45
Bentone B40 MF/B45-2 MF
For installers
7.7 Return Oil Pressure Switch
The pressure switch ensures that pressure at the return oil side of the burner
does not become high enough to cause the oil valves in the nozzle holder
to open and discharge oil during aeration and fl ushing. These valves are
held closed by springs and open at a pressure of approx. 10 bar. When the
pressure exceeds 3 bar, the switch will trigger and shut down the burner in
order to prevent the oil from passing through the valves. The burner enters
blocking mode when the pressure switch is connected to the operating
circuit in the burner’s electrical system. The pressure switch must be reset
manually by pressing in the red button on the switch next to the pressure
scale.
The pressure switch may be set to max. 3.5 bar, which is the highest
pressure for which the oil pump is designed at the return side. Setting a
higher pressure will damage the gaskets in the pump.
Press switch setting
Reset button
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