Inputs:
Aquastat - In 50 gal buffer tank. (24VAC)
House Thermostat - on wall somewhere in living space (24VAC)
Outputs:
HP -Heat pump turn on heat pump (24VAC into thermostat connection in heat pump)
-On if Aquatat <OR> Thermostat
Pump for Heat Pump - turn on any time heat pump is on. Often the heat pump will have a switched 120VAC line for that.
Floor valve - valve to floor loop - 24vac to actuate
-If Thermostat <AND> NOT Aquastat
Tank Valve - Valve to 50 gal buffer tank
HEAT EXCHANGER LOOP
-Differential temperature controller between water heater and buffer tank turns on the pump whenever buffer tank is more than a few degrees warmer than the water heater.
Consequently underfloor heating and heat pumps are perfect partners as they are both well suited to the low temperatures involved in maximizing efficiency.
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