Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-19-2013, 09:10 PM   #1
1 Rivet Member
 
Custer , Wisconsin
Join Date: May 2012
Posts: 17
A/C unit operation question

I just purchased a 76 international it has an Armstrong TRH25-14. I am not sure what normal operation should be. I turn the fan to low speed on the unit, set the switch on the stat to cool then when the compresor kicks in the fan reduces speed to about half. Seems to me it should stay the same. Im thinking it has a relay or something bad.

Also is there a way to have the fan be controled by the thermostat or is it on all the time?


Any help would be great!

Sam
__________________

__________________
Sam 7 is offline   Reply With Quote
Old 03-30-2015, 10:09 PM   #2
2 Rivet Member
 
1979 31' Sovereign
Stephenville , Texas
Join Date: Mar 2013
Posts: 30
Images: 2
I hope you dont mind if I hijack this thread but I figured since I have the same model unit as you i would fit right in...

Ive got a bad contactor on my unit. The compressor will not engage or cycle as a result.

I was wondering if anyone out there could point me to a proper replacement part/part number.

Ive spoken with a local HVAC supplier and they can find many contactor that's will work, however, since they cannot accurately cross-reference the current part nor does the part have any voltage specifications on it, they cannot find me a proper part for this specific application.
At the very least I hope someone can tell me the voltage ratings required for this part.

Below is all the info I have to go by...

Armstrong Furnace Company
Model: TRH25-14-11

Contactor
Make: RBM
Numbers listed on Contactor
128306-1955S
275B-018
7717


Sources of info I have found:

Original Owners Manual for AC Unit
http://www.airstream.com/wp-content/...f18e4e4aa2.pdf

Images of the current defective part and other parts of the AC
http://i16.photobucket.com/albums/b3...ps7fcfhabc.jpg

http://i16.photobucket.com/albums/b3...psrzccect0.jpg

http://i16.photobucket.com/albums/b3...psoqfxz5wo.jpg

http://i16.photobucket.com/albums/b3...psdemyzaha.jpg

http://i16.photobucket.com/albums/b3...pszvtvp63d.jpg
__________________

__________________
Gasgano1979 is offline   Reply With Quote
Old 03-30-2015, 10:39 PM   #3
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,140
Images: 2
Blog Entries: 5
The contactor is rated for 120 volts.


Sent from my iPod touch using Airstream Forums
__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 03-30-2015, 10:47 PM   #4
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,140
Images: 2
Blog Entries: 5
Sam 7
What is the power source? 20 Amp?
What size cord are you using?
The symptoms sound like voltage drop due to an inadequate power source.


Sent from my iPod touch using Airstream Forums
__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 03-30-2015, 10:57 PM   #5
2 Rivet Member
 
1979 31' Sovereign
Stephenville , Texas
Join Date: Mar 2013
Posts: 30
Images: 2
Quote:
Originally Posted by TG Twinkie View Post
The contactor is rated for 120 volts.


Sent from my iPod touch using Airstream Forums
I appreciate the quick reply.

is that 120v on all 4 plug-ins?
__________________
Gasgano1979 is offline   Reply With Quote
Old 03-31-2015, 08:06 AM   #6
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,140
Images: 2
Blog Entries: 5
Everything except the thermostat circuit is rated for 120 volts. The thermostat circuit is 24 volts AC.


Sent from my iPod touch using Airstream Forums
__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 03-31-2015, 08:12 AM   #7
Rivet Master
 
Currently Looking...
Nowhere , Somewhere
Join Date: Jul 2005
Posts: 6,419
Blog Entries: 2
Plugged into at least 20 amp source?. Twinkie has the right idea. Peace,Jim
__________________
avionstream is online now   Reply With Quote
Old 03-31-2015, 04:24 PM   #8
1 Rivet Member
 
Custer , Wisconsin
Join Date: May 2012
Posts: 17
Quote:
Originally Posted by TG Twinkie View Post
Sam 7
What is the power source? 20 Amp?
What size cord are you using?
The symptoms sound like voltage drop due to an inadequate power source.


Sent from my iPod touch using Airstream Forums
You are correct.

Mine works as it should. Just needed to remove my head from my backside.
__________________
Sam 7 is offline   Reply With Quote
Old 03-31-2015, 06:05 PM   #9
2 Rivet Member
 
1979 31' Sovereign
Stephenville , Texas
Join Date: Mar 2013
Posts: 30
Images: 2
Quote:
Originally Posted by TG Twinkie View Post
Everything except the thermostat circuit is rated for 120 volts. The thermostat circuit is 24 volts AC.


Sent from my iPod touch using Airstream Forums
Would you happen to know what would be a suitable replacement?

I didn't have a chance to go back by the hvac shop today due to work and probably won't be able to tomorrow either.
__________________
Gasgano1979 is offline   Reply With Quote
Old 03-31-2015, 07:42 PM   #10
Rivet Master
 
4RXLA's Avatar
 
1977 31' Excella 500
West Sacramento , California
Join Date: Feb 2008
Posts: 533
Images: 33
Blog Entries: 12
Mine only works when plugged into a 30 amp source. 20 amp will pop the breaker
__________________
4RXLA is offline   Reply With Quote
Old 03-31-2015, 07:56 PM   #11
2 Rivet Member
 
1979 31' Sovereign
Stephenville , Texas
Join Date: Mar 2013
Posts: 30
Images: 2
Also, would you happen to know what the voltage drop and the time delay that is required to work?
__________________
Gasgano1979 is offline   Reply With Quote
Old 03-31-2015, 08:17 PM   #12
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,140
Images: 2
Blog Entries: 5
10% is too much.
Why would you replace the A/C if only needs a new contactor. The old Armstrong unit can be repaired. It is a much better unit than the new ones.


Sent from my iPod touch using Airstream Forums
__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie is offline   Reply With Quote
Old 03-31-2015, 08:48 PM   #13
2 Rivet Member
 
1979 31' Sovereign
Stephenville , Texas
Join Date: Mar 2013
Posts: 30
Images: 2
Quote:
Originally Posted by TG Twinkie View Post
10% is too much.
Why would you replace the A/C if only needs a new contactor. The old Armstrong unit can be repaired. It is a much better unit than the new ones.


Sent from my iPod touch using Airstream Forums
I do not want to replace the Armstrong unit.
I want to replace the contactor but the local supplier nor the internet can show a suitable replacement for that part.
I spoke the the man from the HVAC store a little while ago, while knowing that the unit is 120v helps his search, he still needs to know what the voltage drops and time delays are.
He has boxes upon boxes of contactors, but he wants to know what the exact specifications are on the old unit so that he can give me the right part.
Neither up is has been able to find that specific info.
We both have found the original manual for it, which i posted above, but it does not list the specific requirements of the contactor functions.
__________________
Gasgano1979 is offline   Reply With Quote
Old 04-01-2015, 07:56 AM   #14
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 5,140
Images: 2
Blog Entries: 5
A/C unit operation question

I am confused with your statement on voltage drop. There should not be a voltage drop when it comes to the contactor. It has a 120 volt coil and the contacts are rated for at least that.
When it comes to any time delay. Once turned on, the start relay is the first to pick up. It gets the compressor motor turning. Once it is turning the run relay (contactor) picks up and the motor continues to run.
The compressor loads and unloads based on the thermostat setting.
To my knowledge the unit runs continuously unless you shut it off.


Sent from my iPod touch using Airstream Forums
__________________

__________________
Knowledge: "A gift to be shared. A treasure to receive."
TG Twinkie 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



Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:57 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.