Trane RTWA 70-125 TON User Manual

Diagnostic troubleshooting repair, Series r

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This manual is related to the following products:

RTUA 70-125 TON, RTAA 70-125 TON

Table of contents

Document Outline

Service Philosophy
System Description
System Level Components
- Description
- Chiller Module (CPM) IU1
- Compressor Module (MCSP) 1U4 and 1U5
- Expansion Valve Module (EXV) 1U3
- Options Module (CSR) 1U2
- Clear Language Display (CLD) 1U6
- Interprocessor Communication Bridge (IPCB) 1U7
IPC Diagnostics
Troubleshooting Modules Using IPC Diagnostics
- Figure 1 IPC Link Order For 70-125 Ton RTAA
- Figure 2 Module Fuse and Power Connection, Except CLD
- Figure 3 IPC Jumper For Bypassing Modules (to be inserted into MTA connector in place of module)
Troubleshooting Procedure
Temperature Sensor Checkout Procedure
Restart Inhibit Timer
- Figure 4 Variable Speed Fan (VSF) and Fan Staging Control
Outdoor Air Temperature and Fan Control
VSF Inverter Fault
CT and MCSP Compressor Current Input Checkout Procedure
Under-Over Voltage Transformer Checkout
Checkout Procedure for MCSP Load/Unload Outputs
Checkout Procedure for the Slide Valve and Load/ Unload Solenoids
- Setup
- Load
  - Figure 5 Manual Slide Valve Diagnostic Flow Chart - Load
- Unload
  - Figure 6 Manual Slide Valve Diagnostic Flow Chart
Checkout Procedure for MCSP Step Load Output
Checkout Procedure for Step Load Solenoid Valve and Piston
Power Supply
- Figure 7 AC Power Connection To Modules
Clear Language Display (CLD) 1U6 Keypad Overview
- Figure 8 Operator Interface Adaptive Control
- Select Report Group
- Select Settings Group
- Passwords
- Select Report Group and Select Settings Group Flowcharts
- Auto/Stop Keys
- Power Up
  - Figure 9 CLD Module (1U6)
- LEDs
Chiller Module (CPM) (1U1)
- Test Points
  - Figure 10 CPM (Chiller) Module (1U1)
- I/O terminals
Options Module (CSR) (1U2)
- Test Points
- Switch SW-1
- External Setpoint Inputs (4-20ma/2-10VDC)
- Setpoint Priority
  - Figure 11 Chilled Water Setpoint Arbitration
  - Figure 12 Current Limit Setpoint Arbitration
- ICS Communications
- I/O Terminals
  - Figure 13 CSR (Options) Module (IU2)
Electronic Expansion Valve Module (EXV) (1U3)
- Valve Operation
  - Figure 14 SEO 70, 100 Electronic Expansion Valve Cut Away View
  - Figure 15 SHEI Valve
- Electronic Expansion Valve Location
  - Figure 16 Electronic Expansion Valve Location
- Test Points
- EXV Test
- EXV Test Procedure
- Electrical Integrity Test
- Stroke Timing Test
- SEO EXV Valve Winding Resistance Check
- SEHI EXV Valve Winding Resistance Check
- Solder Techniques for Installation
- SEO Electronic Expansion Valve Servicing
  - Figure 17 Electronic Expansion Valve Soldering
  - Figure 18 SEO Electronic Expansion Valve Exploded View
- SEHI Electronic Expansion Valve Servicing
- I/0 terminals
Compressor Module (MCSP) (1U4 AND 1U5)
- Test Points
- IPC Address Switch SW1
- Current Gain (or Overload) Dip Switch SW2
- Binary Inputs
- Temperature Inputs
- Current Inputs
- Isolated Binary Input: Winding Temperature
- Relay Outputs
- Triac Outputs
- I/O Terminals
  - Figure 22 Compressor Module (MCSP) (1U4 and 1U5)
Interprocessor Communication Bridge Module (IPCB) (1U7)
- Figure 23 IPCB Nominal Terminal Voltages
LonTalk® Communications Interface - Chillers Module (LCI-C) (1U8)
- Figure 24 LCI-C Nominal Terminal Voltages
Inverter Diagnostics
Troubleshooting Procedure
- Figure 25 Variable Speed Fan Inverter
Service Pumpdown
- Service Pumpdown Procedure
- COMPRESSOR TEST
- Invoking Compressor Test
Circuit Lockout
- Invoking Circuit Lockout
Circuit Diagnostic Reset
- Invoking Circuit Diagnostic Reset

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