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Table of burner pressures - heat output
2.24 FF
mbar
mbar
mbar
G20
G30
G31
2,0
5,1
6,0
2,3
5,7
6,9
2,7
6,6
8,5
3,2
8,0
10,3
3,8
9,6
12,2
4,5
11,2
14,4
5,2
13,0
16,7
5,9
15,0
19,1
6,8
17,0
21,8
7,6
19,2
24,6
8,6
21,5
27,6
9,5
24,0
30,7
10,6
26,6
34,0
11,2
28,2
36,1
1 mbar = 10,197 mmH
0
2
Table 1
Consumption table - burner injectors
Gas used
main injector diameter (mm)
no. of injectors
Table 2
Consumption 15 °C - 1013 mbar
Rated heat output
Reduced heat output
p.c.i.
Table 3
Control and operation devices
The boiler has been designed in full compliance with European reference standards and
in particular is equipped with the following:
•
Central heating temperature adjustment potentiometer
This potentiometer sets the central heating flow max. temperature. Its temperature
range goes from 30 °C min. to 80 °C max.
To increase the temperature turn knob (12) clockwise and anticlockwise to decrease
it.
•
Domestic hot water temperature adjusting potentiometer
This potentiometer sets the domestic hot water max. temperature. Its temperature
range goes from 35 °C min. to 55 °C max according to the water inlet flow rate.
To increase the temperature turn knob (13) clockwise and anticlockwise to decrease
it.
•
Air pressure switch for forced draft models (2.24 FF)
This switch allows the main burner to switch on provided the exhaust flue duct
efficiency is perfect.
In the event of one of the following faults:
•
the flue terminal is obstructed
•
the venturi is obstructed
•
the fan is blocked
•
the connection between the venturi and the air pressure switch is not active
the boiler will stay on stand-by and the light (4) will flash.
•
Overheat thermostat (2.24 CF)
Thanks to a sensor placed on the heating flow, this thermostat interrupts the gas flow
to the main burner in case the water contained in the primary system has overheated.
Under such conditions the boiler is blocked and relighting (briefly rotating selector
(1) to position (
) will only be possible after the cause of the anomaly has been
removed.
It is forbidden to disenable this safety device
•
Flame ionization detector
The flame sensing electrode, placed on the right of the burner, guarantees safety of
operation in case of gas failure or incomplete interlighting of the main burner. Under
such conditions the boiler is blocked. Rotate selector (1) briefly to position (
restore normal operating conditions.
•
Hydraulic pressure sensor
kW
kcal/h
9,3
8.000
Reduced heat output
10,5
9.000
11,6
10.000
12,8
11.000
14,0
12.000
15,1
13.000
16,3
14.000
17,4
15.000
18,6
16.000
19,8
17.000
20,9
18.000
22,1
19.000
23,3
20.000
24,0
20.600
Rated heat output
G20
1,28
13
2.24 FF - 2.24 CF
G20
G30
2,78 m
/h
2,07 kg/h
3
1,12 m
/h
0,84 kg/h
3
34,02 MJ/m
45,6 MJ/kg
3
mbar
G20
2,3
2,6
3,1
3,7
4,4
5,2
6,1
6,9
7,9
8,9
10,0
11,1
12,3
13,1
1 mbar = 10,197 mmH
Table 1
2.24 FF
G30
G31
0,74
0,74
13
13
G31
2,04 kg/h
0,82 kg/h
46,3 MJ/kg
This device enables the main burner only to be switched on if the system pressure
is over 0.5 bars.
•
Supplementary running of the pump
The electronically-controlled supplementary running of the pump lasts 3 minutes,
when the boiler is in the central heating mode, after the burner has switched off due
to a room thermostat or intervention.
•
Frost protection device (central heating system)
Boilers electronic management includes a "frost protection" function in the central
heating system which operates the burner to reach a heating flow temperature of
30°C when the system heating flow temperature drops below 5 °C.
This function is enabled when the electrical supply to the boiler is on, the gas supply
is on and the system pressure is as required.
•
Pump-blocking prevention
In case there is no call for heat either from the central heating system for 24 hours
on end the pump will automatically switch on for 10 seconds.
This function is enabled if the electrical supply to the boiler is on.
•
Hydraulic safety valve (heating circuit)
This device is set to 3 bar and is used for the heating circuit.
The safety valve should be connected to a siphoned drain. Use as a means of draining
the heating circuit is strictly prohibited.
) to
51
2.24 CF
mbar
mbar
kW
G30
G31
4,8
6,3
9,3
5,4
6,7
10,5
6,5
8,3
11,6
7,8
10,1
12,8
9,3
12,0
14,0
11,0
14,1
15,1
12,7
16,3
16,3
14,6
18,7
17,4
16,6
21,3
18,6
18,7
24,0
19,8
21,0
27,0
20,9
23,4
30,0
22,1
25,9
33,3
23,3
27,5
35,3
24,0
0
2
2.24 CF
G20
G30
1,18
0,74
13
13
Fr
kcal/h
CN
8.000
9.000
10.000
11.000
GB
12.000
13.000
14.000
15.000
16.000
Gr
17.000
18.000
19.000
20.000
SP
20.600
PT
G31
0,74
13
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