TRANE 4TTX7 Condensing Units Instruction Manual

Instruction Manual for TRANE models including: 4TTX7, 4TTX7 Condensing Units, Condensing Units, Units

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18-AC125D1-1B-EN 07062023

18-AC125D1-1B-EN
Installation and Operation Manual
Condensing Units
4TTX7
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES IMPORTANT -- This Document is customer property and is to remain with this unit. Please return to service information pack upon completion of work. These instructions do not cover all variations in systems or provide for every possible contingency to be met in connection with the installation. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser's purposes, the matter should be referred to your installing dealer or local distributor. Note: The manufacturer recommends installing only approved matched indoor and outdoor systems. All of the manufacture's split systems are AHRI rated only with TXV/EEV indoor systems. Some of the benefits of installing approved matched indoor and outdoor split systems are maximum efficiency, optimum performance and the best overall system reliability.
Table of Contents
Section 1. Safety ..................................................................................... 2 Section 2. Unit Location Considerations.............................................. 3 Section 3. Unit Preparation.................................................................... 4 Section 4. Setting the Unit ..................................................................... 4 Section 5. Refrigerant Line Considerations......................................... 4 Section 6. Refrigerant Line Routing ..................................................... 6 Section 7. Refrigerant Line Brazing...................................................... 7 Section 8. Refrigerant Line Leak Check ............................................... 8 Section 9. Evacuation............................................................................. 8 Section 10. Service Valves ..................................................................... 8 Section 11. Electrical - Low Voltage ..................................................... 9 Section 12. Electrical - High Voltage .................................................. 11 Section 13. Start Up.............................................................................. 11 Section 14. System Charge Adjustment............................................. 11 Section 15. Checkout Procedures....................................................... 15 Section 16. Refrigerant Circuits .......................................................... 16 Section 17. Wiring Diagrams ............................................................... 18 Section 18. Pressure Curves ............................................................... 22

Section 1. Safety
! WARNING
This information is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience. Any attempt to repair a central air conditioning product may result in personal injury and/or property damage. The manufacture or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.
! WARNING
These units use R-410A refrigerant which operates at 50 to 70% higher pressures than R-22. Use only R-410A approved service equipment. Refrigerant cylinders are painted a "Rose" color to indicate the type of refrigerant and may contain a "dip" tube to allow for charging of liquid refrigerant into the system. All R-410A systems use a POE oil that readily absorbs moisture from the atmosphere. To limit this "hygroscopic" action, the system should remain sealed whenever possible. If a system has been open to the atmosphere for more than 4 hours, the compressor oil must be replaced. Never break a vacuum with air and always change the driers when opening the system for component replacement. For specific handling concerns with R-410A and POE oil reference Retrofit Bulletins SS-APG006-EN and APP-APG011-EN or APP-APG012-EN.
! WARNING
UNIT CONTAINS R-410A REFRIGERANT! R-410A operating pressures exceed the limit of R-22. Proper service equipment is required. Failure to use proper service tools may result in equipment damage or personal injury.
SERVICE USE ONLY R-410A REFRIGERANT AND APPROVED POE COMPRESSOR OIL.
! WARNING
Extreme caution should be exercised when opening the Liquid Line Service Valve. Turn counterclockwise until the valve stem just touches the rolled edge. No torque is required. Failure to follow this warning will result in abrupt release of system charge and may result in personal injury and /or property damage.

! WARNING
LIVE ELECTRICAL COMPONENTS! During installation, testing, servicing, and troubleshooting of this product, it may be necessary to work with live electrical components. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.
! CAUTION
If using existing refrigerant lines make certain that all joints are brazed, not soldered.
! CAUTION
Scroll compressor dome temperatures may be hot. Do not touch the top of compressor; it may cause minor to severe burning.

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Section 2. Unit Location Considerations
2.1 Unit Dimensions and Weight

Table 2.1

Unit Dimensions and Weight

Models

H x D x W (in)

4TTX7024E

48 x 34 x 37

4TTX7036E

52 x 34 x 37

4TTX7048E

52 x 34 x 37

4TTX7060E

52 x 34 x 37

* Weight values are estimated.

Weight* (lb) 265 271 286 295

When mounting the outdoor unit on a roof, be sure the roof will support the unit's weight.

Properly selected isolation is recommended to alleviate sound or vibration transmission to the building structure.

