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8.3.
External release
The contact for external release is bridged in the delivery state. An external control line can be wired instead
of the bridge. Please refer to
Chapter 6.2.15 Electrical installation
for information on installing the external
release. Fully automatic operation starts with this external release.
8.4.
Control
The chiller's control consists of a control board and a control panel, which communicate with each other via
a BUS connection. The control board operates autonomously so that if the control panel or communication
fails, operation continues to be possible if no other fault prevents operation.
The program, setpoints, parameters and times are stored in an EEprom in the controller and are therefore
retained even in the event of a power failure. Therefore the control does not require a buffer battery. The
buffer battery is only used to keep the clock running.
8.5.
Control panel
The following
Figure 17
shows the chiller's display elements and controls.
Figure 17: C6842 Display and operating modes
Table 12: Description for C6842
Number
Function Key
Function
1
"UP" button
Navigation button
2
"OK" button
Navigation button & acknowledgement button for warning
and fault messages
3
"AB" button
Navigation button & acknowledgement button for warning
and fault messages
4
Display with plain text
5
Main switch
1
2
3
4
5