Midea MCD-18HRFN1-QRD0 User manual

Installation Manual
Super-Slim Four-Way Cassette
R410a Models
R32 Models
MCD-18HRFN1-QRD0
MCD-24HRFN1-QRD0
MCD-30HRFN1-QRD0
MCD-36HRFN1-QRD0
MCD-48HRFN1-QRD0
MCD-55HRFN1-QRD0
Indoor Unit Model
Outdoor Unit Model
MOB30U-18HFN1-QRD0
MOCA30U-24HFN1-QRD0
MOD30U-30HFN1-QRD0
MOD30U-36HFN1-QRD0
MOE30U-48HFN1-QRD0
MOE30U-55HFN1-QRD0
MOB30U-18HFN8-QRD0
Outdoor Unit Model
Indoor Unit Model
MCD-18HRFNX-QRD0
MCD-24HRFNX-QRD0
MCD-30HRFNX-QRD0
MCD-36HRFNX-QRD0
MCD-55HRFNX-QRD0
MCD-48HRFNX-QRD0
MOCA30U-24HFN8-QRD0
MOD30U-30HFN8-QRD0
MOD30U-36HFN8-QRD0
MOE30U-48HFN8-RRD0
MOE30U-55HFN8-RRD0

Table of Contents
Installation Manual
1
2
5
3
4
6
Outdoor Unit Installation ......................... 11
Accessories ............................................. 04
Safety Precautions ............................. 05
Installation Overview ....................... 06
Page 2
Indoor Unit Installation ........................... 07
a. Indoor Unit Parts ..............................................07
b. Indoor Unit Installation Instructions .........08
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
13
14
15
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
13 service info ............................30
Display Board, Fault Codes...............36
Service Documents............................37
Dip Switches..........................28
Quick Step Installation Guide............35

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
78
Install the indoor unit
(Page 7)
Install the outdoor unit
(Page 11)
Install the drainpipe
(Page 14)
(Page 16)
Connect the wires
ont panel
(Page 26)
98
Connect the refrigerant pipes
(Page 19)
3
INSTALLATION ORDER
Install the fr Perform a test run
(Page 29)
Pressure test & Evacuate
(Page 23)
Service Documents
(Page 32)

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
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.
4
• Install the indoor and outdoor units, cables and
wires at least 1m from televisions or radios
on the appliances, a 1m distance may not be

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)
Connecting point
of drain pipe
Connecting point of
refrigerant pipe
(liquid side)
Connecting point of
refrigerant pipe
(gas side)
Front panel
Ground
Ceiling board
Ceiling
Fig. 4.2
Indoor Unit
Installation
The unit is at least 1m from the nearest wall.
>2.5m
88cm (Ceiling hole)
RECOMMENDED DISTANCES BETWEEN THE I NDOOR 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
There is enough room for the connecting pipe and

Page 9 
Table 4.1: Distance from ceiling relative to height of indoor unit
Step 2: Hang indoor unit.
Indoor Unit
Installation
Refrigerant piping side
Drain hose side
>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
will be 88x88cm big. Be sure to mark the areas where ceiling hook holes will be drilled.
78cm (Suspension bolt)
84cm(Body)
95cm (Ceiling opening)
68cm
(Suspension bolt)
84cm (Body)
95cm (Ceiling opening)
Fig. 4.3
MODEL Length of A mm Length of H mm
18 235 205
24 275 245
30 275 245
48 317 287
55 317 287
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
≤30000
30000-48000
>48000
Model
(B tu/h)

Page 10 
5. Mount the indoor unit. You will need two people to
lift and secure it. Insert suspension bolts into the unit’s
NOTE: The bottom of the unit should be 10 - 18mm
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
Water level
M6 x 12 Bolts
higher than the ceiling board. Generally, L
10 - 18mm
hanging holes.
malfunction and cause water to leak.
Fig. 4.6
Fig. 4.4
(See Fig. 4.4).
Fig. 4.5
template
Cardboard installation
(indicated in Fig. 4.5) should be half the length of the
Fig. 4.7

