Kohler K-3901 User manual

Installation Guide
Toilet
Mproduct numbers are for Mexico (i.e. K-12345M)
Los números de productos seguidos de Mcorresponden a México
(Ej. K-12345M)
Français, page “Français-1”
Español, página “Español-1”
K-3901
1212876-2-B

Important Information
NOTE: This product is designed for installation with the electrical and water supplies located through
either the wall or the floor.
Grounding Instructions
•This product should be grounded. In the event of an electrical short circuit, grounding reduces the
risk of electric shock by providing an escape wire for the electric current. This product is equipped
with a cord having a grounding wire with a grounding plug. The plug must be plugged into an
outlet that is properly installed and grounded.
WARNING: Risk of electric shock. Improper use of the grounding plug can result in a risk of
electric shock.
•If repair or replacement of the cord or plug is necessary, do not connect the grounding wire to either
flat blade terminal. The wire with insulation having an outer surface that is green with or without
yellow stripes is the grounding wire.
•Check with a qualified electrician or service personnel if the grounding instructions are not
completely understood, or if in doubt as to whether the product is properly grounded.
•This product is factory equipped with a specific electric cord and plug to permit connection to a
proper electric circuit. Make sure that the product is connected to an outlet having the same
configuration as the plug. No adapter should be used with this product. Do not modify the plug
provided — if it will not fit the outlet, have the proper outlet installed by a qualified electrician. If
the product must be reconnected for use on a different type of electric circuit, the connection should
be made by qualified service personnel.
Tools and Materials
Drill with Assorted Bits Assorted
Screwdrivers Wax Ring
Adjustable Wrench
Plus:
• Protective Material
• Tape
• Water Hammer Arrestor
Offset Screwdriver
1212876-2-B 2 Kohler Co.

Before You Begin
WARNING: Risk of electric shock. Disconnect power before servicing.
WARNING: Risk of electric shock. For plug-in installations/wall-mounted electrical supply:
Connect only to a properly-grounded, grounding-type receptacle which is protected by a dedicated
120 V, 15 A minimum, 60 Hz Ground-Fault Circuit-Interrupter (GFCI) or Residual Current Device
(RCD). Do not remove the grounding pin or use a grounding adapter.
CAUTION: Risk of personal injury. This toilet weighs approximately 100 lbs (45 kg). Lift the toilet
with two people, employing proper lifting technique.
CAUTION: Risk of hazardous gases. If a new toilet is not installed immediately, temporarily place
a rag in the floor flange opening.
CAUTION: Risk of property damage. This toilet is not intended to be installed in buildings where
temperatures will drop below 32°F (0°C). The design of the toilet makes it difficult to remove all
water from the tank. If frozen, the water could damage the tank resulting in leaking.
IMPORTANT! Use the supply hoses provided with the fixture. Do not reuse the previously installed
hoses.
NOTICE: Follow all local plumbing and electrical codes.
IMPORTANT! This product requires a minimum static pressure of 30 psi (206.8 kPa) for satisfactory rim
wash performance.
IMPORTANT! There are two different remote control options for this model. Setup for the K-7420
premium remote control is included in this manual. If you do not have the premium remote control, refer
to the instructions packed with the K-7421 standard remote control for setup information.
2 Bushings
2 Caps
2 #10 x 1-1/2"
Screws
Supply Hose Clip
2 Mounting Blocks
(4) 5/16" x 2-1/2" Lag Bolts
(4) 5/16" Lag Bolt Anchors
Back Cover
(Through-the-Floor
Installations)
Parts Bag Contents
Other Parts
Kohler Co. 3 1212876-2-B

Before You Begin (cont.)
IMPORTANT! If the remote control option with this model is the K-7420 premium remote control, install
the remote control before installing the toilet. It is more difficult to install the remote control after the toilet
is in place.
Carefully inspect the new toilet for damage.
Consult the online users guide at kohler.com for more information.
Confirm all parts below are included before beginning the installation.
Parts Bag Contents
(4) 5/16″x 2-1/2″Lag Bolts
(4) 5/16″Lag Bolt Anchors
2 Mounting Blocks
2 Plastic Caps
2 #10 x 1-1/2″Screws
2 Bushings
Other Parts
Back Cover (used in through-the-floor installations)
Supply Hose
Clip
1212876-2-B 4 Kohler Co.

