(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 7 of 7

Thread: potential relay

  1. #1
    DIY Junior Member tom-rad's Avatar
    Join Date
    Sep 2007
    Location
    Maryland
    Posts
    23

    Default potential relay

    Can anyone tell me what would cause a potential relay to not open?
    Original issue began with chattering relay, then no startup (bad run cap found also).
    The relay has been changed, and I get 200v on the caps at startup. Bad compressor winding maybe? It's a Bryant/Carrier Two speed. Compressor runs about 10-12 seconds, then trips overload.
    Thanks.

  2. #2
    DIY Junior Member tom-rad's Avatar
    Join Date
    Sep 2007
    Location
    Maryland
    Posts
    23

    Default more information

    Quote Originally Posted by tom-rad View Post
    Can anyone tell me what would cause a potential relay to not open?
    Original issue began with chattering relay, then no startup (bad run cap found also).
    The relay has been changed, and I get 200v on the caps at startup. Bad compressor winding maybe? It's a Bryant/Carrier Two speed. Compressor runs about 10-12 seconds, then trips overload.
    Thanks.

    Start cap is ok, Potential relay is new, run cap is new. 234v on contactor when compressor is running.
    I found the pick up voltage to measure only 140-200v before it shuts down, and the relay PU needs to be 295-324. The relay DO is 60-135.
    I've narrowed it down a bit, lol. Any clues? Thanks.

  3. #3
    Jack of all trades DonL's Avatar
    Join Date
    Mar 2011
    Location
    Houston, TX
    Posts
    3,642

    Default

    Did You replace the Cap with the proper Run Cap ?

    There is a difference in run and start caps.

    Does the run winding measure good ?

    Does the new cap get hot ?


    Good Luck.
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  4. #4
    DIY Junior Member tom-rad's Avatar
    Join Date
    Sep 2007
    Location
    Maryland
    Posts
    23

    Default

    Thanks Don, the 25uf GE Genteq run cap is identical to the original, same part number also.
    I'm going to check the run winding tomorrow, got too late to work on it today.
    The new cap doesn't seem to get hot, but the unit shuts down pretty quick.
    Thanks again. Will post results if I ever get this figured out.

  5. #5
    DIY Junior Member tom-rad's Avatar
    Join Date
    Sep 2007
    Location
    Maryland
    Posts
    23

    Default update - checked compressor windings

    Quote Originally Posted by tom-rad View Post
    Thanks Don, the 25uf GE Genteq run cap is identical to the original, same part number also.
    I'm going to check the run winding tomorrow, got too late to work on it today.
    The new cap doesn't seem to get hot, but the unit shuts down pretty quick.
    Thanks again. Will post results if I ever get this figured out.
    Ok, I've narrowed this down a bit - as a matter of fact, I believe the trouble isn't electrical. I checked the compressor windings and the dc resistance is right where it should be, and with no shorts.
    Symptom:
    The compressor runs about 15 seconds before I get a thermal overload shutdown error. I also noticed that:
    1 - the compressor does not generate a high enough emf to open the potential relay;
    2 - the reversing valve does not switch, either in 'checkout' mode for a/c or heat.

    I am no expert on refrigeration, but I'm guessing either high pressure, or missing some refrigerant.
    This is a Bristol two speed (Bryant 698B, from 2005 heat pump) compressor, with R410A , or Puron. Anyone have any ideas? And, as I mentioned, I'm out of work, so have to do as much as I can myself. Thanks.
    Last edited by tom-rad; 11-20-2013 at 10:27 AM. Reason: additional information added

  6. #6
    Jack of all trades DonL's Avatar
    Join Date
    Mar 2011
    Location
    Houston, TX
    Posts
    3,642

    Default

    Is that new relay made for your compressor ?

    Maybe try the old relay ? If the cap was bad then the old relay may be OK.

    If the compressor never comes out of start maybe the compressor could have a mechanical problem.

    A amp probe would be a good tool to pin the problem down.


    Good Luck.
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  7. #7
    DIY Junior Member tom-rad's Avatar
    Join Date
    Sep 2007
    Location
    Maryland
    Posts
    23

    Default thanks for the reply

    Quote Originally Posted by DonL View Post
    Is that new relay made for your compressor ?

    Maybe try the old relay ? If the cap was bad then the old relay may be OK.

    If the compressor never comes out of start maybe the compressor could have a mechanical problem.

    A amp probe would be a good tool to pin the problem down.


    Good Luck.
    Yes, identical relay, same part number. Same symptoms with both old and new relay.
    Don't have a clamp-on ammeter right now, but considering the drop of about 6v under load, I believe the compressor is ok electrically.
    Weather has been mild, but over the weekend it's going to get colder. May have to get a loan and call the local Carrier service tech.

Similar Threads

  1. Where to buy potential relay online?
    By Windscreen in forum Pumps and Tanks Well Forum & Blog
    Replies: 3
    Last Post: 01-29-2013, 05:39 AM
  2. "Potential Starting Relay"
    By lzenglish in forum Pumps and Tanks Well Forum & Blog
    Replies: 22
    Last Post: 10-01-2009, 07:21 AM
  3. Is this symptomatic of a potential problem?
    By davidyal in forum Water Heater Forum, Tanks
    Replies: 6
    Last Post: 02-24-2009, 04:22 PM
  4. Grounding, bonding, potential??
    By hammerslammer in forum Electrical Forum discussion & Blog
    Replies: 4
    Last Post: 08-21-2007, 09:51 AM
  5. Two piece toilets - leak potential??
    By goshenplumber in forum Toilet Forum discussions
    Replies: 6
    Last Post: 03-08-2007, 04:23 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •