Midea MTIU-18FNXD0 User manual

MIDDLE STATIC PRESSURE DUCT TYPE AIR CONDITIONER
Installation Manual
Middle Static Pressure Duct 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.
MTIU-18FNXD0
MOUU-18FN8-QD0

Accessories
....................................................
04
Indoor Unit Parts ........................................ 10
Indoor Unit Installation Instructions ....... 10
Safety Precautions .....................................
09
Outdoor Unit Installation......................... 15
Outdoor Unit Installation Instructions ...... 15
Outdoor Unit Types and Specifications .... 16
Notes on Drilling Hole in Wall .................... 17
Drainpipe Installation ............................... 18
Table of Contents
Installation Manual
Indoor Unit Installation ........................... 10
1
2
4
3
5
Indoor Unit Installation ........................... 07

(for R32/R290 refrigerant only )
Caution : Risk of fire
WARNING:
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. For more details ,
please refer to the section of “ Information on servicing”.
(This is only required for the unit adopts R32/R290 Refrigerant).
Refrigerant Piping Connection....................... 20
Notes on Pipe Length and Elevation .............. 20
Refrigerant Piping Connection Instructions ...22
Wiring................................................. 25
Outdoor Unit Wiring .................. 25
Indoor Unit Wiring ..................... 26
Power Specifications ................... 28
Air Evacuation.................................................. 30
Evacuation Instructions ................................ 30
Note on Adding Refrigerant ....................... 31
Test Run.............................................................................. 32
6
7
8
9
L N
MC MC
European Disposal Guidelines .................... 33
10
Information Servicing............................................. 34
11

Page 4 
1
Safety Precautions
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.
WARNING
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.
CAUTION
WARNING
1. Carefully read the Safety Precautions before installation.
2. In certain functional environments, such as kitchens, server rooms, etc., the use of
specially designed air-conditioning units is highly recommended.
3. Only trained and certied technicians should install, repair and service this air
conditioning unit.
4. Improper installation may result in electrical shock, short circuit, leaks, fire or other
damage to the equipment and personal property.
(In North America,installation must be performed in accordance with the requirement
of NEC and CEC by authorized personnel only.)
5. Strictly follow the installation instructions set forth in this manual.
6. 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.
7. 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.
(EN Standard requirements)
8. Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.
9. This appliance is not intended for use by persons(including children) with reduced
physical, sensory or mental capabilities or lack of experience and knowledge, unless
they have been given supervision or instruction concerning use of the appliance by a
person responsible for their safety.(IEC Standard requirement )
10. Children should be supervised to ensure that they do not play with the appliance..
(IEC Standard requirement )
This symbol indicates that you must never perform the action indicated.

Page 5 
WARNING
For units that have an auxiliary electric heater, do not install the unit within 1 meter (3 feet)
of any combustible materials.
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 re.
Do not
operate your air conditioner in a wet room such as a bathroom or laundry room. Too
much exposure to water can cause electrical components to short circuit.
1.
The product must be properly grounded at the time of installation, or electrical shock may occur.
2. Install drainage piping according to the instructions in this manual. Improper drainage may
cause water damage to your home and property.
CAUTION
11. If the supply cord is damaged, it must be replaced by the manufacturer,its service agent
or similarly qualied persons in order to avoid a hazard.
12. The appliance shall be installed in accordance with national wiring regulations.
13. 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.
14. The appliance disconnection must be incorporated with an all-pole disconnection
device in the xed wiring in accordance with the wiring rules.
15. 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.
16. Servicing shall only be performed as recommended by the equipment manufacturer.
17. 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.
18. The appliance shall be stored so as to prevent mechanical damage from occurring.
19. Keep ventilation openings clear of obstruction.
20. Do not turn on the power until all work has been completed.
21. When moving or relocating the air conditioner, consult experienced service technicians
for disconnection and reinstallation of the unit
22. In certain functional environments, such as kitchens, server rooms, etc., the use of
specially designed air-conditioning units is highly recommended.
23. Removal of the plug has to be such that an operator can check from any of the points to
which he has access that the plug remains removed.
24. If this is not possible, due to the construction of the appliance or its installation, a
disconnection with a locking system in the isolated position shall be provided.
25. How to install the appliance to its support, please read the information for details in
"indoor unit installation" and "outdoor unit installation".

Page 6  Page 6 
1.
Cautions for using R32/R290 refrigerant
Installation (Space)
- That the installation of pipe-work shall be kept to a minimum.
- That pipe-work shall be protected from physical damage.
- That compliance with national gas regulations shall be observed.
- That mechanical connections shall be accessible for maintenance purposes.
- In cases that require mechanical ventilation, ventilation openings shall be kept clear of
obstruction.
- When disposing of the product is used, be based on national regulations, properly processed.
-The appliance shall be stored in a well-ventilated area where the room size corresponds
to the room area as specied for operation.
-Spaces where refrigerant pipes shall be compliance with national gas regulations.
2. Servicing
- 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.
Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.
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 refrigerants may not contain an odour.
Be more careful that foreign matter(oil, water,etc) does not enter the piping. Also, when
storing the piping, securely seal the opening by pinching, taping, etc.
For indoor units, use R32 areless joint assy only when connecting the indoor unit and
connecting piping(when connecting indoors). Use of pipes, areless nut or are nuts other
than specied, may cause product malfunction, burst piping, or injury due to high internal
pressure of the refrigerant cycle caused by any inow air.
Appliance shall be installed, operated and stored in a room with a oor area larger than
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 ).
3.
4.
5.
6.
7.
8.

