Table of Contents
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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 out-
door 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 ......................................... 5
Section 6. Refrigerant Line Routing ..................................................... 6
Section 7. Refrigerant Line Brazing ...................................................... 7
Section 8. Refrigerant Line Leak Check ............................................... 8
Section 9. Evacuation and Servicing .................................................... 8
Section 10. Service Valves .................................................................... 9
Section 11. Electrical - Low Voltage ................................................... 10
Section 12. Electrical - High Voltage .................................................. 13
Section 13. Start Up.............................................................................. 14
Section 14. System Charge Adjustment............................................. 14
Section 15. Checkout Procedures ...................................................... 18
Section 16. Defrost Control ................................................................. 19
Section 17. Troubleshooting ................................................................ 22
Section 18. Wiring Diagrams ............................................................... 24
Section 19. Pressure Curves ............................................................... 27
Section 20. Refrigerant Circuit (only for reference) .......................... 31
Installation and Operation Manual
Heat Pumps
5TWA4
18-BC120D1-1A-EN
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Summary of Contents for Trane 5TWA4
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Page 1: Table Of Contents
18-BC120D1-1A-EN Installation and Operation Manual Heat Pumps 5TWA4 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. -
Page 2: Section 1. Safety
Section 1. Safety WARNING WARNING Only qualified personnel should install and service the The appliance shall be stored in a room without equipment. The installation, starting up, and servicing continuously operating ignition sources (for examples: of heating, ventilating, and air-conditioning equipment open flames, an operating gas appliance or an can be hazardous and requires specific knowledge operating electric heater). -
Page 3: Section 2. Unit Location Considerations
Section 2. Unit Location Considerations 2.1 Piping Guidelines Piping material, pipe routing, and installation shall include protection from physical damage in operation and service, and be in compliance with national and local codes and standards. All field joints shall be accessible for inspection prior to being covered or enclosed. -
Page 4: Section 3. Unit Preparation
2.4 Suggested Locations for Best Reliability Ensure the top discharge area is unrestricted for at least five (5) feet above the unit. Avoid Install Three (3) feet clearance must be provided in front of the Near Bedrooms control box (access panels) and any other side requiring service. -
Page 5: Section 5. Refrigerant Line Considerations
Section 5. Refrigerant Line Considerations 5.1 Refrigerant Line and Service Valve Connection Sizes Table 5.1 Rated Line Sizes Service Valve Connection Sizes Vapor Liquid Vapor Line Liquid Line Model Line Line Connection Connection 5TWA4036A3 5/16 5/16 5TWA4042A3 5/16 5/16 5TWA4048A3 5/16 5/16 5TWA4060A3... -
Page 6: Section 6. Refrigerant Line Routing
Section 6. Refrigerant Line Routing 6.1 Precautions Important: Take precautions to prevent noise Comply with National, State, and Local Codes when within the building structure due to vibration isolating line sets from joists, rafters, walls, or other transmission from the refrigerant lines. structural elements. -
Page 7: Section 7. Refrigerant Line Brazing
Wall Sealant Ductwork Insulation Vapor Line Isolator Line Set Isolation Through Wall DO NOT hang line sets from ductwork Section 7. Refrigerant Line Brazing 7.1 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. -
Page 8: Section 8. Refrigerant Line Leak Check
STEP 1 STEP 2 STEP 3 3-4” from valve STEP 4 STEP 5 Section 8. Refrigerant Line Leak Check 8.1 Check For Leaks After completion of field piping for split systems, the field pipework shall be pressure tested with nitrogen and then vacuum tested prior to refrigerant charging. -
Page 9: Section 10. Service Valves
STEP 2 - Observe the micron gauge. Evacuation is complete, if the micron gauge does not rise above 500 microns in one (1) minute and 1500 1 MIN. microns in ten (10) minutes. STEP 3 - Once evacuation is complete, blank off the vacuum pump and micron gauge, and close the valve on the manifold gauge set. -
Page 10: Section 11. Electrical - Low Voltage
1/4 TURN ONLY COUNTERCLOCKWISE FOR FULL OPEN Unit Side POSITION of Service 3/16” Hex Wrench Valve Rolled Edge to VALVE STEM Captivate Stem Hex Headed UNIT SIDE Valve System OF VALVE PRESSURE TAP PORT Service Port GAS LINE CONNECTION Gas Service Valve Liquid Service Valve Section 11. - Page 11 With Furnace Outdoor Evaporator Coil MCB Furnace Thermostat Unit 24 VAC HOT 24 VAC 1) Units with pigtails require wirenuts for Common connections. Cap all unused wires. 2) For 24V control, connect factory supplied harness to circuit board at evaporator. Complete all other wiring connections at the furnace COOL 3) For 2 stage systems, connect W2 to W2 and Y2 to Y2.
