Midea MEU-18MPH2, MEU-24MPH2, MEU-36MPT2, MEU-48MPT2, MEHSU-12CHD2 Installation Manual

MIDDLE STATIC PRESSURE DUCT TYPE AIR CONDITIONER

Installation Manual

Middle Static Pressure Duct Type

IMPORTANT NOTE:

Read this manual carefully before
installing or operating your new air
conditioning unit. Make sure to save
this manual for future reference.

MEU-18MPH2
MEU-24MPH2
MEU-36MPT2
MEU-48MPT2

Accessories

.................................................... 04

a. Indoor Unit Parts

........................................ 07

b. Indoor Unit Installation Instructions

.......08

Safety Precautions

.....................................05

Outdoor Unit Installation

......................... 12

a. Outdoor Unit Installation Instructions

......12

b. Outdoor Unit Types and Specifications ....13

c. Notes on Drilling Hole in Wall

....................14

Drainpipe Installation

............................... 15

Table of Contents

Installation Manual

Indoor Unit Installation

...........................07

Installation Overview

...............................06

1

2

5

3

4

6

 Page 3 

Refrigerant Piping Connection

.......................17

A. Notes on Pipe Length and Elevation ..............17

B. Refrigerant Piping Connection Instructions

...18

Wiring

................................................. 20

a. Outdoor Unit Wiring .................. 20

b. Indoor Unit Wiring

..................... 21

c. Power Specifications

................... 23

Air Evacuation

..................................................25

a. Evacuation Instructions

................................ 25

b. Note on Adding Refrigerant

....................... 26

Test Run

............................................. 27

MC MC

7

8

9

10

LN

 Page 4 

Accessories

1

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 equipment failure.

Connecting wire for display (2m)

Cord protection rubber ring

QUANTITY

SHAPE

NAME

Soundproof / insulation sheath

2

1

1

1

Tubing & Fittings

Others

Installation manual

Transfer connector(Φ12.7-Φ15.9)/
( )(Packed with the indoor unit )
NOTE: Pipe size may differ from appliance to
appliance. To meet different pipe size requirements,
sometimes the pipe connections need a transfer
connector installed on the outdoor unit .

Transfer connector(Φ6.35-Φ9.52)/
( )(Packed with the indoor unit)
NOTE: Pipe size may differ from appliance to
appliance. To meet different pipe size requirements,
sometimes the pipe connections need a transfer
connector installed on the outdoor unit .

Transfer connector(Φ9.52-Φ12.7)/
( ) (Packed with the indoor unit,
used for multi-type models only )
NOTE: Pipe size may differ from appliance to
appliance. To meet different pipe size requirements,
sometimes the pipe connections need a transfer
connector installed on the outdoor unit .

1

Owner‘s manual

Drain joint (some models)

Seal ring (some models)

Drainpipe Fittings
(for cooling & heating)

Seal sponge (some models)

EMC Magnetic Ring
(some models)

Magnetic ring
(wrap the electric wires S1 & S2 ( P & Q & E )
around the magnetic ring twice)

Magnetic ring
(Hitch on the connective cable between the indoor
unit and outdoor unit after installation.)

1

1

Orifice (some models)

1

Φ0.5in-Φ0.63in

Φ0.25in-Φ0.375in

Φ0.375in-Φ0.5in

1
(on some models)

1
(on some models)

1
(on some models)

1(on some models)

1(on some models)

1

Optional accessories

There are two types of remote controls: wired and wireless.
Select a remote controller based on customer preferences and requirements and install in an
appropriate place.
Refer to catalogues and technical literature for guidance on selecting a suitable remote controller.

•

S1&S2(P&Q&E)

 Page 5 

Safety Precautions

2

Read Safety Precautions Before Installation

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

• Carefully read the Safety Precautions before installation.

• In certain functional environments, such as kitchens, server rooms, etc., the use of specially

designed air-conditioning units is highly recommended.

• 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.

• Before you install the unit, consider strong winds, typhoons and earthquakes that might affect
your unit and 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 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.

Failure to observe a caution may result in injury or equipment damage.

WARNING

CAUTION

Failure to observe a warning may result in death. The product must be installed by
installers or contractors who are licenced HVAC professionals and in compliance

with all local and state and provincial laws.

