AGL_Unit_LOCU_EN_Rev00
33
4
Start-up & operation
WARNING
Diesel effect!
System explosion!
The mixture of air and oil at high
temperature can lead to an explosion. Avoid operating with air.
Bef ore commissioning, ensure that all valves on the refrigeration unit are fully opened. Only qualified
personal and certified companies are allowed to carry out installation, commissioning, service and
maintenance work.
4.1 Evacuation
CAUTION
Inadequate refrigerant charge! Compressor damage!
Never energize the
unit/controller without minimum ref rigerant system charge. There is a risk of
malf unction of the controller in deep vacuum operation which can cause
compressor damage.
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 f urthest 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, s
hut 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.
Bef ore the installation is put into commission, it has to be evacuated with a vacuum pump. The
installation should be evacuated down to an absolute pressure of 0.3 mbar. Proper evacuation
reduces residual moisture to 50 ppm. During the initial procedure, suction and discharge shut-off
valves on the compressor remain closed. The installation of adequately sized access valves at the
f urthest point from the compressor on the suction and liquid lines is advisable. The 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.
The highest demands are placed on the leak-proof design of the installation and on the leak testing
methods
– please refer to EN 378.
4.2 Charging procedure
4.2.1 Refrigerant charging procedure
CAUTION
Service valve closed! Compressor damage!
Do not charge the unit with
vapour (gas). The suction service valve must never be f ully closed when the
compressor is running. This would cause damage to the compressor in the
same manner as explained above. This valve is provided f or ease of
connection and f or the f itting of service gauges without removing the unit
panel.
Содержание Copeland OLE-49
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