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Old 01-10-2011, 09:31 AM   #15
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The pics didn't show up. I believe the small pipe in the first pic you posted, the broken one is a thermocouple. You are correct that the unit is manual burner on. But the pilot must be lit and the thermocouple must see the flame before the valve will open for the main burner. The pipe in the pic that goes up the left side is the pilot gas line, the main burner gas goes right up the center of the main burner I believe. See where the big hole in the side of the pipe is just below the main burner, I think that's where the air is mixed with the gas for the main burner. That screen around the pipe is the air shutter for the main burner. It may just be a knurled piece but it looks like a screen.

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Old 01-10-2011, 12:41 PM   #16
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Quote:
Originally Posted by TG Twinkie View Post
The pics didn't show up. I believe the small pipe in the first pic you posted, the broken one is a thermocouple. You are correct that the unit is manual burner on. But the pilot must be lit and the thermocouple must see the flame before the valve will open for the main burner. The pipe in the pic that goes up the left side is the pilot gas line, the main burner gas goes right up the center of the main burner I believe. See where the big hole in the side of the pipe is just below the main burner, I think that's where the air is mixed with the gas for the main burner. That screen around the pipe is the air shutter for the main burner. It may just be a knurled piece but it looks like a screen.
I agree with Twinkie.

I think it will make more sense to you when you have a thermocouple in hand.
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Old 01-10-2011, 06:45 PM   #17
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Hey Dan; Where is this air screw you mentioned in an earlier post?

The following is from your previous post.
((It has an air screw to adjust the amount of air running thru it. I would put a sparker on it replacing the pilot, but the burner won't run without the pilot running.))

I keep looking at your photo above and can't help but think that the thermocouple could be removed from the pilot housing.
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Old 01-10-2011, 07:14 PM   #18
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TG, The air screw is that round honey cone looking thing. Since I have two of these units and they are both not working at this time, I am going to see if I can get one of them apart. They looked as if they did not come apart, but hey they are also better then 50 years old. The tube with the small hat on it is press fitted into the mounting bracket, were it says Gereral Controls. That thermocouple may be just rusted in. I will let you know what the out come is. Thanks for all the insites. I always learn something about these trailers every week!
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Old 01-10-2011, 07:26 PM   #19
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Dan there is a thermocouple there built into the pilot light.

They don't do it that way any more.

You will want to make a little bracket to hold the new thermocouple unless it appears easy to disassemble the pilot burner without damaging it.
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Old 01-10-2011, 11:44 PM   #20
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Dan: I agree with Jammer, Don't damage the body of the pilot assembly by trying to remove the old thermocouple. If you would happen to get it out and the new one doesn't fit tight you may have flame coming out the hole where the old thermocouple was and you will certainly mess up the gas to air mixture. Cut the old tube off at the base of the pilot assembly. Then fabricate a bracket as we've mentioned to hold the new one in place.
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Old 01-11-2011, 10:12 PM   #21
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I did take apart the other unit and the thermocouple does go up inside the pilot tube. I picked up a thermocouple today at the big box store The packaging says that it has an electrical connection, meaning I guess that it works from a power source. But I figured I got it so I would give it a try, but no results, pilot still wont light, and main burner will only stay lit if the safety button is pushed in. I am now searching to see if there is a non electrical type. This unit is a Honeywell universal type for gas furnaces and hot water heaters.
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Old 01-11-2011, 10:26 PM   #22
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So now I am wondering if maybe the thermocouple needs to be heated up first before the gas would start flowing to the pilot light. Since the old thermocouple was in the middle of the pilot tube, when you went to light the pilot light, it would heat the thermocouple at the same time?
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Old 01-11-2011, 11:16 PM   #23
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The way it's supposed to work, you light the pilot while the button is pushed in, and hold it for 30 seconds or so. That gives the thermocouple enough time to heat up.

The thermocouple produces a small amount of electricity and does not need external power. The power it produces holds the safety valve open.

If the pilot won't light with the safety button down, then you have problems with the pilot in addition to whatever thermocouple problems you might have.
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Old 01-11-2011, 11:23 PM   #24
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Dan: Did you clean the bottom of the hole where the thermocouple is attached to the valve and make sure that when you put the thermocouple line in the hole that you push it in as far as it will go before tightening the nut? It is an electrical device that produces a very small amount of power. 20 millivolts; so it must make good contact with the mating part in side of the hole.
Can you post a photo of your current setup? Showing how you have the new thermocouple mounted etc.
How are you getting the main burner to fire if the pilot won't light?
Where is the button you are pushing in? Can you show us a photo of that as well?
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Old 01-12-2011, 10:37 PM   #25
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I am jumping for joy over this one, not jumping as high these days! I ended up heating the coupler first, then the pilot came right on. After about a minute the pilot stayed lit and then I turned the main burner on and "instant flame" After everything look good I attached a small hose clamp on the pilot tube adjusted the height to have it sit in the flame and retarted it. Everthing came right on without a hitch.
Thanks everyone for your help. I did not have any experence with this kind of stuff, but I know allot more now!
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Old 01-12-2011, 11:12 PM   #26
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Congatulations!

You are welcome! Glad to help especially when one has success.

By the way! Beautiful trailer you have.
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Old 01-12-2011, 11:30 PM   #27
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Outstanding!

I second the opinion that you have a beautiful trailer. Now you can keep warm too.
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Old 01-13-2011, 11:47 AM   #28
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Just be aware that some clamps are steel and some aluminum. You should check you used a steel clamp, not an aluminum clamp. (It looks like steel) Also, check after a few cycles to make sure the clamp hasn't loosened - although it loosening will just cause the thermocouple to fall out of the pilot light and stop it working.
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