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4
Evacuation
IMPORTANT
The evacuation procedure is based upon achieving an actual system vacuum standard
and is NOT TIME DEPENDENT! The installation has to be evacuated with a vacuum
pump before commissioning. Proper evacuation reduces residual moisture to 50 ppm.
The installation of adequately sized access valves at the furthest point from the
compressor in the suction and liquid lines is advisable. The system must be evacuated
down to less than 3 mbar. If required break the vacuum with dry nitrogen. Pressure must
be measured using a vacuum pressure gauge on the access valves and not on the
vacuum pump. This serves to avoid incorrect measurements resulting from the pressure
gradient along the connecting lines to the pump.
IMPORTANT
Care must be taken that all components (solenoids, expansion devices, regulators, shut
off valves, etc...) in the refrigeration cycle, which separate a part of the installation when
de-energized, are manually opened to guarantee successful evacuation in the whole
piping system.
NOTE: The controller must be turned on before starting the evacuation.
NOTE: For proper evacuation, both the HPV and BPV regulating valves must be opened using the
evacuation mode in the unit controller.
To activate the evacuation mode:
1)
Press the SERVICE key to enter the "Service" menu
Figure 3: Service key
2)
Use the UP and DOWN keys to select the "Evacuation mode" sub-menu
3)
Press ENB to enable the evacuation mode (see Figure 4):
Figure 4
CC7.8.9/0519/E
3/7
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