Overview
RTHC-SVD01B-EN 1
Section 1 Overview
1-1. General
The Unit Control Modules (UCMs) described in this troubleshooting
guide provide a microprocessor based refrigeration control system,
intended for use on the RTHC units. The table below describes the
various modules used.
1-2. Service Philosophy
The intent of the troubleshooting bulletin is to determine which module
is potentially at fault and then to confirm a module problem. This is
done either through voltage or resistance measurements at the sus-
pected input or output terminals, or by checking related wiring and
external control devices in a process of elimination. Once a problem
has been traced to a module, the module can easily be replaced using
only basic tools. In general, all dip switch settings of the replaced mod-
ules should be copied onto the replacement module‘s dip switches
before applying control voltage. Replacement of the 1U1 is more
involved due to the numerous configuration and set-up items that need
to be reprogrammed into UCP2.
Table 1-1: Unit Control Module Designations
Line Drawing
Designator
Controller Name
1U1 UCM Chiller Module
1U2 UCM Starter Module
1U3 UCM Stepper Module
1U4 Clear Language Display
1U5 UCM Options Module (optional)
1U6 TCI-IV Comm 4 (optional- Tracer Summit) or
Comm 3 (optional - Tracer interface)
1U7 Printer Interface (optional)
4U1 Adder Subtractor Module for Optional
Condenser Water Regulating Valve
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