Midea Ultimate Comfort Series User manual

CS78421-548-754
Ultimate Comfort Series
Installation Manual
MOB01-12HFN8-QRD6GWC
MOB01-09HFN8-QRD6GW
Outdoor Unit Model
Indoor Unit Model
MSMTAU-12HRFN8-QRD6GW
MSMTAU-09HRFN8-QRD6GW

Table of Contents
Installation Manual
Indoor Unit Installation........ 11
1. Select installation location..........................11
2. Attach mounting plate to wall....................
12
3. Drill wall hole for connective piping............
12
4. Prepare refrigerant piping...........................
14
5. Connect drain hose....................................
15
6. Connect the cables....................................
17
7. Wrap piping and cables..............................
18
8. Mount indoor unit.....................................
18
Outdoor Unit Installation...
20
8
1. Select installation location..................20
2. Install drain joint................................
21
3. Anchor outdoor unit..........................
22
4. Connect signal and power cables.......23
Safety Precautions........................... 4
0
1
5
6
2
4
Unit Parts..........................................10
3
Accessories........................................
Installation Summary - Indoor Unit........

Refrigerant Piping Connection........ 25
A. Note on Pipe Length................................................25
B. Connection Instructions –Refrigerant Piping............. 25
1. Cut pipe..............................................................
25
2. Remove burrs......................................................
26
3. Flare pipe ends....................................................
26
4. Connect pipes.....................................................
27
Air Evacuation................... 29
1. Evacuation Instructions...................... 29
2. Note on Adding Refrigerant...............30
Electrical and Gas Leak Checks........ 31
Test Run............................................32
European Disposal Guidelines........34
6
7
8
9
35
11
MC MC
Caut ion: Risk of fire
(for R32 refrigerant ony )
10
Servicing Information .................
Display Board, Fault Codes..............27

14
12 Quick Guide................................40
13 Display board & Fault Codes ...41
Service Documents....................42

Page 4 
Safety Precautions
Read Safety Precautions Before Installation
This symbol indicates that ignoring instructions may cause death or serious
injury.
This symbol indicates that ignoring instructions may cause moderate injury
to your person, or damage to your unit or other property.
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
CAUTION
WARNING
When connecting refrigerant piping, do not let substances or gases other than the specified
refrigerant enter the unit. The presence of other gases or substances will lower the unit’s capacity,
and can cause abnormally high pressure in the refrigeration cycle. This can cause explosion and injury.
1. Installation must be performed by an authorized dealer or specialist. Defective installation can
cause water leakage, electrical shock, or fire.
3.
Contact an authorized service technician for repair or maintenance of this unit.
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.
This symbol indicates that you must never perform the action indicated.
6.
7.
8.
9.
10.
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 flames,an operating gas appliance or an operating electric heater)
Do not pierce or burn.
Appliance shall be stored in a well -ventilated area where the room size corresponds to the
room area as specifiec for operation.
Be aware that refrigerants may not contain an odour.
NOTE: Clause 7 to 10 are required for the units adopt R32 Refrigerant.
2. Installation must be performed according to the installation instructions. Improper installation can
cause water leakage, electrical shock, or fire.

Page 5 
WARNING
12. For all electrical work, use the specified cables. 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.
13. 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.
CAUTION
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.
1. The product must be properly grounded at the time of installation, or electrical shock may occur.
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.
Compliance with national gas
regulations shall be observed.
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.
When the unit is checked for leaks, proper record-keeping of all checks is strongly recommended.
2. Install drainage piping according to the instructions in this manual. Improper drainage may cause
water damage to your home and property.
3. The appliance shall be stored so as to prevent mechanical damage from occurring.
4. Any person who is involve with working on or breaking into a refrigerant circuit should hold a
current valid certificate from an industry-accredited assessment authority, which authorizes
their competence to handle refrigerants safely in accordance with an industry recognized
assessment specification.
11. For all electrical work, follow all local and national wiring standards, regulations, and the
Installation Manual. You must use an independent circuit and single outlet to supply power.
Insufficient electrical capacity or defects in electrical work can cause electrical shock or fire.
For units that have an auxiliary electric heater, do not install the unit within 1 meter of any
combustible materials.

