How do i changa my wall direct vent heater from gas to propane.what does this in tail

SOURCE: Empire Wall Heater(propane) won't stay lit

John Mac here...the solution was that we had shut the pilot off for the summer, and birds had made a nest inside the heat exchanger...coming in through the direct vent. Cleaned out the nest, and it works perfectly. My technician recommends that I leave the pilot buring through the summer to prevent this in the future.

SOURCE: physical difference between natural & propane orfice

Merry Lynn, there will be no physical differences between Natural Gas heaters and Propane Gas heaters. Check the model number of the unit, it may have a N or P or LP printed at the end of it to distinguish which gas it uses. The plate that is attached to the heater should indicate the type of gas it uses.

DO NOT try to convert this heater to another gas.

SOURCE: B vent configuration of direct vent propane heaters

Yes, the design of the combustion chamber is limited at how much fresh air and combustion air can enter it. If you lengthen the venting, you will be causing more restriction and there will not be enough natural air movement to make it work. It will start, run for a minute or two and poof out. Not to mention you will be circumventing it's UL rating and if you sell your home with it installed, you are liable for any fatality or damage. Do you want to risk that? Don't even think of doing it! There are "Box" heaters out there sized from about 5,000 Btu's on up to 100,000 Btu's. Check the web.

SOURCE: propane heater has spark but wont light

ODS/Pilot may be clogged make sure you clean it out according to the instructions in your owner's manual. If you need a copy of the manual let me know and I will try to find it for you. If it is still not working it could be the gas regulator or the ignitor cable. For Glow warm parts contact Master Parts at 800-446-1446 or you also can find them online at www.masterparts.net. I hope this helps you!

SOURCE: Wires not connected to gas valve need wiring

I think you mean a milli-volt system. I went to the cozy heaters website and found the wiring diagram in an owners manual for a similar unit, a W355. I bet the wiring diagram will work for your.