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Type C83
Type C device, equipped with fan after the combustion chamber,
and designed for connection, via its own duct, to single chimney
or chimney system serving more than one appliance (collective sy-
stem).
The single or collective chimney system is designed to operate via
natural draught.
The device is connected, via an additional duct, to an air intake
terminal retrieving air from outside the boiler room.
For suitable pipe lengths refer to type C53 charts.
3.2.7. Measuring combustion efficiency
Perform the following measurements in order to determine combu-
stion efficiency:
- combustion air temperature;
- temperature of flue gas and the CO
2
concentration from provided
opening on the flue gas duct.
Perform the measurements after the boiler has reached
working temperature, and after verifying the Bacharach index
to be less than 1.
3.2.8. Connecting to the power mains
The heating unit must be connected to a 230V – 50 Hz power
supply.
The power cable must be made of rubber.
Do not use PVC cables, which have low temperature resistan-
ce and tend to deteriorate over time.
Make sure polarity instructions are followed and phase and
neutral are correctly wired.
Installation procedure is to comply with applicable standards
and laws, which are to be considered as fully incorporated to this
manual.
A two-pole switch must be fitted before the heating unit to ensure
safe maintenance procedures.
The power cabling must be protected by a differential magneto-
thermal switch with a suitable breaking capacity.
The mains supply must be properly earthed.
Carefully verify the above safety precaution. When in doubt, have
the electric system carefully checked by a qualified technician.
The manufacturer shall not be held liable for damage or injury
caused by failure to properly earth the system. The DHW, CH
and fuel pipes are not suitable for grounding purposes.
3.2.9. Hydraulic connections
CENTRAL HEATING
Before installing the heating unit we recommend you clean the sy-
stem to remove any impurities from the various components which
might damage the circulating pumps or the heat exchanger.
Central heating flow and return pipes must be connected to their
relevant G 1 fittings.
When determining the size of central heating circuit pipes, it is
necessary to take into account the load losses induced by the
radiators, thermostatic valves, radiator cut-off valves and configu-
ration of the system.
DOMESTIC HOT WATER (B and BV models)
Flow and return pipes must be connected to the relevant G ¾”
fittings on the heating unit.
Water mains pressure must not exceed 7 bar ( in presence of
higher pressures a reducer is to be installed).
The pressure in the DHW circuit is to limited to 3 - 4 bars.
The hardness of water from mains determines how often the coil
heat exchanger needs to be cleaned.
WARNING
- Should water be particularly hard it may be necessary to
install a domestic water softener, administering a specific pro-
duct for treating drinking water in compliance with applicable
laws.
It is always advisable to treat water harder than 20°F.
- Due to its pH value, water supplied from normal water sof-
teners may not be compatible with some components of the
heating system.
- The safety valve should be connected to the sewer, othe-
rwise the boiler room may get flooded.
The manufacturer shall not be held liable for damages caused
by failure to follow the above safety precautions.
3.2.10. Room thermostat connection
The heating unit can be connected to a room thermostat (option).
The wires of the room thermostat
are to be fixed to the relevant connection on the heating unit
electronic board (see electric layout charts).
The room thermostat contact is to be potential free.
The room thermostat wires are not to be routed together with the
power main cables.
