Navien NPE-180A2 Installation Manual page 28

Internal Recirculation Mode ("A2" Model
Only)
To use the internal recirculation mode:
1. Connect the water supply.
2. Set the 2-way valve inside the water heater to
"INT. "
3. Press the Menu button (
menu and select 1. Recirculation Setting >
3. Internal Recirculation by pressing the OK
button ( ).
28 Installing the Water Heater
) to access the Main
For more information about the
Note
●
Recirculation settings, refer to
"Included Items" on page 79.
Internal Recirculation is available
●
only on A2-type models.
Model Step 1 Step 2
A2-
type
NOTICE
Do not remove the cap on the recirculation inlet
fitting if the Internal Recirculation Mode is used.
The following diagram shows the internal
recirculation flow for pre-heating:
Primary Heat Exchanger
Buffer
Secondary Heat Exchanger
Tank
2-Way
Check Valve
Valve
Open
Hot Water
Supply
[Internal Recirculation Mode]
Step 3
Always On N/A
Int.
Intelligent N/A
Recirc
Schedule
Weekly
Set
Flow
Sensor
Circulation
Pump
Water
Adjustment
Valve
Domestic Water
Supply