Riello P 140P/NA Installation, Use And Maintenance Instructions page 41

Viscosity
at nozzle
Nozzle
15 AG 45°
cSt
5
10
250
20
30
5
10
275
20
30
5
10
300
20
30
*
flow not allowed for a correct combustion.
5.2.2 PRESSURE REGULATOR ADJUSTMENT
Pressure variation (pressure gauge 1, fig. 10) modifies oil output flowing out the nozzle.
To calibrate the oil range within which the nozzle should operate, adequately adjust the fuel maximum and minimum pressure ac-
cording to the nozzle chart.
- Once the nozzle is installed, remove the servomotor protection cover (12, fig. 1), and start up the burner.
- As soon as it is started, cut off voltage to the servomotor by opening the connector located on the switchboard (19, fig. 1). In this
way the burner operates at minimum flow.
- Release the variable profile cam of the servomotor by pressing the reset button (5, fig. 8).
- Manually make the variable profile cam firmly connected to the eccentric (7, fig. 10) rotate slowly and check the pressure variation
on the pressure gauge (1, fig. 10). Pressure and nozzle delivery are minimum when the servomotor is at 20°. Pressure and nozzle
delivery are maximum when the servomotor is at 130°.
Correct pressure on the return line by varying the eccentric (7, fig. 10) and the nut with the lock nut (5, fig. 10).
5.2.3 PRESSURE REGULATOR
2
D3699
To calibrate the eccentric (7):
remove the casing (8), undo the screws (6), operate on the screw (3) until the desired eccentricity is obtained. Turn the screw (3) to
the right (marked +) to increase eccentricity and also the difference between the nozzle maximum and minimum flow. Turn the
screw (3) to the left (marked +) to reduce eccentricity and also the difference between the nozzle maximum and minimum flow.
2544500
Oil density
3
kg/hm 6 bar 5 bar
850 468 410
875 396 340
900 315 252
925 285 228
850 514 430
875 436 365
900 346 277
925 313 250
850 560 470
875 476 410
900 378 302
925 342 273
1
Oil flow
kg/h consumption in kg/h
4 bar 3 bar 2 bar
340 250 120
270 180 80
175 110 N/A*
150 85 N/A*
360 270 130
300 190 85
193 120 N/A*
175 95 N/A*
400 300 150
340 200 90
210 130 N/A*
190 100 N/A*
4
1 - Delivery pressure gauge
2 - Air/steam pressure gauge
3 - Eccentric adjusting screw
4 - Piston snap ring
5 - Piston calibration nut and lock nut
6 - Eccentric locking screws
7 - Variable eccentric
8 - Casing
9 GB
Recommended
Air/steam
air/steam
pressure
High Low
bar
flame flame
10.4 35.2
24.5 57.1
42.4 81.9
46.8 90.5
11.5 38.6
27 62.8
46.7 90
51.6 99.5
11.5 38.6
29.3 68.5
51 98.2
56.3 108.6
Fig. 10
5
8 6 7
3
2
3
4
4
2
3
4
4
2
3
4
4