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Tool Talk Discussion Forum

oil furnace gun

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in sticks

11-09-2006 14:37:34




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in a oil fired furnace the ''gun'' has a '' cathode eye'' that looks at the flame in the furnace,no flame the ''eye'' shuts down gun. anybody ever have the ''eye'' go bad? ever test one out of furnace? how do you test?




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jdemaris

11-10-2006 15:08:49




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 Re: oil furnace gun in reply to in sticks, 11-09-2006 14:37:34  
If you have the "newer" cad-cell light senor, it's cheap and easy to replace. Often though, you just have to wipe it off. The old oil-burners didn't use the cad-cells - I still have an older unit heating my barn. It uses a stack-sensor instead.



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Lm

11-10-2006 04:08:34




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 Re: oil furnace gun in reply to in sticks, 11-09-2006 14:37:34  
If you can't get an suitable replacement sensor a light dependent resistor, LDR type ORP 12 should do.I have used them in some old/obscure burners where original spare parts were impossible to get. Usually available in any electronics hobby shop.



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in sticks

11-09-2006 17:47:11




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 Re: oil furnace gun in reply to in sticks, 11-09-2006 14:37:34  
thanks for help ,even though i had cad cell named wrong.again thanks



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Ohio Case

11-09-2006 15:17:18




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 Re: oil furnace gun in reply to in sticks, 11-09-2006 14:37:34  
An easy way to check one while it is in the furnace is to put a jumper wire between the 2 terminals on the primary control market F & F, ususally they have the yellow wires from the cad cell hooked to them. You need to be fairly quick about this because it will time out in 30 - 45 seconds after the burner lights. If the unit continues to run with the jumper on and the unit firing you know that the cell is bad. To check the cad cell itself take it out of the furnace hold it up to a bright light, (drop cord or trouble light). Hook a multimeter up to the leads, it should be at least 1600 ohms.

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Jay (ND)

11-09-2006 15:13:17




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 Re: oil furnace gun in reply to in sticks, 11-09-2006 14:37:34  
They go bad all the time - they are cheap.

How to check the honeywell models pdf file



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Jay (ND)

11-09-2006 15:16:22




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 Re: oil furnace gun in reply to Jay (ND), 11-09-2006 15:13:17  
Oh! And if this is the first time firing it up for the year, it's probably just a little corroded on the connections. Notorious in basements, especially damp ones.

TURN OFF THE FURNACE AT THE FUSE BOX

Most of these cad eyes simply plug in. Simply pull it straight off from it's base and put some dialectric grease on the probes and plug it back in.



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