Original message
| Mr Freeze
 |  "Air temp"
, posted Tue 16 Aug 11:41  
Hello,
I was wondering what the air temp difference across the indoor coil should be, is there a "rule of thumb" to use for a guide?
The unit I have istalled is a 1.5 ton, the pressures are where they are suppose to be as far as the charging charts go that come with the unit. (80 psi suction and 200 psi liquid) outdoor air temp was around 75 F
The return air in the house I measured is around 72F and the supply air temp near but after the coil is around 62F.
Do those pressure's look right? I think the suction is to high and the liquid is to low and the air temp comming out of the coil would have been closer to 50F, but according to the charging charts everything is good.
Any suggestions??
Thanks in advance
Dave.
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Replies:
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| rustymike
| "Re(1):Air temp" , posted Tue 16 Aug 14:09
If this is an R22 system, I would aim for about 64-70psig range on the low side.
A rule of thumb would say that you should have a 15-20* delta Tover the cooling coil. Your reading 10*.
Options are: reduce your air flow, check your coil orifice for corect size, recheck your superheat back to the compressor and your subcooling in the condenser coil.
No matter how idiot proof you make something better idiots will always try and screw around with it!
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