Midea 18K User manual

Owner’s Manual &

Installation Manual

IMPORTANT NOTE:

Read this manual carefully before installing

or operating your new air conditioning

unit. Make sure to save this manual for

future reference.

AIR-HANDLER AIR CONDITIONERS

Installation Manual

Page 2 

Read This Manual

Inside you’ll find many helpful hints on how to use and maintain your air

conditioner properly. Just a little preventive care on your part can save you a great

deal of time and money over the life of your air conditioner. These instructions

may not cover every possible condition of use, so common sense and attention to

safety is required when installing, operating and maintaining this product.

Improper installation, adjustment, alteration, service or maintenance can cause

property damage, personal injury or loss of life. Installation and service must be

performed by a licensed professional HVAC installer or equivalent service agency.

WARNING

Owner’s Manual & Installation Manual

SAFETY PRECAUTIONS .................................................................................... 3

ACCESSORIES ....................................................................................................... 7

INDOOR UNIT INSTALLATION ........................................................................ 8

OUTDOOR UNIT INSTALLATION ................................................................ 30

WIRING ................................................................................................................... 33

SPECIFICATION .................................................................................................. 48

AIR EVACUATION ................................................................................................ 51

TEST RUN .............................................................................................................. 53

Page 3 

SAFETY PRECAUTIONS

To prevent injury to the user or other people and property damage, the instructions

shown here 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.

WARNING FOR PRODUCT USE

• If an abnormal situation arises (like a burning smell), immediately turn off the unit

and disconnect the power.

Call your dealer for instructions to avoid electric shock, fire or injury.

• Do not insert fingers, rods or other objects into the air inlet or outlet.

This may cause injury, since the fan may be rotating at high speeds.

• Do not use flammable sprays such as hair spray, lacquer or paint near the unit.

This may cause fire or combustion.

• Do not store gasoline or flammable substances near air conditioner.

Emitted gas may collect around the unit and cause explosion.

• Do not expose your body directly to cool air for a prolonged period of time.

• If the air conditioner is used together with burners or other heating devices,

thoroughly ventilate the room to avoid oxygen deficiency.

• In certain environments, such as kitchens, server rooms, etc., the use of specially

designed air-conditioning units is highly recommended.

• This unit is not designed for nonducted (freeblow) applications. Electric heat

strips and or blower is easily accessible without duct and presents electrocution

or injury hazard.

WARNING This symbol indicates the possibility of personnel injury or

loss of life.

CAUTION

This symbol indicates the possibility of property damage

or serious consequences.

NOTICE

This symbol addresses practices not related to physical

injury.

Safety

Precautions

WARNING FOR CLEANING AND MAINTENANCE

• Turn off the device and disconnect the power before cleaning.

Failure to do so can cause electrical shock.

• Do not clean the air conditioner with excessive amounts of water.

• Do not clean the air conditioner with combustible cleaning agents.

Combustible cleaning agents can cause fire or deformation.

Page 4 

CAUTION

• Turn off the air conditioner and disconnect the power if you are not going to use

it for a long time.

• Make sure that water condensation can drain unhindered from the unit.

• Do not operate the air conditioner with wet hands. This may cause electric shock.

• Do not use device for any other purpose than its intended use.

• Do not climb onto or place objects on top of the outdoor unit.

• As with any mechanical equipment, contact with sharp sheet metal edges can

result in personal injury. Take care while handling this equipment and wear

gloves and protective clothing.

Safety

Precautions

ELECTRICAL WARNINGS

• The product must be properly grounded at the time of installation, or electrical

shock may occur.

• For all electrical work, follow all local and national wiring standards, regulations,

and the Installation Manual. Connect cables tightly, and clamp them securely

to prevent external forces from damaging the terminal. Improper electrical

connections can overheat and cause fire, and may also cause shock. All electrical

connections must be made according to the Electrical Connection Diagram

located on the panels of the indoor and outdoor units.

• All wiring must be properly arranged to ensure that the control board cover can

close properly. If the control board cover is not closed properly, it can lead to

corrosion and cause the connection points on the terminal to heat up, catch fire,

or cause electrical shock.

TAKE NOTE OF FUSE SPECIFICATIONS

• The air conditioner’s circuit board (PCB) may be designed with a fuse to provide

overcurrent protection.

