Master DH720 240v 20L Dehumidifier

1. How It Works

This product is a dehumidifier. It controls relative humidity by passing the air through the unit, forcing the excess moisture to condense over the cooling elements. Contact with this cold surface causes the moisture in the air to condense. This condensed water then drains safely into the water tank. The dried air then passes through the condenser where it is slightly warmed and re-enters the room at a slightly elevated temperature.

Fig. 1: Internal Components This diagram illustrates the internal workings of the dehumidifier, showing the path of air. Key components identified are: 1. Dry warmer air, 2. Condenser (warmed coil), 3. Evaporator (cold refrigerated coil), 4. Moist saturated air, 5. Water tank, 6. Compressor, 7. Motor, 8. Fan rotor.

2. Where to Position

Excess moisture will travel throughout your home, in the same way that cooking smells waft to every room in the house. For this reason, the dehumidifier should be positioned so that it can draw this moist air towards it from all over the home.

Alternatively, if you have a serious problem in one area, you can begin by positioning the dehumidifier close to this area and later moving it to a more central point.

When positioning the dehumidifier, ensure that it is placed on a level surface and that there is a minimum of 10 cm (4") of space on either side of the unit to allow for efficient airflow.

This dehumidifier is fitted with castors for extra mobility. If you move the unit, it should first be switched off and the water tank emptied.

We do not recommend the use of an extension lead, so please try to ensure that the unit is sufficiently close to a fixed mains socket. If it is necessary to use an extension lead, please ensure the diameter of the wires of the cable is at least 1 mm².

When the dehumidifier is in operation, outside doors and windows should be closed when necessary for most efficient use.

3. Before Use & Safety

⚠️ CAUTION!

These symbols on your device mean:

• ℹ️ This appliance is filled with Propane gas R290. Follow strictly the manufacturer's instruction concerning use and repairs!
• Before using the machine, read carefully the entire instruction manual.
• Do not install, operate or store the device in a room smaller than 4m².

General Cautions

• FOR INDOOR USE ONLY.
• Do not use in cabinets, closets, boats, caravans, or similar locations.
• Do not use the unit in swimming pools, washrooms, or similar wet areas.
• Leave the unit to stand for 12 hours before connecting to the mains supply after transport or when it has been tilted (e.g., during cleaning).
• Only use the unit in the upright position on a flat level surface (even during transport!) and at least 50cm from any objects.
• Do not use the unit in a potentially explosive environment containing combustible liquids, gases, or dusts.
• Do not use the appliance in the vicinity of flammable or explosive substances or fuels. Never use any paint, cleaning sprays, anti-insect sprays, or similar near the unit; this could deform the plastic or cause electrical damage.
• Ensure that there is at least 50cm between the sides of the appliance and any flammable or heating materials.
• Do not place objects on the unit or restrict air inlet/outlet.
• Avoid splashing the unit with water.
• Closely supervise any children and pets when the unit is in use.
• CHILDREN SHALL NOT PLAY WITH APPLIANCE. Cleaning and user maintenance shall not be made by children without supervision.
• Switch off and unplug the unit when not in use.
• Never leave a functioning device unsupervised.
• Do not pull the unit along by the cord.
• Avoid over-twisting, -coiling, -pulling the power cord; never use nylon or iron wire to tie the power cord.
• Make sure that the plug and socket remain visible and accessible at all times.
• Do not use extension cords.
• Never reach to retrieve the unit if it has fallen in water. In such case, immediately pull the plug. Have the unit checked before using it again.
• The appliance shall be installed in accordance with national wiring regulations.
• Do not exceed the recommended room size for max. efficiency.
• Close the doors and windows.
• Keep curtains or blinds closed during the sunniest hours of the day.
• Keep filters clean.
• Once the room has reached the desired conditions, reduce the setting for temperature and ventilation.
• Do not turn on the appliance if you have discovered damage to the appliance, cord, or plug, if the appliance is malfunctioning, or if there are signs of any other defect. Return the complete product to the vendor or to a certified electrician for inspection and/or repair. Always ask for original parts.
• The appliance (incl. cord and plug) may only be opened and/or repaired by properly authorized and qualified persons.
• Suggest sending the unit for professional maintenance periodically.
• ONLY A LICENSED PROFESSIONAL IS ALLOWED TO DISMANTLE OR MODIFY THE APPLIANCE.
• THE MACHINE IS TO BE USED ONLY FOR ITS PRESCRIBED PURPOSE. ANY OTHER USE IS DEEMED TO BE A CASE OF MISUSE. THE USER/OPERATOR, NOT THE MANUFACTURER, WILL BE LIABLE FOR ANY DAMAGE OR INJURIES OF ANY KIND CAUSED AS A RESULT OF THIS.
• Always keep the unit in a vertical position.
• Keep all foreign objects away from the air intake or output openings.
• The mains supply must conform to the specification shown on the rating plate at the back of the unit.
• If the supply cord is damaged, it must be replaced by an approved service representative or a similar qualified person in order to avoid a hazard.
• Never use the plug to start and stop the unit. Always use the switch on the control panel.
• Before moving the unit, first switch off, then unplug, and empty the water tank.
• Don't use bug sprays or other flammable cleaners on the unit.
• Never pour or spray water over the unit.
• THIS APPLIANCE IS NOT INTENDED FOR USE BY PERSONS (INCLUDING CHILDREN) WITH REDUCED PHYSICAL, SENSORY OR MENTAL CAPABILITIES, OR LACK OF EXPERIENCE AND KNOWLEDGE, UNLESS THEY HAVE BEEN GIVEN SUPERVISION OR INSTRUCTION CONCERNING USE OF THE APPLIANCE BY A PERSON RESPONSIBLE FOR THEIR SAFETY. CHILDREN SHOULD BE SUPERVISED TO ENSURE THAT THEY DO NOT PLAY WITH APPLIANCE.

