Honeywell Humidifier HCM-350B Manual

The Honeywell HCM-350B is a cool mist humidifier designed for medium to large rooms, featuring a patented UV technology to kill up to 99.9% of bacteria, mold, and fungus in the water. It includes a 1-gallon tank, three speed settings, an easy-to-clean design, an adjustable humidistat, a refill indicator, and an auto-shutoff function. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Water Tank with Handle, Humidifier Base with UV Chamber, Control Panel, Demineralization Cartridge (if included), and Power Adapter.

Installation & Setup

Unpack and inspect all components. Place on a flat, stable, waterproof surface away from electronics.

1. Remove all packaging materials from tank and base.
2. Install the demineralization cartridge (if included) into the slot inside the base.
3. Fill the tank with cool, clean tap water. Do not use hot water or additives.
4. Place the tank securely onto the base, ensuring it clicks into position.
5. Plug the power adapter into the humidifier and then into a 120V AC outlet.

WARNING! Always use the provided power adapter. Place humidifier on a level surface to prevent leakage. Keep away from children.

First-Time Use

Power on the humidifier; follow initial setup steps.

1. Press the POWER button to turn on the unit.
2. Select desired mist output using the SPEED button (Low, Medium, High).
3. Set the desired humidity level using the HUMIDISTAT knob (if equipped).
4. The UV indicator light will illuminate, showing the UV chamber is active.
5. Allow a few minutes for mist to appear. Adjust settings as needed.

CAUTION! Use only clean, cool water. Never operate without water in the tank. Ensure the tank is properly seated.

Specifications

• Model: HCM-350B
• Tank Capacity: 1 Gallon (3.8 Liters)
• Room Coverage: Up to 500 sq. ft. (medium to large room)
• Run Time: Up to 24 hours on low setting
• Mist Output: Up to 2.1 gallons per day (maximum)
• Speed Settings: 3 (Low, Medium, High)
• Humidistat: Adjustable, automatic humidity control
• Power Source: 120V AC, 60Hz (via included power adapter)
• Noise Level: Quiet operation, suitable for bedrooms
• Dimensions (approx.): 12.5" H x 10.5" W x 10.5" D
• Weight: 5.5 lbs (empty)

Controls and Settings

Control Panel: POWER Button, SPEED Button, HUMIDISTAT Knob, UV Indicator Light, Refill Indicator Light.

Operation: POWER turns unit on/off. SPEED cycles through Low, Medium, High mist output. HUMIDISTAT adjusts desired humidity level (turn clockwise to increase). UV light indicates UV chamber is working. Refill light glows when tank is empty.

Settings: Adjust speed based on room dryness and desired moisture level. Use Low for quiet nighttime operation. Use High for quickly raising humidity. Set humidistat to maintain comfort (typically 40-60% RH).

Operation Guide

Daily operation for optimal performance.

1. Ensure tank is filled with clean, cool water.
2. Press POWER to turn on. Select speed setting.
3. Adjust humidistat to desired level. Unit will cycle on/off to maintain it.
4. When refill indicator lights, turn off, unplug, and refill tank.
5. For maximum output, place humidifier centrally in room, at least 12 inches from walls.
6. Use in an enclosed room for best humidity retention.

Tip: Use distilled or demineralized water to minimize white dust and reduce cleaning frequency.

Cleaning & Maintenance

Regular cleaning prevents mold and mineral buildup. Unplug before cleaning.

1. Daily: Refill with fresh water. Wipe exterior with a damp cloth.
2. Weekly: Empty tank and base. Clean tank with mild soap and water; rinse thoroughly.
3. Monthly/As Needed: Descale if mineral deposits appear. Use white vinegar solution (1 part vinegar to 2 parts water) to soak affected parts for 20 minutes, then scrub gently and rinse.
4. Clean the UV chamber according to manual instructions (usually wiping with a soft cloth).
5. Ensure all parts are completely dry before reassembling.

WARNING! Never immerse base in water. Do not use abrasive cleaners or brushes. Always unplug before cleaning.

Filter Information

Demineralization Cartridge (if included): Reduces white dust by removing minerals from water.

• Replacement: Replace cartridge every 1-2 months or as indicated by reduced performance/visible sediment.
• Installation: Remove old cartridge. Rinse new cartridge under cool water for 30 seconds. Insert into slot in base.
• Note: Using distilled water can extend cartridge life. Cartridge is optional but recommended for hard water areas.

Safety Information

Important safety precautions to prevent injury or damage.

• Use only the provided power adapter.
• Always unplug before cleaning, refilling, or when not in use for extended periods.
• Do not operate without water in the tank.
• Place on a flat, stable, waterproof surface.
• Keep out of reach of children and pets.
• Do not block mist outlet or air intakes.
• Use only clean, cool tap, distilled, or demineralized water. Do not add essential oils or chemicals.
• If cord or plug is damaged, discontinue use and contact support.

CAUTION! To reduce risk of fire or electric shock, do not disassemble or attempt to repair the unit. Refer servicing to qualified personnel.

Regulatory Information

FCC Compliance: 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. For support, visit www.honeywellpluggedin.com or contact 1-800-332-1110.

Troubleshooting

Reset: Unplug unit for 1 minute, then restart.

Service: 1-800-332-1110; www.honeywellpluggedin.com