Stern VENUS COMFORT 2031 DF Product manual

1
INSTALLATION AND MAINTENANCE GUIDE
DUAL FLUSH ELECTRONIC TOILET FLUSH VALVE
OPERATED BY PIEZO ELECTRIC TECHNOLOGY
VENUS COMFORT 2031 DF / 2031
DF
E

INDEX
1 TECHNICAL DATA
1 OPERATION
2PACK CONTENTS
3 PRE-INSTALLATION INFO
3-4 INSTALLATION
5-6 FLOW TIME ADJUSTMENT
7 24 HS HYGIENE FLUSH
8BATTERY REPLACEMENT INSTRUCTIONS
8CARE AND CLEANING
8LIMITED WARRANTY
9 SERVICE CHECK LIST
9 SPARE PARTS LIST

1
TECHNICAL DATA
Power specification: 9V low voltage system
Power Supply: Internally mounted 9V battery or 9V transformer
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.
Default flow rate: 3L / 6L
Programmable flow time: Maximum 15 seconds
24 Hours hygiene flush: Optional. See 24 hs hygiene flush section
OPERATION
The flush valve delivers a full flush (default value 6 liters) when the user touches
the button with two waves. It delivers half a flush (default value 3 liters) when
the user touches the button with one wave.

2
PAC K CO N T E N T S
Venus Comfort 2031 DF
1. 1 x Plastic box with
concealed flush valve
2. 1 x Wall cover plate with
two piezo buttons
3. 1 x Plastic seat for the
cover plate
4. 1 x Temporary protective
cover
5. 4 x Screws
6. 1 x Allen key
7. 1 x Battery box with battery
Familiarize yourself with the
part names and confirm that
the parts are included:
Venus Comfort 2031 DFE
1. 1 x Plastic box with
concealed flush valve
2. 1 x Wall cover plate with
the electronic unit
3. 1 x Plastic seat for the
cover plate
4. 1 x Temporary protective
cover
5. 4 x Screws
6. 1 x Allen key
7. 1 x Transformer
7. 1 x Battery box with battery
1.
2.
3.
4.
5.
1.
2.
3.
4.
6.
6.
5.
7.
7.

3
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 your Venus flush valve until you obtain the missing parts.
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.
Shut off water supply.
Important
All plumbing is to be installed in accordance with applicable
codes and regulations.
INSTALLATION
1) Shut off the water supply.
2) Cut an adequate opening in the wall for the
dimensions of the box. If your model is Venus Comfort
2031 DFE make room for 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 toilet’s inlet.
6) 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.
7) If your model is Venus Comfort 2031DFE, place the transformer cable near the
electricity plug and thread the transformer’s wire to the box.

4
INSTALLATION
8) Connect the “power splitter to power source” coming from the piezo buttons to the
power supply connector (battery box or transformer). See drawing below.
9) Connect the “power splitter to solenoid” coming from the piezo buttons to the solenoid
connector. See drawing below.
10) Turn on the water supply. Make sure that there is no water leakage.
11) If your model is Venus Comfort 2031 DF stick the battery box inside the product box
using the two sided adhesive foam tape. The cable connection must point down.
12) Assemble the wall cover panel to the cover seat and tighten it with the bottom
screw.
13) If your model is Venus Comfort 2031 DFE plug
the transformer to the main electricity supply.
14) To activate the flush valve touch one of the
piezo buttons according to needed amount of
water.
15) If needed adjust the flow capacity by turning
the regulating valve.
16) If you need to change the flow time, please
refer to the “Flow time adjustment” section.
12) Assemble the wall cover panel to the cover seat and tighten it with the bottom
connector. See drawing below.

5
FLOW TIME ADJUSTMENT
Adjustment levels
If necessary, the default flow time of each piezo
button can be adjusted to any value up to a
maximum of 15 seconds. The Piezo adjustment
mechanism is composed by 3 adjustment levels.
To set the desired flow time you need to arrive to
the appropriate adjustment level and press at the
center of the piezo button that you would like to
adjust. An indicator light (LED) will let you know
when you have passed between one level to the
other.
Each adjusting level has a number of steps to
arrive to the next level. The duration of each step
is different at each level. The following table shows the number of steps, its duration at
each level and how you can recognize that you have passed to the next level.
Level 1 Level 2 Level 3 Level 4
No. of steps
Seconds to be increased by
touching once
Adjustment level indicator
10 steps 10 steps
0.5 sec 1 sec
After
entering
into
adjusting
mode level
1 is reached
Indicator
light blinks
twice
Indicator light
blinks 3 times
Level 1 Level 2 Level 3
Level 1 Level 2 Level 3
Level 1 Level 2 Level 3
10 steps 10 steps
10 steps 10 steps
10 steps 10 steps
10 steps 10 steps
10 steps 10 steps
10 steps 10 steps
0.5 sec 1 sec
0.5 sec 1 sec
0.5 sec 1 sec
0.5 sec 1 sec
Level 1 Level 2 Level 3
Out of adjusting
mode
Indicator light
blinks 4 times
Enables the 24 hs
hygiene flush
The following example shows how to manage the adjustment levels:
You want to adjust the flow time of the full flush to 1.5 seconds.
First choose the flush button to perform the adjustment (button for the full flush or button
for the short flush)
At level 1 perform 1 step of 0.5 seconds (you will get 0.5 seconds). Total: 0.5 seconds
Go to level 2 and perform 1 step of 1 second (you will get 1 second). Total: 1.5 seconds)
Alternatively, to get 1.5 seconds you can also touch 3 times the button at level 1 to get
0.5 x 3 = 1.5 seconds.
Adjust only if necessary.

