Boiler In Heating/Cooling Application - Viessmann VITODENS 100-W WB1B Series Installation And Service Instructions Manual

Boiler Connections
Installation Examples

Boiler in heating/cooling application

Fig. 30
A Heating/Cooling unit
B Spring-loaded flow check valve
C Circulation pump
D Expansion tank
E Water chiller
F Boiler circuit pump (field supplied)
34
(continued)
IMPORTANT
Viessmann strongly suggests that the
valves pictured above be labelled "v1"
and "v2".
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.