KOHLER K-18829 Installation Manual

Installation and Care Guide

In-Wall Tank and Carriage

K-18829

M product numbers are for Mexico (i.e. K-12345M)
Los números de productos seguidos de
M corresponden a México (Ej.
K-12345M)
Français, page “Français-1”
Español, página “Español-1”

1246750-2-B

Tools and Materials

Assorted Drill Bits

5/8"
(16 mm)

1/2"

1/4 turn, 1/2" NPT
Supply Shut-off with
5/8" or Shorter Handle

Silicone Plumbers
Grease

1/4" x 2" (51 mm) Min
Lag Bolts

Plus:

• Conventional woodworking

tools and materials

• 1/4" x 2" (51 mm) Min
Concrete Expansion Bolts
(for concrete subflooring)

Optional:

• Assorted electrical tools

Before You Begin

IMPORTANT! 2x4 framing is required for this product.

IMPORTANT! In areas with freezing temperatures, install on an

interior wall. If installed on an exterior wall, provide adequate
insulation to prevent the possibility of freezing.

NOTE: If 2x6 framing is used, the drain outlet may be angled 45
degrees in either direction.

NOTE: This device is not intended to be used as a retrofit device
for 1.28 gpf (4.8 lpf) water closets.

NOTE: Performance may vary. This product was tested with toilets
that are listed as compatible.

Only bowl numbers K-6299 and K-6300 are compatible with the
carriage.

During installation, make sure the inlet tube connections and
gaskets remain fully engaged to ensure a watertight seal.

Carefully inspect the carriage and tank for damage.
Observe all local plumbing and building codes.

For Installations with a Bidet Seat

1246750-2-B 2 Kohler Co.

CAUTION: Risk of personal injury. If the optional electrical
outlet will be installed, it must be connected to a GFCI or
RCD protected circuit.

Before You Begin (cont.)

If the optional electrical outlet will be installed, observe all local
electrical codes.

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2x4 Studs or
2x6 Studs

PVC
Elbow

1-3/4" (44 mm) [2x4 Studs]
3-1/4" (83 mm) [2x6 Studs]

Waste
Outlet
Pipe

23-1/4"
(591 mm)

1-3/4" (44 mm) [2x4 Studs]
3-1/4" (83 mm) [2x6 Studs]

8" (203 mm) [Plywood Subfloor]
9-1/8" (232 mm) [Concrete Subfloor]

1. Install the Framing

IMPORTANT! Note the 1-3/4″ (44 mm) or 3-1/4″ (83 mm)
dimension from the front edge of the framing to the center of the
outlet pipe depending on your installation. This dimension is critical
for the installation.

NOTE: Refer to the specification sheet for more details and
dimensions for roughing-in.

NOTE: The waste outlet pipe may need to be relocated for this
installation.

NOTE: A PVC elbow is supplied with this product. A cast iron
elbow may be required by codes in some areas. The height of the
toilet drain pipe may need to be adjusted if the cast iron elbow is
used.

NOTE: Double studs must be used on either side of the stud
pocket.

Construct the stud pocket using the dimensions shown.

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Install the Framing (cont.)

The center of the waste outlet should be 1-3/4″ (44 mm) or 3-1/4″
(83 mm) from the front edge of the framing.

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Mounting

Front View

Frame

PVC
Elbow

Drain
Clamp

Electrical
Box

2. Prepare the Carriage

Install the Drain Clamp

Unpack and inspect the carriage.

Back View

NOTE: If using 2x6 studs, install the mounting frame reversed into
the back notches.

Install the mounting frame into the front notches on the bottom
of the carriage.

Insert the PVC elbow into the mounting frame.
Secure the elbow in place with the drain clamp. Push the clamp

into the frame until it locks into place.

Install the Electrical Box - Bidet Installations

NOTE: The 1201721 electrical box kit is required when the K-4744
bidet seat will be paired with the bowl. Skip this step for standard
installations.

Connect the electrical box to the carriage at the location shown.

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Mark the carriage.

2-5/8"
(67 mm)

A

Threaded
Rods

Finished
Floor

Nut

Leg

3. Adjust the Carriage Height

IMPORTANT! If the carriage is not correctly adjusted, the bowl rim
height may not be compliant with applicable codes. The finished
wall would need to be removed to make the correct adjustments if
the bowl height is not correct.

NOTE: For the K-6299 and K-6300 bowls, the minimum rim height
is 15″ (381 mm) when the finished floor is even with the bottom of
the carriage legs. The maximum rim height is 23″ (584 mm) when
the legs are fully raised. The carriage can be adjusted up to 8″ (203
mm), with 6″ (152 mm) or less of adjustment sufficient in most
installations.

Move the carriage into place in the stud pocket.
Temporarily secure the carriage in place so it will not fall.
Install the threaded rods several turns into the carriage.
Make a mark on the carriage 2-5/8″ (67 mm) above the top of the

threaded rod.
Measure from the finished floor to the mark (A) to determine the

rim height of the bowl.

