Navien NPE-180A2 Installation Manual page 42

3.6.1 Venting the Water Heater
DANGER
This appliance is certified as a Category IV
appliance and requires a special venting system.
The vent system operates with a positive
pressure in the pipe.
To prevent serious injury or death:
ALWAYS vent exhaust gases directly outdoors
●
using the vent materials and following these
instructions.
DO NOT connect vent connectors serving
●
appliances vented by natural draft into
any portion of mechanical draft systems
operating under positive pressure.
WARNING
Improper venting of the water heater can result
in excessive levels of carbon monoxide and can
lead to serious 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.
To prevent serious injury or death:
ONLY licensed professionals should install
●
venting.
ALWAYS follow all regulations, codes, and
●
instructions when venting the water heater.
ALWAYS seal the venting system gastight
●
to prevent flue gas leakage and carbon
monoxide emissions.
The building owner is responsible to maintain
●
the exhaust and intake terminations free of
snow, ice, or other potential blockages, as
well as scheduling routine maintenance.
42 Installing the Water Heater
The water heater must be properly vented to ensure
a constant supply of clean intake air and to ensure
that exhaust air is properly removed from living
areas. When venting the water heater, follow these
guidelines:
For best results, keep the venting system as short
●
and straight as possible.
Locate the water heater as close as possible to the
●
vent termination.
Do not connect the water heater vent to a vent
●
for any other gas water heater or vent stack.
For horizontal runs, slope the horizontal section
●
upward toward the vent termination at a rate of
/ in. per foot (2% slope).
1
4
Create an airtight seal at each joint in the exhaust
●
and intake air pipes from the water heater collar
to the vent termination.
Do not cover any non-metallic vent
Note
materials with thermal insulation.