Midea MAD22C3WMT Installation and maintenance instructions

Dehumidifier
www.midea.com
USER MANUAL
en
MDP
Warning notices: Before
using this product, please
read this manual carefully
and keep it for future
reference.
The design and
specifications are subject to
change without prior notice
for product improvement.
Consult with your dealer or
manufacturer for details.
Rated voltage: 115V
Frequency: 60Hz
Free 3 months
extension of the
original limited warranty
period!*Simply text a
picture of your proof of
purchase to:
1-844-224-1614
*The warranty extension is for the three months
immediately following
the completion of the product’s original warranty
period. Individuals do not need to register the
product in order to get all the rights and remedies
of registered owners under the original limited
warranty.
MAD22C3WMT
MAD30C3WMT
MAD50C3WMT
Version A – 01-2023

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Read This Manual
Inside you will find many helpful hints on how to use and maintain your dehumidifier
properly. Just a little preventive care on your part can save youagreat deal of time
and money over the life of your dehumidifier. You’ll find many answers to common
problems in the troubleshooting tips - you should be able to fix most of them quickly
before calling service. These instructions may not cover every possible condition of
use, so common sense and care for safety is required when installing, operating and
maintaining this product.
• Contact an authorized service technician for repair or maintenance of this unit.
• The unit is not designed to be used by young children or people with reduced
physical, sensory or mental capabilities without supervision.
• Young children should be supervised to ensure that they do not play with the unit.
• If the power cord needs to be replaced, please contact our consumer service or an
authorized technician.
• Electrical installation, if needed, must be performed in accordance to national
regulation standards by qualified personnel only.
Owner’s Manual
1
2
3
4
5
6
CAUTION
Safety Precautions ............................................................................ 3
Unit Specifications and Features ................................................... 12
Operating Instructions ..................................................................... 13
Installation Instructions ................................................................... 19
Care and Cleaning ........................................................................... 20
Troubleshooting Tips ....................................................................... 21
7Warranty ........................................................
22
and Return Policy ...

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Safety Precautions
CAUTION
WARNING
Safety
Precautions
To prevent injury to the user or personal and property damage, these instructions must
be followed. Incorrect operation due to ignoring of instructions may cause harm or
damage. The level of risk is shown by the following indications.
• Plug in power plug properly.
Otherwise, it may cause electric shock or fire due to excess heat generation.
• Do not modify power cord length or share the outlet with other appliances.
It may cause electric shock or fire due to overheating.
• Always ensure effective grounding.
Incorrect grounding may cause electric shock.
• Unplug the unit if strange sounds, smells, or smoke come from it.
A damaged product may cause fire and electric shock.
• Ventilate room before operating the unit if there is a gas leak from other appliances.
• Do not operate or stop the unit by inserting or pulling out the power plug.
It may cause electric shock.
• Do not allow water to enter into electric parts.
It may cause failure or electric shock.
• Do not use the power outlet if it is loose or damaged.
It may cause fire and electric shock.
• Do not use or keep the power cord close to heating appliances or heat sources
such as fireplaces.
It may cause fire and electric shock.
• Do not disassemble or modify unit.
It may cause failure and electric shock.
• Do not damage or use an unspecified power cord.
It may cause fire and electric shock.
• If the power cord is damaged, it must be replaced by the manufacturer or an
authorized service center or a similarly qualified person in order to avoid electrical risk.
• Do not use the unit near flammable gas or combustibles, such as gasoline,
benzene, thinner, etc.
It may cause fire.
• Before cleaning, turn off the power and unplug the unit.
• Do not remove the water bucket during operation, the bucket full protection may
be activated and risk electric shock.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to property.
WARNINGS

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CAUTIONS
• Do not use the unit in small spaces.
Lack of ventilation can cause overheating and fire.
• Do not use in places where water may splash onto the unit.
Water may enter the unit and degrade the insulation. It may cause an electric
shock or fire.
• Place the unit on a level, sturdy section of the floor.
If the unit falls over, it may cause water to spill and damage belongings, or cause
electrical shock or fire.
