How old are these fuses?

Discussion in 'HVAC Heating & Cooling' started by Phillbo, Jul 14, 2009.

  1. Phillbo

    Phillbo New Member

    Messages:
    77
    Location:
    Arizona
    If you were to guess, How old would you say these fuse's are?

    Not even sure what the one on the right is .... Should these be in a 5 ton heat pump rated for 50amp? They are 45amp.

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  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Well, I don't think you see Gould fuses any more. I could be wrong, but I think FerrazShawmut bought up that brand.

    Anyway, 45 amps could be in the ballpark for a 5 ton condenser.
  3. Phillbo

    Phillbo New Member

    Messages:
    77
    Location:
    Arizona
    So, probably more than 1 year old.
    Last edited: Jul 15, 2009
  4. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    I got 24A for a 5 ton heat pump with COP = 3 at 240v. Start up current may be 6x higher.

    Wrap the fuse in several layers of newspaper and hit it with a hammer. If the fuse element inside is only cracked in one place it was a fatigue failure or a mild overload. If the element is splattered it was a heavy overload.
    Last edited: Jul 14, 2009

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