Honeywell Humidifier HCM-350 - Germ Free Cool Mist Manual

The Honeywell HCM-350 Germ Free Cool Mist Humidifier is a 3-gallon capacity humidifier designed to add moisture to dry air using UV technology to kill up to 99.9% of bacteria, mold, and fungus in the water. It features a quiet operation, easy-to-clean design, adjustable humidity control, and an automatic shut-off when the tank is empty. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation & Setup 3. First-Time Use 4. Specifications 5. Controls and Operation 6. Maintenance & Cleaning 7. Replacing the UV Lamp 8. Storage Instructions 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: 3-Gallon Water Tank, UV Chamber, Humidistat Control, Mist Output Nozzle, Carrying Handle, Power Cord, and Filter (if applicable).

Feature	Description
Germ Free Technology	UV light kills up to 99.9% of bacteria, mold, and fungus in water
3-Gallon Tank Capacity	Provides up to 24 hours of operation on low setting
Adjustable Humidistat	Dial control to set desired humidity level
Quiet Operation	Quiet fan for minimal disturbance
Easy-to-Clean Design	Tank and base are designed for easy cleaning
Automatic Shut-Off	Turns off when tank is empty or removed
Mist Output Control	Adjustable knob to control mist output level
Carrying Handle	Integrated handle for easy transport
Filter Indicator Light	Optional model feature to indicate when to clean or replace filter
Power Indicator Light	Shows when unit is powered on

Installation & Setup

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

Remove tank: Lift tank off base by the handle.
Fill tank: Turn tank upside down, remove cap, and fill with cool, clean tap water. Replace cap securely.
Place tank: Set tank upright on a level surface, then place back onto base.
Plug in: Connect power cord to a standard 120V AC outlet.

WARNING! Do not use with extension cords or place near heat sources. Ensure unit is on a waterproof surface to prevent water damage.

First-Time Use

Power on the humidifier and set desired humidity level.

Initial setup: Fill tank as described, place on base, and plug in.
Set humidity: Turn humidistat dial to desired setting (e.g., 40-50% for comfort).
Adjust mist: Turn mist control knob to desired output (Low, Medium, High).
Monitor: Allow 24 hours to reach desired humidity level in room.

CAUTION! Use only clean, cool tap water. Do not add essential oils or other additives, as they can damage the unit.

Specifications

Model: HCM-350
Tank Capacity: 3 gallons (11.4 liters)
Coverage Area: Up to 500 square feet
Run Time: Up to 24 hours on low setting
Output: Up to 2.1 gallons per day
Technology: UV technology for germ reduction
Noise Level: Quiet operation (approx. 32 dB on low)
Power Source: 120V AC, 60Hz
Dimensions: Approximately 15.5" H x 10.5" W x 10.5" D
Weight: 7.5 lbs (empty)

Controls and Operation

Front Panel: Power Indicator Light, Humidistat Control Dial, Mist Output Control Knob.

Operation: Turn humidistat dial to set desired humidity level (OFF, LOW, MEDIUM, HIGH). Adjust mist output knob to control visible mist. The unit will run until desired humidity is reached, then cycle on/off automatically.

UV Light: The UV chamber light indicates germ reduction is active when unit is running. If UV light does not illuminate, refer to troubleshooting.

Maintenance & Cleaning

Regular cleaning prevents mineral buildup and ensures efficient operation.

Unplug unit and remove tank.
Clean tank: Use mild detergent and soft cloth; rinse thoroughly.
Clean base: Wipe with damp cloth; do not immerse in water.
Descale: Use white vinegar solution to remove mineral deposits if needed (monthly in hard water areas).
Dry completely before reassembly.

Tip: Clean unit at least once a week during use, or more often in hard water areas.

Replacing the UV Lamp

The UV lamp should be replaced annually for optimal germ reduction.

Unplug unit and ensure it is dry.
Access UV chamber: Remove cover as per model instructions (typically slides or twists off).
Remove old lamp: Gently pull out UV lamp assembly.
Insert new lamp: Align pins and push into socket until secure.
Replace cover and plug in unit. UV indicator light should illuminate when running.

WARNING! Handle UV lamp carefully; avoid touching glass. Dispose of old lamp according to local regulations.

Storage Instructions

Prepare unit for storage when not in use for extended periods.

Unplug unit and empty all water from tank and base.
Clean thoroughly as described in Maintenance section.
Allow all parts to dry completely.
Reassemble and store in original box or protective cover in a cool, dry place.

CAUTION! Do not store with water in tank to prevent mold or bacterial growth.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © Honeywell International Inc. For support, visit www.honeywellhumidifiers.com or contact 1-800-332-1110. This product is covered by a limited warranty; see warranty card for details.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No mist output	Empty tank, clogged nozzle, incorrect setting	Fill tank, clean mist nozzle, adjust mist control to higher setting.
UV light not on	Lamp failure, power issue	Ensure unit is plugged in; replace UV lamp if needed.
Unit not powering on	No power, tank not seated	Check outlet; ensure tank is properly placed on base.
White dust output	Mineral deposits in water	Use demineralization cartridge or distilled water; clean unit.
Water leakage	Loose cap, overfilled tank, cracked tank	Tighten cap; do not overfill; inspect tank for damage.
Unusual noise	Fan obstruction, mineral buildup	Check for obstructions; clean fan and internal parts.

Reset: Unplug unit for 10 minutes, then restart.

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