Stern Engineering NARA 2032 Product manual

1
INSTALLATION AND MAINTENANCE GUIDE
ELECTRONIC FLUSH VALVE FOR WC
WITH DUAL FLUSH INFRARED SENSOR
NARA 2032 / E / P / PE / K / KE

INDEX
INDEX
1 TECHNICAL DATA
2-3 PACK CONTENTS
4 NARA 2032 K / KE (PN: 800271 / 800276)
5 PRE-INSTALLATION INFO
INSTALLATION
6-7 NARA 2032 (PN: 160310)
8-9 NARA 2032 E (PN: 160410)
10-11 NARA 2032 P (PN: 160610)
12-13 NARA 2032 PE (PN: 160510)
14 BATTERY REPLACEMENT INSTRUCTIONS
15-17 SETTINGS ADJUSTMENT
18 MAINTENANCE AND LIMITED WARRANTY
19 SPARE PARTS LIST
20-21 TROUBLE-SHOOTING
OPERATION
Nara is a touch free electronic flush valve
for W.C. operated by a self adjusting infrared
sensor. Water will start flushing when the user
will walk away from the W.C.
If the user was present in front of the W.C. for
less than one minute, a reduced flush will take
place to remove liquid waste.
If the user was present in front of the W.C. for
one minute or more, a full flush will occur to
remove solid waste.
Nara includes a mechanical override push
button for alternative manual operation.
Nara P includes a piezo button for alternative touch operation.
Once the manual push button / piezo button has been used, the system will discharge
a full flush.

1
TECHNICAL DATA
Power specification: 9V low voltage system
Power Supply
Nara 2032and Nara 2032 P: 9V Battery
Nara 2032 E: 9 V Transformer
Nara 2032 PE: 9V Transformer with Battery Back Up Device
Operating water pressure: 1.0-8.0 bar (14.5 – 116.O PSI).
With water pressure of more than 8 Bars,
use a pressure reducing valve for reduction.
Sensor range: Self adjusting sensor range. Adjustable with
Stern’s remote control

2
PACK CONTENTS
NARA 2032 / 2032 E
1 x Plastic box
with concealed flush valve
Familiarize yourself with the part names and confirm that the parts are included:
1 x Plastic seat
for the cover plate
1 x Wall cover plate
with the electronic unit
Adjusting screw 1 x Allen key
4 x Screws
9V Battery box Transformer
B VERSIONS E VERSIONS
1 x Screw M4x10
1 x Temporary
protective panel

3
PACK CONTENTS
NARA 2032 P / 2032 PE
1 x Plastic box
with concealed flush valve
Familiarize yourself with the part names and confirm that the parts are included:
1 x Plastic seat
for the cover plate
1 x Wall cover plate
with the electronic unit
9V Battery box
B VERSIONS E VERSIONS
1 x Temporary
protective panel
Transformer and
back up device
1 x Screw M4x10
4 x Screws
1 x Allen key

4
NARA 2032 K / KE
WITH IRON FRAME
1 x Plastic box
with concealed flush valve
1 x Plastic seat
for the cover plate
1 x Wall cover plate
with the electronic unit
2
3
4
2
3
4
Note:
1. Keep a minimum distance of 500mm between the upper surface of
the bowl and the infra red sensor.
2. The maximum thickness of the plaster wall covering the frame
should be up to 50mm.
1 x Iron frame
and accessoires
1
1

5
PRE–INSTALLATION INFO
Check contents
Separate all parts from packaging and check each part with the pack
contents section.
Make sure all parts are accounted for before discarding any packaging
material. If any parts are missing, do not attempt to install the electronic
flush valve until you obtain the missing parts.
Warnings
Do not install the system facing a mirror or any
other electronic system operated by an infra-
red sensor.
To prevent reflection problems, it is recommended
to keep a minimum distance of 1.50 meters
between the flush valve and other objects.
Preparation for installation
Flush water supply lines thoroughly before
installing the flush valve. Do not allow dirt,
Teflon tape or metal particles to enter the flush
valve.
All plumbing is to be installed in accordance
with applicable codes and regulations.
Important: For the optimal performance of this flush valve, the entire
piping infrastructure from the main big water-supply pipe down to
the W.C. would have 1” diameter.