H W
D

2.2 Refrigerant Piping Limits

1. The maximum TOTAL length of refrigerant lines from outdoor to indoor unit should NOT exceed 150 feet* (including lift).
2. The maximum vertical change should not exceed 50 feet*.
3. Standard and alternate line sizes and service valve connection sizes are shown in Table 5.1.
* See Table 5.1 for exceptions for certain tonnages. Note: vFor other line lengths, Refer to Refrigerant Piping Application Guide, SS-APG006F-EN, or Refrigerant Piping Software Program.

Standard Line Set 150' Max TOTAL Line Length

50' Max Vertical Change

2.3 Suggested Locations for Best Reliability
Ensure the top discharge area is unrestricted for at least five (5) feet above the unit. Three (3) feet clearance must be provided in front of the control box (access panels) and any other side requiring service. It is not recommended to install in a location where noise may distract the building occupants. Some examples of these types of locations are sleeping quarters and by windows of a living area. Please discuss location with the building owner prior to installation. Avoid locations such as near windows where condensation and freezing defrost vapor can annoy a customer. Position the outdoor unit a minimum of 12" from any wall or surrounding shrubbery to ensure adequate airflow. Outdoor unit location must be far enough away from any structure to prevent excess roof runoff water or icicles from falling directly on the unit.
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Avoid Install Near Bedrooms
Min. 12" to Shrubbery

50' Max Vertical Change
Min 5' Unrestricted Min 3' Unrestricted Access Panel
3

2.4 Cold Climate Considerations
NOTE: It is recommended that these precautions be taken for units being installed in areas where snow accumulation and prolonged below freezing temperatures occur.
· Units should be elevated 3-12 inches above the pad or rooftop, depending on local weather. This additional
height will allow drainage of snow and ice melted during defrost cycle prior to its refreezing. Ensure that drain holes in unit base pan are not obstructed preventing draining of defrost water.
· If possible, avoid locations that are likely to accumulate snow drifts. If not possible, a snow drift barrier should
be installed around the unit to prevent a build-up of snow on the sides of the unit.
2.5 Coastal Considerations
If installed within one mile of salt water, including seacoasts and inland waterways, models without factory supplied Seacoast Salt Shields require the addition of BAYSEAC001 (Seacoast Kit) at installation time.

Section 3. Unit Preparation
3.1 Prepare The Unit For Installation
STEP 1 - Check for damage and report promptly to the carrier any damage found to the unit. STEP 2 - To remove the unit from the pallet, remove tabs by cutting with a sharp tool.
Section 4. Setting the Unit
4.1 Pad Installation

When installing the unit on a support pad, such as a concrete slab, consider the following:
· The pad should be at least 1" larger than the unit on all sides. · The pad must be separate from any structure. · The pad must be level. · The pad should be high enough above grade to allow for drainage. · The pad location must comply with National, State, and Local codes.
For other applications refer to application guide.

Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes

Table 5.1

RATED LINE SIZES
4TTX7024E 4TTX7036E 4TTX7048E 4TTX7060E

Line Sizes

Vapor Line

Liquid Line

3/4

3/8

3/4

3/8

7/8

3/8

1-1/8

3/8

Service Valve Connection Sizes

Vapor Line Connection

Liquid Line Connection

3/4

3/8

3/4

3/8

7/8

3/8

7/8

3/8

Max Line & Lift Lengths

TOTAL Max Line Length (ft.)

Max Lift (ft.)

150

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ALTERNATE LINE SIZES 4TTX7024E
4TTX7036E
4TTX7048E
4TTX7060E

Line Sizes

Vapor Line

Liquid Line

3/4

3/8

5/8

3/8

7/8

3/8

3/4

3/8

3/4

3/8

7/8

3/8

Service Valve Connection Sizes

Vapor Line Connection

Liquid Line Connection

3/4

3/8

3/4

3/8

3/4

3/8

7/8

3/8

7/8

3/8

7/8

3/8

Max Line & Lift Lengths

TOTAL Max Line Length (ft.)

Max Lift (ft.)

150

Note: For other line lengths, Refer to Refrigerant Piping Application Guide, SS-APG006-EN or Refrigerant Piping Software Program, 32-3312-xx (latest revision).
5.2 Factory Charge
The outdoor condensing units are factory charged with the system charge required for the outdoor condensing unit, ten (10) feet of tested connecting line, and the smallest rated indoor evaporative coil match. Always verify proper system charge via subcooling (TXV/EEV) or superheat (fixed orifice) per the unit nameplate.

