ECOFLEX MINI VRF R32 SERIES High Static Indoor Unit Owner's Manual

Model Numbers

• MHD-056CS
• MHD-071CS
• MHD-080CS
• MHD-090CS
• MHD-112CS
• MHD-125CS
• MHD-140CS
• MHD-160CS

Important Safety Information

CAUTION:

The system is charged with flammable refrigerant. Safety checks are necessary to ensure that the risk of ignition is minimised.

01. Preface

Dear users,

Thank you for purchasing and using our product. Please read this manual carefully before you install, use, maintain or troubleshoot this product so that you can familiarize yourself with the product and use it correctly.

For Outdoor Units or other Indoor Units, please refer to the applicable installation & owner's manuals provided with them. For detailed operation of auxiliary control devices, such as wired, remote and centralized controllers, please refer to their instructions.

• To ensure the correct installation and operation of the product, the following instructions are provided.
• To ensure the correct and safe operation of the product, please strictly follow the requirements listed in this manual.
• All figures and contents in this manual are for reference only. Due to continuing product improvement, the specifications are subject to change without notice.
• Regular cleaning and maintenance of the product are required for intended performance and long service life. Each year before using the air conditioner, please contact your local dealer, and they will assign professionals to provide paid services of cleaning, maintenance, and inspection.
• Please retain this manual for future reference.

02. Safety Warning

Please thoroughly read and ensure that you fully understand the safety precautions (including the signs and symbols) in this manual, and follow relevant instructions during use to prevent damage to health or property.

Warning Symbol Descriptions:

• WARNING: This symbol shows that this appliance used a flammable refrigerant. If the refrigerant is leaked and exposed to an external ignition source, there is a risk of fire.
• CAUTION: This symbol shows that the operation manual should be read carefully.
• CAUTION: This symbol shows that a service personnel should be handling this equipment with reference to the installation manual.
• ℹ️ CAUTION: This symbol shows that information is available such as the operating manual or installation manual.

02.01. Warning Signs

Different marks are used to indicate the levels of hazard severity. Please follow the instructions and ensure safe operation:

• ❗ DANGER: Failure to observe the warning will result in severe personal injury or death.
• ⚠️ WARNING: Failure to observe the warning could result in severe personal injury or death, property damage, or electrical or fire hazards.
• ? CAUTION: Failure to observe the warning could result in minor personal injury, product or property damage, or other unsafe situations.
• ℹ️ NOTE: Useful operation and maintenance information.

Warning Contents:

• Ensure Proper Grounding

Prohibition Signs:

• ?? No Flammable Materials
• ?⚡ No Strong Current
• ?? No Open Fire
• ?? No Acid or Alkali Materials

Other Symbols:

• Professional Only: Indicates work should only be performed by qualified personnel.

02.02. Safety Precautions

❗ DANGER: During thunderstorms, disconnect the main power switch. Otherwise, lightning may damage the unit.

In the event of refrigerant leakage, smoking and open flames are prohibited. Disconnect the main power switch immediately, open windows to allow ventilation, keep away from the leakage point, and contact your local dealer or technical support to request a professional repair.

⚠️ WARNING: Air conditioner installation must comply with local standards and electrical codes, and relevant instructions in this manual.

• Do not use any liquid cleanser, liquefied cleanser, or corrosive cleanser to wipe this unit or spray water or other liquids on the unit. Otherwise, the plastic parts of the unit will become damaged and an electrical shock may occur. Disconnect the main power switch before cleaning and maintenance to avoid accidents.
• Ask a professional to remove and reinstall the air conditioner. Ask a professional for maintenance and repair assistance.
• This air conditioner is classified as an “appliance which is not accessible to the general public”.
• The Indoor Unit shall be placed at a height not accessible to children, at least 2.3m above the ground.

? CAUTION: 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 the appliance.
• The units are partial unit air conditioners, complying with partial unit requirements of this International Standard, and must only be connected to other units that have been confirmed as complying to corresponding partial unit requirements of this International Standard.

