Intertherm Nat-LP conversion

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Old 11-29-07, 04:50 AM
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Intertherm Nat-LP conversion

I have an Intertherm furnace that I would like to convert to propane.There is an orifice supplied to convert to LP. But the thats is it. The envelope supplied only has 1 orifice. The instructions on the furnace doesn't refer to any other orifices (except that one) needing to be replaced.The only other thing the instructions refer to is the pressure spring that needs to be reversed and the pressure settings. Anyone familiar with these furnaces???

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Model# mmha-070aahr-05
serial# mmh9701-00989
 
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Old 11-29-07, 03:38 PM
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The orifice on the burner is the one that gets replaced and somewhere on the gas valve there's a cap (some are slotted, some use a 7/16 wrench) that gets flipped over.

Those are the only things required to convert these furnaces.

Note, as it's not hard to convert these, if not done properly could be dangerous. If you don't know what your are doing, it's something best left up to a professional.
 
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Old 11-29-07, 06:29 PM
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Conversion

hankhill is absolutely right. As a minimum, gas pressure needs to be checked.
 
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