Trane TTA240E User Manual

October 2009
SS-APG008-EN
Tube Size and Component
Selection
for TTA and TWA Split Systems (6-20 Tons)
Using Refrigerant 410A
Model Numbers:
TTA073D TTA090D TTA120D
TTA120E TTA120F TTA150E
TTA180E TTA180F TTA240E
TTA240F TWA073D TWA120D
TWA180E TWA240E TWA090
Application Guide

Trane TTA240E Specifications

General

Brand	Trane
Model	TTA240E
Category	Heat Pump
Language	English

Summary

Tube Size and Component Selection

Warnings, Cautions and Notices

Hazard Definitions and Guidelines

Defines hazard symbols (Warning, Caution, Notice) and their implications for safety.

Personal Protective Equipment (PPE) Requirements

Outlines mandatory PPE usage for technician safety during installation and servicing.

Introduction

System Overview and Purpose

R-410A Refrigerant Warning

Warns about R-410A operating at higher pressures than R-22 and the need for compatible equipment.

Updated Guidelines

Liquid and Suction Line Considerations

Line Sizing, Routing, and Component Selection

Liquid Lines: Sizing, Routing, and Insulation

Liquid Lines: Components

Liquid Line Safety and Control Components

Risk of Explosion with Refrigerant Line

Warns about the risk of explosion from pressurized liquid refrigerant trapped between valves.

Expansion Valve

Describes the role of the expansion valve in metering refrigerant and ensuring proper coil distribution.

Check Valves

Gas Line

Gas Line: Sizing, Routing, and Underground Avoidance

Expansion Valves

Expansion Valve Function and Selection

Explains expansion valve function, selection based on coil capacity, and adjustment for superheat.

Remodel, Retrofit, or Replacement

System Upgrade and Component Compatibility

Discusses upgrading systems to R-410A, POE oil, and critical component compatibility checks.

Oil Handling and Contamination Risks

Addresses POE oil's hygroscopic nature, mineral oil removal, and proper handling to prevent compressor failure.

Parts

Table 2: TTA Component Selection Summary

Table 3: TWA Component Selection Summary

Table 4: Expansion Valves for TTA/TWA