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Does your AC system need work if a test showed press of 75 low and 103 high side with an outside temp of 64 and inside of 72 and the placard on the unit shows design pressure of 150 low and 300 high?
Wiki User
∙ 18y ago
YES first of all the design pressures are only indicating what the pressure test at the factory was. a normal r22 system when running should have a low side pressure of 50 -60 and the highside will vary aroung 200 - 275. Your low side pressure is too high and your high side pressure is too low for the outside temperature and the low side pressure. Are you sure about these numbers? If your suction(low) pressure is reading 75psi then your high side should be reading well over 200psi. At an outdoor temp of 64 degrees, it seems that your suction pressure is too high. Block the airflow of the condenser fan w/cardboard,etc...if the high side gets a little higher and the low side goes up with it, then the valves in you compressor are shot and you need a new unit. This is caused by too high of head pressures (lack of airflow, dirty outside coils), lack of oil return to the compressor, or constantly running in an undercharged state. Sorry for the bad news.
Wiki User
∙ 18y ago
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