TRANE 4TWX7 Heat Pumps Installation Guide

TRANE 4TWX7 Heat Pumps

IMPORTANT — This Document is customer property and is to remain with this unit. Please return to service information pack upon completion of work. Heat Pumps

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.

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.

Unit Location Considerations

Unit Dimensions and Weight

Table 2.1

Unit Dimensions and Weight

Models

| H x D x W (in)|

*Weight (lb)**

4TWX7024E

| 48 x 34 x 37|

257

4TWX7036E

| 52 x 34 x 37|

257

4TWX7048E

| 52 x 34 x 37|

310

4TWX7060E

| 52 x 34 x 37|

311

• Weight values are estimated.

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.

Refrigerant Piping Limits

1. The maximum TOTAL length of refrigerant lines from outdoor to indoor unit should NOT exceed 150 feet (including lift).
   The maximum vertical change should not exceed 50 feet.

2. 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: For other line lengths, Refer to Refrigerant Piping Application Guide, SS-APG006-EN or Refrigerant Piping Software Program, 32- 3312-xx (latest revision).

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.

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.
  

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.

Unit Preparation

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.

Setting the Unit

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.

Refrigerant Line Considerations

Refrigerant Line and Service Valve Connection Sizes

Table 5.1

**RATED LINE
SIZES**|

Line Sizes

| Service Valve Connection Sizes|

Max Line & Lift Lengths

---|---|---|---

Vapor Line

| Liquid Line| Vapor Line Connection| Liquid Line Connection| TOTAL Max
Line Length (ft.)|

Max Lift (ft.)

4TWX7024E

| 5/8| 3/8| 3/4| 3/8| 150|

50

4TWX7036E

| 3/4| 3/8| 3/4| 3/8| 80|

25

4TWX7048E

| 7/8| 3/8| 7/8| 3/8| 150|

50

4TWX7060E

| 1-1/8| 3/8| 7/8| 3/8| 80|

25

**ALTERNATE LINE SIZES**| Line Sizes| Service Valve Connection Sizes| Max Line & Lift Lengths
---|---|---|---

Vapor Line

| Liquid Line| Vapor Line Connection| Liquid Line Connection| TOTAL Max
Line Length (ft.)| Max Lift (ft.)

4TWX7024E

| 3/4| 3/8| 3/4| 3/8| 80| 25
**** 4TWX7036E| 5/8| 3/8| 3/4| 3/8| 150|

50

7/8

| 3/8| 3/4| 3/8| 80|

25

4TWX7048E

|

3/4

| 3/8| 7/8| 3/8| 150| 50
**** 4TWX7060E| 3/4| 3/8| 7/8| 3/8| 150|

50

7/8

| 3/8| 7/8| 3/8| 150|

50

Note: For other line lengths, Refer to Refrigerant Piping Application Guide, SS-APG006-EN or Refrigerant Piping  Software Program, 32-3312-xx (latest revision).

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.

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.

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.

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.
  

Refrigerant Line Routing

Precautions

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

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

Refrigerant Line Brazing

Braze The Refrigerant Lines

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.

Refrigerant Line Leak Check

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.

Evacuation

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.

Service Valves

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.

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.

Electrical – Low Voltage

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.

24 VOLTS

WIRE SIZE

|

MAX. WIRE LENGTH

18 AWG

|

150 Ft.

16 AWG

|

225 Ft.

14 AWG

|

300 Ft.

Low Voltage Hook-up Diagrams

• Units with pigtails require wirenuts for connections.

• 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

• 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 “HP: 2-Stage/1 Compressor”.

Defrost Control

Defrost controls have a selectable termination temperature. As shipped, defrost will terminate at 47°F. For a higher termination temperature, cut Jumper J2 to achieve 70°F when at or below 30°F ambient. See Service  Facts shipped in the outdoor unit for more information.
Pin Identification (See Illustration at right)

1.  TEST_COMMON (Shorting any of the other pins to this pin causes the function of the other pin to be
   executed. Leaving this pin open results in the normal mode of operation.)

2. TST = Test (Shorting TEST_COMMON to this pin speeds up all defrost board timings.)

3. FRC_DFT = Forced Defrost (Short TEST_COMMON to this pin for two (2) seconds to initiate a forced defrost. Remove the short after defrost initiates.)
   Defrost Control Checkout
   Normal operation requires:

• LED on board flashing 1 time/second.
• 24V AC between R & B.
• 24V AC between Y & B with unit operating.
• Defrost initiation when FRC_DFT pin is shorted to TEST_COMMON pin.

If a defrost control problem is suspected, refer to the service information in control box.

Defrost Termination Temperatures

 | Outdoor Temperature| Termination Temperature
As Shipped| >22°F| 47°F
10°F–22°F| ODT + 25°F
6°F–10°F| 35°F
Cut Jumper 2| >30°F| 47°F
6°F–30°F| 70°F
All| < 6°F| 12 min. or 35°F every 3 hrs.

![Defrost Board

Detail](https://manuals.plus/wp-content/uploads/2023/04/TRANE-4TWX7-Heat- Pumps-Installation-Guide-50.png)

Electrical – High Voltage

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.

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.