5.3 Required Refrigerant Line Length

Determine required line length and lift. You will need this later in STEP 2 of Section 14.

Total Line Length = __________ Ft. Total Vertical Change (lift) = __________ Ft.

Line Length

5.4 Refrigerant Line Insulation
Important: The Vapor Line must always be insulated. DO NOT allow the Liquid Line and Vapor Line to come in direct (metal to metal) contact.

Liquid Line

Vapor Line Insulation

5.5 Reuse Existing Refrigerant Lines
! CAUTION
If using existing refrigerant lines make certain that all joints are brazed, not soldered.
For retrofit applications, where the existing indoor evaporator coil and/or refrigerant lines will be used, the following precautions should be taken: · Ensure that the indoor evaporator coil and refrigerant lines are the correct size. · Ensure that the refrigerant lines are free of leaks, acid, and oil.

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Section 6. Refrigerant Line Routing
6.1 Precautions

Important: Take precautions to prevent noise within the building structure due to vibration transmission from the refrigerant lines.

Comply with National, State, and Local Codes when isolating line sets from joists, rafters, walls, or other structural elements.

For Example: · When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation type
hangers. · Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings. · Where the refrigerant lines run through a wall or sill, they should be insulated and isolated. · Isolate the lines from all ductwork. · Minimize the number of 90º turns.

8 Feet Maximum

Joist/Rafter

Isolator

Side View

8 Feet Maximum
Secure Vapor line from joists using isolators every 8 ft. Secure Liquid Line directly to Vapor line using tape, wire, or other appropriate method every 8 ft.

Isolation From Joist/Rafter

8 Feet Maximum

Side View

8 Feet Maximum Secure Vapor Line using isolators every 8 ft. Secure Liquid Line directly to Vapor Line using tape, wire, or other appropriate method every 8 ft.
Isolation In Wall Spaces

Line Set
Wall Isolator Line Set

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Wall

Sealant Insulation Vapor Line

Ductwork Isolator

Line Set

Isolation Through Wall
Section 7. Refrigerant Line Brazing
7.1 Braze The Refrigerant Lines

DO NOT hang line sets from ductwork

STEP 1 - Remove caps or plugs. Use a deburing tool to debur the pipe ends. Clean both internal and external surfaces of the tubing using an emery cloth. STEP 2 - Remove the pressure tap cap and valve cores from both service valves. STEP 3 - Purge the refrigerant lines and indoor coil with dry nitrogen. STEP 4 - Wrap a wet rag around the valve body to avoid heat damage and continue the dry nitrogen purge. Braze the refrigerant lines to the service valves. For units shipped with a field-installed external drier, check liquid line filter drier's directional flow arrow to confirm correct direction of refrigeration flow (away from outdoor unit and toward evaporator coil) as illustrated. Braze the filter drier to the Liquid Line. Continue the dry nitrogen purge. Do not remove the wet rag until all brazing is completed. Important: Remove the wet rag before stopping the dry nitrogen purge. Note: Install drier in Liquid Line. NOTE: Precautions should be taken to avoid heat damage to basepan during brazing. It is recommended to keep the flame directly off of the basepan.
STEP 5 - Replace the pressure tap valve cores after the service valves have cooled.

STEP 1
3-4" from valve
STEP 4 18-AC125D1-1B-EN

STEP 2 STEP 5

STEP 3 7

Section 8. Refrigerant Line Leak Check
8.1 Check For Leaks
STEP 1 - Pressurize the refrigerant lines and evaporator coil to 150 PSIG using dry nitrogen. STEP 2 - Check for leaks by using a soapy solution or bubbles at each brazed location. Remove nitrogren pressure and repair any leaks before continuing.
Section 9. Evacuation
9.1 Evacuate the Refrigerant Lines and Indoor Coil
Important: Do not open the service valves until the refrigerant lines and indoor coil leak check and evacuation are complete. STEP 1 - Evacuate until the micron gauge reads no higher than 350 microns, then close off the valve to the vacuum pump. STEP 2 - Observe the micron gauge. Evacuation is complete if the micron gauge does not rise above 500 microns in one (1) minute. Once evacuation is complete blank off the vacuum pump and micron gauge, and close the valves on the manifold gauge set.
Section 10. Service Valves
10.1 Open the Gas Service Valve
Important: Leak check and evacuation must be completed before opening the service valves. NOTE: Do not vent refrigerant gases into the atmosphere. STEP 1 - Remove valve stem cap. STEP 2 - Using an adjustable wrench, turn valve stem 1/4 turn counterclockwise to the fully open position. STEP 3 - Replace the valve stem cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
10.2 Open the Liquid Service Valve
! WARNING
Extreme caution should be exercised when opening the Liquid Line Service Valve. Turn counterclockwise until the valve stem just touches the rolled edge. No torque is required. Failure to follow this warning will result in abrupt release of system charge and may result in personal injury and /or property damage.
Important: Leak check and evacuation must be completed before opening the service valves. STEP 1 - Remove service valve cap. STEP 2 - Fully insert 3/16" hex wrench into the stem and back out counterclockwise until valve stem just touches the rolled edge (approximately five (5) turns.) STEP 3 - Replace the valve cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.

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CAP
UNIT SIDE OF VALVE

1/4 TURN ONLY COUNTERCLOCKWISE FOR FULL OPEN POSITION
VALVE STEM

Cap
Unit Side of Service
Valve

3/16" Hex Wrench
Rolled Edge to Captivate Stem
Hex Headed Valve System

PRESSURE TAP PORT GAS LINE CONNECTION
Gas Service Valve
Section 11. Electrical - Low Voltage
11.1 Low Voltage Maximum Wire Length Table 11.1 defines the maximum total length of low voltage wiring from the outdoor unit, to the indoor unit, and to the thermostat.
11.2 Low Voltage Hook-up Diagrams

Service Port Liquid Service Valve

Table 11.1

24 VOLTS

WIRE SIZE

MAX. WIRE LENGTH

18 AWG

150 Ft.

16 AWG

225 Ft.

14 AWG

300 Ft.

With TEM 6

Thermostat

Air Handler

Outdoor Unit

R 24 VAC HOT

FAN

24 VAC Common

B/C

SOV
Y1 COOL/HEAT
1st STAGE
Y2 COOL/HEAT
1st STAGE
W1 HEATING
2nd STAGE
W2 EMERGENCY
HEAT
BK
WH/BLK

Blue

W1
White
W2
Pink
BK
WH/BLK

Thermostat
R 24 VAC HOT

With TAM 7

Air Handler

Outdoor Unit

FAN

24 VAC Common

B/C

SOV

Y COOL/HEAT

1st STAGE

Y2 COOL/HEAT
2nd STAGE
W1 HEATING
2nd STAGE
W2 EMERGENCY
HEAT
BK
WH/BLK

G B
Blue
O
Yl
YO Y2
W1
White
W2
Pink
BK
WH/BLK

B
YO Y2

· Units with pigtails require wirenuts for connections. Cap all unused wires. · In systems with multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat. ** TEM6 only - When using a BK enabled comfort control, cut BK jumper and bypass Y1 and Y2 at the air handler. Connect BK from comfort control to BK of the air handler. Install R-O jumper. · TAM7 only - When using a BK enabled comfort control, cut BK jumper on the AFC and connect BK from comfort control to BK of the air handler. TAM7 DIP switches must be configured for "AC: 2 Stage/1 Compressor".

18-AC125D1-1B-EN

With Variable Speed UH2/DH2-V Furnace

Thermostat

R 24 VAC HOT

FAN

24 VAC Common

B/C

Furnace
R

Outdoor Unit

· Units with pigtails require wirenuts for connections. Cap all unused wires. · In systems with multiple stages of heat, jumper W1 and W2 together if comfort control has only one stage of heat. ** When using a BK enabled comfort control, cut BK (W14) jumper and bypass Y and BK at the furnace. Connect BK from comfort control to BK of the furnace. · Install R-O Jumper and cut BK Jumper (W14)

COOL 1st STAGE

YLO

W1 HEATING

BK ** BK

Y2 COOL
2nd STAGE

With Variable Speed S-Series Furnace

Thermostat

R 24 VAC HOT

FAN

24 VAC Common

B/C

SOV

COOL 1st STAGE

COOL 2nd STAGE

Furnace
R

Outdoor Unit

B/C

O
(2)

