Navien NPE-180A2 Installation Manual page 30

3.4.3 External Pump Wire Connection
An external pump may be connected to the water
heater for recirculation applications. When selecting
a circulator, it shall be sized to maintain a flow of
2-4 GPM through the water heater. Follow the
instructions below when connecting the pump wire
accessory to the PCB.
WARNING
Electric shock hazard
To prevent death or serious injury or property
damage:
DO NOT remove the front cover unless the
●
power to the water heater is turned off or
disconnected.
ALWAYS check the water heater is turned off
●
before connecting the wire to the PCB.
Configure the desired mode according
Note
to the instructions in this manual.
<Specifications>
External Pump Wire (#GXXX001319)
●
Maximum Power Consumption: 150 W, 1.5 A
●
Length: 6 ft (183 cm)
●
 When using a pump with larger power requirements
than the listed specification above, a relay should be
used to ensure proper operation.
1. Remove the water heater front cover by
loosening the 4 Phillips head screws securing it
to the case.
30 Installing the Water Heater
2. Locate the power switch on the right side of the
front panel and switch the system off.
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.
Turn the switch off. Turn the switch off.
TB1