Page 1 of 3 123 LastLast
Results 1 to 13 of 37
  1. #1

    My first blown transformer! (I'm so proud)

    Went to jump out a water source heat pump today using R to Y1 (the maintenance guys would of had to start it using their automated system, and they typically don't want to be bothered). It still wouldn't energize so I decided to take the jumper off (with 460 volts still flowing through). One side of my beautiful little magnetic jumper wire (those $10 yellow ones) popped off and instantly stuck to some other metal, apparently grounding the transformer. Sparks and smoke...kicked the breaker....so I ended up bothering the maintenance guys anyway (didn't know where the breaker box was).

    Hope this makes your day seem a little less worse.

  2. #2
    Join Date
    Feb 2013
    Location
    Lamar, SC
    Posts
    528
    I did better than that yesterday. I got my assignments in the morning and I accidentally went to the billing address instead of the place I was supposed to go (laundromat franchises). I did tune ups on 3 machines and was almost completely done, only thing left was to wash the condensers so I started to do the paperwork before my hands got wet and discovered my mistake then. I called the office and told dispatch what happened, and she said they didn't have tune ups done at that location. No wonder the indoor coils were so dirty. I went ahead and finished, had the attendant sign the paperwork, and drove 30 minutes to the right location, 3 hours behind schedule LOL.
    "If you've eliminated all other possibilities whatever remains must be the truth."

  3. #3
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    436
    Austin, you need electrical training. You must be very careful jumping out any voltage above 24v if you do it at all. Never take high voltage for granted especially any high amperage circuits. What kind of circuit flows 480v thru R & Y1 connections. Sounds like you shorted the primary side. What was the secondary voltage?

  4. #4
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,355
    what? no pictures?

    the worst thing that i heard happen was a 7.5 ton compressor changeout at a mall. the guys i used to work with changed the compressor in a unit that was working and was for the space next door to the failed unit!
    "Mother" is the name for God on the lips and hearts of children....The Crow

  5. #5
    Quote Originally Posted by Capz View Post
    Austin, you need electrical training. You must be very careful jumping out any voltage above 24v if you do it at all. Never take high voltage for granted especially any high amperage circuits. What kind of circuit flows 480v thru R & Y1 connections. Sounds like you shorted the primary side. What was the secondary voltage?
    460 volt primary, 24 volt secondary, result of mistake was an open primary coil. I do have electrical training, but I got in a big hurry and attempted to do something which I have not been trained to do yet. Won't do that again.

  6. #6
    Join Date
    May 2011
    Location
    Western, KY
    Posts
    3,156
    Quote Originally Posted by jayguy View Post
    what? no pictures?

    the worst thing that i heard happen was a 7.5 ton compressor changeout at a mall. the guys i used to work with changed the compressor in a unit that was working and was for the space next door to the failed unit!
    I worked with a guy who was a good tech but I got a call to help him on a compressor changeout, got there and he was taking out a compressor on a RTU he had installed the day before but on the wrong unit that didn't have any problems, he was pretty upset about it but the paperwork was not clear and he didn't diagnose the original unit.

    Then there was my last company where a resi pack unit was pulled out and rolled off to the side until the HO came out and freaked because it was the wrong unit, they had another pack around the corner. They were told the wrong unit on that one.

  7. #7
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    Quote Originally Posted by jmsmars1 View Post
    I did better than that yesterday. I got my assignments in the morning and I accidentally went to the billing address instead of the place I was supposed to go (laundromat franchises). I did tune ups on 3 machines and was almost completely done, only thing left was to wash the condensers so I started to do the paperwork before my hands got wet and discovered my mistake then. I called the office and told dispatch what happened, and she said they didn't have tune ups done at that location. No wonder the indoor coils were so dirty. I went ahead and finished, had the attendant sign the paperwork, and drove 30 minutes to the right location, 3 hours behind schedule LOL.
    Been there lol. I was trying to find a house in a small town and the only house without a number on it was the one I thought could be it. Door was unlocked, they had an oil furnace and that's what I was looking for. I had it pulled apart and the nozzle size didn't match what was on my sheet (we keep track of that stuff), so I did some snooping and realized it was the wrong house lol.

  8. #8
    Join Date
    Dec 2008
    Location
    Ontario Canada
    Posts
    545
    Magnetic jumper?

  9. #9
    Join Date
    Jun 2009
    Location
    South Carolina
    Posts
    467
    We had one last summer.
    compressor went out and we got an okay to install a new condenser . These guys were not thinking. We had three guys go over to change the CU out because it was 12' plus in the air so we had to use our Genie lift and such. They pumped it down and threw the unit off the stand to the ground below. Come to find out they tore the wrong unit out. They tidied up the panels back out and put it back on the stand and installed the new condenser in place of the bad. Somehow the condenser that got a nice drop is still running today. The invoice had the model and serial number of bad system but their explanation was the new condenser was so big so we changed out the bigger unit WTF. 13 seers are bigger than 10 seer. Uhh enough of my rant it was a very stressful day


    o yeah and one time a tech installed a compressor at the wrong house so he had to put the old back in their unit and go install the new one next door. He didnt check the address on the house with the ticket

  10. #10
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    436
    Quote Originally Posted by HVAC_Austin View Post
    460 volt primary, 24 volt secondary, result of mistake was an open primary coil. I do have electrical training, but I got in a big hurry and attempted to do something which I have not been trained to do yet. Won't do that again.
    You tend to remember mistakes made when it involves a big **S spark and tripped breaker.
    And there is no trainer or training which will show you how to jump 460v connections. Not in my book or experiences anyway. Take care.

  11. #11
    Join Date
    May 2009
    Location
    Savannah, Ga/H.H. Island, S.C.
    Posts
    1,460
    Quote Originally Posted by Joehvac25 View Post
    Been there lol. I was trying to find a house in a small town and the only house without a number on it was the one I thought could be it. Door was unlocked, they had an oil furnace and that's what I was looking for. I had it pulled apart and the nozzle size didn't match what was on my sheet (we keep track of that stuff), so I did some snooping and realized it was the wrong house lol.
    This happened once when I was helper (many years ago). We were dispatched to a specific address; the number was something like 234...we went to 324 or something like that. It was a service call and the unit was broken! Frozen up. They let us in, we fixed, and left....billed the original customer. We only figured out our mistake when the right homeowner called wanting to know where we were!

  12. #12
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    Magnetic jumper wires just seem like an accident waiting to happen, they are made to stick to metal and we know how that turns out.

  13. #13
    Quote Originally Posted by LKJoel View Post
    Magnetic jumper?
    They sounded like a good idea, but like Joehvac25 says they apparently can cause problems if you're not careful. Will think very carefully before using them again. Picture below.

    Name:  Jumper.jpg
Views: 531
Size:  181.3 KB

Page 1 of 3 123 LastLast

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