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Riello P 450 P/G Instructions Pour L'installation, L'utilisation Et L'entretien page 61

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Fig. 3
1 - Pressure switch plug
2 - Manometer for pressure in delivery line
3 - Manometer for pressure in return line
4 - Eccentric adjusting screw
5 - Ring for piston stop
The eccentric (8) setting should be carried out as follows:
remove the cover (9), loosen the screws (7), and act on the screw (4) to obtain the desired eccentricity. Turn
clockwise (+) the screw (4) to increase the eccentricity, increasing the difference between the min. and max.
capacity of the nozzle; turn anticlockwise (-) to decrease the eccentricity and, consequently the difference between
the min. and max. capacity of the nozzle.
NB.
The proper setting of the eccentric (8) is possible when its operation field follows the servomotor operation
field (20°÷130°): so, that any variation of the servomotor position corresponds to a pressure variation.
Never let the piston batter: the stop ring (5) determines the max. stroke.
When the setting is carried out, verify manually that no slow-down occurs between 20° and 130° and further
the maximum and minimum pressures correspond to those chosen as per diagram of page 10.
If you wish to check the delivery capacity of the nozzle, proceed as follows:
Open the burner according to instructions at page 3, place the nozzle, simulate the start-up and then proceed
with the weighing at the maximum and minimum pressures.
If at maximum capacity of the nozzle (maximum pressure in the return line) pressure fluctuations are
detected on the manometer (3), slightly decrease the pressure till their complete elimination.
5483
PRESSURE CONTROLLER
2
3
1
5
6 - Nut and lock-nut for piston rating
7 - Eccentric locking screws
8 - Variable eccentric
9 - Cover
11
GB
6
9
7
8
D2001
4

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