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Thread: I lectric heat.

  1. #1
    Join Date
    Oct 2016
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    I lectric heat.

    Why would an electric duct heater need a 24v relay on incoming control voltage? Had 23v to relay but didn't energize contractor.

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  2. #2
    Join Date
    Apr 2010
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    Don't know for sure without a model number, but that's a common way to ensure that the heater doesn't come on without the fan signal.

    There's two common ways, an actual airflow switch in the heater, which won't turn on the heat unless air is actually moving through, and then the kind where the heating call is routed through a relay that's controlled by the fan signal. That sounds like what you got. The drawback to this approach is that it only keeps the heat from coming on without a call for fan, doesn't help with something like a broken belt or severely clogged filters.

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