25
20170350
GB
Start-up, calibration and operation of the burner
7.1
Notes on safety for the first start-up
7.2
Adjustments prior to ignition (light oil)
The optimum calibration of the burner requires an analysis of the
flue gases at the boiler outlet and interventions on the following
points.
7.2.1
Nozzle
See information on page 18.
7.2.2
Combustion head
The adjustment of the combustion head already carried out on
page 20 need not to be altered unless the 2nd stage output of
the burner is changed.
7.2.3
Pump pressure
See information on page 22.
7.3
Maximum fuel flow rate adjustment
It is carried out by choosing the right nozzle in Tab. K:
Tab. K
If you want a maximum flow rate somewhere between the two
values shown in the table, select a nozzle with a higher flow rate.
Flow rate can be decreased at a later time by acting on the
pressure variator, as specified in page 26.
7
Start-up, calibration and operation of the burner
ATTENTION
The first start-up 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.
ATTENTION
Check the correct working of the adjustment,
command and safety devices.
ATTENTION
It is recommended to adjust first the light oil burner
and then the gas burner.
Carry out the fuel change with burner off.
Model
Nozzle
type
N1 - 50°
Maximum
flow rate
kg/h
Fuel pressure
at pressure gauge delivery
bar
Fuel maximum pressure at
pressure gauge return
bar
P
R
E
SS 300
P/G
330
302
24
16.5
300
290
25
17.8
275
270
25
17.5
250
246
25
17.3
225
220
25
18.0
200
188
25
18.0
180
177
28
17.8
160
160
25
17.8
PRESS 450 P/G
450
448
25
17.2
400
398
25
18.0
360
349
25
18.0
330
326
25
18.0
300
289
25
18.0
275
265
25
18.0
250
239
25
18.0
225
215
25
18.0