Name
Shape Quantity
1
1
1
(for cooling & heating
models only)
Clip anchor
Mounting plate fixing
screw ST3.9 X 25
Remote controller
Fixing screw for remote
controller holder ST2.9 x 10
Remote controller holder
Dry battery AAA.LR03
Seal
Drain joint
Mounting plate
1
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.
5
5
2
1
Optional
Parts
2
Page 6 
Timer
Boost

1
1
1
Owner’s manual
Installation manual
Remote controller
illustration
SPLIT-TYPE ROOMAIR CONDITIONER
CS78421-548-754
IMPORTANTNOTE:
Read this manual carefully beforeinstalling
or operating your new air conditioning
unit. Make sure to save this manual for
futurereference.
Owner’s Manual
Aurora Series
All Model Numbers
SPLIT-TYPE ROOMAIR CONDITIONER
CS78421-548-754
IMPORTANTNOTE:
Read this manual carefully before installing
or operating your new air conditioning
unit. Make sure to save this manual for
future reference.
Installation Manual
Aurora Series
All Model Numbers
Page 7 
Name
Shape Quantity
IMPORTANTNOTE:
Read this manual carefully before installing
or operating your new air conditioning
unit. Make sure to save this manual for
future reference.
AIR CO ND I T IO N E R
RE MO TE CON TR OL LER I L LU S T RATI O N
WARNING
2
2
Appliance shall be stored in a well -ventilated area where the room size corresponds to the
room area as specifiec for operation.
For R32 frigerant models:
Appliance shall be installed, operated and stored in a room with a floor area larger than 4m .
Appliance shall not be installed in an unvertilated space, if that space is smaller than 4m .

Page 8
Installation Summary - Indoor Unit 2
Installation
Overview
Select Installation Location
(Page 11)
Attach Mounting Plate
(Page 12)
Drill Wall Hole
(Page 12)
Determine Wall Hole Position
(Page 12)
12
3 4
12cm12cm
2.3m
15cm

Page 9 
Mount Indoor Unit
(Page 18)
STEP 8
Connect Piping
(Page 25) Connect Wiring
(Page 17)
Prepare Refrigerant
piping
(Page 14)
5 6 7
8
Installation
Overview

Page 10
Unit Parts 3
Installation
Overview
NOTE ON ILLUSTRATIONS
Illustrations in this manual are for explanatory purposes. The actual shape of your indoor
unit may be slightly different. The actual shape shall prevail.
Fig. 2.1
NOTE: The installation must be performed in accordance with the requirement of local and
national standards. The installation may be slightly different in different areas.
Wall Mounting Plate
Power Cable (Some Units)
Refrigerant Piping
Signal Cable
Remote Controller
Drainage Pipe
Louver
Remote controller Holder
(Some Units)
Functional Filter (On Front of
Main Filter - Some Units)
Front Panel
Outdoor Unit Power Cable
(Some Units)
1
2
3
4
5
6
7
8
9
10
11
（1） （2）
1
23
4
6
7
8
9
10
11
Air-break switch
3
1
2
4
5
6
7
8
11
5

