Introduction; Reliatel Introduction; Why Change - Trane ReliaTel Diagnostic Manual

Introduction

3 to 10 ton Convertible and 12½ to 50 ton Dedicated Packaged Rooftops
3 to 10 ton cooling only and gas electric convertible packaged units can be built with either
electromechanical or ReliaTel™ controls. 12½ to 50 ton units are built with ReliaTel controls only.
All Heat pumps are built exclusively with ReliaTel controls. This publication covers both
electromechanical and ReliaTel controls. Due to the more complex application and service
opportunities, greater emphasis is placed on units with ReliaTel controls.
This publication does not cover all aspects of service. It assumes that the service person is an
experienced commercial service technician with a strong background in electrical controls and DC
circuits. If you are not experienced and fully qualified in HVAC service, do not attempt to use this
manual to service equipment. Doing so could cause personal injury to yourself or others and could
result in expensive equipment or property damage.

ReliaTel Introduction

ReliaTel is not the name of a circuit board, but rather an overall communicating control system
consisting of up to eight communicating modules.
ReliaTel is the name given to the second generation microprocessor controls developed by Trane.
ReliaTel controls were first used in the 3-10 ton convertible packaged cooling with electric heat, gas
electric, and heat pumps. ReliaTel has been added to other commercial products as well. In April
2003, 12½-25 ton dedicated units were converted to ReliaTel controls. In April 2004, ReliaTel
controls were added to 27½ to 50 ton dedicated units

Why change?

The Micro has proven itself to our customers in thousands of applications around the world. A
microprocessor based unit provides superior comfort, unmatched reliability and much greater
flexibility than conventional systems. ReliaTel has even more flexibility, is more compact, has
additional system reliability enhancements and more.
Much of what ReliaTel does will be very familiar to service technicians accustomed to the previous
generation Micro. Testing and troubleshooting is similar, and in many cases the same. There are,
however, some significant differences, so it is important that the service person use the correct
material for the unit being serviced.
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