2202L5JE-DA-C5-N_2015.05.
5 Maintenance and Inspection
Compound 2-stage Screw Compressor 5.3 Compressor Disassembly Preparation
1612LSC Speed Increaser Type
5-11
5.3.4 Removing Parts Connected to the Unit
If there is residual high-pressure refrigerant gas or oil dissolved in the
refrigerant, the gas and oil may blow off when closed valves (components) are
opened. This may result in injury such as frostbite and loss of vision. Always
check and confirm the pressure in the compressor, before opening any pipe
connections and valves.
When removing the compressor from the mounting base frame, the following parts must be
disconnected beforehand:
(1) The coupling joining the compressor and driving machine
(2) The compressor’s suction piping flange and discharge piping flange (if the suction strainer is
connected directly to the compressor, remove the strainer too), and the intermediate piping
connecting the low-stage discharge port to the high-stage suction port
(3) Compressor lubrication piping (journal lubrication: 2 places, oil injection: 1 place, capacity control
loading/unloading: 1 place each)
(4) Capacity control operation electric wiring
(Depending on the situation of the workplace, unloader indicator assembly may be separated, with
the wiring left as it is. Refer to "5.7.15" in this manual.)
(5) Bolts for attaching compressor (leg bolts)
When removing oil lines from the compressor, there is possibility of gas and oil blowing out
caused by residual gas pressure. Moreover, any residual oil in the pipe will flow out. To be
prepared for this, either check the amount of oil outflow by slightly loosening the pipe joint or drain
the oil from the oil temperature gauge at the supply header before removing the pipe.
Work carefully in particular when disassembling the unloader cylinder block since there is residual
pressure and oil fills in the unloader cylinder. Moreover, prepare a larger volume container than
the unloader cylinder volume to receive oil flowing out.
For easy reconnection, disconnected electric wires should be properly marked for identification.
Any wrong reconnection may result in a startup failure or inability to operate the capacity control
mechanism.
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