3 Device description
Rittal air/water heat exchanger assembly instructions
5
EN
3
Device description
Depending on the model chosen, your air/water heat
exchanger may vary in appearance from the illustra-
tions contained in these instructions. However, the
functions are identical in principle.
Fig. 1:
Device description
Legend
1
Cover
2
Rating plate
3
Display
4
X2 master-slave connection (Comfort controller)
5
X1 terminal strip (underside of the unit)
6
X3 optional serial interface (underside of the unit)
7
Dispatch bag
8
Cooling water inlet
9
Cooling water return
10
Condensate discharge
3.1 Functional description
Air/water heat exchangers are designed and built to
dissipate heat from enclosures by cooling the air in-
side the enclosure and so protect the temperature-
sensitive components. Air/water heat exchangers
are particularly appropriate for the temperature
range of +40°C to +70°C where comparable units,
such as air/air heat exchangers, enclosure cooling
units or filter fans, cannot be used for system rea-
sons to effectively and economically dissipate heat
loss. It is mounted on the roof of an enclosure.
3.1.1 How it works
The air/water heat exchanger comprises of three
main components (cf. Fig. 2): Heat exchanger
package (1), fan (2) and the magnetic valve (3)
connected with each other using pipes.
Fig. 2:
Air/water heat exchanger
The heat loss of the enclosure is dissipated in a
membrane heat exchanger to the water coolant.
A fan blows the internal enclosure air over the heat
exchanger (1); except for the inlet and outlet water
and the condensed water discharge, the unit is
closed to the environment.
The flow regulator (3) controls the cooling output by
changing the water flow volume depending on the
required housing temperature and the water inlet
temperature.
3.1.2 Control
Rittal enclosure air/water heat exchangers are fitted
with a controller for setting the functions of the heat
exchanger. Depending on the design, this is either a
Basic controller (display of the operating status via
LED) or a Comfort controller (display plus extended
functions, see chapter “6 Operation” page 18).
3.1.3 Bus mode (Comfort controller only)
The serial unit interface X2 allows you to create a bus
connection with up to ten air/water heat exchangers
using the master-slave cable (shielded, four-wire
cable, Model No. SK 3124.100). This allows you to
implement the following functions:
– Parallel unit control (the air/water heat exchangers
in the network can be switched on and off simulta-
neously)
– 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”.
2
4, 5, 6
9
7
3
1
10
8
Cooling water
return
Magnetic valve (3)
Temperature
control
Cooling water
inlet
Internal circuit
External circuit
Fan (2)
Heat exchanger (1)
Summary of Contents for SK 3209. Series
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