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Old 04-21-2011, 07:41 AM   #15
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Fabulous write-up! Thanks very much for you time in doing that, it makes it a lot easier to understand.
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Old 04-21-2011, 08:06 AM   #16
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That is an awesome write up. Nice work. I hope others can use this to rejuvinate their Armstrong AC's.
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Old 04-21-2011, 08:42 AM   #17
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how about newer Armstrong tr 21-12

Great info exactly what someone needs to keep a good airconditioner running.

I have a 1972 international with Armstrong tr 21-12.
Has anyone found compatible parts for this system? IE compressor etc.

Steve
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Old 04-21-2011, 10:44 AM   #18
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I guess my curiosity question regarding converting this A/C to a heat pump unit is how you handle the potential of icing on the external condensor? While not perfect, the current Penguins that A/S uses have a defrost cycle built into them which reverses the system back to A/C mode (along with shutting down the fan motor) when the heat pump runs over a certain amount of time. This causes the external condensor to get warm and melts any ice on the fins. As one who has experienced icing during cool wet weather, it becomes pretty important to do this if you are in high humidity climes. Once iced over, the heat pump output plumets.

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Old 04-21-2011, 09:41 PM   #19
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Jack,
That's exactly what you'd have to do with this to defrost it. Usually the defrost cycle is controlled by the A/C electronics in the condenser unit. To defrost this one, I'll have to manually turn the thermostat to cool for 5-10 minutes every hour. Luckily, right now I live in the desert.

What I might do is make my own thermostat with a microcontroller that I can write my own program for. That would let me build in a software controlled defrost cycle based on outside air temp or put some kind of sensor on the outside coil. I was also thinking about adding in the propane furnace. That way the a/c will keep the inside cool, the heat pump will kick in for moderate temperatures, and the furnace will turn on when it gets too cold for the heat pump to work effectively. That's gonna have to wait a while until I catch up with some other projects.
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Old 04-21-2011, 09:43 PM   #20
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Steve,
Open it up and get the model number off the compressor. It might be the same as I had. Either way, you can google it and find a replacement.
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Old 04-22-2011, 09:52 AM   #21
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The fourth pic shows the modified cover. I had to extend the back to fit the new compressor.
I wonder if there is a shroud out there somewhere that would fit over the new assembly? I'm thinking that there could be a risk that a stone popped up from a passing truck or car could damage the cooling fins.

Plus, there's a definite possibility of streamlining it a bit, no?
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Old 04-22-2011, 10:07 AM   #22
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I wonder if there is a shroud out there somewhere that would fit over the new assembly? I'm thinking that there could be a risk that a stone popped up from a passing truck or car could damage the cooling fins.

Plus, there's a definite possibility of streamlining it a bit, no?
The original shroud could be used, if a little of the top was removed to accomodate the "Penthouse".

Easy to do since it's made with fiberglass.

Andy
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Old 04-22-2011, 04:43 PM   #23
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I wonder if there is a shroud out there somewhere that would fit over the new assembly? I'm thinking that there could be a risk that a stone popped up from a passing truck or car could damage the cooling fins.

Plus, there's a definite possibility of streamlining it a bit, no?
I have a custom made aluminum shroud for it. I just don't have it on in the picture.
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Old 04-23-2011, 06:34 AM   #24
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Thanks so much. I printing this to add to my "Airstream" folder.
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Old 05-28-2011, 07:58 AM   #25
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How is the noise with the new compressor and fan motor? My Armstrong is very loud and I am considering replacing it. However I have a friend that is a HVAC tech who could change the compressor for me. Thanks for the great post
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Old 05-28-2011, 08:56 AM   #26
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Very informative write-up. Always great to see something brought back to life, rather than just thrown away.

A sort-of related question, if anyone knows the answer:

On the various product descriptions for the Penguin Duo-Therm AC, reference is made to the "shroud/solar panel mount" without any further explanation.

I'm interested in both an AC and future solar panel placement.

Is the Penguin shroud somehow configured to accomodate solar panels?
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Old 05-30-2011, 07:13 AM   #27
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How is the noise with the new compressor and fan motor? My Armstrong is very loud and I am considering replacing it. However I have a friend that is a HVAC tech who could change the compressor for me. Thanks for the great post
My guess is it sounds like it did when new. There's a bit of air noise, but it's not from the motor, it's from all the air it pushes. You can hear the compressor when it's running, but it's not nearly as loud as the old one (which was dying).
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Old 05-30-2011, 09:25 AM   #28
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Jason,

Looking at the pictures, it does not look like the newer style compressor is all that much taller than the old one, if any?

Was it the connections that created the extra height?
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