Settings - Beretta Novella MAXIMA 129 N RAI Installation Manual

4.4

Settings

Novella MAXIMA boilers come pre-config-
ured for use with methane gas (G20), as
shown by the gas plate, and have been cali-
brated in the factory using the values listed in
the table below (tolerance ±5 %).
Adjustments are therefore only required after
repairs or after the replacement of the gas
valve.
Description
Lower Wobbe index
(at 15°C - 1013 mbar)
Mains gas pressure
(supply) (**)
Number of nozzles in main burner
Flow rate (*)
Nozzle pressure
Description
Lower Wobbe index
(at 15°C - 1013 mbar)
Mains gas pressure
(supply) (**)
Number of nozzles in main burner
Flow rate (*)
30
Nozzle pressure
Description
Lower Wobbe index
(at 15°C - 1013 mbar)
Mains gas pressure
(supply) (**)
Number of nozzles in main burner
Flow rate (*)
Nozzle pressure
(*) Temperature 15°C; Pressure 1013 mbar
(**) Functioning is guaranteed at pressures down to a minimum of 13.5 mbar.
NOZZLE PRESSURE
- Unscrew the pressure measurement point
screws (10) by about three turns and con-
nect up the pressure gauge.
- Start up the boiler as instructed on page
27
- Check that gas pressure at the nozzles cor-
responds to the values given in the tables
above. If necessary, adjust the pressure as
instructed in the "Adjusting gas pressure"
section on page 32.
- Disconnect the pressure gauge and tighten
the pressure measurement point screws
(10).
b
129
MJ/m 3
rated mbar
minimum mbar
n° 6
Ø mm
kg/h 15,44
rated mbar
minimum mbar
129
MJ/m 3
rated mbar
minimum mbar
n° 6
Ø mm
kg/h 11,50
mbar
129
MJ/m 3
rated mbar
minimum mbar
n° 6
Ø mm
kg/h 11,32
mbar
Adjustments must only be performed by a
Technical Assistance Centre.
G20
151 172 194
45,67
20
17
7 8 9
4,30
17,99 20,55 23,10
9,7
6
G30
151 172 194
80,58
30
25
7 8 9
2,50
13,41 15,32 17,21
28
G31
151 172 194
70,69
37
25
7 8 9
2,50
13,19 15,07 16,93
35
10
215 237 258
10 11 12
25,63 28,16 30,70
215 237 258
10 11 12
19,10 20,98 22,88
215 237 258
10 11 12
18,79 20,64 22,50
Fig. 4.14
279
13
33,20
279
13
24,74
279
13
24,34