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How to Wire Fireplace Inserts with Heat Sensors

Electrical Wiring and Operation of Fireplace Insert Blower Fans: The temp sensor needs to have time to cool down in order to turn off the fan. Now, the fan blower will not go off when unit cools down. If I turn the variable-speed switch off and back on it will still the start fan motor.


The Wiring and Operation of Fireplace Insert Blower Fans

Electrical Question: I have a fireplace insert that was installed.

  • I installed the electrical wiring for the following
    • A fan
    • Heat sensor
    • Variable-speed switch
  • I ran the neutral wire
    • From wall
    • Up to one leg of motor
  • I took the hot side of the power source
    • Ran it to one side of variable-speed switch
    • And the other side of variable-speed switch went to a heat sensor
    • And the other side of heat sensor to fan motor
  • When I first plugged unit in
    • I turned up the fan speed
    • The fan did not go on
  • I lit the heater and
    • After a few minutes the fan kicked in (as planned)
  • Now, the fan blower will not go off when unit cools down.
    • If I turn the variable-speed switch off and back on it will still the start fan motor.
  • But if I unplug it from wall outlet,
    • The fan will not go back on until unit is hot
      • and then we repeat same problem again

This electrical wiring question came from: Mike, a Homeowner from Coopersburg, PA. USA
Additional Comments: Great!

Dave’s Reply:
Thanks for your electrical wiring question Mike.

Electrical Wiring and Operation of Fireplace Insert Blower Fans

  • The temp sensor needs to have time to cool down in order to turn off the fan.
  • This sounds like you may have a bad temp switch if it takes this long to turn off the fan blower motor.
  • I would contact the manufacturer and explain the situation and see if they will send a replacement heat sensor.

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2 Responses to “How to Wire Fireplace Inserts with Heat Sensors”
  1. Walt says:

    Mike, hello. I suspect you solved your dilemma, by now. But, I thought I would toss in my 2 cents. The motor, if it is a standard AC/DC 120V. motor, may have a specific required start up voltage. At lower speeds, the control may not supply the proper voltage required. Not all motors are the same, but, a speed control may eventually kill a motor, if it is not designed for it. More expensive speed controllers are available, but they may not be the most efficient. Changing a pulley/ sprocket is more involved, but works great.

    • Dave Rongey says:

      Hi Walt,
      You are absolutely right, and I appreciate your input. I agree that not all motors are alike and special attention should be given to the specifications that the motor manufacturer provides for best results.
      Dave

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