Navien H2Air Add-On Controller Kit (Optional) - Navien NPE Installation & Operation Manual

7.7 Navien H2Air Add-on Controller Kit (Optional)

The Navien H2Air is an add-on controller for the Navien NPE-A series water heaters. It adds input and output
functions to the NPE-A series water heaters for a combination application where space heating and domestic hot
water (DHW) are supplied simultaneously. With this add-on controller, a thermostat (1 or 2-stage) and an outdoor
sensor can be installed along with a hydronic air handler to add space heating functionality to the system.
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 H2Air add-on controller.
CAUTION
Do not configure the system for DHW recirculation when it is configured to run an air handler using the H2Air add-on controller. DHW
recirculation and Navien H2Air configurations cannot be used at the same time.
Thermostat
For details, refer to the installation manual that is provided with the H2Air add-on controller kit.
Outdoor Sensor
Heat Demand
Output
Space Heating
Supply
Space Heating
Return
NPE-A Series
Water Heater
Expansion
Tank
Check
Valve
Flow Switch
Mixing Valve
DHW Supply
Cold Water
Supply
Appendixes 97