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5773 597 - 04
Vitocrossal 200, CM2 400, 500 and 620 Installation
Boiler Connections
Water Side Connection
Note:
Make all connections free of load and torque stresses.
The existing heating system must be properly flushed,
especially if the Vitocrossal 200 boiler is connected to
an existing heating system in a retrofit application.
See page 9 for details.
Connect the system to the boiler according the diagram
on page 16.
Note:
All connections which are not being utilized for
water connections or for controls must be properly
closed.
The supplied air vent and pressure relief valve must be
installed on the top of the boiler - the alternate pressure
relief valve location may be in the boiler supply line. The
piping to the precharged expansion tank, as well as any
automatic feed water required, must be connected to
the boiler drain opening or the safety return connection.
Boiler pump shall be installed on return pipe, pumping
water into the boiler.
The supplied low water cut-off should be installed directly
on top of the boiler or may be installed in the boiler return
piping above the pressure vessel.
Note:
Piping diagrams for specific system layouts are
available. Please enquire with your local Viessmann
sales representative.
IMPORTANT
The Vitocrossal 200 is only suited for hot water heating.
Do not install a 4-way mixing valve, bypass valve or
similar.
Boiler