 Page 6 

Installation Overview

3

Unit Installation

Overview

LN

1

2

3

4

5

MC MC

6

7

Install the indoor unit

(Page 7)

INSTALLATION ORDER

Install the outdoor unit

(Page 13)

Install the drainpipe

(Page 15)

Evacuate the refrigeration system

(Page 25)

Connect the wires

(Page 20)

Connect the refrigerant pipes

(Page 17)

Perform a test run

(Page 27)

 Page 7 

Indoor Unit Installation

4

Indoor Unit

Installation

Indoor Unit Parts

Fig. 4.1

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 even
death

• DO NOT install the indoor unit in a bathroom

or laundry room as excessive moisture can
short the unit and corrode the wiring.

CAUTION

• Install the indoor and outdoor units, cables
and wires at least 1m (3.2’) from televisions
or radios to prevent static or image
distortion. Depending on the appliances, a
1m (3.2’) distance may not be sufficient.

• If the indoor unit is installed on a metal
part of the building, it must be grounded.

Indoor Unit Installation Instructions

Step 1: Select installation location

The indoor unit should be installed in a location
that meets the following requirements:



Enough room for installation and maintenance.



Enough room for the connecting pipe and
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.

CAUTION

DO NOT install the unit in the following

locations:

Where oil drilling or fracking is taking place.

Coastal areas with high salt content in the air

Near geothermal activity and corrosive gas

Buildings that may experience power
fluctuations

Enclosed spaces

Areas with strong electromagnetic waves

Areas that store flammable materials or gas

Rooms with high humidity, such as
bathrooms or laundry rooms

Fig. 4.2

Air outlet

Air inlet

Air filter(on selected models)

Drain hose

Electric control cabinet

Refrigerant connecting pipe

checking orifice

60cmX60cm (23.6inX23.6in)

30cm (11.8inch) or more

20cm (7.9inch) or more

Maintenance Clearance

√

√

√

√

√

√

Safety Precautions

 Page 8 

Indoor Unit

Installation

Fig. 4.3

Step 2: Hang indoor unit.

1.

Please refer to the following diagrams to locate the four positioning screw bolt holes on the
ceiling. Be sure to mark the paces where you will drill ceiling hook holes.

Air outlet dimensions

Air inlet dimensions

Air filter

Descending ventilation opening and mounted hook

Air filter

Electric control box

Table.4-1 (unit: mm/inch)

MODEL

(Btu/h)

Outline dimension

ABC

18K 210/8.3 674/26.5880/34.6

24K 249/9.8 774/30.51100/43.3

30K~36K 249/9.8 774/30.51360/53.5

36K~60K 300/11.8 874/34.41200/47.2

air outlet opening size

DEF

136/5.4 706/27.8600/23.6

175/6.9 926/36.5700/27.6

175/6.9 1186/46.7700/27.6

227/8.9 1044/41.1800/31.5

air return opening size

190/7.5

228/8.9

228/8.9

280/11

Size of mounted lug

I

920/36.2782/30.8

1140/44.91001/39.4

1400/55.11261/49.6

1240/48.81101/43.3

J

G

H

508/20

598/23.5

598/23.5

697/27.4

 Page 9 

Indoor Unit

Installation

Cut off the roof beam.
Strengthen the point at which the cut

was made. Consolidate the roof beam.

Fig. 4.6

Fig. 4.7

Original concrete bricks

Use an embedding screw bolt, crock, and stick
harness.(See Fig.4.6)

Steel Roof beam structure

Install and use the supporting steel angle.
(See Fig.4.7)

Fig. 4.4

Wood

Place the wood mounting across the roof beam,
then install the hanging screw bolts.(See Fig.4.4)

Wood mounting

Roof beam

Hanging screw bolts

Ceiling

Fig. 4.5

New concrete bricks

Inlay or embed the screw bolts. (See Fig. 4.5)

(Blade shape insertion)

(Slide insertion)

Steel bar

Embedding screw bolt

(Pipe hanging and embedding screw bolt)

Hanging screw bolt

Hanging
bolts

Supporting
steel angle

Fig. 4.9

Screw nut

Washer

Hanging screw bolt

Overhang part

Shockproof cushion

NOTE:

Confirm the minimum drain tilt is 1/100
or more.

CAUTION

The unit body must be completely aligned with
the hole. Ensure that the unit and the hole are
the same size before moving on.

2. Install and fit pipes and wires after you have
finished installing the main body.When
choosing where to start, determine the
direction of the pipes to be drawn out.
Especially in cases where there is a ceiling
involved, align the refrigerant pipes, drain
pipes, and indoor and outdoor lines with their
connection points before mounting the unit.

3.

Install hanging screw bolts.

4.

After you select an installation location,align
the refrigerant pipes, drain pipes, as well as
indoor and outdoor wires with their
connection points before mounting the unit.

5.

