Trane 4TTX8024A User Manual

18-AC95D1-1
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.
Condensing Units
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.
4TTX8
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 ...................22

Trane 4TTX8024A Specifications

General

Type	Air Conditioner
Model	4TTX8024A
Refrigerant	R-410A
Voltage	208/230V
Phase	1
Cooling Capacity	24, 000 BTU/H
Compressor Type	Scroll
Sound Level	72 dB

Summary

Safety Precautions and Warnings

General Safety and Liability

Intended for qualified personnel; manufacturer disclaims liability.

Electrical Safety Hazards

Warning about live electrical components during installation and service.

R-410A Refrigerant Handling

Precautions for R-410A, high pressures, and POE oil.

Liquid Line Service Valve Safety

Extreme caution when opening liquid line service valve.

Brazing and Compressor Cautions

Cautions on brazing joints and hot compressor dome temperatures.

Unit Location and Piping Limits

Unit Dimensions and Weight

Physical dimensions and estimated weight of condensing units.

Refrigerant Piping Length and Lift

Maximum refrigerant line length and vertical change limits.

Optimal Unit Placement and Coastal Issues

Suggested Locations for Reliability

Clearance requirements for airflow, noise, and roof runoff.

Coastal Installation Corrosion Protection

Measures for units installed near saltwater environments.

Unit Preparation and Setting

Unit Preparation Steps

Checking for damage and removing the unit from its pallet.

Support Pad Installation Requirements

Guidelines for installing the unit on a concrete slab or pad.

Refrigerant Line Specifications

Line Sizes and Valve Connections

Table of refrigerant line and service valve connection sizes.

Factory Charge and Adjustment Basis

Understanding factory charge and when adjustments are needed.

Refrigerant Line Length and Lift Recording

Recording line length and lift for system charge adjustment.

Vapor Line Insulation Necessity

Importance of insulating the vapor line and avoiding metal contact.

Refrigerant Line Routing

Noise Prevention in Routing

Precautions to prevent vibration transmission and noise.

Line Set Isolation Techniques

Methods for isolating lines from structural elements and ductwork.

Refrigerant Line Brazing

Brazing Preparation and Cleaning

Steps for deburring and cleaning pipe ends before brazing.

Brazing Procedure and Component Protection

Nitrogen Purge and Heat Protection

Purging with nitrogen and protecting components during brazing.

Refrigerant Line Leak Check

Leak Detection Method

Pressurizing with nitrogen and checking for leaks with soapy solution.

System Evacuation and Service Valves

Evacuation to Micron Standards

Using a micron gauge to achieve proper vacuum levels.

Opening the Gas Service Valve

Procedure for opening the gas service valve after evacuation.

Opening the Liquid Service Valve

Liquid Service Valve Operation

Safe steps for opening the liquid line service valve.

Low Voltage Wiring Diagrams

Low Voltage Wire Length Guidelines

Table of maximum lengths for low voltage wiring.

Variable Speed Air Handler Wiring

Wiring connections for VS air handler and thermostat.

Indoor Unit Wiring Connections

Communicating Indoor Unit Wiring

Wiring diagram for communicating indoor units.

AM7 Air Handler Wiring Diagram

Hook-up diagram for the AM7 Air Handler.

Furnace Wiring Connections

Variable Speed Furnace Wiring

Wiring diagram for variable speed furnace installation.

High Voltage Electrical Requirements

High Voltage Power Supply Compliance

Ensuring power supply matches nameplate and codes.

Disconnect Switch and Conduit Use

Requirement for disconnect switch and flexible conduit.

High Voltage Grounding Standards

Grounding the outdoor unit per national, state, and local codes.

System Start Up Procedure

System Power-Up Sequence

Steps for safely turning on power and starting the unit.

System Charge Adjustment

Temperature Measurement for Charging

Measuring outdoor and indoor temperatures for accurate charging.

Subcooling Charging Method Introduction

Overview of the subcooling method for system charging.

Subcooling Correction Calculations

Determining Subcooling Corrections

Using charts with line length and lift for charge corrections.

Liquid Line Measurement and Chart Lookup

Measuring Liquid Line Parameters

Measuring liquid line temperature and pressure at the service valve.

R-410A Charging Chart Usage

Using the charging chart to find proper liquid gage pressure.

Adjusting and Verifying System Charge

Refrigerant Level Adjustment

Adding or recovering refrigerant to match target pressure.

System Stabilization and Performance Check

Stabilizing the system and verifying performance with pressure curves.

Checkout Procedures

Operational Checkout Checklist

Final inspection points for system operation and safety checks.

System Troubleshooting Guide

Troubleshooting Faults and Causes

Table identifying system faults and their primary/secondary causes.