CYBERHANDLER 2 INSTALLATION, OPERATION AND MAINTENANCE MANUAL
EN/05.2019 © STULZ GmbH – all rights reserved
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Before filling the compressor with refrigerant, make sure the unit is connected to
power supply
Connection points of the refrigerant circuit must be carefully checked, because most
of the leaks are located in these areas.
• Repair all the detected leaks and check the circuit again until the tightness is OK.
Vacuum and filling of refrigerant circuit
Fig 6-14: refrigerant circuit diagram
The nitrogen used the for tightness test must be removed from the refrigerant circuit
Evacuating refrigeration circuit:
• Connect a vacuum pump and manometer to the refrigeration circuit.
• Operate the vacuum pump until the pressure value of 70 mbar is reached.
• Wait for 30 minutes and check if the pressure keeps constant. If the pressure has increased,
it indicates there is a possible leak in the circuit. In this case, the leak must be detected and
repaired and the evacuation procedure must be started again.
• If the pressure keeps constant, fill refrigerant (R410A) until the pressure value of 0.98 bar is
reached (to break the vacuum)
• Wait for 5 minutes and remove the refrigerant from the circuit.
• Operate the vacuum pump again in order to realize a last evacuation.