• Never insert your finger or other foreign objects into grids or openings. Take
special care to warn children of these dangers.
It may cause failure or electric shock.
• Do not climb up on or sit on the unit.
You may be injured if you fall or if the unit falls over.
• Always insert the filters securely, and take caution to avoid injuries to hand and
fingers. Clean filter once every two weeks.
• If water enters the unit, turn the unit off and disconnect the power, contact a
qualified service technician.
• Do not place flower vases or other water containers on top of the unit.
Water may spill inside the unit, causing insulation failure and electrical shock or fire.
• If the unit is knocked over during use, turn off the unit and unplug it from the
main power supply immediately. Visually inspect the unit to ensure there is no
damage. If you suspect the unit has been damaged, contact customer service or
a qualified technician.
• In a thunderstorm, the power should be disconnected to the unit due to lightning.
• Do not run power cord under carpeting. Do not cover cord with throw rugs,
runners, or similar coverings. Do not route cord under furniture or appliances.
Arrange cord away from traffic area and where it will not be tripped over.
Safety
Precautions

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Safety
Precautions
AVERTISSEMENTS - For your safety
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity
of this or any other appliance.
• Avoid fire hazard or electric shock. Do not use an extension cord or an adaptor
plug. Do not remove any prongs from the plug.
WARNING - Electrical Information
• The manufacture's nameplate is located on the rear panel of the unit and
contains electrical and other technical data specific to this unit.
• Be sure the unit is properly grounded. To minimize shock and fire hazards,
proper grounding is important. The power cord is equipped with a three-prong
grounding plug for protection against shock hazards.
• Your unit must be used in a properly grounded wall receptacle. If the wall
receptacleyou intend to use is not adequately grounded or protected by a
time delay fuse or circuit breaker, have a qualified electrician install the proper
receptacle.
• Ensure the receptacle is accessible after the unit installation.
• To avoid the possibility of personal injury, always disconnect the the unit from
power supply, before installing and/or servicing.
CAUTION:
Risk of fire
flammable materials
FOR R32 REFRIGERANT MODEL
IMPORTANT NOTE:Read this manual
carefully before installing or operating
your new air conditioning unit. Make sure
to save this manual for future reference.
A2L
ISO 817
North America Products

Safety Precautions
WARNING：
Explanation of symbols displayed on the unit
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.
CAUTION
This symbol shows that information is available such as the operating manual or
installation manual.
-Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance
supervision and repair requiring the assistance of other skilled personnel shall be carried out under
theof the person competent in the use of flammable refrigerants.
-DO NOT modify the length of the power cord or use anextension cord to power the unit.
-DO NOT share a single outlet with other electrical appliances. Improper power supply can cause fire
or electrical shock.
-Please follow the instruction carefully to handle, install, clear, service the air conditioner to avoid any
damage or hazard.
Flammable
Refrigerant R32 is used within air conditioner.
-When maintaining or disposing the air conditioner, the refrigerant (R32) shall be recovered properly,
shall not discharge to air directly.
-Compliance with national gas regulations shall be observed.
-Keep ventilation openings clear of obstruction.
-The appliance shall be stored so as to prevent mechanical damage from occurring.
-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 shouldhold a
current valid certificate from an industry-accredited assessment authority, which authorises their
competence to handle refrigerants safely in accordance with an industry recognised assessment
specification.
Examples for such working procedures are:
•breaking into the refrigerating circuit;
•opening of sealed components;
•opening of ventilated enclosures.
-No any open fire or device like switch which may generate spark/arcingshall be around air
conditioner to avoid causing ignition of the flammable refrigerant used. Please followthe instruction
carefully to store or maintain the air conditioner to prevent mechanical damage from occurring.
-Do not use means to accelerate the defrosting process or to clean, other than thoserecommended
by the manufacturer.
-The appliance shall be stored in a room without continuously operating ignition sources (for
example: open flames, an operating gas appliance) and ignition sourcesor (for example: anoperating
electric heater) close to the appliance. 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.
-Be aware that the refrigerants may not contain an odour.
