Trane 4TWB3024D - User Manual

18-BC85D1-2
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.
4TWB3018–060
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

Trane 4TWB3024D Specifications

General

Model	4TWB3024D
Type	Heat Pump
Cooling Capacity (BTU/h)	24000
Heating Capacity (BTU/h)	24000
Refrigerant	R-410A
Voltage	208/230
Phase	1
Compressor Type	Scroll

Summary

Safety Information

Outdoor Unit Location Considerations

Unit Dimensions and Weight

Details unit dimensions and estimated weight for various models.

Refrigerant Piping Limits

Specifies maximum refrigerant line length and vertical change limits.

Suggested Locations for Best Reliability

Provides guidance on optimal outdoor unit placement for performance and longevity.

Cold Climate Considerations

Offers precautions for installing units in areas with snow and freezing temperatures.

Coastal Considerations

Addresses requirements for units installed near salt water environments.

Unit Preparation for Installation

Prepare the Unit for Installation

Outlines steps for preparing the unit before installation, including damage checks.

Setting the Outdoor Unit

Pad Installation Guidelines

Details requirements for installing the outdoor unit on a support pad.

Refrigerant Line Handling and Specifications

Refrigerant Line and Service Valve Connection Sizes

Provides a table of connection sizes for refrigerant lines and service valves by model.

Factory Refrigerant Charge

Explains the factory refrigerant charge and when adjustments are necessary.

Required Refrigerant Line Length and Lift

Instructs users to determine and record required refrigerant line length and lift.

Refrigerant Line Insulation Requirements

Emphasizes the importance of insulating the vapor line and preventing metal-to-metal contact.

Reuse of Existing Refrigerant Lines

Provides precautions for using existing refrigerant lines and ensuring compatibility.

Refrigerant Line Routing Procedures

Routing Precautions

Details precautions for routing refrigerant lines to prevent noise and vibration transmission.

Refrigerant Line Brazing Process

Brazing the Refrigerant Lines

Provides step-by-step instructions for brazing refrigerant lines.

Refrigerant Line Leak Detection

Checking for Refrigerant Leaks

Details the procedure for checking refrigerant lines for leaks using nitrogen and soapy solution.

System Evacuation Procedure

Evacuating Refrigerant Lines and Indoor Coil

Explains the process of evacuating refrigerant lines and the indoor coil to a specific micron level.

Service Valve Operations

Opening the Gas Service Valve

Provides instructions for opening the gas service valve.

Opening the Liquid Service Valve

Details the procedure for opening the liquid service valve with caution.

Low Voltage Electrical Connections

Low Voltage Maximum Wire Lengths

Specifies the maximum allowable lengths for low voltage wiring based on wire gauge.

Low Voltage Hook-up Diagrams

Illustrates low voltage wiring diagrams for communicating and variable speed furnace hook-ups.

TAM7 Air Handler Hook-up Diagram

Shows the low voltage wiring connections for the TAM7 Air Handler.

TAM4 Air Handler Hook-up Diagram

Illustrates the low voltage wiring connections for the TAM4 Air Handler.

GAM5 Air Handler Hook-up Diagram

Depicts the low voltage wiring for the GAM5 Air Handler model.

GAM2 Air Handler Hook-up Diagram

Shows the low voltage wiring connections for the GAM2 Air Handler.

GAF2 Air Handler Hook-up Diagram

Illustrates the low voltage wiring for the GAF2 Air Handler.

GAF2-36 M Air Handler Hook-up Diagram

Details the low voltage wiring connections for the GAF2-36M Air Handler.

Defrost Control Operation

Explains defrost control settings, pin identification, and checkout procedures.

Defrost Control Pin Identification

Identifies the function of various pins on the defrost control board.

Defrost Control Checkout Procedure

Outlines the steps for checking the defrost control's operation.

High Voltage Electrical Installation

High Voltage Power Supply Requirements

Discusses requirements for the high voltage power supply and compliance with codes.

High Voltage Disconnect Switch Installation

Recommends installing a separate disconnect switch for high voltage connections.

High Voltage Grounding

Specifies the requirement to ground the outdoor unit according to codes.

System Start-Up Procedure

System Start Up Steps

Provides a step-by-step guide for starting up the installed system.

System Refrigerant Charge Adjustment

Temperature Measurements for Charging

Guides on taking necessary temperature measurements for charging.

Subcooling Charging in Cooling (Above 55°F Outdoor)

Details the subcooling method for charging in cooling mode above 55°F ambient.

Subcooling Charging Below 55°F Outdoor (Heating Only)

Explains charging for heating mode below 55°F outdoor temperature.

Installation Checkout and Troubleshooting

Operational and Checkout Procedures

Lists operational and checkout procedures for ensuring proper system performance.

System Troubleshooting Guide

Provides a system faults table to help diagnose and troubleshoot common issues.