TRANE Diagnostic Troubleshooting Repair

Model
RTAA 70-125 Ton
RTWA 70-125 Ton
RTUA 70-125 Ton

Contents
General Information
Service Philosophy
System Description
System Level Components
Interprocessor Communications
IPC Diagnostics
Troubleshooting Modules Using IPC Diagnostics
Troubleshooting Procedure
Temperature Sensor Checkout
Temperature Sensor Checkout Procedure
Compressor Operation
Restart Inhibit Timer
Compressor Start/Stop
Variable Speed Inverter/Condenser Fan Control
Outdoor Air Temperature and Fan Control
VSF Inverter Fault
Current Transformer
CT and MCSP Compressor Current Input Checkout Procedure
Under-Over Voltage Transformer
Under-Over Voltage Transformer Checkout
Compressor Capacity
Checkout Procedure for MCSP Load/Unload Outputs
Checkout Procedure for the Slide Valve and Load/Unload Solenoids
Checkout Procedure for MCSP Step Load Output
Checkout Procedure for Step Load Solenoid Valve and Piston
Module Power and Miscellaneous I/O
Power Supply
Clear Language Display (CLD) 1U6 Keypad Overview
Chiller Module (CPM) (1U1)
Options Module (CSR) (1U2)
Electronic Expansion Valve Module (EXV) (1U3)
Compressor Module (MCSP) (1U4 AND 1U5)
Interprocessor Communication Bridge Module (IPCB) (1U7)
LonTalk® Communications Interface - Chillers Module (LCI-C) (1U8)
Variable Speed Fan System
Inverter Diagnostics
Troubleshooting Procedure
Other Service Features
Service Pumpdown
Circuit Lockout
Circuit Diagnostic Reset
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