AFE18-60A All Fuel System Control Board for Standard or Dual Fuel Use. When installing the communicating capable furnace with a heat pump, the preferred installation would include a communicating thermostat. A communicating thermostat provides control of gas heat and heat pump operation and eliminates the need for a separate dual fuel control. A legacy dual fuel thermostat could also be used with 24 volt wiring to control the gas furnace and heat pump. If a communicating thermostat or legacy dua
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