A/C operating pressures vs. temperature

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Old 07-12-01, 08:08 PM
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I have a SEER 12 freon 22 home airconditioning unit. I am a licensed R-12 repairman. My home unit is acting like it is a little low on freon. The suction line is still pretty cool at the condensor outside, however, I would like to check the actual operating pressures to see if it is realy low or not. Does anyone know of a website that would have a pressure vs temperature chart and compensation for the higher SEER ratings available????? I appreciate any info you might have.
 
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Old 07-13-01, 01:52 PM
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A new system,installed correctly...Inside temp 78 degrees,outside temp 85 degrees pressures should be approx...65 low side or back pressure and 210 or head pressure...these ARE approx....not gospel, and for a system that has been well maintained.PDF
 
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