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  1. #1
    Join Date
    Sep 2003
    Location
    Western PA
    Posts
    1,339

    York relay board

    So I thought i had an intermittent problem with the relay board on a York RTU. Ordered a board and went back yesterday. The unit was operating when I got there. figured I would change the board and save the original as an emergency spare. After swapping the boards guess what. No damn cooling. I had to put the old board back in. It was the end of the day and they were going home. I'll attach a copy of the wiring diagram. Could someone shed some light on the sequence of operations of this unit.
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  2. #2
    Join Date
    Oct 2012
    Location
    Wisconsin
    Posts
    2,668
    Did either stage run?

    Basically, the board has some lockout relays on it. If anything in the safety circuit (low pressure, high pressure, freezestat) opens, the board will lock out that stage, until the unit is powered off and back on, or thermostat quits calling for that stage.

    The board has terminals A1 and A2, they need to be jumpered together or wired through the thermostat, in order for the Occupied Relay to close, otherwise neither stage of cooling will run.

  3. #3
    Join Date
    Jul 2013
    Posts
    63
    Sounds like the board isn't the problem. I work on a lot of yorks. Not a fan. Check some of the temperature sensors resistance once they're to the normal operating temperature. I've had discharge temp sensors be fine when cold and way out of spec hot.

  4. #4
    Join Date
    Sep 2003
    Location
    Western PA
    Posts
    1,339
    That's it. Always something simple. On the new board, the A1 and A2 terminals were re-positioned. I totally missed them and didn't install the jumper.
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  5. #5
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,365
    Quote Originally Posted by targetman View Post
    That's it. Always something simple. On the new board, the A1 and A2 terminals were re-positioned. I totally missed them and didn't install the jumper.
    Yah that'll do it lol. I work on a boatload of yorks especially sunlines ... Mike19 nailed it on the head. You remember that info you won't go wrong checking out these little boards

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