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How to Run A/C Without a Dual Fuel Circuit Board

Consisting of a heat pump and a separate furnace, dual fuel heating and cooling systems operate off both gas and electrical power. During periods of extremely cold weather the gas furnace supplies heat, but through periods of warmer weather the more economical heat pump circulates air across electric heating and cooling coils to both warm and cool the home. As the heat pump operates solely off electrical current, if you are not planning to use the gas furnace, the dual fuel circuit board can be replaced with a standard circuit board and thermostat.

Things You'll Need

  • Phillips screwdriver
  • Gas-line cap
  • Wrench
  • Single-stage thermostat
  • Single-stage circuit board
  • Electrical tape
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Instructions

    • 1

      Turn off the HVAC system power supply at the service panel. If the furnace is connected to a gas supply, turn off the gas supply valve to the furnace.

    • 2

      Remove the cover from the HVAC air handling unit with a Phillips screwdriver.

    • 3

      Disconnect the gas line from the furnace and attach a gas-line cap to the end of the gas line with a wrench.

    • 4

      Swap out the existing dual fuel circuit board and thermostat for a standard single-stage thermostat and circuit board. Locate the wires leading from the existing thermostat to the circuit board. Disconnect the color-coded power supply wires and terminal lead wires, one at a time, from the existing thermostat and connect the wires to the corresponding terminals on the new thermostat with a Phillips screwdriver. Repeat the process with the new circuit board, leaving the wires to the gas furnace disconnected. Tape the furnace wires together with electrical tape and tuck the wires behind the circuit board.

    • 5

      Return power to the system at the service panel. Turn the thermostat up or down, depending on room temperature, to start the system; recheck all connections if the system doesn’t activate.

    • 6

      Replace the cover on the air handling unit with the screwdriver.

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Next:

Air Conditioners
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  2. How to Bypass a Dual Fuel Circuit Board to Run the AC
  3. How to Replace an Air Conditioner Dual Run Capacitor
  4. How to Tell if an A/C Compressor Is Out
  5. How to Block A/C Noise
  6. How to Mount an A/C Brace
  7. How to Seal an A/C Case
  8. How to Solder A/C Lines
  9. How to Wire an A/C Fan
  10. How to Clean an A/C Filter
  11. How to Size an A/C Panel Board for a Substation
  12. How to Cool a Room Without A/C

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