Rinnai E50C Installation & Servicing Instructions Manual page 16

6.1 Central heating system
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Thermostat
Boiler basic piping
16
Connect the central heating system according to its instructions.
The boiler pipes can be connected to the installation by means of compression fi ttings.
Reducers should be used for connecting to thick-walled pipe (welded or threaded).
When removing the plastic sealing caps from the pipes, dirty testing water may
drain from the boiler.
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 fl ow 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 fl ow rates through a single zone when the
other zone valves are closed.
Optional LWCO
Air
Separator
Bypass for system
flushing only
P
T
Pressure
gauge
Purge Station
Dirt
Trap
Manual Fill
Back flow
Valve
P preventer Ball valve
5
Automatic Fill
Valve
fi g. 5