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.