Posted by jimg.allentown on July 17, 2016 at 18:17:43 from (108.2.196.109):
In Reply to: CIH 8820 A/C posted by jeremy in ne on July 16, 2016 at 17:14:57:
100 is too low on the high side. At an ambient temperature of around 85 degrees F., your high side should run around 225 to 250 psi. Low side should run in the 35 to 45 psi range. Higher ambient temperatures could raise the high side pressure some. Also, the system needs to run for 10 minutes or so for the pressure readings to stabilize. You should not have ice on the expansion valve, but the low side (suction) line should be cool to the touch and sweat all the way to the compressor. It would probably be a good idea to add a high pressure cutout switch in the high side. R-134a pressures do tend to run higher than R-12 pressures did. Also, make sure that you have good air flow through the condenser. A restricted air flow will make the high side pressure go very high very quickly. Hope this helps.
P. S. As a side note, what are you calling pounds? If you are using the small cans, they are not pounds. They vary from 12 to 14 ounces. Refrigerant uses 16 ounces to the pound - not 12 ounces like Troy weight.
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