Combustion Adjustment; Recommended Nozzles - Riello GRG4S Manuel D'entretien

4. WORKING
4.1

COMBUSTION ADJUSTMENT

In conformity with Efficiency Directive 92/42/EEC the application of the burner on the boiler, adjustment and testing
must be carried out observing the instruction manual of the boiler, including verification of the CO and CO
concentration in the flue gases, their temperatures and the average temperature of the water in the boiler. 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 shown
in the table are measured on a CEN boiler (as per EN 267). They refer to 12.5% CO
oil and room temperature of 20 °C.
Nozzle
pressure
GPH Angle
2.50 60°
3.00 60°
3.50 60°
4.00 60°
4.50 60°
4.50 60°
4.2

RECOMMENDED NOZZLES:

Monarch type R
Delavan type W
(up to 3,00 GPH)
Delavan type B (over 3,00 GPH)
Steinen type SS - S; Danfoss type B - S.
NOTE: To achieve CLASS 2 (EN267:1999)
emissions, the following nozzles
have been used:
- hollow-cone model.
TO FIT NOZZLE CARRY OUT THE FOLLOWING
ACTIONS, (see fig. 12)
Remove nozzle-holder assembly (1) after loosing
screws (2) and nut (3), remove the small cables (4)
from the control box and the photoresistance (5).
Withdraw the small cables (4) from the elec-
trodes, remove the diffuser disc-holder assembly
(8) from the nozzle-holder assembly (1) after loos-
ing screw (3, fig. 13, page 7).
Screw the nozzle (9) correctly and tighten it as
shown in fig. 12.
In the long head version the socket wrench (10)
should lock the extension part that carries the
nozzle.
Attention
During the reassembly of the nozzle-holder assem-
bly screw the nut (3) as shown in the figure below.
TIGHTEN WITHOUT MOVING
BACKWARDS TO THE END
1916
Pump Burner
output
bar kg/h ± 4%
12 10.0
12 12.0
12 14.0
12 16.1
12 18.1
14 19.5
D5684
3
Combustion
head adjustment
Set-point
0
1
2.5
4
6
6
Fig. 12
10
6
GB
at sea level and with light
2
Air damper adjustment
Low-flame High-flame
Set-point Set-point
0.2 1.4
0.4 2.1
0.7 3.0
0.9 3.5
1.4 4.5
1.4 6.0
S7219
2