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    4robert6's Avatar
    4robert6 Posts: 6, Reputation: 1
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    #1

    May 27, 2009, 03:38 PM
    Furnace transformers
    I have been looking at a electrical blurprint for a heating and air conditioning unit. Power coming in the transformer is 120v and neutral. On the secondary side is power going out (24V) hot on each wire in which there is only two?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    May 27, 2009, 03:39 PM

    What are you wanting to do? The secondary will have 28 volts between the two wires. A common and a hot.
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    4robert6 Posts: 6, Reputation: 1
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    #3

    May 27, 2009, 03:49 PM
    I am trying to read an old blue print about 25 years old as much as the ac and heating units. The secondary side shows voltage going to the thermostat and to the other circuitry.
    I needed to know if the theromstat is energized at the same time as the relays.
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    Joshdta Posts: 2,549, Reputation: 45
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    #4

    May 27, 2009, 03:53 PM

    Yes the red wire to the t-stat should get power as soon as the unit is turned on.
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