085 408 164
11
sions are to be taken into account).
7) Connect the cooling unit to the power source (see section 8.4).
8.4 Power connection
CAUTION:
• The cooling unit must be connected to the mains by means of a
disconnecting device with a contact gap of at least 3 mm when
switched off.
• No temperature control must be series-connected to the cooling
unit feed.
The fuse as indicated on the ID plate must be series-connected
as line protection.
• Power connection and repairs, if applicable, may only be car-
ried out by authorized trained electricians.
Power supply connection (mains):
Both mains voltage and frequency must correspond to the nominal
values indicated on the ID plate of the cooling unit.
• The installation of the power cable is not subject to any special
requirements
Attention: The cooling unit may be damaged if the
voltage is too high.
Refers to cooling units for nominal voltages 400 V/440V.
As an option, some units, different to the standard (400
V/440 V), may be connected to a different mains voltage (For
voltage range see enclosed sheet).The feed cables on the
transformer primary must be unclamped for this.
Attention! The cooling unit may be damaged due to
incorrect direction of rotation.
Before switching on the unit, check the phase sequence of the
three-phase supply in order to prevent damage to the compres-
sor. Direction of rotation must be to the right (clockwise).
9 Operating Conditions
• Voltage must be within ± 10 % of the value indicated.
Frequency must be within ± 3 Hz of the value indicated.
• Ambient temperature must be below 55 °C (for options see
supplement).
• Use the unit such that the cooling capacity suits the actual de
-
mand.
• Use refrigerant as indicated only.
• Use genuine spare parts only.
10 Putting into operation and function
10.1 General remarks
The cooling unit is provided with an electronic control system. The drawn-
in switch cabinet internal air temperature is measured by a temperature
sensor. By means of a DIP switch on the control board, different
switch cabinet temperatures as well as upper limit temperatures can
be selected (see accompanying sheet). For units with Multi-Controller,
selection is made from a display and control unit.
Exceeding the
limit temperature generates an alarm. For units with Comfort- or
Multi-Controller, the lower temperature limit can also be monitored.
Warning!
Ambient conditions and temperature in the switch cabinet must
be in accordance with the values indicated in the supplement.
Warning! Too little heat transfer at the heat exchanger
in the external circuit (condenser).
The cooling unit may only be operated with cover, otherwise
heat dissipation at the condenser is not sufficient, and the
cooling unit may be damaged.
Immediately after the switch-on of the service voltage, the
unit goes into the start-up/test mode. After that the evaporator
fan continues to run. Compressor and condenser fans run
on as required (the temperature of the switching threshold
(T
set
) has been reached, or are switched off (temperature
lower than switching threshold (T
set
)).
• Free discharge of any condensate produced must be provided
to ensure trouble-free operation.
11 Cleaning and Maintenance
Hazard!
Isolate the cooling unit from the mains before carrying out
any cleaning or maintenance operations.
11.1 Cleaning
The cleaning intervals depend upon the relevant operating conditions.
In particular observe the following instructions.
• Clean the heat exchanger regularly.
• Clean the heat exchanger using a soft brush or pressurized air.
• We recommend that the condensate run-off opening be checked
regularly.
Proceed as follows:
1) Disconnect the cooling unit from the power supply.
2) Remove external cover.
3) Clean heat exchangers
CAUTION:
Protect the electric components against leakage.
CAUTION: Damage to louvres
Do not use any pointed or sharp-edged objects. The ribs
should not be compressed or damaged during the cleaning
process.
CAUTION: Damage to electric connections on the
covering hood
If the covering hood is removed, the electric plug-in connec-
tions on the inside must be removed by hand. During fitting
do not forget to plug-in!
• If the cooling units are provided with a front filter clean the filter
mat regularly. The cleaning intervals or the intervals for replace-
ment of the filter mat mainly depend upon ambient conditions (air
pollution).
• You can rinse the filter mat using water heated to 40 °C and
commercially available mild detergent. It is possible to remove
any dry dirt by knocking the mat slightly, vacuum cleaning it or
blowing it out.
CAUTION: Damage to the filter mat.
Do not wring the filter mat. Avoid too solid a water jet.
• If the filter mat is oily or greasy, replace.
11.2 Maintenance
The cooling circuit, as a maintenance-free, hermetically sealed closed
system, is filled at the factory with the necessary coolant, checked for
leakages and is subjected to a functional check run. The cooling unit
is largely maintenance-free. The components around the external air
circuit require maintenance and cleaning depending upon the ambient
conditions (see Section 11.1).
After each service, the full performance capacity of the condensate
run-off should be checked.