NOTES: 1) For PWM (BK) enabled thermostats, cut the BK jumper on
the IFC and connect wiring. 2) The factory Y1-O jumper must remain in place for proper
LED read out in cooling mode. 3) Y1 and Y2 wiring from the thermostat must connect to
the IFC for proper airflow and LED readout. 4) Single compressor and two compressor airflow is auto-
matically set with the IFC Menu options in ODU section.
2-1=2 stage / 1 compressor (1st stage airflow = 75%) 2-2=2 stage / 2 compressors (1st stage airflow = 50%)

W1 HEATING

BK (1) BK

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Section 12. Electrical - High Voltage
12.1 High Voltage Power Supply
! WARNING LIVE ELECTRICAL COMPONENTS! During installation, testing, servicing, and troubleshooting of this product, it may be necessary to work with live electrical components. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury. The high voltage power supply must agree with the equipment nameplate. Power wiring must comply with national, state, and local codes.
Follow instructions on unit wiring diagram located on the inside of the control box cover and in the Service Facts document included with the unit.
12.2 High Voltage Disconnect Switch
Install a separate disconnect switch at the outdoor unit.
For high voltage connections, flexible electrical conduit is recommended whenever vibration transmission may create a noise problem within the structure.
12.3 High Voltage Ground
Ground the outdoor unit per national, state, and local code requirements.
Section 13. Start Up
13.1 System Start Up
STEP 1 - Ensure Sections 7 through 12 have been completed. STEP 2 - Set System Thermostat to OFF. STEP 3 - Turn on disconnect(s) to apply power to the indoor and outdoor units. STEP 4 - Wait one (1) hour before starting the unit if compressor crankcase heater accessory is used and the Outdoor Ambient is below 70ºF. STEP 5 - Set system thermostat to ON.
Section 14. System Charge Adjustment
14.1 Temperature Measurements
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recommended method of charging above 55º F ambient outdoor temperature. See Section 14.2.
For outdoor temperatures below 55º F, see Section 14.3. Note: It is important to return in the spring or summer to accurately charge the system in the cooling mode when outdoor ambient temperature is above 55º F.
For best results the indoor temperature should be kept between 70º F to 80º F.

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14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)
STEP 1 - Use the refrigerant line total length and lift measurements from Section 5.3.
Total Line Length = __________ Ft.
LIFT
Vertical Change (Lift) = __________ Ft.

STEP 2 - Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.

REFRIGERANT LINE LIFT (FT)

2 Ton Units

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

1° Add 1°
Use Design Subcooling

Add 2° Add 1°

30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]

REFRIGERANT LINE LIFT (FT)

3 Ton Units

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

4°

Add 1°

Add 2°

Add 1°

Use Design Subcooling

1°

30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]

REFRIGERANT LINE LIFT (FT)

4 Ton Units

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

1° 1°
Use Design Subcooling

Add 1°

Add 4° Add 2°
Add 1°

30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]

REFRIGERANT LINE LIFT (FT)

5 Ton Units

SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)

50 40 30 25 15 10
0 20

1° 1°
Use Design Subcooling

Add 4°
Add 2° Add 1°

Add 1° 1°
30 40 50 60 70 80 90 100 110 120 130 140 150 TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]

Design Subcooling Value = __________º F
(from nameplate or Service Facts)
Subcooling Correction = __________º F

Final Subcooling Value = __________º F

STEP 3 - Stabilize the system by operating for a minimum of 20 minutes. At startup, or whenever charge is removed or added, the system must be operated for a minimum of 20 minutes to stabilize before accurate measurements can be made. STEP 4 - Measure the liquid line temperature and pressure at the outdoor unit's service valve. Measured Liquid Line Temp = __________ º F Liquid Gage Pressure = __________ PSIG Final Subcooling Value = __________ º F STEP 5 - Use the final subcooling value, refrigerant temperature and pressure from STEP 4, to determine the proper liquid gage pressure using Table 14.2.
Example: Assume a 12º F Final Subcooling value and liquid temp of 90º F.
1. Locate 12º F Final Subcooling in Table 14.2.
2. Locate the Liquid Temperarature (90º F) in the left column.
3. The Liquid Gage Pressure should be approximately 327 PSIG. (This is the shown as the intersection of the Final Subcooling column and the Liquid Temperature row.

