Question about Imperial IFS75 Deep Fryer

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Pilot will not stay lit on Imperial IFS75

Replaced 750 millivolt thermopile

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  • jtolbert Feb 16, 2009

    Thanks for the response and information. I did notice that the pilot flame seemed weak, so this is very helpful.I will try it out tomorrow. Thanks.

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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)

Posted on Feb 28, 2009

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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.

Posted on Feb 15, 2009

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1 Answer

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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.

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Hi there.
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.
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You will be able to find parts at http://www.imperialrange.com
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Hi there.
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.
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1 Answer

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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.
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