RWF II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.610-IOM (JUN 11)
Page 40
TROUBLESHOOTING THE DEMAND PUMP SYSTEM
SYMPTOM PROBABLE CAUSES and CORRECTIONS
PUMP WILL NOT PRODUCE
ENOUGH OIL PRESSURE
TO START COMPRESSOR
Check pump rotation.
Check that service valves are open.
Filter cartridges may be blocked. Check PSID across filters.
Strainer may be blocked. Clean.
Oil pressure regulator set too low or stuck open. Readjust or repair.
Pump worn out. Repair or replace.
OIL PRESSURE RAPIDLY DROPS
OFF WHEN COMPRESSOR STARTS
RESULTS IN COMPRESSOR
DIFFERENTIAL ALARM
Main oil injection throttling valve too wide open or oil pressure
regulating valve improperly adjusted. Readjust both valves.
OIL PRESSURE FLUCTUATES Liquid injection overfeeding or refrigerant flood back from system. Make
necessary adjustments or correc tions
NOISE and VIBRATION Pump strainer blocked. Clean.
Liquid refrigerant overfeed. Adjust liquid injec tion.
Pump worn out. Repair or replace.
GREASE LEAKS FROM VENT PORT Normal leakage which will cease after initial operation. Black oil leaking
IN THE SIDE OF THE PUMP BODY from this vent indicates oil seal wear or failure. If leakage exceeds normal allowable rate of 7
drops per minute, replace seal.
OIL PRESSURE DROPS AS HEAD
PRESSURE INCREASES
Normal behavior. Set main oil injection and oil pressure for maximum head
pressure condition.
MAIN FILTER PSID IS TOO HIGH Filters clogged with dirt. Replace.
Oil is too cold. Allow oil to warm up and check again.
Service valve on filter outlet is partially closed. Open valves fully.
SHUTDOWN DUE TO IMPROPER OIL
PRESSURE (HIGH STAGE and BOOSTER)
The compressor must not operate with incorrect oil
pressure.
1. Refer to CONTROL SETUP - "OIL SETPOINTS DISPLAY"
in publication 090022 O.
MOTOR and BARE COMPRESSOR
REPLACEMENT
Refer to publication 070660 SM.
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