TOTO CST646F Dual Flush Toilet Owner’s Manual

: June 3, 2024
: TOTO

Table of Contents

THANKS FOR CHOOSING TOTO!
INCLUDED PARTS
COMMON TOOLS NEEDED
BEFORE INSTALLATION
CARE AND CLEANING
INSTALLATION PROCEDURE
REPLACING THE FILL VALVE
ADJUSTING THE WATER LEVEL
SERVICING THE FILL VALVE
CEFIONTECT® MAINTENANCE INSTRUCTIONS
WARRANTY
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Installation and Owner’s Manual
Dual-ﬂush Toilet

CST646F

Warranty Registration and Inquiry For product warranty registration, TOTO U.S.A. Inc. recommends online warranty registration. Please visit our web site http://www.totousa.com. If you have questions regarding warranty policy or coverage, please contact TOTO U.S.A. Inc., Customer Service Department, 1155 Southern Road, Morrow, GA 30260 888-295-8134 or 678-466-1300 when calling from outside of U.S.A.

THANKS FOR CHOOSING TOTO!

The mission of TOTO is to provide the world with healthy, hygienic, and more comfortable lifestyles. We design every product with the balance of form and function as a guiding principle. Congratulations on your choice.

INCLUDED PARTS

Check to make sure you have the following parts included in your package*:

Actual parts may appear different from drawing according to the model.

COMMON TOOLS NEEDED

• 10” adjustable wrench
• Carpenters’ level
• Hacksaw
• Tape measure
• Hand pliers
• Flat head screwdriver
• Phillips screwdriver| • Pencil
Putty knife
Drill
Drill bits (mounting block)
For wood ﬂoor installation: – ⅛ ” drill bit
For concrete/tile installation: – ⁵/¹⁶ ” drill bit
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MATERIALS REQUIRED:

(Not Included)
• Flexible supply hose
• Angle stop valve
• Wax ring

BEFORE INSTALLATION

Read these instructions thoroughly before beginning work.
Please leave instructions for customers. These instructions contain maintenance and warranty information.
If necessary, remove the existing toilet, and if new construction, purge the supply line.

NOTICE
Due to the powerful performance of our Tornado, G-Max, E-Max, and Power Gravity ﬂushing systems, they are not speciﬁed for back-to-back installations. The only means of installing these toilets in a back-to-back situation is when the toilet drain connections incorporate a WYE ﬁtting. Please contact your builder or contractor prior to this installation.

Water supply shut-off valve installation recommendations

Follow these recommendations to ensure an optimal and trouble-free installation with a neat and professional appearance.
Location
(From floor and left of center of floor flange)| 4-3/4″ x 5-1/8″ (120mm x 150mm)
Valve type| Angle stop type valve with supply connection facing upward, inward, or downward
NOTE: Straight stop type valve, or valve with supply connection on front of angle stop, is not recommended
Maximum length| Angle stop must protrude less than 3″ (80mm) from wall

CARE AND CLEANING

Use a detergent or non abrasive toilet cleaner and a soft-bristled plastic brush to clean your toilet. To remove hard water stains, use vinegar or lime dissolving cleaner and a non scratch scour pad made for porcelain. Allow a little contact time to allow the cleaner to dissovle the buildup. Do not spray cleaner directly onto the button, instead wipe it using a dampened soft cloth with diluted dishwashing detergent and dry it with another soft cloth.
Do not spray cleaner directly onto the button, instead wipe it using a dampened soft cloth with diluted dishwashing detergent and dry it with another soft cloth. Do not use bleach or products that contain acid or alkaline detergents in their ingredients. Do not use metal scrub brushes or steel wool.

NOTICE
DO NOT USE IN-TANK BOWL CLEANERS.
The use of high concentrations of chlorine or chlorine-related products can seriously damage ﬁttings in the tank. This damage can cause leakage and property damage. TOTO® shall not be responsible or liable for any tank ﬁtting failure or damage caused by the use of in-tank bowl cleaners.

INSTALLATION PROCEDURE

Open the Uniﬁt Rough-In packaging. Follow the Uniﬁt Rough-In Installation instruction to complete the rough-in installation (ill. 1).
Place the template into position and follow its instructions to prepare for installing the toilet.
NOTICE Do not move the Uniﬁt Rough-In on the Floor Flange after wax seal is set. If this notice is disregarded, discard the wax ring and replace with new wax ring.
Place the toilet over the Uniﬁt Rough-In and the two mounting blocks, by aligning the toilet outlet with the Uniﬁt Rough-In opening (ill. 2).
NOTICE Insert the toilet all the way into position. If this notice is disregarded, leakage may result. Check for rocking. If needed, use shims to
NOTICE prevent the toilet from rocking.
Align the toilet perpendicular to the back wall and parallel to side walls; it should not sit crooked or diagonal (ill. 3).
Install the side screws to the mounting blocks. Cover the screw head with the provided screw caps (ill. 4).
Connect the water supply hose (not provided) to the ﬁll valve (ill. 5).
Install the ﬂexible water supply hose to the angle stop (ill. 5). Make sure that
the hose is free of kinks.
On the underside of the tank lid , remove the 2 rods with lock nuts, and screw them clockwise to the push button assembly.
Place the lid on top of the tank, making sure that the full flush push button is on the left side (ill 6).
Adjust the length of the rods. If the push button rods are too short (see ill. 7a), the push buttons will not sit properly and toilet may short flush. If the push button rods are too long (see ill. 7b), the push button may continuously activate the flush valve. Correct with the following steps:
Loosen the lock nuts counter-clockwise.
Turn the rods clockwise to shorten, counterclockwise to lengthen (each full turn is 1mm).
Place the lid on the tank to check the adjustment.
When the adjustment is completed, tighten the lock nut to secure.
Turn on the water supply at the angle stop.
Check ALL connections for leaks. Fix as needed.
The toilet seat is installed with the seat top mounting hardware. Refer to the seat installation instruction.

