Trane 4TWR4 User Manual

18-BC95D1-5E-EN
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
4TWR4
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.
Installation and Operation Manual
Table of Contents
Section 1. Safety ..................................................................................... 2
Section 2. Unit Location Considerations ............................................. 4
Section 3. Unit Preparation .................................................................... 5
Section 4. Setting the Unit ..................................................................... 5
Section 5. Refrigerant Line Considerations ......................................... 5
Section 6. Refrigerant Line Routing ..................................................... 6
Section 7. Refrigerant Line Brazing ...................................................... 8
Section 8. Refrigerant Line Leak Check ............................................... 8
Section 9. Evacuation ............................................................................ 9
Section 10. Service Valves .................................................................... 9
Section 11. Electrical - Low Voltage ................................................... 10
Section 12. Electrical - High Voltage .................................................. 11
Section 13. Start Up .............................................................................. 12
Section 14. System Charge Adjustment ............................................. 12
Section 15. Checkout Procedures ...................................................... 16
Section 16. Defrost Control ................................................................. 17
Section 17. Troubleshooting ............................................................... 20
Section 18. Wiring Diagrams ............................................................... 22
Section 19. Pressure Curves ............................................................... 25
Section 20. Refrigerant Circuit ............................................................ 30

Trane 4TWR4 Specifications

General

Refrigerant	R-410A
Type	Heat Pump
Warranty	10 Year Limited Warranty on compressor
Stages	Single Stage
Cooling Capacity	2 to 5 Tons
Cooling Capacity (BTU/h)	24, 000 to 60, 000
Heating Capacity (BTU/h)	24, 000 to 60, 000

Summary

Section 1. Safety

General Safety Warnings and Cautions

Essential safety guidelines for handling the unit and its components.

Refrigerant Handling and Grounding Requirements

Procedures for safe refrigerant management and electrical grounding.

Electrical and Thermal Hazards

Warnings about dangerous electrical voltages and hot surfaces.

Brazing Safety and Chemical Exposure Notice

Precautions for brazing and important chemical safety information.

Section 5. Refrigerant Line Considerations

Line Sizes, Factory Charge, and Connections

Section 7. Refrigerant Line Brazing

Refrigerant Line Brazing Procedure

Step-by-step instructions for brazing refrigerant lines correctly.

Section 8. Refrigerant Line Leak Check

Leak Check Procedure

Section 9. Evacuation

Evacuating Refrigerant Lines and Indoor Coil

Section 10. Service Valves

Opening Gas and Liquid Service Valves

Section 11. Electrical - Low Voltage

Low Voltage Wiring Limits and Hook-up Diagrams

Defrost Control for 036 Model Specifics

Defrost Control for Multiple Models

Section 12. Electrical - High Voltage

High Voltage Power Supply and Grounding Requirements

High Voltage Disconnect Switch Installation

Section 14. System Charge Adjustment

Temperature Measurements for System Charging

Key temperature readings required for accurate system charging.

Subcooling Charging Method (Above 55°F Outdoor)

Procedure for charging based on subcooling at higher outdoor temperatures.

Special Subcooling Applications and Charging Chart

Specific subcooling scenarios and the associated charging chart.

Charging Below 55°F Outdoor Using Weigh-In Method

Method for charging at low temperatures and using the weigh-in technique.

Section 15. Checkout Procedures

Section 16. Defrost Control

Defrost Control Operation and Fault Detection

Pin Identification and Control Checkout

Test Sensors and Resistance Interpretation

Section 17. Troubleshooting

Compressor Start Failure Diagnosis

Flowchart to diagnose issues when the compressor fails to start.

Compressor Running Issues Diagnosis

Flowchart to diagnose problems when the compressor runs incorrectly.

TXV and Heating Mode Performance Troubleshooting

Steps to troubleshoot TXV issues and heating mode performance.

Section 18. Wiring Diagrams

Wiring Diagram for 017N, 042N, 048N & 060N Models

Wiring Diagram for 018N, 024N, 030N & 036N Models

Section 19. Pressure Curves