Navien NPN Installation & Operation Manual page 29

9. Turn on the switch beside the front panel.
10. Put the water heater cover back on and secure it
with the 4 screws.
Domestic
Hot Water
Domestic
Recirculation
Return
Recirculation Using External Pump Only
28 Installing the Water Heater
Gas
Domestic Cold Water
3.4.3 Adjusting the Recirculation
Parameters
Entering the R&D Information Menu
Follow the instructions below to enter the R&D
information menu.
1. On the Front panel, press the Power button to
turn off the water heater.
2. Enter the R&D information menu by pressing
the Up (+) button three times, the Down (-)
button three times, and then the Up (+) button
four more times.
3. In the R&D information menu, use the Up (+) or
Down (-) buttons to move to 2.PAR (Parameter
information mode), and then press the Info
button.
No. Mode
1 Technical Information
2 Parameter Information
4. To return to the previous menu (R&D
information menu), press the [Reset] button
once.
Items Name Description
Set the
maximum
Pump Cycle time for pump
12. P12
Interval operation or
on-demand
operation.
Pump Set the pump
14. P14 Sampling cycle ON
Time interval.
Set the offset
temperature
to turn off the
preheating
Differential
15. P15
OFF Temp operation
(function
disabled with
HotButton Kit).
Display
Display