29Installing the Water Heater
Note
●
For more information about the
Recirculation settings, refer to
"Included Items" on page 79.
●
If the A2-type model requires
an external pump, follow the
instructions in "3.4.3 External Pump
Wire Connection" on page 30
first and select YES on the screen
asking whether the external pump is
connected to the PCB.
Model Step 1 Step 2 Step 3
A2-
type
Ext.
Recirc
Use Ext.
Pump
Yes/No
Always On
Intelligent
Weekly
HotButton
S2-
type
Ext.
Recirc
Always On N/A
Intelligent N/A
Weekly
Schedule
Set
HotButton N/A
The following diagram shows the external
recirculation flow for pre-heating:
[External Recirculation Mode using the Recirculation Inlet]
Primary Heat Exchanger
Secondary Heat Exchanger
Buffer
Tank
Flow
Sensor
Domestic
Water
Supply
Hot
Water
Supply
Recirculation
Water Supply
Check Valve
Water
Adjustment
Valve
2-Way
Valve
Closed
Circulation Pump
External Recirculation Mode
To use the external recirculation mode:
1. Connect the water supply to support
recirculation. Refer to the "[NPE-180A2/ 210A2/
240A2]" diagram on page 26.
2. Set the 2-way valve inside the water heater to
“EXT.“
3. Press the Menu button ( ) to access the Main
menu and select 1. Recirculation Setting >
2. External Recirculation by pressing the OK
button (
).
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