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EN/05.2019 © STULZ GmbH – all rights reserved
CYBERHANDLER 2 INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Terminal Assignation
Use
3
0V
RS485/ModBus®
connection
4
RX+/TX+
5
RX–/TX–
6
PTC input
not used
7
24VDC
auxiliary voltage
8
0V
9
STOa
input for HP alarm
10
STOb
1,2
Relay output
not used
In case of μPC electronic board replacement or updating of the software the inverter must be
configured according to a specific procedure (available on request).
Inverter configuration must be realized by trained personal only.
Expansion valve
The refrigerant circuit is equipped with an electronic expansion valve, which controls the
superheating in the evaporator.
The superheating is adjusted to 7 K at the factory and may not be modified. The expansion
valve can freeze, if the humidity in the system is excessive.
Do not thaw by soldering flame, danger of explosion! Thaw with moist warm cloth
Check the sightglass
8 9
Unit housing
Clean the unit casing with a microfiber cloth with lukewarm water (possibly add a neutral soap
solution). Panels can be removed for replacement.
