Riello RG3D L Installation, Use And Maintenance Instructions page 58

3.4 HYDRAULIC SYSTEMS
WARNING
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).
SYSTEM NOT PERMITTED
IN GERMANY
*
D5338
PRIMING PUMP
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;
3363
H
meters
Fig. 8 0.5
1
1.5
2
1 - Suction line
2 - Return line
3 - By-pass screw
4 - Gauge connection
5 - 2 nd stage pressure adjuster
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
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
S7067
L meters
H
ø i ø i
meters
8 mm 10 mm
0 35 100
0.5 30 100
1 25 100
1.5 20 90
2 15 70
3 8 30
3.5 6 20
Fig. 10
D5337