Operating instructions

IMM AGSB-60 51
Control Panel
The control panel for Circuit #1 is shown below. The panel for circuit #2 and #3 is similar but does
not contain the Unit Controller.
Distributed control architecture enhances unit reliability. Each compressor circuit has its own
microprocessor controller so that if one controller is inoperative, the other compressor(s) will be
allowed to run.
T4, Load/
Unload Solenoid
Transforme
r
T3, Control
Transformer
T5, Exp. Valve
Transforme
r
T2, Control
Transformer
EWHR, Evaporator
Heater Relay
MHPR, Mech. High
Pressure Relay
Circuit Breakers
Solid State Starter
Displa
y
Expansion Valve
Board
Unit Controller,
Located in Circuit #1
Panel Only
Circuit Controller
Unit Switc
h
Circuit Switch
TB1, Field Control
Connections,
(Terminal Numbers
on Top or Bottom)