RWB II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.200-IOM (DEC 11)
Page 39
TROUBLESHOOTING THE HYDRAULIC SYSTEM
TROUBLESHOOTING THE OIL SEPARATION SYSTEM
SYMPTOM PROBABLE CAUSES and CORRECTIONS
GRADUAL OIL LOSS WITH AN OIL
LEVEL IN THE COALESCER
SECTION SIGHT GLASS
Maintaining too high an oil level, lower level.
Refrigerant carryover or liquid injection overfeed ing, correct operation.
Loss of suction superheat. Adjust evaporator feeds.
Contaminated oil, damaged or not seated coalescer filter elements. Replace
oil charge and coalescers.
Oil float return valve closed, open return valve.
Float equalizing valve closed, open valve.
Coalescing oil return line strainer blocked, clean
Clean and check needle valve.
RAPID LOSS WITH NO OIL LEVEL
IN THE COALESCER SECTION
SIGHT GLASS
On shutdown, compressor unit suction check valve did not close, repair valve.
Suction check valve bypass valve open, close valve.
Coalescers loose or not seated properly, correct or replace.
SYMPTOM PROBABLE CAUSES and CORRECTIONS
SLIDE VALVE WILL NOT LOAD OR Solenoid coils may be burned out, replace.
UNLOAD
Valve may be closed. Open hydraulic service valves.
Solenoid spool may be stuck or centering spring broken, replace.
Check outputs 2 and 3 and fuses.
Solenoid may be mechanically actuated by inserting a piece of 3/16" rod
against armature pin and pushing spool to opposite end. Push A side to
confirm unload capability. If valve works, problem is electrical.
SLIDE VALVE WILL LOAD BUT A side solenoid coil may be burned out, replace.
WILL NOT UNLOAD
Dirt inside solenoid valve preventing valve from operating both ways, clean.
Solenoid may be mechanically actuated by inserting a piece of 3/16" rod
against armature pin and pushing spool to opposite end. Push A side to
confirm unload capability. If valve works, problem is electrical.
SLIDE VALVE WILL UNLOAD BUT A side solenoid coil may be burned out, replace.
WILL NOT LOAD
Dirt inside solenoid valve preventing valve from operating both ways, clean.
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 coils may be burned out, replace.
EITHER DIRECTION
Solenoid service valves may be closed, open.
Manually actuate solenoid. If slide stop will not move mechanical problems
are indicated. Consult Frick factor or Johnson Controls‑Frick.
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