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Table 14.2

R-410A REFRIGERANT CHARGING CHART

FINAL SUBCOOLING (°F)

LIQUID TEMP

9 10 11 12 13 14

(°F) LIQUID GAGE PRESSURE (PSI)

55 179 182 185 188 191 195 198

60 195 198 201 204 208 211 215

107 °F

65 211 215 218 222 225 229 232

70 229 232 236 240 243 247 251

75 247 251 255 259 263 267 271

80 267 271 275 279 283 287 291

85 287 291 296 300 304 309 313

90 309 313 318 322 327 331 336

95 331 336 341 346 351 355 360

100 355 360 365 370 376 381 386

105 381 386 391 396 402 407 413

110 407 413 418 424 429 435 441

115 435 441 446 452 458 464 470

120 464 470 476 482 488 495 501

125 495 501 507 514 520 527 533

From Dwg. D154557P01 Rev. 3

STEP 6 - Adjust refrigerant level to attain proper gage pressure. Add refrigerant if the Liquid Gage Pressure is lower than the chart value.
1. Connect gages to refrigerant bottle and unit as illustrated. 2. Purge all hoses. 3. Open bottle. 4. Stop adding refrigerant when liquid line temperature and Liquid Gage Pressure matches the charging
chart Final Subcooling value.
Recover refrigerant if the Liquid Gage Pressure is higher than the chart value. STEP 7 - Stabilize the system.
1. Wait 20 minutes for the system condition to stabilize between adjustments.
Note: When the Liquid Line Temperature and Gage Pressure approximately match the chart, the system is properly charged.
2. Remove gages. 3. Replace service port caps to prevent leaks. Tighten finger tight plus an
additional 1/6 turn. STEP 8 - Verify typical performance.
Refer to System Pressure Curves at the end of the document to verify typical performance.

DISCHARGE PRESSURE (PSIG)

PRESSURE CURVE SAMPLE

Cooling @ 1450 SCFM

Heating @ 1350 SCFM

550 INDOOR ENTERING WET BULB CURVES
500 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
450

400

350 (4)

(3)

300

250

(1)
200

100

(2)
120

500 INDOOR ENTERING DRY BULB CURVES
450 TOP TO BOTTOM 80, 70, AND 60 DEG F.
400

350

300

250

200

-5

15 25 35 45 55 65

OUTDOOR TEMPERATURE (Degree F)

170 INDOOR ENTERING
165 WET BULB CURVES TOP TO BOTTOM
160 71, 67, 63 AND 59 DEG F.
155

150

145 (5)
140

(3)

135

130

125

120

115

(1)

110

100

(2)
120

140 INDOOR ENTERING 130 DRY BULB CURVES
TOP TO BOTTOM 120 80, 70, AND 60 DEG F.
110

100

-5

15 25 35 45 55 65

SUCTION PRESSURE (PSIG)

18-AC125D1-1B-EN

STEP 9 - Record System Information for reference. Record system pressures and temperatures after charging is complete. Outdoor model number = _________________ Measured Outdoor Ambient = __________ º F Measured Indoor Ambient = __________ º F Measured Liquid Line Temp = __________ º F

Measured Suction Line Temp = __________ º F Liquid Gage Pressure = __________ PSIG Suction Gage Pressure = __________ PSIG

14.3 Subcooling Charging Below 55º F Outdoor Temp.
The Subcooling Charging method in cooling is not recommended below 55º F outdoor temperature.
The recommended method of charging at outdoor temperatures below 55º F is weighing in the charge. Return when weather conditions permit charge verification through subcooling.

STEP 1 - Determine additional charge.
Note: The nameplate charge value represents the amount of refrigerant shipped in the outdoor unit and is compatible with 10 feet of AHRI rated refrigerant lines and the smallest AHRI rated coil.
Using the method below, find the charge associated with the additional length of tubing above 10 ft. and record it below.
Calculating Charge Using the Weigh-In Method
1) Measure in feet the distance between the outdoor unit and the indoor unit. (Include the entire length of the line from the service valve to the IDU.) Subtract 10 ft from this entire length and record on line 1.
2) Enter the charge multiplier (0.6 oz/ft). Each linear foot of interconnecting tubing requires the addition of 0.6 oz of refrigerant.
3) Multiply the total length of refrigerant tubing (Line 1) times the value on Step 2. Record the result on Line 3 of the Worksheet.
4) This is the amount of refrigerant to weigh-in prior to opening the service valves.

