Stern Engineering D28 Series User manual

1
WALL MOUNTED ELECTRONIC FAUCET FOR COLD OR PREMIXED WATER
D28 SERIES
D28 B D28 E D28 Dual Power B D28 Dual Power E D28 Box D28 Box E

INDEX
1 TECHNICAL DATA
2-4 PACK CONTENTS
5 PRE-INSTALLATION INFO
6-11 FAUCET INSTALLATION
12-14 SETTINGS ADJUSTMENT
15 BATTERY REPLACEMENT
16 MAINTENANCE
Filters cleaning instructions
Care and cleaning of chrome and special finishes
17-19 SPARE PARTS LIST
20 TROUBLE SHOOTING
21 LIMITED WARRANTY

1
TECHNICAL DATA
D28 WALL MOUNTED ELECTRONIC FAUCET FOR COLD OR PREMIXED WATER
Power supply for D28 B model:
Power supply for D28 Box B model:
Power supply for D28 Dual Power B model:
Power supply for E models:
Min Operating Water Pressure:
Max Operating Water Pressure:
Sensor range:
Minimum sensor range:
Maximum sensor range:
Security time:
Hot water temperature:
6x1.5V AA battery
9V Lithium battery
9V Lithium battery
9V transformer
0.5 bar (7 PSI)
8.0 bar (116 PSI)
With water pressure of more than 8
Bars, use a pressure reducing valve
Self adjusting sensor. Adjustable with
remote control
40 mm
170 mm
90 seconds. Can be reduced with
remote control
Max 70˚C

2
PACK CONTENTS D28
1 x Spout and attachments
(incl. electronic unit)
M 4 x 4 set screw
1x D28 base 1 x Wall rosette
B VERSIONS E VERSIONS
IP67 Battery Box Transformer
1x Solenoid housing kit
with inlet nipple and filter

3
PACK CONTENTS D28 DUAL POWER
1 x Spout and attachments
(incl. electronic unit)
M 4 x 4 set screw
1 x Wall rosette
1x D28 base
1 x Corrugated
Tube
1x Dual power
input box with
inlet nipple and
filter
B VERSIONS
E VERSIONS
1x Dual power
input box with
inlet nipple and
filter
1 x Transformer

4
PACK CONTENTS D28 BOX
B VERSIONS E VERSIONS
9V Battery Box Transformer
1 x Plastic box
with concealed solenoid valve
1 x Temporary
protective panel
1 x Spout and attachments
(incl. electronic unit)
M 4 x 4 set screw
1x D28 base 1 x Wall rosette
1 x Panel with
battery box
Screw M 3 x 6
1 x Corrugated
Tube
1 x Rigid pipe
(not supplied)

5
PRE-INSTALLATION INFO
Check contents
Separate all parts from the packaging and check each part with the pack
contents section. Pay attention to the variations of the different models.
Make sure all parts are accounted for before discarding any packaging
material.
If any parts are missing, do not attempt to install your electronic faucet
until you obtain the missing parts.
Preparation for installation
Flush water supply lines thoroughly before installing the faucet. Do not
allow dirt, Teflon tape or metal particles to enter the faucet. Shut off
water supply.
Important
All plumbing is to be installed in accordance with applicable codes and
regulations.
Warning
To avoid reflection problems keep a distance of more than 300 mm.
between the sink and the spout.
1. Keep a distance of more
than 300 mm. between the
sink and the spout.
To avoid reflection problems
2. Do not place a shiny
pop up in front of the
sensor.

