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  1. #1
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,876

    Walk In Fan,LLS off timers.

    Had a WIF down for the count last night. No power to clock located at condensor. Found L1 power dead. L2 L3 still hot. Digital Time clock wired to L1 and L2. So of course it isn't running. Go to breaker panel. Breakers outputting 208v. WTF, maybe my wires busted. Climb up on top of walk in. Notice condensor power ran to jbox before heading up to roof penetration. Opened box and find L1 heading down to a door timer switch then it comes back up to the condensor. Well, theres my problem. The switch is not closing. By passed switch. And she's off and running. Anybody else run into this? Be aware. And don't wire a new time clock and contactor to L2 and L3. It may single phase the compressor when the resturant worker turns the door switch.

  2. #2
    Join Date
    Jul 2002
    Location
    SE Texas
    Posts
    439
    I'm assuming the switch is there in order to shut down the condensing unit while people are working the box, but I've never seen someone install a door timer/switch breaking line voltage to the condensing unit to accomplish this. There are more graceful ways of doing it.
    With your chrome heart shining in the sun, long may you run.

  3. #3
    Join Date
    May 2009
    Location
    The Pas, Manitoba Canada
    Posts
    212
    Had a door switch on a freezer (3 phase condensing unit) that only killed power to LLS and evap fans. Caused more problems than it was worth. Door curtain and jackets for the workers is the best.

  4. #4
    Join Date
    Jul 2002
    Location
    SE Texas
    Posts
    439
    Quote Originally Posted by K_Neil View Post
    Caused more problems than it was worth.
    Can you elaborate, please?
    With your chrome heart shining in the sun, long may you run.

  5. #5
    Join Date
    May 2009
    Location
    The Pas, Manitoba Canada
    Posts
    212
    Quote Originally Posted by SandShark View Post
    Can you elaborate, please?
    Door not getting closed properly was the big one.
    Fans sticking (freezing) when shut down for a few minutes then coil freezes up when the door is closed.
    Moisture at the switch causing it to either stay open or closed
    When the switch was removed there was no more problems.

  6. #6
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,876
    Quote Originally Posted by SandShark View Post
    I'm assuming the switch is there in order to shut down the condensing unit while people are working the box, but I've never seen someone install a door timer/switch breaking line voltage to the condensing unit to accomplish this. There are more graceful ways of doing it.
    Yeah, they should have just broke terminal 4 off the clock.

  7. #7
    Join Date
    Jul 2002
    Location
    SE Texas
    Posts
    439
    Quote Originally Posted by KB Cool View Post
    Yeah, they should have just broke terminal 4 off the clock.
    Bingo!
    With your chrome heart shining in the sun, long may you run.

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