-SVX14A-EN

Installation

pre-installation considerations

Service Access
3 through 7.5-ton SCRH/SCWH

LATCH

THIS PANEL GOES TO TOP ON HORIZONTAL AIR DISCHARGE CONFIGURATION
HEATER ACCESS
PROVIDED DISASSEMBLED (FOR FIELD-INSTALLED REAR RETURN)

3 through 15-ton SCWH/SRCH with top-mounted fan configuration

FAN ACCESS 24"
24"
COIL / ELECTRIC HEATER ACCESS

FRONT RETURN

MOTOR / DRIVE ACCESS (RIGHT SIDE)

AIR FILTER ACCESS (BOTH SIDES)
DRAIN CONNECTION (BOTH SIDES)
26" SERVICE CLEARANCE LEFT SIDE

CONTROL BOX & CONDENSER FAN ACCESS

TXV ACCESS (RIGHT SIDE)

UNIT-MOUNTED T-STAT OPENING (BOTH SIDES)

26" SERVICE CLEARANCE RIGHT SIDE
42" SERVICE CLEARANCE FRONT

POWER ENTRY (BOTH SIDES)
CONTROL ENTRY (BOTH SIDES)

COMPRESSOR ACCESS

26" SERVICE CLEARANCE LEFT SIDE

26" SERVICE CLEARANCE RIGHT SIDE
18" SERVICE CLEARANCE REAR REAR RETURN

SIGHT GLASS/FILTER DRIER ACCESS (RIGHT SIDE)

PKG-SVX14A-EN

Installation
Service Access
10 through 15-ton SCRH/SCWH

pre-installation considerations

10, 12, & 15-ton SCWH/SRCH with side-mounted fan configuration, field converted
8

PKG-SVX14A-EN

Installation

pre-installation considerations

Isolator Placement
Note: Isolators are field-provided.

Table I-PC-1. Isolator load points, units with a vertical discharge configuration, lbs.

model
3-ton 5-ton 7.5-ton 10-ton 15-ton

L1 L2 L3 L4
SCRB/SIRB
99 105 120 127 115 122 157 166 154 203 227 221 208 266 273 253 243 332 359 356

L1 L2 L3 L4
SCWB/SIWB
105 133 118 124 129 165 166 165 177 234 230 231 263 334 293 300 315 388 382 375

Table I-PC-2. Isolator load points, units with a horizontal discharge configuration, lbs.

model
7.5-ton 10-ton 15-ton

L1 L2 L3 L4
SCRB/SIRB
250 108 313 135 318 150 363 169 404 166 510 210

L1 L2 L3 L4
SCWB/SIWB
285 126 319 140 383 211 383 211 514 215 514 215

Table I-PC-3. Isolator load points & types, units with a horizontal discharge, inverted "L" configuration, lbs.

10-ton unit spring rubber-in-shear
15-ton unit spring
rubber-in-shear

air-cooled models

318 150 363 169 red yellow red yellow
green red green red

404 166 510 210 purple yellow purple yellow

gray red gray red

water-cooled models

383 211 383 211 red yellow red yellow
green red green red

514 215 514 215 purple yellow purple yellow

gray red gray red

Note: Units ship with two different color isolators and should be placed as depicted in this chart to properly support the unit weight. See Figures I-PC-1 & I-PC-2 for correct isolator positions by unit size.

3, 5, & 7.5-ton units bottom view of unit

10 & 15-ton units bottom view of unit

1 7/8

7/8" dia. hole under all 4 corners
1 7/8 Figure I-PC-1. Isolator mounting hole locations on 3, 5, & 7.5-ton units

PKG-SVX14A-EN

1 3/8

9/16" dia. hole under all 4 corners
3 3/4 Figure I-PC-2. Isolator mounting hole locations on 10 & 15ton units

Installation

pre-installation considerations

WARNING
Improper Unit Lift! Test lift unit approximately 24 inches high to verify the proper center-ofgravity lift point. To avoid dropping the unit, reposition the lifting point if the unit is not level. Failure to properly lift the unit could result in death, serious injury, or possible equipment/ property-only damage.

Proper Lifting Procedure
Follow these instructions and reference Figure I-PC-3. 1. Slide a fork lift into the opening
provided on the unit base. Move the fork lift carefully.

2. Using slings, attach through the circular holes provided on the unit base. Protect the unit from damage by rigging equipment.

Figure I-PC-3. Proper unit lifting procedure
10

PKG-SVX14A-EN

3 & 5-tons SCWH/SCRH

Installation

dimensions & weights

vertical discharge

horizontal discharge (field converted)

SCWH

SCRH

SCWH/SCRH dimensions & weight, in-lbs.

unit

size A

3 31.89 64.17 22.24 5.65 11.93 14.31 10.63 18.00 7.80 7.80 15.60 15.63 20.20 6.28 4.33 8.58 4.37

5 36.41 75.98 24.01 7.73 13.03 15.65 11.61 20.31 12.32 8.66 20.98 18.58 24.20 7.10 5.43 6.38 7.12

shipping weight
494
592

operating weight
459
555

PKG-SVX14A-EN

7.5-tons SCWH/SCRH

Installation

dimensions & weights

vertical discharge

horizontal discharge (field converted)

SCWH/SCRH weight, lbs.

unit

shipping

operating

size

weight

7.5

702

657

SCWH

SCRH

PKG-SVX14A-EN

Installation

dimensions & weights

10, 12, & 15-tons with top-mounted fan configuration SCWH/SCRH
vertical discharge

horizontal discharge (field converted)

SCWH

SCWH/SCRH dimensions & weight, in-lbs.

unit

tons A

10 66.75 88.78 7.04 18.07 57.28 19.01 25.0 5.23 7.48

12 65.75 92.71 7.04 18.07 61.22 22.95 29.01 5.23 7.48

15 80.31 92.71 19.83 19.83 61.22 22.95 29.01 4.76 5.12

MN 5/8 8.30 5/8 12.24 3/4 12.24

shipping weight
984 977 1098

operating weight 917 907 1021

SCRH

PKG-SVX14A-EN

Installation

dimensions & weights

10, 12, & 15-tons with side-mounted fan configuration, field converted SCWH/SCRH

SCWH/SCRH Dimensions, in.

unit

tons A

10 65.75 7.04 18.07 57.28 66.93 25.79

12 65.75 7.04 18.07 61.22 66.93 29.73

15 80.31 19.83 19.83 61.22 81.49 29.73

Notes: 1. Base rail must be attached to the floor before converting
unit to side-mounted fan configuration. 2. Coil or electric heater cannot be assembed inside the
cabinet with the side-mounted fan configuration.