Page 11 
Outdoor Unit Installation
Outdoor Unit Installation Instructions
Step 1: Select installation location.
The outdoor unit should be installed in the location that
meets the following requirements:
Place the outdoor unit as close to the indoor unit as
possible.
Ensure that there is enough room for installation and
maintenance.
The air inlet and outlet must not be obstructed or
exposed to strong wind.
Ensure the location of the unit will not be subject to
snowdrifts, accumulation of leaves or other seasonal
debris. If possible, provide an awning for the unit.
Ensure the awning does not obstruct airflow.
The installation area must be dry and well ventilated.
There must be enough room to install the connecting
pipes and cables and to access them for maintenance.
The pipe length between the outdoor and indoor unit
may not exceed the maximum allowable pipe length.
If the location is exposed to strong winds (for
example: near a seaside), the unit must be placed
against the wall to shelter it from the wind.
Strong wind
Strong wind
Strong wind
Step 2: Install outdoor unit.
Fix the outdoor unit with anchor bolts (M10)
Fix with bolts
CAUTION
• Be sure to remove any obstacles that
may block air circulation.
• Make sure you refer to Length
Specifications to ensure there is
enough room for installation and
maintenance.
Outdoor Unit
Installation
>60cm
Fig. 5.0
Fig. 5.1
See Fig. 5.0/5.1
5
Fig. 5.2

Page 12 
Outdoor Unit
Installation
A
B
D
W
H
W
H
W x H x D
Mounting Dimensions
Distance A Distance B
Unit (unit: mm)
845x363x702 540 350
946x410x810 673 403
800x333x554 514 340
952x415x1333 634 404
Outdoor Unit Dimensions
Table 5.1: Length Specifications of Split Type Outdoor
More than 60cm
Never hold the inlet of the outdoor unit to prevent it from deforming.
Since the units center of gravity is not at its physical center take care when lifting it with slings.
Make concrete foundation according to the specifications of the outdoor units.
Fasten the feet of this unit with bolts firmly to prevent it from collapsing in case of strong winds.
Do not touch the fan with hands or other objects.
Do not lean it more than 45˚and do not lay it sidelong.
Fig. 5.3
Fig. 5.4
Fig. 5.5
Fig. 5.6
NOTE
18
24
30/36
48/55

Page 13 
NOTE: The minimum distance between the outdoor
unit and walls described in the installation guide does
not apply to airtight rooms. Be sure to keep the unit
unobstructed in at least two of the three directions (M,
Drain Joint Installation
Before bolting the outdoor unit in place, you must install
the drain joint at the bottom of the unit. (See Fig. 5.11)
1. Fit the rubber seal on the end of the drain joint that
will connect to the outdoor unit.
2. Insert the drain joint into the hole in the base pan of
the unit.
3. Rotate the drain joint 90° until it clicks in place
facing the front of the unit.
4. Connect a drain hose extension (not included) to
the drain joint to redirect water from the unit during
heating mode.
NOTE: Make sure the water drains to a safe location
where it will not cause water damage or a slipping
hazard.
Seal
Drain joint
(A) (B)
Base pan hole of
outdoor unit
Seal
Notes On Drilling Hole In Wall
You must drill a hole in the wall for the refrigerant piping,
and the signal cable that will connect the indoor and
outdoor units.
1. Determine the location of the wall hole based on the
location of the outdoor unit.
2.
NOTE: When drilling the wall hole, make sure
to avoid wires, plumbing, and other sensitive
components.
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.
Outdoor Unit
Installation
Using a 65-mm core drill, drill a hole in the wall.
N, P) (See Fig. 5.6)
Fig. 5.6
evoba
mc06
60cm
on right
30cm
on left
200cm
in front
30cm
L
H
A
>60cm
>300cm
>150cm
>25cm
>25cm
The relations between H, A and L are as follows.
L A
L ≤H
L ≤1/2H 25 cm / 9.8” or
more
1/2H < L ≤H 30 cm / 11.8” or
more
L > H Can not be installed

