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Old 07-07-2011, 03:12 PM   #1
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1974 27' Overlander
sanfrancisco , California
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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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Old 07-07-2011, 03:34 PM   #2
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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
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Old 07-08-2011, 11:26 AM   #3
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1975 25' Tradewind
Holland , Michigan
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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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Old 07-08-2011, 04:11 PM   #4
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1974 27' Overlander
sanfrancisco , California
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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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Old 08-08-2011, 01:49 PM   #5
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1972 27' Overlander
Saline , Michigan
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replacement fans

Does anyone have a replacement part number for Armstrong 21-12 blower motor fan
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Old 08-08-2011, 07:54 PM   #6
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1972 27' Overlander
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Has any one found replacement fan motors at some place like granger
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Old 04-01-2016, 05:02 PM   #7
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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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