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  1. #1
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    Aug 2014
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    where is the 24v input at the simplicity 1a board?

    hello, is anyone has a simplicity 1a board manual? where is the 24v input locate at the simplicity 1a board? thanks!

  2. #2
    Join Date
    Nov 2006
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    Maybe ther is such a manualk, but I have never seen it.

    I just look at the dorr sticker on the unit.

    I believe there are two 24volt inputs to the board. One runs the logic and is sent out on the R wire to the thermostat, and the other is the power buss to the relay outputs along the bottom of the simplicity board, when the stat connections are at the left.
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  3. #3
    Join Date
    Aug 2014
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    Los Angeles
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    Thread Starter
    Quote Originally Posted by timebuilder View Post
    Maybe ther is such a manualk, but I have never seen it.

    I just look at the dorr sticker on the unit.

    I believe there are two 24volt inputs to the board. One runs the logic and is sent out on the R wire to the thermostat, and the other is the power buss to the relay outputs along the bottom of the simplicity board, when the stat connections are at the left.
    Thank you for your reply! I agree with you about two 24 volt circuits. One 24v circuit is sent out on the R wire to the thermostat, then back to the logic. Another runs in those contactors, like C1, C2, Fan, Cn-fan. one 24 v power source with two 24v circuits.

    i service a York package AC on the roof. i found only one transformer there, only one 24v hot line and one neutron line after the transformer are connected to downstairs with some device, and i also found the thermostat connect with the simplicity 1a board use another cable. i just wondering the board need 24v to work, but it must not get the power from second one, must get the power from first cable down there. I check with the board, the 24v input may locate at the upper left corner— R(hot), C(neutron)? (a relay alone there)

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