Roughing-In - Wall Mount Electrical and Water Supply
WARNING: Risk of electric shock. Disconnect power before servicing.
WARNING: Risk of electrical shock. For plug-in installations/wall-mounted electrical supply:
Connect only to a properly-grounded, grounding-type receptacle which is protected by a
Ground-Fault Circuit-Interrupter (GFCI) or Residual Current Device (RCD). Do not remove the
grounding pin or use a grounding adapter.
NOTICE: The locations for the supply shut-off, electrical outlet, and docking station cord are suggested
locations. Make sure all installations adhere to applicable codes and standards.
IMPORTANT! Locating the supply stop behind the toilet will make it difficult to remove the back panel.
It may be necessary to remove the toilet to service items behind the back panel if the supply stop extends
more than 3″(76 mm) from the wall.
IMPORTANT! Consult the remote control documentation for the recommended remote control location.
IMPORTANT! Do not install any items behind the toilet that will interfere with the cover when it is
raised. All decorative items should be at least 37″(940 mm) high to allow clearance for the cover.
The supplied power cord is 56″(1422 mm) in length. Install the GFCI or RCD protected outlet
within 56″(1422 mm) of the toilet location.
The toilet is equipped with a motion sensor to automatically open the cover when movement is
sensed. This sensor has a maximum range of 51-1/2″(1300 mm). Sensitivity can be adjusted or
turned off using the User Interface.
The toilet is equipped with a sensor to automatically open the seat when the light is interrupted.
The sensor is located on the right side of the toilet. This sensor has a maximum range of 8″(203
mm). Keep this area free of obstructions.
Optional
Supply,
1/2" OD
Compression
Outlet Thread
Front of Bowl
Finished
Wall
C
L Of Outlet
Outlet
1/2" OD
Compression
Outlet Thread
Optional Supply
1/2" OD Compression
Outlet Thread
25-3/4"
(654 mm)
Ø 2-5/8"
(67 mm)
14-1/2"
(368 mm)
25-1/4"
(641 mm)
13-5/8"
(346 mm)
10-13/16" (275 mm)
3-3/4" (95 mm),
3-9/16" (90 mm) Min
29-1/2" (749 mm)
12"
(305 mm)
12" (305 mm)
15-5/8"
(397 mm)
2-1/4"
(57 mm)
1-3/4"
(44 mm),
1-1/2"
(38 mm)
Min
36-1/4"
(921 mm)
Power Cord
Reaches
56" (1422 mm)
C
4-3/4" (121 mm)
2" (51 mm)
17-7/8"
(454 mm)
6"
(152 mm)
8" (203 mm)
Kohler Co. 5 1212876-2-B

Roughing-In - Wall Mount Electrical and Water Supply (cont.)
1/2″OD compression supply stop outlet is required unless an adapter is used.
Installation of a water hammer arrestor is required.
1212876-2-B 6 Kohler Co.

Roughing-In - Through-the-Floor Water and Electrical
NOTICE: The locations for the supply shut-off, electrical outlet, and docking station cord are suggested
locations. Make sure all installations adhere to applicable codes and standards.
IMPORTANT! Do not install any items behind the toilet that will interfere with the seat when it is raised.
All decorative items should be at least 37″(940 mm) high to allow clearance for the seat.
IMPORTANT! Consult the remote control documentation for the recommended remote control location.
The supplied power cord is 56″(1422 mm) in length.
The toilet is equipped with a motion sensor to automatically open the cover when movement is
sensed. This sensor has a maximum range of 51-1/2″(1300 mm). Sensitivity can be adjusted using
the User Interface.
The toilet is equipped with a seat actuator sensor, located on the right side of the toilet. This sensor
has a maximum range of 8″(203 mm). Keep this area free of obstructions.
1/2″OD compression supply stop outlet is required unless an adapter is used.
Installation of a water hammer arrestor is required.
Front of Bowl
25-3/4" (654 mm)
Finished Wall
Ø 1-1/2" (38 mm)
Water Supply Hole
Ø 1-1/4" (32 mm)
Power Supply Hole
Ø 2-5/8"
(67 mm)
14-1/2"
(368 mm)
25-1/4"
(641 mm)
10-13/16" (275 mm)
3-3/4" (95 mm),
3-9/16" (90 mm) Min
29-1/2" (749 mm)
12"
(305 mm)
12"
(305 mm)
15-5/8"
(397 mm)
2-1/4"
(57 mm)
1-3/4"
(44 mm),
1-1/2"
(38 mm)
Min
36-1/4"
(921 mm)
4-3/4" (121 mm)
17-7/8"
(454 mm)
C
L Of Outlet
13-5/8"
(346 mm)
Kohler Co. 7 1212876-2-B

