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-   -   is this a thermocouple? (http://www.diychatroom.com/f17/thermocouple-159445/)

graffij1 10-08-2012 06:48 PM

is this a thermocouple?
 
1 Attachment(s)
Everything I've read about thermocouples are they are copper but I don't have copper in here. Its the pipe coming out of this valve right? Just for terrence I've got a heil nuge075bg01

Attachment 58551

md2lgyk 10-08-2012 06:51 PM

No. I see no thermocouple anywhere in that picture.

graffij1 10-08-2012 06:52 PM

Good thing I didn't take it off then. What would be the gray tube coming out if the valve?

graffij1 10-08-2012 06:54 PM

I'm having a hard getting pilot to keep reigniting. Would like to set thermostat to auto

danpik 10-08-2012 07:56 PM

I believe that gas valve is an intermitent pilot valve. The tube you see is the pilot supply tube. There should be a spark ignitor to light the pilot.

Doc Holliday 10-08-2012 07:59 PM

If you had one this is what it'd look like. It would not be by the gas valve where you pictured but rather in the burner compartment.

http://static.ddmcdn.com/gif/how-to-...-furnace-2.jpg

beenthere 10-08-2012 09:58 PM

Moved to HVAC forum.

techpappy 10-08-2012 10:21 PM

The unit is not equipped with a thermocouple. Has electric spark or glow coill ignition with a flame rod, flame sensor which completes voltage to gas valve when the pilot is lit and the sensor (flame rod) is working and senses the existence of the pilot flame. So, pilot should light first then, as long as the flame rod senses the flame the gas valve will open. If pilot lights then goes out then the sensor/flame rod is dirty or defective..try cleaning first..It is located next to the pilot assy and looks like a little porceline holder with a metal rod attached..the metal probe is positioned to have the tip in the pilot flame

Let us know if the pilot lights

OR..could be a "power pile" which is similar to a thermocouple but has two wires from it to the gas valve..

how 10-08-2012 10:57 PM

I believe I see a grounding wire on the pilot base assy which says its spark ignition.
No thermocouple....Uses rectifyer..flame rod.

graffij1 10-09-2012 06:47 AM

Techpappy you got it the pilot lights then goes out. I had a buddy out like two years ago and he cleaned it out. I'm not really trying to ask him to come over again for this. Is this something I could clean myself any how tos on the Web?

Also thanks for moving to the HVAC forum, whoever did that

danpik 10-09-2012 08:36 AM

The flame rod looks like a wire that stcks out into where the pilot flame is burning when lit.
They can sometimes be a bit of a hassle to get to. There will be a single wire coming from the end of it. It will also have a white or light grey ceramic insulator around it. Use a piece of fine steel wool to shine it up. Also check the connections to make sure there is no corosion on the connections on both the sensor and the board it is hooked to

graffij1 12-29-2012 05:34 AM

So here is the thing. I did nothing to clean anything I just took the cover off the front of the furnace and the pilot lights regularly...now I know this isn't right but it's been working for the past two months. I finally have time to fix it. what should I try first? Cleaning the flame rod?

beenthere 12-29-2012 07:16 AM

Yes, but carefully.

hvac5646 12-29-2012 08:50 AM

only two leads off valve...standard redundant valve.

hvac5646 12-29-2012 09:00 AM

...jjjjj


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