PKG-SVX14A-EN

Plenum

Installation

dimensions & weights

Hot water coil 3 & 5-ton units
5.91

A B

Plenum dimensions & weight, in-lbs.

unit size

weight

3-ton

31.89

22.24

5-ton

36.41

24.01

7.5-ton

40.94

28.74

10 & 12-ton

65.75

29.52

120

15-ton

80.31

29.52

146

3.15 1.57

0.59

2.18

1.38

8.39

0.28 E

2.18

1.38

0.59

0.39

0.39 1.03

1.03 1.08

1.0 NPT
PKG-SVX14A-EN

0.75

5.9

SCWH/SCRH Hot water coil dimensions & weights, 3 & 5-ton units, in-lbs.

size

3-ton

26.46

18.98 25.67

5.79

10.00 12.76

5-ton

30.98

23.50 30.20

7.040 7.040

12.50 15.26

weight 13 18

Installation

dimensions & weights

Hot water coil

7.5-ton units

5.91 0.43

35.51 28.03

3.15 1.57

0.39

1.55

1.87

0.75 2.22

8.48

14.64

17.00 16.25 20.7

0.28

8.48

1.55

3.03

1.87

0.75 2.22

0.39

0.39 1.0 NPT

5.9

0.75

34.72

0.39

1.03

1.08

0.75

Hot water coil 10 thru 15-ton units
0.39

SCWH/SCRH Hot water coil dimensions & weights, in-lbs.

size

7.5-ton

10-ton

58.72

50.98

6.95

59.51

12-ton

58.72

50.98

6.95

59.51

15-ton

73.29

63.98

8.52

74.07

weight 24 49 49 55

1.03

0.39 1.08

1.03

2.18

0.59

1.38 1.38

9.54

0.28

15.89

20.26 17.50

9.54

2.18

9.07

7.48

0.59

1.38 8.27

0.43

1.00 NPT

0.75 5.90

B D

1.57 BLOCKOFF (SHIPS DISASSEMBLED)

3.19

0.75
PKG-SVX14A-EN

Installation

mechanical requirements

Duct Connections
Install all air ducts according to the National Fire Protection Association standards for the "Installation of Air Conditioning and Ventilation Systems other than Residence Type (NFPA 90A) and Residence Type Warm Air Heating and Air Conditioning Systems (NFPA 90B).
Make duct connections to the unit with a flexible material such as heavy canvas. If a fire hazard exists, Trane recommends using Flexweave 1000, type FW30 or equivalent canvas. Use three inches for the return duct and three inches for the discharge duct. Keep the material loose to absorb fan vibration.
Run the ductwork straight from the opening for a minimum of three fan diameters. Do not make abrupt turns or transitions near the unit due to increased noise and excessive static losses. Use elbows with splitters or turning vanes to minimize static losses.
Poorly constructed turning vanes may cause airflow generated noise. Check total external static pressures against fan characteristics to be sure the required airflow is available throughout the ductwork.
WARNING
Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

Water Piping
Condenser Connections
Note: To prevent water damage, install piping drain and vent plugs.
Condenser water piping knockouts are in the lower left end panel. If necessary, remove insulation to gain access. All field installed piping must conform to applicable local, state, and federal codes. To complete condenser water connections follow the procedure below. 1. Remove back panel to access the
water connection fittings. 2. Attach the water supply line to the inlet
connection, and the return line to the outlet connection. The water connection fittings are copper, so exercise extreme care when connecting steel piping to copper fittings. 3. Ensure that water piping is aligned to the unit connection fittings. Failure to align piping could cause stripped threads, leakage, and possible unit failure. 4. Connection to the unit water piping requires a backing wrench to prevent distortion of connecting tubing. Apply backing wrench to water connection points on unit.
Condensate Drain Connections Install a water regulating valve in the water supply line to maintainhead pressure when operating with city water of varying temperature.
These units require a minimum water pressure of 15 psig and will operate at a maximum of 400 psig.
Provide safeguards against cold weather drain line freeze.

Cooling Tower Piping Cooling tower control affects the unit cycle rates. Condenser water temperature swings from 10-15°F may cause excessive compressor, water valve, and unit cycling. Be sure to set the tower controls to minimize compressor/ unit cycling.
The cooling tower system requires a separate drain in the water supply line for service and repair.
Water Temperature Requirements Install a water regulating valve in the water supply line to maintain head pressure when operating with water of varying temperature. The valve modulates condenser water flow to control condensing pressure. The valve opens or closes in response to compressor discharge pressure as sensed by its capillary line connection iin the liquid line shrader valve. When the valve is properly installed, water flow automatically decreases as discharge pressure falls and increases as discharge pressure rises. Field installation of the water regulating valve assembly requires one valve for each refrigeration circuit.

PKG-SVX14A-EN

Installation

mechanical requirements

Refrigerant Piping (Air-Cooled Units Only)
Reference industry recommendations for air-cooled unit refrigerant piping. If suspending piping from the building, use isolation hangers to prevent vibration transmission.