• The specifications of the fuse, if equipped, are printed on the circuit board,

examples of such are T5A/250VAC and T10A/250VAC.

Page 5 

Safety

Precautions

WARNINGS FOR PRODUCT INSTALLATION

1. Installation must be performed by an authorized dealer or specialist.

Defective installation can cause water leakage, electrical shock, or fire.

2. Installation must be performed according to the installation instructions.

Improper installation can cause water leakage, electrical shock, or fire.

(In North America, installation must be performed in accordance with the

requirement of NEC or CEC by authorized personnel only.)

3. Contact an authorized service provider for repair or maintenance of this unit.

This appliance shall be installed in accordance with national wiring regulations.

4. Only use the included accessories, parts, and specified parts for installation.

Using non-standard parts can cause water leakage, electrical shock, fire, and

can cause the unit to fail.

5. Install the unit in a firm location that can support the unit’s weight. If the chosen

location cannot support the unit’s weight, or the installation is not done properly,

the unit may drop and cause serious injury and damage.

6. Install drainage piping according to the instructions in this manual. Improper

drainage may cause water damage to your home and property.

7. Do not install the unit in a location that may be exposed to combustible gas leaks.

If combustible gas accumulates around the unit, it may cause fire.

8. Do not turn on the power until all work has been completed.

9. When moving or relocating the air conditioner, consult experienced service

provider for disconnection and reinstallation of the unit.

10. Excessive Weight Hazard - Use two or more people when moving and installing

the unit. Failure to do so can result in back or other type of injury.

NOTE ABOUT FLUORINATED GASSES (NOT APPLICABLE TO THE UNIT

USING R290 REFRIGERANT)

1. This air-conditioning unit contains fluorinated greenhouse gasses. For specific

information on the type of gas and the amount, please refer to the relevant

label on the unit itself or the “Owner’s Manual - Product Fiche” in the packaging

of the outdoor unit. (European Union products only).

2. Installation, service, maintenance and repair of this unit must be performed by

a certified technician.

3. Product uninstallation and recycling must be performed by a certified technician.

4. When the unit is checked for leaks, proper record-keeping of all checks is

strongly recommended.

Page 6 

NOTICE

The functional static pressure range of the air conditioner on site is 0-0.80 in-H2O

(0-200 Pa).

The data below represents the static pressures at full required air flow used for

AHRI testing.

NOTICE

The maximum functional total external static pressure can not exceed 0.80 in WC

or 200 Pa. The airflow reduces significantly beyond 0.80 in WC or 200 Pa.

System design should allow for the increased resistance of filters as they

become dirty.

Safety

Precautions

Model 18-24K 30-36K 48-60K

Pressure 0.10 in-H2O (25 Pa) 0.15 in-H2O (37 Pa) 0.20 in-H2O (50 Pa)

Page 7 

The air conditioning system comes with the following accessories. Use all of the

installation parts and accessories to install the air conditioner. Improper installation

may result in water leakage, electrical shock and fire, or equipment failure.

Accessories (Packed with the indoor unit)

ACCESSORIES

Accessories

NOTICE

The remote control is only used to adjust the parameters.

Accessories (Packed with the outdoor unit)

Owner’s Manual & Installation Manual

Name Shape Quantity

Remote controller

Battery

Flare-to-braze adapter

Wired remote controller

Cable ties

Flare nut

Foam

Flare-to-braze adapter

Name Shape Quantity

Drain fitting

Gasket

Page 8 

Indoor Unit

Installation

CAUTION

• Install the indoor and outdoor units,

cables and wires at least 1 m (3.2’)

from televisions or radios to prevent

static or image distortion. Depending

on the appliances, a 1 m (3.2’)

distance may not be sufficient.

• If the indoor unit is installed on metal,

it must be electrically grounded.

INDOOR UNIT INSTALLATION

Indoor Unit Parts

Safety Precautions

Indoor Unit Installation Instructions

WARNING

• Securely install the indoor unit on a

structure that can sustain its weight.

If the structure is too weak, the unit

may fall and cause personal injury,

unit and property damage, or death.

• Do not install the indoor unit in a

moist environment as excessive

moisture can short the unit and

corrode the wiring.

• Danger of explosion. Keep flammable

materials and vapors, such as

gasoline, away from air handler. Place

air handler so that heating elements

are at least 18 inches (46 cm) above

the floor for a garage installation.