AVERTISSEMENT
Ne pas utiliser de produits permettant d accélérer le dégel ou de produits de nettoyage autres que
ceux recommandés par le fabricant.
L’appareil doit être entreposé dans un endroit sans source d allumage fonctionnant en continu
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Safety Precautions
(par exemple : flamme nue, appareil au gaz en marche ou radiateur électrique en marche).
Ne pas percer ni bruler. Attention : les frigorigènes peuvent être inodores.
1.Transport of equipment containing ammable refrigerants
See transport regulations.
2.Marking of equipment using signs
See local regulations.
3.Disposal of equipment using ammable refrigerants
See national regulations.
4.Storage of equipment/appliances
The storage of equipment should be in accordance withthe manufacturer's instructions.
5.Storage of packed (unsold) equipment
Storage package protection should be constructed such that mechanical damage to the equipment
inside the package will not cause a leak of the refrigerant charge. The maximum number of pieces
of equipment permitted to be stored together will be determined by local regulations.
6.Information on servicing
1) Checks to the area
Prior to beginning work on systems containing flammablerefrigerants,safety checks are
necessary to ensure that the risk of ignition is minimised. For repair to the refrigeratingsystem,
the following precautions shall be complied with prior to conducting work on the system.
2) Work procedure
Work shall be undertaken under a controlled procedure so as to minimise the risk of a
flammable gas or vapour being present whilethe work is being performed.
3) General work area
All maintenance staff and others workinginthe local area shall be instructed on the nature of
work being carried out. Work inconfined spaces shall be avoided.Thearea around the
workspace shall be sectioned off. Ensure that the conditions within the area have been made
safe by control of flammable material.
4) Checking for presence of refrigerant
The area shall be checked with an appropriate refrigerating 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 suitablefor use withflammable refrigerants, i.e.
non-sparking, adequately sealed or intrinsically safe.
5) Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts,
appropriate fire extinguishing equipment shall be availableto hand. Have a dry powder or CO2
fire extinguisher adjacent to the charging area.
6) No ignition sources
No person carrying out work in relation to a refrigerating 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 ignitionsources,
including cigarette smoking, should be kept suffciently far away from the site of installation,
repairing, removing and disposal, during whichflammable refrigerant can possibly bereleased
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.
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Safety Precautions
7) ventilated area
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 ventilationshall 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.
8) Checks to the refrigerating equipment
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
befollowed. If in doubt consult the manufacturer's technical department for assistance. The
following checks shall be applied to installations using flammablerefrigerants:
The actual refrigerant charge is in accordancewiththe room size within whichtherefrigerant
containing parts are installed; The ventilation machinery and outlets areoperating adequately
and are not obstructed; If an indirect refrigerating circuit is being used, the secondary circuit
shall be checked for the presence of refrigerant; Marking to the equipment continues to be
visible and legible. Markings and signs that are illegible shall be corrected; Refrigerating pipe or
components are installed in a position where they are unlikely to be exposed to any substance
which may corrode refrigerant containingcomponents, unless the components are constructed
of materials which are inherently resistant to beingcorroded or are suitably protected against
being so corroded.
9) Checks to electrical devices
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 tocontinue operation, an adequate
temporary solution shall be used. This shall be reported to theowner 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 there no live electrical components and wiring are exposed while charging, recovering or
purging the system; That there is continuity of earth bonding.
7.Repairs to sealed components
1) During repairs to sealed components, all electrical supplies shall bedisconnected 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, thena permanently
operating form of leak detection shall be located at the most critical point to warn of a
potentially hazardous situation.
2) 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 apparatus is
mounted securely.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.
NOTE: The use of silicon sealant may inhibit the effectiveness of sometypes of leak detection
equipment. Intrinsically safe components do not have to be isolated prior to working on them.
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Safety Precautions
8.Repair to intrinsically safe components
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 livein 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.
9. Cabling
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
aging or continual vibration from sources such as compressors or fans.
10.Detection of ammable refrigerants
Under no circumstances shall potential sources of ignition be used in the searching for or
detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall
not be used.
