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  1. #1
    Join Date
    May 2012
    Location
    MD
    Posts
    32

    Carrier Fan Coil 5K Heater Circuit Breaker Size

    My Carrier FE4ANB005 Fan Coil has 10K and a 5K heater pack, the 10K is fed by a 60 amp circuit the 5K is fed by a 30 amp circuit, but the fan coil has two 10K (60 amp) breakers.

    The reason I’m asking is the 30 amp breaker on my load center that feeds the fan coil/5k Heater has tripped about 10 times this winter.

    I replaced the 30 amp breaker Saturday, today the installer ran an electric heat test and inspected the wiring, he said he didn’t find any problems, but he also didn’t take any current readings.

    This system is less than one year old.

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,057
    The breakers on the heat kit are more of a service disconnect and dead short protection. Your 60 & 30 in the main panel are right. Maybe a bad breaker.

    Sent from my HTC VLE_U using Tapatalk 2

  3. #3
    Join Date
    May 2012
    Location
    MD
    Posts
    32
    I guess the installer was out of 30 amp breakers, when they installed they system they borrowed a can of spray foam and a role of aluminum tape from another contractor who was residing my house.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,880
    The breakers in the unit come from the factory.
    Contractor locator map

    How-to-apply-for-Professional

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

  5. #5
    Join Date
    May 2012
    Location
    MD
    Posts
    32
    Looking at the product data sheet two 60 amp breakers is correct.
    If I'm reading the product guide correctly FE4ANB005 Fan Coil with a 5K heater pack calls for 8 gauge wire and a 35 amp breaker, mine is wired with 10 gauge wire with a 30 amp breaker.
    A 5KW heater should be pulling about 20 amps, that leaves 10 amps for the blower motor and electronics.

  6. #6
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,743
    Sounds like a week breaker to me, which should be resolved now that its been changed. Has it tripped since changing the breaker?

  7. #7
    Join Date
    May 2012
    Location
    MD
    Posts
    32
    No not since the breaker was replaced, the last time it tripped the temp was in the low 20's.
    The old breaker tripped intermittently about 10 times since the winter season started.
    I have an infinity tstat running the electric heat test did not trip the old breaker.

  8. #8
    Join Date
    May 2012
    Location
    MD
    Posts
    32
    It's not the breaker the new breaker just tripped.
    I was able to duplicate the problem by running the heat test for 10 minutes instead of the default 5.
    The wires and breakers are warm and the technician who was out earlier didn't check the current draw.

  9. #9
    Join Date
    May 2012
    Location
    MD
    Posts
    32
    Am I wrong?
    Name:  FE4ANF005T Fan Coil.jpg
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  10. #10
    Join Date
    Aug 2012
    Posts
    2,643
    Sounds like you have a short or some loose wires or maybe a incorrectly wired heat strip. Pictures would help.
    My name is TooCoolforschool and I am a chronic over charger.

  11. #11
    Join Date
    May 2012
    Location
    MD
    Posts
    32
    Quote Originally Posted by toocoolforschool View Post
    Sounds like you have a short or some loose wires or maybe a incorrectly wired heat strip. Pictures would help.

    Nope I checked the wiring and a technician checked it again on Monday.
    Did you look at the product data sheet? The minimum ampacity is 33.5 amps, including blower motor.

  12. #12
    Join Date
    May 2012
    Location
    MD
    Posts
    32
    I was wrong the wring and the circuit breakers are correct the technician told me I had a 5k and a 10k heater pack I don’t, I actually have a 15k heater pack. The dealer is replacing it tomorrow.

  13. #13
    Join Date
    Mar 2009
    Location
    Mount Holly, NC
    Posts
    3,097
    a 15K heater pack is actually 3 - 5 K heat strips... it's all in how it's wired.
    the problem is HEAT on the conductor... 5K with 240v can pull over 22 amps, and undersized wire, with crimp connectors, with sequencers and other points of resistance and you can easily overtemp a 30 amp breaker.
    if you have #10 wire, and a 30 amp breaker, you will need to upgrade the wiring to the furnace, to increase the breaker size.

    if the breaker trips more than ONE TIME there is a problem that must be addressed.
    if the first technician cannot find a problem, do not pay him, and get a technician that CAN find the problem.
    The TRUE highest cost system is the system not installed properly...
    The three big summer hearththrobs...
    Mel Gibson
    Dwane Johnson
    The A/C repairman

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