31Installing the Water Heater
C
HG
Condensate
Gas
Domestic Cold Water
Domestic Hot Water
Domestic Recirculation Return
[Type 2. Recirculation Using a Second Pump
(NPE-A2 Models, Navien Internal Pump &
External Pump)]
3.4.4 Navien HotButton Kit
The NPE-A2/S2 series water
heaters have a built-in Navien
HotButton controller (the
push button, wall plate, and
temperature sensor have to be
purchased separately). It adds
signal input functions to the
NPE-A2/S2 series water heaters
for more efficient DHW hot water
recirculation functionality.
With the HotButton kit, DHW recirculation is carried
out exactly when the actual demands arise. This
prevents energy loss caused by unnecessary operation
of the burner and pump throughout the day.
The HotButton kit can receive signals from multiple
push buttons installed in various areas and performs
optimal DHW recirculation only when there is a
demand for hot water. For more information about
the parameter settings, refer to “Included Items” on
page 79, “6.8 Maintenance” on page 87, and
“7.5.1.3 Setting the Application” on page 100.
7. Connect the external pump wire to the proper
wires from the pump junction box.
WARNING
ONLY turn on the water heater after connecting
the wire to the external pump to prevent serious
injury or death from electric shock.
8. Turn on the switch beside the front panel.
9. Put the water heater cover back on and secure it
with the 4screws.
You can configure it as either Type 1 or Type 2 if
you install an external recirculation line.
C
HG
Condensate
Gas
Domestic Cold Water
Domestic Hot Water
Domestic Recirculation Return
[Type 1. Recirculation using External Pump -
Return line ties into Cold Water Inlet
(NPE-S2 Models)]
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