Boiler In Heating And Cooling - Viessmann VITOCROSSAL 300 Installation Instructions Manual

Installation Examples
Boiler in Heating/Cooling
Legend
A Heating/Cooling unit
B Spring-loaded flow check valve
C Circulation pump
D Automatic feed valve
E Expansion tank
F Water chiller
G Boiler circuit pump (field supplied)
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Vitocrossal 300 CU3A 26 to 57 Installation
Boiler in heating/cooling application
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".
IMPORTANT
Viessmann strongly suggests that the valves illustrated
be labelled "v1" and "v2".
IMPORTANT
In the illustration, the circulating pump must be operated
from a separate on/off switch, not from the pump
aquastat on the boiler control.