Installation Manual
Add-on Board Installation Kit
For NPE-180A/210A/240A
This device is designed to work with
NPE-180A/210A/240A models ONLY.
WARNING
All Installations should be done only by a qualified expert and in accordance
with the appropriate Navien manual. Installing an electric appliance with
improper methods or materials may result in serious injury or death due to fire.
ELECTRICAL SHOCK HAZARD. Disconnect power before installing or servicing.
Otherwise, electrical shock may result causing severe personal injury, death, or
substantial property damage.
All wiring must be installed in accordance with local regulations of the
installation site.
NPE-ODC
1.2 Specifications
Refer to the following table for product specifications.
Items
Specifications
Model name
Device type
Add-on input board for Navien NPE-180A/210A/240A
water heaters for HotButton Recirculation
Installation type
Snap-on
(onto the NPE-180A/210A/240A water heater PCB tray)
Connections
Main connector socket to water heater
Main control connector (13-pin cable)
Switch terminal*
Contacts for multiple push button switches
* Push button switches do not require a power source. Multiple switches may be
* SIGNAL1 contacts are for optional wireless push buttons or motion sensor accessories.
** SENSOR I contacts are connected with a piece of metal plate by default. Remove
the metal plate before connecting a temperature sensor to the circuit board.
installed in parallel to activate DHW recirculation from various locations.
1.3 Device Layout
Refer to the following diagram for the product layout.
1.3.1 Wiring Connection Table
Terminal Wiring
Connection
Signal1
12 V
Signal
GND
Signal2
(Not polarity sensitive)
Push Button Switch Contact #1
Push Button Switch Contact #2
Sensor I
2. Installing the Device
This section provides information required to install the HotButton Kit
in an NPE-180A/210A/240A water heater.
WARNING
Ensure that you have turned off the power to the water heater before installing the device.
2.1 Basic Principles
The following diagram shows the basic operation of an NPE-180A/210A/240A water heater recirculation system with the HotButton Kit.
2.2 Installing the Device in an NPE-180A/210A/240A
Water Heater
Follow the instructions to install the HotButton
Kit in an NPE-180A/210A/240A
water heater.
1. Turn off the power supply to the water heater.
2. Remove the water heater’s front cover by loosening the four screws securing it
to the case.
4. Remove the two screws holding the PCB tray in place and pull out the PCB tray
from the unit.
3. Make sure that the 2-way valve is turned to the EXTERNAL setting, once the
plumbing system is completely installed.
.
4. Verify the current PCB version of the NPE water heater.
y
For OLD PCB Version KDC-330-5M P12
: The PCB must be replaced with an
updated version. Remove all the cables and connectors from the PCB and
replace with the latest PCB version that is compatible with the HotButton
Kit. Reconnect all the cables and connectors to the PCB. Proceed to the next
step.
y
For NEW PCB Version KDC-330-5M P20
: The existing PCB can be used. Pull
out the PCB from the tray, but do NOT disconnect any cables or wires.
Proceed directly to the next step.
5. Install the HotButton Kit onto the NPE-180A/210A/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 HotButton
Kit
with
the two catch
bars at
the back of the water heater’s PCB tray. Then pivot the HotButton Kit
onto the PCB tray until the latches snap -on to the catch bars.
7. Connect cables to the HotButton
Kit.
For more details, refer to “
3. Wiring The Device.
”
When Installing this Product:
1. Read these instructions carefully. Failure to comply could damage the
product or cause a hazardous condition.
2. Check the ratings provided in the instructions and on the product to make sure the
product is suitable for the application.
3. Installers must be trained, experienced, and licensed service technicians.
4. Follow local codes for installation and application requirements.
After the installation is complete, verify proper operation of this product by following the
instructions provided in this manual.
All wiring must be installed in accordance with local codes and regulations.
This accessory will not operate in conjunction with the Navien H2Air system.
Note
1. About the HotButton Kit
The Navien HotButton
Kit
is
an
add- on
input
board
for the Navien NPE -180A/210A/240A
water heaters. It adds signal input functions to the NPE-180A/210A/240A water heaters
for
more efficient DHW hot water recirculation
functionality.
With the HotButton Kit, DHW recirculation is carried out exactly when the actual
demands arise.
This prevents energy loss caused by unnecessary operation of the burner
and pump throughout the day.
The
HotButton Kit
receives signals from multiple push buttons installed in various
areas and performs optimal DHW recirculation only when there is a demand for
1.1 Included Items
The product is supplied with the following items.
. Make
sure
that
the
installation
kit
contains all the items before installing the product.
Main Connector - 13-pin to
Navien NPE 180A/210A/240A
Water Heaters
Installation Manual
Navien HotButton Kit
Wall Plate
(#GXXX001427)
Temperature Sensor
(#GXXX001640)
Push Button Switch
(#GXXX001426)
hot water.
Contacts for wireless push button or motion sensor
connection
Contacts for temperature sensor connection
5 V
Note
This device is not compatible with
cascade (multi-unit) installations.
Note
* When the optional temperature sensor is installed, it must be insulated.
The sensor wire may be extended by up to 100 ft (30m) using 22AWG wire.
Add-On Controller
