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    Sammy T's Avatar
    Sammy T Posts: 1, Reputation: 1
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    #1

    Dec 20, 2009, 07:08 AM
    20va replaced with 40va
    I have a furnace with a 20 va transformer can I replace it with a 40 va?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Dec 20, 2009, 07:34 AM
    Sure.

    VA is volt-amperes, which is nothing more than AC power or watts.

    The control circuit will have a certain load in VA, which is mostly the load of the relay coils. Also can be pilot lights, etc.

    What is often often forgotten, is relay coils will have a steady VA once they are energized and in place, but the initial start of a relay coil is called "in rush" amps or VA. This happens quickly, (inverse time) or load reduces as time passes. This in rush load can tax a transformer if not sized properly.

    In this case, bigger is better.
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