Service Interface; Operating Conditions; Putting Into Operation And Function; Cleaning And Maintenance - Pfannenberg DTT 6 01 Série Notice D'utilisation Et De Montage

GB
8.3

Service interface

The service interface is only intended for temporary data exchange
and not for continuous operation.
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
accompanying supplement sheet).
• Use the unit such that the cooling capacity suits the actual
demand.
• Use refrigerant as indicated only.
• Use genuine spare parts only.

10 Putting into operation and function

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,
diffe-rent switch cabinet temperatures as well as upper limit temper-
tures can be selected (see accompanying supplement sheet). For
units with Multi-Controller, selection is made from a control unit.
Exceeding the limit temperature generates an alarm.
For units with 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
accompa- nying supplement sheet.
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 evapo-
rator fan continues to run. Compressor and condenser fans
run on as required (the temperature of the switching thresh-
old (T ) has been reached, or are switched off (temperature
set
lower than switching threshold (T

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.
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set
11/40
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 condi-
tions (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.
When 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, General
Information)
It is essential that the refrigerant in the cooling system is properly
removed by suction. Refrigerant emissions must be prevented.