Kohler K-3378-EB, K-3385-EB, K-3402-EB User Manual
INTRODUCTION
This service instruction will help you understand the opera
tion and repair of Kohler low profile onepiece toilets.
The following models are included in these instructions:
K-3378-EB PILLOW TALK K-3383-EB PALARRE
K-3385-EB ROCHELLE K-3397-EB SAN RAPHAEL
K-3402-EB RIALTO K-3408-EB CABERNET
THEORY OF OPERATION
Consider how a low profile, onepiece toilet differs from the
closecoupled toilet. All the water in a close coupled toilet is
held in a tank that is above the rim of the bowl. Water to the
rim and jet is supplied by gravity.
SIPHON VORTEX LOW
PROFILE ONE-PIECE
TOILETS
On the other hand, a onepiece toilet holds all the tank
water below the rim of the bowl as shown in Fig. #1.
Fig. #1
When the trip lever is actuated, water enters the supply
valve and flows to the diverter valve. At this point all line
water is diverted to the rim. The tank water is only used to
start the water action in the bowl, and to direct water to the
upleg of the trapway to start the siphonic action as illus
trated in Fig. #2.
Fig. #2
After the flush is completed, the diverter valve directs water
to the rim for bowl refill, and to the tank for tank refill.
Since water which only will be directed to the jet is stored in
the tank, sufficient water to the rim must be supplied by the
supply valve as shown in Fig. #3.
Fig. #3
106423-0290
OF OUTLET
I.P.S. SUPPLY
I.P.S. SUPPLY
K-3378-EB Pillow Talk
Fig. #4
OF OUTLET
K-3383-EB Palarre
Fig. #5
I.P.S. SUPPLY
K-3397-EB San Raphael
Fig. #7
OF OUTLET
K-3402-PB Rialto
Fig. #8
I.P.S.
SUPPLY
OF OUTLET
K-3385-EB Rochelle
Fig. #6
I.P.S. SUPPLY
K-3408-EB Cabernet
Fig. #9
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ROUGHINGIN AND INSTALLATION
CONSIDERATIONS
Kohler low profile, onepiece toilets are perfect for remodel
ing and new installations. Refer to the roughingin draw
ings Figs. #4 - #9.
Always refer to your local codes and the installation in
structions packed with the toilet.
KOHLER LOW PROFILE ONEPIECE TOILET
FEATURES
Onepiece design offers contemporary styling.
Elongated bowl offers a large water area for efficient
waste removal.
Nonoverflow design prevents the bowl from overflowing
if the toilet becomes clogged.
Adjusting the Float Valve
Fig. #10
Tank Water Level
Screw
Timing Screw
Slotted screw on
newer models
Seal Screw
Rialto, San Raphael, Cabernet, and Pillow Talk toilets
flush with 3.5 gallons of water for greater economy.
TwistLock flush valves on new Rialto, San Raphael,
Cabernet, and Pillow Talk toilets offer ease of replace
ment with no tools.
Siphon vortex action provides excellent flush and quiet
operation.
Large water area in bowl aids in effective waste removal.
STARTUP AND OPERATION FOR RIALTO,
SAN RAPHAEL, CABERNET, AND PILLOW
TALK TOILETS
For most satisfactory operation of this toilet, 25 to 90 psi
working pressure is required at the fixture. A full 1/2" sup
ply stop (K-7653) is recommended. A plastic nut is pro
vided with the toilet and must be used to make the supply
connection to the toilet.
1. Water Level Adjustment: Refer to Fig. #10. Turn on
the water supply to the toilet and adjust the water level
in the tank to the Water Line mark on flush valve. To
raise the water level, turn the tank water level on float
valve counterclockwise. To lower the water level, turn
the screw clockwise.
below seal height, turn the seal screw clockwise,
reflush the toilet and recheck the water level. Continue
adjustment until water stops entering the bowl just as
the seal height is reached.
If water continues to flow (in bowl) after water level
reaches seal height, turn seal screw counterclockwise
and reflush toilet. Continue adjustment until water
stops entering the bowl just as the seal height is
reached.
3. High Water Pressure Timing: Note: If toilet is installed
in an area with high water pressure (above 50 psi work
ing pressure), the float valve should be timed. To time
the float valve hold the float rod and flush the toilet. After
the toilet has completed the flush, time the refill from re
lease of rod to valve shut-off.
For K-3397-EB San Raphael, K-3378-EB Pillow
Talk, and K-3408-EB Cabernet. If the time is longer than
34 seconds, no adjustment is required. If time is under 34
seconds, turn timing screw clockwise and recheck timing.
Adjust timing screw until time is between 34 and 36 sec
onds. After timing the valve, recheck the bowl water level as
in step #2, to ensure that seal is maintained.
2. Bowl Water Level Adjustment: Use the trip chain to lift
the flush ball in the tank slightly, to allow water to trickle
into the bowl until the water level in the bowl stops ris
ing. This is the "seal height" and should be noted for
subsequent adjustment. Flush the toilet and observe
the water level in the bowl after refill. If the water level is
For K-3402-PB Rialto. If the time is longer than 26 sec
onds, no adjustment is required. If time is under 26 sec
onds, turn timing screw clockwise and recheck timing. Ad
just timing screw until time is between 26 and 28 seconds.
After timing the valve, recheck the bowl water level as in
step #2, to ensure that seal is maintained.
- 3 -
HOW TO REPAIR THE RIALTO, SAN RAPHAEL,
CABERNET, AND PILLOW TALK FLOAT AND
FLUSH VALVE.
INTRODUCTION
The following instructions are used to replace the plunger
assembly on the flush valve for the San Raphael, Rialto,
Cabernet, and Pillow Talk toilets. Refer to Fig.
#11.
Screws
Cap Top
Cap
Rim Diverter
Float
Float Rod
O-ring
Plunger Ass'y
Float Ball
Gasket
Nut
Supply Hardware
Rim Tube
Float Valve Assembly
Fig. #11
1. Loosen the screws and remove the cap top and cap.
2. Replace the Oring and plunger assembly.
3. Place the cap and cap top back on valve. Tighten with
screws.
Trip Chain
Flapper Hooks
Gasket
Flush Ball
Twist Lock Flush Valve
Fig. #12
REPLACING THE OLD STYLE FLUSH VALVE
(RIALTO AND SAN RAPHAEL ONLY)
1. Refer to Fig. #13. Loosen three screws and turn
mounting hooks inward. Remove flush valve.
2. Assemble gasket to new flush valve. Position new flush
valve with three screws and mounting hooks into hole
in tank. Make sure mounting hooks are turned inward.
Turn mounting hooks outward and tighten screws.
NOTE: TOILETS WITH OLD STYLE FLUSH VALVES CAN
NOT BE FITTED WITH THE NEW TWISTLOCK VALVE.
REPLACING THE TWIST-LOCK FLUSH VALVE
1. Refer to Fig. #12. Turn valve counterclockwise and re
move.
2. To install new valve, apply a bead of silicone to the base
of the gasket. Insert into hole inside tank. Press down
and turn clockwise until valve is in proper position.
STARTUP AND OPERATION FOR ROCHELLE
& PALARRE TOILETS
The trip lever assembly actuates the rotor and flush ball to
begin flush.
The float valve assembly controls the flow of water through
the rotor to the rim holes and tank. The adjusting screw
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