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Old 04-20-2011, 04:17 AM   #46
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Heat Pump or Newer high seer unit


Quote:
Originally Posted by JJboy View Post
So to charging 13 seer or higher: calculate subcooling. Measure the high side pressure at the liquid-line service valve pressure tap. Using a pressure temperature chart, convert high side pressure to saturated temperature. Then simply subtract the liquid-line temperature from the saturation temperature of the refrigerant in the condenser to determine the subcooling.

You got it.

The SC showing in the doc is ok to lower than 13 seer.
12 SEER would be over charged using the charging method that DOC showed. And I've seen more then 1, 10 SEER that was over charged using what that DOC showed for getting SC close.

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Old 04-20-2011, 07:07 AM   #47
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Heat Pump or Newer high seer unit


JJ here is an install manual for a 13 SEER Lennox unit. Read it carefully and it walks you thru charging an AC with several methods.

http://tech.lennoxintl.com/PDFs/506635.pdf
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Old 04-20-2011, 07:11 AM   #48
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Heat Pump or Newer high seer unit


Post one for a xc21 yuri so he can see the difference in required SC.
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Old 04-20-2011, 09:44 AM   #49
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Heat Pump or Newer high seer unit


Quote:
Originally Posted by JJboy

Do you mind explain how you do SH and SC?
Subcooling is easier I find as long as you have the right temperature conditions. Just simply get a temp probe on the liquid line out of the condenser and take your liquid line pressure and get the corresponding saturated temperature on your gauges.

Superheat depends on a few more things.
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Old 04-20-2011, 10:40 AM   #50
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Heat Pump or Newer high seer unit


Am I correct that this system is a fixed orifice valve system?
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Old 04-20-2011, 11:29 AM   #51
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Heat Pump or Newer high seer unit


Here's one for a 17 SEER and a 21 SEER ($6500 and up for those bad boys).


http://tech.lennoxintl.com/PDFs/506585a.pdf
http://tech.lennoxintl.com/PDFs/506587a.pdf
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Old 04-20-2011, 11:31 AM   #52
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Am I correct that this system is a fixed orifice valve system?
Beenthere should know as he is a Yorkie and should be here later.
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Old 04-20-2011, 12:28 PM   #53
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Heat Pump or Newer high seer unit


WOW. I have a lot material to study. Let me see if I can understand this SC finally. Thank All
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Old 04-20-2011, 07:07 PM   #54
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Standard in 2001 for York from the factory would be a piston. If it has a TXV, then someone splurged and installed it in the field.

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