Power Connection; Operationg Conditions; Putting Into Operation And Function; General Remarks - Pfannenberg DTD Serie Instrucciones De Instalación

6) Install the condensate drainage hose which must be inclined
downward and ensure free drainage!
7) Connect the cooling unit to power supply (see section 8.5).
8.5

Power connection

CAUTION:
• The cooling unit must be connected to the mains by means of
a
contact gap of at least 3 mm when switched off.
• No temperature control must be series-connected to the
cooling
• The fuse as indicated on the ID plate must be series-con-
nected
• 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 enclosed 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 shielded cable with twisted pair leads be used. The
shield can be connected at one end to the PE terminal and/or PE
line 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
immediate vicinity of potential interference sources (e.g. supply
lines, components with relatively high electromagnetic emission).
085 408 067
disconnecting device with a
unit feed.
as line protection.
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
Technical Data Sheet)
The installation of the fault signal line is not subject to any special
requirements.
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
diagram on the Technical Data
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
sheath can be connected at both ends to the
PE line 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
immediate vicinity of potential interference sources (e.g. supply
lines, components with relatively high electromagnetic emission).
• A maximum of 20 units may be controlled over the bus.
Block diagram of the Multimaster wiring
Unit with terminals:
Unit with cable ends:
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
supplement).
• 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

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 accompanying sheet).
For units with Multi-Controller, selection is made from a display
and control unit. Exceeding the limit temperature generates an
alarm. For units with Comfort- or Multi-Controller, the lower
temperature limit can also be monitored.
(see circuit
Sheet).
PE terminal and/or
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