Weil-McLain GOLD CGa Manual page 25

GOLD CGa Gas-Fired Water Boiler — Boiler Manual
3d
Piping — low temperature systems
3e
Water piping — refrigeration systems
Part Number 550-101-009/0107
Install boiler so that chilled medium is piped in parallel
with the heating boiler. Use appropriate valves to prevent
chilled medium from entering boiler. See Figure 18 for
typical installation of balancing valve and check valve.
If boiler is connected to heating coils located in air han-
dling units where they can be exposed to refrigerated
air, use flow control valves or other automatic means to
prevent gravity circulation during cooling cycle.
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