How can I set up the hot water recirculation mode for this model?
To configure hot water recirculation, first connect the return line and remove any caps on existing fittings. Then, for internal recirculation mode, adjust the front panel DIP switches as outlined in the manual’s table (page 21). For external recirculation, modify settings according to page 20 instructions.
From the official Navien Npe 240a2 manual, page 20
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