Furnace change over. Nat'l Gas to Propane Question

Discussion in 'HVAC' started by Jerry Anderson, Dec 31, 2004.

  1. I have a older Sears natural gas home furnace that I'm not using because
    I changed it out for a more efficient one and thought it would be good
    to give it to my brother-in-law to heat his garage with. It is 100,000
    btu and would make short work to bring up the temperature in his garage
    so he could get out of the house and do some tinkering jobs out there.
    My question is this. The furnace that I have is as I said natural gas
    and all my brother-in-law has is propane as he lives in out of town. We
    thought it could be changed over to propane by changing the orifices in
    all 6 burners but is the same control OK to keep or do we need a control
    that is for propane. Are controls for natural gas and propane the same?
    Also, how do we calculate what size orifices we need? Is the orifice
    for propane bigger or smaller than for natural gas? Thanks to anybody
    who answers with some help. Jerry
    Jerry Anderson, Dec 31, 2004
    #1
  2. On Thu, 30 Dec 2004 20:53:28 -0500, (Jerry Anderson)
    wrote:

    >I have a older Sears natural gas home furnace that I'm not using because


    Post in alt.home.repair, not here.


    >I changed it out for a more efficient one and thought it would be good
    >to give it to my brother-in-law to heat his garage with. It is 100,000
    >btu and would make short work to bring up the temperature in his garage
    >so he could get out of the house and do some tinkering jobs out there.
    >My question is this. The furnace that I have is as I said natural gas
    >and all my brother-in-law has is propane as he lives in out of town. We
    >thought it could be changed over to propane by changing the orifices in
    >all 6 burners but is the same control OK to keep or do we need a control
    >that is for propane. Are controls for natural gas and propane the same?
    >Also, how do we calculate what size orifices we need? Is the orifice
    >for propane bigger or smaller than for natural gas? Thanks to anybody
    >who answers with some help. Jerry



    Paul ( pjm @ pobox . com ) - remove spaces to email me
    'Some days, it's just not worth chewing through the restraints.'

    HVAC/R program for Palm PDA's
    Free demo now available online http://pmilligan.net/palm/
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    pjm@see_my_sig_for_address.com, Dec 31, 2004
    #2
  3. Jerry Anderson

    Noon-Air Guest

    "Jerry Anderson" <> wrote in message news:...
    I have a older Sears natural gas home furnace that I'm not using because
    I changed it out for a more efficient one and thought it would be good
    to give it to my brother-in-law to heat his garage with. It is 100,000
    btu and would make short work to bring up the temperature in his garage
    so he could get out of the house and do some tinkering jobs out there.
    My question is this. The furnace that I have is as I said natural gas
    and all my brother-in-law has is propane as he lives in out of town. We
    thought it could be changed over to propane by changing the orifices in
    all 6 burners but is the same control OK to keep or do we need a control
    that is for propane. Are controls for natural gas and propane the same?
    Also, how do we calculate what size orifices we need? Is the orifice
    for propane bigger or smaller than for natural gas? Thanks to anybody
    who answers with some help. Jerry

    NEWS FLASH!!!
    Garage explodes from improperly installed gas furnace!!!
    (Film at 11:00)
    Noon-Air, Dec 31, 2004
    #3
  4. Jerry Anderson

    TURTLE Guest

    "Jerry Anderson" <> wrote in message news:...
    I have a older Sears natural gas home furnace that I'm not using because
    I changed it out for a more efficient one and thought it would be good
    to give it to my brother-in-law to heat his garage with. It is 100,000
    btu and would make short work to bring up the temperature in his garage
    so he could get out of the house and do some tinkering jobs out there.
    My question is this. The furnace that I have is as I said natural gas
    and all my brother-in-law has is propane as he lives in out of town. We
    thought it could be changed over to propane by changing the orifices in
    all 6 burners but is the same control OK to keep or do we need a control
    that is for propane. Are controls for natural gas and propane the same?
    Also, how do we calculate what size orifices we need? Is the orifice
    for propane bigger or smaller than for natural gas? Thanks to anybody
    who answers with some help. Jerry




    ------------------------------------------------------------------------------

    This is Turtle.

    1) It is very rare to see a 100K BTU furnace natural gas or propane with 6 burners. Most 6 burners are 150K BTU furnaces.

    2) You need to post over at alt.home.repair and a bunch of people here will be happy to reply to you there. We try to get the homeowners to post over there for do it yourself deals.

    TURTLE
    TURTLE, Dec 31, 2004
    #4
  5. Jerry Anderson

    Oscar_Lives Guest

    "Jerry Anderson" <> wrote in message news:...
    I have a older Sears natural gas home furnace that I'm not using because
    I changed it out for a more efficient one and thought it would be good
    to give it to my brother-in-law to heat his garage with. It is 100,000
    btu and would make short work to bring up the temperature in his garage
    so he could get out of the house and do some tinkering jobs out there.
    My question is this. The furnace that I have is as I said natural gas
    and all my brother-in-law has is propane as he lives in out of town. We
    thought it could be changed over to propane by changing the orifices in
    all 6 burners but is the same control OK to keep or do we need a control
    that is for propane. Are controls for natural gas and propane the same?
    Also, how do we calculate what size orifices we need? Is the orifice
    for propane bigger or smaller than for natural gas? Thanks to anybody
    who answers with some help. Jerry




    ------------------------------------------------------------------------------





    Just keep tinkering with it. You'll figure it out soon enough.
    Oscar_Lives, Jan 1, 2005
    #5
  6. Jerry Anderson

    Me Guest

    On Thu, 30 Dec 2004 20:13:42 -0600, "Noon-Air" <>
    wrote:

    >
    > "Jerry Anderson" <> wrote in message news:...
    > I have a older Sears natural gas home furnace that I'm not using because
    > I changed it out for a more efficient one and thought it would be good
    > to give it to my brother-in-law to heat his garage with. It is 100,000
    > btu and would make short work to bring up the temperature in his garage
    > so he could get out of the house and do some tinkering jobs out there.
    > My question is this. The furnace that I have is as I said natural gas
    > and all my brother-in-law has is propane as he lives in out of town. We
    > thought it could be changed over to propane by changing the orifices in
    > all 6 burners but is the same control OK to keep or do we need a control
    > that is for propane.

    You have to change out the gas valve too with one capable of use with
    propane.
    > Also, how do we calculate what size orifices we need? Is the orifice
    > for propane bigger or smaller than for natural gas?

    Smaller. Check with the original manufacturer for the correct
    orifices. The information should be in your OEM manual.
    JERRY...
    ---->> My best advise is to have a competent service technician do the
    work though. There are so many variables you might miss and this could
    lead to disaster. Natural and LP Gas isn't something to tinker with.
    Please take my advise on this so your family can have you around for a
    while longer.
    > Thanks to anybody
    > who answers with some help. Jerry
    Me, Jan 2, 2005
    #6

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