02.03. Electric Safety Requirements

⚠️ WARNING:

• The air conditioner shall be installed according to the local wiring specifications. Wiring work must be completed by qualified electricians.
• All wiring work must comply with electrical safety specifications.
• The air conditioner must be well grounded. Specifically, the main switch of the air conditioner must have a reliable grounding cable.
• Before contacting wiring devices, cut off all the power supplies.
• The user MAY NOT disassemble or repair the air conditioner. Doing so can be dangerous. In the event of a fault, immediately cut off the power and contact your local dealer or technical support.
• A separate power supply that meets the rated parameter values must be provided for the air conditioner.
• The fixed wiring to which the air conditioner is connected must be equipped with a power cut-off device that meets the wiring requirements.
• To avoid danger, a damaged power cable must be replaced by professionals from the maintenance department or a similar department of the manufacturer.
• The air conditioner's circuit board (PCB) is designed with a fuse to provide overcurrent protection. The specifications of the fuse are printed on the circuit board.
• NOTE: For the units with R32 refrigerant, only the blast-proof ceramic fuse can be used.

? CAUTION:

• Always ground the main power switch.
• Under no circumstances should the earth wires of the power supply system be disconnected.
• Do not use a damaged power cable and replace it if it is damaged.
• When the air conditioner is used for the first time or is in a power-off state for a long time, it needs to be connected to the power supply and warmed up for at least 12 hours before use.

02.04. Appendix

⚠️ WARNING: The following applies to R32 refrigerant systems.

• Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimised.
• For repair to the refrigerating system, the following precautions shall be complied with prior to conducting work on the system.
• Work shall be undertaken under a controlled procedure so as to minimise the risk of a flammable gas or vapour being present while the work is being performed.
• All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out. Work in confined spaces shall be avoided. The area around the workspace shall be sectioned off. Ensure that the conditions within the area have been made safe by control of flammable material.
• The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of potentially flammable atmospheres.
• Ensure that the leak detection equipment being used is suitable for use with flammable refrigerants, i.e. non-sparking, adequately sealed or intrinsically safe.
• If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equipment shall be available to hand. Have a dry powder or CO2 fire extinguisher adjacent to the charging area.
• No person carrying out work in relation to a refrigeration system which involves exposing any pipe work that contains or has contained flammable refrigerant shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion.
• All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during which flammable refrigerant can possibly be released to the surrounding space.
• Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no flammable hazards or ignition risks. "No Smoking" signs shall be displayed.
• Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere.
• Where electrical components are being changed, they shall be fit for the purpose and to the correct specification. At all times the manufacturer's maintenance and service guidelines shall be followed. If in doubt consult the manufacturer's technical department for assistance.
• The following checks shall be applied to installations using flammable refrigerants:
• The charge size is in accordance with the room size within which the refrigerant containing parts are installed.
• The ventilation machinery and outlets are operating adequately and are not obstructed.
• If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of refrigerant, which may corrode refrigerant containing components, unless the components are constructed of materials which are inherently resistant to being corroded or are suitably protected against being so corroded.
• Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures.
• If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solution shall be used. This shall be reported to the owner of the equipment so all parties are advised.
• Initial safety checks shall include:
• That capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking.
• That no live electrical components and wiring are exposed while charging, recovering or purging the system.
• That there is continuity of earth bonding.
• During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon prior to any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply to equipment during servicing, then a permanently operating form of leak detection shall be located at the most critical point to warn of a potentially hazardous situation.
• Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered in such a way that the level of protection is affected. This shall include damage to cables, excessive number of connections, terminals not made to original specification, damage to seals, incorrect fitting of glands, etc.
• Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the ingress of flammable atmospheres.
• Replacement parts shall be in accordance with the manufacturer's specifications.
• Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use.
• Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmosphere. The test apparatus shall be at the correct rating.
• Replace components only with parts specified by the manufacturer. Other parts may result in the ignition of refrigerant in the atmosphere from a leak.
• Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. The check shall also take into account the effects of ageing or continual vibration from sources such as compressors or fans.
• When breaking into the refrigerant circuit to make repairs – or for any other purpose – conventional procedures shall be used. However, it is important that best practice is followed.
• Since flammability is a consideration. The following procedure shall be adhered to:
• Remove refrigerant.
• Purge the circuit with inert gas.
• Evacuate.
• Purge again with inert gas.
• Open the circuit by cutting or brazing.
• The refrigerant charge shall be recovered into the correct recovery cylinders. The system shall be "flushed" with OFN to render the unit safe. This process may need to be repeated several times. Compressed air or oxygen shall not be used for this task.
• Flushing shall be achieved by breaking the vacuum in the system with OFN and continuing to fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down to a vacuum.
• This process shall be repeated until no refrigerant is within the system. When the final OFN charge is used, the system shall be vented down to atmospheric pressure to enable work to take place.
• This operation is absolutely vital if brazing operations on the pipe-work are to take place.
• Ensure that the outlet for the vacuum pump is not close to any ignition sources and there is ventilation available.
• Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimise the amount of refrigerant contained in them.
• Prior to recharging the system it shall be pressure tested with OFN.

