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© STULZ GmbH – all rights reserved EN/09.2019/G41
cybercool 2 screw original insTrUcTions
The sensor of the anti-freeze thermostat is an immersion sensor
which gets directly in contact with the cold water. The control unit of
the anti-freeze thermostat is housed in the control cabinet.
The yellow LED K1 lights up during normal operation.
Below the set value the frost protection mode is triggered and the
LED goes out. Above the set value plus the hysteresis, the frost pro-
tection mode is cancelled and normal operation is continued.
Factory setting
Setpoint: 4 °C
Controller type "typ": Col
Hysteresis: 5 K
Sensor type "SEn": P.It
Lead compensation resistance "OF.r": 0,3
Operation
During operation, the measured value of the chilled water tempera-
ture will be shown.
Setting the setpoint:
• Press the "P" key. The set value and "SP" will be displayed
alternately.
• Adjust new setpoint by the
and
keys.
• Press "P" key to return to the display of the actual value.
The hysteresis is fixed to 5 Kelvin.
or
time-out aft
er
appr
ox. 30 sec.
Display of actual value
Display
LED K1
Frost protection thermostat
The electronic expansion valve is supported by a rechargeable battery located in the chiller‘s electrical box,
which is used to close the valve in the event of a power failure.
Full operation of the electronic expansion valve is only guaranteed by a charged battery.
The battery must be recharged after the following events:
• long interim storage of the chiller without connection to a power supply
• a longer power failure (longer than 1 week)
• replacement of the battery
For charging, the chiller must be supplied with power 3 hours before the refrigeration circuits are put into ope-
ration. To do this, switch on the main switch and the control fuses. Do not start the regulation (e.g. by pressing
the red start/stop button on the C7000AT). The control must remain switched off.
After the expansion valve has been closed using the battery (e.g. after a brief power failure), a charging time of
one hour is required to restore full operation of the expansion valve.
Note:
The oil pre-heating time is largely sufficient to recharge a battery which is possibly discharged. For this the
control fuse of the controller must be switched on.
