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I have an old Day and Night Furnace. Model # 100U36-19A. The thermostat kicks it on and the fan starts to run bu the burners fail to ignite. It does not have a thermocouple, it has a standing pilot light that remains lit, but will not fire. I replaced that part before about 10 years ago, but I cannot remember what the part is called - it's not a themocouple, but what is it?

Submitted: 53 days and 3 hours ago.
Category: HVAC
Value: $9
Status: AWAITING CUSTOMER ACTION
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Optional Information

Make : DAY and Night
Model : 100U36-19A

Already Tried:
I explained it previously. The burner will not fire on the furnace. Don't know if it is gas valve or ????? (what ever it is that it has that is not a thermocouple)

Posted by Billy 53 days and 3 hours ago.

Info Request

Hello, coming from the pilot assembly there is a aluminum pilot tube and a wire(s) or copper capillary tube. Do you know which you have that runs along side the 1/4" aluminum tube?

53 days and 3 hours ago.

Reply

There isn't a copper line. The aluminum line that appears to be about 5/16" runs to the pilot. The pilot has two heavily insulated wires coming from it up to the electrical area with the fan relays, etc. I can't remember what this pilot assembly is called since it does not have a thermocouple.

Posted by Billy 53 days and 3 hours ago.

Info Request

Powerpile generator ?

53 days and 3 hours ago.

Reply

No, this thing is incorporated into the pilot assembly, it almost looks like a piece of ceramic on the back side of the pilot. THe one wire comes from the transformer to a switch with a dial on it, then down to the "thermopile" maybe? then back to the gas valve. I think that is the right name for the unit now - "Thermopile" - could that be it?

Posted by Billy 53 days and 3 hours ago.

Info Request

Yes, does it look like this.

 

http://americanhvacparts.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=PIL1820019&Category_Code=

53 days and 3 hours ago.

Reply

That looks close, if I pull the existing out would it have a model number on it? Also would this cause the problems I am having?

Posted by Billy 53 days and 3 hours ago.

Answer

yes it would. it is either the thermopile or gas valve. To test you would need to see if it read at least 750 millivolts at the 2 ends

53 days and 3 hours ago.

Reply

What is life expectancy on thermopiles? I believe I changed this same part about 10 years ago. Should I keep one on hand?

Posted by Billy 53 days and 3 hours ago.

Answer

actually 10 years is good. I wish all my stuff lasted that long! And yes, this is apart that would be wise to keep one on hand

53 days and 3 hours ago.

Reply

One last question. Who do you recommend online to purchase this part? I live in the backwoods of Wyoming and don't have a lot of choices locally.

Accepted Answer

http://www.pexsupply.com/Honeywell-Q313A1139-Thermopile-Generator-1743000-p

 

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Expert: Billy
Pos. Feedback: 99.7 %
Accepts: 
Answered: 9/30/2009

HVAC Mechanic

State Licensed Mechanical Contractor, Heating, Cooling, Oil Burners, Heat Pumps, Boilers, Geothermal

53 days and 3 hours ago.

Reply

Thats kind of what I thought, that is who I use for my water parts at work. Thanks

Posted by Billy 53 days and 3 hours ago.

Info Request

you are very welcome and I thank you.

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