Page 11
Indoor Unit Installation 4
Installation Instructions – Indoor
Unit
PRIOR TO INSTALLATION
Before installing the indoor unit, refer to the
label on the product box to make sure that the
model number of the indoor unit matches the
model number of the outdoor unit.
Step 1: Select installation location
Before installing the indoor unit, you must
choose an appropriate location. The following
are standards that will help you choose an
appropriate location for the unit.
Proper installation locations meet the
following standards:
 Good air circulation
 Firm and solid—the location will not vibrate
 Strong enough to support the weight of the
unit
 A location at least one meter from all other
electrical devices (e.g., TV, radio, computer)
DO NOT install unit in the following
locations:
Near any source of heat, steam, or
combustible gas
Near any obstacle that might block air
circulation
Near the doorway
In a location subject to direct sunlight
NOTE ABOUT WALL HOLE:
If there is no fixed refrigerant piping:
While choosing a location, be aware that you
should leave ample room for a wall hole (see
Drill wall hole for connective piping step)
for the signal cable and refrigerant piping
that connect the indoor and outdoor units.
The default position for all piping is the right
side of the indoor unit (while facing the unit).
However, the unit can accommodate piping to
both the left and right.
Indoor Unit
Installation

Page 12 
Refer to the following diagram to ensure proper distance from walls and ceiling:
Step 2: Attach mounting plate to wall
The mounting plate is the device on which you
will mount the indoor unit.
1.
Remove the screw that attaches the mounting
plate to the back of the indoor unit.
2.
Place the mounting plate against the wall
in a location that meets the standards in
the Select Installation Location step. (See
Mounting Plate Dimensions for detailed
information on mounting plate sizes.)
3.
Drill holes for mounting screws in places that:
•have studs and can support the weight of
the unit
•correspond to screw holes in the mounting
plate
4. Secure the mounting plate to the wall with
the screws provided.
5.
Make sure that mounting plate is flat against
the wall.
NOTE FOR CONCRETE OR BRICK WALLS:
If the wall is made of brick, concrete, or similar
Indoor Unit
Installation
Fig. 3.1
or more
Step 3: Drill wall hole for connective piping
You must drill a hole in the wall for refrigerant
piping, the drainage pipe, and the signal cable
that will connect the indoor and outdoor units.
1.
Determine the location of the wall hole based
on the position of the mounting plate. Refer
to Mounting Plate Dimensions on the
next page to help you determine the optimal
position. The wall hole should have a 65mm
lower angle to facilitate drainage.
2.
3. Place the protective wall cuff in the hole. This
protects the edges of the hole and will help
seal it when you finish the installation process.
CAUTION
When drilling the wall hole, make sure to
avoid wires, plumbing, and other sensitive
components.
(depending on models )core drill, drill a
hole in the wall. Make sure that the hole
is drilled at a slight downward angle, so
that the outdoor end of the hole is lower
than the indoor end by about 5mm to 7mm
drainage. (See Fig. 3.2)
15cm or more
12cm12cm or more
2.3m or more
Using a 65mm or 90mm
diameter at least, and at a slightly
. This will ensure proper water
material, drill 5mm-diameter
holes in the wall and insert the sleeve anchors.
Then secure the mounting plate to the wall
by tightening the screws directly into the clip
anchors.

Page 13 
Wall
Indoor Outdoor
mm7-5
)
Fig.3.2
MOUNTING PLATE DIMENSIONS
Different models have different mounting plates.
In order to ensure that you have ample room to
mount the indoor unit, the diagrams to the right
show different types of mounting plates along
with the following dimensions:
• Width of mounting plate
• Height of mounting plate
• Width of indoor unit relative to plate
• Height of indoor unit relative to plate
• Recommended position of wall hole (both
to the left and right of mounting plate)
• Relative distances between screw holes
Indoor Unit
Installation
Fig. 3.2
Indoor unit outline
Correct orientation of Mounting Plate
47mm( )
33mm
30mm(
30mm(
47mm(
38mm( )
Left rear wall
Left rear wall
Right rear wall
Right rear wall
Φ
NOTE: When the gas side connective pipe is
506mm
hole 65mm
886mm
177mm
304mm
89mm
169mm
hole 65mm
317mm
344mm
hole 65mm
413mm
1161mm
hole 65mm
615mm
272mm
136mm 105mm
be 90mm
16mm or more, the wall hole should