Safety Relating to Refrigerant R290

• Read these warnings carefully.
• This appliance contains the refrigerant R290. R290 is a refrigerant that complies with the relevant European Directives. Never perforate the refrigerant circuit. R290 is flammable (GWP3)!
• Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.
• The appliance shall be stored in a room without continuously operating ignition sources (for example: open flames, an operating gas appliance, or an operating electric heater).
• Do not pierce or burn any of the components of the cooling circuit of the unit. Do not set light to the unit.
• The appliance shall be stored so as to prevent mechanical damage from occurring.
• Appliance should be installed, operated, and stored in a room with a floor area larger than 4m².
• Be aware that the refrigerants may not contain an odour, which means you cannot smell leaks.
• Compliance with national gas regulations shall be observed.
• Keep ventilation openings clear of obstruction.
• A warning that the appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specified for operation.
• Any person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from an industry-accredited assessment authority, which authorizes their competence to handle refrigerants safely in accordance with an industry-recognized assessment specification.
• Servicing shall only be performed on the grounds as recommended by the equipment manufacturer. Maintenance and repair requiring the assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable refrigerants.
• IMPORTANT! Do not use this unit at ambient temperatures below 5°C, to prevent the possibility of a heavily ice up evaporating coil.

4. Parts

Front (Fig. 2):

1. Control panel
2. Ambient light
3. Front plate
4. Rear plate

Rear (Fig. 3):

5. Wind flap
6. Handle
7. Air inlet / Filters
8. Water level window
9. Water tank

Fig. 2: External Front View This diagram shows the front of the dehumidifier, highlighting: 1. Control panel, 2. Ambient light, 3. Front plate, 4. Rear plate.

Fig. 3: External Rear View This diagram shows the rear of the dehumidifier, detailing: 5. Wind flap, 6. Handle, 7. Air inlet / Filters, 8. Water level window, 9. Water tank.

5. Operation

Control Panel (Fig. 4):

1. Humidity setting button
2. Working mode indicator (continuous working, humidity 40%, 50%, 60%, 70%)
3. Humidity/Temperature display
4. Timer operation indicator
5. Temperature display button
6. DRYER indicator
7. DRYER button
8. High ventilation indicator
9. Speed/Ventilation button
10. Low ventilation indicator
11. Power indicator
12. ON/OFF (power) button
13. "Full Water" indicator
14. TIMER button

Please note, the indicator in the front plate will light on in 3 different colors to reflect the ambient humidity level. By this, the user can understand immediately what the ambient humidity condition is:

• Blue light - room humidity > 70%
• Green light - room humidity 50~70%
• Red light - room humidity < 50%
• Red light flash – water full alarm

Operation Steps

1. Plug the unit into a correct mains socket. (Please refer to the rating label at the rear of the unit for correct voltage/frequency.)
2. Press ON/OFF button to turn on the unit. The compressor will start to work.
3. Press humidity setting button to set the working model you need: continuous working, humidity 40%, 50%, 60%, or 70%. The relative indicator will light on.
4. Press speed/ventilation button to set the ventilation speed, high or low. The relative indicator will light on.
5. Press the TIMER button to set the operating hour you need (1~24 hours). The display window will show the hour(s) you set as you press the TIMER button, after releasing it for 8 seconds, the display window will return to the room humidity. As the set time has been reached, the compressor will stop working automatically.
6. By pressing the "TEMP" button, the display window will show the room temperature, after releasing the button for 8 seconds, the display window will return to the room humidity.
7. DRYER function is turbo ventilation to dry the moisture in the air continuously, so it could help to dry the laundry.
8. To turn off the unit, press ON/OFF button again.
9. Pre-setting function: By pressing TIMER button but without turning on the other functions (including ON/OFF button), you can PRE-SET the time for the machine to work. For example, if you press the timer to '2', the unit will work automatically after 2 hours.

