Trane RTAA 70-125 TON - Manual

Trane RTAA 70-125 TON

Trane RTAA 70-125 TON – Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.

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Table of Contents:

  • Page 3 – Contents
  • Page 4 – General Information; Service Philosophy; Table 1
  • Page 5 – System Description; Description
  • Page 7 – Overview on page 42; Interprocessor Communication Bridge (IPCB) 1U7
  • Page 8 – Interprocessor Communications; IPC Diagnostics; identify which module was to have sent the missing information.
  • Page 9 – Interprocessor Communication; Troubleshooting Modules Using IPC Diagnostics; WARNING; Table 2
  • Page 10 – Figure 1
  • Page 11 – Loss of power to a module:
  • Page 12 – Improper connections to terminal J2:; Troubleshooting Procedure; Figure 3
  • Page 14 – If the CLD Comm link to the CPM is broken, the message is:
  • Page 15 – Temperature Sensor Checkout; Temperature Sensor Checkout Procedure; Always use a digital volt-ohmmeter with 10 megohm or greater input
  • Page 16 – “Module Power and Miscellaneous I/O” starting on page 41
  • Page 17 – Table 3
  • Page 18 – Table 4
  • Page 19 – Compressor Operation; Restart Inhibit Timer
  • Page 20 – Compressor Start/Stop; After the EXV is positioned:
  • Page 23 – Current Transformer; thru
  • Page 25 – Table 5
  • Page 26 – Refer to
  • Page 30 – Table 8
  • Page 31 – Table 9
  • Page 32 – Under-Over Voltage Transformer; Under-Over Voltage Transformer Checkout
  • Page 34 – Compressor Capacity
  • Page 35 – Checkout Procedure for MCSP Load/Unload Outputs
  • Page 36 – Setup
  • Page 37 – Enabling the “Compressor Test” only affects which compressor will; Load; Loading the compressor faster than this rate could cause control
  • Page 38 – Unload; Install toggle switches across load and unload solenoid; Figure 5
  • Page 39 – Check coil; Checkout Procedure for MCSP Step Load Output; Figure 6
  • Page 41 – Module Power and Miscellaneous I/O; Power Supply; Figure 7
  • Page 42 – Clear Language Display (CLD) 1U6 Keypad Overview; Figure 8
  • Page 43 – Select Report Group; - Refrigerant Report
  • Page 44 – Select Settings Group
  • Page 45 – Power Up
  • Page 46 – REQUESTED SETPOINT SOURCE:; LEDs; There are four LEDs located to the right of TB1 of the CLD module. See; IPC Communications
  • Page 47 – Test Points; Don't use the aluminum module enclosure as a reference as it has
  • Page 48 – Figure
  • Page 50 – to be used with a current or voltage source that:
  • Page 51 – Has its negative terminal tied to chassis ground.
  • Page 52 – Setpoint Priority; Input Values vs. External Current Limit Setpoint
  • Page 53 – Chilled Water Setpoint Arbitration
  • Page 54 – Current Limit Setpoint Arbitration
  • Page 55 – ICS Communications; for a
  • Page 56 – CSR Normal Terminal Voltages for Options Module 1U2
  • Page 58 – Valve Operation; For units with remote evaporator use 16 AWG wire.
  • Page 59 – SEO 70, 100 Electronic Expansion Valve Cut Away View
  • Page 60 – Electronic Expansion Valve Location; . This will prevent oil
  • Page 61 – Place the Chiller in the “STOP” mode using the Stop Button on the CLD.; Electrical Integrity Test
  • Page 62 – Stroke Timing Test; The loudness of the clicking varies from one valve to another and; SEO EXV Valve Winding Resistance Check
  • Page 63 – SEHI EXV Valve Winding Resistance Check; Table; Solder Techniques for Installation; Test Results Logic Table
  • Page 64 – SEO Electronic Expansion Valve Servicing; Electronic Expansion Valve Soldering
  • Page 65 – Disconnect all the line voltage to the power supply of this unit.; CAUTION
  • Page 66 – between the motor cap and motor housing
  • Page 67 – SEHI Electronic Expansion Valve Servicing
  • Page 68 – SEHI Electronic Expansion Valve Exploded View; IGHTGLASS
  • Page 69 – SEO Valve Module
  • Page 70 – and the Chiller Wiring Diagrams for both high and low voltage
  • Page 71 – EXV Module Normal Terminal Voltages
  • Page 72 – Current Gain (or Overload) Dip Switch SW2; for each compressor. Switch position SW2-1 is the
  • Page 73 – Binary Inputs; If the MCSP gain switch and CPM gain setting do not agree, a
  • Page 74 – Isolated Binary Input: Winding Temperature
  • Page 76 – Compressor Module Normal Terminal Voltages (1 U4 and 1 U5)
  • Page 78 – It prevents “crashes” of the IPC and UCM if the link to
  • Page 79 – Note: LonTalk® communication links are not polarity sensitive.
  • Page 80 – Variable Speed Fan System; Inverter Diagnostics; The Inverter has two LED’s for diagnostic purposes. They are:
  • Page 83 – The output from the compressor module is a pulse width modulated
  • Page 85 – Other Service Features; Service Pumpdown; Service Pumpdown Procedure; The unload solenoid is always kept energized for approximately 1
  • Page 86 – COMPRESSOR TEST
  • Page 87 – Circuit Lockout; Invoking Circuit Lockout; Circuit Diagnostic Reset; Invoking Circuit Diagnostic Reset
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August 2005

RLC-SVD03A-EN

© American Standard Inc. 2005

Model

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

Diagnostic
Troubleshooting
Repair

Series R

®

70-125 Ton Air-Cooled and Water-Cooled
Rotary Liquid Chillers

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Summary

Page 3 - Contents

RLC-SVD03A-EN 3 Contents General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Service Philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4System Description . . . . . . . . . . . . . . . . . . . ...

Page 4 - General Information; Service Philosophy; Table 1

4 RLC-SVD03A-EN General Information The Unit Control Modules (UCMs) described in this troubleshooting guide provide a microprocessor based refrigeration control system, intended for use with Trane 70-125 ton helical rotor chillers. Six types of modules are used, and throughout this publication will ...

Page 5 - System Description; Description

RLC-SVD03A-EN 5 General Information System Description The CPM is the master module and coordinates operation of the entire system. One is used per chiller. The MCSP is a compressor protection module with one being used for each of the compressors in the chiller. The EXV is the expansion valve contr...

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