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Mounting the burner
■
Max. flame tube aperture Ø 230 mm.
Cut out the thermal insulation mat in the boiler door
to suit the flame tube diameter.
After mounting the burner, seal the annular gap
■
between the flame tube and the thermal insulation
block with the flame tube gasket supplied.
Fig. 24
Pressure switch
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.
Commissioning information
Service instructions for boiler, burner and boiler
control unit
(cont.)
Note
The flame tube must protrude at least 110 mm into the
boiler from the front edge of the burner plate.
To safeguard perfect operation, maintain the required
minimum flame tube length.
Note
The hose for measuring the pressure is also connec-
ted to the combustion chamber sight glass.
"Pressure switch set" installation instructions
27
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