Pressure Switch; Commissioning Information - Viessmann VITOROND 200 Installation Instructions Manual

Mounting the burner
Note
The flame tube must protrude at least 125 mm from
the front edge of the burner flange into the boiler.
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.
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
Viessmann Werke GmbH & Co. KG
D-35107 Allendorf
Telephone: +49 6452 70-0
Fax: +49 6452 70-2780
www.viessmann.com
28
(cont.)
Note
The pressure measuring hose is likewise connected to
the combustion chamber sight glass.
Installation instructions for "pressure switch set"
Viessmann Limited
Hortonwood 30, Telford
Shropshire, TF1 7YP, GB
Telephone: +44 1952 675000
Fax: +44 1952 675040
E-mail: info-uk@viessmann.com