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5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
System Layout
System Layout 1
V
itocrossal 300, CA3 with...
- DHW storage tank
- one heating circuit without mixing valve
- two heating circuits with a mixing valve
Installation of different heating circuits...
■
high-temp. circuit (radiator heating circuit)
■
low-temp. circuit (under floor heating circuit with
3-way mixing valve)
■
DHW production
The 3-way mixing valve, built-in to achieve the low-
temperature level of the under floor heating circuit, is
controlled by an accessory kit for a heating circuit with
mixing valve.
System separation is required of underfloor heating
systems employing non-oxygen diffusion barrier tubing.
All components on the secondary side of the heat
exchanger must be made of corrosion-resistant materials.
IMPORTANT
Legend
A
Vitocrossal 300, CA3 boiler
B
Outdoor temperature sensor
!
C
Low temperature heating circuit
D
High temperature heating circuit
E
Heating circuit pump
F
Mixing valve temperature sensor
?
G
Mixing valve with actuator
H
Domestic hot water storage tank
I
DHW tank temperature sensor
%
J
Expansion tank
K
Boiler pump/system pump
sL
*
L
DHW pump
sA
M
Low loss header
N
System supply temperature sensor
§
/
?
* When using single speed boiler/system pumps,
a hydronic pressure bypass may be required.
O
Hydronic pressure bypass (if required)