Brazing Procedures Proper brazing techniques are essential when installing refrigerant piping. Keep the following factors in mind when making sweat connections. 1. When heating copper in the presence
of air, copper oxide forms. To prevent copper oxide from forming inside the

Air-cooled units ship with a holding charge of nitrogen. Before installing unit piping, momentarily depress either the suction or discharge line access valve to verify that the holding charge has not been lost. If nitrogen does not escape when depressing the access valve, leaktest the entire refrigerant system to determine the source of loss.

tubing during brazing, sweep an inert gas, such as dry nitrogen, through the tubing. Nitrogen displaces air in the tubing and prevents oxidation of interior surfaces. A nitrogen flow of one to three cubic feet per minute is sufficient to displace the air. Use a pressure regulating valve or flow meter to control the flow.

The charge is contained by a continuous loop of both hot gas and liquid lines. You must cut the loop for connection to discharge and liquid lines. See Figure IMR-1.

2. Ensure tubing surfaces that require brazing are clean and the ends of the tubes are carefully reamed to remove any burrs.
3. Make sure the inner and outer tubes of the joint are symmetrical and have a

close clearance, providing an easy slip

WARNING:

fit. If the joint is too loose, the tensile strength of the connection will be

Hazard of Explosion and Deadly Gases! Never solder, braze or weld on refrigerant lines or any unit components that are above atmospheric pressure or where

significantly reduced. Make the overlap distance equal to the inner tube diameter. 4. Wrap the body of each refrigerant line component with a wet cloth to keep it cool during brazing. Excessive heat can damage the components.

refrigerant may be present.

5. If using flux, apply it sparingly to the

Always remove refrigerant by fol- joint. Excess flux will contaminate the

lowing the guidelines estab-

refrigerant system.

lished by the EPA Federal Clean 6. Apply heat evenly over the length and

Air Act or other state or local codes as appropriate. After refrigerant removal, use dry nitrogen to

circumference of the joint, making sure the entire joint becomes hot enough to melt the brazing material.

bring system back to atmospheric

pressure before opening system

7. Begin brazing when the joint is hot enough to melt the brazing rod. The hot copper tubing, not the flame, should melt the rod.
8. Continue to apply heat around the joint circumference until the brazing material is drawn into the joint by capillary action, making a mechanically sound and gas-tight connection.
9. Visually inspect the connection after brazing to locate any pin holes or crevices in the joint. Use a mirror to inspect connections that are difficult to see.
Electrical Requirements
Follow these guidelines, referring to unit wiring diagrams and supply power dimensional information to ensure correct electrical requirements at the installation site. Reference supply power wiring locations on unit submittals orin the "Dimensions and Weights" section. Specific unit wiring diagrams are provided on each unit. Use these diagrams for connections or trouble analysis.
Unit Wiring Diagrams Specific unit wiring diagrams are provided on the inside of the control panel door. Use these diagrams for connections or trouble analysis.

for repairs. Mixtures of refrigerants and air under pressure may become combustible in the presence of an ignition source leading to an explosion. Excessive heat from soldering, brazing or welding with refrigerant vapors present can form highly toxic gases and extremely corrosive acids. Failure to follow all proper safe refrigerant handling practices could result in death or serious injury.

Figure I-MR-1. Air-cooled unit refrigerant piping

PKG-SVX14A-EN

Installation

electrical requirements

Supply Power Wiring It is the installer's responsibility to provide power supply wiring to the unit terminal block or the non-fused disconnect switch option. Wiring should conform to NEC and all applicable code requirements. 1. Verify the power supply available is
compatible with the unit nameplate ratings. The supply power must be within 10%of the rated voltage listed on the unit nameplate. 2. Reference the electrical data in Table IER-1. Protect the electrical service from over current and short circuit conditions in accordance with NEC requirements. Size protection devices according to the electrical data on the unit nameplate. 3. If using a field-supplied disconnect, install it at or near the unit in accordance with NEC. Do not mount a field-supplied disconnect on the unit. Reference the electrical service entrance location on unit submittals. 4. Complete the unit power wiring connections onto either the main terminal block or the field-provided nonfushed disconnect switch.
WARNING
Ground Wire! All field-installed wiring must be completed by qualified personnel. All field-installed wiring must comply with NEC and applicable local codes. Failure to follow this instruction could result in death or serious injuries.
WARNING
Grounding Required! Follow proper local and state electrical code on requirements for grounding. Failure to follow code could result in death or serious injury.
5. Provide proper unit grounding in accordance with local and national codes.

Electrical Data Calculations
RLA = rated load amps Compressor LRA = locked rotor amps Fan motor LRA = locked rotor amps, N.E.C. Table 430 - 151 FLA = Full load amps, N.E.C.
Table 430 - 150
Voltage utilization range is ±10%
Minimum circuit ampacity (MCA) = 1.25 x largest motor amps (FLA or RLA) + the sum of the remaining motor amps.
Maximum fuse size (MFS) and maximum circuit breaker size (MCB) = 2.25 x largest motor amps (FLA or RLA) + the sum of the remaining motor amps.
Note: If the rating value determined does not equal a standard current rating of over current protective device, use the next lower standard rating for the marked maximum rating.
Voltage Range Voltages must be within +- 10% the nameplate voltage. Ensure the unit voltage is balanced by measuring at the compressor terminals. Voltage imbalance on three phase systems can cause motor overheating and premature failure. Maximum allowable imbalance is 2.0%.
Voltage Imbalance Read the voltage at the compressor terminals to determine if it is balanced. Voltage imbalance on three phase systems can cause motor overheating and premature failure. The maximum allowable imbalance is 2.0%. Voltage imbalance is defined as 100 times the sum of the deviation of the three voltages from the average (without regard to sign) divided by the average voltage. For example, if the three measured voltages are 221, 230, and 227, the average voltage would be:
(221 + 230 + 227) = 226 volts 3
The percentage of voltage imbalance is then:
100 * (226-221) = 2.2% 226

In this example, 2.2% imbalance is not acceptable. Whenever a voltage imbalance of more than 2.0% exists, check the voltage at the unit disconnect switch. If the imbalance at the unit disconnect switch does not exceed 2.0%, faulty unit wiring is causing the imbalance. Conduct a thorough inspection of the unit electrical wiring connections to locate the fault, and make any repairs necessary.
WARNING Live Electrical Components! During installation, testing, servicing, and troubleshooting this equipment, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who is properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.
WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
CAUTION Use Copper Conductors Only! Unit terminals are not designed to accept other type conductors. Failure to use copper conductors may result in equipment damage.

