Hello all, We have a portable refrigeration unit that's used for aerospace purging at Kennedy Space Center. The system has 2 circuits. 2 scroll compressors on each circuit. TXV metering. Recommended sub cooling is 14. Refrigerant R22. Total tonnage around 80. Condenser fans are all on 1000% with no VFD's. Problem: Has a factory charge of 90 lbs per circuit. Suction and discharge pressures oscillate up and down on an average of 30 psi. Discharge moves between 205 to 235. Suction moves between 45 to 68. Again, fans on the condenser coils is rock steady at 100% on. Can't get a good sub cooling calculation due to the fluctuation in the pressures. Any thoughts ??
Chilly56
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