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  1. #1
    Elite Member czechsonofagun's Avatar
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    Jun 2006
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    Old Dominion
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    Kubota B1750

    Default HVAC wiring and breakers

    I am reading up on my future project and here is a question on wires. This is what I can understand from resources I found:

    Air handler - 240V, double breaker - provides power to the blower and circuit boards (2+1 romex, based on the current, #10 should be enough)

    Emergency heat strip - 240V, double breaker - separate wire and breaker - provides power to the heating element (2+1 romex, sized by the heating element, #6 for 10KW)

    Heat pump - 240 V, double breaker - provides power to the whole heat pump (2+1 romex #8)


    The signal wiring (18gauge, 6 or more strand wire) goes from heat pump to air handler and from air handler to the thermostat.


    Do I understand it correctly? Or is there a need for a 0 wire for the air handler? I have the space on my panel, but technically I could have a subpanel next to the air handler and distribute the power from there.
    Regards,

    Prokop


    I was put on Earth to accomplish a certain number of things. Now I'm so far behind, I'll never die!

  2. #2
    Elite Member tallyho8's Avatar
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    Aug 2004
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    3,320
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    Katrinaville LA west of Westwego east of Ama south of River Ridge north of Boutte, above sea level
    Tractor
    Yanmar 1802, Kubota L4400

    Default Re: HVAC wiring and breakers

    Different political entities have different electrical codes. Down here, 3+1 romex is required for 240 volts. I do not know what you mean by 0 wire.
    Happy Trails!
    Dudley

  3. #3
    Elite Member czechsonofagun's Avatar
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    Old Dominion
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    Kubota B1750

    Default Re: HVAC wiring and breakers

    Oops. that's czechism. We call minus wire 0 - say in electrical outlet you have the phase (+) and 0 (-). Sorry

    Anyway, up here we distinguish 240V with and without negative - water heater is connected by 2+1 (two power wires and ground) but electrical stove has 3+1 (two power wires, negative and ground - since it needs 120V for the display and owen lights)
    Regards,

    Prokop


    I was put on Earth to accomplish a certain number of things. Now I'm so far behind, I'll never die!

  4. #4
    Super Star Member murphy1244's Avatar
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    Nov 2011
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    Ohio
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    Kioti DK-40, MF-135, Ventrac 4500Y

    Default Re: HVAC wiring and breakers

    Whats the amp draw?
    Murph ------------

  5. #5
    Elite Member buckeyefarmer's Avatar
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    Jun 2005
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    MD
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    Kubota L3940 L5030 MF205-4

    Default Re: HVAC wiring and breakers

    Normally if it says 240V, it's 2w+gnd. 240/120V is 3w+gnd. Put in what the manual for the AH says. The 3rd wire is neutral, not a negative.
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