9
BURNER FIRING
Close load controls and set switch 1)(A) to “MAN”.
After burner firing a complete burner adjustment should
be performed.
BURNER CALIBRATION
The optimum calibration of the burner requires an analy-
sis of the flue gases at the boiler outlet.
The following settings that have already been made do
not require modification under normal circumstances:
• Combustion head;
• Servomotor, red and blue cams
The settings listed below must be adjusted in sequence:
1 - MAX burner output
2 - MIN burner output
3 - Intermediate outputs between MAX and MIN output
1 - MAX power
Max output of the burner must be set within the firing rate
range shown on page 5.
In the above instructions we left the burner running in
MIN output operation. Now press button 2)(A) “+” until
servomotor arrives at 90°.
Adjusting the nozzle flow rate
The nozzle flow rate varies according to the fuel pres-
sure on the nozzle return. Diagram (C) indicates this
relationship for type A4 return flow nozzles with pump
delivery pressure of 290 PSI.
Diagrams (C):
Horizontal axis
: GPH, nozzle flow rate
Vertical axis
: PSI, nozzle return pressure
NOTE
With a pump delivery pressure of 290 PSI, the pressure
on the nozzle return must not exceed 246.5 PSI.
The pressure difference between pump delivery and
nozzle return must be at least 43.5 PSI. With smaller
pressure differences, the pressure on the nozzle return
can be unstable.
To fix the maximum nozzle flow rate, vary the final profile
on the upper cam 7)(B) via the screws 8).
The nozzle return pressure value is indicated by the
pressure gauge 10).
Key (B)
1 Servomotor
2 Reset
3 Servomotor cover
4 Cam for controlling air damper
5 Cam 4) adjustable screws
6 Opening for access to screws 5)
7 Cam for controlling pressure regulator
8 Cam 7) adjustable screws
9 Pressure regulator
10 Gauge for pressure on nozzle return
11 Air damper
12 Index
All the installation, maintenance and
disassembly operations must be carried
out with the electricity supply
disconnected.
The installation of the burner must be
carried out by qualified personnel, as
indicated in this manual and in compliance
with the standards and regulations of the
laws in force.
(A)
(B)
1
2
D791
D2523
(C)
D2321
Type A4
The values indicated in the curves, refer to the data printed on the nozzle.
DANGER
WARNING
Summary of Contents for 9511300
Page 2: ...Original instructions...