1. Prepare the Site
WARNING: Risk of electric shock. Disconnect power before installation or servicing.
WARNING: Risk of electric shock. Connect only to a properly-grounded, grounding-type
receptacle which is protected by a 120 V, 15 A minimum, 60 Hz Ground-Fault Circuit-Interrupter
(GFCI) or Residual Current Device (RCD). Do not remove the grounding pin or use a grounding
adapter.
WARNING: Risk of electrical shock. For hardwire installations/through-floor electrical supply:
Connect only to a properly-grounded, dedicated circuit protected by an Class A Ground-Fault
Circuit-Interrupter (GFCI) or Residual Current Device (RCD).
NOTE: The electrical outlet and water supply may also be located behind the toilet. If it is located behind
the toilet, the water supply stop must extend no more than 3″(76 mm) beyond the finished wall. If located
behind the toilet, the supply stop must be a model that connects at a 90° angle. The handle should be
easily accessible.
NOTE: Locating the supply stop behind the toilet will make it difficult to remove the back panel. It may
be necessary to remove the toilet to service items behind the back panel if the supply stop extends more
than 3″(76 mm) from the wall.
Install the Remote Control
NOTE: If the K-7421 standard remote control is included with your model, no cord is required.
Install the remote control docking station now following the installation instructions supplied with
the remote control.
Install the Water Supply
6"
(152 mm)
12" (305 mm) From
Finished Wall
Recommended,
11-3/4" (298 mm) Min
Supply Stop
Floor Flange
GFCI/RCD
Protected
Receptacle
3" (76 mm) Max
When Located
Behind Toilet
4"
(102 mm)
K-7420 Premium
Dock Power Cord
(not required
for K-7421)
2" (51 mm)
Ø 1-1/2" (38 mm)
Water Supply Hole
(for through-the-floor
installations only)
Ø 1-1/4" (32 mm)
Power Supply Hole
(for through-the-floor
installations only)
2-5/8"
(67 mm)
1-5/8"
(41 mm)
8" (203 mm)
1212876-2-B 8 Kohler Co.

Prepare the Site (cont.)
IMPORTANT! When installing the supply hose, connect it to the toilet first, then the supply stop.
NOTE: The supplied water supply hose is 18″(457 mm) in length. The supplied hose must be used for
this installation.
Install the water supply and supply stop.
Install a water hammer arrestor to the supply stop or water supply line.
Flush the water supply line into a pail or other container to remove all debris.
Install the Electrical Service
NOTE: The suppled power cord is 56″(1422 mm) in length.
Locate a dedicated 120 V, 15 A minimum, 60 Hz grounding-type receptacle, protected by a GFCI or
RCD, within 56″(1422 mm) of the back of the toilet.
Install External Speaker Wires (optional)
If external speakers will be used, install the speaker wires at this time.
Kohler Co. 9 1212876-2-B

