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
2-way valv e
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
ON OFF
ON
1 2 3 4 5 6 7 8 9 10
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 ON
ON
1 2
The end of the 1/2" (NPT) plastic piping should drain into a laundry
tub or into a floor drain.
Note Do not submerge the end of the pipe in water
External drain
Cold Water Supply
OFF
3 4 5 6 7 8 9 10
Direct to the
external drain
c
To the drain via
To the laundry
a d
a neutralizer
tub
b
To the laundry tub via
a condensate pump