32
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 DP of
operation of the air pressure switch.
The value detected should not be less than 0.55 mbar
under conditions of maximum thermal power (see Section
3.4), in order for the boiler to function properly and
without interruption.
The flue connector has two apertures, readings can be
taken for the temperature of the combustion products and
of the combustion air, as well as of the concentrations of
O2 and CO
2
, etc.
To access these intakes it is necessary to unscrew the
front screw and remove the metal plate with sealing
gasket.
It is possible to activate the flue test mode (maximum
output) by pressing and holding the RESET button “D” for
10 seconds,
“
s
sc
c
” will be shown on the display. The boiler
will return 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
C
OMBUSTION
A
NALYSIS
3.5
P
RODUCT OF
C
OMBUSTION
D
ISCHARGE
M
ONITORING
FU008A
FU009A
To access the areas in which adjustments are made, it is
necessary to open the control panel, as indicated in
S
ECTION
2.12, then remove the rear inspection cover by
unscrewing the two screws “A”. Access is thereby
provided to the P.C.B. and to the following components:
1. The power supply cable connector;
2. The fuses;
3. The soft-light potentiometer must be set to ensure
correct ignition;
4. The maximum thermal heating power potentiometer
adjustable by the minimum to maximum power
(already calibrated in the factor y to 70% of the
maximum thermal power in Central Heating mode);
5. The dip switch for adjusting the ignition delay (anti-
cycling) feature, which can be set from off to 2
minutes (set in the factory to off);
6. Fan/Pump Over-run (Electrical Diagram). When the
jumper is set to position A the Fan and Pump over-run is
activated. (The jumper is factory set in position B)
7. The time clock connector.
N
OTE
:
S
EE PAGE
27
FOR DIP SWITCH LOCATION
.
3.3
O
PERATIONAL
A
DJUSTMENTS
A
A
The boiler allows the convenience level to be increased in
the output of domestic hot water by means of the
“COMFORT” function. This function keeps the secondary
exchanger warm during the periods in which the boiler is
inactive, thereby allowing the initial water drawn to be at a
higher temperature.
The function may be activated by pressing turning the
COMFORT switch ‘E’ on the control panel from E to C
(see section 2.10).
3.6
C
OMFORT
M
ODE
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