6
FLOW TIME ADJUSTMENT
How to adjust the flow time
1) Release the cover plate with the piezo buttons using the provided Allen key. See the
figure below.
2) Disconnect the power supply from the piezo button that you would like to adjust. To
do it, disconnect the connector from the piezo button that leads to the power splitter to
power source. Do not disconnect the connector coming from the other piezo button or
the connector to the solenoid valve.
3) Touch the piezo button twice.
4) Reconnect the power supply by connecting again the connector coming from the
piezo button to the power splitter to power source.
5) The indicator light (LED) at the internal side of the piezo button will start blinking. After
a few blinks the LED will give a steady red light. Touch the piezo button when the steady
red light is still on to enter the adjusting mode. When done correctly, the light will stop
blinking.
Note: If you will not press at the indicated area, the previous adjustment will remain.
6) By touching the piezo button the new flow time will be programmed. In adjusting mode
level 1, each touch increases the flow time by 0.5 seconds with a maximum of 5 seconds.
You will see the LED blinking every time that a new step is performed.
7) If you do not need more levels stop pressing. The LED will blink 2 times, then 3 times,
and after that 4 times to leave the adjusting mode. When that occurs, the specific button
at the Venus Comfort 2031 DF will be adjusted to the desired flow time.
8) If you need to perform steps at adjusting level 2, wait after you see the LED blinking
twice and then, perform the needed quantity of steps (with a maximum of 10 steps of 1
second).
9) If you do not need more levels stop pressing. The LED will blink 3 times, and after that
4 times to leave the adjusting mode. When that occurs, the specific button at the Venus
Comfort 2031 DF will be adjusted to the desired flow time.
10) Wait until the indicator light will blink 3 times and then 4 times. When that happens, it
means that the specific piezo button was adjusted to the desired flow time.
Attention: The settings are now adjusted and will remain unchanged even if the power
source is disconnected.

7
24 HS HYGIENE FLUSH
Venus Comfort 2031 allows you to enable a 24 hygiene flush factory setting. When
you enable this function, an hygiene flush will occur once in 24 hours when no one
has touched the piezo full flush button.
The default factory setting is that the product will not perform an hygiene flush. In
order to enable the function follow the instructions below:
1) Release the cover plate with the piezo buttons using the provided Allen key.
2) Disconnect the power supply from the full flush piezo button. To do it,
disconnect the connector from the piezo button that leads to the power splitter
to power source. Do not disconnect the connector coming from the other piezo
button or the connector to the solenoid valve.
3) Touch the piezo button twice.
4) Reconnect the power supply by connecting again the connector coming
from the piezo button to the power splitter to power source.
5) The indicator light (LED) at the internal side of the piezo button will start
blinking. After a few blinks the LED will give a steady red light. Touch the piezo
button when the steady red light is still on to enter the adjusting mode. When
done correctly, the light will stop blinking.
Note: If you will not press at the indicated area, the previous situation will
remain (with or without hygiene flush).
6) In order to enable or disable the hygiene flush you will need to arrive to
the adjusting level 3. After you arrive to the adjusting mode, wait until the LED
blinks one time , two times and then when it blinks 3 times, touch the piezo
button to enable or disable the hygiene flush.
7) The LED will blink 4 times to leave the adjusting mode. When that occurs,
the full flush button at the Venus Comfort 2031 DF will perform now a 24 hours
hygiene flush.
Important:
• Once you have enabled this function, you will need to perform exactly the
same steps in order to disable it.
• The hygiene ush is now set and will remain unchanged even if the power
source is disconnected.
• The duration of the 24 hours hygiene ush is the one that was factory set for
the full flush.
Only to be performed by authorized personnel

8
BATTERY REPLACEMENT
1.Release 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.Reaffix the wall cover plate.
LIMITED WARRANTY
This product is covered by a limited warranty of two years from date of purchase.
During this period, STERN undertakes, at its option, to repair or replace any faults
caused by defective materials or manufacturer defaults that may arise (see Stern
Warranty).
The guarantee does not cover faults or damage caused by incorrect installation and/
or maintenance, wear and tear, battery, or water composition. This includes, but is not
limited to 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.
CARE AND CLEANING
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.

9
SERVICE CHECK LIST
No water is coming
out of the flush valve
Water flow does not stop
Check the flow time. If needed adjust it
following the instructions at the Flow time
adjustment section.
Check the solenoid valve. If debris or scale is
present, unscrew the solenoid valve, pull out
the plunger and the spring and clean them.
Use scale remover if needed. When replacing
the spring, make sure that it is in vertical
position.
Check the flow time. See page 5.
Check the connection between the piezo button
connector, the power splitter to the solenoid and
the solenoid connector.
Check that the battery box is correctly connected.
Check the solenoid valve. If debris or scale is
present, unscrew the solenoid valve, pull out the
plunger and the spring and clean them.
Use scale remover if needed. When replacing the
spring, make sure that it is in vertical position.
Check the piston. If needed, clean or replace it.
Check the water supply pressure. It must be 1.0-
8.0 bar (14.5 – 116.O PSI). With water pressure of
more than 8 Bars, use a pressure reducing valve.
Panel Kit
Solenoid Valve Kit with Acetal Body
Piston Kit
Piston + Piston Cover Kit
Short Flush Piezo Button
Full Flush Piezo Button
Battery box
Transformer
PART NAME PART CODE
SPARE PARTS LIST
07040121
07230015
07290011
07290018
07225092
07225091
06530008
06522025

10
15 Gan Rave Blvd., 81222 Gan Rave, Yavne, Israel
Tel: [phone], Fax: [phone], [email protected]
www.sternfaucets.com
015610600 05.09
15 Gan Rave Blvd., 81222 Gan Rave, Yavne, Israel
Tel: [phone], Fax: [phone], [email protected]
www.sternfaucets.com
015410442 06.09