Pressure Switch - Viessmann Vitoplex 100 Installation Instructions For Contractors

Mounting the burner
Burner weight subject to centre of gravity
300
250
200
150
100
50
0
0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00
Distance of boiler centre of gravity
to the boiler door in m
Fig. 24
PV1B 1350 to 2000 kW
A
PV1B 780 to 1120 kW
B
Example for rated heating output 1350 kW:
A burner with a centre of gravity at a distance of 1 m
from the boiler door may not weigh more than 200 kg.
Information on the diagram
The weight refers to the total weight in kg, incl. all fitted
components. The centre of gravity is measured from
the door.
Mounting the burner
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 function, maintain the
required minimum blast tube length.

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.
24
(cont.)
A
B
2. After mounting the burner, seal the annular gap
between the flame tube and the thermal insulation
block with the flame tube gasket supplied.
!
Please note
An annular gap between the flame tube and
thermal insulation block may result in dam-
age to the boiler door as a consequence of
excessively high temperatures.
Carefully seal the annular gap.
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