RXB PLUS ROTARY SCREW COMPRESSOR UNITS S70-101 IOM
Page 49
MAINTENANCE
TROUBLESHOOTING THE LIQUID INJECTION OIL COOLING SYSTEM
SYMPTOM PROBABLE CAUSES and CORRECTIONS
HIGH OIL TEMPERATURE Insufficient liquid supply. Check receiver level. Check strainer.
Equalizer pressure too high. Lower pressure.
Suction superheat too high. Correct system problem.
Thermal valve power head lost charge. Replace.
Liquid strainer blocked. Clean.
Liquid supply line not sized properly. Install larger line.
Operating conditions significantlydifferent from design.
LOW OIL TEMPERATURE Equalizing pressure too low. Raise.
Suction superheat too low or refrigerant flood-back on compressor. Correct
system problem.
Low load conditions. Valve oversized, increase load or use smaller thermovalve.
Operating conditions significantlydifferent from design.
OIL TEMPERATURE FLUCTUATES System conditions rapidly fluctuate causing liquid injection system to overrespond.
Stabilize system operation.
TROUBLESHOOTING THE OIL PUMP SYSTEM
SYMPTOM PROBABLE CAUSES and CORRECTIONS
PUMP WILL NOT PRODUCE Filter cartridge may be blocked. Check PSID across filter. Replace filter.
ENOUGH OIL PRESSURE
TO START COMPRESSOR Strainer may be blocked. Clean.
Oil pressure regulator set too low or stuck open. Readjust or repair.
Low oil level. Add oil.
Excessive refrigerant in oil. Equalize separator to a lower pressure.
OIL PRESSURE RAPIDLY DROPS Oil pressure regulating valve improperly adjusted. Readjust valve. Check manual system.
OFF WHEN COMPRESSOR STARTS
Regulator defective. Replace.
Excessive refrigerant in oil. Check heaters.
OIL PRESSURE FLUCTUATES Liquid injection overfeeding or refrigerant carryover. Make necessary adjustments
or corrections.
Dirty oil filter. Replace
Low oil level. Add oil.
NOISE and VIBRATION Pump strainer blocked. Clean.
Liquid injection overfeeding. Adjust liquid injection.
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. Replace seal.
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 valve fully.
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