Page 14 
NOTE ON DRAINPIPE INSTALLATION
• When using an extended drainpipe, tighten the
indoor connection with an additional protection
tube to prevent it from pulling loose.
• The drainpipe should slope downward at a gradient
of at least 1/100 to prevent water from flowing
back into the air conditioner.
• To prevent the pipe from sagging, space hanging
• If the outlet of the drainpipe is higher than the
body’s pump joint, provide a lift pipe for the
exhaust outlet of the indoor unit. The lift pipe must
ceiling board and the distance between the unit
Incorrect installation could cause water to flow
back into the unit and flood.
• To prevent air bubbles, keep the drain hose level or
Fig. 6.3
NOTE: When connecting multiple drainpipes, install the
pipes as shown in Fig 6.4.
0-53cm
10cm
Fig. 6.4
The drainpipe is used to drain water from the unit.
Improper installation may cause unit and property damage.
CAUTION
• Insulate all piping to prevent condensation, which
could lead to water damage.
• If the drainpipe is bent or installed incorrectly, water
may leak and cause a malfunction of the water-
level switch.
• In HEAT mode, the outdoor unit will discharge
water. Ensure that the drain hose is placed in
an appropriate area to avoid water damage and
slippage due to frozen drain water.
• DO NOT pull the drainpipe forcefully as this could
cause it to disconnect.
This installation requires a polyethylene tube (outside
2. Attach the mouth of the drain hose to the unit’s outlet
pipe. Sheath the mouth of the hose and clip it firmly
with a pipe clasp. (Fig 6.1)
Drainpipe
connecting port
Drain hose
Fig. 6.1
Drainpipe Installation
Drainpipe
Installation
Downward slope
1/100
1-1.5m
75cm
Ceiling
1 - 1.5m
0 - 75mm
53cm
22cm
Metal clamp
Fig. 6.2
be installed no higher than 75cm from the
and the lift pipe must be less than 30cm.
slightly tiled up (<75mm).
wires every 1-1.5m.
30cm
diameter = 3.7-3.9cm, inside diameter = 3.2cm),
6
NOTE ON DRAIN PIPE

Page 15 
Wall
Fig. 6.5
NOTE: When drilling the wall hole, make sure to avoid
wires, plumbing, and other sensitive components.
the water drains to a safe location where it will not
cause water damage or a slipping hazard.
Drainpipe
Installation
NOTE: The drainpipe outlet should be at least 5cm
above the ground. If it touches the ground, the unit may
become blocked and malfunction. If you discharge the
water directly into a sewer, make sure that the drain has
a U or S pipe to catch odors that might otherwise come
back into the house.
so that the outdoor end of the hole is lower than the
indoor end by about 12mm . This will ensure proper
water drainage (See Fig. 6.5). 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.
12mm
B ra n c h p ip e
W a te r flo w
W a te r flo w
K e e p a c e r ta in d e g re e
B ra n c h p ip e
G a s
G a s
M a in p ip e M a in p ip e
D ra in a g e p ip e
W a t e r f lo w
D ra in a g e p ip e D ra in a g e p ip e
D r a i n t e e
D r a i n t e e
W a te r flo w W a te r flo w W a te r flo w W a te r flo w W a te r flo w
W a te r flo w
W a te r flo w
W a te r flo w
D r a i n te e
sure that the hole is drilled at a slight downward angle,
4. Pass the drain hose through the wall hole. Make sure
Outdoor Indoor
3. Using a 65-mm core drill, drill a hole in the wall. Make

Page 16 
Safety Precautions
WARNING
• All field piping must be completed by a licensed
technician and must comply with the local and
national regulations.
• When the air conditioner is installed in a small
room, measures must be taken to prevent the
refrigerant concentration in the room from
exceeding the safety limit in the event of
refrigerant leakage. If the refrigerant leaks and
its concentration exceeds its proper limit, hazards
due to lack of oxygen may result.
• When installing the refrigeration system, ensure
• Ventilate the area immediately if there is
Notes On Pipe Length and Elevation
Table 7.1: The Maximum Length And Drop Height
Capacity Length of
piping Maximum drop
height
Refrigerant Piping with Twin Indoor Units
LL1
L2
H2
The line branch pipe
Indoor unit
Outdoor unit
H1
Indoor unit
Fig. 7.1
Refrigerant Piping
Connection
48 30
24 50 25
Code
Based on Models. (Unit: meters)
18 30
30 50 25
refrigerant leakage during the installation. Leaked
refrigerant gas is both toxic and flammable.
Ensure there is no refrigerant leakage after
completing the installation work.
that air, dust, moisture or foreign substances do
not enter the refrigerant circuit. Contamination
in the system may cause poor operating capacity,
high pressure in the refrigeration cycle, explosion
or injury.
7
Ensure that the length of the refrigerant pipe, the number
of bends, and the drop height between the indoor and
outdoor units meets the requirements shown in Table 7.1:
When installing multiple indoor units to a single outdoor unit, ensure that the length of the refrigerant pipe and the
height difference between the indoor and outdoor units meets the following requirements:
and outdoor unit
must be less than
or equal to 20m
The drop height difference
between the indoor unit
50cm
The drop height difference
between two indoor units
must be less than or
equal to
Refrigerant Piping Connection
55
65
65
30
20

