Hydraulic Systems - Riello RG2KD Manuel D'entretien

3.5

HYDRAULIC SYSTEMS

ATTENTION
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.
The pump is designed to allow working with two pipes.

In order to obtain one pipe working it is necessary to unscrew the
return plug (2), remove the by-pass screw (3) and then screw again
the plug (2), (see fig. 7).
*
On the system in fig. 8 it is
sufficient to loosen the suction gauge
connection (6, fig. 7) and wait until oil flows out.
On the systems in fig. 9 and 10 start the burner
and wait for the priming.
Should lock-out occur prior to the arrival of the fuel, await at least
20 seconds 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. 10) 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 re-
quired. 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.
*
It is necessary to install a filter on the fuel supply line.
ONLY FOR ITALY: Automatic shut-off device as per Ministry of Internal Affairs' regulation no. 73 dated 7/29/71.
*
H = difference of level;
3023
Fig. 8
H
meters
0.5
1
1.5
2
1 - Suction line
D5710
2 - Return line
3 - By-pass screw
4 - Gauge connection
5 - 2 nd stage pressure
Fig. 9
L = max. length of the suction line;
Fig. 7
L meters
ø i ø i
8 mm 10 mm
10 20
20 40
40 80
60 100
6 - Suction gauge connection
7 - 1 st stage pressure adjuster
8 - Pressure reducer piston
adjuster
9 - 2 nd stage valve
10 - 1 st stage valve
11 - Auxiliary pressure test point
I. D. = internal diameter of the oil pipes.
5 GB
4
S7067
L meters
H
ø i
meters
8 mm
0 35
0.5 30
1 25
1.5 20
2 15
3 8
3.5 6
Fig. 10
*
ø i
10 mm
100
100
100
90
70
30
20
D5711