6
INSTALLATION NARA 2032
Step 1 – Installing the flush valve and connecting the water supply
1) Shut off the water supply.
2) Cut an adequate opening in the wall for the dimensions
of the box and the sleeve (not supplied).
3) Insert the electronic flush valve’s box through the
opening.
4) Connect the flush valve inlet to the water supply.
5) Connect the flush valve outlet nipple to the pipe
leading to the W.C.’s inlet.
6) Turn on the water supply. Make sure there is no water
leakage.
7) Assemble the temporary protective cover to protect the flush valve.
Step 2 – Connecting the power source
1) Once the electricity, plumbing and tiles works are
finished, replace the temporary protective cover
with the plastic seat. Adjust it using the four screws
provided.
2) a. Connect the electronic unit connector that leads
to the solenoid valve to the solenoid connector.
b. Connect the electronic unit connector that leads
to the power source to the battery box connector.
3) Before assembling the panel, consider using
the provided adjusting screw in order to optimize
the operation of the mechanical button. If needed,
assemble the adjusting screw to the mechanical button at the internal side
of the panel and adjust it to the desired distance.

7
NARA 2032
INSTALLATION
Pay atention, steps 4-7 must be completed within 30 seconds:
4) Insert the battery into the battery box.
5) Assemble the panel to the cover seat. Do not tighten the
bottom screw yet.
6) The ideal sensor range for the specific
location will be set automatically. Right
now, check that no objects are in front of
the sensor.
7) Remove the protective sticker covering the
sensor and move away from the sensor range.
8) Wait about 30 seconds before you step or put your hand within the sensor
range. As an indication that the self adjusting is taking place, a red light in the
sensor eye will flash continuously. The solenoid valve will be opened and closed
for 1 second as an indication that the ideal sensor range was set and the product is
ready for use.
9) To operate, step within the sensor range for a minimum of 8 seconds.
Move away and the flush valve will flush a few seconds after your departure.
10) If needed adjust the flow rate by turning the regulating valve. In order
to avoid entering into the self adjusting mode, do not
disconnect the cables between the electronic unit and
battery box.
11) If the range is unsatisfactory, refer to the section
entitled “Settings Adjustment”.
12) Tighten the panel to the cover seat with the bottom screw.
30
sec

8
INSTALLATION NARA 2032 E
Step 1 – Installing the flush valve and connecting the water supply
1) Shut off the water supply.
2) Cut an adequate opening in the wall for the dimensions
of the box and the sleeve (not supplied) where you will
accommodate the transformer cable.
3) Insert the electronic flush valve’s box through the
opening.
4) Connect the flush valve inlet to the water supply.
5) Connect the flush valve outlet nipple to the pipe
leading to the W.C.’s inlet.
6) Turn on the water supply. Make sure there is no water
leakage.
7) Assemble the temporary protective cover to protect the flush valve.
Step 2 – Connecting the power source
1) Place the transformer near the electricity plug, insert the transformer cable wire
through the box.
2) Once the electricity, plumbing and tiles works are
finished, replace the temporary protective cover
with the plastic seat. Adjust it using the four screws
provided.
3) Connect the electronic unit connector that leads to
the solenoid valve to the solenoid connector.
4) Connect the other electronic unit connector to the
transformer cable connector.
5) Before assembling the panel, consider
using the provided adjusting screw in order to optimize the operation of
the mechanical button. If needed, assemble the adjusting screw to the
mechanical button at the internal side of the panel and adjust it to the
desired distance.

