HELP, On Armstrong AC Thermostat

[mburgess1431]

HI,
I have a 1971 Airstream Sovereign with the original Armstron AC, model no TR21-12. I am replacing the original thermostat. The new one I bought is a white rodgers. The white rodgers thermostat has terminal that have designators such as w,rc,rch, b,y,etc. My rv has a brown,black,red,and green wire. I do not have a clue on which terminals to connect these 4 wires to. Can anybody help me on this? Thanks for your time.
Matt

[overlander63]

Originally Posted by mburgess1431

HI,
I have a 1971 Airstream Sovereign with the original Armstron AC, model no TR21-12. I am replacing the original thermostat. The new one I bought is a white rodgers. The white rodgers thermostat has terminal that have designators such as w,rc,rch, b,y,etc. My rv has a brown,black,red,and green wire. I do not have a clue on which terminals to connect these 4 wires to. Can anybody help me on this? Thanks for your time.
Matt

Welcome to the forums.
If you can wait until tonight, I can take a photo of our thermostat, with the wire colors visible and the connectors labeled.

[mburgess1431]

Terry,
That would be awesome. This thing has me at the end of my rope. Thanks so much. Matt

[overlander63]

Originally Posted by mburgess1431

Terry,
That would be awesome. This thing has me at the end of my rope. Thanks so much. Matt

Strangely enough, I have a photo of it opn my cell phone at work. The colors and letters are as follows, I can still post a photo if needed:
G= black
W= not used
Y= brown
Rh= larger red
Rc= smaller red

[mburgess1431]

Terry,
Wow and thanks. Did yours have a green wire? Im assuming you had two red wires? Thanks
Matt

[mburgess1431]

Terry,

If it isn't too inconvenient,can I take you up on the picture. I hate to have to ask,but just really struggling with this thing and I have to have it finished by Thursday night.
Thanks Again
Matt

[overlander63]

Originally Posted by mburgess1431

Terry,

If it isn't too inconvenient,can I take you up on the picture. I hate to have to ask,but just really struggling with this thing and I have to have it finished by Thursday night.
Thanks Again
Matt

I knew I should have gone ahead and snapped a photo of it last night. I'll post a pic tonight.

[agdadof4]

Originally Posted by overlander63

Strangely enough, I have a photo of it opn my cell phone at work. The colors and letters are as follows, I can still post a photo if needed:
G= black
W= not used
Y= brown
Rh= larger red
Rc= smaller red

I am so glad I found this post. We purchased our '72 Overlander 8 days ago and the A/C thermostat was not hooked up. The guy said he had been using a portable unit inside and hooked it up to a replacement thermostat. I thought we were taken advantage of until I got the right combo that you provided here. It will be much easier to get in it and work in this Texas heat now that it will be cooling.