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Thread: w7900

  1. #1
    Join Date
    Sep 2009
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    What type of signal should p1 and p2 recieve?

  2. #2
    Join Date
    Jan 2005
    Houston TX
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    P1-P2 P on me

    spyder- None, all it is there for is to enable periodic pump-out as needed when jumpered, after 1/2 hour if the low pressure switch on the idle compressor makes (rise in pressure) it will start that compressor to pump out the evaporator section, suction line and crankcase. I've always installed a jumper on those terminals. Trane charged some ungodly amount to include PP as an optional control, when they finally caught on the engineers replaced the W7900. Hope this helps.-Geo
    Once in a while everything falls into place and I am able to move forward, most of the time it just falls all over the place and I can't go anywhere-GEO

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