Boiler Piping In Heating/Cooling Application - Viessmann Vitocrossal 300 CT3 Series Installation Instructions Manual

Boiler Connections

Boiler Piping in Heating/Cooling Application

Legend
A System supply
B System return
C Valve
D Flow-check valve
E Circulation pump
F Automatic feed valve
G Pre-charged expansion tank
16
Cooling unit
Heating/
Cooling unit
Heating/
Cooling unit
Heating/
Water
chiller
Vitocrossal 300, CT3 Series Installation
The boiler, when used in connection with a refrigeration
system, must be installed so that the chilled medium
is piped in parallel to the boiler with appropriate valves
to prevent the chilled medium from entering the boiler.
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 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.
IMPORTANT
In the above system, the circulating pump must be
operated from a separate on/off switch - not from the
boiler control.