Navien NFB-175H Installation Manual page 27

3.2.1 Condensate Neutralizer Kit
WARNING
To avoid damaging the appliance, the
●
neutralizer inlet and discharge must be lower
than the condensate drain.
Do NOT allow exhaust flue gases to vent
●
through the neutralizer. Leakage can cause
injury or death from carbon monoxide.
The connection between the appliance
●
and the neutralizer must be installed to
prevent the backflow of condensate into the
appliance.
Do not connect more than one appliance to
●
the neutralizer.
If option 'b' (p. 25) is selected as the disposal
option, the Navien condensate neutralizer kit is
recommended. The condensate from the appliance
flows through the neutralizing media and increases
the pH of the condensate. An increased pH prevents
corrosion of the installation's drainage system and
the public sewer system.
Installation
The inlet has a center connection port and the
●
outlet has an offset connection.
Install the neutralizer on the wall or the floor and
●
secure it using the brackets supplied with the kit.
If the neutralizer is installed horizontally, rotate
●
the neutralizer to position the outlet at the
highest point (Figure 1).
If the neutralizer is mounted vertically, ensure that
●
the outlet is higher than the inlet (Figure 2).
Ensure that the condensate runs freely to the
●
drain.
Ensure all connections are made to prevent
●
the backflow of condensate. Use corrosion
resistant piping and secure all piping to prevent
movement.
Do not install condensate piping in
Note
areas where the temperature drops
below freezing point. Protect piping in
high pedestrian areas from damage and
vibration.
If local codes permit, install a Y-fitting as a bypass
●
drain for increased safety when the condensate
drain is blocked. Connect the Y-fitting as shown
in the installation diagram and ensure that the
condensate runs freely to the drain.
Ensure that the discharge connection is
●
accessible. Access to the discharge connection is
required for maintenance and pH testing.
If there is insufficient gradient for drainage, install
●
a drainage pump designed for boiler and water
heater condensate removal.
Optional overflow bypass
Figure 1. Horizontal installation
Y-Fitting
bypass
Installing the System Piping 27