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Additional Information
System Layout 8
Legend
A Vitodens 200 B2HA/B boilers
B System fill with expansion tank
C Thermostat (field supplied)
D Viessmann AirflowPLUS air handler
E Low loss header (or closely spaced tees)
Refer to page 24 for the Viessmann AirflowPLUS
connection to external heat demand of the boiler.
56
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.
Sizing of field-supplied pumps are critical for proper boiler
operation in this system layout. An undersized pump may
cause short-cycling and/or improper operation of the boiler.
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