Chiller tripping on High Pressure fault

[joshimh]

Hi,
Need your help again, I have this FreezeCo chiller faulting out on "Compressor High Pressure" alarm.
Refrigerant : R22
Compressor : 1
Application : Cooling process coolant
Condensor : Very clean, no blockage to air flow
It has In built High Pressure gauge showing 230 PSI, Low pressure gauge showing 45 PSI. When I connect my gauges it shows 330 PSI and 145 PSI. Also it faults out at the end of the cycle when thermostat is satisfied and compressor is about to turn off. In built High pressure gauge needle will start shaking, unit will fault out and compressor stops. Can not read model number or serial number on the unit.
Any help will be greatly appreciated.
Josh

[r.bartlett]

as a guess contaminated or overcharged. pull the gas and weigh in fresh

[SCT]

Ask if anyone had worked on this chiller recently and if so what did they do - if so good indication of overcharging as mentioned above, they may have charged system by the inaccurate system gauges. Otherwise the usual checks for HP issues, are the condenser fans turning the right way? etc

[Tesla]

Hi Josh & welcome to our forum
we need to know the air on temp of cond with pressure for a more accurate diagnosis. Should not rely on chiller mounted gauges as they sit there all day vibrating, slipping out of callibration.