Navien NFB-175 Mode D'emploi page 25

Before connecting the condensate drain, choose one of the
following disposal options:
a
b
a. From the boiler directly into an external drain.
Do not install a fixed connection for the drain.
Note
b. From the boiler, through a neutralizing agent, and then
into an external drain (refer to "3.2.1 Condensate Neutralizer
Kit" on page 25).
If you choose this option, the neutralizing agent
Note
must be replaced periodically. Depletion of the
neutralizing agent will vary, based on the usage
rate of the boiler. During the first year of operation,
the neutralizer should be checked every few
months for depletion and replaced as needed.
c. From the boiler into a laundry tub.
The bottom of the boiler must be higher than
Note
the top of the laundry tub to use this option. The
condensate line must have a negative slope to
drain properly.
d. From the boiler into a condensate pump, and then into a
laundry tub.
A pump can be used when there is a long distance
Note
between the boiler and the laundry tub or when
the bottom of the boiler is lower than the top of the
laundry tub.
c
d
To connect the condensate drain:
1. Connect a drain line to the
boiler.
Use only corrosion-resistant material for the drain line, such as
PVC or CPVC. Do not reduce the size of this fitting or the drain
line to less than / in.
1
2
2. Place the free end of the drain line into an appropriate drain.
3. If you are using a condensate pump, ensure that the pump
allows for up to 3 GPH of drainage for each boiler in the
system.
4. If you are not using a condensate pump, ensure that the drain
line is pitched downward at a minimum slope of
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. 24) 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.
/ in fitting at the bottom of the
1
2
NPT 1/2"
/ in per foot.
1
4
Installing the System Piping 25