Weigh-In Method can be used for the initial installation, or anytime a system charge is being replaced. Weigh-In Method can also be used when power is not available to the equipment site or operating conditions (indoor/outdoor temperatures) are not in range to verify with the subcooling charging method.

1. Total Line length (ft) 10 ft ______________

2. Charge multiplier

x ___0.6 oz_____

3. Step 1 x Step 2

= _____________

4. Refrigerant (oz)

= _____________

18-AC125D1-1B-EN

STEP 2 - Stabilize the system by operating for a minimum of 20 minutes. At startup, or whenever charge is removed or added, the system must be operated for a minimum of 20 minutes to stabilize before accurate measurements can be made. STEP 3 - Check the liquid line temperature and liquid gage pressure to obtain a minimum of 10º subcooling in heating mode. Measured Liquid Line Temp = __________ º F Liquid Gage Pressure = __________ PSIG STEP 4 - Add charge if a minimum of 10º subcooling is not obtained with the namplate charge plus additional charge previously added. STEP 5 - Return to site for adjustment.
Important: Return in the spring or summer to accurately charge the system in the cooling mode with outdoor ambient above 55º F.

Section 15. Checkout Procedures
15.1 Operational And Checkout Procedures
Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance, all units must be operated and charge adjustments made.
Important: Perform a final unit inspection to be sure that factory tubing has not shifted during shipment. Adjust tubing if necessary so tubes do not rub against each other when the unit runs. Also be sure that wiring connections are tight and properly secured.
CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the following list:

1. Leak check refrigerant lines. ........................................ [ ]
2. Properly insulate suction lines and fittings.................... [ ]
3. Properly secure and isolate all refrigerant lines............ [ ]
4. Seal passages through masonry. If mortar is used, prevent mortar from coming into direct contact with copper tubing. .......................... [ ]
5. Verify that all electrical connections are tight................ [ ]
6. Observe outdoor fan during on cycle for clearance and smooth operation................................................... [ ]

7. Be sure that indoor coil drain line drains freely. Pour water into drain pan................................................................ [ ]
8. Be sure that supply registers and return grilles are open and unobstructed.......................................................... [ ]
9. Be sure that a return air filter is installed. ..................... [ ]
10. Be sure that the correct airflow setting is used. (Indoor blower motor) ................................................... [ ]
11. Operate complete system in each mode to ensure safe operation................................................... [ ]

18-AC125D1-1B-EN

Section 16. Refrigerant Circuits
2 Ton Units

3 Ton Units

Printed from D158964

Printed from D158948

18-AC125D1-1B-EN

4 Ton Units

5 Ton Units

Printed from D159175

18-AC125D1-1B-EN

Printed from D158965
17

Section 17. Wiring Diagrams

2 & 3 Ton Units

18-AC125D1-1B-EN

4 Ton Units

18-AC125D1-1B-EN

5 Ton Units

18-AC125D1-1B-EN

Section 18. Pressure Curves

COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F. TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB TEMPERATURE, OUTDOOR TEMPERATURE, LIQUID AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1);

LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ LIQUID (4) OR SUCTION (5) PRESSURE IN LEFT COLUMN. EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.

(3) AT INTERSECTION

ACTUAL:

(4) LIQUID PRESSURE @ 600 CFM IS 304 PSIG

LIQUID PRESSURE SHOULD BE +/- 10 PSI OF CHART

(5) SUCTION PRESSURE @ 600 CFM IS 145 PSIG

SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART

LIQUID PRESSURE (PSIG)

PRESSURE CURVES FOR 4TTX7024E1

FIRST STAGE TAM7A0B30H21
Cooling with Thermal Expansion Valve

SECOND STAGE TAM7A0B30H21
Cooling with Thermal Expansion Valve

500 INDOOR ENTERING WET BULB CURVES
450 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
400

500 INDOOR ENTERING

(2)

WET BULB CURVES

450

TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.

(2)

400

350

300 (4)

(3)

350

(4)

(3)

300

250

200
(1)
150
40 50 60 70 80 90 100 110 120

200
(1)
150 40 50 60 70 80 90 100 110 120

OUTDOOR TEMPERATURE (Degree F)

170 INDOOR ENTERING

WET BULB CURVES

TOP TO BOTTOM 71,

160 67, 63 AND 59 DEG F.

(2)

160 67, 63 AND 59 DEG F.