Drill 4 holes 10cm (4”) deep at the ceiling
hook positions in the internal ceiling. Be sure
to hold the drill at a 90° angle to the ceiling.

6. Secure the bolt using the washers and nuts
provided.

7. Install the four suspension bolts.

8. Mount the indoor unit with at least two
people to lift and secure it. Insert suspension
bolts into the unit’s hanging holes. Fasten
them using the washers and nuts provided.
(See Fig. 4.8).

9. Mount the indoor unit onto the hanging
screw bolts with a block. Position the
indoor unit flat using a level indicator to
prevent leaks. (See Fig. 4.9).

Fig. 4.8

 Page 10 

Indoor Unit

Installation

Fig. 4.10

Step 3: Duct and accessories installation

NOTE: 1. Do not place the connecting duct

weight on the indoor unit.

2. When connecting the duct, use an
nonflammable canvas tie-in to prevent
vibrating.

3. Insulation foam must be wrapped outside the
duct to avoid condensate. An internal duct
underlayer can be added to reduce noise,
if the end-user requires.

1. Install the filter (optional) according to the size
of the air inlet.

5. Refer to the following static pressure guidelines
when installing the indoor unit.

Change the fan motor static pressure
according to external duct static pressure.

2. Install the canvas tie-in between the body and
the duct.

3. The air inlet and air outlet duct should be far
enough apart enough to a avoid air passage
short-circuit.

4. Connect the duct according to the following
diagram:

Canvas tie-in Canvas tie-in

Air outlet

Isolation booth

Isolation booth

checking orifice

Air inlet

Air dust filter

Table.4-2

MODEL

(Btu/h)

Static Pressure

(Pa / inAq)

0~100 (0-0.40)

18K

0~160 (0-0.64)

24K

30K~36K

42K~60K

0~160 (0-0.64)

0~160 (0-0.64)

 Page 11 

Indoor Unit

Installation

Step 4: Adjust the air inlet direction
(from rear side to under-side).

1. Take off the ventilation panel and flange.

2. Change the mounting positions of the
ventilation panel and air return flange.

Air return flange

Ventilation panel

3. When installing the filter mesh, fit it into the
flange as illustrated in the following figure.

NOTE: All the figures in this manual are for
demonstration purposes only. The air conditioner
you have purchased may be slightly different in
design, though similar in shape.

Step 5: Fresh air duct installation

Dimension :

Duct joint for fresh air

Ø125mm(4.92”)

Ø160mm(6.3”)

MODLE

18-60

Step 6: Motor and drain pump maintenance

Motor maintain:

Take off the ventilated panel.
Take off the blower housing.
Take off the motor.

1.

2.

3.

(the rear ventilated panel is used as an example)

Mofor

Blower housing

Ventilated panel

Pump maintainance:

Remove four screws from the drain pump.
Unplug the pump power supply and water
level switch cable.
Detach the pump.

1.

2.

3.

Pump

Fig. 4.11

Fig. 4.12

Fig. 4.13

Fig. 4.14

Fig. 4.15

Fig. 4.16

Air return flange

Ventilation panel

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. 5.1 & 5.2)



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. 5.1 Fig. 5.2

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. 5.3

 Page 12 

Outdoor Unit

Installation

5

√

√

√

√

√

√

√

√

√

√

√

√

 Page 13 

Outdoor Unit

Installation

>120cm / 47”

Air Outlet

(Wall or obstacle)

H

D

W

>30cm / 11.8”

Air inlet

Air inlet

Air inlet

Air inlet

(Wall or obstacle)

>30cm / 11.8”

>30cm / 11.8”

>30cm / 11.8”

Table 5.1: Length Specifications of Split

Type Outdoor Unit (unit: mm/inch)

Table 5.2: Length Specifications of Vertical

Discharge Outdoor Unit (unit: mm/inch)

MODEL

DIMENSIONS

WH D

18 633/25 554/21.8554/21.8

24 633/25 554/21.8554/21.8

36 759/29.8 554/21.8554/21.8

36 633/25 600/23.6600/23.6

48 759/29.8 710/28710/28

60 843/33 710/28710/28

Split Type Outdoor Unit

(Refer to Fig 5.4, 5.5, 5.6, 5.10 and Table 5.1)

Vertical Discharge Type Outdoor Unit

(Refer to Fig 5.7, 5.8, 5.9 and Table 5.2)

Fig. 5.7

Fig. 5.8

Fig. 5.9

Fig. 5.6

Fig. 5.5

A

B

D

W

H

W

H

Fig. 5.4

Outdoor Unit Dimensions

W x H x D

Mounting Dimensions

Distance A Distance B

760x590x285 (29.9x23.2x11.2) 530 (20.85) 290 (11.4)

