1. Introduction
Thank you for choosing the Daitsu ADDP-20 Digital Dehumidifier. This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your appliance. Please read it thoroughly before use and retain it for future reference.
The Daitsu ADDP-20 is designed to reduce excess humidity in indoor environments, helping to prevent mold, mildew, and other moisture-related issues. It features a 20-liter per day extraction capacity and is suitable for areas up to 52 square meters.
2. Important Safety Instructions
To reduce the risk of fire, electric shock, or injury when using your dehumidifier, follow these basic precautions:
- Read all instructions before using the appliance.
- Connect to a properly grounded outlet only.
- Do not operate the dehumidifier with a damaged power cord or plug.
- Ensure the appliance is placed on a stable, level surface to prevent tipping.
- Do not block air inlets or outlets. Maintain at least 20 cm (8 inches) clearance around the unit.
- Never insert objects into the air vents or openings.
- Do not use the appliance near water or in excessively wet environments.
- Always unplug the dehumidifier before cleaning, servicing, or moving it.
- Keep children and pets away from the appliance during operation.
- Do not attempt to repair or modify the unit yourself. Contact qualified service personnel.
3. Product Components
Familiarize yourself with the main parts of your Daitsu ADDP-20 dehumidifier:

Image 1: Front view of the Daitsu ADDP-20 Digital Dehumidifier. The unit is white with a control panel on top, a visible water tank at the bottom front, and integrated handles on the sides.
- Control Panel: Located on the top surface, featuring buttons for power, mode selection, fan speed, timer, and humidity settings.
- Air Outlet: Located at the top, where dry air is expelled.
- Air Inlet & Filter: Located at the rear, where humid air is drawn in. The air filter is behind this grille.
- Water Tank: Removable tank at the bottom front for collecting condensed water. It has a transparent window to monitor water level.
- Continuous Drainage Outlet: Located at the rear, for connecting a drain hose for continuous water removal.
- Casters (Wheels): For easy movement of the unit.
- Integrated Handles: For lifting and carrying the unit.
4. Setup Guide
- Unpacking: Carefully remove the dehumidifier from its packaging. Retain the packaging materials for future storage or transport.
- Placement: Place the unit upright on a firm, level surface in the area where dehumidification is desired. Ensure there is at least 20 cm (8 inches) of clear space around all sides of the unit for proper airflow. Do not place it against a wall or near heat sources.
- Power Connection: Ensure the power cord is securely plugged into a grounded electrical outlet with the correct voltage (refer to specifications).
- Water Tank: Ensure the water tank is correctly inserted into the unit. If you plan to use continuous drainage, connect a suitable hose to the continuous drainage outlet at the rear of the unit.
5. Operating Instructions
5.1 Control Panel Overview
The control panel typically includes the following buttons and indicators:
- Power Button: Turns the unit on or off.
- Mode Button: Selects operating modes (e.g., Auto, Continuous, Laundry Dry).
- Humidity Setting Buttons (Up/Down): Adjusts the desired humidity level.
- Fan Speed Button: Selects fan speed (e.g., Low, High).
- Timer Button: Sets the auto-on or auto-off timer.
- Display Screen: Shows current humidity, set humidity, or timer settings.
- Water Full Indicator: Illuminates when the water tank is full and needs emptying.
5.2 Basic Operation
- Power On: Press the Power button to turn on the dehumidifier. The display will show the current room humidity.
- Set Desired Humidity: Use the Up/Down buttons to set your desired humidity level (e.g., 40% - 60% relative humidity is generally recommended). The unit will operate until this level is reached, then cycle on and off to maintain it.
- Select Mode: Press the Mode button to cycle through available operating modes:
- Auto Mode: The unit automatically adjusts operation based on the ambient humidity to maintain a comfortable level.
- Continuous Mode: The unit runs continuously regardless of the humidity level, ideal for very damp conditions or for use with continuous drainage.
- Laundry Dry Mode: Optimized for drying clothes, providing continuous powerful dehumidification.
- Adjust Fan Speed: Press the Fan Speed button to select between low or high fan settings.