Page 14 
CAUTION
Be extremely careful not to dent or damage the piping while bending them away from the
unit. Any dents in the piping will affect the unit’s performance.
Step 4: Prepare refrigerant piping
The refrigerant piping is inside an insulating
sleeve attached to the back of the unit. You must
prepare the piping before passing it through the
hole in the wall. Refer to the Refrigerant Piping
Connection section of this manual for detailed
instructions on pipe flaring and flare torque
requirements, technique, etc.
1. Based on the position of the wall hole relative
to the mounting plate, choose the side from
which the piping will exit the unit.
2.
3.
If the wall hole is behind the unit, keep the
knock-out panel in place. If the wall hole is to
the side of the indoor unit, remove the plastic
knock-out panel from that side of the unit.
(See Fig. 3.3 ). This will create a slot through
which your piping can exit the unit. Use
needle nose pliers if the plastic panel is too
difficult to remove by hand.
Groove has been made in the knock-out
panel in order to cut it conveniently. The
size of the slot is determined by the diameter
of piping. The decorative band may be lift
after cut the panel, please press it into the
position.
•To facilitate the Refrigerant Piping
Connection process
•To facilitate Gas Leak Checks and enable
you to check for dents
5.
If existing connective piping is already
embedded in the wall, proceed directly to
the Connect Drain Hose step. If there is no
embedded piping, connect the indoor unit’s
refrigerant piping to the connective piping
that will join the indoor and outdoor units.
Refer to the Refrigerant Piping Connection
section of this manual for detailed instructions.
6. Based on the position of the wall hole
relative to the mounting plate, determine the
necessary angle of your piping.
7.
Grip the refrigerant piping at the base of the
bend.
8.
Slowly, with even pressure, bend the piping
towards the hole. Do not dent or damage the
piping during the process.
NOTE ON PIPING ANGLE
Refrigerant piping can exit the indoor unit from
four different angles:
• Left-hand side
• Left rear
• Right-hand side
• Right rear
Refer to
Fig. 3.4 for details.
Fig. 3.3
Fig. 3.4
Indoor Unit
Installation
Knock-out Panel
Decorative band
4. Use scissors to cut down the length of the
insulating sleeve to reveal about 15cm of
the refrigerant piping. This serves two
purposes:

Page 15 
Step 5: Connect drain hose
By default, the drain hose is attached to the left-
hand side of unit (when you’re facing the back
of the unit). However, it can also be attached to
the right-hand side.
1.
To ensure proper drainage, attach the drain
hose on the same side that your refrigerant
piping exits the unit.
2.
Attach drain hose extension (purchased
separately) to the end of drain hose.
3.
Wrap the connection point firmly with Teflon
tape to ensure a good seal and to prevent
leaks.
4.
For the portion of the drain hose that will
remain indoors, wrap it with foam pipe
insulation to prevent condensation.
5.
Remove the air filter and pour a small amount
of water into the drain pan to make sure that
water flows from the unit smoothly.
NOTE ON DRAIN HOSE
PLACEMENT
Make sure to arrange the drain hose
according to
Fig. 3.5.
DO NOT kink the drain hose.
DO NOT create a water trap.
DO NOT put the end of drain hose in
water or a container that will collect
water.
PLUG THE UNUSED DRAIN HOLE
To prevent unwanted leaks you must plug
the unused drain hole with the rubber plug
provided.
CORRECT
Make sure there are no
kinks or dent in drain
hose to ensure proper
drainage.
NOT CORRECT
Kinks in the drain hose
will create water traps.
NOT CORRECT
Do not place the end
of the drain hose in
water or in containers
that collect water. This
will prevent proper
drainage.
NOT CORRECT
Kinks in the drain hose
will create water traps.
Fig. 3.5
Fig. 3.6
Fig. 3.7
Fig. 3.8
Indoor Unit
Installation

