Pressure Switch - Viessmann Vitoplex 200 SX2A Series Installation Instructions Manual

Mounting the burner
Rated heating output
a
b
c
d
e
f
g
h
Danger
Fibre dust can be produced if working with high
temperature insulation materials that contain zir-
conium or aluminium silicate ceramic fibres. This
fibre dust can be harmful to health.
Only trained personnel may adjust or replace
the insulation. Wear suitable protective clothing,
especially breathing equipment and safety gog-
gles.
1. Cut out the thermal insulation mat in the boiler door
to suit the flame tube diameter.
Note
The flame tube must protrude from the thermal
insulation of the boiler door.
To safeguard perfect operation, maintain the
required minimum flame tube length. See the
burner manufacturer's details.

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.
(cont.)
Number/thread
kW 700/900
Ø mm 350
Ø mm 400
mm 525
mm 785
15
º
mm
mm 150
2. After mounting the burner, seal the annular gap
between the flame tube and the thermal insulation
block with the flame tube gasket supplied.
Note
Failure to observe these instructions can result in
damage to the boiler door through excessively high
temperatures.
3. Close the boiler door. Tighten the screws cross-
wise (torque 25 Nm).
Danger
Leaks can result in a risk of poisoning
through escaping gas.
Check gaskets carefully.
Note
The pressure measuring hose is likewise connected to
the combustion chamber sight glass.
Installation instructions for "pressure switch set"
1100/1300 1600/1950
400
490
6 x M 12
580
885
30
75
640
970
170
31