Differential Air Pressure Switch; Installing A Room Thermostat - Ferroli F30 Installation, Servicing And User Instructions Manual

When the boiler is connected to an electricity main, it is essential TO OBSERVE CORRECT POLARITIES (LIVE:
brown cable, NEUTRAL: blue cable, EARTH: yellow-green cable)
All wiring must con orm to current I E E regulations
: I 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 o 8 mm
When connecting a room thermostat or external timer, do not lin the power supply o these de ices
to the switching contacts The switch contacts must be oltage ree Any mains powered de ices must utilise
mains power solely to dri e the timer motor
Applying mains v l ag
Although this boiler can also be used without a room thermostat, you are recommended to install one
or the ollowing reasons:
reater com ort conditions due to more accurate control o room temperature
reater energy sa ings
3 10 Diff r n ial air pr ssur swi ch ( g 2 - part 4 )
The di erential air pressure switch is a sa ety de ice which allows the main burner to ignite only a ter ha ing
eri ed that the an is wor ing correctly I the di erence in pressure between the ue gas discharge pipe and the
air inta e pipe is not at least e ual to the minimum pressure switch calibration alue, the pressure switch contacts
do not close and the gas al e is thus pre ented rom opening
In addition, the electrical circuit o the boiler is designed so that i or any reason the air pressure switch contacts
remain closed when the an stops, the burner will not start up again
3 11 h c s
ill the central heating system as described pre iously ( 07) and chec there are no lea s in the domestic hot
water and boiler water circuits Chec that there are no gas lea s on the boiler or the supply to the boiler Also
chec that the electrical connections are correct
3 1 ns alling a r m h rm s a
To connect the thermostat:
Open the electrical box on the base o the appliance and remo e the " umper cable between terminals
and 4
Connect the room thermostat (72) as shown in gure 22b
h swi ch c n ac s will irr parably damag
( g 22b)
h circui b ard
23