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Old 06-28-2014, 04:35 PM   #15
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Overlander, you were right about the converter. Second evening of our camping trip last week the lights went dim. Ordered a replacement and had it shipped to the campground, and kept topping the battery up every day with the truck till it arrived. On that day, it went completely dead and wouldn't charge, even with a battery charger. Ended up with a warranty replacement on that, also.


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Old 06-28-2014, 04:59 PM   #16
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If you are comfortable doing so you need to check the power into the unit with a volt meter. Don't electrocute yourself though.

Treat BOTH the black and the white as if either one could electrocute you by touching either one and ANYTHING else... even the floor.

Neither one is safe til proven safe.
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Old 06-28-2014, 05:57 PM   #17
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Just took out the breaker and checked it. Continuity when on, open when off, so I guess there's nothing wrong with it. I don't really know where the power first comes into the unit. Any advice there?
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Old 06-28-2014, 05:59 PM   #18
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Here's the transformer and relay.[IMG][/IMG]
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Old 06-28-2014, 06:12 PM   #19
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I'm not an electrician, so this is a real head-scratcher for me. I think this might be the part I'm looking for though.
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Old 06-28-2014, 06:44 PM   #20
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I did find Romex coming in to a junction box inside the ceiling. Removed 2 wire nuts and unhooked the pair of black wires as well as pair of white wires. White to black Romex gave me a reading, so good there. BUT... Black Romex to white braided also gave me a reading! What's going on here?
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Old 06-28-2014, 09:59 PM   #21
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Ok, it is established that you do have power to the unit.

I assume that the braided wires are the feeders to the unit ?

I cant think of a situation where a properly wired and functioning unit would provide complete circuit across the black Romex and the white braided while the unit is not connected.

The white in the cooler is catching a ground and it shouldn't.

I am going to think a little.

(I am not an electrician either but I have a pretty good head for this kind of thing)


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Old 06-29-2014, 03:25 PM   #22
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All your assumptions about the wires are correct. Also, I double checked, in case I had lost my mind, and I am getting 123 volts or something black to white, and something less than that on the incoming positive to unit ground. Guessing the ground is melted somewhere and grounding directly to the trailer? From the incoming power, there is a box with 3 different components (2 plastic, one metal) all in a row. From there, wires connect via a plug-in connector and run in conduit to the roof unit. Not getting any power at all topside, so maybe I have it narrowed down to the three things inside the box. At times I feel I can find the problem myself, but I'm also tempted to just call an HVAC person. Since it was running great before, I'd kinda rather spend the money fixing something else, but it may be pretty hot in Ohio this weekend! Thanks for all the ideas so far, and let me know if you have a brainstorm. I'll try to get some pictures of what's in that box later, if you think that will help.


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Old 07-01-2014, 11:12 AM   #23
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Need help locating fuse on Armstrong TR21-12 air conditioner

Almost there! With some "phone a friend" help from a good HVAC man, I was able to locate the real transformer. It is in a rectagonal box along with two other devices.

It was the metallic thing on the very end. Had me read the incoming and outgoing voltages. Almost no output, and enough incoming to feel clear to my elbow. Next time I'll remember to unplug the shore power while disconnecting wires. So now I have removed the old one and waiting for a replacement from Grainger's. Click image for larger version

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This one is obviously burnt. Wires have turned brown and smells like smoke. I took it apart and found a lot of melted waxy stuff inside.


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Old 07-01-2014, 11:19 AM   #24
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Here's a pic of the Box that it was in, after I removed screws and pulled it down out of the ceiling. Click image for larger version

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Old 07-01-2014, 11:24 AM   #25
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@J. Morgan: I figured out the grounding issue, I think. There is a third copper wire that is a "common" ground for safety. I noticed that the installers of the ac unit followed the practice of twisting both grounds together. I guess there's enough contact between the shell of the coach and screws, etc. to make it always able to ground itself somewhat. My friend didn't offer an explanation, but he told me not to be concerned about it.


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Old 07-01-2014, 11:13 PM   #26
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It is my understanding that the common (white) and the ground (green or copper should not be together anywhere inside the trailer.

The ONLY place that white and green should come together is inside the main service just beyond the meter.

At least you know why now.


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Old 07-01-2014, 11:28 PM   #27
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Need help locating fuse on Armstrong TR21-12 air conditioner

Hopefully the burnt transformer will do it.

It should have been the weak link in an over voltage situation. With a little bit of good fortune it fried before anything else did.

I think the odds are good that the transformer is going to do the trick and get you up and running. These units are built pretty rugged compared to the new ones.

By the way, my old Armstrong is working on getting my.... Um my wife's trailer cooled down right now...

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Old 07-02-2014, 09:15 AM   #28
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Gotta keep her cool, for sure. My wife doesn't complain about the heat when we're camping, but she has asthma and I always worry that it's going to cause a flareup. Now the tracking website says my transformer should be here by noon. Wife is sewing new curtain clips like a mad woman... Hoping to get everything done in time to leave early in the morning for Columbus.
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