Midea AOU-71HRDC1 User manual

Condensing units
Dynamic inverter PRO
AOU-71HRDC1
AOU-105HRDC3
AOU-140HRDC3
AOU-180HRDC3

Page 1 
Outdoor Unit Installation
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 area must be free of combustible gases
and chemicals.
The pipe length between the outdoor and
indoor unit may not exceed the maximum
allowable pipe length.
If possible, DO NOT install the unit where it
is exposed to direct sunlight.
If possible, make sure the unit is located far
away from your neighbors’ property so that
the noise from the unit will not disturb them.
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. If necessary, use an awning.
(See Fig. 4.1 & 4.2)
Install the indoor and outdoor units, cables
and wires at least 1 meter from televisions or
radios to prevent static or image distortion.
Depending on the radio waves, a 1 meter
distance may not be enough to eliminate all
interference.
Strong wind
Strong wind
Strong wind
Fig. 4.1
Fig. 4.2
Step 2: Install outdoor unit.
Fix the outdoor unit with anchor bolts (M10)
>60cm / 23.6”
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.
Fig. 4.3
√
√
√
√
√
√
√
√
√
√
√
√
1

Page 2 

Outdoor Unit Installation
Page 3 
M
N
P
30 cm / 11.8” from back wall
60 cm / 23.6” on right
60 cm / 23.6” above
30 cm / 11.8” on left
200 cm / 78” in front
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, N, P)
(See Fig. 4.10)
Fig. 4.10
Fig. 4.11
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
Fig. 4.12
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. Using a 65-mm (2.5”) core drill, drill a hole
in the wall.
NOTE: When drilling the wall hole, make
sure to avoid wires, plumbing, and other
sensitive components.
3. Place the protective wall cu in the hole.
This protects the edges of the hole and will
help seal it when you nish the installation
process.
Fig. 5.11
L
H
300 cm / 118” or more
A
60 cm / 23.6”
or more
150 cm / 59”
or more
25 cm / 9.8”
or more
25 cm / 9.8”
or more
Rows of series installation
L ≤H L ≤1/2H
L A
25 cm / 9.8” or more
1/2H < L ≤H 30 cm / 11.8” or more
L >H Can not be installed
Table 4.3 The relations between H, A and L
are as follows.
Drain Joint Installation
If the drain joint comes with a rubber seal
(see Fig. 4.12 - A ), do the following:
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.
If the drain joint doesn’t come with a rubber
seal (see Fig. 4.12 - B ), do the following:
Insert the drain joint into the hole in the base
pan of the unit. The drain joint will click in
place.
Connect a drain hose extension (not included)
to the drain joint to redirect water from the
unit during heating mode.

2
Page 4 

Refrigerant Piping
Connection
Page 5 
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.
• Insulate both the gas and liquid piping to
prevent water leakage.
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.
For R32/R290
refrigerantmodels, the pipe connection
points must be placed outside of room.
The connection pipes can not be reused.
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. 6.3 for examples of
bad cuts.
Oblique Rough Warped
90°
Fig. 6.3
Fig. 6.2
CAUTION
If the outdoor unit is installed higher than
the indoor unit:
-It is recommended that vertical suction
risers not be upsized. Proper oil return to
the compressor should be maintained with
suction gas velocity. If velocities drop
below7.62m/s (1500fpm (feet per minute)),
oil return will be decreased. An oil trap
should be installed every 6m(20ft) of
vertical suction line riser. (See Fig. 6.2)
The outdoor unit is installed higher than the indoor unit

Refrigerant Piping
Connection
Page 6 
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 6.3.
Table 6.3: PIPING EXTENSION BEYOND FLARE
FORM
8. Remove the flaring tool and flare form,
then inspect the end of the pipe for cracks
and even flaring.
Step 4: Connect pipes
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.
1. When connecting the flare nuts, apply a
thin coat of refrigeration oil to the flared
ends of the pipes.
2. Alignthe center of the two pipes that you
will connect.
Indoor unit tubing Flare nut Pipe
Fig. 6.8
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 6.3.
NOTE: Use both a spanner and a torque
wrench when connecting or disconnecting
pipes to/from the unit.
Fig. 6.9
Step 2: Remove burrs.
Burrs can aect the air-tight seal of refrigerant
piping connection. They must be completely
removed.
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
Point down
Fig. 6.4
Step 3: Flare pipe ends
Proper flaring is essential to achieve an airtight
seal.
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. 6.5
Flare nut
Copper pipe
Fig. 6.5
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.
Flare form
Pipe
Fig. 6.6
Pipe
gauge Tightening
torque Flare dimension (A) (Unit: mm/Inch) Flare shape
Min. Max.
Ø 6.4
R0.4~0.8
45°±2
90 °
±4
A
Fig. 6.7
Ø 9.5
Ø 12.7
Ø 15.9
18-20N.m
(183-204kgf.cm) 8.4/0.33 8.7/0.34
25-26 N.m
(255-265 kgf.cm) 13.2/0.52 13.5/0.53
35-36 N.m
(357-367 kgf.cm) 16.2/0.64 16.5/0.65
45-47 N.m
(459-480 kgf.cm) 19.2/0.76 19.7/0.78

