Midea MOU-18FN8-QD0 User manual

CASSETTE-TYPE AIR CONDITIONER
Installation Manual
Super-Slim Four-Way Cassette
IMPORTANT NOTE:
Read this manual carefully before
installing or operating your new air
conditioning unit. Make sure to save
this manual for future reference.
MCD-18FNXD0 MOU-18FN8-QD0
MCD-24FNXD0 MOU-24FN8-QD0
MCD-36FNXD0 MOU-36FN8-QD0
MCD-48FNXD0 MOU-48FN8-RD0
MCD-55FNXD0 MOU-55FN8-RD0
MCD-36FNXD0 MOU-36FN8-RD0

Accessories .................................................... 04
Indoor Unit Parts ......................................... 09
Indoor Unit Installation Instructions ....... 10
Safety Precautions ..................................... 05
Outdoor Unit Installation ......................... 13
Outdoor Unit Installation Instructions ...... 13
Drain Joint Installation ........................................ 15
Notes on Drilling Hole in Wall .................... 15
Drainpipe Installation ............................... 16
Table of Contents
Installation Manual
Indoor Unit Installation ........................... 09
Installation Overview ............................... 08
1
2
5
3
4
6
Indoor Unit Installation ........................... 07

Page 3 
Refrigerant Piping Connection....................... 18
Notes on Pipe Length and Elevation .............. 18
Refrigerant Piping Connection Instructions ...20
Wiring................................................. 23
Outdoor Unit Wiring ................... 23
Indoor Unit Wiring ...................... 24
Power Specifications ................... 25
Air Evacuation ................................................. 27
Evacuation Instructions ................................ 27
Note on Adding Refrigerant ....................... 28
Panel Installation ............................................................................................... 29
Test Run....................................................................................................................... 31
MC MC
7
8
9
10
11
L N
European Disposal Guidelines ....................................................... 32
12
Impedance Information ............................................................................ 32
13
Information servicing ............................................................................ 34
14
(for R32/R290 refrigerant only )
Caution : Risk of fire

Page 4 
Accessories 1
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 cause the equipment to fail.
Name Shape Quantity
Indoor unit
installation Installation paper template (some models) 1
Refrigeration
Fittings Soundproof/insulation sheath (some models) 1
Drainpipe
Fittings
Outlet pipe sheath (some
models) 1
Outlet pipe clasp (some
models) 1
Drain joint (some models) 1
Seal ring (some models) 1
Installation
Accessory (some
models)
Ceiling hook 4
Suspension bolt 4
Orifice tube (some units) 1
EMC Magnetic
Ring (some
models)
Remote
controller & Its
Frame (some
models)
others
Magnetic ring (wrap the
electric wires S1 & S2
( P & Q & E ) around
the magnetic ring twice)
Magnetic ring (Hitch it on
the connective cable
between indoor unit and
outdoor unit after
installation.)
1
1
1
2
1
1
1
1
2
——
——
——
Remote controller
Fixing screw for remote
controller holder ST2.9 x 10
Remote controller holder
Dry battery AAA
Owner’s manual
Installation manual
Remote controller illustration
S1&S2(P&Q&E)

Page 5 
Safety Precautions 2
Read Safety Precautions Before Installation
Incorrect installation due to ignoring instructions can cause serious damage or injury.
The seriousness of potential damage or injuries is classified as either a WARNING or CAUTION.
Failure to observe a warning may result in death. The appliance must be installed in
accordance with national regulations.
Failure to observe a caution may result in injury or equipment damage.
WARNING
CAUTION
•An all-pole disconnection device which has at least 3mm clearances in all poles , and have a
leakage current that may exceed 10mA, the residual current device (RCD) having a rated residual
operating current not exceeding 30mA, and disconnection must be incorporated in the xed
wiring in accordance with the wiring rules.
•The appliance shall be stored so as to prevent mechanical damage from occurring.
WARNING
• Carefully read the Safety Precautions before installation.
• In certain functional environments, such as kitchens, server rooms, etc., the use of specially
designed air-conditioning units is highly recommended.
• This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they have been
given supervision or instruction concerning use of the appliance in a safe way and understand
the hazards involved. Children shall not play with the appliance. Cleaning and user
maintenance shall not be made by children without supervision.
• Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.
• Only trained and certified technicians should install, repair and service this air
conditioning unit.
Improper installation may result in electrical shock, short circuit, leaks, fire or other damage to
the equipment and personal property.
• Strictly follow the installation instructions set forth in this manual.
Improper installation may result in electrical shock, short circuit, leaks, fire or other damage to
the equipment.
•Before you install the unit, consider strong winds, typhoons and earthquakes that might aect
your unit and locate it accordingly. Failure to do so could cause the equipment to fail.
•After installation, ensure there are no refrigerant leaks and that the unit is operating properly.
Refrigerant is both toxic and flammable and poses a serious health and safety risk.

