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  1. #1

    york defrost board test sequence

    on a 13 seer York heat pump will the board stay in defrost after jumping the test pins like most other brands when the coil is iced?

  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,792
    Should stay in defrost until Tstat opens. It may terminate after 60 minutes. Most boards do

  3. #3
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    5,396
    Quote Originally Posted by Bpal02 View Post
    on a 13 seer York heat pump will the board stay in defrost after jumping the test pins like most other brands when the coil is iced?
    When the TEST terminals are used to force a defrost cycle, the control will ignore the state of the liquid line temperature and outdoor ambient temperature inputs. The coil does not have to be cold and the outdoor temperature does not have to be within a certain range for the heat pump to be forced into a defrost cycle.

    After the TEST terminal jumper is removed, the defrost mode will be terminated as normal - Liquid line temperature reaches 80F or after eight minutes of defrost operation.

    The defrost cycle length timer will not be started until the TEST input is removed. If the TEST terminals remain shorted, the control will keep the unit in defrost mode.
    Instead of learning the tricks of the trade, learn the trade.

  4. #4
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,018
    On the York 13seer LX model I just put in - it had time/temp.

    There are 2 different board that look very similar.

    Rundawg described the demand defrost board.

    It is important to know which one you have.

  5. #5
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,465
    All LX except the 5 ton have time temp which work like any other time temp but the 5 ton LX and the affinity line have the York guard demand defrost board which is the sequence rundawg posted. The older steller series also use the York guard.

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