Electrical installer
24
4
How to connect the power supply
To connect the three-pole power supply cable:
1.
Access the electronic board according to Procedure
4.2
2.
Connect the three wires to the electronic board as
shown in Figure 4.1
3.
Provide the earth lead-in wire longer than live ones
(last to be torn in the event of accidental pulling).
Figure 4.1
Appliance connection to the mains power supply
L
Phase
N
Neutral
Components NOT SUPPLIED:
GS Two-pole switch
230 V ~ 50 Hz
N
L
GND
GS
X1
4.4
CONTROL SYSTEM
4.4.1
Positioning the control system
Install the chronothermostat according to the following
guidelines:
▶
At about 1,5 m from the floor, protected against air
draughts, direct exposure to sun rays and direct heat
sources (lamps, hot air flow from the unit itself, etc.).
▶
If possible, do not place the control system on walls
bordering the outside, to avoid false temperature
readings and therefore affect system operation. If this
is not possible, shield the control system by placing a
sheet of insulating material (cork, polystyrene or other
similar) between the control system and the wall.
By following the above guidelines, unwanted
starting and stopping of the system can be avoided
and optimal comfort in the heated space can be
guaranteed.
4.4.2
Chronothermostat
How to install the chronothermostat
The chronothermostat must be installed on the
wall in a suitable position, using expansion screws.
The chronothermostat is supplied already connect-
ed to the electronic board of the gas unit heater by
means of a 5-metre long cable (Figure 4.2
p. 24).
For lengths longer than 5 meters use an unshielded
2x0,75 mm
2
cable with 5 Ω maximum resistance for
each conductor (use a shielded cable if the installa-
tion has strong electromagnetic interference).
The cable may not be longer than 30 metres.
Figure 4.2
Connection of chronothermostat and dialogue board if the supplied cable is not used
A Dialogue board located on the control board at position X13
B
Cable 2x0,75 mm
2
, maximum resistance for conductor 5 Ω,
maximum length 30 meters
C
Chronothermostat
B
C
A
J1
J2
4.4.3
Control of multiple gas unit heaters with a
single external request
In winter it is possible to control several gas unit heaters
with a single external request (e.g. programmable timer)
by removing the electrical bridge on the terminals X10
(Paragraph 1.3
p. 11) marked with the radiator symbol
and connecting the external request to the same ter-
minals (Figure 4.3
In summer it is possible to control several gas unit heaters
with a single external request (e.g. programmable timer)
by removing the electrical bridge on the terminals X7
(Paragraph 1.3
p. 11) marked with the fan symbol
and connecting the external request to the same termi-
nals (Figure 4.3
In any case, each gas unit heater must be connected to the
respective chronothermostat and the operation enable
