TOTO Aquia IV Dual Flush Toilet Tank ST446EMNA#01 User Manual

Product Overview

The TOTO Aquia IV Dual Flush Toilet Tank (Model ST446EMNA#01) is designed for use with the TOTO Aquia IV dual flush toilet bowl. This tank features a dual-flush system, allowing users to select between two flush volumes to conserve water. It is also compatible with TOTO T40 WASHLET+ and Auto Flush systems for future upgrades.

Image: TOTO Aquia IV Dual Flush Toilet Tank in Cotton White. This image shows the exterior of the toilet tank, highlighting its clean lines and the chrome push-button flush mechanism on top.

Key Features:

• Dual Flush System: Offers 1.28 GPF (Gallons Per Flush) for standard use and 0.9 GPF for lighter flushes, promoting water conservation.
• WASHLET+ and Auto Flush Compatibility: Designed to integrate seamlessly with TOTO T40 WASHLET+ bidet seats and Auto Flush kits for enhanced hygiene and convenience.
• WaterSense Certified: Meets EPA WaterSense criteria, as well as California's CEC and CALGreen requirements for water efficiency.
• Included Components: Tank to bowl gasket, tank to bowl hardware, and toilet bolt caps are included.

Setup and Installation

This section provides general guidelines for installing the TOTO Aquia IV toilet tank. Professional installation is recommended. Ensure all local plumbing codes are followed.

Before You Begin:

• Ensure you have the compatible TOTO Aquia IV toilet bowl.
• Gather additional necessary items (purchased separately): toilet bowl, wax ring, toilet mounting bolts, and water supply lines.
• Turn off the water supply to the toilet area.

Installation Steps:

1. Prepare the Bowl: Place the toilet bowl in its intended position over the floor flange. Ensure it is level and stable.
2. Install Wax Ring: Carefully place a new wax ring onto the floor flange or the base of the toilet bowl.
3. Secure the Bowl: Lower the toilet bowl onto the wax ring and floor bolts. Press down firmly and evenly to create a seal. Secure the bowl with toilet mounting bolts and caps. Do not overtighten.
4. Attach Tank to Bowl: Position the tank to bowl gasket onto the flush valve opening on the bottom of the tank. Carefully align the tank with the bolt holes on the back of the toilet bowl.
5. Fasten Tank: Insert the tank to bowl hardware (bolts, washers, nuts) through the tank and bowl holes. Hand-tighten the nuts evenly until the tank is snug and stable. Avoid overtightening to prevent cracking.
6. Connect Water Supply: Connect the water supply line from the shut-off valve to the fill valve inlet on the bottom of the tank. Hand-tighten, then use a wrench for a final quarter-turn. Do not overtighten.
7. Check for Leaks: Turn on the water supply slowly and check all connections for leaks. Allow the tank to fill.
8. Install Tank Lid: Place the tank lid with the chrome dual flush push button onto the tank.

Operating Instructions

The TOTO Aquia IV tank features a dual flush system controlled by a chrome push button located on the tank lid.

Dual Flush Operation:

• Full Flush (1.28 GPF): Press the larger section of the chrome push button for a full flush, suitable for solid waste.
• Light Flush (0.9 GPF): Press the smaller section of the chrome push button for a light flush, suitable for liquid waste, conserving water.

WASHLET+ and Auto Flush Compatibility:

This tank is designed for compatibility with TOTO T40 WASHLET+ bidet seats and TOTO Auto Flush kits. If you are upgrading to these systems, refer to the specific installation and operation manuals provided with your WASHLET+ or Auto Flush kit for detailed instructions on integration and use.

Image: A TOTO WASHLET+ toilet bowl with a visible water stream, illustrating the advanced cleaning features. This image demonstrates the type of system the Aquia IV tank is compatible with for enhanced functionality.

Maintenance

Regular maintenance ensures optimal performance and longevity of your TOTO Aquia IV toilet tank.

Cleaning:

• Clean the exterior of the tank with a soft cloth and mild, non-abrasive cleaner.
• Avoid harsh chemicals, abrasive pads, or cleaners containing bleach, as these can damage the finish and internal components.
• For the chrome push button, wipe with a damp cloth and dry immediately to prevent water spots.

Internal Components Check:

• Periodically remove the tank lid and inspect the fill valve and flush valve for any signs of wear or damage.
• Ensure the water level is at the marked waterline inside the tank. Adjust the fill valve if necessary according to the manufacturer's instructions for the specific fill valve model.
• Check for any mineral buildup, especially in hard water areas. Clean with a vinegar solution if needed, ensuring to rinse thoroughly.

Troubleshooting

This section addresses common issues you might encounter with your toilet tank. For more complex problems, consult a qualified plumber.

Common Issues and Solutions:

• Continuous Running Water:
  • Check if the flush valve flapper/seal is properly seated.
  • Inspect the fill valve for proper operation and ensure the float cup is not obstructed.
  • Verify the water level is not too high, causing water to overflow into the overflow tube. Adjust the fill valve if needed.
• Weak Flush:
  • Ensure the water level in the tank is at the correct mark.
  • Check if the flush chain (if applicable) has enough slack to allow the flapper to open fully.
  • Inspect the rim jets under the toilet bowl rim for clogs.
• Leaks Around the Tank Base:
  • Tighten the tank-to-bowl bolts evenly, but do not overtighten.
  • Inspect the tank-to-bowl gasket for damage or improper seating. Replacement may be necessary.
  • Check the water supply line connection for tightness.

Specifications

Warranty Information

TOTO products are manufactured to high-quality standards. Specific warranty details for the Aquia IV Dual Flush Toilet Tank (ST446EMNA#01) are typically provided with the product at the time of purchase or can be found on the official TOTO website. Please retain your proof of purchase for warranty claims.

For detailed warranty terms and conditions, please visit the official TOTO USA website or contact TOTO customer service.

Customer Support

If you require assistance with installation, operation, maintenance, or troubleshooting that is not covered in this manual, please contact TOTO customer support.

• Online Resources: Visit the official TOTO USA website for FAQs, product registration, and additional support documents.
• Contact TOTO: Refer to the contact information provided on the TOTO website or in your product packaging for phone and email support.
• TOTO Store: You can also find more information and products at the TOTO Amazon Store.