Failure to follow these instructions

can result in death, explosion, or fire.

The indoor unit should be installed in

a location that meets the following

requirements:

• Enough room for installation and

maintenance.

• Enough room for the connecting

refrigerant tubing and drainpipe.

• The structure that the equipment is

suspended from must support the

weight of the indoor unit.

• Room for properly sized return and

supply duct must be maintained.



CAUTION

Do not install the unit in the following

locations:

Areas with oil drilling or fracking.

Areas with caustic gases in the air,

such as near laundry vents.

Areas with strong electromagnetic

waves.

Areas that store flammable

materials or gas.

Rooms with high humidity, such as

bathrooms or laundry rooms.

WARNING

Please apply sealant around the places

where the wires, refrigerant pipes and

condensate pipes enter the cabinet.

WARNING

Use duct tape and/or Permagum to

seal closed space around the holes

where the drain lines exit the cabinet.

Warm air must not be allowed to

enter through any gaps or holes in the

cabinet.

Upow

Horizontal drain pan

Upflow

drain

pan

Coil compartment (Access panel removed)

Horizontal drain pan

Page 9 

Recommended Distances Between the Indoor Unit

Horizontal Installations

Vertical Installations

Indoor Unit

Installation

The distance between the mounted

indoor unit should meet the specifications

illlustrated in the following diagram.

The outlet side pipe length is 1.5m/59”.

Fixing instructions: When installed

vertically (upward or downward), the

lower end of the air outlet needs to be

connected to the L-shaped metal air

duct and fastened by screws.

Plenum Clearances

MINIMUM CLEARANCE

OF 25.4mm/1″ALL SIDES

FLEXIBLE

DUCT COLLAR

1.5m/59’’

WARNING

There must be an airtight seal between the bottom of the air handler and the return

air plenum. Use fiberglass sealing strips, foil duct tape, caulking, or equivalent sealing

method between the plenum and the air handler cabinet to ensure a tight seal. Return air

must not be drawn from a room where this air handler or any gas-fueled appliance (i.e.,

water heater), or carbon monoxide-producing device (i.e., wood fireplace) is installed.

MODEL

(Btu/h) 18K~24K 30K~48K 60K

Dimensions

Length of A mm

1143 1245 1346

inch

45 49 53

Length of B mm

533 533 533

inch

21 21 21

Length of C mm

445 534 622

inch

17-1/2 21-1/50 24-1/2

Length of D mm

400 490 580

inch

15-3/4 19-5/16 22-27/32

Length of E mm

260 260 260

inch

10-1/4 10-1/4 10-1/4

Indoor parts installation size

(unit: mm/in)

Page 10 

Installation Place

Horizontal InstallationsVertical Installations

DUCT CONNECTIONS: Air supply and return may be handled in one of several ways

best place holder suited to the installation (See table for dimensions for duct inlet and

outlet connections). The vast majority of problems encountered with combination cooling

systems can be linked to improperly designed or installed duct systems. It is therefore

highly important to the success of an installation that the duct system be properly

designed and installed.

Use flexible duct collars to minimize the transmission of vibration/noise into the

conditioned space. Where return air duct is short, or where sound is could potentially to

be a problem, sound absorbing liner should be used inside the duct.

Insulation of duct work is a must where it runs through an unconditioned space during

the cooling season. The use of a vapor barrier is recommended to prevent absorption

of moisture from the surrounding air into the insulation. The supply air duct should

be properly sized by use of a transition to match unit opening. All ducts should be

suspended using flexible hangers and never fastened directly to the structure. This unit is

not designed for nonducted (freeblow) applications. Duct work should be fabricated and

installed in accordance with local and/or national codes.

NOTICE

This product filter is only used for energy efficiency sampling test, the user needs

to install a filter of their choice.

Recommended size of filter

(unit: mm/inch)

24inch(min)

30 inch (min)

24inch(min)

30 inch (min)

MODEL (Btu/h) 18K~24K 30K~48K 60K

Length of W mm

406.4 495.3 584.2

inch

16 20 23

Length of D mm

508 508 508

inch

20 20 20

Length of tmm

25.4 25.4 25.4

inch

111

Indoor Unit

Installation

Indoor Unit

Installation

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