Is the pilot flame hitting the thermocouple? If yes... and it is tightened "snug"...check high limit. Bypass by connecting wires that go to it. If operation is normal then replace high limit (before using fryer)
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Re: Pilot will not stay lit on Imperial IFS75
I work with these vats in my business and it has been common in my experience that the pilot area needs to be cleaned. Take a paper clip or the like and clean the pilot area where the gas comes in. Make sure your gas line is not crimped. If you are handy, you may can take apart the orifice itself and clean it. Usually, I would say replace the thermopile. Make sure it is set close enough to the pilot so that it can heat up well enough to call for the gas.
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You could have a weak pilot or thermopile. If the thermopile is not heated correctly by the pilot, it cannot generate enough millivolts to open the gas valve. The same is true if the thermopile is faulty. Thermopiles consist of several junctions of which only some may go bad causing low millivolt output. Millivolt output with the thermostat off and pilot lit should be around 600 millivolt, you can check with a DC multimeter set on MV across the two wires coming from the thermopile. Remember, the thermopile has to be heated by the pilot thoroughly before you will get the full millivolt reading and the thermostat must be off. Cleaning the pilot assembly is often helpful, thermopiles are inexpensive and relatively easy to change. Of course, other problems can cause this issue as well, but the above are most common.
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.
You will be needing a dc voltmeter set at millivolt to test a thermopile.
measure the voltage across the termials of the thermopile when it is heated by the pilot flame, you should have 600 to 750 millivolt reading.
If the reading is less than 600, try cleaning it with non metal scrubbing pad and/ or try increaing the pilot flame or you have to replace it with a new one. Try the same with your other fryers with thermopile.
You will be able to find parts at http://www.imperialrange.com
Probably the thermopile is not receiving enough heat from the pilot flame to generate 500 to 750 millivolt to hold pilot flame. The thermopile may have soot or dirt on it so try to clean or the pilot flame itself does not give enough heat, try adjusting pilot flame. Or the thermopile could not generate the right amount of millivolt even if it is clean and receiving enough heat from pilot flame, so better replace the thermopile.
Check also the hi limit, it must have continuity across its terminal.
Check if there is 500 to 750 millivolts across the thermopile wires; thermopile generates 500 to 750 millivolts if properly heated to energize pilot and main valve solenoids of the gas valve for pilot and main burner operation. If the voltage across the thermopile is good and all wiring connections are ok, I think you have to replace the gas valve. Regards.
You have to check the following: 1. Does the pilot flame has the ability to heat up the thermopile? Themopile must be properly heated in order to generate voltage to open the pilot valve as well as main valve. 2. When the thermolpile is heated, does it generates 500 millivolts? If not, your thermopile needs replacement. If it does and still the pilot flame wont stay lit, your gas valve needs replacement. 3. Does the hi limit device has continuity on its terminals? If there is no continuity on hi limit terminals, you have to replace it. One of the thermopile wire passes on this hi limit terminal to cut the voltage supply on pilot valve in case the oil temperature reaches 450F. 4. Check and tighten all wiring connections, millivolts generated by thermopile will not pass on loosely terminated wiring.
You must first check to see if your pilot flame is good. If it is too weak, or not impinging properly on the thermopile, it will not stay lit. If the pilot flame is ok, the problem could be that the thermopile is weak. using a millivolt meter, test the voltage across the thermopile while the pilot is lit (you may need someone to hold the button down while you do this). You will also need to disconnect the thermopile's leads from the control while you do this. You should get about 750 millivolts across the thermopile while the flame is on it (let it heat for a while to stabilize). If your reading is too low, your thermopile may be shot and needs to be replaced. That is of course only if your flame is proper. That voltage is needed (or close) to keep the magnet open so it will stay lit when you let the button go.
This problem could be caused by a few different things. You should check the condition of your pilot and the thermocouple, if the pilot is weak due to being dirty you will not generate the optimum Millivolts to run the fryer, you may need to dissassemble and clean the pilot. The thermocouple needs to be correctly placed in the pilot assembly, if it has dropped down to where it is not in the flame it will not work correctly. You may need a new thermopile as it may not be generating millivolts as needed. Gas pressure can cause this as well, if the pilot goes out then the main burners come on you should check the gas pressure. One more thing to check is the hi-limit thermostat, if this is cutting out early your pilot will go out. Imperial uses a self-resetting limit, after a few minutes your fryer will relight and work until if cuts out again. If your fryer pilot stay on with the thermostat off for long periods of time and does not go out immediately when the burners come on and the pilot is clean, you may need a hi limit. This is a lot of info, I hope it helps.