2203M4JE-MY-iS2-N_2017.04.
Chapter 5 Maintenance and Inspection
Screw Compressor i-series
5.3 Compressor Disassembly Preparation
5-11
5.3.4 Removing Parts Connected to the Unit
If refrigerant gas or a mixture of refrigerant and oil remains in the compressor,
refrigerant gas may blow off when the closed circuit is opened. This may result in
injury such as frostbite or loss of vision. Be sure to confirm that there is no
residual pressure before opening any pipe connections.
If the compressor is removed when the temperature around the suction flange is
extremely lower than the ambient temperature, dew condensation may occur
inside the system. After stopping the refrigerating unit, leave it as it is for some
time.
When removing the compressor from the unit frame, disconnect the following parts.
(1) Flange motor (and motor wiring if necessary)
(2) The compressor's suction piping and discharge piping
(3) Compressor's lubrication piping
(4) Compressor's economizer piping and aquamizer (liquid injection) piping
(5) Electrical wiring for capacity control solenoid valves
(6) Motor spacer
(7) Bolts for installing compressor (leg bolts)
Since remaining oil may leak out when disconnecting the oil piping from the compressor, slightly
loosen the piping and observe the oil flow to decide whether to disconnect the piping right now or
extract oil first from the oil temperature gauge on the lubrication header.
When disconnecting electrical wiring, put markings so that it can be reconnected easily.
Unless reconnected correctly, the compressor may not start up or the capacity control system may
not operate.
5.3.5 Removing and Lifting the Compressor
When performing this section’s work, also refer to Section 3.2.3 "Transportation" in this manual Chapter 3.
The work to lift up or move the compressor must be performed by a qualified operator.
Make sure that the lifting equipment and wires have sufficient load capacity for the
compressor before starting the compressor lifting work.
Never try to perform disassembly or assembly while the compressor is lifted in the air.
5.3.6 Removing Oil from Compressor
Disconnection of the capacity control Φ8 piping [538] from the compressor will cause the oil remaining
inside to be drained by approx. 1 liter (i125*) or by 2 liters (i160*).
Prepare a container to receive oil and an empty can for storage before starting the work.
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