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5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Boiler Piping in Heating/Cooling Application
Legend
A
System supply
B
System return
C
Valve
D
Supply check valve
E
Circulation pump
F
Automatic feed valve
G
Pre-charged expansion tank
The Vitocrossal 300, CA3 boiler, when used in connection
with a refrigeration system, must be installed so that the
chilled medium is piped in parallel to the boiler and with
appropriate valves to prevent the chilled medium from
entering the boiler.
The boiler piping system of a hot water heating boiler is
connected to the heating coils located in the air handling
units. The boiler piping system may be exposed to
refrigerated air circulation and must be equipped with flow
control valves or other automatic means to prevent gravity
circulation of the boiler water during the cooling cycle.
Check the 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.
Metal tags labelling these valves should be attached.
IMPORTANT
In the above system, the circulating pump must be
operated from a separate on/off switch - not from the
boiler control.
Heating /
Cooling unit
Heating /
Cooling unit
Heating /
Cooling unit
Water
Chiller
System Layout