DD.12 Decommissioning:

1. Become familiar with the equipment and its operation.
2. Isolate system electrically.
3. Before attempting the procedure ensure that:
   • Mechanical handling equipment is available, if required, for handling refrigerant cylinders.
   • All personal protective equipment is available and being used correctly.
   • The recovery process is supervised at all times by a competent person.
   • Recovery equipment and cylinders conform to the appropriate standards.
4. Pump down refrigerant system, if possible.
5. If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.
6. Make sure that cylinder is situated on the scales before recovery takes place.
7. Start the recovery machine and operate in accordance with manufacturer's instructions.
8. Do not overfill cylinders. (No more than 80% volume liquid charge).
9. Do not exceed the maximum working pressure of the cylinder, even temporarily.
10. When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off.
11. Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.

• Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The label shall be dated and signed. Ensure that there are labels on the equipment stating the equipment contains flammable refrigerant.
• When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all refrigerants are removed safely.
• When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge are available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i.e. special cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure relief valve and associated shut-off valves in good working order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
• The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of flammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working order. Hoses shall be complete with leak-free disconnect couplings and in good condition. Before using the recovery machine, check that it is in satisfactory working order, has been properly maintained and that any associated electrical components are sealed to prevent ignition in the event of a refrigerant release. Consult manufacturer if in doubt.
• The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant Waste Transfer Note arranged. Do not mix refrigerants in recovery units and especially not in cylinders.
• If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that flammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to returning the compressor to the suppliers. Only electric heating to the compressor body shall be employed to accelerate this process. When oil is drained from a system, it shall be carried out safely.
• Warning: disconnect the appliance from its power source during service and when replacing parts.
• These units are partial unit air conditioners, complying with partial unit requirements of this International Standard, and must only be connected to other units that have been confirmed as complying to corresponding partial unit requirements of this International Standard.

03. Operation Precautions

⚠️ WARNING:

• If the unit will be not used for a long time, disconnect the main power switch. Otherwise, an accident may occur.
• The installation height of the air conditioner shall be at least 2.3m above the ground to avoid the following risks:
  1. Touching of moving or live parts, such as fans, motors, or louvers, by a non professional. Running parts may cause harm to you or transmission assemblies may become damaged.
  2. Getting too close to the air conditioner may reduce the level of comfort.
• When the product is used with a burning appliance, the room must be ventilated regularly. Otherwise, it may cause an insufficient oxygen supply.
• Do not let children play with the air conditioner. Otherwise, an accident may occur.
• Do not expose the Indoor Units or controller to moisture or water as this may cause short circuiting or fire.
• Do not place any appliance that uses an open flame in the direct air supply of the air conditioner as it could interfere with the combustion of the appliance.
• Do not use or store flammable gases or liquids such as natural gas, hair spray, paint or gasoline near the air conditioner. Otherwise, a fire may occur.
• To avoid causing harm, do not place animals or plants directly in front of the air conditioner's air supply.
• In the event of abnormal conditions such as abnormal noise, smell, smoke, temperature rise, and electric leakage, please cut off the power immediately, and then contact your local dealer or air conditioner customer service center. Do not repair the air conditioner by yourself.
• Do not place flammable sprayers near the air conditioner or spray it directly at the air conditioner. Otherwise, a fire may occur.
• Do not place a container of water on the air conditioner. If immersed in water, the air conditioner's electrical insulation will weaken, resulting in electrical shock.
• After long-term use, confirm whether the installation platform has become worn. If it is worn, the unit could fall, causing injury.
• Do not operate the switch with wet hands, as this may result in electric shock.
• When servicing the air conditioner, be sure to turn off the air conditioner and cut off the power supply. Otherwise, the high-speed operation of the internal fan will cause injury.
• The air conditioner cannot be used to preserve food, animals and plants, precision instruments and works of art, etc.; otherwise, quality degradation could occur.
• Do not use fuses like iron or copper wire other than those with the specified capacity. Otherwise, a malfunction or fire may occur. The power supply must use the special circuit of the air conditioner at the rated voltage.
• Do not place valuables under the air conditioner. Air conditioner condensation problems may damage the valuables.
• When the air conditioner needs to be moved and re-installed, please entrust the local dealer or a professional technician to operate it.

