Hrv / Erv Ventilator Operation; Heat Pump Loop Valve Operation - Tekmar Invita Installation, Operation And Maintenance Manual

HRV / ERV Ventilator Operation

Ventilation with fresh outdoor air is important for maintaining indoor air quality . The thermostat can
operate a heat recovery ventilator (HRV) or energy recovery ventilator (ERV) on a timer by closing the
Accessory 1 relay to operate the ventilator fan at low speed .

Heat Pump Loop Valve Operation

The thermostat supports water-to-air heat pump systems that absorb or reject heat to a hydronic
building loop . Whenever the heat pump compressor Y1 or Y2 relay is turned on, the Accessory 1 relay
closes to open a hydronic zone valve . This allows variable speed pumps on the hydronic loop to oper-
ate at lower speeds when the heat pump is off, thereby saving electrical energy .
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