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    Tudor Man's Avatar
    Tudor Man Posts: 4, Reputation: 1
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    #1

    Mar 22, 2013, 05:54 AM
    Low voltage wiring for janitrol
    I found a furnace that had the common on the transformer grounded to the cabinet?and the common of the contractor for ac there also ?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Mar 22, 2013, 06:19 AM
    I would isolate from ground, the relays and contactors need the 24 volts with no connection to ground.
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    Tudor Man Posts: 4, Reputation: 1
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    #3

    Mar 22, 2013, 06:54 AM
    Crazy ? I disconnected it and connected the common to the ac and disconnected additional common from transformer that was connected to ground also and it wouldn't run on heat. I know what your saying as for the common and leg of power . That's why I'm confused.
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    Stratmando Posts: 11,188, Reputation: 508
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    #4

    Mar 22, 2013, 07:14 AM
    Your Heat, Compressor, and Blower Contactors/Relays have 1 side of the transformer connected, they get the other side of the 24 volts from the thermostat. You will need to use a unused wire, or use an additional wire.
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    Tudor Man Posts: 4, Reputation: 1
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    #5

    Mar 22, 2013, 07:33 AM
    Quote Originally Posted by Stratmando View Post
    Your Heat, Compressor, and Blower Contactors/Relays have 1 side of the transformer connected, they get the other side of the 24 volts from the thermostat. You will need to use a unused wire, or use an additional wire.
    Yes. But I don't know why the grounded the common.
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    Tudor Man Posts: 4, Reputation: 1
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    #6

    Mar 22, 2013, 08:07 AM
    Yes. But I don't know why the grounded the common.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #7

    Mar 23, 2013, 06:22 AM
    They may have cheated? Not having the extra wire and were lazy, they used the ground, it would work, they may even have done it in the old days.
    It is potentially dangerous as a problem could cause your low voltage and thermostat wiring to be Line Voltage Levels.
    Find where the relay/contactor for heat connects to ground, and connect to your new wire.
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