Systems Controls & Instruments CEM-24 Series Owner's Manual page 7

3.3 Connections of heat outputs
The CEM-24 thermostat has can be connected to three types of heating systems:
Connection to 24VAC Heat Pump system
JP1 on base plate must be moved to "3" position and JP6 on the front plate must be short (HP).
Connection to 24VAC Heat Element
JP1 on base plate must be moved to "3" position and JP6 on the front plate must be open (HC).
Connection to 2-wire Millivolt system (dry contact)
Note: Connection to 2-wire Millivolt system is
JP1 on base plate must be moved to "1" position and JP6 on the front plate must be open (HC).
used
only in HC configuration!
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