Honeywell Humidifier HWM845B Manual

The Honeywell HWM845B is a top-fill cool mist humidifier designed for medium to large rooms. It features a 1.5-gallon tank, adjustable humidity control, a built-in humidistat, a quiet operation mode, an easy-to-clean design, an automatic shut-off when empty, a refill indicator light, and a wicking filter. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 1.5-Gallon Top-Fill Tank, Control Panel with Digital Display, Adjustable Humidistat, Wicking Filter, Quiet Operation Mode, Refill Indicator, Automatic Shut-Off.

Installation & Setup

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

1. Remove all packaging materials from inside and outside the unit.
2. Install the wicking filter: Remove filter from packaging, soak in cool water for 15 minutes, then insert into filter tray.
3. Place the humidifier on a waterproof mat or towel in case of condensation.
4. Ensure the unit is positioned at least 12 inches from walls and furniture for proper airflow.
5. Plug the power cord into a standard 120V AC outlet.

WARNING! Use only on a level surface to prevent leakage. Do not place under shelves or near heat sources.

First-Time Use

Power on the humidifier; follow initial setup steps.

1. Fill the tank with clean, cool tap water (do not use hot water or additives).
2. Place tank securely back on the base; you will hear a click when properly seated.
3. Press the POWER button to turn on the unit.
4. Set desired humidity: Use the UP/DOWN buttons to select a level between 30% and 60%.
5. Adjust mist output: Use the MIST control to set low, medium, or high output.
6. For quiet operation: Press the QUIET MODE button to reduce fan noise.

CAUTION! Always use clean, cool water. Never add essential oils, fragrances, or chemicals to the water tank.

Specifications

• Tank Capacity: 1.5 gallons (5.7 liters).
• Room Coverage: Up to 500 square feet.
• Run Time: Up to 24 hours on low setting.
• Humidity Control: Adjustable humidistat (30%-60%).
• Display: Digital LCD showing humidity level and settings.
• Mist Output: Adjustable (Low, Medium, High).
• Noise Level: ≤ 30 dB in Quiet Mode.
• Filter Type: Wicking filter (Model HF-845B).
• Power Source: 120V AC, 60Hz, 25W.
• Dimensions: 12.5" H x 10.5" W x 9.5" D.
• Weight: 7.5 lbs (empty).

Controls and Operation

Control Panel: POWER, HUMIDITY UP/DOWN, MIST LEVEL, QUIET MODE, FILTER RESET.

Digital Display: Shows current room humidity, set humidity, mist level, filter status, and refill indicator.

Humidity Setting: Press HUMIDITY buttons to set target humidity (30%-60%). The humidifier will cycle on/off to maintain this level. Mist Level: Adjust from Low (1) to High (3) for desired moisture output. Quiet Mode: Activates low-speed fan for minimal noise. Filter Reset: Hold FILTER button for 3 seconds after replacing filter to reset indicator.

Filling the Water Tank

Top-fill design allows filling without removing the tank.

1. Turn off and unplug the humidifier.
2. Open the top fill cap located on the top of the unit.
3. Pour clean, cool tap water directly into the opening. Use a pitcher if needed.
4. Close the fill cap securely.
5. The digital display will show the water level; refill indicator light turns off.
6. Plug in and press POWER to resume operation.

Tip: For easier cleaning, you can remove the tank by lifting it straight up. Carry using the handle.

Maintenance & Cleaning

Regular cleaning prevents mold and mineral buildup.

1. Daily: Wipe exterior with a damp cloth.
2. Weekly: Empty any remaining water, rinse tank with clean water.
3. Every 2 Weeks (Deep Clean):
   • Unplug unit and empty all water.
   • Remove tank and base components.
   • Clean tank with a mixture of 1 teaspoon white vinegar and 1 gallon water. Scrub with soft brush.
   • Rinse all parts thoroughly with clean water.
   • Wipe base and mist nozzle with vinegar solution and soft cloth.
   • Allow all parts to air dry completely before reassembly.

WARNING! Never immerse the base unit in water. Do not use abrasive cleaners or brushes.

Filter Replacement

Replace wicking filter every 1-2 months for optimal performance.

1. Turn off and unplug the humidifier.
2. Remove the water tank.
3. Open the filter compartment door on the side or back of the unit.
4. Remove the old filter and dispose of it.
5. Soak the new HF-845B filter in cool water for 15 minutes.
6. Insert the new filter into the tray, ensuring it is seated properly.
7. Close the filter compartment door.
8. Hold the FILTER RESET button for 3 seconds to reset the filter indicator light.

Note: Using the humidifier without a filter or with a clogged filter can reduce performance and cause white dust.

Safety Information

Important safety precautions to prevent injury or damage.

• Use only on a level, stable surface.
• Always unplug before cleaning, filling, or maintenance.
• Use only clean, cool tap water. Do not use hot water.
• Never add essential oils, fragrances, or chemicals to the water tank.
• Keep out of reach of children and pets.
• Do not operate in an enclosed space or under shelves.
• Do not cover the mist outlet or air intakes.
• If the cord is damaged, discontinue use and contact support.

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

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. ETL Listed for safety. Copyright © Honeywell International Inc. Honeywell and the Honeywell logo are registered trademarks. For support, visit www.honeywellhumidifiers.com or contact 1-800-332-1110.

Troubleshooting

Reset: Unplug unit for 5 minutes to reset electronic controls.

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