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Boiler Connections
Boiler in Heating/Cooling
Legend
A Heating/Cooling unit
B Spring-loaded flow check valve
C Circulation pump
D Safety header with automatic air vent and
pressure relief valve
E Expansion tank
F Water chiller
G Boiler circuit pump (field supplied)
44
Vitodens 200-W B2HA 80 to 100, 285 to 352 Installation
Boiler in heating/cooling application
The boiler, when used in connection with a refrigeration
system, must be installed ensuring the chilled medium
is piped in parallel to the boiler with appropriate valves
to prevent the chilled medium from entering the boiler.
See illustration on the left.
The boiler piping system of a hot water heating boiler
connected to heating coils located in air handling units
where they may be exposed to refrigerated air circulation
must be equipped with flow control valves or other
automatic means to prevent gravity circulation of the
boiler water during the cooling cycle.
Check installation instructions of the chiller manufacturer
carefully for additional requirements.
Cooling season starts:
Close valve "v1" and open valve "v2".
Heating season starts:
Close valve "v2" and open valve "v1".
IMPORTANT
Viessmann strongly suggests that the
valves illustrated be labelled "v1" and "v2".
IMPORTANT
In the illustration, the circulating pump
must be operated from a separate on/off
switch, not from the pump aquastat on
the boiler control.
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