PKG-SVX14A-EN

Installation

electrical requirements

Table I-ER-1. Model SCWH/SCRH electrical data

model
SC*H0303.... SC*H0304.... SC*H0305.... SC*H0503.... SC*H0504.... SC*H0505.... SC*H0753.... SC*H0754.... SC*H0755.... SC*H1003.... SC*H1004.... SC*H1005.... SC*H1203.... SC*H1204.... SC*H1205.... SC*H1503.... SC*H1504.... SC*H1505....

tons

voltage

208-230V/60Hz/3Ph 3 460V/60Hz/3Ph
575V/60Hz/3Ph
208-230V/60Hz/3Ph 5 460V/60Hz/3Ph
575V/60Hz/3Ph
208-230V/60Hz/3Ph 7.5 460V/60Hz/3Ph
575V/60Hz/3Ph
208-230V/60Hz/3Ph 10 460V/60Hz/3Ph
575V/60Hz/3Ph
208-230V/60Hz/3Ph 12 460V/60Hz/3Ph
575V/60Hz/3Ph
208-230V/60Hz/3Ph 15 460V/60Hz/3Ph
575V/60Hz/3Ph

compressor RLA LRA qty.
12.9 77.0 5.7 35.0 1 4.8 31.0
22.9 155.0 10.7 75.0 1
8.5 54.0
27.9 164.0 13.6 100.0 1 10.2 78.0
22.9 155.0 10.7 75.0 2
8.5 54.0
25.4 147.7 11.8 75.0 2
9.3 59.6
27.9 164.0 13.6 100.0 2 10.9 78.0

evaporator standard motor

evap. fan motor

FLA qty.

0.5 2.21

min. circuit ampacity
18.3

MFS / MCB 30

1.00

8.1

0.80

6.8

5.00

33.6

2.50

15.9

1.50

12.1

6.30

41.2

3.10

20.1

2.40

15.2

6.30

57.8

3.10

27.2

2.40

21.5

9.40

66.5

4.60

31.2

3.40

24.4

9.40

72.2

100

4.60

35.2

3.40

27.9

evaporator oversized motor

evap. fan motor min. circuit

FLA qty ampacity

MFS / MCB

3.15

19.3

1.42

8.5

1.14

7.1

5.81

34.4

2.63

16.0

2.10

12.7

5.81

40.7

2.63

19.6

2.10

14.9

13.70

65.2

6.18

30.3

4.94

24.1

13.70

70.8

6.18

32.7

4.94

25.9

13.70

76.5

100

6.18

36.8

4.94

29.5

Notes: 1. Voltage range: Nominal voltage 208 - 230V - acceptable range: 187 - 253V Nominal voltage 460V - acceptable range: 414 - 506V Nominal voltage 575V - acceptable range: 518 - 633V 2. Ampacity is calculated per UL formula, ampacity = (1.25 x compressor RLA + sum of the second compressor RLA (if
used) + evaporator motor FLA 3. Maximum fuse size is calculated per UL formula, MFS = (2.25 x compressor RLA) + sum of second compressor RLA (if
used) + evaporator motor FLA

WARNING
Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

CAUTION Use Copper Conductors Only! Unit terminals are not designed to accept other type conductors. Failure to use copper conductors may result in equipment damage.

PKG-SVX14A-EN

Installation

installation procedure

Installation Checklist
Reference the checklist below to verify all steps required to successfully install a deluxe self-contained unit are complete. This checklist is intended to acquaint the installing personnel with what is required in the installation process. It does not replace the detailed instructions detailed in the applicable sections of this manual.
WARNING
Hazardous voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
General Unit Requirements Install and secure the ductwork to the
unit. Check unit for shipping damage and
material shortage. Refer to the Receiving Checklist.
Electrical Requirements Verify that the electrical power supply
characteristics comply with the unit nameplate specifications. Inspect all control components; tighten any loose connections. Connect properly sized and protected power supply wiring to a field supplied/ installed disconnect and unit power terminal block, or to the optional unit mounted disconnect switch. Properly ground the unit.

Field Installed Control Wiring (Optional) Complete the field wiring connections.
Note: All field installed wiring must comply with NEC and applicable local codes.
Fan Discharge Conversion
Complete the steps below to convert the fan discharge from vertical to horizontal.
1. Remove all mid and top fan section panels.
2. Loosen the brackets inside the unit that clamp the mid and fan sections together.
3. Remove the control box cover and disconnect the motor power wires. Feed wires up through the unit and secure out of the way until rotation is complete.
4. Rotate the fan section to desired position.
5. Re-route the motor power wires back to the control box. Ensure all wiring is free and not routed over any sharp edges.

6. Reconnect the motor power wires per the unit wiring diagram.
7. Bolt and/or clamp all brackets back into place.
8. Replace control box cover and all exterior panels.
9. Verify the fan rotation and motor amp draw.
Plenum Installation
1. Uncrate the plenum and accessory bag.
2. Rotate the evaporator blower to the vertical discharge configuration.
3. Apply the soft gasket provided around the aluminum frame on top of the unit as shown in Figure I-IP-1.
4. Using a screwdriver, tighten the selfdrilling screws as shown in Figure I-IP1. Be sure to tighten all screws on the rear, right, and left sides through the pilot holes on the plenum panels.
5. When installation is complete, adjust the motor pulley and the discharge grille for proper airflow.

