Commissioning Overview
Vertiv | Liebert CRD10 | User Manual 67
NOTES:
• After charging the refrigerants statically, do not turn on the compressor and charge the refrigerant
dynamically until the crank case heating device has been pre-heated for longer than 12 hours.
• For dynamic filling of the refrigerants, the charging speed should not be higher in order to avoid the
com- pressor damage.
2.
Charging refrigerant dynamically: Keep the refrigerant cylinder handstand, manually start the unit to
charge refrigerant dynamically (manually set the output value to 75% for the fan, start the compressor
after 5min -> adjust the compressor output to 72%). After compressor operation, refrigerant will be
suctioned to the system until there are no bubble in the sight glass and condensation supercooling is
more than 3 K, the superheat is more than 7 K. Observe the suction pipe of the compressor, ensure that
there are no frosted phenomenon on the surface of pipe and compressor. Ensure that there are 25-40K
discharge superheat.
Record the running parameters of the cooling system according to the requirements of CRD10 Air-cooled AC
Startup and Commissioning Report.
Record the parameters operating instructions
1.
Start the manual mode: Start-up from the panel – Enter level 2 password – Set the system – Manual
Mode – Manual Mode Enabled – Set to “Y”
2.
Start vacuum mode: Enable Manual Mode - Vacuum mode- Set to “Y”
• Close the transformer circuit breaker
• Ignore the “Fan/Power Failure” alarm after startup
• If the vacuuming starts before the vacuuming mode is started, “low pressure sensor fault” alarm will occur
after startup, and then ignore this alarm
3.
Manually start/stop each component
Enable Manual Mode- Start/Stop the output of corresponding component. The output percentage value of
the compressor and fan can be adjusted after they are started up
• Output percentage value of the compressor cannot be adjusted until the compressor has started up for
about 5min (i.e., the soft start is over)
• After the compressor is off (including manual turn-off and unit shutdown), the compressor will be in soft
shutdown status (in manual mode - the soft shutdown status is displayed as “Y”), but the derated speed
output will still remain. After the soft shutdown phase is ended (about 5-10min), the compressor is off. In
order to ensure the reliability of the compressor, avoid directly turning off the circuit breaker of the
compressor.
NOTES:
• Refer Section 3.9 for the calculations of the refrigerant refill and charging
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