5
caldaie
Compensating
outlet
Analysis
of outlets
Primary
water
flowing
Secondary
water
flowing
Turbo propeller
1.5.9 Filling tap
(POS. 8 APPENDIX - A page 77)
The filling tap is located at the sanitary inlet in the boiler and
has the job of connecting up the sanitary system with the heating
system for filling or topping up (Sect. 7.4 page 72) .
1.5.10 Bi-thermal exchanger
(POS. 9 APPENDIX - A page 77)
The bi-thermal exchanger is located on the upper part of the
combustion chamber (Sect. 1.5.2 page 3) and is the part used
by the primary water (heating) and secondary (sanitary) water
for heating up by effect of heat generated in combustion.
It consists of a coil with two oval shaped tubes, one inside
the other, all fitted inside a commutator core which is
designed to increase the area of heat exchange. The entire
exchanger is coated with aluminium alloy to protect it from
corrosion.
The outside part of the coil is reserved for the flow of primary
fluid, flowing against the current of the secondary fluid.
The inside part is reserved for the flow of secondary water;
the coil has septum inside - turbo propeller - to increase
performance and to avoid temperature stratification.
1.5.11 Air box ( C.S.I. only)
(POS. 10 APPENDIX - A page 77)
The air box is at the centre of the boiler and serves to isolate all
components involved in the combustion process (burner,
combustion chamber, electrode, safety pressure switch,
exchanger and fan) from the domestic environment.
It is made up of four units in aluminised metal sheets with
neoprene sealing.
There is a compensation outlet connected to the gas valve
pressure regulator, at the bottom of the box. The outlet stabilizes
the membrane inside the regulator through a small tube.
The air box is designed to be able to analyse combustion
parameters without having to remove the case.
Measurements are taken through two pockets located on
the upper part, which are used to house probes for measuring
air temperature andpolluting fumes are inserted, after
removing the screw caps.
1.5.12 Electronic control panel
(POS. 11 APPENDIX - A page 77)
The electronic control panel is housed inside the control panel
and is designed to control the entire appliance.
It contains terminals for connecting up the boiler electrically
and for connecting a eventualy room thermostat (Sect. 7.3
page 71).
Fig. 1.10
Fig. 1.11
Fig. 1.13
Fig. 1.12
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