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Old 02-01-2014, 06:13 PM   #1
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What is this part (dometic ac)

Hey all, I'm trying to troubleshoot a Dometic Duo therm brisk air non ducted 15,000 a/c.
Does anyone know what this wire is? I'm having no luck finding it on any diagram that I can find.

My compressor keeps shutting off and If I wrap my hand around this wire for a few minutes the compressor will come back on as if it is some sort of thermostat wire. I just want to double check that it is what I think it is.
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Old 02-01-2014, 06:21 PM   #2
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That was my guess as well.
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Old 02-01-2014, 07:24 PM   #3
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Are you sure it is a wires. It looks like the thermostat tube for the freeze control that goes outside to signal the coils are frozen and kicks in defrost mode. Can you see the small tube sticking out in the right of the picture with like solder at the tip.
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Old 02-01-2014, 07:42 PM   #4
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Are you sure it is a wires. It looks like the thermostat tube for the freeze control that goes outside to signal the coils are frozen and kicks in defrost mode. Can you see the small tube sticking out in the right of the picture with like solder at the tip.
Yes, it looks like solder at the tip. When you say outside where do you mean? It has a metal clip holding it across the intake filter.

Is it possible that the temp sensor that its attached to possibly went bad? It will kick off the compressor at just under 70°, no where near freezing.
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Old 02-01-2014, 08:28 PM   #5
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Quote:
Originally Posted by cedar creekin View Post
Yes, it looks like solder at the tip. When you say outside where do you mean? It has a metal clip holding it across the intake filter.

Is it possible that the temp sensor that its attached to possibly went bad? It will kick off the compressor at just under 70°, no where near freezing.
The end of the tube is attached tot he cooling fins/coils of the AC.
It may be defective it may be defective but you can check the box it goes into is a tin diaphragm that expands and contracts. That box should have a few wires coming out of it that signals the compressor to shutdown or startup. You may have to have a professional look at it cause it also may be low on ammonia and that can cutout the compressor also.
Good luck
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Old 02-01-2014, 08:59 PM   #6
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Thanks Iggy, I'll have to open the unit back up to see where the other end of that wire goes. The ac isn't that old and when the compressor kicks on it cools rather well and quickly. I'm hoping that it isn't low on freon.
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Old 02-03-2014, 07:24 PM   #7
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I'm in agreement that this is not a wire, as in an electrical wire. I'm almost sure it is a type of thermocouple and as stated it is probably for the freeze control. Thermocouple's used to be made with mercury within them, I don't know if they use that now or another medium for expansion and/or contraction. By placing your hand on it you created warmth which would expand the medium which then made an electrical contact (as posted by Iggy) then this allowed the unit to cycle. Thermocouples do go bad, but not often. There is a way to check them by using a volt/ohm meter and some way (maybe your hand) to get them to expand/contract then check the switch built into one end of them. As far as "it's not that old" I've seen brand new A/C t'couples not working brand new out of the box.
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Old 02-03-2014, 07:31 PM   #8
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Icing detector. It will shut of the compressor if it detects ice on the coils.
Prevents compressor failure and allows the ice build up to melt.

Service manual attached
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Old 02-03-2014, 07:58 PM   #9
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Looks like the mentioned thermocouple to me but I have only seen them where they are in contact with the evaporator so they can detect it's temperature.
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Old 02-03-2014, 07:59 PM   #10
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Quote:
Originally Posted by herk7769 View Post
Icing detector. It will shut of the compressor if it detects ice on the coils.
Prevents compressor failure and allows the ice build up to melt.

Service manual attached
The red arrow isn't pointing to the icing sensor.

I'll take a pic of icing sensor.


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