Central Heating System - Rinnai E50CRN Manuel D'installation

6.1 Central heating system

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NOTICE
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NOTICE
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NOTICE
Boiler basic piping
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Connect the central heating system according to its instructions.
When removing the plastic sealing caps from the pipes, water may come out
of the boiler due to live fire testing during manufacturing.
The boiler, when used in connection with a refrigeration system, must be
installed so the chilled medium is piped in parallel with the boiler with appropriate
valves to prevent the chilled medium from entering the boiler.
The boiler piping system of a hot water 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.
Some installations with multiple zone valves may require a differential bypass,
this will prevent excessively high flow rates through a single zone when the
other zone valves are closed.
fig. 5