Page 17 
Table 7.2
Refrigerant Piping Connection Instructions
CAUTION
• The branching pipe must be installed horizontally.
An angle of more than 10° may cause malfunction.
• DO NOT install the connecting pipe until both
indoor and outdoor units have been installed.
Step1: Cut pipes
When preparing refrigerant pipes, take extra care
to cut and flare them properly. This will ensure
efficient operation and minimize the need for future
maintenance.
1. Measure the distance between the indoor and
outdoor units.
2. Using a pipe cutter, cut the pipe a little longer than
the measured distance.
CAUTION
DO NOT deform pipe while cutting. Be extra careful not
to damage, dent, or deform the pipe while cutting. This
will drastically reduce the heating efficiency of the unit.
1. Make sure that the pipe is cut at a perfect 90°
angle. Refer to Fig. 7.2 for examples of bad cuts
Oblique Rough Warped
90°
Fig. 7.2
1. Hold the pipe at a downward angle to prevent
burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove all burrs
from the cut section of the pipe.
Pipe
Reamer
1. After removing burrs from cut pipe, seal the ends
with PVC tape to prevent foreign materials from
entering the pipe.
2. Sheath the pipe with insulating material.
3. Place flare nuts on both ends of pipe. Make sure
they are facing in the right direction, because you
can’t put them on or change their direction after
flaring. See Fig. 7.4
Flare nut
Copper pipe
Fig. 7.4
Flare form
Pipe
Fig. 7.5
Refrigerant Piping
Connection
Fig. 7.3
Step 3: Flare pipe ends
Proper flaring is essential to achieve an
piping connection. They must be completely
removed.
Point down
Burrs can affect thegas-tight seal of refrigerant
• Insulate both the gas and liquid piping to prevent
water leakage.
Step 2: Remove burrs.
Permitted length
Piping
length
24K+24K
30K+30K
(farthest distance
from the line pipe
branch)
(farthest distance
from the line pipe
branch)
Drop
height
Drop height between
indoor and outdoor
unit
Drop height between
two indoor units
(L1, L2)
10mL1-L2
20mH1
0.5mH2
65m
Total piping length 18K+18K 50mL+Max
15mL1, L2
gas-tight seal

Page 18 
6. Place flaring tool onto the form.
7. Turn the handle of the flaring tool clockwise until
the pipe is fully flared. Flare the pipe in accordance
with the dimensions shown in table 7-3.
8. Remove the flaring tool and flare form, then inspect
the end of the pipe for cracks and even flaring.
Step 4: Connect pipes
1. When connecting the flare nuts, apply a thin coat
of refrigeration oil to the flared ends of the pipes.
2. Align the center of the two pipes that you will
connect.
Indoor unit tubing Flare nut Pipe
Fig. 7.7
3. Tighten the flare nut as tightly as possible by hand.
4. Using a spanner, grip the nut on the unit tubing.
5. While firmly gripping the nut, use a torque wrench
to tighten the flare nut according to the torque
values in table 7-.3.
NOTE: Use both a spanner and a torque wrench when
connecting or disconnecting pipes to/from the unit.
Fig. 7.8
CAUTION
Check to make sure there is no refrigerant leak after
completing the installation work. If there is a refrigerant
leak, ventilate the area immediately and evacuate
the system (refer to the Air Evacuation section of this
manual).
Refrigerant Piping
Connection
4. Remove PVC tape from ends of pipe when ready to
perform flaring work.
5. Clamp flare form on the end of the pipe. The end
of the pipe must extend beyond the flare form.
Table 7.3: PIPING EXTENSION BEYOND FLARE FORM
Connect the copper pipes to the indoor unit first, then
connect it to the outdoor unit. You should first connect the
low-pressure pipe, then the high-pressure pipe.
Pipe
gauge
Tightening
torque
Flare dimension (A) Flare shape
14.2-17.2 N.m
(144-176 kgf.cm)
32.7-39.9 N.m
(333-407 kgf.cm)
49.5-60.3 N.m
(504-616 kgf.cm)
61.8-75.4 N.m
(630-770 kgf.cm)
97.2-118.6 N.m
(990-1210 kgf.
cm)
109.5-133.7 N.m
(1117-1364 kgf.
cm)
(Unit: mm)
8.3 8.3
12.4 12.4
15.4 15.8
18.6 19
22.9 23.3
27 27.3
R0.4~0.8
45 °±
90
°
±4
A
Fig. 7.6
Min. Max .
1/4
3/4
3/8
1/2
5/8
7/8

