29Installing the System Piping
CAUTION
Ensure that the pressure relief valve is closed
before testing or operating the system.
3.4.1 Built-in Water Fill Connection
The Navien NCB-H 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.
Backflow
Preventer
Make-
up
Water
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 Filling the System
Before filling the boiler, open the pressure relief
valve by lifting the lever on top, and loosen the air
vent cap to allow the system to fill properly. Close
the pressure relief valve when the system is full.
Air Vent
Cap
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