Schreiber Chillers Old 4 ton MRI - Manual (Page 31)

TROUBLE SHOOTING - PART II
REFRIGERATION SYSTEM INTERNAL PRESSURE USING REFRIGERANT R-22
* High Pressure Switch: Manual Reset - Cut out at 425 P.S.I.
* Low Pressure Switch: Automatic Reset - Cut out at 25 P.S.I.
WORKING REFRIGERANT PRESSURES R-22
* High Pressure: 185 to 325 P.S.I.
* Low Pressure: 45 to 70 P.S.I.
***NOTE***
These pressures are under normal ambient temperatures and chilled water
temperatures.
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