? CAUTION:

• To use the unit normally, please follow the "Operation" section in this manual. Otherwise, the internal protection may be triggered, the unit may begin to drip, or the unit's cooling and heating effects may be impacted.
• The room temperature should be set properly, especially when there are elderly, children, or patients in the room.
• Lightning or the starting and stopping of large electrical equipment in nearby factories may cause misoperation of the air conditioner. Please turn off the main power switch for a few seconds, and then restart the air conditioner.
• To avoid accidental resetting of the thermal circuit breaker, the air conditioner cannot be powered by an external switching device such as a timer or connected to a circuit that is turned on and off by a common component timer.
• Check whether the air filter is installed properly. Confirm that the inlet and outlet ports of the Indoor Unit/Outdoor Unit are not blocked.
• If the air conditioner will not be used for a long time, please clean the air filter before you start the air conditioner. Otherwise, dust and mold on the filter could contaminate the air or produce an unpleasant odor. For more details, please refer to the section "Cleaning and Maintenance".
• When using the air conditioner for the first time or replacing the filter, complete the following settings on the controller:
  1. Reset the initial static pressure on the controller or perform a trial run on the Outdoor Unit (performed by the installer), and set the current state as a reference state for the unit to determine the filter state. (For details, see the Application Control section)
  2. Set the difference between the initial resistance and the final resistance of the filter. (For details, see the wired controller manual.)
• If the above operations are not performed, then the unit may not detect the state of the filter accurately.

04. Optimum Operation

As cold air sinks and hot air rises, adjust the direction of louvers respectively in cooling and heating modes to ensure good cooling and heating effects. Use the following method to regulate the air outlet assembly (optional).

04.01. In Cooling Mode

To improve the cooling effect in the entire room, adjust the louvers of the air outlet grille horizontally.

? CAUTION: Cooling in the downward outlet state may cause condensation on the air outlet and guide louver surface.

04.02. In Heating Mode

To improve the heating effect in the lower parts of a room, adjust the louvers of air outlet grille downwards.

? CAUTION: To maintain good performance, operate the air conditioner under the following temperature conditions:

? CAUTION: The Indoor Unit operates stably within the temperature range given in the table above. If it exceeds this normal operating range, the Indoor Unit may stop running and display an error code.

05. Symptoms That Are Not Faults

05.01. Normal Protection of the Air Conditioner

During operation, the following phenomena are normal and do not require maintenance.

• Protection: When the power switch is on, if you start the system right after it is stopped, it is normal that the Outdoor Unit does not operate for about four minutes as frequent compressor start/stop is not supported.
• Anti-cold air protection (Heat pump type): In heating mode (including heating in automatic mode), when the indoor heat exchanger does not reach a certain temperature, the indoor fan temporarily shuts off, or runs in Low mode until the heat exchanger heats up to prevent the blowing of cold air.
• Defrosting (Heat pump type): When the outdoor temperature is low and the humidity is high, the Outdoor Unit's heat exchanger may become frosted, which may reduce the heating capacity of the air conditioner. If this occurs, the air conditioner will stop heating, enter automatic defrosting mode, and return to heating mode after defrosting has been completed. During the defrosting, the outdoor fan stops running and the indoor fan runs using the anti-cold air protection function. The defrosting operation time varies depending on the outdoor temperature and the degree of frosting. It generally takes 2 to 10 minutes. During the defrosting process, the Outdoor Unit may emit steam due to the rapid defrosting, which is normal.

