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Warning!
Ambient conditions and temperature in the switch cabinet
must be in accordance with the values indicated in the sup-
plement.
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.
fans run on as required (the temperature of the switching
Ithreshold (T
) has been reached, or are switched off
set
(temperature lower than switching threshold (T
• Free discharge of any condensate produced must be provided
to ensure trouble-free operation.
10.2 Indicator elements
The cooling unit has an operational display in the form of a LED on the
external hood of the unit. If the light of this indicator remains on when
the supply voltage is applied it shows that the unit is in the normal
operating mode. If a fault occurs or if the unit is in the start-up or test
mode, this indicator lights up in various flashing sequences which
make it easier to diagnose fault in the unit (see Sections 10.4 and 13)
10.3 Test mode / start-up
The test mode is basically activated after renewed connection of
the supply voltage and is independent of the instantaneous ambient
conditions when the door contact is closed.
First of all the unit runs through a start-up mode lasting 30 seconds
which is followed by a test mode lasting 30 seconds.
10.4 Unit characteristics
Modus
Time curve Characteristics
Start-up
t = 0s - < 30s No function
mode
t = 30s
t = 32s
Test mode
t >34s – 64s
The start-up mode is always additionally activated when the door
limit switch is closed
(see Sections 10.5)
10.5 Door contact
To avoid an increased production of condensate and for safety
reasons a door limit switch should be connected to the terminals
provided (see circuit diagram (housing cover) or supplement)
By the opening of the switch cabinet door and thus the opening of
the switch all of the motors of the cooling unit are immediately
switched off. After closing of the door the start-up mode
Sections 10.4)
is run through which ensures a restart-up of the
cooling unit with a time lag.
14
Compressor and condenser
).
set
Internal fan start up
External fan and
compressor start up
Flashing sequence of the
status indicator:
"off-dark-light-dark-off".
Fault signal contact is closed.
Compressor and fans
remains in operation during
the period. Flashing sequence
of the status indicator:
"off-dark-light-dark-off".
Fault signal contact is open.
Should a fault arise during
the test mode, the unit goes
into the fault mode and the
status indicator lights up
according to the fault state
(see chapter on Fault
diagnosis)
(see
10.6 Centralised fault indication
The signalling of a fault in the cooling unit is effected by the breaking
of a potential-free contact
(see Sections
breakage in the fault signalling line is also signalled
10.7 Multimaster – bus
fort- or Multi-Controller)
In the multimaster configuration, cooling operation is initiated by
the cooling unit which reaches the operating threshold (T
2K) first. All of the cooling units connected to the multi-master bus
switch to cooling operation. The cooling mode is terminated by the
unit which is the last to go below the operating threshold
(T
- 2K).
setp.
10.8 Setting possibilities
By means of a DIP switch (Standard- and Comfort-Controller) or
from a display and control unit (Multi-Controller), various switch
cabinet temperatures as well as limit temperatures can be selected.
The location of the DIP switch on the control board is shown in
the circuit diagram.
The coding options are represented on a display image (Comfort-
and Multi-Controller) or on the circuit diagram (Standard-
controller). Diagram and/or wiring diagram are stuck on the
inside of the unit hood and shown on the enclosed sheet.
Starting with a particular set-temperature in the switch cabinet,
an upper limit temperature can be selected which, if exceeded,
will generate an alarm. On units with Comfort- or Multi-Controller,
the lower temperature limit can also be monitored. See
accompanying sheet for factory settings.
CAUTION: Changes to the parameters of the unit set in
the works may be made only by authorised persons!
Isolate the cooling unit from the mains before changing
the DIP-switsch settings. Otherwise the modified settings
won't be accepted.
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.
Warning! Damage to electric connections on the
covering hood
If the covering hood is removed, the electric plug-in
connections 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 replacement of
the filter mat mainly depend upon ambient conditions (air pollution).
13). In this way a cable
(Optional, only for units with Com-
085 408 067
+
setp.
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