© 2009 Trane All rights reserved SS-APG008-EN
Introduction
This application guide provides refrigerant piping guidelines for Trane® Models TTA and TWA air-
cooled condensing units that range in size from 6 through 20 tons. Use the information presented
here to properly select interconnecting piping and refrigerant components for these systems.
These systems are designed and intended for the use of R-410A and POE oil. All components of the
system must also be designed and intended for R-410A and POE oil.
This publication also outlines an “envelope” of application that is based on the proximity of the
refrigerant components. The guidelines presented pertain specifically to the operating envelope
for standard air-conditioning applications that deliver either a constant or variable volume of
airflow and that provide no more than 45 percent ventilation (outdoor) air.
Prospective applications outside this operating envelope—including low-ambient, process, and
100-percent outdoor-air applications—must be reviewed by Trane to help ensure proper
performance.
WARNING
R-410A Refrigerant under Higher Pressure than R-22!
The units described in this manual use R-410A refrigerant, which operates at higher pressures
than R-22 refrigerant. Use ONLY R-410A rated service equipment or components with this unit.
For specific handling concerns with R-410A, please contact your local Trane representative.
Failure to use R-410A rated service equipment or components could result in equipment or
components exploding under R-410A high pressures which could result in death, serious injury,
or equipment damage.
Trademarks
Trane and the Trane logo are trademarks of Trane in the United States and other countries. All
trademarks referenced in this document are the trademarks of their respective owners.
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