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  1. #1
    Join Date
    Jun 2009
    Location
    Ontario, Canada
    Posts
    1,029

    looking for lennox GCS3-957-250A-10J manual

    Hello folks,

    I'm looking for wiring diagram/schematic for this old beast. m/n: GCS3-957-250A-10J. I have spent way too long on it trying to revive it back to life. My boss found a diagram on the internet, but it's for the wrong GCS3 model. We kinda got it going, but now it has conk out some more and I need the exact diagram. since the other one that we tried to get it going is not the exact one there's a lot of component that's not on it. there's a wire we found disconnected, but not sure where it goes. it's live 120V just laying around in the cabinet. comes out of one of the fuse boxes on the right hand side of the electrical compartment.

    I have replaced K3 relay, K12 sequencer and it has new control transformer. Spent 7 hours yesterday just tracing wire and trying to get it going. I don't have 230V to the control transformer. but as soon as that wire jumped to the other line voltage feeding the xfformer I have 24V and the unit will run. the xformer connection is just a maretted juction directly from the step down in the blower compartment. that wire I was talking about has female spade connector on it, so it's design to go to a terminal somewhere.

    all the colour of the wiring has turned white, so that doesn't help either. thanks a bunch if you could find one for me. old timers here might have some diagram.
    Parts Changer Extraordinaire
    ------------------------------------------------------
    Have tools and gauges, will travel.

    RIDGID|YELLOW JACKET|UEI|TESTO|STANLEY|CPS|VETO| KLEIN|MILWAUKEE|MASTERCRAFT|

  2. #2
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    5,528
    Quote Originally Posted by blitz View Post
    I'm looking for wiring diagram/schematic for this old beast. m/n: GCS3-957-250A-10J.
    Are you sure the model number isn't GSC3-953?

    Check your email.
    Instead of learning the tricks of the trade, learn the trade.

  3. #3
    Join Date
    Jun 2009
    Location
    Ontario, Canada
    Posts
    1,029
    Quote Originally Posted by rundawg View Post
    Are you sure the model number isn't GSC3-953?

    Check your email.
    not 100% sure,, the stamped on rating plate is full of pock mark from the last roofing job they did.
    Parts Changer Extraordinaire
    ------------------------------------------------------
    Have tools and gauges, will travel.

    RIDGID|YELLOW JACKET|UEI|TESTO|STANLEY|CPS|VETO| KLEIN|MILWAUKEE|MASTERCRAFT|

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