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 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).
18
400
5. Adjust the soft-light feature;
6. Adjust the delayed lighting feature for the heating system (can be set from 0 to 2
mins.).
CATEGORY II2H3+
Methane Gas
Liquid Butane Gas
Liquid Propane Gas
G20
G30
G31
Recommended Soft-light Pressure
(mbar)
5-5.4 13.4
13.4
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
GENUS 27 BFFI PLUS
Main Burner: n. 15 jets (ø)
mm
1.25
0.72
0.72
Consumption (15°C; 1013mbar)
m
3
/h
3.16
----
----
Consumption (15°C; 1013mbar)
Kg/h
----
2.35
2.32
Gas Cock Outlet Pressure
max - min
mbar
11.0- 2.0
(*) - 5.0
(*) - 7.0
4.
GAS ADJUSTMENTS
(1mbar = 10,197column of water)
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.
CATEGORY II2H3+
Methane Gas
G20
Liquid Butane Gas
G30
Liquid Propane Gas
G31
4.1
Changing the Type
of Gas
The boiler can be converted to use either methane (natural) gas (G20) or LPG
(G30 - G31) by an Authorised Service Centre.
The operations that must be performed are the following:
1. Replace the jets on the main burner (see table in section 4);
2. Adjust the maximum and minimum thermal capacity values for the boiler (see
table in section 4);
3. Replace the gas rating plate;
4. Adjust the maximum thermal power setting;
