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
1
Remote controller
1
2
2
1
2
Battery
Flare-to-braze adapter
Wired remote controller
Cable ties
2
Flare nut
4
Foam
2
Flare-to-braze adapter
Name Shape Quantity
1
1
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.
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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.
Or
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)
A
B
C
E
D

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)
W
D
t
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