PKG-SVX14A-EN

Figure I-IP-1. Plenum installation
21

Installation

pre-startup requirements

Pre-Startup Checklist
Complete this checklist after installing the unit to verify all recommended installation procedures are complete before unit startup. This does not replace the detailed instructions in the appropriate sections of this manual. Always read the entire section carefully to become familiar with the procedures.
WARNING
Hazardous Voltage! Disconnect all electrical power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
Receiving Inspect unit and components for
shipping damage. File damage claims immediately with the delivering carrier. Check nameplate unit data so that it matches the sales order requirements. Check unit for missing material. Look for ship-with accessories that are packaged separately and placed inside the access panel, fan section, or compressor section. See the "Receiving and Handling" section.

Unit Location Ensure the unit location is adequate for
unit dimensions, ductwork, piping, and electrical connections. Ensure access and maintenance clearances around the unit are adequate. See the "Service Access" section.
Unit Mounting Remove shipping brackets on the
compressor assembly and supply fan.
Component Overview Verify the fan and motor sheaves are
aligned. Check the belt tension for proper
adjustment. Ensure the fan rotates freely. Tighten locking screws, bearing set
screws and sheaves. Ensure bearing locking collars do not
wobble when rotated. Ensure all air filters are properly
installed with consideration of size and air flow. Manually rotate the evaporator fan to ensure free movement. Verify that all of the fan mounting hardware is tight.
Ductwork Verify that all ductwork conforms to
NFPA 90A or 90B and all applicable local codes.

PKG-SVX14A-EN

Installation

startup

Unit Startup Procedures
1. Check all electrical connections for tightness.
2. Be sure all unit accessories are properly set and installed.
3. Model SCWH: Verify condenser water piping is properly connected, supply, and return.
4. Model SCRH: Verify refrigerant piping is properly connected, hot gas, and liquid.
5. Inspect all ductwork and duct connections.
6. Check for proper belt tension. 7. Check fan drive sheaves, pulleys, and
bearings.
Unit Startup Checklist 1. Turn the thermostat to the OFF
position. 2. Engage power supply by closing
power disconnect. 3. Switch thermostat to fan position and
adjust temperature setting below room temperature. Evaporator fan should start.
4. Check evaporator section for proper operation.
5. Switch thermostat to cool position and adjust temperature setting to below room temperature. The evaporator fan and compressor(s) should start.

7. Allow unit to run until all system temperatures and pressures stabilize.
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or serious injury.

Note: These units are equipped with high efficiency scroll compressors. Check for proper scroll rotation prior to operating unit.
WARNING
Hazardous voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

WARNING
Rotating Components! During installation, testing, servicing and troubleshooting of this product it may be necessary to measure the speed of rotating components. Have a qualified or licensed service individual who has been properly trained in handling exposed rotating components, perform these tasks. Failure to follow all safety precautions when exposed to rotating components could result in death or serious injury.

6. Check the evaporator fan for proper rotation. If fan rotation is incorrect, switch thermostat to Off position and disconnect power. Reverse two phase leads at disconnect and return back to Step 1 of startup.

8. Check systems for proper operation and performance. Observe unit in operation and check for unusual noise, vibration, belt, and fan clearances.

Operation

sequence of operation

Sequence of Operation
The thermostat controls the unit operation. It has both manual and automatic switches so the thermostat maintains desired comfort levels.
The fan switch allows manual selection of the fan speed using the On or Auto setting. With the switch set in the On position, the evaporator fan runs continously, independent from the thermostat temperature setting. The Auto position cycles the evaporator fan on and off with the demand for heating or cooling.
The system switch may have two or more positions. For example, using a cooling only thermostat, the system switch can be set in the Off or the Cool position. The Off position disconnects power from the thermostat contacts that control the condensing unit. This prevents

the condensing unit from running, regardless of the thermostat temperature setting. The evaporator fan may circulate air if the fan switch is in the On position. With the switch in the Cool position, the condensing unit and evaporator will operate on a signal from the thermostat calling for cooling.
With the fan switch set to Auto and the system switch set to Cool, the following sequence takes place. On a rise in room temperature,t he thermostat contacts close to provide power to the evaporator fan contactor,t he condensing unit fan contactor,a nd the condensingunit compressor contactors. As the room temperature reaches setpoing, the thermostat contacts open to de-energize all contactors,a nd the system cycles off. This system will remain off until additional cooling is required and the cycle repeats.

PKG-SVX14A-EN

Maintenance

general information

Table M-GI-1. Midrange maintenance general data

dimensions, in-lbs. height length depth weight (shipping / net) cooling performance net cooling capacity, btu/h EER nominal air flow, cfm system power, kW Copeland scroll compressor quantity model indoor coil, 3/8" tube size face area, sq. ft. rows / fpf water condenser, tube & tube water connection, in. indoor fan, belt-driven quantity diameter x width motor motor frame size air filter, 1" throwaway

SCWH030
66.93 31.89 22.24 494 / 459
36000 12.13 1200
3.0
1 ZP32
3.19 4 / 144
3/4 NPT
1 9 x 9 1 / 0.5
56

size / (quantity), in.

14 x 25 (1)

refrigerant, R-410A, TXV control

refrigerant charge (Ckt 1 / 2), lbs.

3.8

hot water coil, 2-row, 108 fpf, 1/2" tubes

face area, sq. ft.

1.42

SCWH050
78.74 36.41 24.01 592 / 555
65290 12.28 2000
5.3
1 ZP57
4.98 4 / 144
3/4 NPT
1 10 x 10 1 / 1.0
56
14 x 20 (1) + 20 x 20 (1)
5.4
2.08

SCWH075
78.94 40.94 28.74 702 / 657
87570 11.6 3000 7.6
1 ZP83
7.13 3 / 168
3/4 NPT
2 9 x 9 1 / 2.0
56
18 x 24 (2)
7.8
3.27

SCWH100 SCWH120

91.54 65.75 29.52 1094 / 1027

95.47 65.75 29.52 1133 / 1063

116986 11.5 4000 10.2

138204 11.1 4800 12.5

2 ZP57

2 ZP67

12.12 2 / 168

1 1/4 NPT 1 1/4 NPT

2 12 x 12 1 / 2.0
56

2 12 x 12 1 / 3.0
56

12 x 24 (1) + 24 x 24 (2)

5.1 / 5.2 6.2

6.5/6.3 6.2

SCWH150
95.47 80.31 29.52 1249 / 1172
167303 11.3 6000 14.8
2 ZP83
14.56 3 / 168
1 1/4 NPT
2 12 x 12 1 / 3.0
56
18 x 24 (3) + 24 x 24 (1)
7.2/7.2
7.78

Notes: 1. Net cooling capacity is rated at 95°F ambient, 80°F entering dry bulb and 67°F entering wet bulb @ SCFM air condition. 2. EER is rated at ARI condition.

