Trane RTHD Troubleshoot Manual

Service Alert
RTHD and RTAC
Control Operation, Setup and
Troubleshooting for RTAC and RTHD Units
with Tracer CH530 Controls
The purpose of this bulletin is to provide control operation and general
troubleshooting information on the RTAC Air Cooled Chillers and RTHD Water
Cooled Chillers with the CH530 controls. It is recommended that the service
technician be familiar with the CH530 operation prior to servicing the
microprocessor.
This bulletin is intended to serve as a supplement to the RTAC and RTHD IOMs,
the installation, operation and maintenance manuel. Subjects covered in this
bulletin are intended to provide more comprehensive information for the RTAC
and RTHD units.
Diagnostic
Troubleshooting
Repair
November 2005 RLC-SVD05A-EN

Trane RTHD Specifications

General

Type	Water-Cooled Chiller
Refrigerant	R-134a
Compressor Type	Helical Rotary (Screw)
Voltage Options	200, 230, 380, 460, 575
Capacity Range	200 - 4000 tons (703 kW - 14, 060 kW)

Summary

RTHD and RTAC Control Operation, Setup and Troubleshooting with Tracer CH530 Controls

Document Overview and Purpose

Provides control operation and troubleshooting for RTAC/RTHD units with CH530 controls.

Warnings and Cautions

Essential Safety and Environmental Guidelines

Covers critical safety warnings, environmental concerns, and refrigerant handling practices.

CH530 System Overview

CH530 Architecture and Key Components

Explains the distributed architecture, main processor, starter module, power supply, and LLIDs.

IPC Overview and Troubleshooting

LLID Installation and Troubleshooting Procedures

Details installation, binding, and troubleshooting of LLIDs on the IPC bus.

Power Supply Module

Power Supply Troubleshooting and Specifications

Covers troubleshooting procedures and voltage specifications for the power supply module.

Temperature Sensor

Temperature Sensor Checkout and Accuracy Testing

Details how to check temperature sensor binding, communication, and reading accuracy.

Pressure Transducers

Pressure Transducer Checkout and Accuracy Testing

Details how to check pressure transducer binding, communication, and reading accuracy.

Variable Speed Fan Control - RTAC

Inverter Faults and Troubleshooting Guide

Explains inverter fault indications and troubleshooting procedures for variable speed fans.

Current Transformers

CT and Compressor Current Input Checkout Procedure

Outlines how to check current transformer inputs for compressor monitoring and protection.

Over/Under Voltage Protection

RTAC and RTHD Voltage Checkout Procedures

Details procedures for checking over/under voltage protection on RTAC and RTHD units.

Starter Module Operation

Y-Delta and Solid State Starter Sequences

Explains the operation and sequences for Y-Delta and Solid State starters.

Compressor Capacity Control - RTHD

Load and Unload Solenoid Valve Checkout Procedures

Procedures for checking load and unload solenoid valve operation for compressor capacity.

Compressor Capacity Control - RTAC

Step Load and Load/Unload Solenoid Valve Checkout Procedures

Procedures for checking step load and load/unload solenoid valve operation for compressor capacity.

Electronic Expansion Valve (EXV)

EXV Checkout and Functionality Testing

Details EXV checkout, testing for proper function and communication.

Liquid Level Sensor

Liquid Level Sensor Checkout and Accuracy Testing

Procedures for checking liquid level sensor binding, communication, and reading accuracy.

Gas Pump - RTHD Only

Gas Pump Checkout Procedures (Unit Off and On)

Outlines procedures to check gas pump operation when the unit is off and when it is on.

Optical Sensor - RTHD Only

Optical Sensor Checkout Procedure

Details the checkout procedure for the optical oil level sensor.

TechView Service Tool

Software, Hardware, and Installation Guide

Lists requirements and guides for downloading/installing TechView software and hardware.

Using TechView for Operations and Updates

Explains unit monitoring, diagnostics, software updates, and device binding using TechView.

Configuration and Binding Procedures

Details modifying chiller configuration and the device binding process with symbols.