When It Is Not Used For Long Time - Hitachi HISCREW 2000 Series Instruction Manual

9. WHEN IT IS NOT USED FOR LONG TIME

Be sure to follow the measures below if the compressor is stored or stopped by reason of
Power supply problem for a long time. (Follow ○ marked items)
Measures
Open the 1/2-inch stop valve at the end
of the oil-draining pipe that extends
Measures
from the oil case and thus drain the con-
Before
densate. Close the 1/2-inch stop valve
Storing
when the oil comes out instead of the
condensate.
Measure insulation resistance between
each phase of the motor.
Check is stain is found to M-sheave
and V-Pulley.
Rotate the V-Pulley manually to check
compressor (screw block)'s rotation.
Measures
Check the V-belt.
Before
Restarting
Replace the lubricant.
Check power cables and terminals for
deterioration or rusting.
(NOTE) Ask your dealer or Hitachi Service Station for information.
The compressor air end (screw block) can have rustings if no anti-rusting measure
(Measures before storing, sealing) are done to it. If the unit is restarted, this may
result breakage in Locks or Bearings of the compressor.
If necessary measures are failed when to restart the unit, it may result damage to
the Locks or Bearing, burning in the motor, excessive wear of M-sheave and V-
Pulley, breakage of V-Belt to the compressor.
If lubricant has not been replaced when necessary or if enough flashing has not
been done to the unit, the lubricant deteriorates earlier than usual and this may
result clogging in Lock and Oil Cooler to the compressor.
56
Procedure for Long Time Stoppage and Storing
Criteria
(After stop, take out condensate one day later and do
not drain the lubricant.)
More than 1M ohm
at DC 500V Mega.
No rusting in the
slots.
Smooth rotation.
Check it for its tension
(Refer to the mainte-
nance standards) and
no crack from appear-
ance, and enough
elastic force is kept.
Replace in whole.
No deterioration nor
rusting.
CAUTION
Measures If Criteria Is Not Filled
To recover its insulation capacity,
or replace the motor. (NOTE)
Remove rusting with finer sand
paper from the slot (NOTE).
Disassemble and check the com-
pressor (screw block) (NOTE).
Replace V-belt (NOTE).
Replace it with new one.
Storage Period
3 to 6 months 6 to 12 months
○
Special
anti-rusting
○
measures
required.
○
Ask your
dealer or
Hitachi
○
Service
Station for
information.
○
○
○