Technical information

31
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 maxim
um ther
mal po
w
er 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 CO2, 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
s
c
c
”
will be shown on the display. The boiler will retur
n to nor
mal
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 PRODUCT OF COMBUSTION
DISCHARGE MONITORING
FU008A
FU009A
To access the areas in which adjustments are made, it is necessary
to open the control panel, as indicated in SE
CTION
2.12, then remove
the rear inspection cover by unscrewing the two screws “A”.
A
ccess 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
factory 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.
NOTE:SEE PAGE 22 FOR DIP SWITCH LOCATION.
3.3 OPERATIONAL
ADJUSTMENTS
A
A
The boiler allows the convenience level to be increased in the
output of domestic hot w
ater b
y means of the
“COMFOR
T” function.
This function keeps the secondary exchanger warm during the
per
iods in which the boiler is inactiv
e
, thereb
y allo
wing 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 COMFORT MODE