REPLACING THE FILL VALVE

Shut off the water supply. Flush the toilet and remove any remaining water from the tank. Reverse the tank installation instructions to remove it from the bowl. Remove the old ﬁll valve.
Install new ﬁll valve by sliding the threaded portion of the shaft through the hole in the bottom of tank.
Thread mounting nut onto exposed shaft under the tank and tighten nut.
CAUTION Do not over-tighten.
Connect the water supply (see ill. 8). Pipe dope is not recommended.
Attach the reﬁll tube to the valve and clip the other end to the overﬂow pipe.

ADJUSTING THE WATER LEVEL

Refer to the water level line stamp inside the tank.

The water level adjustment is located in the top end of the ﬁll valve.
Use a ﬂathead screwdriver to make adjustments:
• To raise the water level: turn the screwdriver clockwise, or towards the ‘+’ indicator.
• To lower the water level: turn the screwdriver counter-clockwise, or towards the ‘-’ indicator.
Flush after each adjustment to check the water level. When satisﬁed with the water level, ﬂush once more to verify.

SERVICING THE FILL VALVE

NOTE: Due to water conditions in your area, the strainer may require periodic cleaning. An indication that the strainer requires service can be seen in a delayed ﬁll cycle, intermittent ﬁll cycle, or inadequate amount of water ﬂow from the reﬁll tube.

Snap off the top cover by pulling from under the tab (see ill. 1).
Pinch the tabs of the lever arm to allow its removal (see ill. 2).
Snap off the adjustable rod from the bracket (1) allowing the unit to slide to the bottom and remove the retainer tab by pulling as the arrow
indicates (3) (see ill. 3).
Grab hold of the valve unit, twist 1/4 turn counterclockwise and pull the unit out (see ill. 4).
Unscrew nut of the diaphragm housing (see ill. 5).
Remove the diaphragm from its housing by carefully pulling the edge of the diaphragm (see ill. 6). Note the position of the diaphragm while
removing.
Remove the strainer from the tube with needle nose pliers (see ill. 7). Use twisting motion while pulling to help with removal.
Rinse all parts under running water to clear any debris, residues or ﬁlms. Reinstall all parts in reverse order. Turn the water ON and check for leaks
and operation.
Turn off water supply and ﬂush the toilet.
Remove the tank lid and place it upside down on a clean surface.
Note the orientation of the ﬂush valve for reassembly.
Turn the upper half of ﬂush valve counter-clockwise and pull it up to remove it (see ill. 1).
Remove the rubber seal gasket and rinse under running water to clean (see ill. 2).
Place the gasket back on the ﬂush valve (see ill. 3).
Install the ﬂush valve back on the base.
Rotate the ﬂush valve so that the partial ﬂush button is on the right and the full ﬂush button is on the left.
Carefully, install the tank lid back on the tank.
Flush the toilet several times using each push button to verify proper operation. Check for leakage.

CEFIONTECT® MAINTENANCE INSTRUCTIONS

WHAT IS CEFIONTECT®?
CEFIONTECT® is TOTO’s super-smooth permanent glaze that prevents debris from sticking to surfaces. Products with the letter “G” in the number have the
CEFIONTECT® glaze. This glaze, along with regular cleaning, will help keep your TOTO product in pristine condition.

NOTE:
For best results to keep your Toto product with CEFIONTECT® clean:

Lavatory: Use a mild dish detergent with a clean, soft cloth.
Toilet: Use a gel-based cleaner with a soft bristled-plastic brush.
Don’t use cleaners, polishing powders, or detergents that have gritty or coarse particles.
Don’t use bleach, chemical thinners, or products that have acid or alkaline detergents listed as ingredients.
Don’t use metal scrub brushes or steel wool.

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Following these instructions will ensure that your TOTO product with the CEFIONTECT® glaze will always stay intact, keeping your product like new for years to come!

