Pfannenberg DTS 3000 Series - Manual (Page 8)

DTS Series Cooling Units
5
As an option, the control voltage can be adjusted to
match the main power supply. Internal to the unit, a
voltage jumper is provided to adjust the transformers
incoming voltage. See technical data sheet included
with cooling unit.
Connect the main power supply to the cooling unit as
indicated by the label located on the cooling unit and
on the individual cooling unit data sheet.
WARNING!
During installation, service technician must
verify and mark voltage as connected on
service cover warning sticker.
Terminal Connections:
4.4 Door contact
To avoid an increased production of condensate
and for safety reasons a door limit switch should be
connected to the terminals provided. The power
supplied to these terminals from the cooling unit is
low voltage (<20V, 20mA).
WARNING!
No external voltage may be applied to the door contact
circuit or damage to the cooling unit may result.
In order to prevent any interference from outside
signals, it is recommended that a shielded cable with
a twisted pair leads be used for the connection. The
cable shielding can be connected on one side to the PE
(ground) connection point provided on the cooling unit.
If the use of a shielded cable is not possible, the cable
that is used must not be routed in the immediate
vicinity of potential sources of interference such as
power supply lines , components with a relatively high
electromagnetic emission (EMI), etc.
If no door contact switch is used, the connecting
terminals must be jumpered for the cooling unit to
operate.
Centralized fault indicator option
To connect the fault signal line there are two
connection terminals available (see the connecting
diagram on the label of the individual cooling unit).
The signal of a fault in the cooling unit is displayed by
the breaking of a potential-free contact.
WARNING!
These connection points may be connected to a
live electrical line with a maximum of 230V, 2 A
SECTION 5: OPERATING CONDITIONS
5.1 Requirements
Before connecting the cooling unit to the power
supply, verify that the following are correct.
Voltage must be within ± 10% of the value listed on
the ID plate.
Voltage frequency must be within ± 3 Hz of the value
listed on the ID plate
Ambient temperature must be below +55ºC (for
options see Section 6.5)
If it ever becomes necessary for servicing, use only the
refrigerant specified on the ID plate and genuine spare
parts only or damage to the cooling unit may result.
Before mounting, make sure that the cooling unit will
have proper ventilation for operation. The cooling unit
must have at least 200mm of clearance between it and
any other surface.
Make sure that the airflow inside of the electrical panel
enclosure is not restricted by internal components.
Enclosure
Cooling
Unit
Wall
8”
(200 mm)
WARNING!
If the cooling unit is being mounted on the door of
the electrical panel enclosure, it must be confirmed
that the door hinges can support the additional
weight of the cooling unit and that the electrical
panel enclosure is securely fastened so that the
panel enclosure will not topple over.