085 408 076a
11
Danger!
Burr caused by production may be present on the metal
edges of the unit. Always wear protective gloves when car-
rying out maintenance work and installation.
In case of a warranty claim exact details on the fault (photo-
graph, if possible) and the indication of type and serial num-
ber of the cooling unit are required.
3
Scope of delivery and options
3.1
Scope of delivery
The Scope of delivery includes:
• cooling unit (with connection for door contact switch)
• Enclosed package (among other things sealing profile,
fastening material, electrical plug-type connectors)
• special accessories, if applicable.
3.2
Options
The following parts may be ordered separately:
– further options on request or in accordance with the catalogue.
4
General Information
• Old devices can be properly disposed of by Pfannenberg. They
must be sent to one of our works shipment/postage paid.
• All cooling units produced by
Pfannenberg
are free from
–
siliconecompounds,
–
PCB,
–
PCT,
–
asbestos,
–
formaldehyde,
–
cadmium,
–
substances impairing wetting.
• Every cooling unit is checked to ensure that it is tight.
• Prior to delivery the electrical safety of every cooling unit is
factory tested.
5
ID Plate and Technical Data
For installation and maintenance, note the data on the ID plate; it is
to be found on the back of the cooling unit casing
The technical details applicable to the cooling unit are in the Techn.
data sheet.
6
Safety
Cooling units produced by
Pfannenberg
are designed for dissipating
heat from switch cabinets (IP 54). During each cooling process
condensate can be produced. The cooling unit is only suitable for
stationary operation.
The cooling unit may only be used under the ambient conditions
specified on the Techn. data sheet.
The cooling unit is to a large measure maintenance-free (see Section
11).
Every other use is considered as non-authorized use making any
warranty null and void.
The electrical equipment must be regularly checked. Any faults such
as loose connections or scorched cables must be removed
immediately.
Work on the cooling system and on electrical components may only
be carried out by authorized specialist personnel.
Compliance with applicable safety and environmental regulations
is mandatory.
Hazard!
Isolate the cooling unit from the mains before carrying out
any cleaning or maintenance operations.
Only original spare parts may be used.
7
Function
7.1
Principles of function
1
Compressor
2
Heat exchanger
(condenser)
3
Expansion valve
4
Heat exchanger
(evaporator)
5
fan, exterior circulation
6
fan, inner circulation
7
Electronic control system with temperature sensor
The compressor (1) compresses the refrigerant until high pressure
is achieved. During this process temperature increases. In the
condenser (2) heat is dissipated to ambient air, the coolant becoming
liquid. The condenser fan (5) of the condensator takes ambient air
in through the condenser, then it releases the air.
In the expansion valve (3) the pressure of the coolant drops. In the
evaporator (4) the coolant absorbs heat from the air in the switch
cabinet and evaporates. Thus, the air in the switch cabinet cools
down. At the same time the air inside the switch cabinet is being
dehumidified. The evaporator fan (6) sucks the air out of the switch
cabinet via the evaporator, the cooled air flows back to the switch
cabinet.
The cooling unit is electronically controlled. For that purpose a
temperature sensor records the temperature of the air inside the
switch cabinet (7).
The refrigerant is not detrimental to the ozonosphere; it is hardly
combustible.
7.2
Condensate
During cooling on the evaporator the moisture removed from the air
is collected as condensate. In order to avoid any damage to the
switch cabinet and the cooling unit, the condensate must be
discharged.
The condensate is discharged in the following way:
• In case of normal condensate drainage a reservoir collects the
condensate which is then drained by means of a hose.
Always ensure that the condensate is drained properly (safety-
drainage).
Excessive condensation can occur if, for example, the switch
cabinet is not sealed or if the internal temperature of the switch
cabinet is frequently below the dew point.
unit type
refrigerant
nominal voltage
pressure of
refrigerant
frequency
serial number
type of fusing
fusing
electrical
energy
exterior/interior
conditions
cooling
capacity
starting
current
nominal current
