Water Side Connections - Viessmann Vitocrossal 300 CT3 Series Installation Instructions Manual

Boiler Connections

Water Side Connections

Air vent and
pressure
gage
Condensate
drain
Legend
A High temp. heating loop
B Low temp. heating loop
C Pressure relief valve (must be installed within first
12 in. (305 mm) of piping)
D Safety supply - alternate pressure relief valve location
and additional supply
E Drain valve
F Precharged expansion tank
G Automatic fill
H Low water cut-off (install low water cut-off in boiler
supply or boiler return with min. height at boiler
supply)
I Temperature gauge. Install temperature gauge
as close as possible to the boiler supply line.
14
1. The existing heating system must be properly flushed,
2. Connect the boiler to the system according the
Boiler
supply
3. The supplied air vent and pressure relief valve must
Flue gas damper
Vent pipe
4. The supplied low water cut-off should be installed
Note: - Piping diagrams for specific system layouts
Vitocrossal 300, CT3 Series Installation
especially if the Vitocrossal 300 boiler is connected
to an existing heating system in a retrofit application.
diagram. The sizes of all connections are given
in the table on page 30. The Vitocrossal 300
boiler has two boiler return connections. If the
heating system to be connected to the Vitocrossal
300 has two separate heating loops or circuits,
the heating circuit or loop with the lower return
temperature should be connected to boiler return.
1. All connections which are not being utilized for
water connections or for controls must be properly
closed.
be installed on the top of the boiler - the alternate
pressure relief valve location may be in the safety
supply. 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.
in the boiler return piping above the pressure vessel
or may be installed directly on top of the boiler.
are available. Please enquire with your local
Viessmann sales representative.