High Voltage Ground

Ground the outdoor unit per national, state, and local code requirements.

Start Up

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.

System Charge Adjustment

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.

See Section 14.2 for Outdoor Temperatures Above 55º F

See Section 14.3 for Outdoor Temperatures Below 55º F

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.

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.

2 Ton Heat Pump

3 Ton Heat Pump

4 Ton Heat Pump

5 Ton Heat Pump

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.

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 in the Service Facts or on the label inside the control panel to verify typical performance.

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

Subcooling Charging Below 55º F Outdoor Temp. (In Heating Only)

The Subcooling Charging method in cooling is not recommended below 55º F outdoor temperature.

The only recommended method of charging at outdoor temperatures below 55º F is weighing in the charge in heating mode and referencing the refrigerant pressure curves for typical performance.

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.
14.3 Subcooling Charging Below 55º F Outdoor Temp. (In Heating Only)
Measured Suction Line Temp = __ º F
Liquid Gage Pressure = __ PSIG
Suction Gage Pressure = __ PSIG

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) = ___

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.

Checkout Procedures and Troubleshooting

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…………………………………………… [ ]

Troubleshooting

SYSTEM FAULTS

| WHAT TO
CHECK MODE| POWER
SUPPLY| HIGH VOLTAGE WIRIN| COMPRESSOR IOL| RUN CAPACITOR| START CAPACITOR| START RELAY| CONTACTOR CONTACT| LOW VOLTAGE WIRING| CONTROL TRANSFORMER| THERMOSIST| CONTACTOR COIL| LOW VOLTAGE FUSE| STUCK COMPRESSOR| INEFFICANT COMP.| REF. UNDER CHARGE| REF. OVER CHARGE| EXCESSIVE EVAP.LOAD| NON CONDESIBLE| RES OD.AIR FLOW| OD. AIR CIRCULATION| TXV/EEV STUCK
OPEN| SUPERHEAT| RES ID. FLOW| REF.CIR.RESTRICTION| SOV LEAKING| SOV COIL DEFECTIVE| CHECK VALVE| DEFROST REALY DEF.|

DEFROST CONTROL DEF.

---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---
REFRIGERANT CIRCUIT
Head Pressure Too High|

C

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S

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H

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Head Pressure Too Low|

C

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H

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| S| S|  | S| S|  | P|

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Suction Pressure Too High|

C

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P

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H

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Suction Pressure Too Low| C|  |

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P

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S

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S

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H

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| S| S|  | S|  |

S

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Liquid Refrig. Floodback (TXV/EEV)|

C

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H

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Liquid Refrig. Floodback (Cap. Tube)|

C

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H

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S

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I.D. Coil Frosting|

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Compressor Runs

Inadequate or No Cooling/Htg

|

C

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H

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ELECTRICAL
Compressor & O.D. Fan Won’t Start|

C

| P| P|  |  |  |  |  | S| P| S| P|

P

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

H

| P| P|  |  |  |  |  | S| P| S| P| P|

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compressor Will Not Start But O.D. Fan Runs| C|  | P| S| P| S| S| S|  |  |  | |  | P|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
H|  | P| S| P| S| S| S|  |  |  |  |  |

P

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

O.D. Fan Won’t Start

| C|  | P|  | P|  |  | S|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | |  |  |  |
H|  | P|  | P|  |  | S|  |

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compressor Hums But Won’t Start|

C

|  |  |  | P| S| S| S|  |  |  |  |  |

P

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

H

|  |

|  | P| S| S| S|  |  |  |  |  |

P

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compressor Cycles on IOL|

C

|  | P| S| P| S| S| S|  |  |  |  |  | P| S| P| P|

S

|  | S| S|

| S|

|

| S|  |  |  |

H

|  | P| S| P| S| S| S|  |  |  |  |  | P| S| P| P|

S

|  | S|  |  |

S

|

P

|  |

S

|  |  |  |

I.D. Blower Won’t Start

| C| P| P|  |  |  |  |  | S| P| S|  | S|  |  |  |  |  |  |  |  |  |  |  |  | |  |  |  |
H| P| P|  |  |  |  |  | S| P| S|  |

S

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEFROST
Unit Won’t Initiate Defrost| C| |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | |  |  |  |  |  |  |  |  |  |  |  |
H|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

|  |  |  |  |  |  | P|  | P| P
Defrost Terminates on Time| C|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | |  |  |  |  |  |  |  |  |  |  |  |
H|  |  |  |  |  |  |  |  |  |  |  |  |  |

|

P

|  |  |  |  |  |  |  |  |  |  |  |  |  |

P

Unit Icing Up| C|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | |  |  |  |  |  |  |  |
H|  |  |  |  |  |  |  |  |  |  |  |  |  |

|

P

|  |  |  | S| S|  |  | S|  |  | P|  |  | P

*C – Cooling H – Heating P – Primary Causes S – Secondary Causes  – 3 Phase Only**

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-BC109D1-1A-EN 10 Jun 2022
Supersedes (New)

References

• DWG.no - DWG Cad Software | DWG View | DWG til PDF | Norsk nettside som går gjennom nyheter og muligheter innen 2D og 3D design
• Trane Heating & Air Conditioning

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