Table.1-1
Table.1-2
Page 7  
R32
Refrigerant
Type Installation
Height H0(m)
LFL(kg/m )
3Floor Area (m )
2
0.306
0.6
1.0
1.8
2.2
4
0.68
1.14
2.05
2.50
7
0.90
1.51
2.71
3.31
10
1.08
1.80
3.24
3.96
15
1.32
2.20
3.97
4.85
20
1.53
2.54
4.58
5.60
30
1.87
3.12
5.61
6.86
50
2.41
4.02
7.24
8.85
Max Refrigerant Charge (kg)
R32
LFL(kg/m )
3Charge Amount in kg
0.306
0.6
1.0
1.8
2.2
1.224 1.836
29
10
3
2
2.448
51
19
6
4
3.672
116
42
13
9
4.896
206
74
23
15
6.12
321
116
36
24
7.956
543
196
60
40
Min. Room Area (m )
2
Minimum Room Area ( m )
2
Refrigerant
Type Installation Height H0(m)
Note about Fluorinated Gasses
1. This air-conditioning unit contains fluorinated greenhouse gasses. For specic 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. For equipment that contains uorinated greenhouse gases in quantities of 5 tonnes of CO
equivalent or more, but of less than 50 tonnes of CO equivalent, If the system has a leak-
detection system installed, it must be checked for leaks at least every 24 months.
2
2
5.
When the unit is checked for leaks, proper record-keeping of all checks is strongly
recommended.

Page 8 
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 9 
Accessories
Accessories
2
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.
Connecting wire for display (2m)
Cord protection rubber ring
QUANTITY
SHAPENAME
Soundproof / insulation sheath 2
1
1
2
Tubing & Fittings
Others
Installation manual
1
1
Owner‘s manual
Drain joint (some models)
Seal ring (some models)
Drainpipe Fittings
(for cooling & heating)
Seal sponge (some models)
EMC Magnetic Ring
(some models)
Magnetic ring
(wrap the electric wires S1 & S2 ( P & Q & E )
around the magnetic ring twice)
Magnetic ring
(Hitch on the connective cable between the indoor
unit and outdoor unit after installation.)
1
1
Orice (some models) 1
Transfer connector(Φ12.7-Φ15.9)/
( )(Packed with the indoor unit )
NOTE: Pipe size may dier from appliance to
appliance. To meet dierent pipe size requirements,
sometimes the pipe connections need a transfer
connector installed on the outdoor unit .
Φ0.5in-Φ0.63in
Transfer connector(Φ6.35-Φ9.52)/
( )(Packed with the indoor unit)
NOTE: Pipe size may dier from appliance to
appliance. To meet dierent pipe size requirements,
sometimes the pipe connections need a transfer
connector installed on the outdoor unit .
Φ0.25in-Φ0.375in
Transfer connector(Φ9.52-Φ12.7)/
( ) (Packed with the indoor unit,
used for multi-type models only )
NOTE: Pipe size may dier from appliance to
appliance. To meet dierent pipe size requirements,
sometimes the pipe connections need a transfer
connector installed on the outdoor unit .
Φ0.375in-Φ0.5in
1
(on some models)
1
(on some models)
1
(on some models)
1(on some models)
1(on some models)
1
Optional accessories
There are two types of remote controls: wired and wireless.
Select a remote controller based on customer preferences and requirements and install in an
appropriate place.
Refer to catalogues and technical literature for guidance on selecting a suitable remote controller.
•
S1&S2(P&Q&E)
Copper nut (some models)
NOTE:Used to make the connective pipes between
indoor and outdoor units.

Unit Installation
Indoor Unit
Installation
Page 10
Indoor Unit Installation 3
Indoor Unit Parts
Fig. 3.1
WARNING
•Securely install the indoor unit on a structure
that can sustain its weight. If the structure is
too weak, the unit may fall causing personal
injury, unit and property damage or death.
• DO NOT install the indoor unit in the
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
or radios to prevent static or image
distortion. Depending on the appliances, a
1m (3.2’) distance may not be sufficient.
•If the indoor unit is installed on a metal
part of the building, it must be electrically
grounded.
Indoor Unit Installation Instructions
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 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
Fig. 3.2
Air outlet
Air inlet
Air filter(on some models)
Drain hose
Electric control cabinet
Refrigerant connecting pipe
checking orice
60cmX60cm
30cm or more
20cm or more
Maintenance roomage
√
√
√
√
√
√
Safety Precautions
Models with a cooling capacity of 9000Btu to
18000Btu only apply to one room.
√