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Old 07-14-2013, 04:14 PM   #1
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Armstrong AC troubleshooting

Recently got a 75 Sovereign that had been sitting for an indeterminate periof of time. I plugged her in and to my pleasant surprise it fired up OK and blew nice and cold. Yesterday I had to fiddle with the thermostat to get it to work. It would start and stop a few times then run. Today it fired up then stopped. Trying to start it again all I got is rapid clicking in the AC like a switch or solenoid or something. Does this sound like anything famililar to anyone?

I am suspicious of the thermostat. It has red, green, brown and black wires coming out of it. If I disconnect the thermostat which wires can I cross to turn on the AC to troubleshoot if the thermostat is the culprit?
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Old 07-14-2013, 05:15 PM   #2
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Quote:
Originally Posted by Lumatic View Post
Recently got a 75 Sovereign that had been sitting for an indeterminate periof of time. I plugged her in and to my pleasant surprise it fired up OK and blew nice and cold. Yesterday I had to fiddle with the thermostat to get it to work. It would start and stop a few times then run. Today it fired up then stopped. Trying to start it again all I got is rapid clicking in the AC like a switch or solenoid or something. Does this sound like anything famililar to anyone?

I am suspicious of the thermostat. It has red, green, brown and black wires coming out of it. If I disconnect the thermostat which wires can I cross to turn on the AC to troubleshoot if the thermostat is the culprit?
Sounds like your using an inadequate extension cord.

Andy
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Old 07-14-2013, 06:30 PM   #3
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You would need a 10 gage extension cord, a cord listed for 20 amps would work if nothing else is running. Also if are using adapters check them they heat up, melt, and bugger stuff up. I was just there..

Check your voltage and make sure your getting 110vs, and it's not dropping. If you got a solid 110 then find a good AC guy. The Armstrong units can be rebuilt. A good AC guy can get compressor, fan motor, and others parts that will work. I doubt there is " replacement parts" but he can find a 110 dual shaft fan motor at roughy the same size and power, etc..

I have a old Armstrong thermostat if you want it. It was off a 69 ambassador. It was still working when I disconnected it.

My Armstrong unit was in such bad shape, I just opted to go with a whole new unit.
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Old 08-03-2013, 09:39 AM   #4
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Hi My ol Armstrong pulled a weird on one me this week. It was VERY HOT (105) out.
We were packing for a trip so had it running, a couple hours after I started it, the blower motor seized. Shut it down and got the 1975 service manual out, started at the thermostat, all OK, removed inside cover and blower was stuck tight, some tapping with a hammer and care full prying, it freed up fine, turned on AC and all was great!! WHY???? These motors have never been lubed, not sure how. My AC
has 3 separate motors, compressor, upper fan and internal blower.
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Old 08-03-2013, 09:42 AM   #5
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1975 31' Sovereign
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Armstrong mod

Looking at the schematic of the Armstrong has anyone added a
time delay relay to shut off the blowers when the compressor is not running?? Looks feasible.
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Old 08-04-2013, 07:53 AM   #6
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My fan motor started doing that a few months befits it went out totally..
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Old 08-04-2013, 08:31 AM   #7
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a "must read" about old Armstrong AC units

If you want to know how far you can take an old Armstrong AC unit, have a good read of this thread:

http://www.airforums.com/forums/f427...dor-76432.html

Here's a click here if the line wrap doesn't let you get to the above link.

He upgrades the cooling function, and also adds a heat function.

Wow, huh?
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