PKG-SVX14A-EN

Maintenance

maintenance procedures

Maintenance Procedures
This section describes specific maintenance procedures that must be preformed as a part of the normal maintenance program. Always disconnect electrical power to the unit before performing these procedures and heed all warnings and cautions.
WARNING Live Electrical Components! During installation, testing, servicing, and troubleshooting this equipment, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who is properly trained in handling live electrical components perform these tasks. Failure to follow all electrical components could result in death or serious injury.
WARNING
Hazardous Voltage! Disconnect all electrical power including remote disconnects before servicing unit. Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing can result in death or serious injury.
Periodic Maintenance Checklist Inspect coil surface for cleanliness. Clean as required, referring to the "Coil Cleaning" section.
Annual Maintenance Checklist Perform all monthly maintenance inspections. Perform seasonal startup checks. Leak test refrigerant circuits. Inspect contacts of fan motor contactors and relays. Replace all worn contacts. Clean and repaint any corroded surface.

Note: the following coil cleaning procedures apply only to the outdoor condensers. Do not use these procedures for the reheat or evaporator coils.
Cleaning the Condenser Coils Clean the coil at least once each year or more frequently if located in a dirty environment, to help maintain proper unit operating efficiency. High discharge pressures are a good indication that the coil needs cleaning. Follow the detergent manufacturer instructions as closely as possible to avoid potential coil damage.
WARNING
Hazardous Chemicals! Coil cleaning agents can be either acidic or highly alkaline.Handle chemical carefully. Proper handling should include goggles or face shield, chemical resistant gloves, boots, apron, or protective suit as required. For personal safety, refer to the cleaning agent manufacturer's materials safety data sheet and follow all recommended safe handling practices. Failure to follow all safety instructions could result in death or serious injury.
To clean the refrigerant coil, use a soft brush and sprayer, such as a garden pump up or high pressure type . In addition, use a quality detergent; like "SPREX AC', " OAKITE 161" or "OAKITE 166" and "COILOX."
Note: If detergent is strongly alkaline (i.e. has a pH value greater that 8.5 ) after mixing, you must add an aluminum corrosion inhibitor.
WARNING
Hazardous Voltage! Disconnect all electrical power including remote disconnects before servicing unit. Follow proper lockout/tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing can result in death or serious injury.

Coil Cleaning Procedure 1. Disconnect power to the unit. 2. Remove panels from the unit to gain
access to the coil. 3. Use a soft brush to remove loose dirt
and debris form both sides of the coil. 4. Straighten coil fins with fin comb as
required. 5. Mix the detergent with water
according to the manufacturers instructions.
Observe all recommendations of the cleanser manufacturer. The coil cleanser manufacturer's recommendations, warnings and cautions will at all times take precedence to these instructions. 1. Place solution in the sprayer. Be sure to
follow these guidelines if using a highpressure sprayer: a) Keep minimum nozzle spray angle 15°. b) Spray solution at a 90° angle to the coil face. c) Keep sprayer nozzle at least six inches from the coil. d) Sprayer pressure must not exceed 600 psi. 2. Spray leaving air side of the coil first then spray the entering air side of the coil. Allow the detergent and water solution to stand on the coil for five minutes. 3. Rinse both sides of the coil with cool, clean water. 4. Inspect the coil. If it still appears dirty, repeat the cleaning procedure. 5. Reinstall all unit components and panels, and restore electrical power and gas supply to the unit.
CAUTION
Freezing Temperatures! Do not allow liquid refrigerant to come into contact with the skin. If it does, treat the injury similar to frostbite. Slowly warm the ffected area with lukewarm water and seek immediate medical attention. Direct contact with liquid refrigerant may cause minor or moderate injury.

PKG-SVX14A-EN

Maintenance

maintenance procedures

Refrigerant System
Special Note on Refrigerant Emissions Follow the Trane recommended procedures on operation, maintenance, and service to ensure refrigerant conservation and emission reduction. Also, pay specific attention to the following: · Whenever removing refrigerant from
equipment, recover for reuse, recycle, reprocess (reclaim), or properly destroy it. · Always determine possible refrigerant recycling or reclaiming requirements before beginning recovery. Questions about recovered refrigerants and acceptable refrigerant quality standards are addressed in ARI Standard 700. · Use approved containment vessels and safety standards. Comply with all applicable transportation standards when shipping refrigerant containers. · To minimize emissions while recovering refrigerant, use recycling equipment. Always attempt to use methods that pull the lowest possible system vacuum while recovering and condensing refrigerant into containment. · When leak checking with trace refrigerant and nitrogen, use HCFC22 (R22) rather than CFC12 (R12) or any other fully halogenated refrigerants. Be aware of any new leak test methods that eliminate refrigerant as a trace gas. · When cleaning system components or parts, do not use CFC11 (R11) or CFC113 (R113). Refrigeration system clean up methods using filters and dryers are recommended. Do not use solvents that have ozone depletion factors. Properly dispose of used materials. · Take extra care to properly maintain all service equipment directly supporting refrigerant service work such as gauges, hoses, vacuum pumps, and recycling equipment. · Stay aware of unit enhancements, conversion refrigerants, compatible parts, and manufacturer's recommendations that reduce refrigerant emissions and increase equipment operating efficiencies. Follow specific manufacturer's guidelines for conversion of existing systems.

