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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 accompanying
supplement sheet.
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 (see Sections
10.4) is run through which ensures a restart-up of the cooling unit
with a time lag.
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 13). In this way a cable
breakage in the fault signalling line is also signalled
10.7 Multimaster – bus
Multi-Controller)
In the multimaster configuration, cooling operation is initiated by
the cooling unit which reaches the operating threshold (T
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-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 in the housing cover or the accompanying
supplement sheet).
The coding options are represented on a display image (Multi-
Controller) or on the circuit diagram (Standard-Controller). Display
image and/or circuit diagram are found on the inside of the service
flap or on the inside of the device hood and are reproduced on the
accompanying supplement 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 Multi-Controller, the lower
temperature limit can also be monitored. See accompanying
supplement sheet for factory settings.
Hint:
The RCM Tool (article no.: 18300000003) can be used in
combination with a PC for optimal maintenance, diagnosis and
unit status monitoring of cooling units with multi-controllers.
RCM means RemoteControlManager and is a Pfannenberg
software package that, with the aid of the data readout head
supplied, allows the following information to be visualised:
- unit data/status
- parameter settings
- temperature recording
- error memory information
Please find more detailed information about the RCM Tool on the
Internet at www.pfannenberg.com.
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.
14
(Optional, only for units with
+ 2K)
setp.
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.
Proceed as follows:
1) Disconnect the cooling unit from the power supply.
2) Remove external cover.
3) Clean heat exchangers.
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.
Hazard!
Wear gloves to protect against injuries while cleaning the
louvres.
• We recommend that the condensate run-off opening be checked
regularly. Take care that the drain hose is installed without kinks.
The fuses for the internal condensate evaporation unit are located
behind the service flap.
CAUTION
After operation of the unit, the evaporator may be hot.
CAUTION:
Protect the electric components against leakage.
CAUTION: 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!
•
In case of cooling units with filters, these have to be cleaned at
regular intervals and replaced when necessary. The intervals for
replacement of the filter mat mainly depend upon ambient con-
ditions (air pollution).
•
If the filter mat is oily or greasy, replace. Please find spare filters
at www.pfannenberg-spareparts.de.
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.
12
Stopping
If the cooling unit is not in use for a longer period, disconnect it.
Ensure that unauthorised persons cannot start the cooling unit.
IWhen the cooling unit is no longer needed, it must be disposed of
by authorized specialist personnel in accordance with all applicable
environmental protection regulations. (see also Section 4, Gene-
ral Information)
It is essential that the refrigerant in the cooling system is properly
removed by suction. Refrigerant emissions must be prevented.
085 408 097a
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