Results 1 to 7 of 7
  1. #1
    Join Date
    Jun 2005
    Location
    Florida
    Posts
    6

    Confused

    Ruud 3 ton straight cool with heat strips. This unit is for my Garage/shop. The contactor had the dreaded ant across the contacts and burned the contactor up. I replaced the contactor and now have nothing unless I manual momentarily push the contactor in by hand. I have checked the t-stat and even replaced it with a known good one, but no luck. Today I got in the attic and used the volt meter to check the control transformer. I had 240 volts in on the correct taps for input and nothing on the re coming out..... Guess that means a trip to the parts house. Could the ct have gotten trashed by the contactor having arced around the ant that was in there making it chatter?? Never had a bad ct before...

  2. #2
    Join Date
    Nov 2003
    Posts
    125
    You probably blew the low voltage control fuse when you were doing the contactor.

  3. #3
    Join Date
    Jun 2005
    Location
    Florida
    Posts
    6
    I do not see a fuse on the lo voltage circuit. Where in the air handler would it be?uud unit and did not see it on the schematic...

  4. #4
    Join Date
    Jun 2005
    Location
    Florida
    Posts
    6
    Also would I still get no votage right at the transformer even though I have 240 going in????

  5. #5
    Join Date
    Jan 2003
    Posts
    539
    Transformer is dead. A lot of unit don't have fuse. You might want to install a fuse.

  6. #6
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,709
    if contactor had fried coil it would almost always wipe out transformer,if there was no fuse in low voltage circuit.

  7. #7
    Join Date
    Jun 2005
    Location
    Florida
    Posts
    6

    Thumbs up

    All fixed now!! It was the control trans. Only time I had to replace one. Imagine that, living in the lightning capitol of the world!!!

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