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Note: If the power supply cable has to be replaced, use "0.75mm (24/0.20) heat resisting cable only to
BS6500 with a maximum external diameter of 8 mm.
Note - When connecting a room thermostat or external timer, do not link the power supply of these devices to the
switching contacts. The switch contacts must be voltage free. Any mains powered devices must utilise mains power
solely to drive the timer motor.
Applying mains voltage to the switch contacts will irreparably damage the circuit board.
Although this boiler can also be used without a room thermostat, you are recommended to install one for the
following reasons:
Greater comfort conditions due to more accurate control of room temperature.
Greater energy savings.
3.10 Differential air pressure switch (fig. 2 - part 43)
The differential air pressure switch is a safety device which allows the main burner to ignite only after having verified
that the fan is working correctly. If the difference in pressure between the flue gas discharge pipe and the air intake
pipe is not at least equal to the minimum pressure switch calibration value, the pressure switch contacts do not close
and the gas valve is thus prevented from opening. In addition, the electrical circuit of the boiler is designed so that
if for any reason the air pressure switch contacts remain closed when the fan stops, the burner will not start up again.
3.11 Checks
Fill the central heating system as described previously (3.07) and check there are no leaks in the domestic hot water
and boiler water circuits. Check that there are no gas leaks on the boiler or the supply to the boiler. Also check that
the electrical connections are correct.
3.12 Installing a room thermostat (72) (fig. 21b)
To connect the thermostat:
Open the electrical box on the base of the appliance and remove the "jumper cable" between terminals 3 and 4.
Connect the room thermostat (72) as shown in figure 21b.
3.13 Ferroli Domina boiler programmer fixing (optional)
- Remove outer case by removing two securing screws from the rear bottom corners and lift off.
- Remove screw securing facia panel and swing facia panel down.
- Remove rear cover from facia.
- Remove clock blanking plate
from the boiler facia panel.
- Mount clock into facia panel
using two screws and spacers
provided.
- Take
the
black
containing the blue and brown
wires and connect the loose
spades to clock terminals 1 &
2.
- Connect the plug end of the
cable to terminal X2 of main
circuit board.
- Remove the connector link
from the 2 wires located
behind the clock position.
- Connect these to terminal 3
and 5 of the clock.
- Replace everything in reverse
order.
- Please refer to page 48 of User
manual for use of time clock
20
DOMINA 102 DGT
N
2
1
3
X1
X2
cable
1
2
3
4
5
6
7
8
9
10
11
12
X4
Existing wiring
L
1
15
14
13
12
11
10
8
7
6
5
4
X5
DMF03
X6
10
11
12
13
14
15
Fig. 21a
2
1
1
2
3
4
5
6
7
8
72
X7
1
2
3
4
5
6
7
8
9
10
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