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07-07-2011, 02:12 PM
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#1
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1 Rivet Member
1974 27' Overlander
sanfrancisco
, California
Join Date: May 2007
Posts: 10
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Armstrong A/C unit TR21-12 capacitator
Hello all from TWINKE 74...Summer is here! But ac is NOT!.....I know somewhere on this sight is the info I need! BUT I can't find it...my problem is the start capicitator,located in the metal box on the road side of ac unit.I have read that they are avilable from Grainger but what electrical values and recomended granger part # any help ? my airstream is a 1974 Overlander... THANK YOU
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07-07-2011, 02:34 PM
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#2
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3 Rivet Member
Vintage Kin Owner
Hueytown
, Alabama
Join Date: Apr 2011
Posts: 174
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Twinkie74, Try Teds Capacitors, North Carolina. They should have just what you need. I have purchased capacitors from them and they are great.
Discount Electronic Components – Tedss.com
__________________
Thanks, Jerry and Ginger
AIR 55079
"Son, you can do anything you want, as long as you can read".. J.P. Rambin
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07-08-2011, 10:26 AM
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#3
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Mini Rivet
1975 25' Tradewind
Holland
, Michigan
Join Date: Sep 2008
Posts: 273
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I just replaced all my capacitors on my Armstrong TR21-12, here are the values of the originals.
Compressor: 30MFD 370VAC
Blower motor: 7.5MFD 370VAC
Fan Motor: 7.5MFD 370VAC
Start capacitor: 21-25MFD 250VAC
Here are the Grainger part numbers
30MFD 370VAC, #2MEC9
7.5MFD 370VAC, #2MDV6
21-25MFD 250VAC,#6FLU1
The original "compressor", "blower motor" and "fan motor" capacitor was one unit. I don't think they make such a beast today, so you need 3 different capacitor to replace the old 3 in 1 unit.
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07-08-2011, 03:11 PM
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#4
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1 Rivet Member
1974 27' Overlander
sanfrancisco
, California
Join Date: May 2007
Posts: 10
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armstrong TR12-12 ac capacitors
BINGO!!! thats it! I knew someone would have it...about a year ago I read as much about these units that I could get my hands on and found similar info but was at a loss to recall where that info was...the AC works fine now but it is olny a matter of time for failure,its prudent to do preventive repairs for reliability. THANK YOU VERY MUCH...your time and efforts will not have been wasted! Bruno of twinke74.
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08-08-2011, 12:49 PM
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#5
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3 Rivet Member
1972 27' Overlander
Saline
, Michigan
Join Date: Oct 2002
Posts: 189
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replacement fans
Does anyone have a replacement part number for Armstrong 21-12 blower motor fan
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08-08-2011, 06:54 PM
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#6
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3 Rivet Member
1972 27' Overlander
Saline
, Michigan
Join Date: Oct 2002
Posts: 189
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Has any one found replacement fan motors at some place like granger
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04-01-2016, 04:02 PM
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#7
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New Member
Currently Looking...
Fort Pierce
, Florida
Join Date: Nov 2015
Posts: 4
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How did you connect the common wire? Ive got the three capacitors but im at a loss on what to do with the common wire. Thanks for any help.
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06-11-2020, 01:33 PM
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#8
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1 Rivet Member
1974 27' Overlander
Naples
, Florida
Join Date: Sep 2015
Posts: 13
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Unit BTU or watts usage
Anyone have this info for a 1973 overlander with Armstrong
TR21-12?
Thanks
bjnaples
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04-26-2023, 12:06 PM
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#9
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1 Rivet Member
1968 28' Ambassador
Roswell
, New Mexico
Join Date: Nov 2020
Posts: 14
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Armstrong TR21-12 Fan motor from Grainger
I bought this from Grainger in 2020 and it dropped right in;
CENTURY Room Air Conditioner Motor: 3 Speed, 1/6 HP, 1,075 Nameplate RPM, 115V AC, CCWLE
Worked perfect on the 1968 Armstrong TR24-12 year model anyway
Grainger Item# 4MA53
Mfr. Model# RAL1016
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