Navien NPE-32AWE, Installation Manual

Page: 21 / 68

2 1 Insta ll ing the Water Heater
3 . 4 Connecting the W ater S u pp ly
When connecting the water supply, follow these guidelines:
Do not remove the factory installed recirculation inlet cap
unless a return line is connected to this fitting. Water leakage
will occur if this cap is loose or missing ("A" model only).
Use only pipes, fittings, valves, and other components, such as
solder, that are approved for use in potable water systems.
Tighten the water heater connection valves with care to avoid
damage.
We recommend using unions and manual shut-off valves on
the cold water inlet, DHW outlet, and recirculation water inlet.
S trive to make the hot water piping system as short as
possible, to deliver hot water to the fixtures more quickly.
To conserve water and energy, insulate all water piping—
especially the hot and recirculation water lines. Never cover
the drain or pressure relief valve. If the water heater is installed
in a closed water supply system, such as one having a
backflow preventer in the cold water supply line, means shall
be provided to control thermal expansion. Contact the water
supplier or local plumbing inspector for information about
how to control this situation.
After installing the water heater, clean the inlet water filter
that is located inside the cold water inlet, and then test the
water heater for proper flow and inspect for leaks. Instruct
the water heater owner that the filter must be cleaned
periodically to maintain proper water flow.
WARNING
Tighten the water heater water connections, taking care
not to damage them. Do not force the tube connections
excessively, as this could damage the connections and
cause leaks.
Any dirt in the tubes could reduce water heater efficiency
and cause it to malfunction.
Any pipes exposed to the elements or which could free z e
in winter must be insulated with suitable insulating
material.
CAUTION
Failure to follow the instructions provided in this section
will void the warranty and may result in property damage,
fire or serious injury.
The following is a typical water piping example for NPE-
24AWE/32AWE models.
Pressure
R elief Valve
Union
Full port
Gas Valve
Gas S upply
Expansion
Tank
Hot Water S upply
R ecirculation Line
S hutoff Valve
Condensate Drain
Cold Water
S upply
[NPE-24AWE/32AWE]
The following is a typical water piping example for NPE-
24
S WE/32 S WE models.
Pressure
R elief Valve
S hutoff Valve
Hot Water
S upply
Union
Full port
Gas Valve
Gas S upply
Cold Water
S upply
Condensate Drain
[NPE-24SWE/32SWE]