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8. Operation
The chiller is designed for fully automatic operation.
8.1. Switching on
First, switch on the machine at the main switch (component 5 in Figure 19: C6842 Display
elements and controls). The Start screen appears on the display.
8.2. Selecting the operating mode
In the Start screen you can choose between the following three operating modes:
▪ Standby operating mode
If you select " STANDBY " mode, all electrical components except the compressor heater
are switched off.
This operating mode is to be selected if the chiller was disconnected from the power
supply in ambient temperatures <5°C for longer than 6 h. In this case the compressors
must be preheated for 3 h, so that the refrigerant can escape from the oil.
▪ AUTO
With the selection of "AUTO" operating mode the machine is ready for use. The fully
automatic operation only starts in this mode if the external release has been installed
beforehand as described in Chapter 8.3 External release.
▪ ON
Fully automatic operation (without external release) starts with the selection of "ON"
mode.
8.3. External release
Wiring of the contacts for external release can be performed with an external control cable with a
potential-free switch. Please refer to Chapter 6.2.18 Electrical installation for information on 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, target / setpoint values, parameters and times are stored in an Eprom in the
control and are therefore retained even in the event of a power failure. Therefore the control does
not require a buffer battery.
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