9
NARA 2032 E
INSTALLATION
10) Wait about 30 seconds before you step or put your hand within the sensor
range. As an indication that the self adjusting is taking place, a red light in the
sensor eye will flash continuously. The solenoid valve will be opened and closed
for 1 second as an indication that the ideal sensor range was set and the product is
ready for use.
11) To operate, step within the sensor range for a minimum of 8 seconds.
Move away and the flush valve will flush a few seconds after your departure.
12) If needed adjust the flow rate by turning the regulating valve. In order
to avoid entering into the self adjusting mode, do not disconnect the cables
between the electronic unit and the transformer.
13) If the range is unsatisfactory, refer to the section entitled “Settings
Adjustment”.
6) Assemble the panel to the cover seat and
tighten it with the bottom screw.
7) The ideal sensor range for the specific location
will be set automatically. Right now, check that no
objects are in front of the sensor.
8) Remove the protective sticker covering the sensor.
9) Plug in the transformer. Keep away from the sensor range.

10
INSTALLATION NARA 2032 P
Step 1 – Installing the flush valve and connecting the water supply
1) Shut off the water supply.
2) Cut an adequate opening in the wall for the dimensions of
the box and the sleeve (not supplied).
3) Insert the electronic flush valve’s box through the opening.
4) Connect the flush valve inlet to the water supply.
5) Connect the flush valve outlet nipple to the pipe leading to
the W.C.’s inlet.
6) Turn on the water supply. Make sure there is no water
leakage.
7) Assemble the temporary protective cover to protect the flush valve.
Step 2 – Connecting the power source
1) Once the electricity, plumbing and tiles works are finished,
replace the temporary protective cover with the plastic seat.
Adjust it using the four screws provided.
2) Now, connect the connectors
going out from the electronic unit:
a. Connect the blue cable connector
to the blue cable connector coming
out from the piezo button.
b. Connect the electronic unit
connector that leads to the
solenoid valve to the solenoid valve
connector.
c. Connect the electronic unit
connector that leads to the power
source to the battery box connector.

11
NARA 2032 P
INSTALLATION
7) Wait about 30 seconds before you step or put your hand within the sensor
range. As an indication that the self adjusting is taking place, a red light in the
sensor eye will flash continuously. The solenoid valve will be opened and closed
for 1 second as an indication that the ideal sensor range was set and the product is
ready for use.
8) To operate, step within the sensor range for a minimum of 8 seconds.
Move away and the flush valve will flush a few seconds after your departure.
9) If needed adjust the flow rate by turning the regulating valve. In order to
avoid entering into the self adjusting mode, do not disconnect the cables
between the electronic unit and battery box.
10) If the range is unsatisfactory, refer to the section entitled
“Settings Adjustment”.
11) Tighten the panel to the cover seat with the bottom screw.
3) Insert the battery into the battery box.
5) The ideal sensor range for the specific
location will be set automatically. Right
now, check that no objects are in front of
the sensor.
6) Remove the protective sticker covering the
sensor and move away from the sensor range.
Pay atention, steps 3-6 must be completed within 30 seconds:
30
sec
4) Assemble the panel to the cover seat. Do not tighten the
bottom screw yet.

12
Step 1 – Installing the flush valve and connecting the water supply
1) Shut off the water supply.
2) Cut an adequate opening in the wall for the dimensions of
the box and the sleeve (not supplied).
3) Insert the electronic flush valve’s box through the opening.
4) Connect the flush valve inlet to the water supply.
5) Connect the flush valve outlet nipple to the pipe leading to
the W.C.’s inlet.
6) Turn on the water supply. Make sure there is no water
leakage.
7) Assemble the temporary protective cover to protect the flush valve.
Step 2 – Connecting the power source
INSTALLATION NARA 2032 PE
1) Once the electricity, plumbing and tiles works are finished,
replace the temporary protective cover with the plastic seat.
Adjust it using the four screws provided.
2) Connect the following connectors coming from
the electronic unit:
a. Connect the blue cable connector to the blue
cable connector coming out from the piezo
button.
b. Connect the electronic unit connector that
leads to the solenoid valve to the solenoid valve
connector.
3) Assemble the panel to the cover seat and tighten it with
the bottom screw.