6
FAUCET INSTALLATION D28
Step 1 – Installing the faucet
1. Shut off the water supply
2. Drill a hole (23 to 24 mm) at the place where you want to install the spout of
the tap.
3. Your model includes an optional anti-rotation pin. Drill a small hole just above
the previous one for the anti-rotation pin.
4. Insert the D28 and its attachments through the wall. The aerator in the D28
spout must face the washbasin.
5. Insert the anti-rotation pin into the small hole (if needed)
6. Fix the base behind the wall with the hexagonal nut and the disk.
Step 2 - Connecting the water supply
1. Fit the flexible pipe coming from the D28
base to the solenoid valve housing.
2. Fit the water supply inlet to the inlet nipple
at the solenoid valve housing.
Note: Make sure the filter is located at the
solenoid inlet.
3. Connect the cable coming from the electronic
unit to the solenoid valve.
Important: D28 was supplied with a Self Adjusting
Sensor. The ideal sensor range for the specific
location will be set automatically.

7
FAUCET INSTALLATION D28
Before proceeding to step 3 check that
no objects are in front of the sensor
besides the washbasin.
Now, remove the protecting sticker that
covers the sensor.
Step 3 – Connecting the power source
1. For D28 B: Connect the other cable coming from the electronic unit at the D28
base to the battery box.
2. For D28 E: Connect the other cable coming from the electronic unit at the D28
base to the transformer. Plug the transformer into the electricity socket.
3. After you have connected the power source
(Battery or Transformer) wait 15 seconds in order
to allow the system to set the ideal 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.
4. Turn on the central water supply. Check for
leaks.
5. If the automatically adjusted sensor range is
not satisfactory, please refer to the section entitled “Settings adjustment”.

8
FAUCET INSTALLATION D28 DUAL POWER
Step 1 – Installing the faucet
1. Shut off the water supply
2. Cut an adequate opening in the wall for the dimensions of the D28 base (where
you want to install the spout), and the corrugated tube.
3. Install the D28 dual power base and its attachments through the opening that
was cut in the wall.
4. Mount the D28 base to the opening cut in the wall, and set
it using the two small anchors provided. (See FIG. 1)
Important: The D28 base should be installed so that the
outside surface of the finished wall falls between the
minimum and maximum lines marked at the base.
5. Assemble the temporary protective D28 base cover.
(See FIG.2)
6. Make sure the corrugated tube will stay
outside the wall when tiling.
7. Once the works on electricity, plumbing
and tiles have been finished, insert the
wall rosette through the D28 base.
8. Cut the temporary D28 base cover.
9. Pull the four way connector out of the D28 base, and lead
it along with the flexible tube, through the corrugated tube.
10. Connect the flexible tube to the solenoid valve body
integrated in the dual power input box. (See FIG.3)
11. Fix the D28 spout by inserting the nipple into the D28 base
and tighten the screw.
OPERATION:
This faucet features an IP67 dual power input box. The product can be operated
with a 9V battery or a 9V transformer. In addition, when used with a transformer,
the product contains an integrated battery back up, for normal use during power
supply failures.

9
FAUCET INSTALLATION D28 DUAL POWER
1. If your model is D28 Dual Power B a 9V battery is already installed in the dual
power input box. To do that, remove the rubber seal covering the connectors
socket.
2. If your model is D28 Dual Power E, connect the transformer to the transformer
socket in the dual power input box.
3. Connect the four contacts connector to the dual power input box.
Important: Make sure that the 4 contacts connector is connected all the way
through.
4. After you have connected the four contacts connector to the dual power input
box, wait 15 seconds in order to allow the system to set the ideal sensor range.
As an indication that the self adjusting has taken place, a red light in the sensor
eye will flash continuously. The solenoid valve will open and close for 1 second as
an indication that the ideal sensor range was set and the product is ready for use.
Check that no objects are in front of the
sensor besides the washbasin.
Now, remove the protecting sticker that
covers the sensor.
Step 3 – Connecting the water supply
1. Turn on the central water supply.
2. Check for leaks.
3. If the automatically adjusted sensor range is not satisfactory, please refer to the
section entitled “Settings adjustment”.
Step 2 - Connecting the power source
Important: D28was supplied with A Self Adjusting Sensor. The ideal sensor
range for the specific location will be set automatically.

