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5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
System Layout
System Layout 2
Multiple (up to eight boiler sections) Vitocrossal 300, CA3 with...
- multiple heating circuits with mixing valves
- low-loss header
Legend
A
Vitocrossal 300, CA3 boiler
B
Low-loss header/common supply temperature
sensor
§
/
?
on lead boiler
C
Low-loss
header
D
DHW storage tank
E
High temperature heating circuit
F
Low temperature heating circuit
G
Hydronic pressure bypass (if required)
H
Connection to BMS (BACnet/MODbus)
I
Heating
system
J
Variable speed pump control (field supplied)
*
Optional accessory (depending on system layout
and
configuration)
When designing a multiple Vitocrossal 300, CA3 system
as shown above, please reference applicable multiple
Vitocrossal 300, CA3 technical documentation, and
contact your local Viessmann Sales Representative for
further assistance.
This installation example depicts a possible piping layout
for multiple Vitocrossal 300, CA3 boilers equipped with
Viessmann System Technology. Please note that this
example is based on a simplified conceptual drawing only!
Piping and necessary componentry must be field verified.
A low water cut-off (LWCO) must be installed where
required by local codes.
Proper installation and functionality in the field is the
responsibility of the heating contractor.
WARNING
If a DHW storage tank other than a Viessmann Vitocell
100 or 300 tank is used, the installer must verify
proper operation of the Viessmann DHW tank
temperature sensor with the original manufacturer of
the tank. Viessmann strongly recommends the
installation of a temperature tempering valve in the
DHW supply line.
Note:
When using single speed boiler/system pumps,
a hydronic pressure bypass may be required.