- Page 12 11.3 Defrost Control - All Models except 036 Defrost controls have a selectable termination temperature. As shipped, defrost will terminate at Defrost Board Detail 47°F. For a higher termination temperature, cut Jumper J2 to achieve 70°F. See Service Facts shipped in the outdoor unit for more information. Pin Identification on J5 (See Illustration) 1.
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Page 13: Section 12. Electrical - High Voltage
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 nec- essary to work with live electrical components. Failure to follow all electrical safety precau- tions when exposed to live electrical compo- nents could result in death or serious injury. -
Page 14: Section 13. Start Up
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 70º... - Page 15 STEP 2 - Determine the final subcooling value using R-454B REFRIGERANT CHARGING CHART total Line Length and Lift measured in STEP 1 and ° the charts below. DESIGN SUBCOOLING ( LIQUID TEMP For 036A - 060A Models: ( ° F) LIQUID GAUGE PRESSURE (PSI) 036A Models 170 172 175 178 181 184 187...
- Page 16 14.4 Charging the Unit STEP 1 - Attain Proper Gauge Pressure. Using the Standard R-454B Subcool Charging Chart, adjust refrigerant level to attain proper gauge pressure. Note: Use bubble point, per the included chart, for calculating subcooling. Add refrigerant in the Liquid Gauge Pressure is lower than the chart value.
- Page 17 14.3 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 recommended method of charging at outdoor temperatures below 55º F is weighing in the charge. Return when weather conditions permit charge verification through subcooling.
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Page 18: Section 15. Checkout Procedures
STEP 5 - Complete the ‘Total System Charge’ charge rating label below and label located on the outside of the unit with a permanent marker. Note: Complete the ‘Total System Charge’ chart when final charging is complete. a. Charge added at Factory = ___________ lb/oz b. -
Page 19: Section 16. Defrost Control
Section 16. Defrost Control Defrost Control The demand defrost control measures heat pump out- door ambient temperature with a sensor located outside the outdoor coil. A second sensor located on the outdoor coil is used to measure the coil temperature. The dif- ference between the ambient and the colder coil tem- perature is the difference or delta-T measurement. - Page 20 Table 1. Defrost Control Thermistor Table Table 2. DEMAND DEFROST QUICK SPECS DEFROST ENABLED: THERMISTOR Y = ON COIL TEM- ≤52 °F ≤52 °F TEMP °F TEMP °C RESISTANCE Volts DC (OHMS) PERATURE -15.00 -26.11 135976 2.50 DEFROST PERMIT: Y = ON COIL TEMPERA- ≤32 °F ≤32 °F...
- Page 21 Timed Limp Mode. This will be accompanied DEFROST by a 1 flash. The DFC will initiate defrost after FAULT FAULT CONTROL 60 minutes of accumulated heating runtime DESCRIPTION CODES BEHAVIOR and force a defrost, which will terminate on coil temp. The limp mode will clear after the Hard Lock Out (can sensor fault is cleared.
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Page 22: Section 17. Troubleshooting
Section 17. Troubleshooting Compressor fails to start Contactor check Is contactor engergized? Go To: Compressor won’t run (contacts closed) Wait 3 minutes and check contactor Check for 24 volts AC coil again across contactor coil Is voltage If applicable, is TDR present at Replace contactor input voltage... - Page 23 Does a resistance check show an open circuit between R and S? 18-BC120D1-1A-EN...
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Page 24: Section 18. Wiring Diagrams
Section 18. Wiring Diagrams 18-BC120D1-1A-EN... - Page 25 18-BC120D1-1A-EN...
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Page 29: Section 19. Pressure Curves
Section 19. 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, DISCHARGE AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1); LOCATE INDOOR WET BULB (2);... - Page 30 PRESSURE CURVES for 5TWA4048A @SCFM Heating @SCFM Cooling 1500 1500 INDOOR ENTERING INDOOR ENTERING WET BULB CURVES WET BULB CURVES TOP TO BOTTOM TOP TO BOTTOM 80, 70 AND 60 DEG F. 71, 67, 63 AND 59 DEG F. OUTDOOR TEMPERATURE (Degree F) OUTDOOR TEMPERATURE (Degree F) INDOOR ENTERING INDOOR ENTERING...
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Page 31: Section 20. Refrigerant Circuit (Only For Reference)
Section 20. Refrigerant Circuit (only for reference) Heating Refrigeration Cycle Cooling Refrigeration Cycle Printed from D159360 18-BC120D1-1A-EN... - Page 32 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.
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