Venting; Warning; Venting Guidelines - Navien NR-180 Installation Manual

Navien Gas Water Heater Installation

█ Venting:

Improper venting of the Water Heater can result in excessive levels of carbon
monoxide which can result in 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 and/or the "Venting
systems and air supply for appliances" section of the latest version of the CAN/CGA
B149.1 Natural Gas and Propane Installation Code in Canada and in accordance
with all applicable local building codes.
This Navien Water Heater can be vented with PVC or CPVC. PVC Vent can be
used in all cases up to Exhaust flue Temperature 149°F (65°C). Plastic vent can
be used in all cases EXCEPT when the incoming or recirculation return water
temperatures exceed 160°F (70°C). IF you set the Water Heater at a temperature
higher than 160°F (70°C) AND are running an external recirculation loop or a
combination heating system, you MUST use Plastic venting(CPVC Sch80) or any 3"
venting system approved for use with Category IV appliances (typically Type BH
Special Gas Vent approved to UL1738-S636).

Venting Guidelines

 For best results, keep the vent system as short and straight as possible.
 Locate the Water Heater as close as possible to the vent terminator.
 The water heater vent must not be common vented with any other gas appliance or
vent stack.
 Slope the vent upwards toward the vent terminal at a rate of ¼" per foot (2% slope).
 The exhaust pipe and intake air pipe must be sealed air tight at each joint from
exhaust pipe to terminator.
 Make sure that the seam of the vent pipe in horizontal runs is toward the top of the
installation.
 Do not downsize the vent system as this will affect the operation of the unit.
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