Navien NPE-180A Installation Manual page 24

3. Remove the 2 screws holding the PCB box in place and remove
the PCB box from the system.
Remove Screws here.
4. Connect the external pump wiring connector to the connector
socket on the PCB (TB1).
5. Put the PCB box back in its original place and secure it using
the 2 mounting screws.
6. Remove the plastic insulation from the external pump wire
with a wire stripper before connecting it to the pump.
7. Connect the External Pump Wire to the proper wires from the
pump junction box.
WARNING
To avoid the danger of electric shock, turn on the water heater
ONLY after connecting the wire to the external pump.
24 Installing the Water Heater
TB1
8. Locate the 10-switch DIP (SW1) on the front panel and turn on
the proper switches based on the desired recirculation setting
(see Recirculation Dipswitch Settings below).
9. Turn on the switch beside the front panel.
10. Put the water heater cover back on and secure it with the
4 screws.
G H
Domestic
Hot Water
Domestic
Recirculation
Return
Recirculation Using External Pump Only
ON ON
1 2 3 4 5 6 7 8 9 10 1
C
Condensate
Gas
Domestic
Cold Water
2