Page 6  Page 6 
Amount of refrigerant
to be charged (kg) maximum installation
height (m) Minimum room area (m²)
≤2.048 2.2m 4
2.048-3.0 2.2m 4
>3.0 2.2m 5
Model
(Btu/h)
≤30000
30000-48000
>48000
WARNING
•
•
Any person who is involved with working on or breaking into a refrigerant circuit should hold a
current valid certicate from an industry-accredited assessment authority, which authorises their
competence to handle refrigerants safely in accordance with an industry recognised assessment
specication.
•
•
• Servicing shall only be performed as recommended by the equipment manufacturer.
Maintenance and repair requiring the assistance of other skilled personnel shall be carried out
under the supervision of the person competent in the use of ammable refrigerants.
Appliance shall be stored in a well-ventilated area where the room size corresponds to the room
area as specied for operation.
The appliance disconnection must be incorporated with an all-pole disconnection device in the
xed wiring in accordance with the wiring rules.
•
• The appliance shall be stored in a room without continuously operating ignition sources
(for example: open ames, an operating gas appliance or an operating electric heater).
• Do not pierce or burn.
•
•
Be aware that the refrigerants may not contain an odour.
Compliance with national gas regulations shall be observed.
• The appliance shall be stored so as to prevent mechanical damage from occurring.
• Keep ventilation openings clear of obstruction.
NOTE: The following informations are required for the units adopt R32/R290 Refrigerant.
Appliance shall be installed, operated and stored in a room with a oor area larger than X m²,
installation of pipe-work shall be kept to a minimum X m²(Please see the following form ).
The appliance shall not be installed in an unventilated space, if that space is smaller than X m²
(Please see the following form ).Spaces where refrigerant pipes shall be compliance with
national gas regulations.

Note about Fluorinated Gasses
1. This air-conditioning unit contains fluorinated gasses. For specific information on the type of gas
and the amount, please refer to the relevant label on the unit itself.
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. If the system has a leak-detection system installed, it must be checked for leaks at least every 12
months.
5.
When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended.
CAUTION
CAUTION
CAUTION
This symbol shows that a service personnel should be handling this
equipment with reference to the installation manual.
This symbol shows that information is available such as the operating
manual or installation manual.
This symbol shows that this appliance uses a ammable refrigerant. If the
refrigerant is leaked and exposed to an external ignition source, there is a
risk of re.
This symbol shows that the operation manual should be read carefully.
WARNING
CAUTION
  Page 7 
Explanation of symbols displayed on the indoor unit or outdoor unia
(applicable to the unit adopts R32/R290 Refrigerant only):

Installation
Overview
Installation Overview 3
L N
123
MC MC
4
5
6
78
Install the indoor unit
(Page 9)
INSTALLATION ORDER
Install the outdoor unit
(Page 12) Install the drainpipe (Page 15)
Connect the wires
(Page 22) Connect the refrigerant pipes (Page 19)
Evacuate the refrigeration system
(Page 25)
Install the front panel
(Page 27) Perform a test run (Page 29)
Page 8  

Page 9 
Indoor Unit
Installation
Indoor Unit Installation 4
Indoor Unit Parts
Drain pump
(within indoor unit)
Drain pipe
Air outlet
Air inlet
Display panel
Front grille
Louver
Refrigerant pipe
Fig. 4.1
Safety Precautions
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.
•Install the indoor unit at a height of more
than 2.5m (8’) above the floor.
• DO NOT install the indoor unit in a
bathroom or laundry room as excessive
moisture can short the unit and corrode
the wiring.
CAUTION
•Install the indoor and outdoor units, cables,
and wires at least 1m (3.2’) from televisions
and radios to prevent static or image
distortion. Depending on the appliances,
a 1m (3.2’) distance may not be sucient.
•If the indoor unit is installed on metal,
it must be electrically grounded.

Page 10
Indoor Unit
Installation
Table 4.1: Distance from ceiling relative to height of indoor unit
MODEL Length of A (mm/inch) Length of H (mm/inch)
18 205/8 > 235/9.3
24 205/8 > 235/9.3
30 205/8 > 235/9.3
30-48 245/9.6 > 275/10.8
48-60 287/11.3 > 317/12.5
Indoor Unit Installation Instructions
NOTE: Panel installation should be done after
piping and wiring.
Step 1: Select installation location
The indoor unit should be installed in a location
that meets the following requirements:
The unit is at least 1m (39”) from the nearest
wall.
There is enough room for installation and
maintenance.
There is enough room for the connecting
pipe and drainpipe.
The ceiling is horizontal and its structure
can sustain the weight of the indoor unit.
The air inlet and outlet are not impeded.
The airflow can fill the entire room.
There is no direct radiation from heaters.
CAUTION
DO NOT install the unit in the following
locations:
In areas with oil drilling or fracking
In coastal areas with high salt content in the air
In areas with caustic gases in the air, such
as near hot springs
In areas with power fluctuations, such as
factories
In enclosed spaces, such as cabinets
In kitchens that use natural gas
In areas with strong electromagnetic waves
In areas that store flammable materials or
gas
In rooms with high humidity, such as
bathrooms or laundry rooms
RECOMMENDED DISTANCES BETWEEN THE INDOOR UNIT AND THE CEILING
The distance between the mounted indoor unit and the internal ceiling should meet the following
specifications. (See Fig. 4.2) Connecting point
of drain pipe Connecting point of
refrigerant pipe
(liquid side)
Connecting point of
refrigerant pipe
(gas side)
Front panel
Ground
Ceiling board
>2.5m / 8.2’
88cm / 34.5” (Ceiling hole)
Ceiling
Fig. 4.2