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Switching 240V 5KW garage heater

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Comments

  • SWEI
    SWEI Member Posts: 7,356
    ratio said:

    If that second schematic is the correct one, the plan to break both hots external to the heater will most likely cause problems. There's a fan switch that holds the fan on after the elements drop out to cool them off. If the fan drops out before the elements are cool enough, the high limit will trip.

    Hence my initial suggestion to put the SSR or relay inside the appliance. Adding a control point to the appliance is not a bad thing.
  • BobC
    BobC Member Posts: 5,501
    If you use a SSR make sure it's on a good heatsink.

    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
  • ChrisJ
    ChrisJ Member Posts: 16,287
    Here's what I've got so far.






    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

    KC_Jones
  • ChrisJ
    ChrisJ Member Posts: 16,287

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

  • ratio
    ratio Member Posts: 3,777
    Looks about right to me.

    Nice job on the enclosure too.

    ChrisJ
  • Harvey Ramer
    Harvey Ramer Member Posts: 2,261
    The heater should have a disconnect as well. Might as well incorporate that into the whole thing.
  • ChrisJ
    ChrisJ Member Posts: 16,287
    edited January 2016
    The finished product.





    Not bad for homemade in my opinion.
    @MarkS does much nicer work but it's reliable and more importantly it's safe.

    The funny part is it could in theory control two 11,000 watt heaters and it's only controlling a single 5000 watt one. :) I chose that contactor (40A DPST) because of price and dimensions.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

    njtommy
  • ratio
    ratio Member Posts: 3,777
    Better make sure the ground screw is green, otherwise it won't meet code... ;) It looks better than a lot of the stuff I've seen.
    ChrisJ
  • njtommy
    njtommy Member Posts: 1,105
    Nice looks good.

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