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Pressure switch
The pressure switch is a safety accessory and is
required for every boiler to EN 303 with pressure-jet
burners to EN 676 (third party burners) for shutting
down the burner in case of flue gas back pressure/
condensate banked up in the boiler/flue system.
The adjustable, interlocking pressure switch is connec-
ted to the control unit safety chain, and to an additional
pressure measuring connector for "combustion cham-
ber pressure". The control unit safety chain is connec-
ted in series to the maximum pressure switch, the min-
imum pressure switch and the high limit safety cut-out.
A setting of approx. 2 mbar above the actual combus-
tion room pressure in full load operation ensures the
burner will shut down used in the event of a fault. The
pressure is measured in full load operation upstream
of the pressure switch.
Note
The hose for measuring the pressure is also connec-
ted to the combustion chamber sight glass.
"Pressure switch set" installation instructions
Information on commissioning
Service instructions for boiler and boiler control
unit plus separate burner documentation
Pressure switch
5457357
