Installation and operating instruction
Oil burner WL40Z-A
3 Product description
83298002 3/2019-11 La
11-112
3.3.2 Oil supply
Oil pump
The pump draws the oil through the supply line and carries it under pressure to the
oil nozzle. The pressure regulating valve keeps the oil pressure constant.
Solenoid valves
The solenoid valves open and close the oil supply.
For ignition, the combustion manager opens the stage 1 solenoid valve and the
safety solenoid valve. Stage 2 solenoid valve opens or closes depending on heat
demand.
Minimum oil pressure switch (optional)
Depending on the burner application, optional equipment may be required for op-
timum operation [ch. 12.3].
The minimum oil pressure switch monitors the pump pressure in the supply. If the
preset pressure is not achieved, the combustion manager initiates a lockout.
Sequence diagram
Standard / continuous operation
with oil pressure switch
P
1
4
3
7
5
6
8
1
2
4
3
5
6
1
Oil pump on burner
2
Safety solenoid valve
3
Stage 1 solenoid valve
4
Nozzle head with 2 nozzles
5
Throttle orifice (Ø 1.2 mm) incorporated in screwed union
6
Stage 2 solenoid valve
7
Minimum oil pressure switch (optional)
8
Additional solenoid valve (with minimum oil pressure switch)
