Midea MUE-18FNXD0 User manual

CEILING & FLOOR TYPE AIR CONDITIONER
Installation Manual
Ceiling & Floor Type
IMPORTANT NOTE:
Read this manual carefully before
installing or operating your new air
conditioning unit. Make sure to save
this manual for future reference.
MUE-36FNXD0 MOU-36FN8-RD0
MUE-48FNXD0 MOU-48FN8-RD0
MUE-55FNXD0 MOU-55FN8-RD0
MUE-36FNXD0 MOU-36FN8-QD0
MUE-18FNXD0 MOU-18FN8-QD0
MUE-24FNXD0 MOU-24FN8-QD0
MUE-30FN1D0
MOU-30FN1-QD0

Accessories .................................................... 04
a. Indoor Unit Parts ........................................ 09
b. Indoor Unit Installation Instructions ....... 10
Safety Precautions ..................................... 05
Outdoor Unit Installation ......................... 11
a. Outdoor Unit Installation Instructions ..... 14
b. Outdoor Unit Types and Specifications ... 15
c. Notes on Drilling Hole in Wall .................... 16
Drainpipe Installation ............................... 17
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...................... 19
A. Notes on Pipe Length and Elevation ............... 19
B. Refrigerant Piping Connection Instructions ... 21
Wiring................................................. 23
a. Outdoor Unit Wiring ................... 23
b. Indoor Unit Wiring ...................... 24
c. Power Specifications .................... 25
Air Evacuation ................................................ 27
a. Evacuation Instructions ............................... 27
b. Note on Adding Refrigerant ...................... 28
Test Run.......................................................................................... 29
30
MC MC
7
8
9
10
L N
(R32/R290 refrigerant )
C au t i o n: Risk of fire
European Disposal Guidelines .......................................................
11
Information servicing...................................................................... 31
12

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 re, or equipment failure.
Name Shape Quantity
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
EMC Magnetic
Ring (some
models)
Remote
controller & Its
Frame (some
models)
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
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.
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.

Page 6  Page 6 
Amount of refrigerant
to be charged (kg) maximum installation
height (m) Minimum room area (m²)
≤2.048 1.8m 4
≤2.048 0.6m 35
2.048-3.0 1.8m 8
2.048-3.0 0.6m 80
>3.0 1.8m 9
>3.0
Model
(Btu/h)
≤30000
≤30000
30000-48000
30000-48000
>48000
>48000 0.6m 80
WARNING
• 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.
• 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.
• Appliance shall be stored in a room without continuously operating open ames (for example
an operating gas appliance) and ignition sources (for example an operating electric heater).
• 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.
• The appliance shall be stored so as to prevent mechanical damage from occurring.
•
• Be aware that the refrigerants may not contain an odour.
• Keep ventilation openings clear of obstruction.
Compliance with national gas regulations shall be observed.
• A warning that the appliance shall be stored in a well-ventilated area where the room size
corresponds to the room area as specied for operation.

Note about Fluorinated Gases
1. This air-conditioning unit contains fluorinated gases. 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
Explanation of symbols displayed on the indoor unit or outdoor unia
(applicable to the unit adopts R32/R290 Refrigerant only):
Page 7  

Page 8 
Unit Installation Overview
Installation Overview 3
L N
123
4
5
MC MC
6
7
Install the indoor unit
(Page 10)
INSTALLATION ORDER
Install the outdoor unit
(Page 14) Install the drainpipe (Page 17)
Evacuate the refrigeration
system (Page 27) Connect the wires
(Page 24) Connect the refrigerant
pipes (Page 19)
Perform a test run
(Page 29)

Page 9 
Indoor Unit
Installation
Air inlet Display panel
Air outlet
grille
Louver
Installation part
Indoor Unit Installation 4
Indoor Unit Parts
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.
• 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
Indoor Unit Installation Instructions
NOTE: Panel installation should be performed
after piping and wiring have been completed.
Step 1:Select installation location
The indoor unit should be installed in a location
that meets the following requirements:
Enough room exists for installation and
maintenance.
Enough room exists for the connecting the
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 blocked.
The airflow can fill the entire room.
There is no direct radiation from heaters.
CAUTION
DO NOT install the unit in the following
Areas with oil drilling or fracking
Coastal areas with high salt content in the
air
Areas with caustic gases in the air, such as
hot springs
Areas that experience power uctuations,
such as factories
Enclosed spaces, such as cabinets
Kitchens that use natural gas
Areas with strong electromagnetic waves
Areas that store flammable materials or gas
Rooms with high humidity, such as
bathrooms or laundry rooms
RECOMMENDED DISTANCES BETWEEN THE INDOOR UNIT
The distance between the mounted indoor unit should meet the specications illlustrated in the
following diagram. (See Fig. 4.2)
Fig. 4.2
≥35mm
≥1000mm
≥ 35mm ≥ 35mm
locations: