Identify this duo therm furnace? - Fiberglass RV


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Old 11-08-2016, 01:27 PM   #1
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Name: Jeremey
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Washington
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Identify this duo therm furnace?

Hello, all!

I need to replace the thermocouple on my furnace.

It is a Duo Therm with no blower. It uses a millivolt thermostat.

I there is no model number that I can find. Can you recognize it?

Thanks ahead of time!
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Old 11-08-2016, 02:55 PM   #2
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Name: Gerry
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I was told that the thermocouple is a generic part and as long as the ends are the same size to fit the gas valve and it is long enough to reach where it needs to go, it will work
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Old 11-08-2016, 03:10 PM   #3
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The local RV place didn't recognize it. They said that the connectors were distinctive and that they would need a model number. I will take a pic of the thermocouple this afternoon.
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Old 11-08-2016, 03:16 PM   #4
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Name: Gerry
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If you know your going to replace the thermocouple you need to take it out anyway so just take it out and take that to the RV store and they can give you another one....as said it's a generic part and as long as it is long enough to go from the heat chamber end to the connection on the gas valve it will work.
A thermocouple works on presure of heated gas in the bulbous end and sends this presure to a switch in the gas valve to open main valve... Elec' plays no part in the operation of this part.
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Old 11-08-2016, 05:50 PM   #5
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Name: Terry
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I believe that a capillary was described earlier.
Capillary tubes work off of the pressure of heated gas. The most common uses in a rv or home is to control the temprature in ovens and in some cases refrigerators. They are not normally replaceable.
Termocouples produce small amounts of electricity through bi-metal when heat is applied correctly. They produce enough electricity to hold open a pilot valve. Thermopiles are a group of thermcouples packed into a case to produce enough electricity to control a furnace gas valve through a thermostat.
I try to have about 1/2" of the top in the flame.
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Old 11-08-2016, 09:29 PM   #6
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Name: Jeremey
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I took it into the local RV shop. They didn't want to help without a model number. Here is a pic...

There was a snap on type of collar that held it on.
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Old 11-09-2016, 12:24 AM   #7
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Name: Jack L
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look on amazon
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Old 11-09-2016, 06:17 AM   #8
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Name: Gerry
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Terry, I should have looked at the picture to see it wasn't the type that I have in my older Duo-therm
Tell me do these Electrical thermocouples have any specs that he should be concernd with?
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Old 11-09-2016, 06:19 AM   #9
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Jeremey, sounds like your RV dealer isn't very helpful and wants to be bothered....Can you find another dealer?
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Old 11-09-2016, 10:57 AM   #11
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It appears that mszabo has the correct information and more experience with this style furnace than I do.
There a few different configuration. The one he has is used in many milivolt wall furnace. If you need it quickly and your near an appliance parts store I would take it there for comparison. Many of them are happy to help.
I have bought a couple in the past from Home Depot, but they may not be carrying them any more.
Make sure you have a good pilot flame. It along with position will determine voltage.
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Old 11-09-2016, 11:49 AM   #12
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Name: Jack L
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Amazon lists quite a few that are for gas fireplaces. Some look similar to the one in your photo and several choices are less than $9.
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