Page 19 
Safety Precautions
WARNING
• Be sure to disconnect the power supply before
working on the unit.
• All electrical wiring must be done according to
local and national regulations.
• Electrical wiring must be done by a qualified
technician. Improper connections may cause
electrical malfunction, injury and fire.
• An independent circuit and single outlet must
• Connect the power cable to the terminals and
fasten it with a clamp. An insecure connection
may cause fire.
• Make sure that all wiring is done correctly and the
control board cover is properly installed. Failure
to do so can cause overheating at the connection
points, fire, and electrical shock.
• Ensure that main supply connection is made
through a switch that disconnects all poles, with
CAUTION
• Connect the outdoor wires before connecting the
indoor wires.
• Make sure you ground the unit. The grounding
• DO NOT connect the unit with the power source
until all wiring and piping is completed.
• Make sure that you do not cross your electrical
wiring with your signal wiring, as this can cause
distortion and interference.
Follow these instructions to prevent distortion when the
compressor starts:
• The unit must be connected to the main outlet.
Normally, the power supply must have a low output
impedance of 32 ohms.
• No other equipment should be connected to the
same power circuit.
• The unit’s power information can be found on the
rating sticker on the product.
Outdoor Unit Wiring
WARNING
Before performing any electrical or wiring work, turn off
the main power to the system.
1. Prepare the cable for connection
Appliance (A) Nominal Cross-Sectional
Area (mm²)
6 0.75
6 - 10 1
10 - 16 1.5
16 - 25 2.5
25- 32 4
32 - 45 6
Wiring
contact gap of a least 3mm.
8
be used for this unit. If the
electrical circuit capacity is not enough or there
is a defect in the electrical work, it can lead to
shock, fire, unit and property damage.
Wiring
TAKE NOTE OF FUSE SPECIFICATIONS
The air conditioner’s circuit board(PCB) is
designed with a fuse to provide overcurrent
protection. The specications of the fuse are
printed on the circuit board, such as:
Indoor unit: T3.15A/250VAC, T5A/250VAC.
(applicable for unit adopts R32
or R290 r
efrigerant only )
Outdoor unit: T20A/250VAC(for <24000Btu/h
unit), T30A/250VAC(for >24000Btu/h unit)
NOTE: The fuse is made of ceramic.
wire should be away from gas pipes, water pipes,
lightning rods, telephone or other grounding
wires. Improper grounding may cause electrical
shock.
Cross-section area of power

Page 20 
b. Using wire strippers, strip the rubber jacket from
both ends of signal cable to reveal about 15cm
c. Strip the insulation from the ends of the wires.
d. Using a wire crimper, crimp u-lugs on the ends of
the wires.
NOTE: While connecting the wires, please strictly follow
the wiring diagram (found inside the electrical box cover).
2. Remove the electric cover of the outdoor unit.
If there is no cover on the outdoor unit, disassemble
the bolts from the maintenance board and remove the
Cover
Screw
Fig. 8.1
3. Connect the u-lugs to the terminals
4. Clamp down the cable with designated cable clamp.
5. Insulate unused wires with electrical tape. Keep them
away from any electrical or metal parts.
6. Reinstall the cover of the electric control box.
Indoor Unit Wiring
1. Prepare the cable for connection
a. Using wire strippers, strip the rubber jacket from
both ends of signal cable to reveal about 15cm
b. Strip the insulation from the ends of the wires.
c. Using wire crimper, crimp the u-lugs to the ends of
the wires.
2. Open the front panel of the indoor unit. Using a
screwdriver, remove the cover of the electric control box
on your indoor unit.
3. Thread the power cable and the signal cable through
the wire outlet.
Control box
4. Connect the u-lugs to the terminals.
wire to its corresponding terminal. Refer to the Serial
Number and Wiring Diagram located on the cover of
the electric control box.
Control box
CAUTION
• While connecting the wires, please strictly follow
the wiring diagram.
• The refrigerant circuit can become very hot. Keep
the interconnection cable away from the copper
tube.
5. Clamp down cable with the designated cable clamp to
secure it in place. The cable should not be loose, and
6. Reinstall the electric box cover and the front panel of
the indoor unit.
Wiring
of the wires inside.
of the wires inside.
should not pull on the u-lugs.
Match the wire colours/labels with the labels on
the terminal block, and firmly screw the u-lug of
each
Match the wire colours/labels with the labels on the
terminal block, and firmly screw the u-lug of each wire
to its corresponding terminal.
Wiring
1 23
Pass the belt through
the hole of the Magnetic
ring to fix it on the cable
Magnetic ring
Wiring diagram Connective wiring diagram
protection board. (See Fig. 8.1)
Fig 8.2
Fig 8.3
Fig 8.4