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Viessmann AirflowPLUS AH2A Installation, Operating and Service
System Layout 7
Legend
A Vitocrossal 300 CU3A high mass boiler / Vitodens
200 B2HA/B boilers (shown)
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)
Note: For installations with multiple air handler units,
the call for heat from each air handler must be
connected in parallel to the boiler demand.
Note: The low loss header is optional with the Vitocrossal
300 CU3A boiler.
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.
Additional Information
55
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