Navien Hotbutton Kit (Optional) - Navien NPN Installation & Operation Manual

6.8 Navien HotButton Kit (Optional)

6.8.1 Basic Principles
The following diagram shows the basic operation of the water heater system with the Navien HotButton kit.
CAUTION
The Navien HotButton can be used ONLY with a water heater system configured for DHW recirculation.
To cold water inlet
City water supply
The Navien HotButton kit is an add-on input board for the water heater. It adds
signal input functions to the water heater 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.
Push button
contact signal
DHW return
(to recirculation inlet)
DHW supply
(to hot water xtures)
Cold water line
Push button
contact signal
* When the optional temperature sensor is installed, it must be insulated.
The sensor wire may be extended by up to 100 ft (30 m) using 22AWG wire.
Push button
contact signal
Temperature
sensor (optional)
Appendixes 73