Boiler In A Heating/Cooling Application - Viessmann VITOGAS 100 GS1 series Installation Instructions Manual

Connections
Installation Examples

Boiler in a heating/cooling application

v2
26
(continued)
v1
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
Heating/Cooling unit
Spring-loaded flow check valve
Circulation pump
Safety header
with automatic air vent,
pressure relief valve, and
pressure gage
Expansion tank
Water chiller
IMPORTANT
We strongly suggest that the valves
pictured above be labelled "v1" and
"v2".
IMPORTANT
In the above system, the circulating
pump must be operated from a
separate on/off switch - not from the
pump aquastat on the boiler.