Trane 4TWB3048B - 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 4TWB3048B Specifications

General

Brand	Trane
Model	4TWB3048B
Category	Heat Pump
Language	English

Summary

Safety

General Safety Warnings and Precautions

Covers essential safety warnings regarding electrical components, refrigerant handling, and operational hazards.

Unit Location Considerations

Unit Dimensions and Weight

Provides physical specifications and weight for outdoor units.

Refrigerant Piping Limits

Specifies maximum allowed refrigerant line length and vertical change.

Suggested Locations for Best Reliability

Recommends optimal placement for unit performance and noise reduction.

Cold Climate Considerations

Advises on precautions for installations in areas with snow and freezing temperatures.

Coastal Considerations

Details requirements for installations near salt water.

Unit Preparation and Setting

Prepare The Unit For Installation

Steps for checking and removing the unit from its packaging.

Pad Installation

Guidelines for selecting and installing a support pad for the outdoor unit.

Refrigerant Line Considerations

Refrigerant Line and Service Valve Connection Sizes

Details the required sizes for refrigerant lines and service valve connections.

Factory Charge

Explains the initial refrigerant charge and when adjustments are needed.

Required Refrigerant Line Length

Instructions to determine and record line length and vertical change.

Refrigerant Line Insulation

Emphasizes the importance of insulating the vapor line.

Reuse Existing Refrigerant Lines

Precautions for using existing refrigerant lines in retrofit applications.

Refrigerant Line Routing and Brazing

Refrigerant Line Routing

Guidelines for proper routing to prevent noise and ensure proper function.

Braze The Refrigerant Lines

Step-by-step instructions for brazing refrigerant lines.

Refrigerant Line Leak Check and Evacuation

Check For Leaks

Procedure for pressurizing and checking refrigerant lines for leaks.

Evacuate the Refrigerant Lines and Indoor Coil

Steps for evacuating the system to remove moisture and non-condensables.

Service Valves Operation

Open the Gas Service Valve

Instructions for safely opening the gas service valve.

Open the Liquid Service Valve

Detailed procedure and warning for opening the liquid service valve.

Electrical - Low Voltage

Low Voltage Maximum Wire Length

Table detailing maximum wire lengths based on wire gauge.

Low Voltage Hook-up Diagrams

Wiring diagrams for various indoor unit and thermostat connections.

Electrical - High Voltage

High Voltage Power Supply

Requirements for the high voltage power supply and compliance.

High Voltage Disconnect Switch

Instruction to install a separate disconnect switch for the outdoor unit.

High Voltage Ground

Guidance on grounding the outdoor unit according to codes.

System Start Up

System Start Up

Step-by-step procedure for turning on and starting the system.

System Charge Adjustment

Temperature Measurements

Instructions for measuring indoor and outdoor temperatures for charging.

Subcooling Charging in Cooling

Method for adjusting refrigerant charge based on subcooling above 55°F ambient.

Subcooling Charging Charts

Charts to determine subcooling corrections based on line length and lift.

R-410 A Refrigerant Charging Chart

Table to determine liquid gauge pressure using final subcooling and liquid temperature.

Adjust Refrigerant Level

Procedures for adding or recovering refrigerant to achieve proper charge.

Verify Typical Performance

Guidance on verifying system performance after charging.

Subcooling Charging Below 55°F Outdoor Temp.

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

Tubing Information

Table showing refrigerant amounts to add based on tubing length and tonnage.

Checkout Procedures and Troubleshooting

Operational And Checkout Procedures

List of checks to ensure proper installation and operation.

System Faults

Table detailing system faults and their primary/secondary causes.