2. Prepare the Installation Location
IMPORTANT! Risk of product damage. If T-bolts are left in place, they will damage the toilet. Make sure
they are removed before moving the toilet into place.
If there are T-bolts extending from the flange, remove them. T-bolts are not required for this
installation.
Cut out the inside of the flange area on the template.
Position the template with the hole positioned over the flange. It is critical that the centerlines
marked on the template are centered on the flange.
Secure the template to the floor with tape.
IMPORTANT! Because of the unique design of this toilet, the width of the bottom edges of the toilet will
vary. The following steps are required because of this variation.
Confirm the template is correctly positioned and centered over the flange.
Position the toilet on the template. Make sure the front of the base of the toilet is aligned with the
markings on the template.
Position the toilet so an equal amount of shaded area is visible on each side of the template.
Confirm the toilet is centered by measuring the amount of space on each side of the template.
Directly under the screw holes on each side of the toilet, accurately mark the bottom edge of the
base. The mark should intersect the lines labeled ″C″and ″A″or ″B″on each side of the template.
Template
Screw Hole
Center the toilet
on the template.
Top View
For Wall Supply
Installations Only
For Through-
the-Floor
Supplies Only
Tape
Flange
Flange Centerlines
1212876-2-B 10 Kohler Co.

3. Determine the Mounting Block Location
NOTE: There is a small amount of biodegradable, environmentally safe antifreeze added to the toilet tank
to prevent freezing during shipment. When the toilet is tipped forward, a small amount of the antifreeze
may run onto the floor. Make sure the floor is protected. Do not use a rug as protective material.
Position pieces of the box or other protective material on the floor directly in front of the toilet.
Gently tilt the toilet forward until it rests on the front surface.
NOTE: The installation range of the mounting block is marked on the template. Due to variances in the
width of the base, the exact location must be determined by the installer.
Measure the thickness of the base wall, dimension ″A,″on the left side of the toilet.
From the mark indicating the outside edge of the base, measure inward and mark dimension ″A″on
the template lines marked ″A.″
Draw a line connecting the marks on each of the lines labeled ″A.″
Measure the thickness of the base wall, dimension ″B,″on the right side of the toilet.
From the mark indicating the outside edge of the base, measure inward and mark dimension ″B″on
the template line marked ″B.″
Draw a line connecting the marks on each of the lines labeled ″B.″
IMPORTANT! Dimension ″C″is the distance between the inside edges of the right and left base. The
distance between the outside edges of the mounting blocks should be slightly less than dimension ″C.″
The distance between the edge of the outside edge of the mounting block and the inside edge of the base
must be 1/16″(2 mm) or less, or the strength of the mounting block will be compromised.
At the location of the screw holes in the side of the toilet, measure the width of the opening from
the inside edge of each side of the base, dimension ″C.″
A
B
C
Outside Edge
of Toilet
A
A
Top View
Protective Material
A
B
C
Kohler Co. 11 1212876-2-B

Determine the Mounting Block Location (cont.)
Measure dimension ″C″on the template, starting at the inside line.
Position a mounting block in the area indicated on the left side of the template. Align the outside
edge of the mounting blocks with the inside line.
Insert a pencil into each of the four pre-drilled holes in the mounting blocks and mark the center of
the holes.
Remove the mounting blocks.
At the four locations where the centerline in the slots marked on the template and the pencil mark
indicating the hole locations meet, drill a 3/16″pilot hole or 1/2″(13 mm) hole if anchors will be
used.
If anchors will be used, insert one of the supplied anchors in each of the holes.
Remove the template.
1212876-2-B 12 Kohler Co.

4. Install the Mounting Blocks and Wax Ring
Position the mounting blocks over the mounting holes.
Secure each of the mounting blocks with two of the supplied lag bolts.
Position a wax ring on the flange.
Connect the Supply Hose to the Toilet
Slide the supply hose outlet into the toilet water inlet.
Slide the clip over the flanges on the supply hose and inlet. Make sure both flanges rest in the gap
in the clip and are firmly held in place.
CAUTION: Risk of property damage. It is critical that the supply hose be firmly secured by the
clip. The supply hose could be displaced when under pressure if the clip is not correctly installed,
resulting in water damage.
Confirm the clip is firmly holding the supply hose in place. The clip will be able to rotate freely
with no significant resistance when properly installed.
For Through-
the-Floor
Supplies Only
Lag Bolt Wax
Ring
For Wall Supply
Installations Only
Hose Should Face
Down When Through
Floor
Clip
Flanges Supply
Hose
Kohler Co. 13 1212876-2-B

