Trane TWA240E 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 TWA240E Specifications

General

Brand	Trane
Model	TWA240E
Category	Heat Pump
Language	English

Summary

Application Guide

Tube Size and Component Selection

Guide for selecting tube size and components for TTA/TWA split systems using R-410A refrigerant.

Warnings, Cautions and Notices

Responsible Refrigerant Practices

Emphasizes technician certification and adherence to laws for responsible refrigerant management.

Personal Protective Equipment (PPE) Required

Mandates the use of PPE for technician safety when working with hazardous electrical, mechanical, or chemical hazards.

Updated Guidelines

Suction Lines

Explains R-410A's higher pressure drop tolerance in suction lines and the need to maintain oil-entrainment velocities.

Line Sizing, Routing, and Component Selection

Liquid Lines

Covers proper liquid line sizing, routing, insulation, and component selection for TTA/TWA systems.

Component Details

Expansion Valves

Gas Line

Line Sizing and Routing

Expansion Valves

Expansion Valve Function and Selection

Superheat Adjustment

Remodel, Retrofit, or Replacement

System Compatibility and Component Analysis

Details the requirements for converting systems to R-410A, ensuring component compatibility with refrigerant and oil.

R-410A Refrigerant Safety Warning

Reiterates the warning about R-410A's higher pressure and the risks of using incompatible equipment.

Parts

TTA Component Selection Summary

TWA Component Selection Summary