19
Should gas be already in the pipes, leak testing by a
naked flame is forbidden. Use specific products availa-
ble on the market.
WARNING
IT IS MANDATORY when connecting the boiler to the
gas supply network, to employ an appropriately sized
and made gasket (pic. 14). The boiler gas inlet thread
configuration IS NOT appropriate for hemp, plastic tape
or similarly made gaskets.
3.2.14. Power mains connection
The boiler is supplied with a three-poled power cable, alrea-
dy connected to the electronic board; it is provided with an
anti-rupture firming clamp. The boiler must be connected
to a 230V-50Hz power mains supply.
When connecting the boiler to the power mains, res-
pect phase / neutral sequence.
Installation must be carried out in compliance with appli-
cable standards which are considered as integral part of
this manual.
An easy accessible two-poled switch must be installed
outside the boiler. The switch minimum distance between
contacts is 3 mm. The switch must allow power supply in-
terruption in order to safely perform maintenance and ser-
vice.
Power supply to the boiler must be fitted with a differential
magnetic-thermal automatic switch of appropriate shut-
down capacity.
Electrical power supply must be appropriately earthed.
The above mentioned safety measure must be verified. If
in doubt, ask a qualified technician to thoroughly check the
power network. The Manufacturer shall not be held respon-
sible for any damage due to failure in grounding the sy-
stem. Gas, hydraulic, or CH system pipes are not suitable
for grounding a power network.
3.2.15. Room thermostat connection (optional)
The boiler may be connected to a room thermostat:
room
thermostat contacts must be properly sized in relation
to a 5 mA, 24 Vdc load.
The room thermostat wiring must be connected to M9 po-
sition on the terminal board shown in pic. 16, after remo-
ving the jumper supplied as standard with the boiler.
The room thermostat wiring must NOT be grouped together
with the power mains supply cables.
3.2.16. Hydraulic connections
Prior to installing the boiler, the hydraulic system has to
be cleaned in order to remove impurities which could be
present in system components and damage the pump and
the heat exchanger.
CENTRAL HEATING SYSTEM
CH flow and return pipes must be connected to the rele-
vant 3/4” M and R couplings on the boiler (pic. 5).
When calculating CH system pipe size, bear in mind load
losses caused by radiators, thermostatic valves, radiator
gate valves, and the configuration of the system itself.
It is advisable to convey the flow from the boiler safety val-
ve to the sewer system. Should the above precaution not
be implemented and the safety valve be activated, boiler
room flooding may occur.
The manufacturer shall not be held responsible for any da-
mage resulting from failure in observing the above mentio-
ned technical precaution.
DOMESTIC HOT WATER
DHW flow and water mains inlet pipes must be connected
to the relevant 1/2” C and F couplings on the boiler (pic.
5).
Hardness level of water supplied to the boiler may increase
heat exchanger cleaning / replacement frequency.
WARNING
Depending on hardness level of the water supplied, it
might be necessary installing a suitable water treat-
ment device for domestic use and in compliance with
applicable laws and standards.
Water treatment is always advisable when hardness le-
vel of water supplied to the boiler is more than 20°F.
WARNING
Water treated by commonly marketed softeners, due
to pH level induced, may not be compatible with some
components in the system.
3.2.17. Remote control board installation (optio-
nal equipment)
A remote control board (optional equipment) can be
connected to the boiler in order to achieve increased
functional management such as operation tempera-
tures, CH scheduling and malfunction detection.
The remote control board is to be positioned on an
inside wall, far from heat sources or draughts.
Detach by means of a screwdriver the rear part of
the casing (grey) from the front one (white) and fix
the rear part of the casing to the wall through holes
A (pic. AA).
WARNING
Remote control board is to be connected to 230V
power mains. Remote control board wirings are
not to be grouped together with the power mains
wires.
535
349
gasket
pic. 14
