Results 1 to 2 of 2

Thread: w7900

  1. #1
    Join Date
    Sep 2009
    Location
    Northeast
    Posts
    102

    w7900

    What type of signal should p1 and p2 recieve?

  2. #2
    Join Date
    Jan 2005
    Location
    Houston TX
    Posts
    874

    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

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event