Frick RWF Series User Manual

RWF ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
S70-600 IOM
Page 31
TROUBLESHOOTING THE RWF COMPRESSOR
SYMPTOM PROBABLE CAUSES and CORRECTIONS
EXCESSIVE NOISE and VIBRATION Main oil injection valve may be closed. Open valve.
Bearing damage or excessive wear. CONTACT Frick Factor or Frick service.
Coupling loose on shaft. Tighten coupling. Replace if damaged.
Misalignment between motor and compressor. Realign motor and compressor.
Refrigerant flood back. Correct system problem.
SLIDE VALVE and/or SLIDE STOP 4-way hydraulic control valve failed. Repair or replace.
WILL NOT MOVE
Slide stop indicator rod stuck. Contact Frick Factor or Frick service for assistance.
Check both S.V. and S.S. feedback devices for wiring and resistance.
Compressor must be running with sufficient oil pressure.
Unloader piston stuck. Contact Frick Factor or Frick service for assistance.
Slipper seals worn out or damaged. Contact Frick Factor or Frick service for assistance.
NOTE: Troubleshooting the compressor is limited to identifying the probable cause. If a mechanical problem is suspected contact the
Service Department, Frick . DO NOT ATTEMPT TO DISASSEMBLE COMPRESSOR.
TROUBLESHOOTING THE OIL SEPARATION SYSTEM
SYMPTOM PROBABLE CAUSES and CORRECTIONS
GRADUAL OIL LOSS WITH AN OIL Maintaining too high an oil level, lower level.
LEVEL IN THE COALESCER
SECTION SIGHT GLASS Refrigerant carryover or liquid injection overfeeding, correct operation.
Loss of suction superheat. Adjust evaporator feeds.
Contaminated oil, damaged or not seated coalescer filter elements. Replace
oil charge and coalescers.
Coalescer return valve closed. Open return valve.
Coalescer return valve closed. Open valve.
Coalescing oil return line strainer blocked. Clean.
Needle valve blocked. Clean.
RAPID LOSS WITH NO OIL LEVEL On shutdown, compressor unit suction check valve did not close. Repair valve.
IN THE COALESCER SECTION
SIGHT GLASS Suction check valve bypass valve open. Close valve.
Coalescers loose or not seated properly. Correct or replace.
On economized unit: economizer check valve not working. Repair or replace.
Economizer check valve not in automatic position or manually opened. Place in auto position.
SHAFT SEAL LEAKAGE If leakage exceeds normal allowable rate of 7 drops per minute, replace seal.

Frick RWF Series Specifications

General

Drive Type	Direct Drive
Refrigerant	R22
Type	Screw Compressor
Power Range	150 to 300 HP
Cooling Method	Air or Water Cooled
Control System	Microprocessor-based