- Timer Function: Press the Timer button to set an auto-off timer (e.g., 2, 4, 8 hours) or an auto-on timer.
- Water Tank Full: When the water tank is full, the Water Full indicator will light up, and the unit will automatically stop operating. Empty the tank and reinsert it to resume operation.
- Power Off: Press the Power button again to turn off the dehumidifier.
5.3 Continuous Drainage
For extended operation without needing to empty the water tank, you can set up continuous drainage:
- Locate the continuous drainage outlet at the rear of the unit.
- Connect a suitable drain hose (not included) to this outlet. Ensure the connection is secure to prevent leaks.
- Route the hose to a floor drain or a larger container, ensuring the hose is sloped downwards to allow water to flow by gravity. Do not allow the hose to kink or be elevated above the unit.
6. Maintenance and Care
Regular maintenance ensures optimal performance and extends the lifespan of your dehumidifier.
6.1 Cleaning the Air Filter
The air filter should be cleaned every two weeks or more frequently depending on usage and air quality.
- Turn off the dehumidifier and unplug it from the power outlet.
- Remove the air filter from the rear of the unit.
- Clean the filter using a vacuum cleaner to remove dust and debris. For heavy dirt, wash the filter with warm, soapy water.
- Rinse the filter thoroughly and allow it to air dry completely before reinstalling. Do not expose to direct sunlight or high heat.
- Reinstall the dry filter into the unit.
6.2 Emptying and Cleaning the Water Tank
Empty the water tank when the 'Water Full' indicator illuminates. Clean the tank periodically to prevent mold and mildew growth.
- Turn off the dehumidifier and unplug it.
- Carefully pull out the water tank from the front of the unit.
- Empty the collected water.
- Clean the tank with mild detergent and warm water. Rinse thoroughly.
- Dry the tank completely before reinserting it into the dehumidifier.
6.3 External Cleaning
Wipe the exterior of the unit with a soft, damp cloth. Do not use harsh chemicals, abrasive cleaners, or solvents, as these can damage the surface.
6.4 Storage
If storing the unit for an extended period, ensure the water tank is empty and clean, and the air filter is clean and dry. Cover the unit to protect it from dust and store it in an upright position in a cool, dry place.
7. Troubleshooting Guide
Before contacting customer support, please refer to the following troubleshooting guide for common issues:
| Problem | Possible Cause | Solution |
|---|---|---|
| Dehumidifier does not turn on. | No power; power cord loose; water tank full or incorrectly inserted. | Check power supply; ensure cord is secure; empty and reinsert water tank correctly. |
| No water collected or insufficient dehumidification. | Room temperature too low; air filter clogged; humidity setting too high; unit size too small for area. | Ensure room temperature is above 5°C (41°F); clean air filter; lower desired humidity setting; ensure unit is appropriate for room size. |
| Unit is noisy. | Unit not on a level surface; air filter clogged; internal components vibrating. | Place on a level surface; clean air filter; if noise persists, contact support. |
| Water leaks from the unit. | Water tank not properly seated; continuous drainage hose loose or kinked. | Reinsert water tank correctly; check continuous drainage hose for secure connection and proper routing. |
8. Technical Specifications
| Feature | Specification |
|---|---|
| Model Name | Daitsu Deshumidificador ADDP-20 |
| Model Number | 3NDA0052 |
| Brand | Daitsu |
| Dimensions (W x D x H) | 30 x 35 x 51 cm |
| Weight | 16.26 kg |
| Humidity Removal Capacity | 20 Liters per day |
| Water Tank Volume | 3 Liters |
| Recommended Floor Area | Up to 52 square meters |
| Operating Mode | Continuous |
| Recommended Use | Residential |
9. Warranty Information
This Daitsu ADDP-20 Digital Dehumidifier comes with a standard manufacturer's warranty. Please refer to the warranty card included with your purchase for specific terms, conditions, and duration. Keep your proof of purchase for warranty claims.
10. Customer Support
If you have any questions, require technical assistance, or need to report an issue that cannot be resolved using the troubleshooting guide, please contact Daitsu customer support. Contact details can typically be found on the manufacturer's website or on the product packaging.