![]() ![]() If the oil burner flame is not present the cell passes that information on to the cad cell relay switch which will, after a delay of 15-20 seconds, shut down the oil burner. The cadmium cell is simply a type of photo cell that is mounted in the oil burner tube, usually near the rear, where it can "see" the flame when the oil burner is operating properly. You cannot see this part unless the oil burner is disassembled. Just below is a photo of what the cad cell itself looks like. ![]() ![]() This device is likely to be found on oil burners less tan 15 years old,Īnd on both hot air furnaces and hot water boiler heating systems provided that they are heated by an oil burner. ![]() Relay for use on (typical) intermittent ignition oil burner equipment. Our photograph shows a modern Honeywell(R) R8184G 4009 cad cell Oil burner (or inside the furnace or boiler's combustion chamber). The cad cell causes the relay to switch the oil burner off when a flame is not established during oil-burner startup ("trial for ignition or TFI" in some manuals) or if oil burner flame is later lost at the Is wired (often by a yellow wire) to the cad cell relay switch (see photo) which is usually a gray box with a red "reset" button located on top of or alongside The cad cell itself, that is the little cell that "sees" the oil burner flame, Presence of flame and thus to assure that the oil burner assembly stops pumping oil into the combustion chamber if flame ignition is Sensor, usually located inside the oil burner tube, to "see" the Guide to Oil Burner Cad Cell Relay Controlsįlame sensing devices on oil-fired heating appliances: modern oil-fired heating furnaces, boilers, and water heaters use a Cadmium Cell We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We include cad cell trouble spots - particular oil burner installations or conditions that can make it hard for the cad cell to sense even a good flame. We explain how the cad cell works to "see" the oil burner flame, what goes wrong in an oil burner that the cad cell "eye" can detect, and how cad cell sensors are tested using several methods including a VOM. We describe how the cad cell relay and the cad cell sensor itself are tested. We provide : a guide to inspecting and re-setting the cad cell relay safety device on oil burners. This article explains the operation, use, and reset button on Cad Cell Relay Controls. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest. ![]()
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