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caldaie
1.5 IDENTIFICATION OF MAIN
COMPONENTS
(APPENDIX - A page 77)
INDEX
• Burner page 3
• Combustion chamber page 3
• Circulator page 3
• Igniter/control electrode page 4
• Flowmeter page 4
• Flow limiter page 4
• Water pressure switch page 4
• Safety pressure switch (C.S.I. only) page 4
• Filling tap page 5
• Bithermal exchanger page 5
• Air box (C.S.I. only) page 5
• Electronic control panel page 5
• NTC temperature control probes page 6
• Fumes thermostat (C.A.I. only) page 6
• Limit thermostat page 6
• By-pass valve page 6
• Gas valve page 6
• Safety valve page 7
• Expansion tank page 7
• Fan (C.S.I. only) page 7
• Venturi and Pitot tube page 7
1.5.1 Burner
(POS. 1 APPENDIX - A page 77)
The burner is installed underneath the combustion chamber
(Sect. 1.5.2 page 3) and serves to create the correct mixture of
air and gas for the combustion process.
It consists of a series of perforated ramps in stainless steel, linked
together and adequately spaced one from the other.
The gas flowing from the valve (Sect. 1.5.17 page 6) enters the
burner Venturi and mixes with primary air; the mixture then
comes out of the numerous openings made on the upper parts
of the ramps and ignites, thanks to the secondary air sucked
into the combustion chamber.
1.5.2 Combustion chamber
(POS. 2 APPENDIX - A page 77)
The combustion chamber is located at the centre of the boiler
and combustion occurs inside it.
It consists of a steel plate structure adequately folded to be
able to insert slabs of insulating material made of ceramic
fibre with normal working temperature of about 1200°C
and a melting point of about 1700°C.
1.5.3 Circulator
(POS. 3 APPENDIX - A page 77)
The circulator is installed on the return side of the boiler
water circuit and it facilitates the water circulation while
heating is on when the room thermostat signals a drop in heat.
The circulator is made of composite material with incorporated
degasser.
The current must be higher than that of the main power supply
at ignition to push the water into the central heating system;
this is why it is necessary for the condenser discharge to be
housed inside the connector box.
Water in the pump is circulated and pushed towards the
bi-thermal exchanger (Sect. 1.5.10 page 5) by the blades.
At the same time a vacuum is created inside the pump,
sucking other water from the system and triggering off the
circulation of primary fluid.
Fig. 1.2
Fig. 1.3
Fig. 1.4
Automatic air
vent bottle
Connection cover
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