17
4. DAILY CHECK
Record the operation status of the day in OPERA-
TION RECORD LOGBOOK (
☞
p.
67). Mainte-
nance must be carried out if checked values show
excess over allowable criteria.
4.2 Control of Condensate
The oil temperature control valve controls the oil
temperature and thus prevents the condensate
from being produced in the oil case under the nor-
mal operating conditions.
Under the following operating conditions, however,
the condensate may be produced in the oil case.
1. The ambient temperature and relative humidity is
as high as:
30°C and more than 80%, and
40°C and more than 50%.
2. The A stops and restarts repeatedly.
3. The oil cooler cools the oil excessively.
If this is the case, open the oil draining valve and
check if the condensate comes out. Drain the con-
densate as required.
Draining the Condensate before Starting
the A
q Make sure that the A is not operating
and the discharge pressure gauge reads 0 MPa.
w Close, and then unplug, the oil-draining valve
on the pipe extended from the oil case.
e Place the oil pan under the oil-draining valve.
r Open the oil-draining valve.
t The oil comes out and the condensate follows.
y When the oil starts to come out again, close and
plug the oil-draining valve.
If the condensate is not discriminable from the lubricant,
check its viscosity by your finger tips while draining. Be
sure the condensate is well cooled before touching it. If
the condensate sticks to your fingers, the lubricant is
coming out.
4.1 Daily Operation Management
● Running the compressor for long time
without draining may cause not only
troubles to the Rotor and Bearings in its
air end, but other majour troubles like
rusting inside equipments.
● In case of multiple unit operation, it is rec-
ommended to attach an oil cleaner to the
unit. Ask your dealer or Hitachi’s service
station for this information.
● Do not open the oil-draining valve when
the A is operating. Otherwise the
hot oil gushes out and you may be injured
or burnt.
CAUTION
1. Before check and maintenance of the compressor, carefully read “TO USE IN SAFETY” (
☞
p.
2)
again.
2. Be sure to turn OFF the POWER when check or maintenance is carried out.
3. Never touch rotating parts of the compressor (Motor Shaft, M-Sheave, V-Pulley, V-Belt and Cooling
Fan).
WARNING
IMPORTANT
Take this
plug out.
Saucer
Furnished b
user
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