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GENERAL STARTUP INSTRUCTIONS
Evacuation
To avoid inclusion of air or moisture in the refrigerant circuit, be
sure to execute vacuum drying of the entire circuit before charging
refrigerant by using a vacuum pump. Execute evacuation after
securely carrying out airtight/pressure testing.
> When performing vacuum drying, make sure that valve EC1
and EC3 are fully open, please refer to chapter "Manual mode
for evacuation procedure".
Dehydration of circuits
This operation must be carried out with all valves open (including solenoid
valves) with connection to a vacuum pump:
–
of the low pressure side
–
of the high pressure side
The quality of drying should not be judged by the speed at which the level of
vacuum is reached but on the effective time it is held (24 hours at 0.7 mbar is a
good standard).
The total increase in pressure after that period should not be more than 2.6 mbar.
The residual moisture in the system should be less than 10 ppm.
When the installation is under vacuum, an insulation check of the motor should
not be carried out nor should the compressors be started before at least 1 bar of
fluid pressure is reintroduced.
This is to prevent motor winding damage.
Refrigerant and Oil Charging
–
Calculate the refrigerant and oil charge prior to charging
appendix
1).
–
Execute refrigerant charging immediately after evacuation.
–
Charge refrigerant R744 (CO2 refrigerant).
–
Do not mix with other refrigerant.
–
Always use refrigerant grade R744, moisture content must be below 10
ppm.
(refer to
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