Originally Posted By: Robert L Dean
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A lot of gas furnace manufacturers have developed conversion kits for their line of gas furnaces.I have dealt with a few in particular, but I have found it to be a simple matter of orifices when it comes to the differences in them. Each manufacturer has their own type of orifice replacement kit to convert from lp gas to propane or vice versa.
The kits contain the orifices and a spring.The spring is replaced in the gas valve. The way to tell if the system has been converted is the type of gas service piping that is run to the furnace. Generally for propane or LP gas, you would have cast iron piping, and special LP gas and propane fittings. Many natural gas service lines are made of flexible insulated piping.LP gas alone should never be used in a gas furnace that is set up for natural gas because the orifice will be too large, and can cause dangerous overfiring.
I would always inspect the gas lines going into a furnace, to make sure there are no leaks.Bubbles work great for this.Expensive testers may pick up residue from the combustion chamber. This would give false readings.
Also inspect the evenness of the flame when the gas furnace is fired up.This is to ensure the device is working properly.An uneven flame can be a sign of a problem.
Later,I may talk about testing heat exchangers for leaks.Digest this for now.Hope you enjoy.
Robert L Dean