Honeywell Humidifier HUL535B Manual

The Honeywell HUL535B is a cool mist humidifier designed to add moisture to dry air in rooms up to medium size. It features a 1-gallon tank capacity, adjustable humidity control, a quiet operation mode, an easy-to-clean design, an automatic shut-off function when empty, a wicking filter, and a refill indicator light. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Water Tank, Base Unit with Motor, Wicking Filter, Humidity Control Dial, Power Switch, Refill Indicator Light, Mist Outlet.

Installation & Setup

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

1. Remove tank from base: Lift tank straight up by the handle.
2. Install the wicking filter: Remove filter from packaging, soak in cool water for 15 minutes, then insert into filter cage in base.
3. Fill the tank: Turn tank upside down, remove cap, fill with cool tap water to the MAX line. Replace cap securely.
4. Assemble: Place tank back onto base, aligning properly.
5. Plug into a standard 120V AC outlet.

WARNING! Use only clean, cool tap water. Do not use hot water, additives, or essential oils unless specified. Place on a water-resistant surface.

First-Time Use

Power on the humidifier; set desired mist level.

1. Ensure the unit is assembled correctly and plugged in.
2. Turn the Humidity Control Dial to the desired setting (Low, Medium, High).
3. Adjust the 360-degree mist outlet to direct moisture away from walls and furniture.
4. The unit will begin producing a cool mist. The refill light will glow when the tank is nearly empty.

CAUTION! Never operate the unit without the filter properly installed. Do not block the mist outlet.

Specifications

• Model: HUL535B
• Tank Capacity: 1 Gallon (3.8 Liters)
• Coverage Area: Up to Medium Rooms
• Run Time: Up to 24 hours on low setting
• Mist Output: Adjustable via control dial
• Filter Type: Demineralization/Wicking Filter (Honeywell part #HRF20)
• Power: 120V AC, 60Hz
• Noise Level: Quiet operation, suitable for bedrooms
• Dimensions (approx.): 13.5" H x 10.5" W x 10.5" D
• Weight (empty): 5.5 lbs

Controls and Settings

Main controls are located on the base unit.

Power Switch: Turns the unit on and off.
Humidity Control Dial: Rotate to adjust mist output (Low, Medium, High).
360-Degree Mist Outlet: Nozzle can be rotated to direct mist flow.
Refill Indicator Light: Illuminates when the water tank is low and needs refilling.
Filter Change Indicator: A reminder icon or light (if equipped) signals when to replace the wicking filter.

For optimal humidity (30-50%), start on a medium setting and adjust based on room conditions.

Operation Guide

Daily operation is simple. Ensure the tank is filled and the filter is in place.

1. Turn the Power Switch to the ON position.
2. Set the Humidity Control Dial to your preferred setting.
3. Adjust the mist outlet direction as needed.
4. When the Refill Light turns on, turn off the unit, unplug it, and refill the tank.
5. After refilling, plug in and turn the unit back on.

Tip: For best performance, use demineralization cartridges or distilled water in areas with hard water to reduce white dust and extend filter life.

Cleaning & Maintenance

Regular cleaning prevents mold and mineral buildup. Clean every 1-2 weeks during use.

1. Unplug the unit. Remove the water tank from the base.
2. Clean the Tank: Empty any remaining water. Wash the inside with a mild detergent and a soft brush or cloth. Rinse thoroughly.
3. Clean the Base: Wipe the exterior with a damp cloth. For the interior reservoir, use a mixture of 1 cup white vinegar and 1 gallon water. Let sit for 20 minutes, then scrub gently and rinse.
4. Dry Completely: Allow all parts to air dry completely before reassembling and storing or reusing.

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

Filter Replacement

The wicking filter (HRF20) should be replaced every 1-2 months, or more often with hard water.

1. Turn off and unplug the humidifier. Remove the tank.
2. Remove the old filter from the filter cage in the base.
3. Soak the new filter in cool water for 15 minutes.
4. Insert the new, soaked filter into the cage.
5. Reassemble the tank and base, then plug in and resume use.

Note: Using the humidifier without a filter or with an old, clogged filter can reduce performance and cause mineral dust.

Safety Information

Read all instructions before use.

• Use only as directed. Intended for indoor household use.
• Always place on a firm, flat, level surface.
• Keep out of reach of children and pets.
• Do not operate without water in the tank.
• Do not cover the mist outlet or block air vents.
• Unplug before cleaning, refilling, or when not in use for extended periods.
• Do not attempt to repair the unit yourself. Contact customer service.

CAUTION! To reduce the risk of fire or electric shock, do not use with a solid-state speed control device.

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 trademarks of Honeywell International Inc. For support, visit www.honeywellpluggedin.com or contact 1-800-332-1110.

Troubleshooting

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

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