Part #101ASSB (shown) for Gas/Electric units

Part #101AACBHP for Heat Pumps (larger heat pumps may use gas/electric inputs. They require a gas/electric 101ASSB controller).

The controller is capable of controlling from two to twenty-five individual modulating zones. The System Controller communicates with the Zone Thermostats via a patented Five-Wire Link. The Five-Wire Link is daisy chained from thermostat to thermostat using standard five-conductor thermostat wire. The System Controller polls every zone and registers the number of thermostats calling for heating and cooling. The System Controller then runs the HVAC unit in the mode with the most calls. If the majority changes, the System Controller will automatically change over to the new mode of operation.

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