Honeywell Humidifier HCM-350B-CST SERIES Manual

The Honeywell HCM-350B-CST Series is a cool mist humidifier designed for medium to large rooms, featuring UV technology to kill up to 99.9% of bacteria, mold, and fungus in the water, a 1-gallon tank capacity, three speed settings, a 24-hour humidistat, easy-to-clean design, filter-free operation, and an automatic shut-off when empty. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Main unit with UV chamber, 1-Gallon Removable Tank, Control Panel, Humidistat, Mist Nozzle, and Power Adapter.

Installation & Setup

Unpack and inspect all contents. Place on a flat, stable, and level surface away from direct sunlight and heat sources.

1. Remove all packaging materials from the tank and base unit.
2. Fill the tank with cool, clean water. Do not use hot water or additives.
3. Place the tank securely onto the base unit, ensuring it is properly seated.
4. Position the humidifier at least 12 inches away from walls and furniture for proper mist dispersion.
5. Plug the power adapter into the unit, then into a standard 120V AC outlet.

WARNING! Always use the provided power adapter. Do not operate with a damaged cord or plug. Ensure the unit is on a dry surface.

First-Time Use

Before first use, clean the tank and base according to the Maintenance section. Then, power on the unit.

1. Fill the tank with clean, cool water and place it on the base.
2. Plug in the unit. The power indicator light will illuminate.
3. Press the POWER button to turn on the humidifier.
4. Use the SPEED button to select Low, Medium, or High mist output.
5. Set your desired humidity level using the HUMIDISTAT dial (if equipped).
6. Adjust the 360-degree mist nozzle to direct moisture where needed.

CAUTION! Never add essential oils, fragrances, or water treatment chemicals to the tank, as this can damage the unit and void the warranty.

Specifications

• Model Series: HCM-350B-CST
• Type: Cool Mist Humidifier with UV Technology
• Room Coverage: Up to 500 sq. ft. (Medium to Large Rooms)
• Tank Capacity: 1 Gallon (3.8 Liters)
• Run Time: Up to 24 hours on low setting
• Output: Up to 2.1 gallons per day (Maximum)
• Speed Settings: 3 (Low, Medium, High)
• Controls: Electronic buttons, 24-hour humidistat
• Power Source: 120V AC, 60Hz (via included power adapter)
• Noise Level: Quiet operation, suitable for bedrooms
• Dimensions (approx.): 12.5" H x 12.5" W x 9.5" D
• Weight (empty): 5.5 lbs

Controls and Settings

Control Panel located on the front of the unit.

Buttons & Dials: POWER (On/Off), SPEED (cycles through Low, Medium, High), HUMIDISTAT Dial (sets target humidity level, if model includes).

Indicators: Power Light (illuminates when plugged in and on), Speed Indicator Lights (show selected setting), UV Light Indicator (shows UV chamber is active).

Operation Modes: Constant Run (runs until tank is empty or turned off), Humidistat Mode (automatically cycles to maintain set humidity level).

Operation Guide

For daily operation, ensure the tank is filled with clean, cool water.

1. Starting: Press POWER. Select speed with SPEED button.
2. Setting Humidity: Turn the HUMIDISTAT dial to your desired level (e.g., 40-50% for comfort). The unit will cycle on/off to maintain it.
3. Adjusting Mist Direction: Rotate the nozzle to direct mist away from walls, furniture, and electronics.
4. Refilling: When the tank is empty or the mist stops, the unit will automatically shut off. Unplug, remove tank, refill, replace, and restart.
5. Night Use: Use the Low setting for quiet operation. The indicator lights can be dimmed (if equipped) or covered.

Tip: Use distilled or demineralized water to minimize white dust on surfaces.

Maintenance & Cleaning

Regular cleaning is essential for performance and to prevent microbial growth. Clean every 1-2 weeks, or more often in hard water areas.

1. Unplug the unit. Remove the tank and empty any remaining water.
2. Clean the Tank: Wash with mild dish soap and warm water. Rinse thoroughly. The tank is top-rack dishwasher safe.
3. Clean the Base: Wipe the exterior with a soft, damp cloth. Do not immerse the base in water.
4. Clean the UV Chamber & Mist Nozzle: Use a soft brush or cloth to remove any mineral deposits. Refer to manual for specific cleaning of the UV chamber.
5. Descale (if needed): For mineral buildup, use a mixture of white vinegar and water (1:1) to soak affected parts for 20 minutes, then scrub and rinse thoroughly.
6. Dry Completely: Allow all parts to air dry completely before reassembling and storing or reusing.

CAUTION! Never use abrasive cleaners, bleach, or harsh chemicals. Do not allow water to enter the electrical components or vents on the base.

Water Treatment

The built-in UV technology treats the water as it passes through the system. For optimal performance and to reduce white mineral dust:

• Recommended: Use distilled or demineralized water.
• Acceptable: Clean, cool tap water. More frequent cleaning may be required.
• Not Recommended: Hot water, softened water (from a salt-based softener), or water with additives (oils, fragrances, chemicals).

The UV lamp has a limited lifespan. If the UV indicator light does not illuminate or performance decreases, the UV module may need service.

Regulatory Information

This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. Copyright © Honeywell International Inc. Honeywell and the Honeywell logo are registered trademarks of Honeywell International Inc. For support in the US and Canada, visit www.honeywellpluggedin.com or contact 1-800-332-1110.

Troubleshooting

Reset: Unplug the unit for 5 minutes, then plug back in.

Service: For issues not resolved above, contact Honeywell Customer Service at 1-800-332-1110 or visit www.honeywellpluggedin.com. Do not attempt to repair the unit yourself.