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Adjust the Carriage Height (cont.)

Loosen the nuts securing the legs to the carriage.

NOTE: As the carriage is lowered, make sure the elbow aligns with
the toilet drain pipe.

NOTE: If applicable, confirm the gasket on the elbow stays
correctly positioned as it enters the toilet drain pipe.

Adjust the carriage until the desired height is reached. Securely
tighten the nuts using a wrench to secure the legs in place.

NOTE: If a cast iron elbow is required, make the connections
following all applicable codes.

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Lag Bolts

4. Install the Carriage

Align the carriage flush with the front edge of the studs. The
front of the carriage should be flush with the front edge of the
studs or set back slightly for finished wall installation.

Check the front of the carriage for plumb.
Mark the hole locations for the six lag bolts, one for each foot and

two on either side of the carriage.
Drill pilot holes (remove the carriage if needed) to reduce the risk

of the lag bolts causing the studs to split or crack.

NOTE: If the carriage is installed onto a concrete sub-floor use
concrete expansion bolts (not supplied) when securing the feet of
the carriage.

Secure the carriage to the support studs using 2″ (51 mm) long
(minimum) lag bolts (not supplied), one at each location.

Connect the Power - Bidet Seat Installations

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WARNING: Risk of personal injury. Disconnect the power
before connecting the wires.

Install the Carriage (cont.)

CAUTION: Risk of personal injury. The electrical outlet
must be connected to a GFCI or RCD protected circuit or an
accessible Ground-Fault Circuit-Interrupter (GFCI) or
Residual-Current Device (RCD) must be installed.

NOTE: This step is only needed if the electrical box was installed in
the ″Prepare the Carriage″ section.

Connect the power following all applicable codes.

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Bidet Water Supply
(Optional)

5. Install the Water Supply

All Installations

1/2" NTP
Adapter

4" (102 mm)
Maximum Clearance
from the Front of
the Finished Wall

5/8"
(16 mm)
Max

IMPORTANT! Optional bidet water supply is shown. Do not install
a second water supply unless a bidet seat will be installed.

Install the water supply pipes, following all local codes.
Connect the waste pipe following all applicable local codes.
If using a G 1/2 connection, remove the 1/2″ NTP adapter and

discard.

Installations With a Bidet Seat

Optional: Install the bidet water supply and a quarter turn, 1/2″
NPT supply shut-off.

IMPORTANT! The bidet supply shut-off must extend 3″ (76 mm)
minimum to 4″ (102 mm) maximum from the finished wall to allow
access to the handle. The supply shut-off handle should be no
higher than 5/8″ (16 mm) from the center of the water supply.

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Inlet
Hole

Flush Shield

Outlet
Hole

Plaster Guard

6. Install the Plaster Guards

Insert a plaster guard into the inlet hole in the carriage.
Install a plaster guard into the outlet hole in the carriage.
Install the flush shield in the flush valve opening by snapping it

into place.

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Finished Wall

Front View

10-1/2" (267 mm)

9-1/4"
(235 mm)

8" (203 mm)

7. Install the Finished Wall

NOTE: It is recommended to use cement board or tile backer board
for the wallboard backing. Gypsum board can also be used but it
may affect the toilet loading strength.

NOTE: The wall thickness should not exceed 2-3/4″ (70 mm).

Install the finished wall.

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Utility Knife

Finished Wall

Flush Shield

8. Trim the Flush Shield

Use a utility knife to carefully trim the flush shield even with the
finished wall.

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Flush Valve Opening

Service Cover
Tabs

9. Remove the Service Cover

Remove and discard the service cover by pressing down on the
tabs and pulling forward.

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Push Rod
Nuts

Side View

1/2"
(13 mm)
Min

Push Rods

Finished
Wall

10. Install the Actuator

Thread the push rods into the actuator assembly 1/2″ (13 mm)
behind the finished wall.

If needed, trim the threaded end of the push rods.
Secure the push rods in place with the push rod nuts.

K-4177, K-8857 and K-5413

Thread the push rods into the actuator assembly flush with the
finished wall.

If needed, trim the threaded end of the push rods.
Secure the push rods in place with the push rod nuts.

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Mounting Frame

Faceplate

Open Position

Lock Position

Finished
Wall

11. Install the Faceplate

Install the locking pins into the mounting frame.
Turn the locking pins to the ″Open″ position.
Align the mounting frame with the tank mounting opening and

install the frame.
If needed, trim the locking pins.
Turn the locking pins to the ″Lock″ position.
Position the faceplate over the lift rod assembly and press into

place.

Care and Cleaning

WARNING: Risk of property or product damage. Do not
use in-tank cleaners in your toilet. Products containing
chlorine (calcium hypochlorite) can seriously damage fittings
in the tank. This damage can cause leakage and property
damage.

