Waykar DP903B Commercial Dehumidifier User Manual

Model: DP903B

Please read the manual carefully before operating the device and keep it for future reference.

Message from WAYKAR

Thank you for choosing Waykar. Established in 2014 with a commitment to protecting indoor climates, Waykar has grown into a leading brand in the HVAC industry, known for premium products that prioritize comfort and health in your indoor space.

Before you start exploring this product, read this manual carefully for necessary instructions first. It's advised to keep it for future reference.

24/7 Full-Time Response

Upon receipt of the dehumidifier, kindly inspect the package contents immediately for any potential missing or damaged parts. In case of issues, please contact Waykar support for solutions before initiating a return. Send an email to support@waykar.com or scan the QR code to start a live chat.

Important: Please Read Before Usage

Ensure the dehumidifier is always kept in an upright position to avoid internal damage. After unwrapping the dehumidifier, please set it upright and let it sit for 24 HOURS before plugging it in.

Note: The graphic illustrations in this manual are for demonstration purposes only. The actual product may vary slightly in size and shape.

General Safety Precautions

• The dehumidifier is designed for indoor use only and is not intended for operation on public transport.
• Avoid placing the device on soft, shaky, or uneven ground, as this may cause vibration and movement during operation.
• Verify that the dehumidifier's voltage matches your electrical supply and plug it into grounded outlets in accordance with local regulations regarding electrical safety.
• Ensure that the drain hose runs downward without bending or winding to facilitate continuous water drainage.
• Avoid contact with water as the dehumidifier is not waterproof.
• Be sure to unplug the dehumidifier first before cleaning or packing it. Turn off the dehumidifier before unplugging the device.
• For damaged cords, please contact the manufacturer or certified technicians for replacement to avoid hazards.
• Do not dismantle or modify the device without professional certification. Such actions may lead to safety hazards and void the warranty.
• If the dehumidifier is not going to be used for an extended period, please remember to unplug it.
• Keep the dehumidifier away from direct sunlight, heat-generating devices, and flammable materials, including stoves, gasoline, etc.
• Avoid sitting, standing, or placing heavy objects on the device.
• No pesticides or flammable liquids are allowed near the device.
• Avoid inserting fingers, rods, or other thin objects into the air inlet and outlet grilles of the dehumidifier.
• Stop and unplug the device immediately at any sign of malfunction.
• Do not tilt the device to prevent spilled water from damaging it.
• Children aged 8 and above, as well as individuals with reduced physical, sensory, or mental capabilities, should operate the device only under supervision. Children under 8 should not tamper with it.
• Use a soft cloth for cleaning and avoid splashing water directly on it. Neutral detergents are recommended for surface cleaning. Alcohol, gas, and benzene are prohibited for cleaning purposes.

• The transportation and disposal of this dehumidifier must comply with local regulations regarding flammable refrigerants.
• The appliance shall be installed, operated and stored in a room with a floor area larger than 54 sq. ft.
• Under no circumstances should you pierce or burn the dehumidifier casing, which may lead to refrigerant leak. Be aware that refrigerants may be odorless.
• Device maintenance and repair should be left to trained professionals due to the potential safety hazards and environmental concerns associated with refrigerant leaks. Certified technicians can consult the Maintenance & Cleaning section in this manual for guidance on handling the flammable refrigerant with caution.

Parts Illustration

Front View

The front of the dehumidifier features a Handle, Control Panel, and Air Inlet.

Rear View

The rear of the dehumidifier includes an Air Outlet, Continuous Drainage Port, Power Cord Buckle, and Cable Outlet.

Package Contents

The package of this commercial dehumidifier contains the following items:

• Commercial Dehumidifier × 1
• User Manual × 1
• Gravity Drain Hose × 1
• Pump Drain Hose × 1

Device Positioning & Placement

1. The operational temperature range for the dehumidifier must be maintained between 41°F to 100°F (5-38°C). Operation outside of this specified temperature range may lead to potential damage to the product. Therefore, please do not place the device in an area where temperatures fall outside of this range.
2. When positioning the dehumidifier, ensure it is not placed too close to walls or other objects, as this could obstruct the air vents. Maintain a minimum clearance of 39 inches above and around the device.
3. The device should be positioned, operated, and stored in an area with a minimum space of 54 sq. ft.