10
FAUCET INSTALLATION D28 BOX
Step 1 – Installing the faucet
1. Shut off the water supply
2. Cut an adequate opening in the wall for the dimensions
of the D28 box, the corrugated tube, the rigid pipe and
the D28 base (where you want to install the spout).
3. Insert the D28 box to the opening that was cut in the
wall. Connect the water supply pipe to the nipple at the
bottom of the D28 box.
4. Mount the D28 base to the opening cut in the wall and make sure that the
spout is at a 90 degree angle with the wall.
Important: The D28 base should be installed so that the outside surface of the
finished wall falls between the minimum and maximum lines marked at the base.
5. Assemble the rigid pipe (not supplied) from the nipple at the box to the inlet
at the D28 base.
6. Assemble the corrugated tube between the D28 base and the box, and lead
the connectors through the D28 base and through the D28
box.
6. Assemble the temporary protective cover panel to the
D28 box.
7. Assemble the temporary protective D28 base cover.
(See FIG.4)
8. Once the works on electricity, plumbing and tiles have
been finished, insert the wall rosette through the D28 base.
9. Cut the temporary D28 base cover.
10. Connect the electronic unit connector coming from the
corrugated tube to the solenoid valve connector at the D28
box.
11. If your model is D28 Box E, connect the power supply
connector coming from the corrugated tube at the D28
base to the transformer. (See FIG.5)
12. Connect the solenoid valve cable and the power supply cable at the spout
to those at the D28 base.
13. Fix the D28 spout by inserting the nipple into the D28 base. Make sure that
this area is clean before proceeding. Secure the screw with the Allen key.

11
FAUCET INSTALLATION D28 BOX
Check that no objects are in front of the
sensor besides the washbasin.
Now, remove the protecting sticker that
covers the sensor.
2. If your model is D28 B Box the battery box is attached to the cover panel.
Connect the other electronic unit connector coming from the corrugated tube to
the battery box
3. If your model is D28 E Box, plug the transformer into the electricity socket.
4. After you have connected the power source (Battery or Transformer) wait
15 seconds in order to allow the system to set the ideal 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.
Step 3 – Connecting the power source
1. Turn on the central water supply.
2. Check for leaks.
3. Assemble the wall cover panel by screwing the four screws.
4. If the automatically adjusted sensor range is not satisfactory, please refer to the
section entitled “Settings adjustment”.
Step 2 - Connecting the power source
1. Remove the temporary protective cover panel.
Important: D28 was supplied with a Self Adjusting Sensor. The ideal sensor
range for the specific location will be set automatically.

12
SETTINGS ADJUSTMENT
TEMPORARY OFF FUNCTION
DELAY IN TIME
DETECTION RANGE DELAY OUT TIME
RESET
ENTRANCE TO THE
SELF ADJUSTMENT MODE
LOCK OUT TIME 24 HOUR HYGIENE FLUSH
Adjusting the settings with the remote control
If necessary, the sensor settings can be adjusted as following:
Shut off the water supply. In order to adjust the sensor with the remote control,
hold the remote control straight in front of the sensor in a distance of about
6-8” (15-20cm). Choose the function you want to adjust by pressing once on
one of the function buttons. After pressing once on a specific function button, a
quick flashing of the red light at the front of the sensor will occur. At this stage,
you can change the setting by pressing the (+) or the (-) buttons, every push will
increase or decrease one level. After finishing the adjustment, turn the water
supply back on.

13
SETTINGS ADJUSTMENT
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.
Once 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.
SECURITY TIME:The Security time, prevents continuous running
of water due to reflections or vandalism. By default, if the sensor
is covered for more than 90 seconds the water flow will shut
automatically. To resume regular operation any obstruction must be
removed.
Press the SEC button. Wait until a quick flashing of the red light of the
sensor eye is perceived. Then, press + to increase the security time
and – to reduce it.
DETECTION RANGE: This faucet was supplied with a Self Adjusting
Sensor. The ideal detection range for the specific location will be
set automatically.
Only if necessary, use the remote control to adjust the sensor
range as follows:
Press the RANGE button. Wait until a quick flashing of the red light of
the sensor eye is perceived. Then, press + to increase the delay out
time and – to reduce it 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.

