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  1. #1

    mystery low voltage problem/ brain fart?

    Hi, all, I'm brand new to the forum but in the trade since 87. Installed a Payne 2 ton 13 SEER r-410A heatpump system in a customers house, 7.5 kw strip heat. $ job took 3 hrs start to finish, and re-used customers honeywell 5000. 2 days later, the od unit is froze up in 30 temps and sounds like a cat trying to get out on defrost. Reversing valve is too small from factory. switched to Goodman od unit, ran fine, a few days later cust has no heat. found popped fuse and no cause for pop. replaced fuse, heat for a few days and pop again, now customer is getting pissed. Ohm'd all stat wires, all the same, no indication of a rub or staple problem, pulled all stat wires from in the walls to show new copper, re-wired, ran fine today, popped again tonight. customer is threatening me with voodoo bad ****, haitian so I believe her! but meanwhile there has to be a logical reason it's popping, I'm just brain farting enough to not find it. Any help appreciated, don't want to be a zombie! Jim
    Last edited by beenthere; 02-09-2013 at 06:45 AM. Reason: Price

  2. #2
    Join Date
    Jan 2009
    Location
    Salisbury, Maryland
    Posts
    140
    Hey Jim. So, it sounds like the low volt problem started after you switched the OD unit? I would start simple and make sure the XFMR in the AH is tapped right depending on type of HV feeding it. Energize each circuit independentely (G, W1, O, and Y) and measure your current on the LV side of the XFMR and see if you get a large jump. It would also help if you took out one time fuse and hooked up a resetable one while your troublehsootin' to save some fuses too. If you don't get anywhere with that, I would double check where all the wiring enter's cabinets to ensure its not chaffing. Check the factory wiring too on the outdoor unit. It could be that when the RV is energized for defrost, as 24v is sent to the valve, some wiring may be chaffed against the copper or pinched somewhere against cabinet. Also, you re-used stat? Double check the wiring and programming on the thing.

  3. #3
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    3 hours to install a complete system?
    If more government is the answer, then it's a really stupid question.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,935
    Quote Originally Posted by mark beiser View Post
    3 hours to install a complete system?
    That stood out to me too.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,197
    If I understand this right, you put a new split system in, a few days later you replaced the outdoor unit with a different brand unit because of a problem & now you're having a problem with the fuse blowing in the inside unit. You might want to try putting new shingles on the roof to see if that solves the fuse problem. All kidding aside have you tried running the unit in cooling? Since the short sounds intermittent maybe it happens when the unit goes into defrost & there's a wiring problem or a bad RV solenoid.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  6. #6
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    I real concerned with the hp brand swapping thing.....................something stinks
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  7. #7
    Join Date
    Jun 2006
    Location
    Richmond, VA
    Posts
    2,884
    Quote Originally Posted by dandyme View Post
    I real concerned with the hp brand swapping thing.....................something stinks
    X2

    He can always just throw another outdoor unit at it. Since he already used a payne and gooman...how about a Haier.
    Give a man a fish, he will eat for a day. Teach a man to fish, he will eat for a lifetime.

    Give a man a capacitor, doesn't know what to do. Teach a man to install it, now he knows everything.

  8. #8
    Join Date
    Jan 2007
    Location
    Pittsburgh
    Posts
    181
    Quote Originally Posted by jim hoover View Post
    Hi, all, I'm brand new to the forum but in the trade since 87. Installed a Payne 2 ton 13 SEER r-410A heatpump system in a customers house, 7.5 kw strip heat. $ job took 3 hrs start to finish, and re-used customers honeywell 5000. 2 days later, the od unit is froze up in 30 temps and sounds like a cat trying to get out on defrost. Reversing valve is too small from factory. switched to Goodman od unit, ran fine, a few days later cust has no heat. found popped fuse and no cause for pop. replaced fuse, heat for a few days and pop again, now customer is getting pissed. Ohm'd all stat wires, all the same, no indication of a rub or staple problem, pulled all stat wires from in the walls to show new copper, re-wired, ran fine today, popped again tonight. customer is threatening me with voodoo bad ****, haitian so I believe her! but meanwhile there has to be a logical reason it's popping, I'm just brain farting enough to not find it. Any help appreciated, don't want to be a zombie! Jim
    A new Payne to A new goodman ? In matter of day because of a wiring problem ? Did you change out indoor unit ? 3 hours ? Did you use a vacuum pump ? How did you determine the reversing valve was "too small" ? Im not sure I understand that ? As for the voodoo, maybe prayer, spiritual healing and holy water may help on this issue or even with faults with the equipment.

  9. #9
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    18,396
    Quote Originally Posted by dandyme View Post
    I real concerned with the hp brand swapping thing.....................something stinks
    In Philly, they say "it fell off the back of a truck...."
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  10. #10
    Join Date
    Feb 2010
    Location
    Calgary, Alberta
    Posts
    1,105
    On a 3 hour install, I bet there's lots of tin tape holding things together. Maybe that's the problem.

  11. #11
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,197
    If you've really been in the trade for 25 years then you'd understand why by what you posted, its hard to believe you've been in the trade for 25 years.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  12. #12
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    Voodoo huh? The worst I had a customer do to me was make me eat crappy food they made in front of them lol, sometimes it's hard to say no when people offer you things.

  13. #13
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,591
    'm more concerned about the whole brain fart thing. My brain used to do that when I had what doctors diagnosed "$hit for brains" I think I got it all out, although some would wonder...
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

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