Function Overview

1. Control Panel

The control panel includes a Timing Display, Temperature Level indicator, Humidity indicator, and buttons for Power, Up, Down, OK, Timer, and Purge.

Button Instructions

• Power [Power Button Icon]: Turn on or off the unit.
• Up [Up Arrow Icon]: Adjusts the values upward for humidity and timer settings.
• Down [Down Arrow Icon]: Adjusts the values downward for humidity and timer settings.
• Timer [Timer Icon]: Turn on or off the timer function or set the timing hours.
• OK [OK Button Icon]: Confirm the humidity and timer settings.
• Purge [Purge Button Icon]: Enable the pump to drain water.

2. Indicators on the LCD Display

• [Power Indicator]: Lights up when the dehumidifier is turned on and off when turned off.
• [Plugged In Indicator]: Lights up when the dehumidifier has been plugged in but not turned on yet.
• [Humidity Display]: Shows the current room humidity. Pressing Up or Down buttons allows setting the target humidity.
• [Fan Running Indicator]: Lights up when the fan is running and turns off when it stops running.
• [Compressor Delay Indicator]: Flickers when the compressor is not kicked in, typically during the 3-minute compressor delay status or AUTO ON TIMER.
• [Continuous Mode Indicator]: Lights up when the setting humidity is 10%, and the dehumidifier enters into continuous mode.
• [Defrost Indicator]: Flashes when the dehumidifier is defrosting. The fan runs while the compressor is off. The dehumidifying function ceases until the frost melts. It lights off when defrosting is completed, and the dehumidifier begins to dehumidify automatically.
• [Pump Indicator]: Lights up when the pump is in good condition. It flashes when the pump is working to drain water.
• [Humidity Target Indicator]: The humidity display and 'Dehumidify' indicator blink when the ambient humidity value is lower than or equal to the preset humidity value. After 30 seconds, the compressor and fan stop working. The dehumidifier will automatically restart when the ambient humidity exceeds the preset value.

NOTE: Frequent defrost process indicates that the room temperature is too low. If the room temperature is lower than 60°F, consider adding heat to promote proper drying.

Operation Instructions

Power

Press the [Power Button Icon] to turn the dehumidifier on. When on, the [Power Indicator] is off, and the [Intelligent Dehumidifier Indicator] is on. Press the [Power Button Icon] again to turn it off. When off, the [Power Indicator] is on, and the [Intelligent Dehumidifier Indicator] is off.

NOTE: To protect the compressor, the fan will continue to operate for 5 seconds after the dehumidifier shuts off. Always use the [Power Button Icon] to stop the unit.

Check the Room Humidity

Check the room humidity readout ([Humidity Display]) on the control panel.

Set a Desired Humidity Percentage Value

Press the [Up Arrow Icon] or [Down Arrow Icon] button to preset your desired humidity level. The humidity level can be set within a range of 10%RH to 90%RH in 1%RH increments. The setting humidity needs to be at least 5% lower than the room humidity. After setting the target humidity, press [OK Button Icon] or wait 5 seconds to confirm.

NOTE:

1. The dehumidifier will stop and start automatically to maintain room humidity level within a range of ±5% of the preset target humidity. For example, if the set humidity is 50%, it stops at 45% and restarts at 55%.
2. If the preset humidity is equal to or higher than the room humidity, the dehumidifier will not start.
3. If the preset humidity level is 10%, the dehumidifier will enter continuous mode and run continuously.

Timer Setting

The [Timer Icon] function enables you to either delay AUTO-ON or delay AUTO-OFF the dehumidifier in the choice from 1 hour to 24 hours. Press the [Up Arrow Icon] and [Down Arrow Icon] to adjust the timer by 1 hour increments.

• Setting AUTO-ON timer: When the dehumidifier is off, press [Timer Icon] to set a timer to automatically start the machine.
• Setting AUTO-OFF timer: When the dehumidifier is on, press [Timer Icon] to set a timer to automatically shut down the machine.

NOTE: Before setting AUTO-ON TIMER, make sure the dehumidifier is plugged in.

