H2Air+
+
161
10.3 Wiring the Device
This section provides information required to plan and install the
system wiring.
10.3.1 System Wiring Examples
Refer to the following wiring diagrams to properly install wiring for
various setups you may need in your system. Set DIP switch (SW)
#3 as specified for each configuration.
1-Stage Thermostat / 2-Stage Control System
Set DIP switch (SW) #3 to ‘Off’ to configure the system to use a
1-stage thermostat/ 2-stage control.
1-Stage Thermostat / 1-Stage Control System
Set DIP switch (SW) #3 to ‘Off’ to configure the system to use a
1-stage thermostat / 1-stage control.
5. Install the H2Air+
+
onto the NPE-180A/240A water heater’s PCB
tray. Align the latch at the back of the case with the front lip of
the PCB tray.
6. Align the two latches at the back of the H2Air+
+
with the two
catch bars at the back of the water heater’s PCB tray. Then
pivot the H2Air+
+
onto the PCB tray until the latches snap-on
to the catch bars.
7. Connect cables to the H2Air+
+
. For more details, refer to “10.5.2
Entering the R&D Information Menu”, on page 165.
8. Set the proper DIP switches for the desired installation setup.
For more details, refer to “Dip Switch Function Table”, on page
159.
9. Replace the PCB tray back into the water heater and secure it
with the two screws.
10. Close the front cover and secure it with the 4 screws.
CAUTION
Before disconnecting cables inside the unit, label all cables.
Wiring errors can cause improper operation and dangerous
situations. Verify wiring connections and unit operation after
servicing.
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