Riello RG4F Installation, Use And Maintenance Instructions page 46

4. OPERATION
4.1 COMBUSTION ADJUSTMENT
In conformity with EN267, the installation of the burner to the heat generator, setting and testing must all be
performed in respect of the instruction manual for the heater, including the controls on the concentration of
CO and CO2 in the flue gases, the flue gas temperature and the average water and air temperatures in the
generator.
To suit the required appliance output, choose the proper nozzle and adjust the pump pressure, the setting of
the combustion head, and the air damper opening in accordance with the following schedule.
The values given in the table refer to a CEN boiler (in accordance with EN 267). They refer to 12.5% of CO2,
at sea level, room temperature and light oil temperature at 20°C, 50 Hz power frequency and combustion
chamber counterpressure at 0.
Nozzle
GPH Angle
2.50 60°
3.00 60°
3.50 60°
4.00 60°
4.50 60°
4.50 60°
ATTENTION
The values given in the table are just an indica-
tion; to get the best performance from the burner,
the regulations should be made on the basis of
the effective requirements of the generator.
With 60Hz power frequency, the burner must be
re-set, closing the air damper, so that the amount
of intake air is reduced.
4.2 RECOMMENDED NOZZLE
Monarch type R
Delavan type W
Delavan type B
Steinen type SS - S
Danfoss type B - S
REPLACING NOZZLE:
To replace nozzle, proceed as follows:
Disconnect cables (4) from flame control and pull

out the flame sensor (6).
Unscrew nut (3), loosen screws (2) and remove

nozzle-holder assembly (1) by rotating slightly to
the right.
Disconnect cables (4) from electrodes, unscrew

screws (3, Fig. 15, on page 9) and remove the diffu-
ser disc support assembly (10) from nozzle-holder
assembly (1).
Replace nozzle (11) and screw new one on prop-

erly, holding it as illustrated in Fig. 13.
2903004
Pump Burner
pressure output
bar kg/h ± 4%
12 10.0
12 12.0
12 14.0
12 16.1
12 18.1
14 19.5
up to 3.00 GPH
over 3.00 GPH
Combustion head
adjustment
Set-point
0
1
2.5
4
6
6
8 GB
Air damper
adjustment
Set-point
1.4
2.1
3.0
3.5
4.5
6.0
Tab. D
S7180
Fig. 13