1. For AUTO-ON setting, please turn on the dehumidifier to set a desired humidity level. Otherwise, it will maintain the previous setting humidity.
2. You can only set AUTO-ON timer when the dehumidifier is off or set AUTO-OFF timer when the machine is on. It is not able to set both AUTO-ON and AUTO-OFF timer at the same time.
3. The timer will ONLY function one time instead of cycling the dehumidifier on or off indefinitely.
4. The timer function will be disabled when the dehumidifier has been powered on/off manually.
5. Set the timer as 00, the timer function will not be activated.

Pump Setting

During operation, it will automatically pump the water out via the drain hose when the pump reservoir is full. No need manual intervention.

Before moving the dehumidifier, press the [Purge Button Icon] to empty the pump reservoir to avoid water spillage.

The [Pump Indicator] will blink when the pump is draining. The pump will stop working automatically in 40 seconds and stop blinking when the pump reservoir is almost empty.

3 Minutes Compressor Delay Mechanism

To avoid any damage to the dehumidifier, the unit will not start working in a 3 minutes complete cycle. If you turn the dehumidifier off and then restart it immediately, the compressor will not kick in until 3 minutes later. During this period, you can see the [Run Indicator] flashing on the LCD screen until the compressor kicks in.

Auto Defrost

When frost builds up on the evaporator coils, the compressor will stop working and the fan will continue to run until the frost melted. When the dehumidifier is defrosting, you can see the [Defrost Indicator] lights up on the LCD screen.

Auto Drainage

Thanks to the built-in pump, the dehumidifier will drain the condensation water automatically.

Auto-Restart

If the dehumidifier shuts off unexpectedly due to power outage, it will restart with the previous function settings automatically when the power resumes. The timer function will not be retained and you need to reset it.

Temperature Protection Function

• When the room temperature is higher than 113°F, the dehumidifier will automatically enter into HIGH-TEMPERATURE PROTECTION SYSTEM where the LCD screen shows [High Temp Indicator] and the compressor stops working.
• When the room temperature is lower than 40°F, the dehumidifier will automatically enter into LOW-TEMPERATURE PROTECTION SYSTEM where the LCD screen shows [Low Temp Indicator] and the dehumidifier stops working.

Drainage

Pump Drainage

During operation, the dehumidifier will automatically pump the water out via the drain hose when the pump reservoir is full. No need manual intervention.

Before turning on the dehumidifier, make sure the hose has been connected to the drain outlet properly.

1. Attach the hose to the drain outlet directly.
2. Press the [Purge Button Icon] to empty the pump reservoir.
3. The [Pump Indicator] will stop blinking when the pump reservoir is almost empty.
4. Take the hose out from the water collection container.

NOTE: Place the unattached end in a sink, drain, bucket or outdoors - anywhere that water can drain out safely. Ensure there are no kinks or other obstructions that will stop the water flow. If you use a bucket or other container for water collection, check it regularly to prevent overflows. The drain hose for the water pump can drain up to 15ft vertically. More than 15ft may cause water flow back to the pump and result in water leakage.

Continuous Drainage

1. Remove the top panel and detach the bottom panel with a screwdriver.
2. Remove the original connected short hose, insert the long hose through the continuous drainage port and connect it to the drainage outlet.
3. Install the bottom panel and then the top panel.

NOTE:

1. Please make sure the connections are tightly connected to avoid water leakage.
2. The hose should be lower than the drain outlet to avoid backflow.
3. The hose cannot be distorted or have substantial turning.

Troubleshooting

If a breakdown or problem occurs, refer to the troubleshooting section. Do not dismantle or repair the unit yourself, as improper repair may cause danger.

Error Codes

1. If the problems persist, please turn off and unplug the dehumidifier, and contact Waykar Customer Service: support@waykar.com.

2. When E1, E2 and E4 fault alarm, the dehumidifier can operate normally, but some functions are disabled. The dehumidifier will automatically resume to operate after the fault is eliminated.

Maintenance & Cleaning

Machine Cleaning

Wipe the dehumidifier housing with a soft damp cloth. Do not submerge or place water on the dehumidifier or control panel. Water may damage the electronic components of the machine. Do not use chemical solvents such as benzene, alcohol, gasoline or other heavy-duty cleaners, for they may damage or deform the surface.

