24
3.6 BOILER SAFETY SYSTEMS
In the boiler, it is possible to monitor the correct operation
of the flue exhaust/air intake, checking for a loss of
general pressure in the system. Through the use of a
differential manometer connected to the test points of the
combustion chamber, it is possible to detect the ∆P of
operation of the air pressure switch.
The value detected should not be less than 0.90 mbar (31
kW) under conditions of maximum thermal power in order
for the boiler to function properly and without interruption.
The flue connector has two apertures, readings can be
tak
en for the temperature of the combustion by-products
and of the combustion air, as well as of the
concentrations of O2 and CO2, etc.
To access these intakes it is necessary to unscrew the
front screw and remove the metal plate with sealing
gask
et.
It is possible to activate the flue test mode (maximum
output) by pressing and holding the RESET button “D” for
10 seconds,
“
s
s
c
c
” will be shown on the display. The boiler
will retur
n to normal operation after 5 minutes. The boiler
can be returned to normal operation sooner by switching
the boiler off and on again.
3.4 COMBUSTION ANALYSIS
3.5 PR
ODUCT OF
COMB
USTION
DISCHARGE MONITORING
FU008A
FU009A
The boiler is protected from malfunctioning by means of
internal checks by the P.C.B., which brings the boiler to a
stop if necessary.
There are two types of shut-off:
•
SHUTDOWN (A)
• SAFETY SHUTDOWN (E)
SHUTDO
WN
“
A
A
”
This type of appliance shutdown is called “volatile”, and is
indicated on the display by a number preceded by the letter
(A), and by the symbol GFIG. 2.22 Page 18), as
illustrated in the table below:
DISPLAY CAUSE
A
A
0
0
1
1
No flame after saf
ety time (7 seconds)
A
A
0
0
3
3
The heating flow temperature exceeds
103
o
C during operation
A
A
9
9
7
7
Prob
lem with the electronic monitor
ing
A
A
9
9
8
8
Prob
lem with the electronic monitor
ing
A
A
9
9
9
9
Problem with the electronic monitoring
WARNING!
The boiler is still powered.
Important
If this shutdown occurs frequently, contact an
authorised Service Centre for assistance. For safety
reasons, the boiler will allow a
maximum of 5 reset
operations to take place in 15 minutes (pressing the
RESET button).
If the shutdown is occasional or an isolated ev
ent, this is
not necessarily a problem.
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