2007-10-26 05:40:42 · 7 answers · asked by Anonymous in Home & Garden ➔ Maintenance & Repairs
different pressures,in the two.
2007-10-26 05:55:28 · answer #1 · answered by tom the plumber 3 · 0⤊ 0⤋
Because the holes are smaller in the orifices. If you can find someone with a set of orifice drill bits then you can remove the orifices and drill them all out 10 drill bit sizes bigger.What I do is first measure the size of the orifice and then enlarge it 10 sizes bigger. So if I wanted a size 52 to be correctly drilled I would go with a size 42 bit. I have resized many of these at $5 bucks a piece. In drill bit sizes the larger the number the smaller the size. Notice I keep saying orifices in the plural,Yes not only the pilot will need to be changed, you also will need to do all the burner orifices,for instance you have four burners, you need to resize four orifices and one pilot orifice. Confused yet? It gets even more complicated.You will need to convert the gas valve itself to a natural gas valve. You will need to remove the pressure plate on top of the valve and replace it with a natural gas pressure plate on the gas valve itself. Then the individual appliance gas regulator(that thng that the gas hooks to) will also need to be converted over to natural from LP. It has a cap you flip over on top of it,one side marked NAT the other LP nat needs to be showing. Propane gas is under a lot more pressure than natural gas it. Propane has a water columm rating of 10 while natural gas is rated at 3.5. As if all that were not enough the final adjustment will be needed to fine tune the heater so it will work right. The pilot will need to be reset turning the piolt screw which is under a BIG flathead screw located on top of the gas valve. Did I mention the pressure tap located on the valve? This is used to determine if the correct amount of pressure is going into the valve. Using the guage below (old school) sorry I am old! They have digital but hey I am old school.Anyway this is used to test the pressure going to the valve itself,so that adjustments can be made to the system for good clean burning blue flame.
2007-10-26 17:00:39 · answer #2 · answered by Anonymous · 1⤊ 0⤋
The holes on an LP orifice are smaller. If you lit the furnace with natural gas and the LP orifice, it would sound like a jet taking off and the flames would look like they are "spraying".
2007-10-26 13:59:53 · answer #3 · answered by sensible_man 7 · 0⤊ 0⤋
The two gases are completely different in character, natural is lighter than air, while LP is heavier than air.
Their calorific values are different, in fact butane is more califoric than propane as an example.
One cubic foot of natural gas has certain calorific value while the same amount of LP has a different amount.
An analogy is a can of condensed soup versus a can of normal soup.
2007-10-26 12:57:16 · answer #4 · answered by xenon 6 · 0⤊ 0⤋
Different gas density and pressure. You may also need to set the gas valve to the proper gas pressure besides changing the orfice.
2007-10-28 12:41:40 · answer #5 · answered by John himself 6 · 0⤊ 0⤋
YES. For more about furnaces check out www.hvac-for-beginners.com
2007-10-26 12:56:00 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Sensible is correct.
2007-10-27 08:00:55 · answer #7 · answered by Anonymous · 0⤊ 0⤋