· To assist in reducing power generation emissions, always attempt to improve equipment performance with improved maintenance and operations that will help conserve energy resources.
WARNING
Confined Space Hazards! Do not work in confined spaces where sufficient quantities of refrigerant or other hazardous, toxic, or flammable gas may be leaking. Refrigerant or other gases could displace available oxygen to breathe, causing possible asphyxiation or other serious health risks. Some gases may be flammable and or explosive. Evacuate the area immediately and contact the proper rescue or response authority. Failure to take appropriate precautions or to react properly to a potential hazard could result in death or serious injury.
WARNING
Hazard of Explosion! Use only dry nitrogen with a pressure regulator to pressurize the unit. Do not use acetylene, oxygen, compressed air, or mixtures containing them. Do not use mixtures of a hydrogen containing refrigerant and air above atmospheric pressure for pressure testing as they may become flammable and could result in an explosion. Refrigerant, when used as a trace gas should only be mixed with dry nitrogen for pressurizing units. Failure to follow these recommendations could result in death, serious injury, equipment, or property-only damage.
WARNING
Leak Testing! Do not exceed 200 psig when leak testing system. Failure to follow these instructions could result in an explosion causing death or serious injury.

In the event of required system repair, leak test the liquid line, evaporator coil, and suction line at pressures dictated by local codes, and using the following guidelines. 1. Charge enough refrigerant and dry
nitrogen into the system to raise the pressure to 100 psig. 2. Use a halogen leak detector, halide torch, or soap bubbles to check for leaks. Check interconnecting piping joints, the evaporator coil connections, and all accessory connections. 3. If a leak is detected, release the test pressure, break the connections and reassemble it as a new joint, using proper brazing techniques. 4. If no leak is detected, use nitrogen to increase the test pressure to 150 psig and repeat the leak test. Also, use soap bubbles to check for leaks when nitrogen is added. 5. Retest the system to make sure new connections are solid. 6. If a leak is suspected after the system has been fully charged with refrigerant, use a halogen leak detector, halide torch, or soap bubbles to check for leaks.
Refrigerant Evacuation For field evacuation, use a rotary style vacuum pump capable of pulling a vacuum of 100 microns or less.
When connecting the vacuum pump to a refrigeration system, it is important to manifold the pump to both the high and low side of the system. Follow the pump manufacturer's directions.
WARNING
Use of Pressure Regulator Valves Gauges! Always use pressure regulators, valves, and gauges to control drum and line pressures when pressure testing equipment. Failure to follow these instructions could result in an explosion causing death, serious injury, or equipment damage.

PKG-SVX14A-EN

Maintenance

maintenance procedures

CAUTION
Motor Winding Damage! Do not use a megohm meter or apply greater than 50 VDC to a compressor motor winding while it is under a deep vacuum. Voltage sparkover may cause damage to the motor windings.

Charging the Refrigerant System To completely charge the system, charge gaseous refrigerant into the suction line shrader valve with the unit running. However, make sure that some refrigerant is present in each circuit before starting the compressors.

WARNING
Hazardous Pressures! If a heat source is required to raise the tank pressure during removal of refrigerant from cylinders, use only warm water or heat blankets to raise the tank temperature. Do not exceed a temperature of 150°F. Do not, under any circumstances, apply direct flame to any portion of the cylinder. Failure to follow these safety precautions could result in a violent explosion, which could result in death or serious injury.

CAUTION Compressor Damage! Do not allow liquid refrigerant to enter the suction line. Excessive liquid accumulation in the liquid lines may result in compressor damage.
CAUTION Compressor Damage! Never manually or automatically pump down below 7 psig. This may cause the compressor to operate in a vacuum and result in compresor damage.

Table M-MP-1. Normal operation condition

high pressure low pressure superheat subcooling

Table M-MP-2. Controls adjustment control high pressure control (air-cooled & 12-ton water cooled) high pressure control (water-cooled except 12-ton) low pressure contol
motor windings thermostat, standard motor only

disarming
624±17.5 psig
450±10 psig 51±7 psig 130±5C 135±5C 130±5C 90±5C 120±5C 90±5C 105±5C

water-cooled

air-cooled

280 to 430 psig

320 to 570 psig

100 to 160 psig

4 to 9°C

5 to 10°C

rearming
464±29 psig
348±14.5 psig 94±7 psig 90±5 92 92 57 69 57 61

unit (ton / voltage)
3 / 204-230 & 575 5 / 208-230 5 / 575
7.5 - 10 / 208-230 7.5 - 10 / 575
12 - 15 / 208-230 12 - 15 / 575

PKG-SVX14A-EN

Maintenance

periodic checklists

Periodic Checklists
Monthly Checklist The following checklist provides the recommended maintenance schedule to keep the unit running efficiently.

interference with fan blades. Remove obstructions and debris. Center the fan wheel if necessary. 4. Check the fan assembly sheave alignment. Tighten set screws to their proper torques.

WARNING

Hazardous Voltage! Disconnect all electrical power including remote disconnects before servicing

Note: Perform this procedure monthly if the unit is in a coastal or corrosive environment.

unit. Follow proper lockout/tagout

procedures to ensure power cannot be Annual Maintenance

inadvertently energized. Failure to

Check and tighten all set screws, bolts,

disconnect power before servicing could locking collars and sheaves.

result in death or serious injury.

1. Inspect, clean, and tighten all electrical

connections.

2. Visually inspect the entire unit casing

1. Inspect unit air filters. Clean or replace

for chips or corrosion. Remove rust or

if airflow is blocked or if filters are dirty.

corrosion and repaint surfaces.

2. Inspect coils for icing. Icing on the coils 3. Visually check for leaks in refrigerant

may indicate low airflow supply,

piping.

restricted airflow from dirty fins.

