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- lead cross-section: 0.5 – 2.5 mm², and/or AWG20 – AWG14
(for the selection of the cable cross-section the relevant provi-
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 Techn. data 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
compressor. Direction of rotation must be to the right (clockwise).
Door contact:
The door contact is supplied form the cooling unit with an extra-low
voltage (<20V, 20 mA).
•
In order to avoid any disruptive influences, it is recommended
that a sheathed cable with twisted pair leads be used. The screen
can be secured on one side to the PE connection point provi-
ded on the cooling unit.
•
If the use of sheathed cables is not possible, during installation of
the cables it must be ensured that they are not routed in the imme-
diate vicinity of potential interference sources (e.g. supply lines, com-
ponents with relatively high electromagnetic emission).
WARNING: No external voltage may be applied.
If no door-contact switch is used, the connecting contacts
are to be bridged.
Centralised fault indication:
For connection of the fault signal line there are 2 connection contacts
and/or connecting lines available (see circuit diagram on the Techn.
data sheet)
The installation of the fault signal line is not subject to any special
requirements.
085 408 075b
WARNING: The contact may be loaded with
max. 230 V, 1A.
Multimaster:
(Optional, only for units with Comfort or Multi-
Controller)
To connect the multimaster cables there are in each case 2
connecting contacts (input and output-end) available (see connecting
diagram on the rear of the housing).
The contacts are supplied with low voltage (< 20 V, 20 mA) from the
cooling unit.
WARNING: No external voltage may be applied.
•
In order to avoid any disruptive influences, it is recommended
that a sheathed cable with twisted pair leads be used. The she-
ath can be connected at both ends to the PE terminal provided
on the cooling unit for the purpose.
•
If the use of sheathed cables is not possible, during installation of
the cables it must be ensured that they are not routed in the imme-
diate vicinity of potential interference sources (e.g. supply lines, com-
ponents with relatively high electromagnetic emission).
• A maximum of 20 units may be controlled over the bus.
Block diagram of the Multimaster wiring
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.
•
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 Techn. data sheet). For units with Multi-Controller,
selection is made from a display and control unit. Exceeding
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 Techn. data
sheet.
Warning! Too little heat transfer at the heat exchan-
ger in the external circuit (condenser).
The cooling unit may only be operated with cover, otherwi-
se 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 evapo-
rator fan continues to run. Compressor and condenser fans
run on as required (the temperature of the switching thres-
hold (T
) has been reached, or are switched off (tempera-
set
ture lower than switching threshold (T
• Free discharge of any condensate produced must be provided
to ensure trouble-free operation.
the
)).
set
13
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