Honeywell Humidifier HWM-450 Manual

The Honeywell HWM-450 is a cool mist humidifier designed for medium to large rooms, featuring a 1-gallon tank capacity, adjustable humidity control, quiet operation, wick filter system, auto shut-off, and easy-to-clean design. It helps relieve dry air discomfort from heaters and air conditioners. 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 Filter 8. Safety Features 9. Care & Storage 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Water Tank, Base with Motor, Wick Filter, Control Knob, Mist Outlet, and Power Cord.

Feature	Description
1-Gallon Tank Capacity	Provides up to 24 hours of operation on low setting
Adjustable Humidity Control	Knob to set desired mist output level
Wick Filter System	Absorbs minerals and impurities from water
Quiet Operation	Designed for bedroom or office use
Auto Shut-Off	Turns off when tank is empty or removed
Easy-Fill Tank	Wide opening for convenient refilling
Mist Outlet	Adjustable direction for mist dispersion
Filter Change Indicator	Reminder light when filter needs replacement
Carry Handle	Integrated handle for easy transport
Power Cord Storage	Compartment to wrap excess cord

Installation & Setup

Unpack and inspect all parts. Place on a flat, stable surface away from walls and electronics.

Remove tank from base and unscrew cap.
Fill tank with cool, clean water up to fill line. Do not use hot water.
Replace cap securely and wipe any spills.
Place tank back onto base, aligning properly.
Insert new wick filter into base slot, ensuring it sits fully in water.
Plug power cord into grounded 120V AC outlet.

WARNING! Place humidifier on a water-resistant surface. Keep away from children and pets. Do not block mist outlet.

First-Time Use

After setup, allow filter to soak for 15-20 minutes before operation.

Turn control knob to desired mist level (Low, Medium, High).
Adjust mist outlet direction as needed.
Monitor humidity levels; adjust knob to maintain comfort.
Refill tank when empty; unit will auto shut-off.

CAUTION! Use only clean, cool tap or distilled water to prolong filter life and prevent white dust.

Specifications

Model: HWM-450 Cool Mist Humidifier
Coverage: Up to 400 sq. ft. (medium to large room)
Tank Capacity: 1 gallon (3.8 liters)
Run Time: Up to 24 hours on low setting
Mist Output: Adjustable, up to 1.2 gallons per day
Filter Type: Replaceable wick filter (Part #HWM-450F)
Power: 120V AC, 60Hz, 30W
Dimensions: 13.5" H x 10.5" W x 9.5" D
Weight: 5.5 lbs (empty)
Noise Level: < 35 dB on low setting

Controls and Operation

Control Knob: Turn clockwise to increase mist output (OFF → LOW → MED → HIGH). Mist Outlet: Adjustable 180° to direct mist flow.

Operation Tips: For best results, place unit on elevated surface (not floor). Maintain 40-60% relative humidity. Use in rooms up to 400 sq. ft. Clean unit weekly to prevent mold/mildew.

Filter Change Indicator: LED light illuminates when filter needs replacement (typically every 1-2 months). Auto Shut-Off: Activates when tank is empty or improperly seated.

Maintenance & Cleaning

Regular cleaning prevents mineral buildup and bacteria growth.

Unplug unit and remove tank.
Empty any remaining water from base.
Clean tank with mild soap and warm water; rinse thoroughly.
Wipe base interior with damp cloth; do not submerge.
Use vinegar solution (1 cup white vinegar + 1 gallon water) to descale if needed.
Dry all parts completely before reassembly.
Replace wick filter every 1-2 months or when discolored/hard.

CAUTION! Never use abrasive cleaners, bleach, or detergents. Do not immerse base in water.

Replacing the Filter

Use only genuine Honeywell HWM-450F replacement filters.

Unplug unit and remove tank.
Remove old filter from base slot; discard.
Insert new filter into slot, ensuring bottom contacts water.
Soak filter for 15-20 minutes before use.
Reset filter change indicator by pressing and holding button for 3 seconds (if equipped).

Tip: Using distilled water extends filter life and reduces white dust.

Safety Features

Auto Shut-Off: Prevents motor damage when tank is empty. Tip-Over Protection: Shuts off if unit is knocked over. Overheat Protection: Thermal fuse prevents overheating. Low Water Indicator: Mist reduces as tank empties.

Care & Storage

When not in use for extended periods:

Unplug and empty all water.
Clean and dry thoroughly.
Remove and discard old filter.
Store in original box in cool, dry place.
Do not store with filter installed to prevent mold.

CAUTION! Never store with water inside. Ensure complete dryness to prevent mildew.

Regulatory Information

FCC Part 15: Class B device; complies with interference limits. UL Listed: Meets safety standards. Copyright © Honeywell International Inc. For support, visit www.honeywellhumidifiers.com or contact 1-800-332-1110. Use only as directed. Keep out of reach of children.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No mist output	Empty tank, clogged filter, incorrect setup	Refill tank; replace filter; ensure filter is soaked and properly installed.
Low mist output	Mineral buildup, old filter, low setting	Clean unit; replace filter; increase mist setting.
White dust on surfaces	Hard water minerals	Use distilled water; replace filter; clean more frequently.
Unit not turning on	No power, auto shut-off engaged	Check outlet; ensure tank is properly seated and filled.
Water leakage	Loose cap, overfilled tank, cracked tank	Tighten cap; fill to line only; inspect for damage.
Unusual noise	Mineral buildup, motor issue	Clean unit; ensure level surface; contact support if persistent.
Filter change light on	Filter needs replacement	Replace with HWM-450F filter; reset indicator.

Reset: Unplug for 1 minute, then restart. For persistent issues, contact support.

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