Kohler Co. shall not be responsible or liable for any tank fitting

Kohler Co. 17 1246750-2-B

Care and Cleaning (cont.)

damage caused by the use of cleaners containing chlorine (calcium
hypochlorite).

For best results, keep the following in mind when caring for your
KOHLER product:

•

Always test your cleaning solution on an inconspicuous area
before applying to the entire surface.

•

Wipe surfaces clean and rinse completely with water immediately
after applying cleaner. Rinse and dry any overspray that lands on
nearby surfaces.

•

Do not allow cleaners to soak on surfaces.

•

Use a soft, dampened sponge or cloth. Never use an abrasive
material such as a brush or scouring pad to clean surfaces.

•

For Artist Edition Toilets: Treat your decorative product just as
you would treat your fine china. DO NOT use bristle brushes or
abrasive-backed sponges. They will scratch decorative surfaces.
Use only warm water to clean. Dry with a cotton cloth or soft
sponge.

For detailed cleaning information and products to consider, visit
www.kohler.com/clean. To order Care & Cleaning information, call
1-800-456-4537.

Troubleshooting

For service parts information, visit www.kohler.com/serviceparts.

Symptoms Cause Recommended Action

1. Poor flush. A. Water level is

too low.

B. Improper waste

line venting.

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A. The water line should

be about 8″ (203 mm)
above the bottom of
the tank. Raise the
water level in the tank
to the marked
waterline by turning
the white knob
clockwise until the
water level reaches the
waterline marked in
the tank.

B. Install venting to code.

Troubleshooting (cont.)

Symptoms Cause Recommended Action

2. Running fill

valve.

A. Water level is

too high.

A. Lower the water level

in the tank by turning
the knob at the top of
the threaded rod
counterclockwise until
the fill valve shuts off
when the water level
reaches the marked
waterline in the tank.

B. Flush valve

gasket or flush
valve are

B. Replace gasket or

flush valve as
necessary.

damaged.

C. Flush valve is

sticking open.

C. Check flush valve and

actuating mechanisms
for free movement.
Push button actuators
should raise levers
then spring back
without force. Replace
components as
necessary.

3. Leaks from

behind the bowl.

A. Gaskets not

positioned
correctly.

A. Remove the bowl and

inspect all the gaskets.
Reposition the gaskets
if needed. Lubricate
the gaskets so they
slide over the mating
part they seal.
Reinstall the bowl,
making sure the
gaskets stay in the
correct positions.

4. Carriage and

bowl flex when
used.

A. Insufficient

support for
frame.

A. Add additional

support members, and
mount the frame with
1/4″ or larger lag
screws.

5. No water flow. A. Supply stop

located in tank
is closed.

A. Open the supply stop

(located on the left
side).

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Troubleshooting (cont.)

Symptoms Cause Recommended Action

B. There is an

obstruction in
the water line.

B. Close the external

supply stop,
disconnect the braided
hose where it attaches
to the fill valve. Turn
on the water supply
and check the flow
through the hose.
Continue to
investigate water path
for obstructions. Clear
any blockages.

Warranty

ONE-YEAR LIMITED WARRANTY

KOHLER plumbing products are warranted to be free of defects in
material and workmanship for one year from date of installation.

Kohler Co. will, at its election, repair, replace or make appropriate
adjustment where Kohler Co. inspection discloses any such defects
occurring in normal usage within one (1) year after installation. Kohler
Co. is not responsible for removal or installation costs. Use of in-tank

toilet cleaners will void the warranty.

To obtain warranty service contact Kohler Co. either through your
Dealer, Plumbing Contractor, Home Center or E-tailer, or by writing
Kohler Co., Attn.: Customer Care Center, 444 Highland Drive, Kohler,
WI 53044, USA, or by calling 1-800-4-KOHLER (1-800-456-4537) from
within the USA and Canada, and 001-800-456-4537 from within Mexico,
or visit www.kohler.com within the USA, www.ca.kohler.com from
within Canada, or www.mx.kohler.com in Mexico.

IMPLIED WARRANTIES INCLUDING THAT OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE EXPRESSLY LIMITED IN DURATION TO THE
DURATION OF THIS WARRANTY. KOHLER CO. AND/OR
SELLER DISCLAIM ANY LIABILITY FOR SPECIAL, INCIDENTAL
OR CONSEQUENTIAL DAMAGES. Some states/provinces do not

allow limitations on how long an implied warranty lasts, or the
exclusion or limitation of special, incidental or consequential damages,
so these limitations and exclusions may not apply to you. This
warranty gives you specific legal rights. You may also have other
rights which vary from state/province to state/province.

1246750-2-B 20 Kohler Co.

Warranty (cont.)

This is Kohler Co.’s exclusive written warranty.

Kohler Co. 21 1246750-2-B