Plumbing; Plumbing And Water Connection Guidelines - Navien NR-180 Installation Manual

Navien Gas Water Heater Installation

█ Plumbing:

Pipe Sizing
 The water fittings on the Navien Water Heater are ¾".
 Although Navien's water connections are ¾", if the installation site has only ½" plumbing
throughout the building, it is NOT necessary to upsize the water lines to ¾" when installing a
single unit.
 When installing multiple units to supply high volumes of hot water either in residential (multi-
head shower systems for example) applications or in commercial applications, the number of
Navien Water Heaters required and the header pipe sizing needs to be properly sized to meet
the total hot water demand. A water pressure of 40 PSI is recommended for each Water Heater
for proper operation of the Water Heaters. Consult the Navien website or call for further
information on sizing such applications.
Water Piping Guidelines
 All pipes, pipe fittings, valves and other components, including solder, must be approved
for use in potable water systems.
 The use of unions and manual shut off valves on both the cold water inlet and DHW outlet
are recommended.
 The longer the piping, the longer it takes to get hot water to the fixtures. Make the hot
water piping system as short as possible.
 To conserve water and energy, insulate all water piping especially the hot and recirculation
water lines. DO NOT cover the drain or pressure relief valve.
 After the Water Heater has been installed, be sure to clean the inlet water filter located
within the cold inlet and then test the unit. The inlet water filter is there to prevent debris
from entering your heater. This will need to be cleaned periodically to maintain optimum
flow; See "draining the unit" and "cleaning the inlet water filter" procedures in the
maintenance section of the operation manual for instructions on these two procedures.
Space Heating
 Piping and components connected to the Water Heater for the space heating application
shall be suitable for use with potable water.
 The effect that toxic chemicals, such as used for boiler treatment, shall not be introduced
into the potable water used for space heating.
 The effect that a water heater which will be used to supply potable wter shall not be
connected to any heating system or component(s) previously used with a nonpotable
water heating appliance.
 Instructions that when the system requires water for space heating at temperatures higher
than required for other uses, a means such as a mixing valve shall be installed to temper
the water for those uses in order to reduce scald hazard potential. These instructions shall
include a piping diagram(s) for a typical installation.
CAUTION
This Water Heater must only be used with the following water supply system conditions :

With clean, potable water free of corrosive chemicals, sand, dirt, of other contamintes.

With inlet water temperature above 32℉ (0℃), but not exceeding 140℉ (60℃).

Free of lime and scale deposits.
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