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MODINE CONTROLS SYSTEM MANUAL
ClassMate and SchoolMate Models
AIR74-525.1
Standard and Optional Sensors Monitored
The Modine Controls System monitors a number of sensors within the ClassMate and SchoolMate units as follows:
Standard sensors monitored:
● Supply Air Temperature (Unit Mounted)
◦ Used to monitor supply air temperature; supply air
limit control
● Return Air Temperature (Unit Mounted)
◦ Used to monitor space temperature
● Indoor Coil Temperature (Unit Mounted)
◦ Used as a limit on the indoor coil to prevent frost
buildup
● Outside Air Temperature (Unit Mounted)
◦ Used in Econ Control, Hot Water Control and Com-
pressor Lockout
● Compressor High Pressure Switch (Unit Mounted)
◦ With retry control
● Compressor Low Pressure Switch (Unit Mounted)
◦ With retry control
● Geo Water Out (Unit Mounted On Schoolmate Units
only)
◦ Displays the liquid temperature while leaving the
unit
● Outside Coil Temperature (Unit Mounted)
◦ Used for defrost control
Optional sensors available:
● CO2 Sensor (Unit Mounted)
◦ Measures Return Air CO2 level for ventilation
● Outside Temperature and Outside Humidity
◦ Used to calculate OA enthalpy and dew point
● pAD Space Temperature and Humidity (Field In-
stalled or Unit Mounted)
◦ Used for space temperature and humidity control
● Liquid Line Pressure (Unit Mounted)
◦ Used for head pressure control for dehumidifi ca-
tion
● Dirty Filter Switch (Unit Mounted)
◦ Used to monitor pressure drop through the fi lter
● Condensate Float Switch High Level Alarm (Unit
Mounted)
◦ Disables the compressors if the drain pan is not
draining properly
● Mechanical Temperature only Thermostat (Field
installed or Unit Mounted)
◦ Slight manual adjustment of temperature set-
points
● Freeze Thermostat (Unit Mounted)
◦ Coil Freeze protection
● Occupancy Sensor (Field Installed or Unit Mounted)
◦ Infrared motion detector
● Current Switch (Unit Mounted)
◦ Verifi es component is functioning
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