Commercial dean fryer replaced the gas valve with a honeywell 8071604 and the thermopile #205T102 when releasing the pilot everything goes out. can you solve this. have a diagram of the correct posistioning? thank you.
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If the pilot won't light, the first thing to try is to replace the thermopile, assuming you have a good flame on the top portion of the thermopile in the first place when you hold the gas valve in when in the pilot position. If this does not solve the problem, which in 90% of the cases it will, the gas valve is defective. I usually replace the thermopile when replacing the gas valve and save the old one for a backup.
Make sure that the thermopile is receiving enough heat from the pilot and if it does, check if the hi limit is good, check and tighten also all of the wiring connections, before replacing the gas valve.
This symptom indicates something wrong with the millivolt system. Start by checking the wires from the thermopile to the gas valve, insuring they are all tight and in place. Check the hi limit thermostat, if you have an ohm meter it should read .1 or .2 across it. With you meter set to dc millivolts, and flame present on the pilot, read across the thermocouple wires (red and white) to see the millivolts generated, with the thermostat off and the gas valve in pilot position you should get approx 600 millivolt plus minus 50. The pilot will have to be on for a minute or so to get maximum millivolts. If the millivolts are correct, hi-limit closed, and all wiring is connected, you likely have a faulty gas valve. If the hi limit reads more than .1 or .2 replace the limit, if you are not getting the millivolts from the thermopile, replace it.
If the pilot flame does not hold after releasing the button for at least 20 to 30 seconds, try to clean the thermopile and tighten all wiring connection on gas valve, thermostat and hi limit the repeat the process. The thermopile must be heated by pilot flame in order for it to generate small amount of voltage to open the pilot valve. If this does not correct the problem, try replacing the thermopile.
Check if the the gas pressure is sufficient (as stated on unit's nameplate). Check if the hi limit device is good. Check also if the thermopile (cylindrical metal with two wires standing behind the pilot hood) is receiving enough heat from the pilot flame. The voltage generated by thermopile should be 500millivolts in order to open pilot and main valve. If there is 500millivolt on gas valve thermopile and the pilot flame does not stay lit, you have to replace the gas valve. If the thermopile is glowing red and the voltage generated does not reach 500 millivots, you have to replace the thermopile.
Hello there: The problem you mention is not that clear. The pilot won't light or the pilot lighted but won't stay on is two different problems. If the pilot won't even light or no gas coming out off the pilot when you push down the pilot button it means the pilot orfice is blocked and what it need is cleaning the pilot orfice. If the pilot light is on but goes off when you release the button then the thermopile need to be changed. Hope this can help.
You can not check a thermocouple by resistence. You have to check it by millivoltage when it is hot and sensing it should be above 500mv. I would be willing to bet that you have some type of particulate in the gas valve that is causing this problem.