13
NARA 2032 PE
INSTALLATION
8) Wait about 30 seconds before you step or put your hand within the sensor
range. As an indication that the self adjusting is taking place, a red light in
the sensor eye will flash continuously. The solenoid valve will be opened and
closed for 1 second as an indication that the ideal sensor range was set and the
product is ready for use.
9) To operate, step within the sensor range for a minimum of 8 seconds. Move
away and the flush valve will flush a few seconds after your departure.
10) If needed adjust the flow rate by turning the regulating valve. In order to avoid
entering into the self adjusting mode, do not disconnect the cables between the
electronic unit and battery box.
11) If the range is unsatisfactory, refer to the section entitled “Settings
Adjustment”.
6) Connect the electronic unit connector that leads to the power source to the
battery back up device connector.
Connect the other connector coming from the battery back up device to the
transformer connector.
4) The ideal sensor range for the specific location
will be set automatically. Right now, check that no
objects are in front of the sensor.
5) Remove the protective sticker covering the sensor.
7) Before inserting the six 1.5V batteries to the battery back up device, plug in
the transformer. Now, insert the batteries into the battery back up device box.
Keep away from the sensor range.

14
Battery replacement instructions – Nara 2032 / 2032 P
When the battery weakens, the red indicator light will blink at a constant
rate. The battery must be replaced within two weeks. Always use batteries
from a reputable source. Poor quality batteries may affect the performance
of the product.
To replace the battery:
1. Release the screw at the bottom of the cover plate and remove the cover
plate.
2. Carefully open the battery box.
3. Replace the used battery with a new 9V battery (Lithium battery is
recommended).
4. Close the battery box.
5. Refit the wall cover plate.
BATTERY REPLACEMENT
Check that there are no objects in
front of the sensor after the battery
replacement was completed.
After you have replaced the battery,
move away from the sensor range. Wait
30 seconds in order to allow the system
to set the ideal sensor range. Then after
the self adjustment has taken place the
solenoid valve will be opened and closed
for 1 second as an indication that the ideal
sensor range was set and the product is
ready for use.
Important: Spent batteries should not be disposed of with
normal household waste. Contact your local authority for
information on waste disposal and recycling.

15
S E T T I N G S ADJUSTMENT
Adjusting the sensor range with the remote control
This flush valve was supplied with Stern’s new Self Adjusting Sensor. The ideal
detection range for the specific location will be set automatically.
TEMPORARY OFF FUNCTION
DELAY IN TIME
DETECTION RANGE DELAY OUT TIME
RESET
ENTRANCE TO THE
SELF ADJUSTMENT MODE
SHORT FLOW TIME FULL FLOW TIME
DETECTION RANGE: Only if necessary, use the remote control to
adjust the sensor range as follows:
Hold the remote control straight in front of the sensor in a distance
of about 8-10” (20-25cm). Choose the function RANGE by pressing
once at the range function button. After pressing this function
button, a quick flashing of the red light at the front of the sensor
will occur. At this stage, you can increase or decrease the sensor
range by pressing the (+) or the (-) buttons, every push will increase
or decrease one level.
Note: Once you have changed the detection range with the remote control,
this distance will be remembered by the sensor, even if the power source is
disconnected. To get back to the self adjustment mode, use the ADJ button only.

16
S E T T I N G S ADJUSTMENT
DELAY IN TIME: It is recommended to change the delay in time for
flush valves for urinals or toilets only. Due to the delay in setting, the
sensor will only activate the system if the user is detected for the preset
amount of seconds.
If required, the delay in time can be modified as follows: Press the IN
button. Wait until a quick flashing of the red light of the sensor eye is
perceived. Then, press + to increase the delay in time and – to reduce it.
SHORT FLOW TIME: This function determines the water flushing
time once the user leaves the W.C. after being present in front of the
sensor for less than a minute. If required, the short flow time can be
modified as follows:
Press the one wave button. Wait until a quick flashing of the red light
of the sensor eye is perceived. Then, press + to increase the flow time
and – to reduce it.
FULL FLOW TIME: This function determines the water flushing time
once the user leaves the W.C. after being present in front of the
sensor for a minute or more.
Press the two waves button. Wait until a quick flashing of the red light
of the sensor eye is perceived. Then, press + to increase the flow time
and – to reduce it.
ENTRANCE TO THE SELF ADJUSTMENT MODE: Check that no objects
are in front of the sensor. Press the ADJ button. Once a quick flashing
of the red light of the sensor eye is perceived, remove your hand
holding the remote control and move away from the sensor area. The
ideal sensor range for the specific location will be set automatically.
Ones the self adjustment has taken place the solenoid valve will be
opened and closed for 1 second as an indication that the ideal sensor
range was set and the product is ready for use.
Adjusting other settings with the remote control