05.02. Normal Phenomena that Are Not Air Conditioner Faults

• The Indoor Unit emits white mist:
  1. In an environment where the indoor relative humidity is too high, when the Indoor Unit runs in cooling mode, white mist may appear due to the humidity and the temperature difference between the air inlet and outlet.
  2. When the air conditioner is switched to heating mode after defrosting, the Indoor Unit discharges the moisture generated from defrosting as steam.
• The Indoor Unit blows dust: When the air conditioner has not been used for a long time or is used for the first time, the air filter should be cleaned. Otherwise, dust that has entered the Indoor Unit will be blown out.
• The Indoor Unit emits odor: The Indoor Unit absorbs the odors of rooms, furniture or cigarettes, etc., and disperses the odors during operation. It is advised to have the air conditioner cleaned and maintained regularly by professional technicians.
• Water drips on the air conditioner surface: When the indoor relative humidity is high, it is normal for condensation or slight water blowing to occur on the surface of the air conditioner.
• "Self-cleaning" sound of icing: During self-cleaning, there may be a slight clicking sound for about 10 minutes, indicating that the Indoor Unit is freezing, which is normal.
• The air conditioner makes low noise:
  1. When the air conditioner is in "Auto", "Cool", "Dry", and "Heat" modes, it may emit a low continuous "hissing" sound, which is caused by the refrigerant flowing between the Indoor Unit and the Outdoor Unit.
  2. A "hissing" sound may be heard for a short time after the air conditioner stops operation or during "defrosting", which is caused when the refrigerant stops flowing or changes its flow.
  3. When the air conditioner is in Cool mode or Dry mode, a small and continuous rustling sound can be heard, which is caused by the drain pump.
  4. When the air conditioner starts or stops running, you may hear a squeaking sound which is produced by the expansion or shrinkage of parts or surrounding aesthetic materials due to temperature change. The sound will disappear when the air conditioner is running normally.
• Switching from cooling/heating (not available for cooling only units) mode to fan only mode: When the Indoor Unit reaches the set temperature, the air conditioner controller automatically stops the compressor operation and switches to the fan only mode. When the room temperature rises (in cooling mode) or falls (in heating mode) to a certain level, the compressor is restarted and cooling or heating operation is resumed.
• In winter, the outdoor temperature is low, and heating effects may be decreased:
  1. During the heating operation of the heat pump type air conditioner, the air conditioner absorbs heat from the outdoor air and releases it to heat the indoor air. This is the heat pump heating principle of the air conditioner.
  2. When the heat pump runs in heating mode, the Outdoor Unit blows out cold air, causing the outdoor temperature to drop. When the outdoor temperature is extremely low, the heating capability of the air conditioner drops gradually. You are advised to use other heating devices for heating.
• Mode conflict: All Indoor Units in the same air conditioning system can only operate in the same mode, for example, cooling, heating or others. If Indoor Units are in different modes, a conflict will occur, making the system unable to start. Make sure that all the Indoor Units operate in the same mode.
• No heating or cooling permissions: For the same air conditioning system, if the outdoor unit operates in changeover mode, the wired controller of the priority indoor unit allows users to select modes supported by the indoor units, while the wired controllers of other indoor units displays the icon of "No permission". In this case, other indoor units can only operate in the same mode as the priority indoor unit.

06. Display Box

The display box shows operational status and error codes.

06.01. Display functions:

1. In Standby mode, the main interface displays "---".
2. When starting up in Cooling or Heating mode, the main interface displays the set temperature. In Fan mode, the main interface displays the indoor temperature. In Dry mode, the main interface displays the set temperature, and when the humidity* is set, the set humidity value is displayed on the wired controller.
3. The light display on the main interface can be turned on or off through the light button on the remote controller.
4. When the system fails or runs in a special mode, the main interface displays the error code or the special mode running code. For details, see the section "Error Codes and Meanings".

? CAUTION: Humidity* : The humidity control functions is customized. Some display functions are available only for certain Indoor Unit and Outdoor Unit models, wired controllers, and display boxes. For more information, please consult your local dealer or technical support.

NOTE: Wireless controller can be purchased as an optional accessory that can be purchased from ActronAir or your local dealer.

07. Cleaning, Maintenance and After-Sales Service

07.01. Safety Warning

⚠️ WARNING:

• For safety reasons, always turn off the air conditioner and turn off the power before cleaning the air conditioner.
• Do not disassemble or repair the air conditioner by yourself; otherwise, it may cause fire or other hazards.
• Only professional service personnel can carry out the maintenance.
• Do not use flammable or explosive materials (such as hair styling agents or pesticides) near the product.
• Do not use organic solvents such as paint thinner to clean this product; otherwise, it may cause cracks, electric shock or fire.
• Only qualified dealers and professionally qualified electricians can install the optional accessories.
• Be sure to use the optional accessories specified by the company.
• Improper installation by yourself may result in water leakage, electric shock or fire.
• Do not wash the air conditioner with water; otherwise, it may cause an electric shock.
• Use a stable standing platform.

