83003702.K Operating Instruction
Type KPC 108-L-U/S
page 11
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Brief operating instructions
3.1
Installing, maintenance and repair
Only qualified operatives with the requisite knowledge, equipment and facilities should maintenance and repair the
industrial cooler.
If its necessary to change the filling weight of the refrigerant circuit, please note:
Fill only with the refrigerants listed on the manufacturer name plate, and only up to the indicated filling weight.
OBSERVE THE SAFETY RULES
Before work on the industrial cooler, switch the plant to voltage-free and make sure against unauthorized switching
ON.
3.2
Linking to power supply
The size of the connection cable had to be conform to the local regulations. For current values and power input see
Switch Gear.
The industrial coolers of the KPC series are generally designed for a main supply of 480V 3Ph 60 Hz.
The connection L1, L2, L3, PE is performed via the terminal block in the switch box.
The cooling block is switched on via the master switch .
3.3
Filling the unit with cooling medium
The cooling circulation will be filled with cooling medium (mixture of 62 % clean water – drinking water quality – and
38 % glycol).
Open front panel and fill to a pressure of 1,5 bar via the feed cock.
After filling, check all connections for leakage.
3.4
EMC Compatibility and Grounding
This comments are compiled to help the field electrician to install the grounding of the power supply and to get a EMC
Compatibility.
All electrical equipment produces radio and line-borne interference at various frequencies. The cables pass this on to
the environment like an aerial.
The basic countermeasures are isolation of the wiring of control and power components, proper grounding and
shielding of cables.
A large contact area is necessary for low-impedance grounding of HF interference. The use of grounding straps
instead of cables is therefore definitely advisable.
Moreover, cable shields must be
connected with purpose-made ground
clips.
The grounding surface must be highly
conductive bare metal. Remove any
coats of varnish and paint.
The width of the grounding wire must be min. 16mm² (AWG 6) or of the same width of the power supply.
The grounding must be an isolated ground and must connected on the ground terminal (X1) in the switch cabinet.
The ground resistance must be less than 10 Ohm.