4. Inspect fan, motor, and control

3. Check the fan belt condition and

contacts. Replace badly worn or eroded

tension. Adjust tension if belt is floppy or contacts.

squeals continually.

4. Check and record operating pressures.

Semi-Annual Maintenance 1. Verify the fan motor is properly aligned
and bolted tight to the motor frame. 2. Lubricate fan bearings. 3. With power disconnected, manually
rotate the fan wheel to check for obstructions in the housing or

5. Inspect the thermal expansion valve sensing bulbs for cleanliness, good contact with the suction line, and adequate insulation from ambient air.
WARNING
Live Electrical Components! During installation, testing, servicing, and troubleshooting this equipment, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who is properly trained in handling live electrical components perform these tasks. Failure to follow all electrical components could result in death or serious injury.

PKG-SVX14A-EN

Maintenance

troubleshooting

Troubleshooting
Use the following steps and procedures to help correct these common problems.

Problem The entire unit does not operate. Possible cause 1. Power interruption 2. Thermostat not operating 3. Electrical panel: a) 24-volt transformer defective; b) loose wire

Remedy 1. Check for blown fuses or tripped circuit breakers. Replace or reset if necessary. 2. Setting may be too high; check unit and reset. Thermostat may be out of calibration or otherwise defective; replace. 3. Correct as required.

Problem Fan runs but compressor does not start. Possible cause 1. Low voltage 2. Remote thermostat 3. Compressor contactor open or burned 4 .High pressure control cutting out unit 5. Refrigerant leak - no gas 6. Loose or defective wires. 7. Compressor shorted, open or burned 8. Defective compressor

Remedy 1. Check power supply for voltage outside the acceptable voltage range. 2. Check the control unit for loose wires. Firm any loose connections. 3. Replace. 4. Check for loose wire connection, broken or burned contacts. If defective, replace. 5. Locate leak and repair. Recharge unit. 6. Tug on wires to see if they will separate from connections. Replace terminals if necessary. 7. Check for shorts, opens, and grounded. Remove and replace compressor. 8. Remove and replace.

Problem

Remedy

Unit held off by safety.

1. Adjust tubes by bending slightly to firm position without touching other unit parts.

Possible cause

2. Level unit base. Fully support base.

1. Unit cutout on high pressure control, set at 3. Check and tighten loose screws.

385 psig

4. Tighten screws on fan wheel shaft.

2. Refrigerant leak

5. Adjust wheel position on motor shaft

3. Air restriction, dirty coils

6. Replace fan motor.

4. Partial restriction in refrigerant system 7. Replace fan bearing.

5. High pressure control

6. TXV power element charge loss

7. Loose connection in electrical unit

Problem Noisy operation. Possible cause 1. Copper tubing vibrating 2. Machine vibrating out of level
30

Remedy 2. See if unit is low on refrigerant charge. Repair leak and recharge unit. 3. Verify if the air filter is dirty or has an airflow restriction, and correct problem. 4. Locate restriction by inspecting refrigerant lines for temperature changes. Remove restriction, evacuate, and recharge. 5. Replace, if defective. 6. Evacuate, replace element, recharge. 7. Trace and firm up connection.
PKG-SVX14A-EN

Maintenance troubleshooting

Problem Insufficient cooling Possible cause 1. Insufficient air flow due to: a) dirty evaporator; b) ice on evaporator coils (indicates airflow restriction through evaporator); c) dirty filter; d) obstructed discharge air intake; e) fan motor not running; f) evaporator fan or fan wheel slipping on motor shaft 2. Heat gain or loss in room exceeds unit capacity 3. Defective compressor 4. Insufficient refrigerant charge indicated by: a) low wattage; b) condenser air outlet cold 5. Overcharge of refrigerant indicated by high wattage and sweating of the compressor return line 6. Thermostat not set for full cooling 7. Insufficient airflow through condenser due to: a) dirty condenser; b) loose belt; c) fan loose on shaft 8. Cutout on high pressure 9. Only one refrigerant circuit operational in 2-circuit units
Problem Unit short cycles Possible cause 1. Remote thermostat 2. Loose connection in electrical unit 3. Thermostat contacts fluttering 4. Air flow to evaporator is restricted 5. Insufficient charge
Problem Compressor starts and runs, but fan does not run. Possible cause 1. Faulty switch 2. Open fan motor coil circuit 3. Fan binding on shroud or venturi ring

WARNING
Hazardous voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
Remedy 1. Correct as follows: a) clean; b) defrost (using fan operation only); c) clean or replace filter; d) remove obstruction; e) check electrical system; f) adjust fan position. Tighten set screw on fan wheel. 2. Refer to original load calculations. Recalculate heat gain or loss. 3. Replace, if necessary. 4. Check refrigerant charge pressure with gauges. If refrigerant is low, recharge system. 5. Reclaim excess refrigerant. 6. Refer to thermostat operating instructions. 7. Correct as follows: a) clean coil; b) verify drive is adjusted correctly; c) tighten fan on shaft. 8. See that air is flowing and that damper is set properly. 9. Reset high pressure cutout on inoperative circuit. Check contactor in inoperative circuit.
Remedy 1. Repair or replace. 2. Trace and repair. 3. Repair or replace. 4. Flush or blow dirt out of coil. 5. Reclaim, evacuate, recharge per nameplate.
Remedy 1. Replace. 2. Replace. 3. Adjust fan mounting.

PKG-SVX14A-EN

Maintenance

typical wiring diagram

PKG-SVX14A-EN

Maintenance

typical wiring diagram

PKG-SVX01A-EN

Maintenance

typical wiring diagram

PKG-SVX14A-EN

Maintenance

typical wiring diagram

PKG-SVX01A-EN

Trane A business of American Standard Companies www.trane.com
For more information, contact your local Trane office or e-mail us at comfort@trane.com

Literature Order Number Date Supersedes

PKG-SVX14A-EN September 2007 PKG-SVX14A-EN August 2004

Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

Acrobat Distiller 5.0.5 (Windows)