810x558x310 (31.9x22x12.2) 549 (21.6) 325 (12.8)

845x700x320 (33.27x27.5x12.6) 560 (22) 335 (13.2)

900x860x315 (35.4x33.85x12.4) 590 (23.2) 333 (13.1)

945x810x395 (37.2x31.9x15.55) 640 (25.2) 405 (15.95)

990x965x345 (38.98x38x13.58) 624 (24.58) 366 (14.4)

946x810x420 (37.24x31.9x16.53) 673 (26.5)

403 (15.87)

946x810x410 (37.24x31.9x16.14) 673 (26.5)

403 (15.87)

952x1333x410 (37.5x52.5x16.14) 634 (24.96)

404 (15.9)

952x1333x415 (37.5x52.5x16.34) 634 (24.96)

404 (15.9)

845x702x363 (33.27x27.6x14.3)

540 (21.26)

350 (13.8)

938x1369x392 (36.93x53.9x15.43) 634 (24.96) 404 (15.9)

900x1170x350 (35.4x46x13.8) 590 (23.2) 378 (14.88)

800x554x333 (31.5x21.8x13.1) 514 (20.24) 340 (13.39)

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. 5.10)

M

N

P

30 cm / 11.8” from back wall

60 cm / 23.6” on right

60 cm

/

2

3.6” abo

ve

30 cm / 11.8” on left

200 cm / 78” in front

Fig. 5.10

Drain Joint Installation

Before bolting the outdoor unit in place, you
must install the drain joint at the bottom of the
unit. (See Fig. 5.12)

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

Fig. 5.12

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 cuff in the hole.
This protects the edges of the hole and will
help seal it when you finish the installation
process.

 Page 14 

Outdoor Unit

Installation

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

LA

25 cm / 9.8” or more

1/2H < L ≤ H

30 cm / 11.8” or more

L > H

Can not be installed

Table 5.3 The relations between H, A and L
are as follows.

Fig. 6.3

(39-59”)

(7.9”)

<20cm

(21.7”)

<55cm

Lean over 1/50

1-1.5m

Drainpipe installation for units with a pump

Ceiling

0 - 75mm

(3”)

NOTE ON DRAINPIPE INSTALLATION

•

When using an extended drainpipe, tighten
the indoor connection with an additional
protection tube. This prevents 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 wires every 1-1.5m (39-59”).

•

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 be installed no higher than
55cm (21.7”) from the ceiling board. the
distance between the unit and the lift pipe
must be less than 20cm (7.9”). Incorrect
installation could cause water to flow back
into the unit and flood.

The drainpipe is used to drain water away 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
water-level switch malfunction.

•

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.

•

DO NOT pull the drainpipe forcefully. This
could disconnect it.

NOTE ON PURCHASING PIPES

Installation requires a polyethylene tube
(exterior diameter = 3.7-3.9cm, interior diameter
= 3.2cm), which can be obtained at your local
hardware store or dealer.

Indoor Drainpipe Installation

Install the drainpipe as illustrated in Figure 6.2.

1.

2.

Drainpipe

connecting port

Drain hose

Pipe clasp

Insulation

Fig. 6.1

Drainpipe Installation

Fig. 6.2

 Page 15 

6

Drainpipe

Installation

Cover the drainpipe with heat insulation to
prevent condensation and leakage.

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.
(See Fig 6.1)

NOTE: When connecting multiple drainpipes,
install the pipes as illustrated in Fig 6.4.

(39-59”)

1-1.5m

Lean over 1/50

Ceiling

•

To prevent air bubbles, keep the drain hose
level or slightly tiled up (<75mm / 3”).

0-53cm
(20.8”)

≥10cm

(4”)

Fig. 6.4

Drainage test

Check that the drainpipe is unhindered.
This test should be performed on newly built
houses before the ceiling is paved.

Units with a pump.

Units without a pump.

1. Remove the test cover.
Fill the water pan with 2 liters of water.

2. Turn on the unit in COOLING mode. You will
hear the drain pump.Check whether the
water is discharged properly (a 1-minute lag
is possible, depending on the length of the
drain pipe), Check whether water leaks from
the joints.

3. Turn off the air conditioner and put the cap
back on.

3. Using a 65-mm (2.5”) 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 12mm (0.5”). 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
once you finish installation.

Wall

IndoorOutdoor

≈ 12mm / 0.5 inch

Fig. 6.5

NOTE: When drilling the hole, make sure to

avoid wires, plumbing, and other sensitive
components.

4.