Page 16 
BEFORE PERFORMING ELECTRICAL WORK, READ THESE REGULATIONS
1. All wiring must comply with local and national electrical codes, and must be installed by a
licensed electrician.
2. All electrical connections must be made according to the Electrical Connection Diagram
located on the panels of the indoor and outdoor units.
3. If there is a serious safety issue with the power supply, stop work immediately. Explain your
reasoning to the client, and refuse to install the unit until the safety issue is properly resolved.
4. Power voltage should be within 90-100% of rated voltage. Insufficient power supply can
cause malfunction, electrical shock, or fire.
5. If connecting power to fixed wiring, install a surge protector and main power switch with a
capacity of 1.5 times the maximum current of the unit.
6. If connecting power to fixed wiring, a switch or circuit breaker that disconnects all poles and
qualified technician must use an approved circuit breaker or switch.
Indoor Unit
Installation
WARNING
BEFORE PERFORMING ANY ELECTRICAL OR WIRING WORK, TURN OFF THE MAIN POWER
TO THE SYSTEM.
has a contact separation of at least (3mm) must be incorporated in the fixed wiring. The
7. Make sure to properly ground the air conditioner.
8. Every wire must be firmly connected. Loose wiring can cause the terminal to overheat,
resulting in product malfunction and possible fire.
9. Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts
within the unit.
10. If the unit has an auxiliary electric heater, it must be installed at least 1 meter away from
any combustible materials.

Page 17 
Indoor Unit
Installation
Step 6: Connect the cables
The signal cable enables communication between
the indoor and outdoor units. You must first
choose the right cable size before preparing it for
connection.
Minimum Cross-Sectional Area of
Power and Signal Cables
Rated Current of
Appliance (A)
Nominal Cross-Sectional
Area (mm²)
> 3 and ≤6 0.75
> 6 and ≤10 1
> 10 and ≤16 1.5
> 16 and ≤25 2.5
> 25 and ≤32 4
> 32 and ≤40 6
CHOOSE THE RIGHT CABLE SIZE
The size of the power supply cable, signal
cable, fuse, and switch needed is determined
by the maximum current of the unit. The
maximum current is indicated on the nameplate
located on the side panel of the unit. Refer to
this nameplate to choose the right cable, fuse,
or switch.
TAKE NOTE OF FUSE SPECIFICATIONS
The air conditioner’s circuit board (PCB) is
designed with a fuse to provide overcurrent
protection. The specifications of the fuse
1. Prepare the cable for connection:
a. Using wire strippers, strip therubber jacket
from both ends of signal cable to reveal
b. Strip the insulation from the ends of the
wires.
c. Using wire crimper, crimp u-type lugs on
the ends of the wires.
PAY ATTENTION TO LIVE WIRE
While crimping wires, make sure you clearly
distinguish the Live (“L”) Wire from other wires.
2. O pen front panel of the indoor unit.
3. Using a screwdriver, open the wire box cover
on the right side of the unit, then open the
termianl block cover. This will reveal the
terminal block.
Wire cover
Screw
Terminal block
cover
Cable clamp
WARNING
4.
Unscrew the cable clamp below the terminal
block and place it to the side.
Fig. 3.9 The Wiring Diagram is located
on the inside of the indoor unit’s
wire cover.
ALL WIRING MUST BE PERFORMED STRICTLY
IN ACCORDANCE WITH THE WIRING
DIAGRAM LOCATED ON THE INSIDE OF THE
INDOOR UNIT S WIRE COVER.
’
about 40mm of the wires inside.
are printed on the circuit board, such as:
Indoor unit: T5A/250VAC
Outdoor unit(applicalbe to units adpot
R32,T20A/250VAC(<=18000Btu/h
units)T30A/250VAC(>18000Btu/h units)
NOTE: The fuse is made of ceramic.

