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Thread: w7900

  1. 03-18-2012, 02:35 PM #1
    spyder00087
    spyder00087 is offline Professional Member
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    w7900

    What type of signal should p1 and p2 recieve?
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  2. 04-09-2012, 08:36 AM #2
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    ga1279
    ga1279 is offline Professional Member*
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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
    Of all the things I have lost in my life, I miss my mind the most-GEO
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