Filter Cleaning

It's advised to clean the filter regularly and properly. Make sure to clean the filter at least once a month.

1. Open the panel from above and remove the filter.
2. Clean the dust on the surface with a vacuum or flush and wash the filter with detergent. Place it in a ventilated area. Do not expose the filter to strong sunshine or dry the filter with high temperature, as it may be distorted.
3. Install the filter and close the panel.

Device Storage

When the unit is not being used for a long period of time and you want to store it, please follow these steps:

1. Press the [Purge Button Icon] to drain out the water that accumulates at the bottom of the pump (recommend operating 2-3 times).
2. Unplug and wrap the cord with the power cord buckle.
3. Clean the air filter.
4. Cover the unit with a plastic bag.
5. Store the unit upright in a cool and dry place.

Warnings Regarding the R32 Refrigerant

This dehumidifier contains R32, a flammable refrigerant. All operators or maintenance personnel for refrigeration systems must hold a valid certificate from an industry-recognized body for the safe disposal of refrigerants. Repairs and maintenance should strictly adhere to the manufacturer's guidelines. If additional help is required, ensure it's under the supervision of personnel qualified in handling combustible refrigerants.

[Fire hazard symbol] Refrigerant Safety Group A2L

Transportation, Marking and Storage for Units that Employ Flammable Refrigerants

1. General: Information provided for units that employ FLAMMABLE REFRIGERANTS.
2. Transport of equipment containing flammable refrigerants: Additional transportation regulations may exist with respect to equipment containing flammable gas. The maximum number of pieces of equipment or configuration permitted to be transported together will be determined by applicable transport regulations.
3. Marking of equipment using signs: Signs for similar appliances are addressed by local regulations. Employers should ensure employees receive suitable instruction and training on the meaning of safety signs and actions needed.
4. Disposal of equipment using flammable refrigerants: Refer to national regulations.
5. Storage of equipment/appliances: Storage should be in accordance with applicable regulations or instructions.
6. Storage of packed (unsold) equipment: Storage package protection should prevent mechanical damage that could cause a refrigerant leak.

Requirements for Operation, Service and Installation Manuals of Appliances Using Flammable Refrigerants

Qualification of workers:

The manual shall contain specific information about the required qualification of working personnel for maintenance, service, and repair operations. Every working procedure that affects safety means shall only be carried out by competent persons. Examples include breaking into the refrigerating circuit or opening sealed components.

Competence of service personnel:

Information of procedures additional to usual information for refrigerating appliance installation, repair, maintenance, and decommission procedures is required when an appliance with FLAMMABLE REFRIGERANT is affected. Training is carried out by national training organizations or manufacturers accredited to teach relevant national competency standards.

Information and training

• Training should include information about the explosion potential of FLAMMABLE REFRIGERANTS.
• Information about POTENTIAL IGNITION SOURCES (e.g., lighters, switches, vacuum cleaners, electric heaters).
• Safety concepts: Unventilated vs. Ventilated enclosures, and safety in ventilated rooms.
• Information about refrigerant detectors: Principle of function, procedures for repair/replacement, and disabling detectors.
• Information about the concept of sealed components and sealed enclosures according to IEC60079-15:2010.
• Correct working procedures:
• Commissioning: Ensure floor area sufficiency, correct ventilation duct assembly, leak test before charging, and check safety equipment.
• Maintenance: Portable equipment shall be repaired outside or in a workshop equipped for servicing units with FLAMMABLE REFRIGERANTS. Ensure sufficient ventilation. Be aware of refrigerant loss and leaks. Discharge capacitors safely. Reassemble sealed enclosures accurately.
• Repair: Similar to maintenance, ensure sufficient ventilation and be aware of leaks.

No ignition sources

No person carrying out work in relation to a REFRIGERATING SYSTEM shall use any sources of ignition that may lead to the risk of fire or explosion. All possible ignition sources, including cigarette smoking, should be kept sufficiently far away. Prior to work, survey the area for flammable hazards or ignition risks. Display "No Smoking" signs.

