Navien NPE-180A Quick Installation Manual page 2

Gas Inlet Adapter
Bottom View
Gas Supply Line
Gas meter's capacity ≥ Total gas capacity of connected appliances
Union
Full port
Gas Supply
Condensate Drain
Cold Water Supply
condensate trap.
The water heater is recommended
to be the first appliance to be connected
to the gas supply line.
Pressure
Relief
Valve
Valve
Hot Water Supply
• 1/2" rigid pipe can be used; refer to the sizing
tables in the Installation Manual for limitations.
Avoid using 1/2" corrugated connectors or tubing
as noise may occur.
Union
Pressure
Full port
Relief
Valve
Valve
Gas Supply
Hot Water Supply
Condensate Drain
Expansion Tank
2-way valve
The end of the 1/2" (NPT) plastic piping should drain into a laundry
tub or into a floor drain.
Do not submerge the end of the pipe in water
Note
Cold Water Supply
ON OFF
ON
1 2 3 4 5 6 7 8 9 10
Direct to the
external drain
c
To the drain via
To the laundry
a
a neutralizer d
tub
b
To the laundry tub via
a condensate pump
External drain