07.02. Cleaning and Maintenance

07.02.01. Cleaning the Air Filter

? CAUTION:

• Air filters are optional.
• Air filters can be used to remove dust or other particles from the air, and if clogged, the effectiveness of the air conditioner will be greatly reduced.
• Therefore, be sure to clean the air filter frequently when using it for an extended period.
• For the Indoor Unit with constant speed mode, if it is installed in a place with a lot of dust, it is recommended that you clean the filter once a month. For Indoor Units with a constant air flow mode, clean the filter when you receive the reminder of the wired controller.
• If excess dirt makes the filter difficult to clean, replace the filter.
• Do not remove the air filter unless it is being cleaned; otherwise, it may cause malfunction.

Procedure of cleaning the Air Filter:

1. Remove the air inlet grille. For duct type air conditioners, open the air inlet grille as shown in the figure.
2. Loosen the screws on the filter and remove the filter.

NOTES: Only professionals can change and disassemble the filter. Any improper operations may cause electric shock or injuries due to touching rotating parts.

3. Clean the filter.
   • Clean the filter with a vacuum cleaner, with the air inlet side of the filter facing upwards.
   • Clean the filter with clean water (except for the activated carbon module), with the air inlet side of the filter facing downwards.

? CAUTION:

• To avoid deformation of the filter, do not use fire or a burning appliance to dry the filter.
• If the filter is heavily soiled, use a soft brush and neutral detergent to clean it, then shake off the water and dry it in a cool place.
• Non-professionals should not disassemble, replace or repair the filter.

4. Reinstall the filter.
5. Reinstall and close the air inlet grille by following steps 1 and 2 above in reverse.

07.02.02. Cleaning Air Outlets and Exterior Panels

Wipe the air outlet and panel with a dry cloth.

If a stain is hard to remove, clean it with clean water or neutral detergent.

? CAUTION:

• Do not use gasoline, benzene, volatile agents, decontamination powder or liquid insecticides. Otherwise, the air outlet or panel may become discolored or deformed.
• Do not expose the inside of the Indoor Unit to moisture, as it may result in electric shock or fire.
• When cleaning the louver with water, do not scrub it violently.
• If the air conditioner is used without an air filter, the accumulation of dust in the air conditioner will often cause malfunctions due to the failure to remove dust from the indoor air.

07.02.03. Maintenance

During in-depth maintenance, the air conditioner should be cleaned and maintained by professional technicians every 2 to 3 years.

For the Indoor Unit in constant speed mode, the primary efficiency filter is usually cleaned every three months. When operating in a dusty environment, the air flow and capacity of the filter will decrease. The filter may even become blocked, and the air conditioner performance and indoor air compromised.

Preheat the unit in advance.

When the heating season comes, power on the Outdoor Unit master unit for preheating more than 4 hours before use. The preheating time depends on the weather temperature. This can make the air conditioner operate more stably and help the refrigeration oil in the air conditioner compressor to maintain the best lubrication state, which can prolong the service life of the compressor.

Complete the following steps before the air conditioner is put out of use for a long period:

1. If the air conditioner is not in use for a long time due to seasonal changes, keep the unit running for 4-5 hours in fan mode until the unit becomes completely dry. Otherwise, it may grow mold indoors and have negative health effects.
2. When not in use for a long time, power off or unplug the power plug to reduce standby power consumption, and wipe the wireless remote controller with a clean soft dry cloth and remove the battery.
3. Turn on the power switch 12 hours before using the air conditioner again. In addition, in seasons when air conditioners are frequently used, keep the power switch on. Otherwise, failures may occur.

? CAUTION:

• Before the air conditioner is idle for a long time, the internal components of the Outdoor Units should be checked and cleaned regularly. For more details, please contact the local air conditioner customer service center or special technical service department.
• Check the return air inlet and outlet of the Outdoor Unit and Indoor Unit after long periods of use to see if they are blocked; if an inlet/outlet is blocked, clean it immediately.
• Wooden buildings, newly renovated houses, and frequent use of disinfectants may contain acidic components in the air, such as formic acid, acetic acid, and hypochlorous acid, which can corrode copper pipes and solder joints, leading to refrigerant leaks.
• Factories, chemical plants, livestock farms, vegetable markets, sewage pits, and other environments may contain sulfides, acid gases such as sulfur dioxide, ammonia, and chlorides in the air, which can corrode copper pipes and solder joints, leading to refrigerant leaks.
• These places may cause corrosion to the copper pipes and joints of the indoor unit, and it is necessary to have a professional inspection every six months.

