Results 1 to 5 of 5
  1. #1
    Join Date
    May 2008
    Posts
    84

    heat pump Indoor fuse keeps closing

    My heat pump worked well during the winter, but when the outside temperature started to climb up around 40F, I had to reset the fuse on my electrical pannel twice already.

    The blower kept working even though the heat pump was no longer getting any juice. I only noticed it because the indoor temp started to go down. The Aux heat was set not to kick in above 23F.

    The fuse is rated at 30Amps, way above what the heat pump needs at this temp which is around 15Amps according to the manual.

    MODEL: ASZ180481A* / CA*F4860*6A*+TXV/ MBE2000**-1 HEATING OPERATION
    Outdoor Ambient Temperature
    ..temp 47 45 40 35 30 25 20
    ...MBh 62.2 58.9 55.4 51.8 49.5 48.0 44.6
    DeltaT 32.9 31.2 29.3 27.4 26.2 25.4 23.6
    ....KW 3.80 3.72 3.64 3.56 3.52 3.49 3.41
    ..AMPS 17.0 15.7 14.7 13.8 13.2 13.0 12.2
    ...COP 4.80 4.64 4.46 4.26 4.12 4.03 3.82
    ...EER 16.4 15.8 15.2 14.5 14.1 13.8 13.1
    .HI PR 398 382 367 351 343 336 323
    .LO PR 37 127 119 109 103 99 91

    I am planing to call the contractor on monday but any suggestions would be apreciated. Any idea what could cause the indoor fuse to blow like this ?

  2. #2
    Join Date
    Nov 2000
    Posts
    1,251
    Have your contractor check the MCA listing and also the Maximum Fuse Size listing on the model number plate. A 4 ton unit on a 30 amp breaker sounds wrong to me. The wire size also should be checked.
    "You do not merely want to be considered just the best of the best. You want to be considered the only ones who do what you do.".... Jerry Garcia
    "You just have to decide if you're a Tigger or an Eeyore,..I think you know where I stand on the great Tigger/Eeyore debate." Prof. Randy Pausch

  3. #3
    Join Date
    May 2008
    Posts
    84
    Quote Originally Posted by lbf View Post
    Have your contractor check the MCA listing and also the Maximum Fuse Size listing on the model number plate. A 4 ton unit on a 30 amp breaker sounds wrong to me. The wire size also should be checked.

    the model number plate says
    MAX. FUSE AMPS OR MAX CIRCUIT BREAKER 40
    TIME DELAY FUSE OR HACR CIRCUIT BREAKER REQUIRED
    MIN CIRCUIT AMP: 29.2

  4. #4
    Join Date
    Apr 2008
    Location
    St Augustine
    Posts
    43
    That amana max fuse is 40 amp for 4 ton condenser..we have had alot of problems w the amana systems. most of them come over charged from the factory.and head pressures have beed getting up to around 600lbs....

  5. #5
    Join Date
    May 2008
    Posts
    84
    Quote Originally Posted by jweig20 View Post
    That amana max fuse is 40 amp for 4 ton condenser..we have had alot of problems w the amana systems. most of them come over charged from the factory.and head pressures have beed getting up to around 600lbs....
    The system was installed when the outside temp was already very cold. The contractor mentionned that at this temp he could not check the charge properly.

    So now that the temp is higher, I should ask them to make sure its not overcharged?

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