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  1. #1
    Join Date
    Feb 2008
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    NC
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    15

    How many watts does my heat pump use?

    I couldn't find this information on the unit or online. It is a Trane 3 Ton split heat pump, outdoor section model # 4TWX4036A1000AB, Indoor section model# 4TEE3F37A1000AA.

    I would like to know how many watts are used with just the heat pump running and with heat pump and emergency heat.

    Thanks for the help.

  2. #2
    Join Date
    Sep 2005
    Location
    Texas
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    2,793
    volts X amps = watts

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,100
    The watts the HP uses will vary as the OD temp varies.
    The colder it is, the less watts it uses, it also provides less heat.
    You need to know the KW rating of your aux heat to know how many watts it uses.
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  4. #4
    Join Date
    Feb 2008
    Location
    NC
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    15
    Quote Originally Posted by beenthere View Post
    The watts the HP uses will vary as the OD temp varies.
    The colder it is, the less watts it uses, it also provides less heat.
    You need to know the KW rating of your aux heat to know how many watts it uses.
    Where can I find the rating for my aux heat? Is is not the same for all of the model # I listed?

    Is the a graph somewhere of the HP power usage?

    Thanks

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,100
    The same size air handler can have different size strip heater packages.
    Contact the installing contractor, he should have the spec guide for the unit.
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  6. #6
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    The heat strip size should be marked on the exterior of the Air Handler.

    It is located on the data plate with model/serial. Below model/serial are several boxes and 1 should be checked or filled in to indicate what size heater is in the unit. Some people write in on the outside of the cabinet with marker to make it easier on the techs that come out.

    then, like said before, volt x amps = watts.

    example.... 10KW heater rated at 60 amps at 240 volts....

    60 x 240 = 14,400 watts.

    That is not exact nor will it be with your unit. Because the amps won't be exactly 60 and the voltage won't be exactly 240. Have a service tech take the measurements for you at your next routine service. Then you can do the math on your time.

  7. #7
    Join Date
    Apr 2005
    Location
    NE PA
    Posts
    698
    Quote Originally Posted by air2spare View Post
    volts X amps = watts
    Actually volts x amps = VA

    volts x amps x PF = watts

    Compressors are not unity PF so there is some difference (watts will be lower than VA by 10-15&#37.

    paul

  8. #8
    Join Date
    Jun 2007
    Location
    The Twilight Zone
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    2,964
    Quote Originally Posted by adama View Post
    I couldn't find this information on the unit or online. It is a Trane 3 Ton split heat pump, outdoor section model # 4TWX4036A1000AB, Indoor section model# 4TEE3F37A1000AA.

    I would like to know how many watts are used with just the heat pump running and with heat pump and emergency heat.

    Thanks for the help.
    That is a 3 ton heat pump.

    I can give you figures for my 3-ton Goodman heat pump so they should be in the ball park. The kw's are for the outside unit only.

    60F, 2.86 kw
    50F, 2.75 kw
    40F, 2.64 kw
    30F, 2.6 kw
    20F, 2.53 kw
    10F, 2.41 kw
    0F, 2.30 kw
    -10F, 2.19 kw

    Hope this helps.

    Take care.

  9. #9
    Join Date
    Feb 2007
    Location
    18951
    Posts
    1,593
    The easiest and most accurate way to find out is to turn everything off except the heat pump system and check your electric meter. First with no electric backup, and then with it.

  10. #10
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,295
    Quote Originally Posted by adama View Post
    I couldn't find this information on the unit or online. It is a Trane 3 Ton split heat pump, outdoor section model # 4TWX4036A1000AB, Indoor section model# 4TEE3F37A1000AA.

    I would like to know how many watts are used with just the heat pump running and with heat pump and emergency heat.
    2.85 kW average for 4TWX4036

    8 kW or 10 kW may be typical auxiliary heat on a 3-ton for Southern U.S. 10 to 15 kW for Northern U.S.
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  11. #11
    Join Date
    Jun 2003
    Location
    Morehead City, North Carolina
    Posts
    174
    14 SEER = 14,000 btu/ kwh
    36,000btu = 2.57kw
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  12. #12
    Join Date
    Jun 2007
    Location
    The Twilight Zone
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    Quote Originally Posted by capecool View Post
    14 SEER = 14,000 btu/ kwh
    Wrong (sorry). So a 14 SEER only produces 14,000 btu/hour? That would be a little more than 1 ton.

    SEER = EER (at 82F) x fudge factor, for a fixed speed air handler.

    For a v-s air handler, the calc is much more complicated.

    Take care.

  13. #13
    Join Date
    Jun 2007
    Location
    Metro St. Louis
    Posts
    181
    Quote Originally Posted by gary_g View Post
    Wrong (sorry). So a 14 SEER only produces 14,000 btu/hour? That would be a little more than 1 ton.
    Gary - I think you misread what he said. It was per kilowatt hour.

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