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B023
off status. After the system has been allowed to cool, the system can be reset
by pressing the button “A”.
4 - Limescale Build-up
This is an indirect control (actuated through the regulation of the temperature in
the primary heat exchanger) on the formation of limescale in the secondary
heat exchanger. Regardless of the flow rate and the temperature in the circuit
for the domestic hot water, the temperature is limited to 62°C.
5 - Safety Shut-off
At the start of every lighting phase, the P.C.B. performs a series of internal
controls. If a malfunction occurs, the boiler will shutdown until the problem has
been resolved.
3.9 Draining the System
Draining the heating system.
The heating system must be emptied as follows:
- Turn off the boiler;
- Open the drain valve for the system and place a container below to catch the
water that comes out;
- Empty the system at the lowest points (where present). If you plan on not
using the heating system for an extended period of time, it is recommended
that you add antifreeze with an ethylene glycol base to the water in the
heating lines and radiators if the ambient temperature drops below 0°C during
the winter.
This makes repeated draining of the entire system unnecessary.
Draining the domestic hot water system.
Whenever there is the danger of the temperature dropping below the freezing
point, the domestic hot water system must be drained as follows:
- Turn off the general water valve for the household plumbing system;
- Turn on all the hot and cold water taps;
- Empty the remaining water from the lowest points in the system (where
present).
The outlet pressure of the gas cock is obtained by completely loosening the
screw on the solenoid. The maximum pressure of the gas to the burner will be
equal to the nominal delivery pressure minus the head loss within the gas
valve.
4. GAS ADJUSTMENTS
(1mbar = 10,197 column of water)
CATEGORY II2H3+ Methane Gas
G20
Liquid Butane Gas
G30
Liquid Propane Gas
G31
Lower Wobbe Index (15°C;1013mbar) MJ/m
3
h 45.67 80.58 70.69
Nominal Delivery Pressure mbar 20 30 37
Minimum Delivery Pressure mbar 17 20 25
A/23 MFFI
Main Burner: n. 13 jets (ø) mm 1.,25 0.72 0.72
Consumption (15°C; 1013mbar) mc/h 2.72 ---- ----
Consumption (15°C; 1013mbar) Kg/h ---- 2.02 2.02
Gas Cock Outlet Pressure
min - max mbar 11.4- 2.0 27.5 (*) - 5.2 35.0 (*) - 7.0
A/27 MFFI
Main Burner: n. 15 jets (ø) 1.25 0.72 0.72
Consumption (15°C; 1013mbar) mc/h 3.16 ---- ----
Consumption (15°C; 1013mbar) Kg/h ---- 2.35 2.32
Gas Cock Outlet Pressure:
max - min mbar 11.6-2.2 (*) - 4.8 (*) - 6.0