Need help finding the design subcooling number

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Old 07-12-16, 01:13 PM
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Need help finding the design subcooling number

I put in my own furnace and ac setup about 6 years ago. I am no ac guy just self taught. I have the gauges and 410A freon to charge my system but I have run into a small problem. I can figure out the subcooling myself but the problem is that, The subcooling number on the sticker in the unit is gone. I have no idea what the design subcooling is. I have called the company several times and gotten no where. I only know how to charge this system using the subcooling method. Besides that from what I am told that is the best way to charge my particular system. If I can not get it from the company I do not know where to look next. The paperwork for the furnace and ac unit are not accessable anymore.

The unit is a American Standard Allegiance 15. Which is made by trane.

Trane USA Inc
model # 4A7A5036A1000BA
Serial # 92156512F .30Y

I have spent a few hours on the phone with trane and all they keep doing is sending me info on how to calculate the overall subcooling. Which does me no good as in that calculation you need the design subcooling specs that are only on that dam sticker thats destroyed from weather, completely unreadable.

Any help would be appreciated.
 
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Old 07-12-16, 06:45 PM
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http://www.calsag.net/documents/23-l110102.pdf

Trane doesn't give you a number like Carrier. You must calculate it using a chart. Your installation manual has that chart...
 
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Old 07-12-16, 06:52 PM
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I think the problem is OP doesn't know the design subcooling value needed to use the chart because the nameplate on the unit is illegible....
 
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Old 07-13-16, 08:29 AM
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Trane doesn't give you a number like Carrier. You must calculate it using a chart. Your installation manual has that chart...
However, the Chart requires a Subcooling Target Range provided by Trane & A.S. so you can look up the pressures & temps.

It also shows how to compensate for refrigerant line length & lift...
 
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