Navien NPE-180A Quick Installation Manual page 2

Gas Piping Connections
Gas Inlet Adapter
Bottom View
Gas
regulator
Gas Supply Line
Gas meter's capacity ≥ Total gas capacity of connected appliances
Gas supply
Water Piping Connections (NPE-180A/210A/240A)
Internal Recirculation
Union
Full port
Gas Supply
Condensate Drain
Cold Water Supply
Internal Recirculation Settings
2-way valve
Condensate Drain Connection
A condensate drain pipe must be connected to the 1/2" condensate outlet fitting at
the bottom of the unit and water must be poured into the exhaust connection to fill
the condensate trap.
The water heater is recommended to be
the first appliance to be connected to the
gas supply line.
Pressure
Relief Valve
Shutoff Valve
Hot Water Supply
ON OFF
Syphon
Water
Condensate
Outlet
Floor drain
Example:
Gas meter Water heater
≥
425 CFH 195 CFH
* 1 CFH=1,020 Btuh
• 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.
External Recirculation
Union
Full port
Gas Supply
Hot Water supply
Expansion Tank
External Recirculation Settings
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
Note
pipe in water.
2
+ Furnace + Domestic gas stove
58.8 CFH 63.7 CFH
Pressure
Relief Valve
Shutoff Valve
Condensate Drain
Cold Water Supply
ON OFF
Direct to the
external drain
To the drain via
a neutralizer
To the laundry tub
via a condensate pump
External drain
To the laundry
tub