Pass the drain hose through the wall hole.
Make sure the water drains to a safe location
where it will not cause water damage or a
slipping hazard.

NOTE: The drainpipe outlet should be at least
5cm (1.9”) 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.

 Page 16 

Drainpipe

Installation

Test cap

Fig.6.7

Fig.6.8

C

L

O

S

E

D

O

P

E

N

C

L

O

S

E

D

O

P

E

N

Stow tube

Fig.6.6

Stow tube

Fill the water pan with 2 liters of water.
Check that the drainpipe is unhindered.

Refrigerant Piping Connection

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 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.

• Ventilate the area immediately if there is
refrigerant leakage during the installation.

Leaked refrigerant gas is both toxic and
flammable. Ensure there is no refrigerant
leakage after completing the installation
work.

Notes On Pipe Length and Elevation

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:

Table 7.1: The Maximum Length And Drop

Height Based on Models. (Unit: m/ft.)

Type of model Capacity

(Btu/h)

Length of

piping

Maximum drop

height

North America,
Australia and the
eu frequency
conversion Split
Ty pe

<15K 25/82 10/32.8

15K - <24K 30/98.4 20/65.6

24K - <36K 50/164 25/82

36K - 60K 65/213 30/98.4

Other Split Type

12K 15/49 8/26

18K-24K 25/82 15/49

30K-36K 30/98.4 20/65.6

42K-60K 50/164 30/98.4

Refrigerant Piping with Twin Indoor Units

When installing multiple indoor units with a single outdoor unit, ensure that the length of the
refrigerant pipe and the drop height between the indoor and outdoor units meet the requirements
illustrated in the following diagram:

L

L1

L2

H2

The line branch pipe

Indoor unit

Outdoor unit

H1

Indoor unit

The drop height

between two

indoor units

must be less

than or equal to

50cm (19.6”)

The drop height
between indoor

unit
and outdoor unit
must be less than
or equal to 20m

(65.6’)

Fig. 7.1

 Page 17 

7

Refrigerant Piping

Connection

Table 7.2

Permitted length

Piping
length

Total piping length 18K+18K 30m/98’ L+Max

(L1, L2)

24K+24K

30K+30K

50m/164’

(farthest distance from
the line pipe branch)

15m/49’ L1, L2

(farthest distance from
the line pipe branch)

10m/32.8’ L1-L2

Drop
height

Drop height between
indoor and outdoor unit

20m/65.6’ H1

Drop height between
two indoor units

0.5m/1.6’ H2

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.

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

Step2: Remove burrs.

Burrs can affect 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 dow n

Fig. 7.3

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. 7.4

Flare nut

Copper pipe

Fig. 7.4

4.

Remove PVC tape from ends of pipe when

ready to perform flaring work.

 Page 18 

Refrigerant Piping

Connection

Size of joint pipes for indoor unit

Gas side

Capacity
of indoor
unit (A)

Size of main pipe(mm)

Liquid side

Φ12.7(0.5”)

Φ15.9(0.626”)

Φ15.9(0.626”)

Φ6.35(0.25”)

Φ9.5(0.375”)

Φ9.5(0.375”)

18K
24K

30K

Size of joint pipes for 410A indoor unit

Table 7.3

CE-FQZHN-01C

CE-FQZHN-01C

CE-FQZHN-01C

Available
branching pipe

Size of joint pipes for outdoor unit

Base on the following tables, select the diameters
of the outdoor unit connective pipes. In case of
the main accessory pipe large than the main pipe,
take the large one for the selection.

Model

Gas side Liquid side

Φ15.9(0.626”)

Φ15.9(0.626”)

Φ15.9(0.626”)

Φ9.5(0.375”)

Φ9.5(0.375”)

Φ9.5(0.375”)

the size of main pipe(mm)

36K
48K
60K

Size of joint pipes for 410A outdoor unit

Table 7.4

The 1st branching pipe

CE-FQZHN-01C
CE-FQZHN-01C

CE-FQZHN-01C

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. 7.5

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 7.5.

Table 7.5: PIPING EXTENSION BEYOND FLARE FORM

Pipe
gauge

Tightening

torque

Flare dimension (A)

(Unit: mm/Inch)

Flare shape

Min. Max.

Ø 6.4

14.2-17.2 N.m

(144-176 kgf.cm)

8.3/0.3 8.3/0.3

R0.4~0. 8

45

°

±

2

90

°

±

4

A

Fig. 7.6

Ø 9.5

32.7-39.9 N.m

(333-407 kgf.cm)

12.4/0.48 12.4/0.48

Ø 12.7

49.5-60.3 N.m

(504-616 kgf.cm)

15.4/0.6 15.8/0.6

Ø 15.9

61.8-75.4 N.m

(630-770 kgf.cm)

18.6/0.7 19/0.74

Ø 19.1

97.2-118.6 N.m

(990-1210 kgf.cm) 22.9/0.9 23.3/0.91

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 high­pressure pipe.

