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  1. #14
    Join Date
    Mar 2008
    Posts
    257
    If I remember we have a main liquid line solinoid with a 20 lb loaded check on the right, beside control pannel for cool gas differential. This is the same on both med and low, they did alot of med temp cool gas defrost back then. The defrost slide valves are no fun to work on.

  2. #15
    Join Date
    Nov 2005
    Posts
    386
    A1-comp #1
    A2-comp#2
    A3-comp#3
    A4-comp#4
    AD-defrost timer or controller
    AL-low liq alarm
    AS1-satellite comp #1
    AS2-satellite comp# 2

  3. #16
    Join Date
    Nov 2005
    Posts
    386
    older racks late 70's early 80's

    A9- timer motor
    A15- satellite
    A16- satellite

    Also there is high suction button on some racks.
    AT- I think is low pressure
    WTF- On most racks only between 2am and 6am

  4. #17
    Join Date
    Jul 2011
    Location
    Nanaimo,BC, Canada!
    Posts
    346

    Smile

    I have 3 of these racks at one of my stores, not exact model number but same era, same control strategy I actually happen to have a schematic I drew up ( the old school way) I'll try n scan it this week and send it to you!!

    And as indicated al is low liquid level alarm, and at is defrost timer alarm..

  5. #18
    Join Date
    Sep 2011
    Location
    Plainfield IL
    Posts
    101
    Gosh that is an old rack. I havent worked on one of those in years. So far the guys are correct. I thingk too that the middle buttons were for each compressor alarm circuit as well.

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