17
S E T T I N G S ADJUSTMENT
DELAY OUT TIME: This function allows modifying the time the flush
valve will deliver water after the user leaves the W.C. In this case,
a delay out time close to 0 will not give the user the possibility to be
away from the sanitary. An increased delay out time will make the
user experience more comfortable, but high traffic of users should
be taken into consideration. If required, the delay out time can be
modified as follows:
Press the OUT button. Wait until a quick flashing of the red light at the
sensor eye is perceived. Then, press + to increase the delay out time
and – to reduce it.
TEMPORARY OFF FUNCTION: This function is ideal to perform any
kind of activity in front of the sensor without operating the system (for
example, cleaning).
The flush valve will remain shut for 1 minute when this button is pressed
once. To cancel this function and to return to normal operation press
the On/Off button again or wait 1 minute.
RESET BUTTON: This function restores all the factory settings except
for the sensor range. If required, press the Reset button and without
releasing it, press the + button once.
Note: To enter the self adjusting mode, use the ADJ button. To change the sensor
range, use the RANGE button.

18
Care and cleaning of chrome and special finishes
DO NOT use steel wool or cleansing agents containing alcohol, acid, abrasives, or
the like. Use of any prohibited cleaning or maintenance products or substances
could damage the surface of the flush valve. For surface cleaning use ONLY soap
and water, then wipe dry with clean cloth or towel. When cleaning bathroom tile, the
flush valve should be protected from any splattering of harsh cleansers.
If system chemical disinfection is practiced, chlorine can be used (calculated
chlorine concentration of 50mg/l maximum in water per one hour dwell time)
at service interval frequency.
MAINTENANCE
Y. Stern Engineering Ltd. warrants that its electronic faucets, flush valves and controls
will be free of defects in material and workmanship during normal use for two years from
the date the product is purchased.
If a defect is found in normal use, Y. Stern Engineering Ltd. will, at its discretion, repair,
provide a replacement part or product, or make appropriate adjustments. Damage
caused by accident, misuse, or abuse is not covered by this warranty. Improper care
and cleaning will void the warranty. Proof of purchase (original sales receipt) must be
provided to Stern Engineering Ltd. with all warranty claims.
Stern Engineering Ltd is not responsible for labor charges, installation, or other incidental
or consequential costs other than those noted above. In no event shall the liability of
Stern Engineering Ltd. exceed the purchase price of the faucet, valve or control.
If you believe that you have a warranty claim, contact your Stern Distributor, Dealer
or Plumbing Contractor. Please be sure to provide all pertinent information regarding
your claim, including a complete description of the problem, the product, model number,
the date the product was purchased, from whom the product was purchased and the
installation date. Also include your original invoice.
Y. STERN ENGINEERING AND/OR SELLER DISCLAIM ANY LIABILITY FOR SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES. This warranty excludes product damage
due to installation error, incorrect maintenance, wear and tear, battery, water composition,
product abuse, or product misuse, whether performed by a contractor, service company,
or the consumer. This warranty does not cover product damage caused by the following:
- Incorrect installation, inversions of supply pipes.
- Pressures or temperatures exceeding recommended limits.
- Improper manipulation, tampering, bad or lapsed maintenance.
- Foreign bodies, dirt or scale introduced by the water supply.
WARRANTY