Venting The Water Heater - Navien NPE Installation & Operation Manual

For increased safety when the condensate drain blocks, install
a Y-fitting. 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 water heater and boiler condensate removal.
Figure 1. Horizontal installation
overflow bypass
Figure 2. Vertical installation
32 Installing the Water Heater
Optional
overflow bypass
Optional
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.

3.6 Venting the Water Heater

DANGER
This appliance is certified as a "Category IV" appliance and
requires a special venting system. The vent system will operate
with a positive pressure in the pipe. Exhaust gases must be
piped directly outdoors using the vent materials and rules
outlined in these instructions. Do not connect vent connectors
serving appliances vented by natural draft into any portion of
mechanical draft systems operating under positive pressure.
Follow the venting instructions carefully. Failure to do so will
result in substantial property damage, severe personal injury,
or death.
WARNING
Improper venting of the water heater can result in excessive
levels of carbon monoxide, which can lead to severe
personal injury or death. This water heater must be vented
in accordance with the "Venting of Equipment" section
of the latest edition of the ANSI Z223.1/NFPA 54 Natural
Fuel Gas Code in the USA and/or the "Venting systems
and air supply for water heaters" section of the latest
version of the CAN/CGA B149.1 Natural Gas and Propane
Installation Code in Canada, as well as all applicable local
building codes and regulations. Follow all instructions and
guidelines when venting the water heater. Venting should
be performed only by a licensed professional.
The venting system must be sealed gastight to prevent flue
gas spillage and carbon monoxide emissions, which will
result in severe personal injury or death.
The building owner is responsible for keeping the exhaust
and intake terminations free of snow, ice, or other potential
blockages, as well as scheduling routing maintenance.
Blocked or obstructed vent piping terminations could result
in property damage, severe personal injury, or death.