- 2 -
a hydraulic balance is required on the heating system.
Fig. 5 shows the various hydraulic connection options on the
device. The recommended flow and return connections are
shown in fig. 5 and fig. 4 (below). The heating pipes can be laid
in the floor or in the wall. The device is supplied with two cop-
per pipes with a diameter of 15 mm that are fitted on the heat
exchanger at the factory.
Before and during filling of the heating system, all pipe connec-
tions must be checked for leaks. During filling, the bleeder valve
(see fig. 4) must be open such that air can escape from the de-
vice. If necessary, bleed again following commissioning (circulat-
ing pump running).
Electrical connection
WARNING: The device must be grounded.
WARNING – phase conductor (brown) and neutral conductor
(blue) must not be swapped as this may cause malfunctions.
The electrical connection should have a supply voltage of ~230-
240V, 50 Hz.
The device must be installed by a qualified electrician in compli-
ance with the existing standards and local installation guide-
lines. Before performing installation, ensure that the power
supply is switched off.
The device is equipped with a flexible 1 m connection cable (4 x
0.75 mm²), which can be used to connect the heater directly to
the power supply via a suitable wall socket.
In the electrical supply line, fit a circuit breaker for each pole
with a contact opening width of at least 3 mm. Automatic fuses
are also permitted as separators. Automatic fuses should have a
delayed tripping characteristic.
Conductor configuration of the connection cable:
Brown: 'L' – supply voltage phase conductor
Blue: 'N' – supply voltage neutral conductor
Green/yellow: 'PE' grounding conductor
Black: control conductor (temperature reduction; on/off)
For circuit diagram, see fig. 6.
Control conductor
The black control conductor has the following functions:
Lowering temperature using an external timer or switch
By activating the control conductor, see fig. 6 on the left, the set
target temperature on the device is lowered.
The temperature reduction is forwarded to any downstream
devices via the control conductor.
Operation with programming cassette
The control signals of the programming cassette, which is
plugged into the pilot device, are forwarded to any downstream
devices via the control conductor, see fig. 6 on the right.
The control conductor does not have to be in phase with the
supply connection. If the control conductor is not used, it must
be properly insulated.
WARNING – if you switch over to controlled operation, the
mains voltage is on this conductor!
WARNING – do not ground the control conductor.
When taking out of service, e.g. for maintenance work, ensure
that both the mains supply and the control conductor are dis-
connected from the power supply, because this may result in
external voltage (via a timer contact or pilot device with pro-
gramming cassette).
Final installation
Fit casing cover following completion of installation work. To do
this, screw in the four fixing screws on the underside of the de-
vice, see fig. 2.
Operation
The control panel is shown in fig. 3.
The individual elements have the following meaning:
A – Operating mode button
B – On/off indicator
C – Manual mode indicator
D – Automatic mode indicator
E – Fan level button
F – Low fan level indicator
G – Medium fan level indicator
H – High fan level indicator
J – Thermostat setting wheel
K – Cover for programming cassette slot
Manual operation
Press the
button once or several times until the yellow
indicator lights up.
Press the
button once or several times to select the de-
sired fan level (fan speed). The set fan level is indicated by
the red indicator (1, 2, 3). Set the desired room tempera-
ture with the knob. The set fan level is switched on and off
depending on the room temperature. The temperature re-
duction is forwarded to any downstream devices via the control
conductor.
Automatic mode (eco)
Press the
button once or several times until the red
eco
indicator lights up.
Set the desired room temperature with the knob. Depend-
ing on the current room temperature and the target tem-
perature set on the thermostat, the electronics calculate
which of the three fan levels (fan speeds) to use. The elec-
tronics select the required fan level depending on the dif-
ference between the current room temperature and the de-
sired target temperature.
If necessary, the number of possible fan levels can be reduced.
For instance, to limit the fan levels to a maximum of 2, press
the
button once or several times until the red
2
indicator
lights up.
Operation with a programming cassette or a timer can only take
place in automatic mode (eco). If there is a control signal, the
green
eco
indicator lights up.
Fault indication
If the water temperature is too low, operation of the device is
interrupted and the red
indicator flashes. In this case, check
that the heating system and circulating pump are operating cor-
rectly. For more information, please refer to the "Troubleshoot-
ing" chapter.
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