WARRANTY

TOTO® warrants its vitreous china products (“Product”) to be free from defects in materials and workmanship during normal use when properly installed and serviced, for one (1) year from the date of purchase. This limited warranty is extended only to the ORIGINAL PURCHASER of the Product and is not transferable to any third party, including but not limited to any subsequent purchaser or owner of the Product. This warranty applies only to TOTO Products purchased and installed in North, Central, and South America.
TOTO’s obligations under this warranty are limited to repair, replacement, or other appropriate adjustments, at TOTO’s option, of the Product or parts found to be defective in normal use, provided that such Product was properly installed, used, and serviced by instructions. TOTO reserves the right to make such inspections as may be neces sary to determine the cause of the defect. TOTO will not charge for labor or parts in connection with warranty re-pairs or replacements. TOTO is not responsible for the cost of removal, return, and/or reinstallation of the Product.
This warranty does not apply to the following items:
a.Damage or loss resulting from any accident, unreasonable use, misuse, abuse, negligence, or improper
b. Damage or loss sustained in a natural calamity such as fire, earthquake, flood, thunder, electrical storm, etc. – care, cleaning, or maintenance of the Product.
c. Damage or loss resulting from sediments or foreign matter contained in a water system.
d. Damage or loss resulting from improper installation or installation of the Product in a harsh and/or hazardous environment, or improper removal, repair, or modification of the Product. (NOTE: Product model codes – allow a maximum of 80 PSI. Check local codes or standards for requirements).
e. Damage or loss resulting from electrical surges or lightning strikes or other acts which are not the fault of TOTO or which the Product is not specified to tolerate.
f. Damage or loss resulting from normal wear and tear, such as gloss reduction, scratching, or fading over time due to use, cleaning practices, or water or atmospheric conditions.
h. Tank flushing mechanisms of plastic or rubber moving parts.
h. Toilet seats of plastic, wood, or metal.
For this limited warranty to be valid, proof of purchase is required. TOTO encourages warranty registration upon purchase to create a record of Product ownership at http://www.totousa.com. Product registration is completely voluntary and failure to register will not diminish your limited warranty rights.
THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS. YOU MAY HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE, PROVINCE TO PROVINCE, OR COUNTRY TO COUNTRY.
To obtain warranty repair service under this warranty, you must take the Product or deliver it prepaid to a TOTO service facility together with proof of purchase (original sales receipt) and a letter stating the problem, or contact a TOTO distributor or products service contractor, or write directly to TOTO U.S.A., INC., 1155 Southern Road, Morrow, GA 30260 678-466-1300 or 888-295-8134, if outside the U.S.A. If, because of the size of the Product or nature of the defect, the Product cannot be returned to TOTO, receipt by TOTO of written notice of the defect together with proof of purchase (original sales receipt) shall constitute delivery. In such a case, TOTO may choose to repair the Product at the purchaser’s location or pay to transport the Product to a service facility.

WARNING! TOTO shall not be responsible or liable for any failure of, or damage to, this Product caused by either chloramine in the treatment of public water supply or cleaners containing chlorine (calcium hypochlorite).
NOTE: The use of high-concentrate chlorine or chlorine-related products can seriously damage the fittings. This damage can cause leakage and serious property damage.

THIS WRITTEN WARRANTY IS THE ONLY WARRANTY MADE BY TOTO. REPAIR, REPLACEMENT OR OTHER APPROPRIATE ADJUSTMENT AS PROVIDED UNDER THIS WARRANTY SHALL BE THE EXCLUSIVE REMEDY AVAILABLE TO THE ORIGINAL PURCHASER. TOTO SHALL NOT BE RESPONSIBLE FOR LOSS OF THE PRODUCT OR OTHER INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR EXPENSES INCURRED BY THE ORIGINAL PURCHASER, OR FOR LABOR OR OTHER COSTS DUE TO INSTALLATION OR REMOVAL, OR COSTS OF REPAIRS BY OTHERS, OR ANY OTHER EXPENSE NOT SPECIFICALLY STATED ABOVE. IN NO EVENT WILL TOTO’S RESPONSIBILITY EXCEED THE PURCHASE PRICE OF THE PRODUCT. EXCEPT TO THE EXTENT PROHIBITED BY APPLICABLE LAW, ANY IMPLIED WARRANTIES, INCLUDING THAT OF MERCHANTABILITY OR FITNESS FOR USE OR A PARTICULAR PURPOSE, ARE EXPRESSLY DISCLAIMED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION AND EXCLUSION MAY NOT APPLY TO YOU.

TOTO U.S.A., Inc. 1155 Southern Road, Morrow, Georgia 30260
Tel: 888-295-8134
Fax: 800-699-4889
www.totousa.com
0GU180 – 3
Rev Date: 01/22

Warranty Registration and Inquiry
For product warranty registration, TOTO U.S.A. Inc. recommends online warranty registration. Please visit our web site http://www.totousa.com. If you have questions regarding warranty policy or coverage, please contact TOTO U.S.A. Inc., Customer Service Department, 1155 Southern Road, Morrow, GA 30260 888-295-8134 or 678-466-1300 when calling from outside of U.S.A.