1. Introduction
This manual provides essential information for the safe and efficient operation of your Keystone 50-Pint Portable Dehumidifier. Please read it thoroughly before using the appliance and retain it for future reference.
The Keystone 50-Pint Portable Dehumidifier is designed to remove up to 50 pints of moisture from the air per day, improving air quality and reducing humidity, odor, and dampness in spaces up to 4,500 square feet. It is ideal for basements, garages, and living rooms.

Image: The Keystone 50-Pint Portable Dehumidifier positioned in a modern living room, demonstrating its compact size and aesthetic integration into a home environment.
2. Key Features
- High Capacity Dehumidification: Removes up to 50 pints of moisture daily, suitable for extra-large rooms up to 4,500 sq. ft.
- Convenient Portability: Equipped with 4 omni-directional caster wheels for easy movement.
- Electronic Controls: Features settings for normal, turbo, auto-defrost, and auto-restart.
- Quiet Operation: Operates at a low noise level of 55dB, minimizing disruption.
- Full Bucket Alert & Auto Shut-off: Notifies when the 1.8-gallon water tank is full and automatically shuts off to prevent spills.
- Washable Dust Filter: Removable and reusable filter for easy maintenance.
- Continuous Drain Option: Allows for hands-off operation by connecting a standard garden hose to a low-level drain.

Image: A graphic highlighting the dehumidifier's features, including 50 pints per day dehumidification, 1.8-gallon water tank, normal/turbo/auto-defrost settings, LED display, 24-hour timer, and filter alert.

Image: A visual representation of the dehumidifier's compact size (approx. 24"H x 15"W x 11"D) and its low noise level of 51 dBA, comparable to a gentle rainfall.
3. Setup and Installation
- Unpacking: Carefully remove the dehumidifier from its packaging. Retain all packaging materials for future storage or shipping.
- Placement: Place the dehumidifier on a flat, stable surface in the desired location. Ensure there is at least 8 inches of space around the unit for proper air circulation. Avoid placing it near heat sources or in direct sunlight.
- Power Connection: Plug the power cord into a grounded electrical outlet. Ensure the voltage matches the unit's requirements.
- Water Bucket Installation: Ensure the water bucket is correctly seated in the unit. The unit will not operate if the bucket is not properly installed or is full.
- Continuous Drain Setup (Optional): For continuous operation without emptying the bucket, attach a standard garden hose (not included) to the continuous drain outlet at the back of the unit. Route the hose to a low-level drain, ensuring it is sloped downwards to allow gravity drainage.

Image: A diagram illustrating the continuous drainage option, showing a standard garden hose connected to the dehumidifier for hands-off operation into a low-level drain.
4. Operating Instructions
Control Panel Overview
The control panel features an LED display and various buttons for setting and monitoring the dehumidifier's operation.

Image: A close-up view of the dehumidifier's top-mounted control panel, displaying the various function buttons and the digital screen.
Basic Operation
- Power On/Off: Press the Power button to turn the unit on or off.
- Setting Humidity Level: Use the Up and Down arrow buttons to set your desired humidity level (e.g., 40% - 50% for optimal comfort). The unit will operate until the set humidity is reached.
- Fan Speed: Press the Fan button to cycle through fan speeds (e.g., Low, High, Turbo).
- Timer Function: Press the Timer button to set a delayed start or stop time for the unit.
- Continuous Mode: Select the Cont. (Continuous) mode for the unit to run continuously, regardless of humidity level. This is often used with the continuous drain option.
- Auto-Defrost: The unit features an automatic defrost function that activates when frost builds up on the evaporator coils, ensuring efficient operation in cooler environments.
- Auto-Restart: In case of a power outage, the unit will automatically restart with the previous settings once power is restored.
Pump Function (if applicable)
If your model includes a pump, press the Pump button to activate the internal pump for vertical water drainage. This is useful when a low-level drain is not available.
5. Maintenance
Emptying the Water Bucket
When the water bucket is full, the "Full Bucket" indicator will illuminate, and the unit will automatically shut off. Carefully remove the bucket using the handle and empty the collected water. Reinsert the bucket firmly until it clicks into place.

Image: A graphic illustrating the built-in full bucket alert and auto shut-off, along with the removable water tank featuring an easy-to-carry handle.
Cleaning the Air Filter
The "Check Filter" alert will illuminate periodically, indicating that the air filter needs cleaning. A dirty filter can reduce efficiency and airflow.
- Gently pull out the air filter from the back of the unit.
- Wash the filter with warm, soapy water. Rinse thoroughly.
- Allow the filter to air dry completely before reinserting it into the unit.
- Press the "Filter" button on the control panel to reset the filter indicator.
General Cleaning
Wipe the exterior of the unit with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on. | No power; Water bucket full or improperly installed. | Check power connection; Empty and properly reinsert water bucket. |
| Unit runs but does not dehumidify. | Air filter clogged; Room temperature too low; Humidity setting too high. | Clean air filter; Ensure room temperature is above 41°F (5°C); Lower humidity setting. |
| Unit is noisy. | Unit not on a level surface; Air filter clogged. | Place unit on a flat, stable surface; Clean air filter. |
| Water leaks from the unit. | Water bucket improperly installed; Continuous drain hose kinked or clogged. | Reinstall water bucket correctly; Check and clear continuous drain hose. |
7. Specifications
- Brand: Keystone
- Model Name: Keystone 50-Pint Portable Dehumidifier
- Model Number: KSTAD504E
- Dehumidification Capacity: 50 Pints per Day
- Coverage Area: Up to 4,500 Square Feet
- Water Tank Volume: 1.8 Gallons (6 Liters)
- Product Dimensions (DxWxH): 11.1"D x 15.43"W x 24.25"H
- Item Weight: 45.2 pounds
- Noise Level: 55dB (Quiet Operation)
- Wattage: 720 watts
- Number of Speeds: 2
- Operation Mode: Continuous
- Special Features: Anti-Spill, Automatic Defrost, Automatic Restart, Portable, Quiet Operation
- Included Components: Dehumidifier, Manual, Warranty
- Material: Plastic
- Color: White
- UPC: 840148702448
- ASIN: B09CTBTXX2

Image: A chart detailing the recommended dehumidification capacity based on room size, showing 22 pints for 1500 sq. ft., 35 pints for 3000 sq. ft., and 50 pints for 4500 sq. ft.
8. Warranty Information
Keystone stands by its products with a 1-year warranty. For specific details regarding your warranty coverage, please refer to the warranty documentation included with your purchase or contact Keystone customer support.
Additional protection plans may be available for purchase. Please check with your retailer for options such as 3-Year or 4-Year Protection Plans.
9. Customer Support
For any questions, technical assistance, or warranty claims, please contact Keystone customer support. Refer to the contact information provided in your product packaging or visit the official Keystone website for the most up-to-date support details.
You can also visit the Keystone Store on Amazon for more product information and resources.





