Trane RTHB User Manual

Solid State Starter Conversion
RTHA, RTHB, RTHC, RTHD
Installation, Operation, and Maintenance
April 2020
RLC-SVN005B-EN
RTHA 50/60 hz units RTHB 50/60 hz units
RTHC 50/60 hz units RTHC 50/60 hz units
This manual covers both Benshaw MX and MX2 solid state starters
MX starter used for units manufactured until November 2010
MX2 starter used in units manufactured December 2010 and later
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are
attached to the equipment.

Trane RTHB Specifications

General

Model	RTHB
Refrigerant	R-134a
Category	Chiller
Efficiency	High
Dimensions	Varies by model

Summary

General Information and Starter Identification

Removal of Existing Starter

Provides instructions for removing the old starter unit.

Installation of Benshaw Starter

Details the steps for installing the new Benshaw starter.

Circuit Breaker and Shunt Trip Requirements

Outlines requirements for circuit breakers and shunt trips.

Wiring Procedures

Low Voltage Wiring

Instructions for interconnecting wiring between controls and starter.

High Voltage Wiring

Instructions for wiring the high voltage/power supply to the compressor.

RTHA Units with Wye-Delta Starters

Removal of Existing Wye-Delta Starter

Steps to remove the existing Wye-Delta starter.

Installation of Benshaw Starter for RTHA

Steps for installing the Benshaw starter in RTHA units.

RTHA Wiring Instructions

RTHB Units with A515 (or Wye-Delta) Starters

Removal of Existing A515 Starter

Steps to remove the existing A515 starter.

Installation of Benshaw Starter for RTHB

Steps for installing the Benshaw starter in RTHB units.

RTHB Wiring Instructions

RTHC Units with EasySTART (or Wye-Delta) Starter

Removal of Existing EasySTART Starter

Steps to remove the existing EasySTART starter.

Installation of Benshaw Starter for RTHC EasySTART

Steps for installing the Benshaw starter in RTHC EasySTART units.

RTHC EasySTART Wiring Instructions

RTHC Units with IT (or Wye-Delta) Starter

Installation of Benshaw Starter for RTHC IT

Steps for installing the Benshaw starter in RTHC IT units.

RTHC IT Wiring Instructions

RTHD Units with IT Starter

Removal of Existing IT Starter

Steps to remove the existing IT starter.

Installation of Benshaw Starter for RTHD IT

Steps for installing the Benshaw starter in RTHD IT units.

RTHD Wiring Instructions

Quick Start and Initial Parameters

Prior to Unit Power Up Checks

Critical checks before powering up the unit.

Programming UCP2 or CH530 Controller

Programming the Benshaw Starter

Steps to program the Benshaw solid state starter parameters.

Parameter P1 Motor FLA

Parameter P2 Maximum Motor Current

Parameter P3 Ramp Time

Parameter P5 CT Ratio

Matches CT ratio to starter's current transformers.

Parameter P8 Fault Log

Current Transformer Set-up (MX Only)

Guides setting up current transformers for MX starters.

CT Polarity (MX and MX2)

Details proper CT polarity for accurate measurements.

Troubleshooting Common Issues

Troubleshooting Chart

Lists common problems and their possible causes.