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Additional Information
System Layout 2
Legend
A Vitocrossal 300 CU3A high mass boiler
B System fill with expansion tank
C High temperature heating loop
D Viessmann AirflowPLUS air handler
E Thermostat (field supplied)
F Low temperature heating loop with mixing valve
G Indirect fired DHW storage tank
H Low loss header (or closely spaced tees)
Refer to page 24 for the Viessmann AirflowPLUS
connection to external heat demand of the boiler.
50
Viessmann AirflowPLUS AH2A Installation, Operating and Service
IMPORTANT
The use of a low-loss header (or closely spaced tees
with a maximum spacing of 4X pipe diameter) is strongly
recommended if the maximum water flow rate in the
application concerned exceeds the maximum or minimum
flow rates of the boiler or if the system flow rates are
unknown.
The low-loss header is available as accessory part.
Please note location of expansion tank.
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.
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.
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