Rinnai E75CN - Manual (Page 20)

Installation & Servicing Instructions Rinnai E-Series
20
6.1.2 Safety valve
An ASME 30 psi pressure relief valve is installed on the plumbing kit included
with the boiler.
6.1.3 Low water cut off
The Rinnai E boiler has a factory installed pressure switch type Low Water Cut
Off (LWCO). Check your local codes to see if a Low Water Cut Off is required
(LWCO) and if this device conforms to local code. See the Rinnai Boiler
Applications Manual for further information.
The Low water cut off is not serviceable.
6.2 Expansion tank
The E-Series boilers are equiped with an internal expansion tank.
The tank of the E75CN and E75CP is positioned inside the boiler casing. This
expansion tank has a pre-charge pressure of 14.5 PSI / 1 Bar and a capacity of 2.1
gallon / 8 litres.
The tank of the E110CN and E110CP is positioned directly beneath the boiler and
together with the casing forms a single entity with the boiler.
The casing can be removed by pulling forwards. The expansion tank has a pre-charge
pressure of 14.5 PSI / 1 Bar and a capacity of 3.1 gallon / 12 litres.
If a larger capacity expansion tank is needed for the installation a standard expansion
vessel should be fitted additionally.
In that case choose an expansion tank volume, of which the summary is geared to
the installation’s water capacity. The pre-charge pressure depends on the installation
height above the expansion tank. Fit the expansion tank into the return pipe as close
as possible to the boiler. The extra expansion tank should be sourced locally. Please
refer to the expansion tank manufacturer for further information.
Fill the expansion tank to a minimum of 14.5 psi.
NOTICE
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NOTICE
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NOTICE
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