Results 1 to 11 of 11
  1. #1

    Confused Phase rotation reversed

    Phase rotation(sequense) of panel feeding HVAC unit got reversed. When unit started smoke came out of vents. Unit stared in heating mode. Any idea what happened and what to fix.

  2. #2
    Join Date
    Aug 2012
    Posts
    2,643
    What type of unit is this three phase, single phase, Resi or commercial, what burned up, have you had anyone look at it yet?
    My name is TooCoolforschool and I am a chronic over charger.

  3. #3
    three phase commecial unit. Unit seems to be working fine now after phase rotation was corrected. I saw smoke from vents. Something burned temporarily. What could it be. Where to look.

  4. #4
    Join Date
    Feb 2013
    Location
    New Orleans, LA
    Posts
    91
    Is it a new unit? Also, what brand/type?

  5. #5
    Join Date
    Aug 2012
    Posts
    2,643
    Quote Originally Posted by HVACAMAR View Post
    three phase commecial unit. Unit seems to be working fine now after phase rotation was corrected. I saw smoke from vents. Something burned temporarily. What could it be. Where to look.
    I would start with the motor if I was qualified to do so.
    In other words it could bre hazordous.
    My name is TooCoolforschool and I am a chronic over charger.

  6. #6
    Join Date
    Mar 2012
    Location
    West Chester, PA
    Posts
    511
    blower motor if anything

  7. #7
    Join Date
    May 2006
    Location
    Raleigh N.C.
    Posts
    277
    If not a fried motor I have had knuckle heads leave or put paper in the returns.
    Damn phosgene

  8. #8
    Join Date
    Dec 2004
    Location
    Caledonia WI
    Posts
    881
    Don't give us a clue what it is, just let us guess. If its electric heat the coils will smoke if you don't move air across them but they can still work if you catch it quickly enough.
    Nothing is magic, it works or doesn't work for a reason.

  9. #9
    Join Date
    May 2006
    Location
    Raleigh N.C.
    Posts
    277
    A new oily HX with low airflow makes a nice cloud too.
    Damn phosgene

  10. #10
    Join Date
    Oct 2002
    Posts
    1,278
    overheating,with not enough air flow.

  11. #11
    Join Date
    Mar 2013
    Location
    Joplin,Missouri
    Posts
    310
    Call a professional and have the unit checked out would be the wisest thing to do

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