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 7.5.

NOTE: Use both a spanner and a torque wrench
when connecting or disconnecting pipes to/from

the unit.

Fig. 7.8

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 pipe with thumb

min-radius 10cm (3.9”)

Fig. 7.9

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).

 Page 19 

Refrigerant Piping

Connection

Ø 22

109.5-133.7 N.m

(1117-1364 kgf.cm) 27/1.06 27.3/1.07

TAKE NOTE OF FUSE SPECIFICATIONS

The air conditioner’s printed circuit board (PCB)
is designed with a fuse that provides overcurrent
protection. The specifications of the fuse are
printed on the circuit board, examples of such
are T5A/250VAC and T10A/250VAC.

Wiring

Safety Precautions

WARNING

•

Disconnect the power supply before
working on the unit.

• All wiring must be performed according to
local and national regulations.

• Wiring must be done by a qualified
technician. Improper connections may
cause electrical malfunction, injury, or 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 cannot
handle the load or there is a defect in the
wiring, it can lead to shock, fire, and 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 power supply connection
is made through a switch that disconnects
all poles, with contact gap of at 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 located away
from gas pipes, water pipes, lightning rods,
telephone wires or other grounding wires.
Improper grounding may cause electrical
shock.

•

DO NOT connect the unit to the power
source until all wiring and piping is
completed.

•

Make sure that you do not cross your
electrical wiring with your signal wiring.
This may cause distortion and interference.

To prevent distortion when the compressor starts
(you can find the unit’s power information on
the rating sticker):

• The unit must be connected to the main
outlet. Normally, the power supply must
have a impedance of 32 ohms.

• No other equipment should be connected
to the same power circuit.

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
a. You must first choose the right cable size.

Be sure to use H07RN-F cables.

Table 8.1: Minimum Cross-Sectional Area

of Power and Signal Cables in North
America

Rated Current of

Appliance (A)

AWG

 718

7 - 13 16
13 - 18 14
18 - 25 12
25 - 30 10

 Page 20 

8

Wiring

b. Using wire strippers, strip the rubber jacket

from both ends of the signal cable to reveal

approximately 15cm (5.9”) of wire.
c. Strip the insulation from the ends.
d. Using a wire crimper, crimp u-lugs on the

ends.

NOTE: When connecting the wires, 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, take
off the bolts from the maintenance board and
remove the protection board.
(See Fig. 8.1, 8.2)

Cover

Screw

Fig. 8.1

Protection Board

Fig. 8.2

3. Connect the u-lugs to the terminals
Match the wire colors/labels with the labels
on the terminal block, Firmly screw the u-lug
of each wire to its corresponding terminal.

4. Clamp down the cable with the 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 the signal cable to reveal
about 15cm (5.9”) of the wire.

b.

Strip the insulation from the ends of the
wires.

c. Using a wire crimper, crimp the u-lugs to

the ends of the wires.

 Page 21 

Wiring

2. Remove the cover of the electric control box
on your indoor unit.

3.

Connect the u-lugs to the terminals.

Match the wire colors/labels with the labels
on the terminal block, Firmly screw the u-lug
of each wire to its corresponding terminal.
Refer to the Serial Number and Wiring
Diagram located on the cover of the electric
control box.

Connective wiring diagram

Wiring diagram

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.

4.

Clamp down the cable with the cable clamp.
The cable must not be loose or pull on the
u-lugs.

5.

Reattach the electric box cover.

Fig. 8.3

Table 8.2: Other World Regions

Rated Current of

Appliance (A)

Area (mm²)

Nominal Cross-Sectional



6 0.75

6 - 10 1
10 - 16 1.5
16 - 25 2.5

25- 32 4

32 - 45 6

 Page 22 

Wiring

Using the wire controller to set external
static pressure (some models)

You can use the unit’s automatic airflow
adjustment function to set external static
pressure.

Automatic airflow adjustment is the volume
of blow-off air that has been automatically
adjusted to the quantity rated.

1. Make sure the test run is done with a dry
coil. If the coil is not dry, run the unit for 2
hours in FAN ONLY mode to dry the coil.

2. Check that both power supply wiring and
duct installation have been completed
Check that any closing dampers are open.
Check that the air filter is properly attached
to the air suction side passage of the unit.

