22 Installing the System Piping
3.2 Connecting the Condensate Drain
The Navien NHB 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 laundry tub,
as the alkali in laundry detergent will neutralize the acid in the
condensate. However, other suitable waste drain locations may be
used according to the local codes.
CAUTION
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.
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.
b. From the boiler, through a neutralizing agent, and
then into an external drain (refer to "3.2.1 Condensate
Neutralizer Kit" on page 23).
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 /”
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 2 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
1
/
4
in per foot.
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