(2)

150

(5)

(3)

140

(3)
150
(5)
140

SUCTION PRESSURE (PSIG)

130

(1)
120 40 50 60 70 80 90 100 110 120

OUTDOOR TEMPERATURE (Degree F)

18-AC125D1-1B-EN

LIQUID PRESSURE (PSIG)

PRESSURE CURVES FOR 4TTX7036E1

FIRST STAGE TAM7A0C36H31 Cooling with Thermal Expansion Valve

SECOND STAGE TAM7A0C36H31 Cooling with Thermal Expansion Valve

500 INDOOR ENTERING WET BULB CURVES

(2)

500 INDOOR ENTERING WET BULB CURVES

(2)

450 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.

450

TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.

400

350
(3) 300 (4)
250

350

(4)

(3)

300

250

200
(1)
150 40 50 60 70 80 90 100 110 120

OUTDOOR TEMPERATURE (Degree F)

INDOOR ENTERING WET BULB CURVES 165 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.
155

145

(5)

(3)

INDOOR ENTERING WET BULB CURVES 165 TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.

155
(2) (5)
145

(2) (3)

135

125

(1)

40 50 60 70 80 90 100 110 120

(1)
125 40 50 60 70 80 90 100 110 120

OUTDOOR TEMPERATURE (Degree F)

SUCTION PRESSURE (PSIG)

PRESSURE CURVES FOR 4TTX7048E1

FIRST STAGE TAM7A0C48H41 Cooling with Thermal Expansion Valve

500 INDOOR ENTERING

WET BULB CURVES

(2)

TOP TO BOTTOM 71, 450 67, 63 AND 59 DEG F.

400

SECOND STAGE TAM7A0C48H41 Cooling with Thermal Expansion Valve

500 INDOOR ENTERING

WET BULB CURVES

TOP TO BOTTOM 71, 450 67, 63 AND 59 DEG F.

(2)

400

LIQUID PRESSURE (PSIG)

350

(4)

(3)

300

350

300 (4)

(3)

SUCTION PRESSURE (PSIG)

250

(1)
200 40 50 60 70 80 90 100 110 120

OUTDOOR TEMPERATURE (Degree F)

180 INDOOR ENTERING

WET BULB CURVES

170

TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.

160

150

(5)

(3)

140

180 INDOOR ENTERING

WET BULB CURVES

170

TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.

160

(2)

150 (5)

(2) (3)

140

130

120
(1)
110 40 50 60 70 80 90 100 110 120

OUTDOOR TEMPERATURE (Degree F)

18-AC125D1-1B-EN

LIQUID PRESSURE (PSIG)

PRESSURE CURVES FOR 4TTX7060E1

FIRST STAGE TAM7B0C60H51 Cooling with Thermal Expansion Valve

500 INDOOR ENTERING WET BULB CURVES

(2)

TOP TO BOTTOM 71, 450 67, 63 AND 59 DEG F.

400

SECOND STAGE TAM7B0C60H51 Cooling with Thermal Expansion Valve

500 INDOOR ENTERING

WET BULB CURVES

TOP TO BOTTOM 71, 450 67, 63 AND 59 DEG F.

(2)

400

350

(4)

(3)

300

350

300 (4)

(3)

250

(1)
200 40 50 60 70 80 90 100 110 120

OUTDOOR TEMPERATURE (Degree F)

180 INDOOR ENTERING

WET BULB CURVES

170

TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.

180 INDOOR ENTERING

WET BULB CURVES

170

TOP TO BOTTOM 71, 67, 63 AND 59 DEG F.

160 150
140 (5)

160

(2)

150

(5)

(3)

140

130

120
(1)
110 40 50 60 70 80 90 100 110 120

OUTDOOR TEMPERATURE (Degree F)

SUCTION PRESSURE (PSIG)

Trane - by Trane Technologies (NYSE: TT), a global climate innovator - creates comfortable, energy efficient indoor environments for commercial and residential applications. For more information, please visit trane.com or tranetechnologies.com.

The AHRI Certified mark indicates Trane U.S. Inc. participation in the AHRI Certification program. For verification of individual certified products, go to ahridirectory.org. Trane has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

18-AC125D1-1B-EN 30 Jun 2023 Supersedes 18-AC125D1-1A-EN (June 2022)

References

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References

[PDF] Condensing Units Installation and Operation ... - Trane Technologieselibrary.tranetechnologies.com âº In...