14
S E T T I N G S ADJUSTMENT
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 faucet 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.
24 HOUR HYGIENE FLUSH: If you have a compatible model with a 24
hours hygiene flush it is possible to enable and disable it .
To activate the hygiene flush, press the clock button. Wait until a
quick flashing of the red light of the sensor eye is perceived. Then
press + to activate the hygiene flush or – to deactivate it.
DELAY OUT TIME: This button allows modifying the water flow time
after the user removes his hands from the faucet. A delay out time
close to 0 will save more water. An increased delay out time will make
the user experience more comfortable.
If required, the delay out time can be modified as follows:
Press the OUT button. Wait until a quick flashing of the red light of the
sensor eye is perceived. Then, press + to increase the delay out time
and – to reduce it.
DELAY IN TIME: It is recommended to change the delay in time for
flush valves for urinals or toilets only.
If required, the delay in time can also be modified in faucets 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.

15
BATTERY REPLACEMENT
Battery models only
When the battery weakens, the red indicator light will blink at a constant
rate when the user’s hands are within the sensor range. The battery must
be replaced within two weeks.
To replace the battery (battery models only):
1. For D28B: Open the battery box carefully and remove the old batteries.
Replace the used batteries with six new 1.5V AA batteries. Close the box.
2. For D28 Dual Power B: Open the dual power input box carefully, using the
Allen key provided. Remove the old battery and replace it with a new 9V
battery (Lithium battery is recommended). Close the box.
3. For D28B Box: Release the screws at the panel and remove it. The battery
box is located behind the panel. Open the battery box carefully and remove
the old battery. Replace the used battery with a new 9V battery (Lithium
battery is recommended). Close the box and re-assemble the wall cover
panel.
Important: D28 was supplied with A Self Adjusting Sensor. The ideal
sensor range for the specific location will be set automatically again after
changing the battery.
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 15 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.

16
MAINTENANCE
Filter cleaning instructions
This faucet is provided with a stainless steel filter preventing foreign particles to
enter the lines. If the water flow has decreased, this may be because the filter
is clogged. The filter can be cleaned as follows:
1. For D28B, D28E, D28CB and D28CE:
a. Shut-off the water shut off valve.
b. Disconnect the water supply pipe from the adaptor and disassemble the
filter from it.
c. Wash the filter under running water.
d. Reassemble the parts.
e. Restore the incoming water supply.
f. Make sure that there is no water leakage.
2. For D28Box, D28Box E:
a. Release the screws at the panel and remove it. Turn off the regulating
valve.
b. Disassemble the solenoid valve by opening the nuts.
c. Remove the filter and wash it under running water.
d. Reassemble the filter.
e. Reassemble the solenoid valve.
f. Turn on the regulating valve and adjust the flow capacity.
g. Make sure that there is no water leakage. Re-assemble the wall cover
panel.
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 faucet. For surface cleaning of
faucet us ONLY soap and water, then wipe dry with clean cloth or towel. When
cleaning bathroom tile, the faucets should be protected from any splattering of
harsh cleansers.

17
SPARE PARTS LIST D28
Screws Kit
Nano Sensor
Solenoid BS-Housing Kit
Solenoid BS-Housing Kit for USA
Solenoid Valve Kit
Diaphragm
IP 67 Battery box
Battery box
07210101
08004001
07231008
07231009
07230017
04500001
06530020
06530008

18
SPARE PARTS LIST D28 DUAL POWER
Seals and Screws Kit
Nano Sensor
Solenoid Housing Dual Power Kit
Solenoid Housing Dual Power Kit USA
Stern Interoperable LS9V12WC1
Dual Power Cover Kit
Transformer
07210102
08004012
07231011
07231012
07500068
07220080
06522047