Table of Contents
Advertisement
5.12.3 Hydraulic connections
The pumps are equipped with a by-pass that connects return line
with suction line.
The pumps are installed on the burner with the by-pass closed by
screw 6)( Fig. 23).
It is therefore necessary to connect both hoses to the pump.
The pump will break down immediately if it is run with the return
line closed and the by-pass screw inserted.
Remove the plugs from the suction and return connections of the
pump.
5.12.4 Hydraulic system layout
1
Key to layout (Fig. 22)
1
Pump suction
2
Pump and nozzle return
3
By-pass screw in pump
4
Pump pressure governor
5
Safety solenoid
6
Safety solenoid
7
Nozzle delivery
8
Nozzle without interception pin
9
Nozzle return
10 Pressure regulator on nozzle return
11 Servomotor
12 Pressure switch on nozzle return
13 Safety valve on nozzle return
14 Safety valve on nozzle return
15 Pressure switch on pump delivery
B
Oil valve assembly and pressure variator
M
Pressure gauge
V
Vacuometer
15
P
V
M
3
4
2
Installation
Insert the hose connections with the supplied seals into the con-
nections and screw them down.
Take care that the hoses are not stretched or twisted during in-
stallation.
Install the hoses where they cannot be stepped on or come into
contact with hot surfaces of the boiler and where they do not
hamper the opening of the burner.
Now connect the other end of the hoses to the suction and return
lines by using the supplied nipples.
SM
M
6
5
10
14
13
OPERATION
•
Pre-purging phase: of closed valves 5), 6), 13) and 14).
•
Firing phase and operation: of opened valves 5), 6), 13)
and 14).
•
Halt: All the valves closed.
23
GB
7
8
9
B
M
11
SM
12
P
D8362
Fig. 22
20027766
Advertisement
Table of Contents
