4
Rittal air/water heat exchanger assembly instructions
3 Device description
EN
3
Device description
Depending on the model chosen, your air/water
heat exchanger may vary in appearance from the
illustrations contained in these instructions.
However, the functions are identical in principle.
Fig. 1:
Device description
Key
1
Cover
2
Display (controller)
3
X1 terminal strip (unit rear)
4
X2 master/slave connection (e-Comfort controller)
5
X3 optional serial interface (unit rear)
6
Potential equalisation
7
Rating plate
8
Cooling water inflow (underside of the unit)
9
Condensate discharge (underside of the unit)
10
Cooling water return (underside of the unit)
11
Dispatch bag
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 up to +70°C where comparable units, such
as air/air heat exchangers, enclosure cooling units or
fan-and-filter units, cannot be used for system rea-
sons to effectively and economically dissipate heat
loss. The air/water heat exchanger may be externally
and internally mounted on all enclosure outer walls.
3.1.1 How it works
The air/water heat exchanger comprises of the follow-
ing main components (cf. fig. 2): Heat exchanger
package (1), fan (2), magnetic valve (3), temperature
control (4) and non-return valve (5).
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 (2) 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 magnetic valve (3)
controls the cooling output by changing the water
flow volume depending on the required setpoint
temperature and the water inlet temperature.
3.1.2 Control
Rittal air/water heat exchangers are fitted with a
controller for setting the functions of the heat ex-
changer. Depending on the design, this is either
a Basic controller or an e-Comfort controller (display
plus extended functions, see chapter “6 Operation”,
page 13).
3.1.3 Bus mode (e-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. 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 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”.
(See also chapter “6.2.9 Setting the master-slave
identifier”, page 21).
8
7
1
9
10
3
4
5
4
5
6
11
2
Cooling water return
Magnetic
valve (3)
Tempera-
ture control
(4)
Cooling water inlet
Non-return
valve (5)
(for units with
e-Comfort
controller
only)
Fan (2)
Heat
exchanger
(1)
