H2Air+
+
163
Connecting the Main Control Connector
To connect the H2Air+
+
to the Navien NPE-180A/240A water
heater, use the 13-pin main control connector supplied with the
Navien H2Air+
+
. Connect one end of the cable to the connector
socket on the H2Air+
+
PCB. Then, connect the other end to the
connector socket on the NPE-180A/240A water heater PCB.
10.4 Configuring the Device
This section provides the information required to set the desired
options for the NPE-180A/240A water heater system with the
H2Air+
+
add-on controller.
10.4.1 Pump Control Options
CAUTION
The drawings in this instruction are intended only as a guide
and are not replacements for professional engineering
drawings. This drawing represents a concept system and
does not imply compliance with local building codes. Actual
installation requirements may vary depending on installation
locations and parameters. All installation work must be carried
out in accordance with all local building codes. Verify with local
building officials before commencing system installation.
The following example demonstrates the application of pump
control configuration options.
A System with the Internal Circulation Pump
Set the 2-way valve inside the water heater to ‘EXT’. For more
information about settings, refer to “Selecting a Recirculation
Mode (“A” model only)” in the Water Heater Installation Manual.
WARNING
An anti-scalding device must be installed in the system in order
to limit the DHW output temperature and prevent scalding.
Setting the valve to 115-120°F is recommended.
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