Trane 4TWX7048E User Manual

18-BC109D1-1A-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
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.
4TWX7
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 ..................................................... 8
Section 7. Refrigerant Line Brazing ...................................................... 9
Section 8. Refrigerant Line Leak Check ............................................. 11
Section 9. Evacuation .......................................................................... 12
Section 10. Service Valves .................................................................. 12
Section 11. Electrical - Low Voltage ................................................... 13
Section 12. Electrical - High Voltage .................................................. 15
Section 13. Start Up.............................................................................. 16
Section 14. System Charge Adjustment............................................. 17
Section 15. Checkout Procedures and Troubleshooting .................. 23

Trane 4TWX7048E Specifications

General

Model	4TWX7048E
Type	Heat Pump
Cooling Capacity (BTU/h)	48000
Heating Capacity (BTU/h)	48000
Cooling Capacity	4 tons
Heating Capacity	4 tons
SEER Rating	16
Refrigerant	R-410A
Compressor Type	Scroll
Voltage	208/230
Phase	1
Sound Level (Outdoor Unit)	69

Summary

Section 1. Safety

Safety Warnings and Precautions

Covers electrical hazards, refrigerant handling, and operational safety warnings.

Section 7. Refrigerant Line Brazing

Brazing Refrigerant Lines

Step-by-step instructions for brazing refrigerant lines to service valves.

Section 8. Refrigerant Line Leak Check

Checking for Refrigerant Leaks

Procedure for pressurizing lines with nitrogen and checking for leaks.

Section 9. Evacuation

Evacuating Refrigerant Lines and Coil

Steps for evacuating the system to a specific micron level.

Section 10. Service Valves

Opening the Gas Service Valve

Procedure for safely opening the gas service valve on the unit.

Opening the Liquid Service Valve

Procedure for safely opening the liquid service valve, with critical warnings.

Section 13. Start Up

System Start Up Procedure

Section 14. System Charge Adjustment

Temperature Measurements for Charging

Subcooling Charging in Cooling

Detailed method for charging the system using subcooling above 55°F outdoor temperature.

Charging Below 55°F Outdoor Temp. (Heating)

Method for charging in heating mode when outdoor temperature is below 55°F.

Section 15. Checkout Procedures and Troubleshooting

Operational and Checkout Procedures

Troubleshooting System Faults

Table identifying system faults and their primary and secondary causes.