Riello RDB3 CF 489T50 - Bolts for Flange to be Fixed to Boiler; Hydraulic Systems

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3.3 HYDRAULIC SYSTEMS
■ Check periodically the flexible pipes conditions.
Using kerosene, they have to be replaced at least every 2 years.
■ A metal bowl filter with replaceable micronic filter must be fitted in the oil supply pipe.
H = difference of level L = Max. lenght of the suction line I.D. = Interminal diameter of the oil pipes
Fig. 5
D5912
2
3
4
7
6
5
18
■ The pump is designed to allow working with one pipe.
In order to obtain two pipes working it is necessary to
unscrew the return plug (2), screw the by-pass screw (3)
and then screw again the plug (2). (See fig. 5).
■ In the two pipes systems, before starting the burner make
sure that the return pipe-line is not clogged. An excessive
back pressure would cause the damage of the pump seal.
WARNING:
H
meters
L meters
I. D.
8 mm
I. D.
10 mm
0
0.5
1
1.5
2
3
3.5
35
30
25
20
15
8
6
100
100
100
90
70
30
20
1 - Suction line
2 - Return line
3 - By-pass screw
4 - Gauge connection
5 - Pressure adjuster
6 - Suction gauge connection
7 - Valve
8 - Auxiliary pressure test point
PRIMING PUMP:
On the system in fig. 6 it is sufficient to loosen the suction gauge
connection (6, fig. 5) and wait until oil flows out.
On the systems in fig. 7 and 8 start the burner and wait for the priming.
Should lock-out occur prior to the arrival of the fuel, await at least 20 sec-
onds before repeating the operation.
The pump suction should not exceed a maximum of 0,4 bar (30 cm Hg).
Beyond this limit gas is released from the oil. Oil pipes must be completely
tight.
In the vacuum systems (fig. 8) the return line should terminate within the
oil tank at the same level as the suction line. In this case a non-return
valve is not required. Should however the return line arrive over the
fuel level, a non-return valve is required. This solution however is less
safe than previous one, due to the possibility of leakage of the valve.
H
meters
L meters
I. D.
8 mm
I. D.
10 mm
0.5
1
1.5
2
10
20
40
60
20
40
80
100
max. 4 m
H
H
D1560
Fig. 7
D1558
max. 4 m
H
H
Fig. 8
H
max. 4 m
min. 0.1 m
D1559
Fig. 6