Navien On-Demand Control Kit (Optional) - Navien NPE-180A Installation Manual

5.8 Navien On-Demand Control Kit (Optional)

CAUTION
This device is designed to work with the NPE-A series models ONLY.
Basic Principles
The following diagram shows the basic operation of an NPE-A series water heater system with the Navien On-Demand control kit.
CAUTION
The Navien On-Demand control kit can be used ONLY with a water heater system configured for DHW recirculation.
City water supply
For details, refer to the installation manual that is provided with the On-Demand control kit.
68 Appendixes
Navien On Demand Control Kit is an add-on input board for the Navien NPE-A series water heaters. It adds
signal input functions to the NPE-A series water heaters for more efficient DHW hot water recirculation
functionality.
With the On Demand Control Kit, DHW recirculation is carried out exactly when the actual demands arise.
This prevents energy loss caused by unnecessary operation of the burner a nd pump throughout th e day.
The On Demand Control 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.
To cold water inlet
DHW return
(to recirculation inlet)
DHW supply
(to hot water fixtures)
Cold water line
Push button Push button
contact signal contact signal
Push button
contact signal