2
Gas Piping Connections
>
Gas meter’s capacity ≥
Total gas capacity of
connected appliances
The water heater is
recommended to be
the first appliance to
be connected to the
gas supply line.
Gas Supply Line
Gas regulator
Gas Inlet Adapter
Bottom View
Example:
Gas meter
425 CFH
≥
Water heater
195 CFH
+
Furnace
58.8 CFH
+
Domestic gas stove
63.7CFH
* 1 CFH=1,020 Btuh
1
/
2
" rigid pipe can be used; refer to the sizing tables in the Installation & Operation
Manual for limitations. Avoid using
1
/
2
" corrugated connectors or tubing as noise may
occur.
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 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.
NPT
1
/
2
in
Internal Recirculation
Pressure
Relief Valve
Shutoff
Valve
Hot Water Supply
Union
Full port
Gas Valve
Gas Supply
Cold Water
Supply
Condensate Drain
External Recirculation using the Cold Water Inlet
Pressure
Relief Valve
Union
Full port
Gas Valve
Gas Supply
Expansion Tank
Hot Water Supply
Recirculation Line
Shutoff Valve
Condensate Drain
Cold Water Supply
Check Valve
External Recirculation using the Recirculation Inlet
Pressure
Relief Valve
Union
Full port
Gas Valve
Gas Supply
Expansion Tank
Hot Water Supply
Recirculation Line
Shutoff Valve
Condensate Drain
Cold Water Supply
Check Valve
Internal Recirculation Settings
External Recirculation Settings
Press the Menu button ( ) to access
the Main menu, and select
1.
Recirculation Setting
>
3. Internal
Recirculation
by pressing the OK
button (
).
Model Step 1 Step 2
Step 3
A-type
Int.
Recirc
Always On
N/A
Intelligent
N/A
Weekly
Schedule
Set
Press the Menu button ( ) to access
the Main menu, and select
1.
Recirculation Setting
>
2. External
Recirculation
by pressing the OK
button (
).
Model Step 1 Step 2
Step 3
A-type
Ext.
Recirc
Use Ext.
Pump
Yes/No
Always On
Intelligent
Weekly
On-demand
Water Piping Connections (NPE-180A2/210A2/240A2)
>
To the laundry tub
Direct to the
external drain
External drain
To the laundry tub via a
condensate pump
To the
drain via a
neutralizer
Condensate
Trap
Water
