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Old 04-09-2014, 02:55 PM   #1
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1969 31' Sovereign
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Exclamation Armstrong AC Troubleshooting

Hello. After years of the former owner not using the AC on my 69 Sovereign, I had a tech charge the unit. Luckily, it fired up and blows 52 degree air. Trouble is, the cold air is only coming from one set of the interior coils. Air blowing across the other set of interior coils is room temp. The tech said that "one of the compressor pistons might be bad or there might be a blockage in the one set of coils".

I have parts on order, (compressor, reversing valve, etc.), to convert it to a heat pump as per a previous post.

My question(s) is does anyone have experience with a coil blockage or of a problem of this nature?

Any tips/experience re removing the unit from the roof for the heat pump conversion?

Thanks,
Ken
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Old 04-09-2014, 02:59 PM   #2
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Originally Posted by KennyD50 View Post
Hello. After years of the former owner not using the AC on my 69 Sovereign, I had a tech charge the unit. Luckily, it fired up and blows 52 degree air. Trouble is, the cold air is only coming from one set of the interior coils. Air blowing across the other set of interior coils is room temp. The tech said that "one of the compressor pistons might be bad or there might be a blockage in the one set of coils".

I have parts on order, (compressor, reversing valve, etc.), to convert it to a heat pump as per a previous post.

My question(s) is does anyone have experience with a coil blockage or of a problem of this nature?

Any tips/experience re removing the unit from the roof for the heat pump conversion?

Thanks,
Ken
Ken.

Your AC shop then knows NOTHING about your AC.

When the R-22 level in the system is "correct" then and only then will the temperature from both the front and rear coils be the same.

Andy
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Old 04-09-2014, 05:25 PM   #3
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I second Andy's comments about the knowledge of the shop.

The hot gas from the compressor, number of pistons does not enter the equation, is feed to the condensor and from there to the evaporator coil.

If for some strange reason there were 2 cap tubes on 2 separate coils you might have a clogged cap tube on one. I doubt that there a 2 separate coils on a unit that small.

First thought would be a low charge and you are only cooling the first half of the coil. If that is the case the coil will start to freeze over after some running time.
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Old 04-10-2014, 09:57 AM   #4
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I second Andy's comments about the knowledge of the shop.

The hot gas from the compressor, number of pistons does not enter the equation, is feed to the condensor and from there to the evaporator coil.

If for some strange reason there were 2 cap tubes on 2 separate coils you might have a clogged cap tube on one. I doubt that there a 2 separate coils on a unit that small.

First thought would be a low charge and you are only cooling the first half of the coil. If that is the case the coil will start to freeze over after some running time.
Howie.

If I remember correctly on the old Armstrong TAC-110 AC units, when the Freon level is low, most all the cooling is from the front coil. When the Freon charge is excessive, then most of the cooling is from the rear coil.

When the Freon charge is correct and if a probe thermometer is placed in the center of the front and rear coils, the temperatures will be exactly the same.

Andy
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Old 04-10-2014, 05:41 PM   #5
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Ken.

Your AC shop then knows NOTHING about your AC.
I joined this forum at the end of 2003, and have always enjoyed Andy's gentle nudges toward the right solution. I believe, once again, he is right.

Your Armstrong unit is probably the same one I keep running in my 1967 Overlander. In short, the cold refrigerant blows through the front coils, and then through the rear coils. The R-22 charge in your unit is suspect.

Feel free to go off & do all that heat pump stuff you talked about. I feel there is a very small return on investment due to the high cost of R-22 which is what your unit's coils were designed for.

Any other refrigerant will ... not work well.

Tom
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