5. Install the Toilet
Position the Toilet
Carefully lower the toilet into place, making sure the water supply line and electrical cord do not
interfere with the toilet when it is in place.
Connect the water supply hose to the supply stop.
Connect the docking station power cord (if included).
Connect the optional external FM antenna (not shown) to the toilet if needed.
Connect the external speaker wires (not shown) to the toilet if external speakers are installed.
IMPORTANT! The remote control will not function when removed from the docking station until it has
charged for approximately 30 minutes. Flush the toilet manually or use the remote control while it is
attached to the docking station using the buttons on the toilet until the remote control is fully charged.
Place the remote control on the docking station.
Turn on the water supply.
Connect the power.
Check for Leaks
NOTE: Once the power is connected, the toilet will automatically enter start-up mode. This process takes
several minutes.
NOTE: If there is a failure during start-up mode, follow the directions on the remote control.
Once the start-up sequence has been completed flush the toilet using the manual buttons on the side
of the toilet.
Cap
Screw
Bushing
Wall Supply
Installation
Shown
Docking
Station
Cord
Docking
Station Cord
(if included)
FM Antenna
Connection
External
Speaker
Connections
1212876-2-B 14 Kohler Co.

Install the Toilet (cont.)
Let the toilet fully refill and check for leaks.
Secure the Toilet
Insert the bushing into the screw hole in the side of the toilet.
Insert the supplied screws into the screw holes.
NOTE: A ratchet style screwdriver is the most effective tool when tightening the screws due to their close
proximity to the floor. It is difficult to achieve enough force with a standard screwdriver. There is a greater
risk of stripping the screws when a cordless drill or other power driver is used to tighten them.
Thread each screw into the mounting blocks. Tighten the screws evenly to maintain the correct toilet
position.
Install the caps over the bushings.
Check the toilet to make sure it is level and does not rock.
Shim if necessary to level or eliminate rocking.
Kohler Co. 15 1212876-2-B

6. Install the Back Cover
NOTE: Install the cover when the water and power supply are routed through the floor. The cover is not
designed for use when the water or electrical power are connected to wall supplies.
Position the cover over the water supply and electrical supply holes.
Run the docking station cord through the slot in the cover and snap the cover into place on the
supply hose inlet.
Align the spring clip on the cover with the supply hose inlet.
NOTE: The clip will easily snap into place on the supply hose inlet. If there is significant resistance, make
sure the clip is not pushing the hose clip out of the way.
Lower the cover and snap the clip into place on the supply hose inlet.
Spring
Clip
Cover
Slot
Docking
Station Cord
Docking Station
Cord
1212876-2-B 16 Kohler Co.

7. Select the Language - K-7420 Premium Remote Control
NOTE: If this model does not include the K-7420 premium remote control, follow the set-up instructions
included with the remote control.
NOTE: If the remote control has not charged enough to be removed from the docking station, perform
these steps with the remote control attached to the docking station.
NOTE: English is the default language. Skip this step if English is the desired language.
Changing the On-Screen Language
Select [settings].
Select [system settings].
Select [languages].
NOTE: If the language you desire does not appear on the screen, move the scroll bar down to see
additional language options.
Select the radio button for your desired language. The screen icons will immediately change.
Select [home] to return to the main screen or [back] to return to the previous screen.
12:34 am
brightness
backhome
system settings
user settings
power save
set time
set date
languages
12:34 am settings
home
about
bluetooth settings
maintenance
cleaning
feature settings
system settings
12:34 am home
music
front rear dryer
heating lighting
users stop settings
cover seat close
flush-eco flush-full
12:34 am
English
Deutsch
back
languages
home
Italiano
Español
Português
Français
Kohler Co. 17 1212876-2-B

