Duration : 495 sec. | Views : 454 | Likes : 10 | Comment : 5
If natural gas is available, don't bother with this hybrid. This is just a good alternative when Propane is available. Natural gas is less expensive to run that a heat pump. This Hybrid system runs like a standard electric only heat pump with AUX heat. However, to prevent high head pressure on the heat pump, the compressor is locked out immediately when the heat energizes (W wire). The compressor stays locked out when the supply air entering the evaporator coil reaches 105 deg F. The compressor will turn back on when the entering evaporator air drops below 90 deg F. This allows the furnace to cool down before the heat pump is energized. 1) The thermostat always runs the heat pump as priority. The Propane heat is only run in Emergency Heat mode, or when below set point. 2) The W from the heat pump must be left unconnected. 3) Relay ?R? fits inside the Ranco thermostat control. It is a 24VAC SPDT fan relay part number 90293Q 4) Ranco Thermostat is part number ETC112000 (24 VAC) 5) Ranco setup is 90 deg, 15 differential, C1 for Cooling.
