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The smallest pilot orifice is used for LP. Make sure you read the instructions thoroughly. Usually the gas valve pressure regulator is disabled and the burner orifices are also changed. Good luck and hope this helps.
Hotpoint supplies the orifices and instructions with each range for converting. It is just that it is hidden, they attach it to the gas regulator. The regulator is near the bottom back typically. Here is a cut out from your use and care manual.
CONVERTING TO LP GAS (or converting back to natural gas from LP) This range leaves the factory set for use with natural gas. If you want to convert to LP gas, the conversion must be performed by a qualified LP gas installer. The conversion instructions and LP orifices can be found attached to the range next to the pressure regulator. Keep these instructions and the orifices in case you want to convert back to natural gas.
More and more, you have to change the gas valve AND the orifice due to the liability issue of changing only the orifice and not doing a complete conversion. If, and this might be a big if, a conversion kit is available, you will need the model # of your dryer to order it. The kit will come with a spring and a tension nut for the gas valve and the orifice you need. Instructions will come with the kit. Follow them to the letter. An improperly installed conversion kit, or just changing the orifice, can be very dangerous. LP operates at a higher pressure than the natural gas the dryer was built to use, and an improper conversion presents a significant fire hazard.
I am having almost the same problem. Frigidaire told me to replace all 5 mixing tubes, ~$385, yeah right. They don't have the orifices itemized as an individual part, so no-one carries them, just the LP conversion kit. Another repair/parts guy advised me to drill out the orifices. Some other threads/blogs give the diameter to drill. Basically, since natural gas is 0.5 psi, you need a larger hole than your current propane orifices provide. Please speak up if you find out anything, I will try to do the same. Good luck.
You posted under a combo washer / dryer WD-4343RHD.
For a gas dryer, conversion is to replace Nat gas orifice with LP one (the LP orifice has a air hole going cross ways through it) plus screwing the regulator blocker (brass slot head screw on top of the gas valve) all the way down (if you missed that step, I would expect your symptoms). Also, make sure you have a good vent with strong air flow at the outdoor outlet. If poor vent, short cycling may occur.
This is the solution to convert from LP back to natural gas that I posted as a comment on this thread: After much work and little help from Jenn-Air or Whirlpool, I found a satisfactory solution. As many of you may have found out, Whirlpool does not sell the natural gas orifices to the JDR8895AAS separately as they do the LP conversion orifices. Instead, they recommend that you buy all 5 orifice holders that include the individual orifices. This would run about $120-150 depending on where you shop. If you want to take this route, the Whirlpool parts you need are: 1x740079621x740078132x740079611x74007816 Fortunately, because natural gas is denser than LP, the LP orifices can be bored out for a conversion back to natural gas. After a lot of homework I was able to find someone with the natural gas orifices for this stove that let me take them out to measure them. For some crazy reason, Whirlpool does not have this information: Find a machine shop or a good appliance repair shop that has a wire gauging bit set. The natural gas orifice hole sizes are as follows: Left front burner (16K BTU): 48Left rear burner (9.2K BTU): 54Center burner (5K BTU): 58Right front burner (12.5K BTU): 52Right rear burnger (5K BTU): 58 It cost me $25 to have these resized after I found the correct hole size. Finally, to complete the conversion back to natural gas, you must flip the plastic screw-shaped piece by unscrewing the hex nut on the regulator at the back of the stove. Hope this helps, because it took me a while to figure it out.
In most cases the pressure regulator has to be changed or adjusted. The orfices on each burner, oven, broiler and surface burner may need to be changed also. Sometimes they can be adjusted. Sometimes the threads on the pipe are different also. This is to prevent accidental connection to the wrong fuel. The big difference is the gas pressure. LP is usually around 10 - 12 lbs and natural gas is usually around 3 lbs. Properly adjusted you will like natural gas much better than LP as it is slightly hotter. The information will be in the instruction book and also on the Jenn air web site. Whirlpool owns both Maytag and Jenn aire so check all sites. The conversion kit is usually less than $50.