Trane 4TTZ0 User Manual

18-BC53D2-6
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.
Air Conditioner/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 A.H.R.I. rated only with TXV/EEV indoor systems. Some of the benefits of installing approved matched indoor and
outdoor split systems are maximum efficiency, optimum performance and the best overall system reliability.
4TTZ0/4TWZ0 with ComfortLink
TM
II and Charge Assist
TM
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 .................................................... 12
Section 12. Electrical - High Voltage ................................................... 17
Section 13. Start Up .............................................................................. 18
Section 14. System Charge Adjustment ............................................. 19
Section 15. Checkout Procedures and Troubleshooting ................... 30

Trane 4TTZ0 Specifications

General

Brand	Trane
Model	4TTZ0
Category	Air Conditioner
Language	English

Summary

Section 1. Safety

Safety Warnings and Precautions

Covers electrical safety, R-410A refrigerant hazards, compressor dome temperature, and line reuse.

Section 2. Unit Location Considerations

Unit Dimensions and Refrigerant Piping Limits

Details unit dimensions, weight, and refrigerant line length/lift limitations.

Location Guidelines and Cold Climate Operation

Best practices for unit placement and cold weather heat pump operation.

Section 3. Unit Preparation

Unit Inspection and Preparation Steps

Steps for checking unit for damage and preparing for installation.

Section 4. Setting the Unit

Support Pad Installation Requirements

Guidelines for installing the unit on a proper support pad.

Section 5. Refrigerant Line Considerations

Line Sizes, Factory Charge, and Insulation

Covers connection sizes, factory charge, and vapor line insulation.

Refrigerant Line Length and Lift Measurement

Prompts to record total line length and vertical change (lift).

Reuse Lines and Routing Precautions

Precautions for reusing existing refrigerant lines and routing guidelines.

Section 7. Refrigerant Line Brazing

Brazing Refrigerant Lines to Service Valves

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

Section 8. Refrigerant Line Leak Check

Pressure Testing for Refrigerant Leaks

Procedure to pressurize system with nitrogen and check for leaks.

Section 9. Evacuation

System Evacuation Procedure

Steps for evacuating the refrigerant lines and indoor coil to a specific micron level.

Section 10. Service Valves

Opening Gas and Liquid Service Valves

Instructions for safely opening the gas and liquid service valves.

Section 11. Electrical - Low Voltage

Low Voltage Wiring and Wire Lengths

Details on maximum wire lengths for low voltage control wiring.

Communicating System Low Voltage Hook-up

Diagrams showing low voltage wiring for communicating systems.

TAM7 Air Handler 24V Control Wiring

Wiring diagrams for TAM7 Air Handler with 24V control.

Communicating Indoor Unit 24V Control Wiring

Wiring diagrams for communicating indoor units with 24V control.

Defrost Control Operation and Checkout

Explains defrost control, fault identification, and checkout steps.

Section 12. Electrical - High Voltage

High Voltage Power Supply, Disconnect, and Grounding

Covers power supply, disconnect switch installation, and grounding requirements.

Section 13. Start Up

System Start Up Procedure

Step-by-step guide to safely start the system after installation.

Section 14. System Charge Adjustment

Temperature Measurements and Subcooling Charging (Cooling > 55°F)

Measuring temperatures and performing subcooling charge in cooling mode above 55°F.

Subcool Charging Table Corrections

Tables to adjust subcooling charge based on line length and rise.

Charge Assist™™ Procedure

Detailed instructions for using the Charge Assist™™ feature for charge adjustment.

Manual Charging Procedure in Cooling (55-120°F OD)

Procedure for manual charging in cooling mode within a specific outdoor temperature range.

R410A Refrigerant Charging Chart

Chart for determining proper charge using liquid temperature and dip switch settings.

R410A Refrigerant Charging Charts (Continued)

Additional R410A refrigerant charging charts for various tonnages and models.

Adjust Refrigerant Level and Verify Performance

Steps to adjust refrigerant level and verify system performance.

Subcooling Charging in Heating Mode (Below 55°F OD)

Procedure for subcooling charge in heating mode below 55°F outdoor temperature.

Measure Suction Line Pressure and Temperature

Steps for measuring suction line pressure and temperature.

15 Degree Superheat Chart and Adjustment

Chart and procedure for adjusting refrigerant to achieve 15 degrees superheat.

System Stabilization and Performance Verification

Final stabilization steps and verifying system performance.

Section 15. Checkout Procedures and Troubleshooting

Operational and Checkout Procedures Checklist

A comprehensive checklist for final installation inspection and system checkout.

System Faults and Potential Causes

A table listing system faults and their primary/secondary causes.