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4.12.1 Hydraulic connections
The pumps are equipped with a by-pass that separates return line
with suction line (Fig. 25).
The pumps are installed on the burner with the by-pass closed by
screw 6)(Fig. 27 at page 23).
It is therefore necessary to connect both hoses to the pump.
The pump seal will be damaged immediately if it is
run with the return line closed and the by-pass
screw inserted.
WARNING
Remove the plugs from the suction and return connections of
the pump.
Insert the hose connections with the supplied seals into the
connections and screw them down.
Take care that the hoses are not stretched or twisted during
installation.
Install the hoses where they cannot be stepped on or come
into contact with hot surfaces of the boiler.
Now connect the other end of the hoses to the suction and
return lines.
4.12.2 Hydraulic system layout
Key (Fig. 26)
1
Pump suction
2
Solenoid valve
3
Pump
4
Pressure regulator
5
Return pipe
6
By-pas screw
7
Pump return
8
Solenoid valve
9
Solenoid valve
10 Piping
11 Filter
12 Piping
13 Pressure regulator
14 Servomotor
M
Pressure gauge
P
Oil pressure switch
SM Servomotor
V
Vacuum gauge
20109674
Installation
D10531
22
GB
Fig. 25
D2444
Fig. 26
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