RXB PLUS ROTARY SCREW COMPRESSOR UNITSS70-101 IOM
Page 48
TROUBLESHOOTING THE RWB II PLUS COMPRESSOR
SYMPTOM PROBABLE CAUSES and CORRECTIONS
EXCESSIVE NOISE and VIBRATION Bearing damage or excessive wear. CONTACT Frick Factor or Frick Co.
Coupling loose on shaft. Tighten coupling. Replace if damaged.
Misalignment between motor and compressor. Realign motor and compressor.
Refrigerant flood-back. Correct system problem.
TROUBLESHOOTING THE OIL SEPARATOR
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.
Contaminated oil, damaged or not seated coalescer filter elements. Replace
oil charge and coalescers.
Oil return valve closed. Open return valve.
Return oil strainer blocked. Clean strainer.
RAPID LOSS WITH NO OIL LEVEL Compressor unit suction check valve did not close on shutdown. Repair valve.
IN THE COALESCER SECTION
SIGHT GLASS Bypass open around check valve (if field installed). Close bypass.
Economizer check valve (if applicable) failed.
Coalescer not seated. Reseal.
MAINTENANCE
TROUBLESHOOTING THE HYDRAULIC SYSTEM
SYMPTOM PROBABLE CAUSES and CORRECTIONS
SLIDE VALVE WILL NOT LOAD OR Solenoid coil may be burned out. Replace.
UNLOAD
Hydraulic service valve may be closed. Open valve.
Solenoid spool may be stuck or centering spring broken. Free spool or replace spring.
Solenoid may be mechanically actuated by inserting a piece of 3/16" rod against armature pin
and pushing spool to opposite end. If valve is mounted on compressor, push "A" side to
confirm unload capability. If valve is mounted on base, push "B" side to confirm unload capa-
bility. If valve works, problem is electrical.
SLIDE VALVE WILL LOAD BUT Solenoid coil may be burned out ("A" side if mounted on compressor, "B" side if mounted on
WILL NOT UNLOAD base). Replace coil.
Dirt inside solenoid valve preventing valve from operating both ways. Clean valve.
Solenoid may be mechanically actuated by inserting a piece of 3/16" rod against armature pin
and pushing spool to opposite end. If valve is mounted on compressor, push "A" side to
confirm unload capability. If valve is mounted on base, push "B" side to confirm unload capa-
bility. If valve works, problem is electrical.
SLIDE VALVE WILL UNLOAD BUT Solenoid coil may be burned out ("B" side if mounted on compressor, "A" side if mounted on
WILL NOT LOAD base). Replace coil.
Dirt inside solenoid valve preventing valve from operating both ways. Clean valve.
Solenoid may be mechanically actuated by inserting a piece of 3/16" rod against armature
pin and pushing spool to opposite end. If valve works, problem is electrical.
SLIDE STOP WILL NOT FUNCTION Solenoid coil may be burned out. Replace.
EITHER DIRECTION
Check solenoid coils (see Vi Control table, page 31).
SLIDE VALVE WILL NOT MOVE Slipper seals worn out or damaged.
Unloader spindle or slide valve jammed.
Internal check valve bad. Clean, repair, or replace.
Check needle valve adjustment.
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