Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-08-2014, 12:16 PM   #1
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
Need help locating fuse on Armstrong TR21-12 air conditioner

An electrician mistakenly wired our new 30amp receptacle for 240v instead of 120v. Plugged in and tried the a/c. Nothing happened, so I checked all the breakers inside the trailer to find none were tripped. Went inside to heck the breaker there and noted that it was a double breaker, so I turned it off and disconnected the shore power cord. Now the heating element in the refrigerator is ruined, and the a/c still won't run. The plate on the unit says it must be protected by a fuse. Someone had posted a service manual for a 25-12 that mentions a 20amp, slo-blow fuse. I'm thinking I might get lucky and find a fuse blown, but I don't know where to look for it. Anybody have any ideas?
Hillbilly75 is offline   Reply With Quote
Old 06-08-2014, 01:07 PM   #2
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,497
Images: 1
Quote:
Originally Posted by Hillbilly75 View Post
An electrician mistakenly wired our new 30amp receptacle for 240v instead of 120v. Plugged in and tried the a/c. Nothing happened, so I checked all the breakers inside the trailer to find none were tripped. Went inside to heck the breaker there and noted that it was a double breaker, so I turned it off and disconnected the shore power cord. Now the heating element in the refrigerator is ruined, and the a/c still won't run. The plate on the unit says it must be protected by a fuse. Someone had posted a service manual for a 25-12 that mentions a 20amp, slo-blow fuse. I'm thinking I might get lucky and find a fuse blown, but I don't know where to look for it. Anybody have any ideas?
The "only" protection that the AC has, is a circuit breaker.

Circuit breakers, sometimes seem OK, but can be shot.

Best way to find out, is to remove the circuit breaker panel and check to make sure that each circuit breaker has an output when in the on position.

The AC never had an internal protection, when new. Someone of course could have changed that.

Andy
__________________
Andy Rogozinski
Inland RV Center
Corona, CA
Inland RV Center, In is offline   Reply With Quote
Old 06-08-2014, 02:36 PM   #3
Rivet Master
 
J. Morgan's Avatar
 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,868
Images: 11
I don't know where a fuse might be, but my bet is that the very first part that pops when double voltage was applied would be the 24v AC transformer.

If this is so, and that is all that popped you will get out pretty cheap and easy.
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 06-08-2014, 02:38 PM   #4
Rivet Master
 
J. Morgan's Avatar
 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,868
Images: 11
The a/c was on a double breaker?

Really ? I imagine the same electrician wired the breaker too?
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 06-08-2014, 02:41 PM   #5
Rivet Master
 
J. Morgan's Avatar
 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,868
Images: 11
If it is still wired on a double breaker, that means the wiring in the box is still screwed up, and you cant know for sure that your a/c is even hurt.
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 06-08-2014, 04:00 PM   #6
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
Yes, a double breaker. It was installed new just for the receptacle. Now I have gone back to my 15amp outlet with adapter. Is that transformer on top or inside the ceiling?


Sent from my HTC PH39100 using Airstream Forums mobile app
Hillbilly75 is offline   Reply With Quote
Old 06-08-2014, 04:24 PM   #7
Retired.
 
Currently Looking...
. , At Large
Join Date: Jun 2003
Posts: 21,276
The transformer is under the shroud, with what look almost like automotive wires going to it.
In 1975, some models have a separate switch for the unit and fan, generally on the ceiling assembly, and a remote thermostat. Are you sure the fan switch is "on"?
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 06-08-2014, 05:12 PM   #8
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
I don't see any switches on the unit. The thermostat has two fan speeds on it, and an on/off switch. I'm guessing the transformer will either look burnt, or somebody can tell me how to check it with a meter. Got really lucky on the fridge- hoping the a/c is a simple problem too!
Hillbilly75 is offline   Reply With Quote
Old 06-08-2014, 06:06 PM   #9
Rivet Master
 
J. Morgan's Avatar
 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,868
Images: 11
It probably looks something like this.