Ventilated area

Ensure the area is open or adequately ventilated before breaking into the system or conducting hot work. Ventilation should continue during work to disperse any released refrigerant.

Checks to the refrigerating equipment

When electrical components are changed, they must be fit for purpose and to the correct specification. Follow manufacturer's maintenance and service guidelines. For FLAMMABLE REFRIGERANTS, check the refrigerant charge, ventilation machinery, indirect refrigerating circuits, and markings.

Checks to electrical devices

Repair and maintenance to electrical components require initial safety checks and component inspection. If a fault exists that could compromise safety, do not connect electrical supply until it is satisfactorily dealt with. Initial safety checks include discharging capacitors, ensuring no live electrical components are exposed, and checking earth bonding continuity.

Repairs to sealed components

During repairs to sealed components, disconnect all electrical supplies. If an electrical supply is necessary during servicing, a permanently operating leak detection system should be located at the most critical point.

Repair to intrinsically safe components

Do not apply any permanent inductive or capacitance loads without ensuring they do not exceed permissible voltage and current. Intrinsically safe components must be replaced with manufacturer-specified parts.

Cabling

Check cabling for wear, corrosion, excessive pressure, vibration, sharp edges, or adverse environmental effects, including aging or continual vibration.

Detection of flammable refrigerants

Do not use potential sources of ignition for detecting refrigerant leaks. Electronic leak detectors may be used, but sensitivity may need recalibration for FLAMMABLE REFRIGERANTS. Ensure the detector is not a source of ignition and is suitable for the refrigerant used. Leak detection equipment should be set at a percentage of the LFL of the refrigerant and calibrated. Leak detection fluids are suitable, but avoid detergents containing chlorine.

Removal and evacuation

When breaking into the refrigerant circuit, use conventional procedures. For flammable refrigerants, follow best practices due to flammability. Procedures include safely removing refrigerant, purging with inert gas, evacuation, and flushing.

Charging procedures

Ensure no contamination of refrigerants. Cylinders must be in an appropriate position. The system must be earthed prior to charging. Label the system when charging is complete. Pressure-test and leak-test the system before commissioning.

Decommissioning

Technicians must be familiar with the equipment. Recover refrigerants safely. Take oil and refrigerant samples if required. Ensure electrical power is available. Familiarize with equipment operation, isolate system electrically, and ensure safety before attempting the procedure.

Specifications

Note: Recommended operating temperature: 41°F to 100°F. The dehumidifier may experience malfunctions outside of this temperature range. The manufacturer reserves the right to modify the product without formal notice to the public.

Important: This warning is legally required by California's Proposition 65, which mandates disclosure even for trace amounts of certain substances. The warning does not indicate that the product is unsafe when used as intended; the risk primarily applies to long-term exposure to significant amounts of these substances. The levels in this product are negligible and within safe limits.

Warranty & Contact

Warranty

All Waykar products are covered under our 12-month warranty. Customers, whether purchasing directly from Waykar or through an authorized retailer, can reach out to Waykar for support. An order invoice or proof of purchase will be appreciated.

Product damage caused by regular wear and tear will not be covered under warranty, and the warranty will be voided for behaviors including but not limited to:

1. Failing to follow the instructions in the manual.
2. Purposeful mishandling of the device.
3. Damaging the device through violent impact.
4. Exposing the device to liquids or infiltrating foreign particles.
5. Unauthorized modification or overhauling of the device.
6. Damage from placing the device upside down.

Customers are welcome to contact Waykar for any feedback or advice.

Extend Your Warranty by 1 Year

Register your product at www.waykar.com to extend your 1-year warranty by an additional year. Please fill out all required fields and include your Order ID and Date of Purchase if applicable.

Customer Support

For any product-related queries, kindly contact the Waykar support team. In case of missing, displaced, or damaged dehumidifier parts, you can always reach out to Waykar support for assistance.

WAYKAR Office

• 805 Victory Trail Rd, Gaffney, SC, 29340 USA
• Email: support@waykar.com
• Tel: +1-(213)-895-4871
• Live Chat: www.waykar.com
• 24/7 Full-Time Response

*Have your Order Number ready before contacting customer support.