Page 18 
8. After checking to make sure every connection
is secure, use the cable clamp to fasten the
signal cable to the unit. Screw the cable clamp
down tightly.
9. Replace the wire cover on the front of the
unit, and the plastic panel on the back.
NOTE ABOUT WIRING
Before passing the piping, drain hose, and the
signal cable through the wall hole, you must
bundle them together to save space, protect
them, and insulate them.
1. Bundle the drain hose, refrigerant pipes, and
signal cable according to Fig. 3.10.
Indoor Unit
Space behind unit
Refrigerant piping
Drain hose
Signal wire
Insulation tape
DRAIN HOSE MUST BE ON BOTTOM
Make sure that the drain hose is at the bottom
of the bundle. Putting the drain hose at the
top of the bundle can cause the drain pan
to overflow, which can lead to fire or water
damage.
DO NOT INTERTWINE SIGNAL CABLE WITH
OTHER WIRES
While bundling these items together, do not
intertwine or cross the signal cable with any
other wiring.
2. Using adhesive vinyl tape, attach the drain
hose to the underside of the refrigerant pipes.
3. Using insulation tape, wrap the signal wire,
refrigerant pipes, and drain hose tightly
together. Double-check that all items are
bundled in accordance with Fig. 3.10.
DO NOT WRAP ENDS OF PIPING
When wrapping the bundle, keep the ends
of the piping unwrapped. You need to access
them to test for leaks at the end of the
installation process (refer to Electrical Checks
and Leak Checks section of this manual).
Step 8: Mount indoor unit
If you installed new connective piping to the
outdoor unit,do the following:
1. If you have already passed the refrigerant
piping through the hole in the wall, proceed
to Step 4.
2. Otherwise, double-check that the ends of the
refrigerant pipes are sealed to prevent dirt or
foreign materials from entering the pipes.
3. Slowly pass the wrapped bundle of refrigerant
pipes, drain hose, and signal wire through the
hole in the wall.
4. Hook the top of the indoor unit on the upper
hook of the mounting plate.
5. Check that unit is hooked firmly on mounting
by applying slight pressure to the left and
right-hand sides of the unit. The unit should
not jiggle or shift.
6. Using even pressure, push down on the
bottom half of the unit. Keep pushing down
until the unit snaps onto the hooks along the
bottom of the mounting plate.
7. Again, check that the unit is firmly mounted
by applying slight pressure to the left and the
right-hand sides of the unit.
Fig. 3.10
Indoor Unit
Installation
THE WIRING CONNECTION PROCESS MAY
DIFFER SLIGHTLY BETWEEN UNITS.
5. Facing the back of the unit, remove the plastic
panel on the bottom left-hand side.
6. Feed the signal wire through this slot, from
the back of the unit to the front.
7. Facing the front of the unit, match the wire
colors with the labels on the terminal block,
connect the u-lug and and firmly screw each
wire to its corresponding terminal.
Step 7: Pipes and cables

Page 19 
If refrigerant piping is already embedded in
the wall, do the following:
1. Hook the top of the indoor unit on the upper
hook of the mounting plate.
2. Use a bracket or wedge to prop up the unit,
giving you enough room to connect the
refrigerant piping, signal cable, and drain
hose. Refer to Fig. 3.11 for an example.
Fig. 3.11
Fig. 3.12
Move to left or right
30-50mm30-50mm
Indoor Unit
Installation
3. Connect drain hose and refrigerant piping
(refer to Refrigerant Piping Connection
section of this manual for instructions).
4. Keep pipe connection point exposed to
perform the leak test (refer to Electrical
Checks and Leak Checks section of this
manual).
5. After the leak test, wrap the connection point
with insulation tape.
6. Remove the bracket or wedge that is propping
up the unit.
7. Using even pressure, push down on the
bottom half of the unit. Keep pushing down
until the unit snaps onto the hooks along the
bottom of the mounting plate.
UNIT IS ADJUSTABLE
Keep in mind that the hooks on the mounting plate are smaller than the holes on the back of the
unit. If you find that you don’t have ample room to connect embedded pipes to the indoor unit, the
Fig. 3.12
.)
unit can be adjusted left or right by about 30-50mm depending on the model. (See