CYBERHANDLER 2 INSTALLATION, OPERATION AND MAINTENANCE MANUAL
EN/05.2019 © STULZ GmbH – all rights reserved
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The unit must be installed and connected in accordance with the chapter on
“installation” before initial commissioning.
Do not turn the adjustment screw beyond the end of the calibrated scale range, as it
may result in overheating and short-circuit at the consumer or in the destruction of
the power switch.
The doors can only be opened with the key provided and represent a protective
device. During operation the doors may not be opened and the rear panels may not be
removed.
Oil dilution! Bearing malfunction!
• Make sure that the master switch is off and the unit is de-energized.
• Open the electrical compartment door of the unit using the key provided.
• Check whether all power switches and control-circuit fuses in the electrical section of the unit
are switched off.
• Retighten all screw connections in the electric cabinet.
• Verify the smooth function of the contactors.
• Adjustment of the power switches according to electrical data sheet.
• Switch on the control-circuit fuses and the power switches of the fan and the compressor in
sequence.
• Close all doors of the Air handling unit.
• Switch on the CyberHandler2 unit at the master switch.
The controller is now supplied with power, so you can use it for adjustments.
Make sure that the heat rejecting system is operating.
DXR:
Condenser
CWT/CWR:
Chiller
• Adjust the desired return air temperature at the controller.
• It is important to ensure that new compressors are not subjected to liquid abuse. If the
compressor is equipped with a crankcase heater, turn it on 12 hours before starting the
compressor.
• Start the A/C unit by pressing the Start/Stop-key on the controller.
• Check after 20 minutes operation, whether bubbles are visible in the sight glass of the liquid
line. If this is the case, refrigerant might have escaped by a leak. Check the circuit on leaks,
eliminate these and top up the circuit with refrigerant in regard of the chapter “Maintenance”.
• Check the oil level at the compressor in respect of the right level.
• The oil level should be between the lower quarter and the middle of the sight glass.
7 1
Refrigerant circuit
7 Commissioning
