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Old 10-18-2011, 10:54 PM   #16
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American Standard AUX120C960D2 Parts?


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Originally Posted by hvactech126
yes, too little amp draw
Working on a ptac back pressure is 40lb head pressure is 130 r22 was weighed in to specs,delta t across evap is 25-28 f the main problem is the filter drier leaving the compressor to the condenser is icing (first time for me) seems like the liquid is not boiling at evap therefore getting flood back at compressor still don't get the icing. Any suggestions?

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Old 10-18-2011, 10:58 PM   #17
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American Standard AUX120C960D2 Parts?


Quote:
Originally Posted by Zuna316

Working on a ptac back pressure is 40lb head pressure is 130 r22 was weighed in to specs,delta t across evap is 25-28 f the main problem is the filter drier leaving the compressor to the condenser is icing (first time for me) seems like the liquid is not boiling at evap therefore getting flood back at compressor still don't get the icing. Any suggestions?
I forgot to mention that someone replaced a 12 ton comp. With a 15 ton. Am sure that could very well be the problem
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Old 10-18-2011, 11:12 PM   #18
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American Standard AUX120C960D2 Parts?


Quote:
Originally Posted by Zuna316

Working on a ptac back pressure is 40lb head pressure is 130 r22 was weighed in to specs,delta t across evap is 25-28 f the main problem is the filter drier leaving the compressor to the condenser is icing (first time for me) seems like the liquid is not boiling at evap therefore getting flood back at compressor still don't get the icing. Any suggestions?
What do you suggest I was thinking of putting smaller compressor
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Old 10-18-2011, 11:20 PM   #19
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American Standard AUX120C960D2 Parts?


Well two things..
It is better to start your own thread.

The drier should have been changed when the compressor was replaced. Are you sure about that compressor size?? That's a hell of a ptac at 12 tons.
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Old 10-19-2011, 08:10 AM   #20
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American Standard AUX120C960D2 Parts?


Thanks for all the advice. As I know some folks that work at Grainger (as their HQ is here) I can get a good discount.

I did a quick look and it looks like this would work. I did notice that it was listed as a 5 spd vs. a 4 spd.

http://www.grainger.com/Grainger/wwg...N=0&sst=subset

Thanks...
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Old 10-19-2011, 04:28 PM   #21
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American Standard AUX120C960D2 Parts?


Get me your exact model , I'll get you info on motor and may be able to email parts breakdown
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Old 10-19-2011, 04:42 PM   #22
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American Standard AUX120C960D2 Parts?


MOT08842 3/4 hp , 1100rpm , 115 v , 48 frame
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Old 10-19-2011, 05:14 PM   #23
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American Standard AUX120C960D2 Parts?


Thanks that can help. A breakdown would be good. Or if I can order the part direct. Is this something that you can service and sell? PM me or let me know how to get in contact.

Thanks!
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Old 10-22-2011, 11:14 AM   #24
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American Standard AUX120C960D2 Parts?


I did some more testing with the original motor in the unit. It is pulling close to 16 amps (15.4) on startup and running around 7.8 amp. This looks a bit high and the reason I am looking to replace is the large draw/hum at startup.
Thoughts if I am going down the right road?

Thanks Again!!
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Old 10-22-2011, 04:00 PM   #25
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American Standard AUX120C960D2 Parts?


check the capacitor.... A weak cap will cause a hum and high startup amps.
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Old 10-22-2011, 05:26 PM   #26
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American Standard AUX120C960D2 Parts?


Hi ,

thanks for that advice. I did replace the capacitor as I thoguht tht might be the issue and was the cheap fix. After a new cap the current amp draw and hum is the same as before.

So I am guessing the motor is next? just want to make sure before I order one.

Thanks.
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Old 10-22-2011, 05:51 PM   #27
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American Standard AUX120C960D2 Parts?


You can change the cap and buy some time. But you will be looking at a motor soon. Might be next week, might be next month. No way to tell...

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