Fig. 4: Control Panel Layout This diagram provides a close-up of the control panel, showing numbered buttons and indicators.

Fig. 5: Water Tank Removal This diagram illustrates how to remove the water tank from the unit.

6. Drainage

While the water tank is full, the compressor will stop for self-protection and the water full indicator will turn into red.

To move the water tank, pull it out squarely from the unit. After emptying the water tank, place the water tank back into space. Make sure it is properly positioned, in order for the 'water full' sign to go out and your dehumidifier is operating. Please note, in case the water tank has not been positioned well, the water full indicator will turn into red.

Continuous Drainage

When the dehumidifier is operated at very high humidity levels, the water tank will require more frequent drainage. In this situation, it may be more convenient to set the unit up for continuous drainage with the following procedures:

1. Pull out the water tank (Fig. 5).
2. Connect the drain hole with a water tube of inner diameter: 11 mm. The water tube is not supplied with the unit (Fig. 6).
3. Ensure the water will always drain away freely and the tube will remain in the right place. Note! In very cold weather conditions, precautions should be taken to prevent the water tube from freezing.
4. Put the water tank back to its position.

Fig. 6: Continuous Drainage Setup This diagram shows the setup for continuous drainage, connecting a water tube to the drain hole.

7. Maintenance

Always unplug the unit from the mains before carrying out any maintenance or cleaning of the unit.

Cleaning the Body

Use a soft cloth to wipe the unit clean. Don't ever use volatile chemicals, gasoline, detergents, chemically treated clothes, or other cleansing solutions. These could possibly hurt the cabinet.

Cleaning the Filter

This dehumidifier is equipped with 2 filters (Fig. 7):

1. Anti-Dust Filter Extract the filter holder, remove the active carbon filter. Use a vacuum cleaner or tap the filter lightly for easy cleaning. If the filter is particularly dirty, use warm water with a small amount of medium strength detergent. Make sure the filter is completely dry before replacing. Do not expose the filter to sunlight.
2. Active Carbon Filter (for capturing the particles of dust suspended in the air and preventing the production of bacteria.) The active carbon filter placed under the anti-dust filter is not washable. Its life span is variable and depends on the ambient conditions where the unit is used. The filter should be checked periodically and replaced if necessary.

Fig. 7: Filter Removal This diagram shows the filters being removed: 1. Anti-dust filter, 2. Active carbon filter.

Storage

If not using the unit for an extended period of time, please:

• Turn the unit off, unplug, and tidy the AC cord.
• Completely empty the water tank and wipe it clean.
• Cover the unit and store where it will not receive direct sunlight.

8. Troubleshooting

The Unit Does Not Operate:

• Is the unit plugged in?
• Is the house electricity on?
• Is the room temperature below 5°C or above 35°C? If so, then it is out of the working range of the unit.
• Ensure the humidistat (or ON/OFF switch) is turned on.
• Check the water tank is positioned properly in the unit and it is not full.
• Make sure the air inlet and outlet are not obstructed.

The Unit Seems To Do Nothing:

• Is the filter dusty or contaminated?
• Is the air intake or outlet blocked up?
• Is the room humidity already quite low?

The Unit Seems To Do Little:

• Are too many windows or doors open?
• Is there something in the room producing lots of humidity?

The Unit Is Too Noisy:

• Check whether the unit is sitting on a level surface.

The Unit Is Leaking:

• Make sure the unit is in good shape.
• If you are not using continuous drainage, make sure the rubber plug (at the bottom of the unit) is in its position.

Error Codes on Display:

Technical Specifications

Recycling and Disposal

Environmental Protection: Please recycle any unwanted materials as opposed to disposing of them as general waste. It is recommended the original packaging is retained and used to store the product when not in use for prolonged periods of time. If this is not applicable, ensure the materials are sorted and recycled in accordance with local regulations.

Disposal of Your Old Product: Your product is designed and manufactured with high-quality materials and components which can be recycled and reused. When the symbol of a crossed-out wheeled bin is attached to a product, it means the product is covered by the European Directive 2002/96/EC. Please inform yourself about the local separate collection system for electrical and electronic products. Please act according to your local rules and do not dispose of your old product with your normal household waste. The correct disposal of your old product will help prevent potential negative consequences for the environment and human health.

Specifications Change

It is our policy to continually improve products to ensure these meet the rigours of the industry we serve. Therefore, as such we reserve the right to alter specifications, data, components & parts without prior notice.

Warranty

Please refer to the manufacturer's terms & conditions.

Important Notice

No liability will be accepted for the incorrect use of this product.

Contact Information

The Hire Supply Company

Nottingham: 0115 946 1988 | London: 0208 830 3333

Nottingham: sales@hscgroupuk.co.uk | London: sean@hscgroupuk.co.uk

Website: www.hscgroupuk.co.uk

Terms & Conditions Apply At All Time. E&OE.