3. If there is more than one air inlet and outlet,
adjust the dampers so that the airflow rate
of each air inlet and outlet conforms with
the designed airflow rate. Make sure the
unit is in FAN ONLY mode. Press and set
the airflow adjustment button on the
remote control to change the airflow rate
from H or L.

4. Set the parameters for automatic airflow
adjustment. When the air conditioning unit
is off, perform the follwoing steps:

- Press“COPY”.

- Press “+” or “-” to select the AF.

- Press “CONFIRM”. The air conditioning
unit will then start the fan for airflow
automatic adjustment.

ON will flash during when the
fan is on during automatic
airflow adjustment.

After 3 to 6 minutes, the air conditioning
unit stops operating once automatic airflow
adjustment has finished.

•

•

CAUTION

•

DO NOT adjust the dampers when
automatic airflow adjustment is active.

CAUTION

•

If there is no change after airflow
adjustment in the ventilation paths, be sure
to reset automatic airflow adjustment.

•

If there is no change to ventilation paths
after airflow adjustment,contact your dealer,
especially if this occurs after testing the
outdoor unit or if the unit has been moved
to a different location.

•

Do not use automatic airflow adjustment
with remote control,if you are using booster
fans, outdoor air processing unit, or a HRV
via duct.

•

If the ventilation paths have been changed,
reset airflow automatic adjustment as
described from step 3 onwards.

Power Specifications

 Page 23 

Wiring

NOTE: Electric auxiliary heating type circuit breaker/fuse need to add more than 10 A.

Indoor Power Supply Specifications

MODEL

(Btu/h)

18K 19K~24K 25K~36K 37K~48K 49K~60K

POWER

PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase

FREQUENCY

AND VOLT

208-240V 208-240V 208-240V 208-240V 208-240V

CIRCUIT BREAKER/

FUSE(A)

25/20 32/25 50/40 70/55 70/60

MODEL

(Btu/h)

36K 37K~60K 36K 37K~60K

POWER

PHASE 3 Phase 3 Phase 3 Phase 3 Phase

FREQUENCY

AND VOLT

380-420V 380-420V 208-240V 208-240V

CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 45/35

MODEL

(Btu/h)

18K 19K~24K 25K~36K 37K~48K 49K~60K

POWER

PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase

FREQUENCY

AND VOLT

208-240V 208-240V 208-240V 208-240V 208-240V

CIRCUIT BREAKER/

FUSE(A)

25/20 32/25 50/40 70/55 70/60

MODEL

(Btu/h)

36K 37K~60K 36K 37K~60K

POWER

PHASE 3 Phase 3 Phase 3 Phase 3 Phase

FREQUENCY

AND VOLT

380-420V 380-420V 208-240V 208-240V

CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 45/35

Outdoor Power Supply Specifications

Independent Power Supply Specifications

MODEL

(Btu/h)

18K 19K~24K 25K~36K 37K~48K 49K~60K

POWER

(indoor)

PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase

FREQUENCY

AND VOLT

208-240V 208-240V 208-240V208-240V 208-240V

CIRCUIT BREAKER/

FUSE(A)

15/10 15/10 15/10 15/10 15/10

POWER

(outdoor)

PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase

FREQUENCY

AND VOLT

208-240V 208-240V 208-240V

208-240V

208-240V

CIRCUIT BREAKER/

FUSE(A)

25/20 32/25 50/40 70/55 70/60

 Page 24 

Wiring

MODEL

(Btu/h)

18K 19K~24K 25K~36K 37K~48K 49K~60K

POWER

(indoor)

PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase

FREQUENCY

AND VOLT

220-240V 220-240V 220-240V220-240V 220-240V

CIRCUIT BREAKER/

FUSE(A)

15/10 15/10 15/10 15/10 15/10

POWER

(outdoor)

PHASE 1 Phase 1 Phase 1 Phase 1 Phase 1 Phase

FREQUENCY

AND VOLT

208-240V 208-240V 208-240V

208-240V

208-240V

CIRCUIT BREAKER/

FUSE(A)

25/20 25/20 40/30 50/40 50/40

MODEL

(Btu/h)

36K 37K~60K 36K 37K~60K

POWER
(indoor)

PHASE 1 Phase 1 Phase 1 Phase 1 Phase

FREQUENCY

AND VOLT

208-240V 208-240V 208-240V 208-240V

CIRCUIT BREAKER/FUSE(A) 15/10 15/10 15/10 15/10

POWER

(outdoor)

