20017786
20
Installation
4.8
Combustion head setting
Installation operations are now at the stage where the blast tube
and sleeve are secured to the boiler as shown in Fig. 15.
It is now a very simple matter to set up the combustion head, as
this depends solely on the MAX output developed by the burner.
It is therefore essential to establish this value before proceeding
to set up the combustion head.
There are two adjustments to make on the head: air and gas de-
liveries.
In diagram (Fig. 16) find the notch to use for adjusting the air
and the gas, and then proceed as follows:
Air adjustment
Turn screw 2)(Fig. 15) until the notch identified is aligned with
the front surface 1)(Fig. 15) of the flange.
Gas adjustment
Loosen the 3 screws 4)(Fig. 15) and turn ring 5) until the
notch identified is aligned with index 6).
Tighten the 3 screws 4) fully down.
Example RS 70/E
MAX output = 2200 MBtu/hr.
If we consult diagram (Fig. 16) we find that for this output, air must
be adjusted using notch 3) on screw 2)(Fig. 15).
Diagram (Fig. 16) shows the ideal settings for the ring
5)(Fig. 15). If the gas main pressure is too low to reach the max-
imum output operation pressure indicated on
and if the
ring 5)(Fig. 15) is not fully open, it can be opened wider by 1 or
2 notches.
Continuing with the previous example, page 23 indicates that for
burner RS 70/E with output of 2200 MBtu/hr a pressure of ap-
proximately 2.36 “WC is necessary at test point 3)(Fig. 15).
If the pressure cannot be reached, open the ring 5)(Fig. 15) to
notch 4 or 5.
Make sure that the combustion characteristics are satisfactory
and free of pulsations.
2
1
3
4
5
6
Fig. 15
D9804
Fig. 16
D2392
Maximum burner output
Notches (Air=Gas)
