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

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

√

Page 2 

Outdoor Unit

Installation

Page 3 

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

300 cm / 118” or more

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.

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

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

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.

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.

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 

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