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    justryn's Avatar
    justryn Posts: 3, Reputation: 1
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    #1

    Jul 17, 2010, 05:11 AM
    How to wire a second thermostat to control hvac blower
    I am thinking of installing an outdoor wood furnace for home heat. How could I wire a second thermostat to control the existing blower motor without energizing the hvac compressor ? Thanks for any help.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Jul 17, 2010, 05:29 AM

    A double pole/double throw contactor could open compressor control wiring when heat is energized.
    justryn's Avatar
    justryn Posts: 3, Reputation: 1
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    #3

    Jul 17, 2010, 05:59 AM
    Quote Originally Posted by Stratmando View Post
    A double pole/double throw contactor could open compressor control wiring when heat is energized.
    Sir, Thank you for the reply. I'm not shure I understand, are you suggesting using a contactor that would open or break the circuit going to the hvac- when the second thermostat drops to its lower setting and, then reverses to complete the hvac circuit when the 2nd thermostat reaches the perfered high heat setting? Also would a relay be needed to power the contactor?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #4

    Jul 17, 2010, 06:10 AM

    It would break the circuit to the compressor,
    Whenever the Heat is call for.
    You could use the 24 volts from the transformer already there.
    Can you provide a basic diagram, or describe your wood furnace control? Thanks
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