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MODINE CONTROLS SYSTEM MANUAL
ClassMate and SchoolMate Models
AIR74-525.1
Main Unit controller Inputs/Outputs (continued)
The inputs and outputs of the controller are listed below. Note that some items are optional and may not be installed on all
models.
pCOOEM+ Input and Output Terminals
I/O Type Output # Voltage Description Notes Standard
Model Nomenclature Digit Or
Optional
Digital Output
NO1 - C1 NO Relay
Supply Fan Motor Control
High Speed
Closed when Supply fan
High is enabled
NC1 - C1 NC Relay
Supply Fan Motor Control
Low Speed
Normally Closed while
running
NO6 - C6 NO Relay Supply Fan Enable Enable Supply Fan
NO7 - C7 NO Relay Electric Heating 1 Enable Electric heat 1 Digit 15,16= 02-20
NO8 - C8 NO Relay Electric Heating 2 Enable Electric heat 2 Digit 15,16= 10-20
NO9 - C9 NO Relay Outside Air Damper
Air damper opens when
enabled
Digit 9= B,C,D,E,G,H,J,K,M,N,P
NC9 - C9 NC Relay Not used Not used
NO10 - C10 NO Relay Exhaust Fan Enables Exhaust Fan Digit 3=S,G,W
NC10 - C10 NC Relay Not used Not used
NO11 - C11
NO Relay High
Voltage (230 Vac)
ERV Wheel
Turns wheel when
closed
Digit 9=C,D,E,H,J,K,N,P
NO12 - C11
ERV Exhaust Ventilation
Fan
Enable fan when closed Digit 9=C,D,E,H,J,K,N,P
NO13 - C11
ERV Supply Ventilation
Fan
Enable fan when closed Digit 9=C,D,E,H,J,K,N,P
Out 2 - C2 24V Relay Hot Gas Reheat Valve Available on base units Digit 14= A
Out 3 - C2 24V Relay Reversing Valve
Heatpump Units or
Schoolmate
Closed during Cooling,
Open during Heatpump
Digit 1,2,3= CMP,SMG,SMW
Out 4 - C2 24V Relay
Compressor And/or
Coaxial Coil Valve
Controls Compressor on
all units, as well as
The Coaxial Coil Only
On Schoolmate Units
Out 5 - C2 24V Relay Capacity Control Solenoid
Closed When
compressor in high
stage/stage 2
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