User Manual For The Kosmen KM-250S Dehumidifier

Product Functions

Dehumidification

The Kosmen KM-250S dehumidifier offers a powerful 250L/day dehumidification capacity, effectively controlling humidity to prevent mold and protect goods.

Dry Mode

Uses dehumidified airflow to dry and balance the humidity in the environment. This function quickly and continuously removes moisture from the air or objects to dry spaces, items, or materials.

Timer

This function allows you to set the operating time of the machine from 1 to 24 hours.

Wi-Fi Control

Enables remote control via a mobile app. You can adjust features, monitor ambient humidity, set timers, or schedule the device to operate based on your needs.

CO Mode (Continuous Operation)

A continuous dehumidification mode that allows the machine to operate non-stop until the user changes the settings.

Auto Defrost

When operating in low-temperature environments, the machine automatically detects the system temperature. If frost is detected, the machine will pause and enter defrost mode.

After defrosting is complete, the machine will automatically restart.

Memory Function

• The machine is equipped with a memory system that records the working history and remembers the last operating status before a power outage. It can maintain this setting for up to 72 hours after the power is cut off. When power is restored, the device will restart and resume the previous settings.

Note: Please turn off the power when leaving the machine unattended to ensure safety and save energy.

User Manual – Kosmen KM-250S Industrial Dehumidifier

Operating Instructions

On/Off Button

Press the On/Off button to power the machine on or off.

Timing

Press the “Timing” button. When the time indicator light is on, you can set the timer (adjustable from 0 to 24 hours).

Dry Mode

Press the “Dry” button to activate or deactivate drying mode. (Pressing the "+" or "-" button or any other button will exit Dry mode.)

CO Mode

Press the “CO” button to activate continuous dehumidification mode. (Pressing the "+" or "-" button or any other button will exit CO mode.)

ADD (+)

Each press increases the set Relative Humidity (RH) value by 1%. (The environmental HUM value will revert to the ambient humidity level after 6 seconds of inactivity.)

Subtract (-)

Each press decreases the set RH value by 1%. (The environmental HUM value will revert to the ambient humidity level after 6 seconds of inactivity.)

Set

Note: This function is intended for technical personnel. Do not change these settings unless specifically required.

Wi-Fi Connection

Press and hold the “WiFi” button for 5 seconds to switch the device to Wi-Fi pairing mode.

Steps to Connect:

1. Download the “Smart Life” or “Tuya Smart” app to your smartphone.

2. Use the app to scan the QR code on the device and follow the in-app instructions to connect to Wi-Fi.

3. Important Notes:

• During setup, keep all three devices — the dehumidifier, your smartphone, and the router — close to each other.
• Ensure a stable internet connection and connect only to a 2.4GHz Wi-Fi network.
• Follow the app instructions carefully to complete the connection process.
• Make sure the Wi-Fi password is entered correctly.

4. Follow the app’s instructions to enter Wi-Fi pairing mode and complete the connection.

User Manual – Kosmen KM-250S Industrial Dehumidifier

Operating Guide

When the device is powered on for the first time, it will be in standby mode. Press the power button and set the desired humidity at least 3% lower than the current ambient humidity to initiate operation. If the set humidity is higher than the ambient humidity, the dehumidifier will not operate.

Dehumidifier Operation

• The compressor will start operating if the 3-minute protection delay has passed and the room humidity is ≥ set humidity + 5% RH.
• The compressor will stop when the room humidity is < set humidity - 5% RH.
• If the room humidity is within the range: (Set humidity - 5%) < Current humidity < (Set humidity + 5% RH), the compressor will maintain its current status (will not turn on/off).
• If the humidity drops and the compressor does not operate for 3 minutes, the fan will automatically shut off.

Drainage Indicator

The unit has a continuous drainage outlet connected to a plastic hose for direct discharge. Do not place the end of the drainage hose in standing water. Avoid long or elevated hose paths that may create backpressure, causing water leakage due to blocked drainage.

Inspection & Maintenance

Important Notes – Read Before Use

Installation Notes

Electrical Connection

• Must be performed by qualified technicians and comply with local electrical standards.
• For 3-phase power: control wires are color-coded to prevent confusion.

Voltage & Frequency

• Operate only within the voltage and frequency range listed on the nameplate.

Power Check

• Ensure voltage fluctuation stays within ±10% of rated voltage.

Electrical Safety

• The machine must be grounded and connected via an external circuit breaker.

Fuses & Power Cable

• Fuse rating: 1.5 to 2 times the unit's rated current.
• Typical: 10A 250V or 16A 250V.
• Fuses must be installed in the machine’s electrical compartment.

Power Cord

• Only the manufacturer or a qualified technician should replace a damaged cord.

Installation Clearance

• At least 10 cm between units.
• At least 200 cm between the air outlet and the ceiling.
• At least 20 cm between the rear of the machine and the wall.

Usage Precautions

Placement & Operation

• Always place the machine upright on a flat, stable surface.
• Maintain a minimum 30 cm clearance from flammable/high-temperature objects.
• Do not block the air inlet/outlet.
• Indoor use only.
• Do not use in enclosed areas such as wardrobes, closets, boats, or vehicles.
• After transport or if tilted, leave upright for at least 1 hour before powering on.

Electrical Safety

• Match power source to the rating label.
• Do not share outlets with other high-power appliances.
• Avoid impacts or drops.
• Regularly check the cord for damage.
• Plug must be secure and insulated.
• Never unplug while operating. Always turn off via control panel first.
• Before moving the unit, turn off, unplug, and empty the water tank.

Usage Precautions for the Kosmen KM-250S Industrial Dehumidifier

Things to Avoid

• Do not spray insecticides, flammable cleaners, or water directly on the unit.
• Do not expose to water or extremely humid environments.

Use Around Children & Elderly

• Can be used by children 8+ and individuals with reduced capabilities under supervision.
• Do not let children play with the device.
• Cleaning/maintenance should only be performed under supervision.

Maintenance & Repairs

• Only licensed technicians may disassemble or repair.
• Regular maintenance should be done at authorized service centers.

Fan & Compressor Operation

• Fan runs 5 seconds before compressor startup.
• Compressor stops first; fan continues for 30 seconds before stopping.

Compressor Restart Delay

• Requires 3 minutes to restart after shutting off.
• After 72 hours of continuous use, the system automatically rests for 30 minutes.

Humidity Control Range

• Adjustable between 10% – 90% RH.

Grounding

• The unit is Class I electrical equipment and must be grounded properly.
• The yellow/green wire is the ground wire – do not cut or repurpose.
• Ground resistance must meet IEC 60335-2-40 standards.
• Do not connect ground wire to:
• Water pipes
• Gas lines
• Other unreliable sources
• Improper grounding will void manufacturer responsibility.

Error Code Explanation

Troubleshooting

6. Specifications