26
SYMPTOMS AND TROUBLES
POSSIBLE CAUSES
REMARKS
Replace of wire
Replace
Repair or replace
Change Transmitter Capacity when POWER CAPACITY too small
Replace Wires to ones of standard size
Repair or replace
Replace
Disassemble and inspection of the Compressor Main Body
Readjust or Replace
Replace
Refastening/Packing change
Clean or Replace Element
Replace Element
Readjustment
Disassemble and check/Packing change
Replace
Replace
See “Discharge pressure increased” above.
Readjust, Repair or Replace
Replace
More Ventilation
Clean or Replace Recovery Orifice
Replace Element
Keep oil level between the red lines.
SOLUTIONS
5.4 A List of SHUTDOWNS Not Displayed on Instrument Panel
Ask your dealer or Hitachi’s Service Station if the cause of malfunction is unknown or with mark shown in a
REMARKS column.
Unit doesn’t start
Wire breaking
Motor malfunction
Voltage drop
Wires too thin
Motor abnormal
Start Solenoid Valve*: Failed.
Compressor’s revolution unable
Modulator Valve / Blow-off Solenoid Valve fault
Pressure Gauge Indication fault
Leak in Pipes
Intake Filter clogging
Oil Separator clogging
Pressure Regulating Valve fault
Suction Throttle Valve fault
Mechanical Sealing damage
Pressure Gauge Indication fault
Excess Over Rated Pressure
Relief Valve: Incorrectly adjusted or failed.
Poor operation of Oil Temperature Control Valve
Suction Air Temperature too high
Oil Scavenge Pipe System clogging
Oil Separator clogging
Oil level: Not between the red lines on oil level gauge.
Motor noise
inaudible
Motor noise
audible
Print circuit board, relays, failures, fuse
blown-out, transformer failure.
Discharge
Pressure
decreased
Discharge
Pressure
Increased
Relief Valve
operated
Discharge Temp.
too high
Lubricant
consumption
excessive
5. TROUBLESHOOTING [A List of SHUTDOWNS Not Displayed on Instrument Panel]
Adjustment of power and voltage
Inspection, flashing, oil change
Re-adjustment
Clean or Replace Element
Adjustment of power and voltage
Lowered or unbalanced voltage
Abnormal abrasive resistance in the rotating part (oil deterioration, seizure)
Unload setting for pressure control valve etc. is low.
Intake Filter clogging
Over-voltage
Current value
small
Other phenomena**
Current value
large
To be continued on page 27.
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