US
18 | AQ450440479309en-US0201
© Danfoss | Climate Solutions | 2023.07
6| Commissioning
6.1 Preparations for start-up
The compressor has undergone trials in the factory and all functions have been tested. There are
therefore no special running-in instructions.
Check the compressor for transport damage!
6.3 Leak test
Carry out the leak test on the refrigerating plant in accordance with UL 207 or a corresponding
safety standard, while always observing the maximum permissible overpressure for the compressor.
To protect the compressor against inadmissible operating conditions,
high pressure and low pressure pressostats are mandatory on the
installation side.
Risk of bursting!
The compressor must only be pressurized using nitrogen (N
2
).
Never pressurize with oxygen or other gases!
The maximum permissible overpressure of the compressor must
not be exceeded at any time during the testing process (see name
plate data)! Do not mix any refrigerant with the nitrogen as this
could cause the ignition limit to shift into the critical range.
6.2 Pressure integrity test
The compressor has been tested in the factory for pressure integrity. If however the entire system is
to be subjected to a pressure integrity test, this should be carried out in accordance with UL 207 or a
corresponding safety standard
without the inclusion of the compressor.
6.4 Evacuation
First evacuate the
system
and then include
the compressor in the evacuation process.
Relieve the compressor pressure.
Open the suction and pressure line shut-off valves.
Evacuate the suction and discharge pressure sides using the vacuum pump.
At the end of the evacuation process, the vacuum should be < 1.5 mbar (0.02 psig) when the pump
is switched off.
Repeat this process as often as is required.
Do not start the compressor if it is under vacuum. Do not apply
any voltage - even for test purposes (must only be operated with
refrigerant).
Under vacuum, the spark-over and creepage current distances of the
terminal board connection bolts shorten; this can result in winding and
terminal board damage.
