Navien NPE-180A2 Installation Manual page 26

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.
The following is a typical water piping example
●
for NPE-180A2/210A2/240A2 models.
Union
Full port
Gas Valve
Gas Supply
Hot Water Supply
Recirculation Line
[NPE-180A2/ 210A2/ 240A2]
26 Installing the Water Heater
The following is a typical water piping example
●
for NPE-150S2/180S2/210S2/240S2 models.
Full port
Gas Valve
Gas Supply
Cold Water
Supply
Pressure Relief
Valve*
* required -
not included
Shutoff Valve
Condensate
Drain
Cold Water
Supply
Check Valve
Expansion
Tank
Union
Condensate Drain
[NPE-150S2/180S2/ 210S2/ 240S2]
Pressure Relief
Valve*
* required -
not included
Shutoff
Valve
Hot
Water
Supply