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2.3 NPN System
For more information about external recirculation mode and DIP
switch settings, refer to the NPN Installation Manual.
2.3.1 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 ow 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 o or disconnected.
●
ALWAYS check the water heater is turned o before
connecting the wire to the PCB.
Note
Congure the desired mode according to the
instructions in the NPN Installation Manual.
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