Trane 4TWR5018G - User Manual

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18-BC76D1-8

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 informa-

tion 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 A.H.R.I. 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.

4TWR5

Installer’s Guide

Table of Contents

Section 1. Safety ..................................................................................... 2

Section 2. Unit Location Considerations.............................................. 3

Section 3. Unit Preparation .................................................................... 5

Section 4. Setting the Unit ..................................................................... 5

Section 5. Refrigerant Line Considerations ......................................... 6

Section 6. Refrigerant Line Routing ..................................................... 7

Section 7. Refrigerant Line Brazing ...................................................... 8

Section 8. Refrigerant Line Leak Check .............................................10

Section 9. Evacuation ........................................................................... 11

Section 10. Service Valves ................................................................... 11

Section 11. Electrical - Low Voltage .................................................... 13

Section 12. Electrical - High Voltage ................................................... 16

Section 13. Start Up .............................................................................. 17

Section 14. System Charge Adjustment ............................................. 18

Section 15. Checkout Procedures and Troubleshooting ................... 23

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This document is an Installer's Guide for Trane 4TWR5 Heat Pumps, providing comprehensive instructions for installation, operation, and maintenance. It emphasizes compliance with national, state, and local codes throughout all installation phases.

Function Description:

The Trane 4TWR5 Heat Pump is an outdoor condensing unit designed for residential and light commercial heating and cooling applications. It functions as part of a split system, working in conjunction with an indoor evaporative coil or air handler to provide climate control. The guide specifically addresses heat pump models, indicating their dual capability for both heating and cooling. The system utilizes R-410A refrigerant, which operates at higher pressures than older R-22 systems.

Important Technical Specifications:

Refrigerant: R-410A. Requires R-410A approved service equipment and POE compressor oil.
Operating Pressures: 50 to 70% higher than R-22 systems.
Unit Dimensions and Weight (Estimated):
- 4TWR5018G: 29 x 30 x 33 inches, 204 lbs
- 4TWR5024G: 33 x 30 x 33 inches, 236 lbs
- 4TWR5030G: 33 x 34 x 37 inches, 283 lbs
- 4TWR5036G: 33 x 34 x 37 inches, 261 lbs
- 4TWR5042G: 37 x 34 x 37 inches, 278 lbs
- 4TWR5049E: 45 x 34 x 37 inches, 331 lbs
- 4TWR5061E: 45 x 34 x 37 inches, 332 lbs
Refrigerant Line Limits:
- Maximum horizontal length: 60 feet.
- Maximum vertical change: 60 feet (except 061 Heat Pump, restricted to 30 ft).
Service Valve Connection Sizes:
- 4TWR5018G, 4TWR5024G: Vapor Line 5/8", Liquid Line 3/8"
- 4TWR5030G, 4TWR5036G, 4TWR5042G: Vapor Line 3/4", Liquid Line 3/8"
- 4TWR5049E: Vapor Line 7/8", Liquid Line 3/8"
- 4TWR5061E: Vapor Line 1-1/8", Liquid Line 3/8"
Low Voltage Wiring (24 VOLTS):
- 18 AWG: Max. 150 Ft.
- 16 AWG: Max. 225 Ft.
- 14 AWG: Max. 300 Ft.
Factory Charge: Includes charge for the outdoor unit, 15 feet of connecting line, and the smallest indoor evaporative coil match. Adjustments are needed for longer lines or larger indoor coils.
Defrost Control: Selectable termination temperature (47°F as shipped, or 70°F when ambient is below 30°F by cutting Jumper J2). Features include TEST_COMMON, TST (test mode), and FRC_DFT (forced defrost).

Usage Features:

Installation Flexibility: The guide provides recommendations for unit placement, including considerations for roof mounting, sound/vibration isolation, and clearances from obstructions (5 feet above, 3 feet in front of access panels, 12 inches from walls/shrubbery).
Cold Climate Considerations: For areas with snow accumulation, units should be elevated 3-12 inches above the pad/rooftop to allow for defrost water drainage. Snow drift barriers are recommended.
Refrigerant Line Routing: Emphasizes precautions to prevent noise and vibration transmission. Isolation hangers are recommended when fastening lines to structural elements. Lines should be insulated and isolated from ductwork.
System Start-Up: Includes a step-by-step process: ensuring completion of installation steps, setting thermostat to OFF, applying power, waiting one hour if a crankcase heater accessory is used and ambient is below 70°F, then setting thermostat to ON.
System Charge Adjustment:
- Subcooling Charging (Cooling, above 55°F outdoor temp): The primary method, involving measuring liquid line temperature and pressure, and using a charging chart (Table 14.2) to determine the correct liquid gage pressure.
- Weighing in Charge (Heating, below 55°F outdoor temp): The only recommended method for charging in heating mode at low outdoor ambient temperatures, using nameplate charge and additional charge from Table 14.3 based on line length.
Hook-up Diagrams: Detailed low voltage wiring diagrams are provided for Air Handler, Communicating Indoor Unit with 24V Control, Variable Speed Furnace, and *AM4 & GAM5 Air Handler configurations, including specific notes for jumper settings and control modes.

Maintenance Features:

Refrigerant System Integrity: Instructions for brazing refrigerant lines, including purging with dry nitrogen and using wet rags to prevent heat damage to service valves and the basepan.
Leak Check: After brazing, the system must be pressurized to 150 PSIG with dry nitrogen and checked for leaks using a soapy solution.
Evacuation: The system must be evacuated to no higher than 350 microns, and the vacuum must hold below 500 microns for one minute.
Service Valve Operation: Detailed steps for opening both gas and liquid service valves, emphasizing caution for the liquid line valve to prevent abrupt release of system charge.
Electrical Connections: High voltage power supply must match equipment nameplate. A separate disconnect switch is required at the outdoor unit, and the unit must be grounded.
System Stabilization: Before accurate charge measurements, the system must operate for a minimum of 20 minutes to stabilize after startup or any charge adjustments.
Checkout Procedures: A comprehensive checklist for verifying proper installation and operation, including leak checks, insulation, securing lines, sealing passages, electrical connections, fan observation, drain line function, register/grille openness, return air filter installation, correct airflow setting, and overall system operation in all modes.
Troubleshooting Guide: A detailed table of "SYSTEM FAULTS" categorized by "REFRIGERANT CIRCUIT" and "ELECTRICAL," listing primary and secondary causes for various issues (e.g., head pressure too high/low, suction pressure too high/low, compressor won't start, defrost problems). This aids in diagnosing and resolving operational issues.