2202MYJE-MY-C8-N_2018.02.
Chapter 4 Operation of Compressor and Unit
Compound 2-stage Screw Compressor 3225**C 4.3 When Stopping the Compressor for a Long Time
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4.3 When Stopping the Compressor for a Long Time
When stopping the compressor for a long period of time, make sure to perform the following steps.
Turn off the motor main power.
Turn off the oil heater power and the control power.
Close the suction stop valve and discharge stop valve.
If the operation stop period is 1 month or longer, perform the following checks.
Operate the oil pump for 10 seconds per week.
After that, rotate the compressor shaft (10 rotations or more).
Measure the package unit pressure once per month.
Check for refrigerant leakage once per month.
When restarting the compressor after an operation stop period of 1 year or longer, check the system for
refrigerant leak and analyze the lubricating oil. If it is found as a result of the analysis that the control
criteria given in this Chapter, Section 4.1.5 Tables 4-1 to 4-3 are not satisfied, the oil must be replaced.
Also check the motor insulation resistance.
Supply power to the oil heater at least 1 day before operation start.
Before starting the operation, confirm that the refrigerant is not condensed in the package unit by
checking the package unit temperature and pressure.
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