Refrigerant Piping Connection
Page 7 
Installation Of The Throttle. (Some Models)
Indoor
Indoor
Indoor
Outdoor
Outdoor
Outdoor
1 Throttle
2 Liquid pipe
3 Gas pipe
Precautions
- For ensuring throttled eciency, please
mount the throttle as horizontally as possible.
- Wrap the supplied anti-shock rubber at
external of the throttle for denoise.
1 Anti-shock rubber
2 Throttle
CAUTION
• Ensure to wrap insulation around the
piping. Direct contact with the bare piping
may result in burns or frostbite.
• Make sure the pipe is properly connected.
Over tightening may damage the bell
mouth and under tightening may lead to
leakage.
NOTE ON MINIMUM BEND RADIUS
Carefully bend the tubing in the middle
according to the diagram below. DO NOT
bend the tubing more than 90° or more than
3 times.
Bend the pipewith thumb
min-radius 10cm (3.9”)
Fig. 6.10
6. After connecting the copper pipes to the
indoor unit, wrap the power cable, signal
cable and the piping together with binding
tape.
NOTE: 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.
7. Thread this pipeline through the wall and
connect it to the outdoor unit.
8. Insulate all the piping, including the valves
of the outdoor unit.
9. Open the stop valves of the outdoor unit
to start the flow of the refrigerant between
the indoor and outdoor unit.
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).

Wiring
Page 8 
Wiring
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
qualied technician. Improper connections
may cause electrical malfunction, injury
and fire.
•An independent circuit and single outlet
must be used for this unit. DO NOT plug
another appliance or charger into the same
outlet. 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.
•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 contact gap of a least 3mm
(0.118”).
• DO NOT modify the length of the power
cord or use an extension cord.
CAUTION
•Connect the outdoor wires before
connecting the indoor wires.
•Make sure you ground the unit. The
grounding wire should be away from gas
pipes, water pipes, lightning rods,
telephone or other grounding wires.
Improper grounding may cause electrical
shock.
• 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:
•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.
•The unit must be connected to the main
outlet. Normally, the power supply must
have a low output impedance of 32 ohms.
NOTE: The fuse is made of ceramic.
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 refrigerant)
Outdoor unit: T20A/250VAC.
,
3

Test Run
Before Test Run
A test run must be performed after the entire
system has been completely installed. Confirm
the following points before performing the test:
a) The indoor and outdoor units are properly
installed.
b) Piping and wiring are properly connected.
c) Ensure that there are no obstacles near the
inlet and outlet of the unit that might cause
poor performance or product malfunction.
d) The refrigeration system does not leak.
e) The drainage system is unimpeded and
draining to a safe location.
f) The heating insulation is properly installed.
The grounding wires are properly connected.
g)
h) The length of the piping and the added
refrigerant stow capacity have been
recorded.
i) The power voltage is the correct voltage
for the air conditioner.
CAUTION
Failure to perform the test run may result in
unit damage, property damage or personal
injury.
Test Run Instructions
1. Open both the liquid and gas stop valves.
2. Turn on the main power switch and allow the
unit to warm up.
3. Set the air conditioner to COOL mode.
4. For the Indoor Unit
a. Ensure the remote control and its buttons
work properly.
b. Ensure the louvers move properly and can
be changed using the remote control.
c. Double check to see if the room
temperature is being registered correctly.
d. Ensure the indicators on the remote
control and the display panel on the indoor
unit work properly.
e. Ensure the manual buttons on the indoor
unit works properly.
f. Check to see that the drainage system is
unimpeded and draining smoothly.
g. Ensure there is no vibration or abnormal
noise during operation.
5. For the Outdoor Unit
a. Check to see if the refrigeration system is
leaking.
b. Make sure there is no vibration or
abnormal noise during operation.
c. Ensure the wind, noise, and water
generated by the unit do not disturb your
neighbors or pose a safety hazard.
6. Drainage Test
a. Ensure the drainpipe flows smoothly. New
buildings should perform this test before
finishing the ceiling.
b. Remove the test cover. Add 2,000ml of
water to the tank through the attached
tube.
c. Turn on the main power switch and run
the air conditioner in COOL mode.
d. Listen to the sound of the drain pump to
see if it makes any unusual noises.
e. Check to see that the water is discharged.
It may take up to one minute before the
unit begins to drain depending on the
drainpipe.
f. Make sure that there are no leaks in any of
the piping.
g. Stop the air conditioner. Turn o the main
power switch and reinstall the test cover.
NOTE: If the unit malfunctions or does not
operate according to your expectations,
please refer to the Troubleshooting section
of the Owner’s Manual before calling
customer service.
Test Run
Page 9 
4