8. Set the Date and Time - K-7420 Premium Remote Control
NOTE: If this model does not include the K-7420 premium remote control, follow the set-up instructions
included with the remote control.
Set the Date
Select [settings].
Select [system settings].
Select [set date].
Use the UP and DOWN indicators to adjust the day, month, and year.
Select the desired radio button for the date format.
Select [home] to return to the main screen or [back] to return to the previous screen.
Set the Time
Select [settings].
Select [system settings].
Select [set time].
Select the radio button for the [12 hr.] or [24 hr.] option.
Use the UP and DOWN indicators to adjust the hour and minute.
Select the radio button for the [am] or [pm] option.
Select [home] to return to the main screen or [back] to return to the previous screen.
flush-fullflush-eco
close
seat
cover
settingsstopusers
lightingheating
dryer
rear
front
music
home
12:34 am
system settings
feature settings
cleaning
maintenance
bluetooth settings
about
home
settings
12:34 am
languages
set date
set time
power save
user settings
system settings
home back
brightness
12:34 am
am
pm
set time
home back
24 hr.
12 hr.
12:34
12:34 am
set date
mm/dd/yyyy
dd/mm/yyyy
yyyy/mm/dd
home back
10/12/2009
12:34 am
1212876-2-B 18 Kohler Co.

9. Connect the K-7420 Premium Remote Control
NOTE: If this model does not include the K-7420 premium remote control, follow the set-up instructions
included with the remote control.
NOTE: This setting can be used to connect a new or a second remote control.
Select [settings].
Select [maintenance].
Select [learn remote].
Follow the instructions on the remote screen. When complete select [yes].
10. Complete the Installation - All Remote Controls
Press the flush button on the remote control or on the toilet. Confirm the toilet flushes.
Remove the protective film from the toilet and remote control.
Apply caulk around the base of the toilet following the caulk manufacturer’s instructions.
12:34 am settings
home
about
bluetooth settings
maintenance
cleaning
feature settings
system settings
12:34 am home
music
front rear dryer
heating lighting
users stop settings
cover seat close
flush-eco flush-full
reset
shutdown
home
learn remote
factory menu
back
reconnect
maintenance
diagnostics
12:34 am
no
yes
home back
learn remote
12:34 am
back
key.then press
key until LED blinks,
to associate this remote:
on the desired toilet, please hold
&
Kohler Co. 19 1212876-2-B

Guide d’installation
Toilette
Informations importantes
REMARQUE: Ce produit est conçu pour l’installation avec les alimentations électriques et d’eau localisées
soit à travers le mur ou le sol.
Instructions de mise à la terre
•Ce produit doit être mis à la terre. En cas de court-circuit, la mise à la terre réduit le risque
d’électrocution en apportant un câble d’échappement pour le courant électrique. Ce produit est
équipé d’un cordon muni d’un câble de mise à la terre avec une fiche de mise à la terre. Cette fiche
doit être branchée dans une prise correctement installée et mise à la terre.
AVERTISSEMENT: Risque de choc électrique. L’utilisation incorrecte de la fiche de mise à la terre
peut résulter en électrocution.
•Si la réparation ou le remplacement de la corde ou de la fiche est nécessaire, ne pas brancher le
câble de mise à la terre au terminal à lame plate. Le câble avec isolation dont l’extérieur est vert
avec ou sans rayures jaunes est le câble de mise à la terre.
•Vérifier auprès d’un électricien qualifié ou dépanneur en cas de doute par rapport aux instructions
de mise à la terre ou à la bonne mise à la terre du produit.
•Ce produit est équipé en usine avec un cordon et une fiche électriques spécifiques pour permettre le
branchement à un circuit électrique adéquat. S’assurer que le produit est connecté à une prise de
même configuration que celle de la fiche. Aucun adaptateur ne doit être utilisé avec ce produit. Ne
pas modifier la fiche fournie — si elle ne s’adapte pas à la prise, faire installer une prise adéquate
par un électricien qualifié. Si le produit doit être rebranché pour être utilisé sur un circuit électrique
différent, le branchement doit être effectué par un personnel qualifié.
Outils et matériaux
Perceuse avec
mèches assorties
Tournevis assortis Anneau de cire
Clé à molette
Plus:
• Matériel de protection
• Ruban
• Antibélier
Tournevis coudé
Kohler Co. Français-1 1212876-2-B