System Fill Connection - Navien NCB-150E Installation & Operation Manual

Maintenance
Periodically monitor the level of media in the neutralizer and test
the pH level at the outlet. We recommend an annual pH test using
recognized test strips or an electronic pH meter to obtain precise
measurements. Replace the neutralizing media when the pH drops
below the minimum level required by the local water authority. If
the pH level is not specified, replace the neutralizing media when
the pH is below 6.0. For replacement media, contact your local
Navien distributor.

3.4 System Fill Connection

Before filling the boiler, open the pressure relief valve by lifting the
lever on top, and open the air vent cap to allow the system to fill
properly. Close the pressure relief valve when the system is full.
CAUTION
Ensure that the pressure relie valve is closed before testing or
operating the system.
26 Installing the System Piping
3.4.1 Built-in Water Fill Connection
Navien NCB-E boiler is equipped with an auto-feeding water
connection and motorized feeding valve. Therefore, installation
of additional system water fill connection is not necessary in
most cases. See the following figure for an example of a water fill
installation using the built-in connection.
3.4.2 External Water Fill Connection
External water fill connection may be installed on the system
piping if it is required for specific applications. See the following
figure for an example of external water fill installation on the
system piping.
Air Vent Cap
Circulator
To System
Make-up
Water
Backflow Preventer
Make-up Water
Air Separator
Expansion Tank
From
System