mycom i160M - Page 67

2203M4JE-MY-iS2-N_2017.04.
Chapter 4
Compressor and Package Unit Operation
Screw Compressor i-series 4.3 When Stopping the Compressor for a Long Time
4-7
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 heater power and control panel power.
 Close the suction and discharge side shut-off valves.
 If an economizer or liquid injection is used, close the stop valve located at the compressor inlet.
When the compressor is stopped for more than a month, perform the following steps once a month:
 Turn the compressor shaft by removing the motor spacer plate (P/N: 235-2).
 Measure the unit pressure.
 Check for refrigerant leakage.
When restarting the compressor which has been stopped for more than a year, perform the following
steps.
 Check the motor insulation resistance.
 In addition, conduct the items instructed in the motor instruction manual.
 Replace or analyze the lubricating oil. When analyzing, 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 4-2 are not satisfied,
the oil must be replaced.
 Check for refrigerant leakage.
 Supply power to the oil heater at least half a day before staring operation..
 Before starting the operation, confirm that the refrigerant is not condensed in the package unit
by checking the package temperature and pressure.
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