Trane ComfortLink II 4TWL9048A1000B User Manual

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Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning
equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person
could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that
are attached to the equipment.
October 2021
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Variable Speed ComfortLink™™ II
Side Discharge HP Models
For coastal applications where units are installed within one (1) mile of salt water, epoxy coated models are recommended. These models
have an 8 week lead time after order.
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4TWL9036A1000B
4TWL9048A1000B
4TWL9060A1000B
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4TWL9036A1COTB
4TWL9048A1COTB
4TWL9060A1COTB
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Installer’s Guide

Trane ComfortLink II 4TWL9048A1000B Specifications

General

Type	Air Conditioner
Model	4TWL9048A1000B
Brand	Trane
Product Line	ComfortLink II
Cooling Capacity	4 Ton
Cooling Capacity BTU/H	48000
Refrigerant	R-410A
Energy Star Certified	Yes
Stages	Two-stage
Voltage	208/230V
Phase	1
Compressor Type	Climatuff
Warranty	10 years

Summary

Unit Location Considerations

Suggested Locations for Best Reliability

Provides guidance on optimal placement for reliable operation and airflow.

Refrigerant Line Brazing

Service Valves

Open the Gas Service Valve

Open the Liquid Service Valve

Electrical – High Voltage

High Voltage Power Supply

Details requirements for the high voltage power supply.

High Voltage Disconnect Switch

Instructions for installing and using a high voltage disconnect switch.

System Charge Adjustment

Subcooling Charging Corrections

Explains how to determine subcooling corrections based on line length and lift.

Charging and Correction Charts

Subcool Charging Correction Charts

Charging the Unit

Proper Gage Pressure

Verify Performance

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

Communicating Display Assembly (CDA)

Defrost Control (HP Only)

Explains demand defrost control logic and initiation for heat pumps.

Checkout Procedures