3 Device description
EN
4
Rittal enclosure cooling unit
Fig. 1:
Device description
Key
1
Enclosure
2
Air outlet holes
3
Rating plate
4
Louvred grille for air inlet
5
Display
6
X2 master-slave connection (underside of the unit)
7
X1 terminal strip (underside of the unit)
8
X3 optional serial interface (underside of the unit)
9
Dispatch bag
10
Twin-threaded bolt
11
Condenser
12
Condensate discharge
3.1
TÜV-tested output measurement to
DIN EN 14511
All TopTherm cooling units in the output range from 300
to 4000 W are tested to the latest EN 14511-1-4:2013-
12 standard by independent test institute TÜV Nord.
This means you have peace of mind about the design of
the climate control solution and you can be sure you are
getting the performance you are paying for.
3.2
Functional description
Enclosure cooling units are designed to dissipate heat
from enclosures by cooling the air inside the enclosure
and so protect the temperature-sensitive components.
It is mounted on the roof of an enclosure.
3.2.1
How it works
The cooling unit (compression refrigeration system)
comprises four main components (see fig. 2): the evap-
orator (1), the refrigerant compressor (2), the condenser
(3), and the control or expansion valve (4), which are
connected by suitable pipework.
This circuit is filled with a readily boiling substance, the
refrigerant. The refrigerant R134a (CH
2
FCF
3
) is chlorine-
free. Its Ozone Depletion Potential (ODP) is 0, making it
very eco-friendly. A filter dryer (5) which is integrated into
the hermetically sealed cooling circuit provides effective
protection against moisture, acid, dirt particles, and for-
eign bodies within the cooling circuit.
Fig. 2:
Cooling circuit
In the evaporator coil (1), the liquid refrigerant is convert-
ed to a gaseous state. The energy needed for this pur-
pose is taken from the enclosure air in the form of heat,
which has the effect of cooling the enclosure air. In the
compressor (2), the refrigerant is heavily compressed,
so that it achieves a higher temperature inside the con-
denser (3) than the ambient air. This means that excess
heat may be emitted to the ambient air via the surface of
the condenser, as a result of which the temperature of
the refrigerant drops and it is converted back into liquid.
It is re-injected into the evaporator coil via a thermostatic
expansion valve (4), which causes it to cool down fur-
ther, and is then once again able to absorb the energy
from the enclosure air in the evaporator coil. The whole
cycle begins again.
3.2.2
Control
Rittal enclosure cooling units are fitted with a controller
for setting the functions of the cooling unit (display plus
extended functions, see section 6 "Operation").
3.2.3
Bus mode (e-Comfort controller only)
The serial unit interface X2 allows you to create a bus
connection with up to ten cooling units using the master-
slave cable (shielded, four-wire cable, Model No.
3124.100). This allows you to implement the following
functions:
– Parallel unit control (the cooling units in the network
can be switched on and off simultaneously)
– Parallel door status message ("door open")
– Parallel collective fault message
Data is exchanged via the master-slave connection.
During commissioning, assign an address to each unit
that also includes the identifier "master" or "slave".
3
6, 7, 8
12
4
11
10
9
5
2
1
PSA
H
pressure
switch
Condenser fan
Expansion valve (4)
Temperature
control
Filter dryer (5)
Internal circuit
Compressor (2)
External circuit
Evaporator fan
Evaporator coil (1)
Condenser (3)
Содержание Rittal 3273 Series
Страница 31: ......
