How can I adjust the size of the pilot on my Williams gas wall heater? The are the words "Pilot adjustment" stamped on the exchange block but no screw only a little round blue plastic insert with a pin hole sized opening in it. Maybe the flame is at what it should be but it seems too high to me. In the dark you can see small amounts of yellow flame along with the blue. The heater has two burners one for each side. It heats two rooms. The pilot burns in a Y-shape in order to feed both sides.
The insert sounds like the cap covering the adjustment screw. Pin hole is for cap removal. Wondering why flame is so high?! Shouldn't have orange flame. If heater doesn't light with lower flame... thermocouple (thing that the flame heats up) may be bad.
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www.manualslib.com > Brands > Williams Manuals > Furnace > 2509622
2509622; 2539622; 2559622; 3509622; 3539622; 3559622; ... WHAT TO DO IF YOU SMELL GAS: ... Williams furnace co. direct-vent wall furnace owner's manual (24 pages) ... Caring for Your Furnace ............24-25 Locating Wall Furnace and Thermostat ........6-7 Learn how to keep your new Williams Furnace operating.
take the pilot line loose from the gas valve with a 7/16 wrench and blow air with a compressor through the tubing.then re-attach the pilot line USING YOUR FINGERS FIRST then snug it up.soap test it for leaks looking for bubbles.the pilot should be clean now.if not do it again.
The pilot gas pressure should have been preset at the factory. If an adjustment was needed at the time of the installation (or after the replacement of the gas valve if it was ever replaced) the installer should have set it. Assuming all of this was set proper at one time you probably only have a dirty pilot assembly. The assembly should be removed and cleaned thoroughly. The pilot orifice inside the assembly is probably restricted with dirt.
With propane, the hole should be tiny. The manufacturers instructions would say what size according to your elevation and BTUs. But, in order to get more flow, I use a small sewing needle to ream out the hole, very very carefully twisting and pushing. I grip the needle with small vice grips. Take care not to break the needle inside. Increasing the size of the hole just a tiny bit will dramatically increase the pilot flame size. Before you do all that though, try pressurized air, just cleaning the pilot tube and the orifice could be all you need.
Lets start with safety. Check your vent pipe for obstructions, mainly outside at the vent cap. The safety of this unit will not allow it to operate if there is anything blocking the vent. If all is OK, then next we will light and observe the pilot with it on the pilot setting on gas valve. The pilot flame should consume the tip of the generator point by 1/2 to 5/8". If it does not, then screw off the pilot adjust screw cover on the gas valve. This is clearly marked on the top of the valve. Inside you will have a much smaller screw. Turn it counter clockwise to raise the pilot level, clockwise to decrease. Never consume more than 5/8" of the generator tip. Hopefully your problem will be resolved here at this step. If however it is OK, then take a millivolt meter and read the generator millivolts, at the gas valve with the thermostat contacts closed. It should read 140 millivolts. You need this much power to properly operate the heater. If it is lower than 140, then replace the pilot generator....Rob
Just a note...Do not remove or take apart any part of the Gas valve, other than the pilot adjust screw cover...Good Luck.
Any pilot adjustment would be under a large screw with a flat blade slot in it. There would be a smalled flat blade screw under it. Warning: Too small of a flame and your safety device won't work. READ MORE