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operating, liquid refrigerant will flow into the condenser. Approximately 75% of the total requirement
estimated for the unit can be charged in this manner.
5.
After 75% of the required charge has entered the condenser, reconnect the refrigerant drum and charging line
to the service valve on the bottom of the evaporator. Again purge the connecting line, stand the drum with
the connection up, and place the service valve in the open position.
IMPORTANT
: At this point, the charging procedure should be interrupted and prestart checks made
before attempting to complete refrigerant charge. The compressor must not be started at this time.
(Preliminary check must first be completed.)
NOTE
: It is of utmost importance that all local, national, and international regulations concerning the
handling and emission of refrigerants are observed.
Compressor Maintenance
In order to work safely on centrifugal compressors, technicians need to be aware that there is a potential risk of the
low speed seal trapping pressure in the motor-housing. Refrigerant in the motor housing must be recovered by the
evaporator service port through the motor cooling drain line (shut off valve on drain line must remain open). As an
alternative the motor housing can be emptied through its pressure port on the inlet cooling-line. Never work on the
motor housing if not checked that its pressure is zero bar.
WARNING
Failure to remove all refrigerant pressure from the whole compressor can result in the pressure
ejection of components during disassembly operation and cause personal injury.
Any work on compressor has to be carried out only by trained technicians,
please refer to DAIKIN representative.
Once recovered the refrigerant from the compressor, service gauges must to be used to check if residual pressure is
still present inside the three section of compressor: Suction/Discharge – Gear Box – Motor Housing. Never work on
compressor if not checked that its pressure is zero bar in all three sections.
