Unit Characteristics; Door Contact; Centralised Fault Indication; Setting Prossibilities - Pfannenberg DTS Serie Instrucciones De La Instalación Y Del Uso

10.4

Unit characteristics

Modus Time curve
Start-up t = 0s - < 30s
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.

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 Setting possibilities
By means of a DIP switch 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 the circuit diagram. The
circuit diagram is stuck to the inside of the device hood and is
reproduced on the accompanying 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. 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.
14
Characteristics
No function
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 13.2)
(see
13). In this way a cable
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
IIf the covering hood is removed, the electrical plug-in
connections on the inside must be removed by hand. Do
not forget to plug in when refitting!
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 065f