Viessmann VITOCROSSAL 200 CI2 Series Installation Instructions Manual page 14

Installation
Boiler Connections
IMPORTANT
The Vitocrossal 200, CI2 boiler is only suited for hot
water heating. Do not install a 4-way mixing valve.
14
(continued)
The heating system must be properly flushed, especially if
the Vitocrossal 200, CI2 boiler is connected to an existing
heating system in a retrofit application.
Refer to page 8 for details.
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 supply header 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 return. Boiler pump shall be installed on
return pipe, pumping water into the boiler.
The supplied low water cut-off should be installed directly
on the safety header of the boiler or may be installed in
the boiler piping above the pressure vessel.
Note: Piping diagrams for specific system layouts are
available. Please enquire with your local Viessmann
sales representative.
All Vitocrossal 200 boilers are hydrostatically factory
tested to ASME requirements.
Safety Header
CAUTION
Do not connect heating system to safety header.
1. Locate safety header on the main supply header.
Max. allowable working pressure (MAWP): .... 80 psi (5.5 bar)
Min. water pressure: ..............................15 psi (1.0 bar)
Note: The minimum water pressure is necessary for safe
operation.
Note: All boilers must have a pressure relief valve.
WARNING
Exposing the boiler to pressures and temperatures in
excess of those listed will result in damages, and will
render warranty null and void.
Note: Make all connections free of load and torque stresses.
Legend
A Boiler supply
B Boiler return
C Precharged expansion tank
D Automatic fill
Vitocrossal 200 CI2 Installation