Re: Gas stops flowing when I release the knob after...
Before you go changing parts, clean up the pilot assembly. When you heat metal and let it cool and heat it again it causes it to corrode. Also for some reason these areas seem to attract little spiders who make their homes here. This causes gas flow problems which in turn could affect the size and direction the pilot flame. For if it does not touch the thermocouple, thermopile or whatever that little thingy is called that tells the gas valve to allow the gas to flow...it will not tell the gas valvle to let it flow. Remove the corrosion, spiders, spider webs and any other insects then sand the thermocouple, thermopile or whatever that little thingy is with a rough sandpaper to remove corrosion. It will likely work after that.
I maintain six similar heaters for a restaurant in Charlotte, NC. Rust and bugs seems to be what gets them every time.
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Re: Gas stops flowing when I release the knob after...
John Rodgers1, I have no respect for some wanna be tech telling a customer that I was wrong on a solution!!! You don't put other techs down!! Its wrong. If you go back and read my partial solution, you will find I said the thermopile Generator And or thermocouple is what keeps the pilot lite. You can check either with a meter to check the milivolts. So in the future, keep your smart *** comments to yourself. Have more respect for your fellow techs. If you feel they are wrong, say you don't agree. Shastalaker7
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Turn the gas knob to the pilot setting, press it in and hold it. You should hear gas escaping while in this position. Do not let more than about 10 seconds of gas out at one time as it may pool. Light the pilot while holding the gas knob down for a minute. Release the gas knob (the pilot flame should stay lit) and turn it to the ON position. To make sure the gas heater is working properly, turn up the thermostat and see if the heater heats up. How To Light The Pilot Light On Gas Heater
Is the ignition sparking? When you press and hold down the buttons, the ignition should be sparking at the centre electrode. At the same time when you hold the buttons down, the gas valve is manually held open to release the gas. The spark is then supposed to ignite the gas. Hold the knobs down for about 3 to 5 seconds after ignition and the gas valve will stay on. If it lights but the flame wont stay on, it could be anything from a partially blocked aeration port to a worn knob. When you push down on the knob, it is supposed to press down on an electromagnetic lock which keeps the gas valve open when the flame is burning. When the knob or shaft isn't pushing down enough, it doesn't keep the gas valve locked and the flame will go out as soon as you let the knob go.
First locate where to light pilot. You can do this by following thin aluminum colored tubing from control valve to inside heater.In general on top of your gas control valve is a knob. Turn indicator of this knob to pilot and depress knob. This will start gas flow to pilot at end of thin tube. Hold this knob in the depressed position and light pilot. DO NOT release knob for 30 -45 seconds. Then release knob and pilot will remain lit. Then turn knob to on position. If pilot will not stay lit you may need a new thermo coupler, which senses heat from flame to keep pilot gas flow open.
This sounds like a bad thermocouple, what this does is sense flame by heat. You can try to clean it with steel wool and make sure it is tight where it goes to the gas valve. Make sure it is on the top center pert of the flame as this is the hottest part of the flame. If cleaning does not work replacing it will.
sounds like you need to replace the thermocouple. this part is heated by the pilot flame and it sends a low voltage flame to the gas valve to open the main gas flow valve. they are very easy to install and they are located next to the pilot burner and screw into the gas valve.
First, turn off the gas valve for at least 5 min and ventilate the room. Most wall heaters are lit the same as a water heater. Find a red button to push or turn the gas valve knob to the pilot position. While pressing the red button or the gas valve knob, hold a match to light the pilot flame. After it lights continue holding the knob for one or two minutes. If the flame goes out when you release the knob the thermocouple is probably bad.
Once sufficient refrigeration has been obtained in the cooling tank at the MAX position, the control knob should be turned to the MIN position by low outside temperatures or when the refrigerator is only lightly loaded respectively the ambient temperature is below +18c in order to avoid over freezing the contents.
On top of the gas valve you will see a knob. Turn the knob to the position that says pilot. It's on the side of valve. Press the knob down with one hand and take your long lighter stick it by the pilot tube looks like a small aluminum tube should light pretty quickly hold for 30 seconds release the button you have been holding down. Now turn the knob to the on position. Make sure the thermostat is turned off so the flame don't fire up as soon as you turn knob. If you are uncomfortable gas your gas company and they should come out for free.