Midea MCA3U-12HRFN1-QRD0W User manual

Installation Manual
Compact Four-Way Cassette
R410a Models
R32 Models
MCA3U-12HRFN1-QRD0W
MCA3-18HRFN1-QRD0W
Indoor Unit Model
Outdoor Unit Model
MOB30U-12HFN1-QRD0W
MOB30U-18HFN1-QRD0W
MOB30U-18HFN8-QRD0W
MOB30U-12HFN8-QRD0W
MCA3-18HRFNX-QRD0W
MCA3U-12HRFNX-QRD0W
Outdoor Unit Model
Indoor Unit Model

Table of Contents
Installation Manual
1
2
3
6
Accessories ............................................. 04
Safety Precautions ............................. 05
Installation Overview ....................... 06
Page 2
4Indoor Unit Installation ........................... 07
a. Indoor Unit Parts ..............................................07
b. Indoor Unit Installation Instructions .........08
5Outdoor Unit Installation ......................... 11
c. Notes on Drilling Hole in Wall .............................13
b. Outdoor Unit Types and Specifications ..........12
a. Outdoor Unit Installation Instructions ............11
Drainpipe Installation ............................... 14

Page 3 
MC MC
7
9
10
LN
Refrigerant Piping Connection............... 16
Pressure test and evacuation...............................23
Panel Installation ..........................26
Test Run..................................29
11
12
78
..................16
8Wiring................................................. 19
a. Outdoor Unit Wiring ........................19
b. Indoor Unit Wiring .............................20
c. Power Specifications ..........................21
d. Wiring Diagram .................................21
a. Notes on Pipe Length and Elevation
b. Refrigerant Piping Connection Instructions .....17
a. Pressure Test Instructions................24
b. Evacuation Instructions ...................25
Caut ion: R isk of fire
(for R32 refrigerant ony )
14
15
16
13service info .............................30
Quick Step Installation Guide............35
Dip Switches..........................28
Service Documents............................37
Display Board, Fault Codes...............36

Page 4 
Accessories
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
Remote
controller & Its
Frame (some
models)
1
2
1
1
1
1
2
Fixing screw for remote
controller holder ST2.9 x 10
Remote controller holder
Dry battery AAA
Owner’s manual
Installation manual
Commissioning Remote Controller
Wired Controller
1
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
S1&S2(P&Q&E)
Ferrite Beads
Ferrite Beads

Page 5 
Safety Precautions
Read Safety Precautions Before Installation
potential damage or injuries is classified as either a WARNING or CAUTION.
WARNING
• Carefully read the Safety Precautions before installation.
•
• 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.
toxic and flammable and poses a serious health and safety risk.
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.
national regulations.
Failure to observe a caution may result in injury or equipment damage.
WARNING
CAUTION
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
Incorrect installation due to ignoring instructions can cause serious damage or injury. The seriousness of
Failure to observe a warning may result in death. The appliance must be installed in accordance with
conditioning units is highly recommended.
In certain functional environments, such as server rooms, etc., the use of specially designed air-
2
NOTE:Requirements for units using R32 Refrigerant.
Do not accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.
The system should not be installed in areas with ignition sources
(for example: open flames,an operating gas appliance or an operating
electric heater)
Do not pierce or burn.
The system should be installed where the room size corresponds to specific
operation.
Be aware that refrigerants may not contain an odour.

Page 6 
Installation Overview
Unit Installation
Overview
LN
123
4
5
MC MC
6
Install the indoor unit
(Page 7)
INSTALLATION ORDER
Install the outdoor unit
(Page 11)
Install the drainpipe
(Page 14)
(Page 19)
Connect the refrigerant pipes
(Page 16)
Connect the wires
ont panel
(Page 25)
Install the fr
3
78
Perform a test run
(Page 29)
9
Service
Documents
(Page 32)
Pressure test & Evacuate
(Page 23)

Page 7 
Indoor Unit Installation
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 causing personal injury, unit and
property damage or death.
• Install the indoor unit at a height of more than
CAUTION
Indoor Unit
Installation
• Install the indoor and outdoor units, cables and
to prevent static or image distortion. Depending
• If the indoor unit is installed on a metal part of the
building, it must be electrically grounded.
2.5m above the floor.
wires at least 1m from televisions or radios
on the appliances, a 1m distance may not be
4

Page 8 
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:
There is enough room for installation and
maintenance.
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.
The distance between the mounted indoor unit and the internal ceiling should meet the following specifications.
(See Fig. 4.2)
Indoor Unit
Installation
The unit is at least 1m from the nearest wall.
There is enough room for the connecting pipe and
RECOMMENDED DISTANCES BETWEEN THE INDOOR UNIT AND THE CEILING
CAUTION
DO NOT install the unit in the following locations:
In areas with oil drilling or fracking
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 areas with strong electromagnetic waves
In areas that store flammable materials or gas
Connecting point
of drain pipe
Connecting point of
refrigerant pipe
(liquid side)
Connecting point of
refrigerant pipe
(gas side)
Front panel
Ground
Ceiling
>2.5m
60cm (Ceiling hole)
A, 26cm
B, 29cm

Page 9 
Table 4.1: Distance from ceiling relative to height of indoor unit
Step 2: Hang indoor unit.
Indoor Unit
Installation
>1m
>1m
>1m
>1m
1. Use the included paper template to cut a rectangular hole in the ceiling, leaving at least 1m on all sides. The hole
Fig. 4.3
12260 290
18 260 290
4 - in s ta ll h a n g e r
B o d y
D r a in h o le
( f o r S e r v ic e )
5 4 5
5 7 0
E - p a rts b o x
4 - S c re w h o le
(fo r in s ta ll p a n e l)
MODEL Length of A mm Length of Bmm
will be 60x60cm big. Be sure to mark the areas where ceiling hook holes will be drilled.

Page 10 
NOTE: The bottom of the unit should be 10 - 18mm
(indicated in Fig. 4.6) should be half the length of the
suspension bolt or long enough to prevent the nuts from
coming off.
CAUTION
Ensure that the unit is completely level. Improper
installation can cause the drain pipe to back up into the
unit or water leakage.
Indoor Unit
Installation
Wall
Ceiling board
Main body
L
NOTE: Ensure that the indoor unit is level. The unit is
equipped with a built-in drain pump and float switch.
If the unit is tilted against the direction of condensate
flows (the drainpipe side is raised), the float switch may
malfunction and cause water to leak.
Water level
M6 x 12 Bolts
higher than the ceiling board. Generally, L
Main body
24mm
template
Cardboard installation
5. Mount the indoor unit. You will need two people to
lift and secure it. Insert suspension bolts into the unit’s
hanging holes (See Fig. 4.5).
Fig. 4. 4
Fig. 4.6
Fig. 4.5
Fig. 4.7