Basic Principles; Navien H2Air Add-On Controller Kit (Optional) - Navien NPE-180A2 Installation Manual

Connecting the Power Supply
Is the system properly set up for cascade operation (master and slave water heaters), if
applicable?
Setting with the Front Panel
Have you verified the desired settings using the front panel?
Have you verified the parameters using the front panel?
Operating the Water Heater
Have you shown the owner how to clean the inlet water filter?
Have you given the Installation Manual and Owner's Manual to the owner for future
reference?
Have you shown the owner how to shut off the gas in case of an emergency?

7.7 Navien H2Air Add-on Controller Kit (Optional)

CAUTION
This device is designed to work with the NPE-A2/S2 models ONLY.

Basic Principles

The following diagram shows the basic operation of NPE-A2/S2 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.
126 Appendixes
The Navien H2Air is an add-on controller for the Navien NPE-A2/S2 water heaters. It
adds input and output functions to the NPE-A2/S2 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.
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