Riello G3BF 490T53 Installation, Use & Maintenance Manual page 9

THE BURNERS LEAVE THE FACTORY SET AT THESE VALUES
TYPE
490 T53
Danfoss 0.60 GPH - 80° H
492 T57
Danfoss 0.75 GPH - 80° H
489 T53
Danfoss 1.00 GPH - 80° H
3
COMBUSTION HEAD SETTING
This is done when fitting the nozzle, with the blast tube removed.
It depends on the output of the burner and is carried out by rotating the regulating rod, till the terminal
plane of the blast tube is level with the set-point, as indicated in the schedule.
In the sketch below, the combustion head is set for an output of 1.25 GPH at 8 bar .
The shutter is level with set-point 3, as required by the schedule at page 6.
Terminal plane of the blast tube
Blast tube
D5232
Combustion head settings indicated in the schedule are valid for most cases.
The setting of the fan output according to the installation should normally be done only through the air
damper. Should one subsequently want to retouch also the setting of the combustion head, with the
burner running, operate on the rod (1) with a 6 mm spanner (2) as follows:
TURN TO THE RIGHT : (sign +)
In order to increase the volume of air entering the combustion chamber and thus diminishing its pres-
sure.
There is a reduction of CO
advisable for ignitions at low temperatures).
TURN TO THE LEFT : (sign –)
In order to reduce the volume of air entering the combustion chamber and thus increasing its pressure.
The CO improves and the adhesion of the flame to the diffuser tends to reduce. (This setting is not
2
advisable for ignitions at low temperatures).
In any case do not bring the combustion head setting more than one point away from that indicated in
the schedule. One set-point corresponds to 3 turns of the rod; a hole (3) at its end facilitates counting
the number of turns.
2136
Nozzle
(Only type 489 T53)
2
5 3 1
Regulating rod
Shutter
and the adhesion of the flame to the air diffuser disc improves. (Setting
2
Pump Comb. head
Pressure adjustment
bar Set-point
8
8
8
7
Air damper
adjustment
Set-point
– 3.8
– 4.0
2.5 3.9
2
1
6
D5233
3