The following leak detection methods are deemed acceptable for systems containing
flammable refrigerants. Electronic leak detectors shall be used to detect flammable refrigerants,
but the sensitivity may not be adequate, or may need re-calibration. (Detection equipment shall
be calibrated in a refrigerant-free area). Ensure that the detector is not a potential source of
ignition and is suitable for the refrigerant used. Leak detection equipment shall be set at a
percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed and
the appropriate percentage of gas (25 % maximum) is confirmed. Leak detectionfluids are
suitable for use with most refrigerants but the use of detergents containing chlorine shall be
avoided as the chlorine may react withthe refrigerant and corrode the copper pipe-work. If a
leak is suspected, all naked flames shall be removed/extinguished. If a leakage of refrigerant is
found which requires brazing, all of the refrigerant shall be recovered from the system, or
isolated (by means of shut off valves) in a part of the systemremote from the leak. Removal of
refrigerant shall be according to Removal andevacuation.
11.Removal and evacuation
When breaking into the refrigerant circuit to make repairs – or for any other purpose–
conventional procedures shall be used. However, for flammable refrigerants it is important that
best practice be followed, since flammability is aconsideration. The following procedure shall
be adhered to:
a) safely remove refrigerant following local and national regulations;
b) purge the circuit with inert gas;
c) evacuate (optional for A2L);
d) purge with inert gas (optional for A2L); e) open the circuit by cuttingor brazing.
The refrigerant charge shall be recovered into the correct recovery cylinders if ventingis not allowed
by local and national codes. For appliances containing flammable refrigerants, the system shall be
purged with oxygen-free nitrogen to render the appliance safe for flammable refrigerants. This
process might need to be repeated several times. Compressed air or oxygen shall not be used for
purging refrigerant systems. For appliances containing flammablerefrigerants, refrigerants purging
shall be achieved by breaking the vacuum in the system with oxygen-free nitrogen and continuing
to fill until the working pressure is achieved, then ventingto atmosphere, and finally pulling down
to a vacuum (optional for A2L). This process shall be repeated until no refrigerant is within the system
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Safety Precautions
(optional for A2L). When the final oxygen-free nitrogen charge is used, the system shall be vented
down to atmospheric pressure to enable work totake place. Ensure that the outlet for the vacuum
pump is not close to any potential ignition sources and that ventilation is available.
12.Charging procedures
In addition to conventional charging procedures, the following requirements shall be followed.
Ensure that contamination of different refrigerants does not occur when using charging equipment.
Hoses or lines shall be as short as possible to minimisethe amount of refrigerant contained in them.
Cylinders shall be kept in an appropriate position according to the instructions. Ensure that the
refrigeration system is earthed prior to charging the system with refrigerant. Label the system when
charging is complete (if not already). Extreme care shall be taken not to overfill the refrigeration
system. Prior to recharging the system it shall be pressure tested with OFN. The system shall be leak
tested on completion of charging but prior to commissioning. A followup leak test shall becarried
out prior to leaving the site.
13.Decommissioning
Before carrying out this procedure, it is essential that the technician is completely familiar with the
equipment and all its detail. It is recommended good practicethat all refrigerants are recovered
safely.Prior to the task being carried out, an oil and refrigerant sample shall be taken incase analysis
is required prior to re-use of reclaimed refrigerant. It is essential that electrical power is available
before the task is commenced.
a) Become familiar with the equipment and its operation.
b) Isolate system electrically.
c) Before attempting the procedure ensure that: Mechanical handling equipment is available, if required,
for handling refrigerant cylinders; All personal protective equipment is available and beingused
correctly; The recovery process is supervised at all times by acompetent person; Recovery equipment
and cylinders conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts
of the system.
f) Make sure that cylinder is situated on the scales before recovery takesplace.
g) Start the recovery machine and operate in accordance withinstructions.
h) Do not overfill cylinders. (No more than 80 % volumeliquidcharge).
i) Do not exceed the maximum working pressure of the cylinder, even temporarily.
j) 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.
k) Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned
and checked.
14.Labelling
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.
15.Recovery
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
intocylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that
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