37
5354 788 - 03
Vitorond 200, VD2A Series Installation
Additional Information
Piping in Heating/Cooling Application
The boiler, when used in connection with a refrigeration
system, must be installed so the chilled medium is piped
in parallel to the boiler with appropriate valves to prevent
the chilled medium from entering the boiler.
The 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 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.
A metal tag should be attached to these valves
as to purpose.
Heating/
Cooling Unit
Heating/
Cooling Unit
Heating/
Cooling Unit
Water
Chiller
Boiler
Return
Boiler
Supply
Boiler piping in a heating/cooling application
IMPORTANT
In such a system, the circulating pump must be operated
from a separate on/off switch - not from the pump
aquastat on the boiler!
