Need help with Carrier Furnace and LP connection

Discussion in 'HVAC Heating & Cooling' started by dcorazal, Sep 15, 2011.

  1. dcorazal

    dcorazal New Member

    Jul 19, 2011
    I connected up the wiring from the thermostat and powered up the furnace. Taped interlock switch for the front panel. After studying the wiring diagram I realized that part of the LP conversion kit there is pressure switch added to the furnace so it won't turn on with no gas pressure. I connected up my 20lb gas tank to the furnace to see if it would start and it did.

    I only momentarily let the furnace run not knowing if the gas pressure from a 20 lb gas tank would have enough gas pressure (or to little) to fire the furnace.

    Question: For testing purposes-- can I run the furnace on a 20lb tank? Should I have a regulator on it?
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    I think (but am not sure) that you can or maybe already have damaged things in the furnace without having a pressure regulator in line. Now, the furnace itself may have a secondary one and you may be lucky. Typically, there's a regulator on the LP tank before it feeds anything. WIth a bare 20# tank, that is missing.
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