At this point, we know for sure that the gas supply isn't right.
Until the gas supply is done correctly, I don't think that it makes much sense to start chasing down heater defects.
The orifice kit part number for the 250,000 btu/hr propane is 460740.
The brass orifice is stamped with two letters to indicate the btu/hr rating and the type of gas.
The type of gas is either N for natural or L for liquid propane.
I think the correct letters for the 250,000 btu/hr propane heater are "S L".
Until the gas supply is done correctly, I don't think that it makes much sense to start chasing down heater defects.
The orifice kit part number for the 250,000 btu/hr propane is 460740.
The brass orifice is stamped with two letters to indicate the btu/hr rating and the type of gas.
The type of gas is either N for natural or L for liquid propane.
I think the correct letters for the 250,000 btu/hr propane heater are "S L".