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16−Compressor 2 Control Module A57
The compressor 2 control module A57 controls one addi-
tional compressor stage for the SCA/SCB units. A57 in-
cludes all inputs and outputs required for compressor and
fan control, compressor stages diagnostics, and low ambi-
ent control.
17−Compressor 3 & 4 Control Module A59
The compressor 3 & 4 control module A59 controls two addi-
tional compressor stage for the SCA/SCB units. A59 includes
all inputs and outputs required for compressor and fan control,
compressor stage diagnostics, and low ambient control.
18−Electric Heat Control Module A60
( 45 − 90 kW electric heat)
The electric heat control module A60 is used to control a
second electric heat bank.
19−Economizer Control Module A56
(Economizer only)
The economizer control module A56 controls the econo-
mizer. A56 has four different cooling modes, sensible
temperature, outdoor enthalpy, differential enthalpy, and
global control.
IMC BOARD INPUTS AND OUTPUTS
SCA120
P110
P111
P112
P113
P115
P116
SENSORS
INPUTS
OUTPUTS
COMPRESSOR
SAFETY INPUTS
BURNER
INPUTS
ROOM
THERMOSTAT
(A2)
A55
A56
A57
TB1 CONNECTS TO P110. ROOM THERMOSTAT CON-
NECTS TO TB1.
A55:
A56:
OPTIONAL
ECONOMIZ-
ER AND/OR
POWER EX-
HAUST FAN
A57
SECOND
COMPRESSOR
1 OUTDOOR FAN
1 BLOWER
1 COMPRESSOR
1 GAS VALVE
1 OUTDOOR FAN
IMC AND ADD−ON BOARD LOCATION AND OPERATION
FIGURE 6
P114
A67
OPTIONAL
REHEAT CON-
TROL
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