It may show visible damage or it can be blown and look fine.

http://www.bing.com/images/search?q=...F0CD1&first=23
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 06-08-2014, 06:35 PM   #10
Retired.
 
Currently Looking...
. , At Large
Join Date: Jun 2003
Posts: 21,276
If you have the on/off switch and high/low switch on the thermostat, you won't have a separate switch on the ceiling assembly.
Make sure you check the converter for proper output, also. Even though it may be humming, it may have burned out internally.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 06-08-2014, 07:01 PM   #11
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
I wondered about the converter also. It is one of the new progressive dynamics ones with "charge wizard". I'll have to get out the manual on it, but I'm pretty sure it has a built in over-voltage protection. Thanks for the picture! That will help me out a lot. I think I know approximately where to look now. Is the replacement going to be pretty easy to come up with? I'm guessing either a HVAC parts dealer or Radio Shack?
Hillbilly75 is offline   Reply With Quote
Old 06-08-2014, 08:16 PM   #12
Rivet Master
 
J. Morgan's Avatar
 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,868
Images: 11
If it is the transformer, a HVAC shop or a place like Grainger, or even an electrical supply store will have a transformer.

The transformer wont have to look the same , it will just have to have the same input and output voltage and amps, and of course it will need to fit in the space.
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 06-08-2014, 08:52 PM   #13
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
Sounds good. Hoping to get to look at it tomorrow after work.
Hillbilly75 is offline   Reply With Quote
Old 06-28-2014, 03:28 PM   #14
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
Found the transformer today and checked it with a meter. With shore power unplugged I get almost perfect continuity between the two terminals of the transformer, as well as between the terminals of the relay in any combination. Plugged in and turned on at the thermostat, I read no voltage anywhere. Going back out this evening to see if I can get the breaker out of the box and check it. It's a bear to get to-- under the water heater cabinet and partially hidden by a shelf.


Sent from my iPad using Airstream Forums
Hillbilly75 is offline   Reply With Quote
Old 06-28-2014, 03:35 PM   #15
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
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.


Sent from my iPad using Airstream Forums
Hillbilly75 is offline   Reply With Quote
Old 06-28-2014, 03:59 PM   #16
Rivet Master
 
J. Morgan's Avatar
 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,868
Images: 11
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.
J. Morgan is offline   Reply With Quote
Old 06-28-2014, 04:57 PM   #17
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
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?
Hillbilly75 is offline   Reply With Quote
Old 06-28-2014, 04:59 PM   #18
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
Here's the transformer and relay.[IMG][/IMG]
Attached Thumbnails
Click image for larger version

Name:	1403996299432.jpg
Views:	111
Size:	38.7 KB
ID:	215080  
Hillbilly75 is offline   Reply With Quote
Old 06-28-2014, 05:12 PM   #19
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
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.
Attached Thumbnails
Click image for larger version

Name:	1403997038456.jpg
Views:	120
Size:	47.8 KB
ID:	215081  
Hillbilly75 is offline   Reply With Quote
Old 06-28-2014, 05:44 PM   #20
2 Rivet Member
 
1975 31' Sovereign
Davin , West Virginia
Join Date: Feb 2013
Posts: 79
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?
Attached Thumbnails
Click image for larger version

Name:	1403999047033.jpg
Views:	97
Size:	27.4 KB
ID:	215085  
Hillbilly75 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Armstrong TR21-12 Help Please? Gael79 Furnaces, Heaters, Fireplaces & Air Conditioning 39 06-28-2016 05:16 PM
Pls help with locating fuse box brainatplay Sprinter and B-van Forum 2 10-18-2013 10:19 PM
Armstrong TR21-12 gonna fixey ??? pansy Furnaces, Heaters, Fireplaces & Air Conditioning 1 05-08-2008 07:08 AM
Schematic wiring diagram for Armstrong AC TR21-12, GO7series DMC Furnaces, Heaters, Fireplaces & Air Conditioning 4 10-06-2007 12:01 PM
Hello, looking for a schematic of the wiring in my Armstrong AC model TR21-12, DMC Member Introductions 1 07-10-2007 06:11 AM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 10:50 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.