Trane TWA073D - 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 TWA073D Specifications

General

Brand	Trane
Model	TWA073D
Category	Heat Pump
Language	English

Summary

Warnings, Cautions and Notices

Personal Protective Equipment (PPE) Required

Mandates the use of Personal Protective Equipment (PPE) for installation and servicing to prevent hazards.

Introduction

R-410 A Refrigerant Safety

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

Updated Guidelines

Equipment Placement

Minimize Distance Between Components

Provides recommendations for siting units and routing lines to minimize refrigerant charge and maximize reliability.

Line Sizing, Routing, and Component Selection

Liquid Lines

Details on proper liquid line sizing, routing, insulation, and necessary components.

Gas Line

Expansion Valves

Expansion Valves

Explains the function and selection of expansion valves for proper refrigerant metering.

Controls

Remodel, Retrofit, or Replacement

R-410 A Conversion Safety

Warns about R-410A pressure and component compatibility during system upgrades.

Refrigerant Piping Examples

Parts

Expansion Valves for TTA;TWA

Lists expansion valve models, tonnage ranges, and Trane part numbers for TTA/TWA systems.