07.03. Maintenance of Conventional Parts

07.03.01. Step To Dismantle The Drain Pan

The drain pan must first be removed during the maintenance of the internal unit assembly. Dismantle the drain pan according to the following schematic to prevent water leakage in the unit (Make sure there is no residual water in the drain pan before you dismantle it).

Step 1: Dismantle the top cover plate assembly.

Step 2: Remove the drain pan assembly in a downward direction.

[Diagram: Shows dismantling of top cover plate and removal of drain pan assembly]

07.03.02. Step To Dismantle The Fan Casing

Step 1: Remove the return air support and return air cover (First, remove the filter if any).

Step 2: Remove the three screws, plate the approximately 30 degrees, as shown in the figure.

Step 3: Remove the lower propeller housing in a downward diagonal direction.

Step 4: Loosen the screws on the upper propeller housing.

[Diagram: Shows steps for dismantling fan casing]

Step 5: Move the upper propeller housing 50mm.

Step 6: Make the propeller housing rotate more than 90° downward along the wind wheel.

Step 7: Remove the upper fan casing.

Step 8: Installation notes: The slot and latch bolt, and the limiting groove and side wall edge should be aligned first, and then be fastened; Check whether the limiting groove, positioning rod and buckle are installed in place, and the limiting latch bolt shall enclose the outside of the fan casing.

[Diagram: Shows further steps for dismantling fan casing and notes on alignment]

07.03.03. Step To Dismantle The Motor And Wind Wheel

Step 1: Remove the return air support and return air cover (First, remove the filter if any).

Step 2: Remove the three screws, plate the approximately 30 degrees, as shown in the figure.

[Diagram: Shows steps for dismantling motor and wind wheel]

Step 3: Press the buckle of the upper fan casing, and rotate the lower fan casing around the front edge of the lower fan casing by about 30 degrees.

Step 4: Loosen the four M5 screws on the motor holder and the fastening screws for the fan.

Step 5: Remove the motor and wind wheel together.

[Diagram: Shows further steps for dismantling motor and wind wheel]

07.03.04. Step To Dismantle The Drain Pump, Temperature Sensor And Electronic Expansion Valve

Step 1: Remove the electric control box cover and unplug the pump and water level switch.

Step 2: Remove the pipe clamp board.

Step 3: Remove and repair the drain pump assembly.

Step 4: Replace temperature sensor and electronic expansion valve.

[Diagram: Shows steps for dismantling pump, sensor, and valve]

07.03.05. Step To Dismantle The Main Control Board

Step 1: Remove the electric control box cover.

Step 2: Check the circuit, components and other problems or replace the main control board.

Step 3: After replacing the main control board, use the after-sale tool to scan the QR code on the electric control box, and reset the model and horsepower of the unit.

NOTES: The electric control boards of different Indoor Units are not interchangeable.

07.03.06. Step To Dismantle The Motor Shaft And Coupling (model with 3 fans)

Step 1: Remove the return air support and return air cover (first, remove the filter if any).

Step 2: Refer to the maintenance previous of fan casing to remove the lower fan casing located at the side with a coupling and loosen the fastening screws on the coupling.

Step 3: Push the coupling toward the wind wheel.

Step 4: Remove the wind wheel, connecting shaft and coupling together.

Step 5: Loosen the fastening screws for the wind wheel and remove the coupling and motor shaft.

[Diagram: Shows steps for dismantling motor shaft and coupling]

07.03.07. Step To Dismantle The Bearing Block (Model With 3 Fans)

Step 1: Remove the return air support and return air cover (first, remove the filter if any).

Step 2: Refer to the motor shaft service procedure and remove the fan, connecting shaft, and coupling.

Step 3: Loosen the two M5 screws attached to the middle cross member and the two M3.9 screws attached to the side panel and remove the bearing holder.

[Diagram: Shows steps for dismantling bearing block]

08. Disposal

Components and accessories from the units are not part of ordinary domestic waste.

Complete units, compressors, motors etc. are only to be disposed of via qualified disposal specialists.

This unit uses hydrofluorocarbon which is only to be disposed of via qualified disposal specialists.