Compresor Removal - Hitachi RCUE40AG1 Installation, Operation And Maintenance Instructions

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CAUTION:
Do not charge OXYGEN, ACETYLENE or other
flammable and poisonous gases into the refrigeration
cycle when performing a leakage test or an airtight
test. These types of gases are extremely dangerous,
because explosion can occur. It is recommended that
compressed air or nitrogen be charged for these
types of tests.
Mineral deposits on water cooler plates act as
thermal insulators, and also act as resistance against
water flow, causing the water flow to decrease
running through them, and resulting in a decreasing
of the cooling capacity. Deposits on the plates should
be inspected at regular, intervals, experience with the
water Chiller will dictate accurate inspection intervals.
11.11. COMPRESSOR REMOVAL
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When Removing the Compressor
Remove the compressor while completing the following
procedures.
1. Collect all refrigerant into a condenser before this work.
2. Turn off the switch, DSW3 of the PCB in the magnetic
switch box in order not to operate the compressor
except for the cycle.
3. Circulate the chilled water sufficiently through the water
cooler, and operate the water Chiller for 10 minutes, and
check to ensure that the oil level is maintained at a
stable condition.
4. Stop the water Chiller and completely close the liquid
stop valve.
5. Operate the water Chiller after circulating water through
the water cooler.
6. Stop the water Chiller when the low pressure reaches at
approximately 0.05 MPa. Do not operate at the pressure
lower than 0.05 MPa. If operated, it will cause a
damages to the compressor.
These deposits should be removed by circulating
diluted acid through the water passes after the water
has been drained. As water in different localities
contains different minerals, different acids are
required, depending upon the thickness of the
deposits.
This unit is equipped with an operation hour meter. In
the case that the total operation time reaches 24,000
hours or 3 years pass after installation, exchange the
bearings of the compressor. For details, refer to the
Service Handbook for HITACHI Screw Compressors.
For R407C refrigerant system, charge the refrigerant
with liquid condition to avoid its composition change.
7. Wait for several minutes. If the low pressure increase up
to 0.45 to 0.5 MPa, repeat the above procedures 5 and
6 four or five times.
8. Turn OFF the power supply to the unit.
9. After these works above, almost all refrigerant can be
collected in the condenser.
10 Recover the rest of refrigerant from the water cooler and
the compressor.
11 Remove the bolts on the discharge and suction flanges
of the compressor.
12 Remove all the wiring of the compressor.
13 Remove the bolts fixing the compressor.
14 Remove the compressor.
MAINTENANCE
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