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8.7.9.
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.
Execution types
Basically, you can choose between two types of construction:
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.
9.
Cleaning
9.1.
Air filter mat
To maintain high performance the optional air filter mat (
3.19 Air filter mat
) must be checked for contamination
at least once a month. The correct air filter mats can be ordered at any time as an original spare part – please
contact our KKT chillers Service Team (
Contact
details
).
9.2.
Condenser
To maintain high performance, the Microchannel heat exchanger should be cleaned when visibly soiled, or
at least once a year. For this purpose, disconnect the unit from the power supply and remove the service
plates as well as the condenser protection grid (plates 3 and 5, see chapter
1.2 Elements
). Remove first any
coarse dirt particles from the outside with a commercial vacuum cleaner. Then carefully rinse the
Microchannel heat exchanger from the inside against the air flow direction with warm tap water. Then clean
with a wet vacuum cleaner until the surface is dry again. For versions with water-cooled condenser see
Complete cleaning of the cold water circuit.
9.3.
Water filter
If the existing water quality (dirt load) Chapter 2.17 Water quality as well as the required water circulation
quantity differ, a water filter must be used. (
3.23 Filter assembly group coolant circuit
) It must be checked for
contamination at least once a month. The appropriate filter unit can be ordered as an original spare part at
any time – please contact our KKT chillers Service Team for this (
Contact
details
).
9.4.
Complete cleaning of the cold water circuit
Due to the complexity and diversity of the possible external materials, we recommend that the complete
cleaning of the cold water circuit only be carried out by qualified personnel – please contact our KKT chillers
Service Team (
Table 1 Contact
details
).