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  1. #1
    Join Date
    Jul 2007
    Posts
    65

    Jumping out Lennox gcs11 953 250

    Doing pm on rtu's. I came across 4 older Lennox rtu's gcs11. Not sure how to jump these out. From the looks of it dc voltage is run into a control panel and then over to another panel in comp section to what is labeled A1 logic panel. This controller has terminals labeled sen,stat,24vac,econo,and heat cool at top. Not sure where I would be able to jump this unit to test. Schematic not helping. I am use to seeing terminal strip with r y w g etc

  2. #2
    Join Date
    Aug 2012
    Posts
    2,663
    It sould have a test pin or something of that nature to run through the cycles, don't quote me though.

  3. #3
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,337
    If you pull the stat wires off the logic panel. Terminals 1-5. Then if you jump terminal 2 to 5, all heat stages will run. If you jump terminal 2 to 4, all cool stages will run.

    Here's the pdf for you....
    Attached Images Attached Images

  4. #4
    Join Date
    Jul 2007
    Location
    Delta BC Canada
    Posts
    91

    Smile Simulator

    THe simulator is the best option for servicing the w-973 panel.

  5. #5
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,615
    How can you do a PM without cycling the unit from the t-stat? T-stat is part of the system.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  6. #6
    Join Date
    Jul 2007
    Posts
    65
    Quote Originally Posted by ascj View Post
    If you pull the stat wires off the logic panel. Terminals 1-5. Then if you jump terminal 2 to 5, all heat stages will run. If you jump terminal 2 to 4, all cool stages will run.

    Here's the pdf for you....
    Thanks asjc, that information really helped.

    2sac, the stats are checked on pm's, but initially when on rooftop, units are jumped out ot test operation. Thanks all for your help.

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