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Thread: New Baseboard Heater install

  1. #1
    DIY Junior Member 98ZJUSMC's Avatar
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    Default New Baseboard Heater install

    Hey!

    This is more an electrical issue so, I'll post it here. I am installing a 240V 500 Watt Cadet baseboard heater in a bedroom I am remodeling. I ran the NMB from a single pole 20A double breaker (more on that in a minute) to a receptacle box on the wall of the bedroom where the thermostat will go, then to the heater. I wired the thermostat box direct just to make sure the heater is working. I get power on both legs at the thermostat box and at the heater itself. It's not working at all. No heat, whatsoever.

    I realize that I need to install a double pole breaker for the final install so both legs will trip together. The single pole is just a temporary to make sure there are no problems along the run.

    My assumption is the heater is bad. Anyone see any other problem? I ran my Fluke Voltage Detector down the heater element of the heater and it tweeted very intermittently. I assumed it would tweet constantly. All connections have been checked and double checked.

    Thanks!

  2. #2
    Homeowner Thatguy's Avatar
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    The 500 W heater should read (240^2)/500 = 115 ohms.
    Last edited by Thatguy; 11-29-2010 at 12:13 PM.

  3. #3
    DIY Junior Member 98ZJUSMC's Avatar
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    Oh. I didn't check continuity. Where can i check that at the two power leads?

    It's definitely 500W

  4. #4
    Electrical Contractor Jim Port's Avatar
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    Can you describe the breaker again? A single pole double breaker does not make sense.

    What connections did you make at the heater?

  5. #5
    DIY Junior Member 98ZJUSMC's Avatar
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    I used a 20A 2-circuit circuit breaker. There is only one buss bar clip.

  6. #6
    Nuclear Engineer nukeman's Avatar
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    Sounds like that is the problem (assuming it is a tandum type breaker). Single breakers normally grab onto one buss bar. In order to get 220/240V, you need to be connected to both bars. A normal breaker for this situation will grab onto both bars.

    Assuming that you have not checked the total voltage (red to black), what you are getting is 110v on each leg, but the legs are the same phase, so the actual voltage that the heater is seeing is 0v.

    Get the right breaker, and you should be in business. If it still doesn't work, check voltage at the t-stat and heater and then get the ohms on the heater itself (power OFF).

  7. #7
    DIY Junior Member 98ZJUSMC's Avatar
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    Ahhhhh..... Thank you nukeman. I read this about the voltage somewhere else, but couldn't get an explanation. Or at least one I could understand. I thought.....well, I thought wrong.

    I'll go ahead and do that. I have an empty breaker above the tandem in the breaker box. I'll hook one leg up to it and simulate the two legs for test purposes.

  8. #8
    DIY Junior Member 98ZJUSMC's Avatar
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    Thanks nukeman. Hooked it up that way and she be heatin'!

    Off I go to the Depot!

  9. #9
    Nuclear Engineer nukeman's Avatar
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    Good deal. Glad to hear that it is now working.

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