23
Installing the System Piping
b. From the boiler, through a neutralizing agent,
and then into an external drain (refer to “3.2.1
Condensate Neutralizer Kit” on page 24).
Note
If you choose this option, the
neutralizing agent 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.
Note
The bottom of the boiler must
be higher than 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.
Note
A pump can be used when there is
a long distance between the boiler
and the laundry tub or when the
bottom of the boiler is lower than
the top of the laundry tub.
To connect the condensate drain:
1. Connect a drain line to the
1
/
2
in fitting at the
bottom of 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
1
/
2
in.
NPT 1/2”
3.2 Connecting the Condensate
Drain
The Navien NHB-H boiler creates condensation
when it operates. This condensation has an acidic
pH of 3-5. Follow all local codes and regulations
when disposing of condensate from the boiler. We
recommend draining the condensate into a suitable
external drain. However, other suitable waste drain
locations may be used according to the local codes.
WARNING
●
Fill the condensate trap with water after
installing the condensate drain pipe.
●
Do not cap or plug the integrated condensate
line. If prevented from draining, condensate
can damage the boiler.
●
The condensate line must have a negative
slope to drain properly.
●
NEVER drink or allow animals to drink
condensate. The pH of the condensate could
cause serious injury.
Before connecting the condensate drain, choose
one of the following disposal options:
a
b
c
d
a. From the boiler directly into an external
drain.
Note
Do not install a fixed connection for
the drain.
