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8.7.6. Electronic expansion valve control
An electronic expansion valve with PI controller is used to keep the overheating constant. To
prevent the maximum operating pressure (MOP) from being exceeded, a P controller is used,
which counteracts when the MOP is approached and limits opening of the electronic expansion
valve.
8.7.7. Temperature limit monitoring
The temperature of the cold water feed is monitored for a minimum and maximum limit value if
the chiller is switched on (pump is running). If the limit value is exceeded or the minimum is not
reached, an alarm is triggered with time delay, which switches off the chiller.
8.7.8. Group fault alarm
A group fault alarm is triggered if an alarm occurs. All alarms are included in the group fault, but
not the warnings. The group fault signalling relay has a floating changeover contact and is
energised in fault-free operation, in order to ensure wire break monitoring.
8.8. Operating modes
It is possible to choose between two operating modes:
8.8.1. ECO mode
The default setting of the Compact-Line provides for operation in ECO mode ("Run" parameter is
set to "0"). As a result, the increase in fan speed reduces the condensing pressure to the
minimum necessary value in the respective operating point – the electrical power consumption of
the overall system is limited to a minimum.
8.8.2. Comfort mode
In case of strict sound emission requirements the fan speed can be reduced to the minimum
necessary value in the respective operating point and sound power level limited to a minimum. To
do this the "Run" parameter must be set to "1". As a result of the lower air flow rate a reduced
output of around 3% is to be expected.
The optimised parameter list for your application is enclosed with the unit.
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