PHASE 3 Phase 3 Phase 3 Phase 3 Phase

FREQUENCY

AND VOLT

380-420V 380-420V 208-240V 208-240V

CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 45/35

MODEL

(Btu/h)

36K 37K~60K 36K 37K~60K

POWER

(indoor)

PHASE 1 Phase 1 Phase 1 Phase 1 Phase

FREQUENCY

AND VOLT

220-240V 220-240V 220-240V 220-240V

CIRCUIT BREAKER/FUSE(A) 15/10 15/10 15/10 15/10

POWER

(outdoor)

PHASE 3 Phase 3 Phase 3 Phase 3 Phase

FREQUENCY

AND VOLT

380-420V 380-420V 208-240V 208-240V

CIRCUIT BREAKER/FUSE(A) 25/20 32/25 32/25 40/30

Inverter Type A/C Power Specifications

 Page 25 

Air Evacuation

Air Evacuation

Safety Precautions

CAUTION

• Use a vacuum pump with a gauge reading
lower than -0.1MPa and an air discharge
capacity above 40L/min.

• The outdoor unit does not need to be
vacuumed. DO NOT open the outdoor
unit’s gas and liquid stop valves.

•

Ensure that the Compound Meter reads

-0.1MPa or below after 2 hours. If after
three hours the gauge reading is still above

-0.1MPa, check if there is a gas leak or
water inside the pipe. If there is no leak,
perform another evacuation for 1 or 2 hours.

•

DO NOT use refrigerant gas to evacuate the
system.

Evacuation Instructions

Before using a manifold gauge and a vacuum
pump, read their operation manuals to make
sure you know how to use them properly.

Manifold Gauge

Compound gauge

-76cmHg

Low pressure valve

High pressure valve

Charge hose

Charge hose

Vacuum pump

Pressure gauge

Low pressure valve

Fig. 9.1

1.

Connect the manifold gauge’s charge hose
to the service port on the outdoor unit’s low
pressure valve.

2.

Connect the manifold gauge’s charge hose
from the to the vacuum pump.

3.

Open the Low Pressure side of the manifold
gauge. Keep the High Pressure side closed.

4.

Turn on the vacuum pump to evacuate the
system.

5. Run the vacuum for at least 15 minutes, or
until the Compound Meter reads -76cmHG
(-1x105Pa).

6. Close the manifold gauge’s Low Pressure
valve and turn off the vacuum pump.

7.

Wait for 5 minutes, then check that there has
been no change in system pressure.

NOTE: If there is no change in system pressure,
unscrew the cap from the packed valve (high
pressure valve). If there is a change in system
pressure, there may be a gas leak.

8. Insert hexagonal wrench into the packed valve

(high pressure valve) and open the valve by
turning the wrench 1/4 counterclockwise.
Listen for gas to exit the system, then close the
valve after 5 seconds.

Flare nut

Cap

Valve body

Valve stem

Fig. 9.2

9.

Watch the Pressure Gauge for one minute to

make sure that there is no change in pressure. It
should read slightly higher than the atmospheric
pressure.

10. Remove the charge hose from the service port.

11. Using hexagonal wrench, fully open both the

high pressure and low pressure valves.

OPEN VALVE STEMS GENTLY

When opening the valve stems, turn the hexagonal
wrench until it hits against the stopper. DO NOT
try to force the valve to open further.

12. Tighten valve caps by hand, then tighten it

using the proper tool.

9

 Page 26 

Air Evacuation

Note On Adding Refrigerant

CAUTION

• Refrigerant charging must be performed after wiring, vacuuming, and the leak testing.

• DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system.

Doing so can damage the unit or impact it’s functioning.

• Charging with unsuitable substances may cause explosions or accidents. Ensure that the
appropriate refrigerant is used.

• Refrigerant containers must be opened slowly. Always use protective gear when charging the

system.

• DO NOT mix refrigerants types.

Some systems require additional charging depending on pipe lengths. The standard pipe length
varies according to local regulations. For example, in North America, the standard pipe length is

7.5m (25’) In other areas, the standard pipe length is 5m (16‘). The additional refrigerant to be
charged can be calculated using the following formula:

Liquid Side Diameter

φ6.35(1/4”) φ9.52(3/8”) φ12.7(1/2”)

R22
(orifice tube in the indoor unit):

(Total pipe length ­standard pipe length)x
30g (0.32oZ)/m(ft)

(Total pipe length ­standard pipe length)x
65g(0.69oZ)/m(ft)

(Total pipe length ­standard pipe length)x
115g(1.23oZ)/m(ft)

R22
(orifice tube in the outdoor unit):

(Total pipe length ­standard pipe length)
x15g(0.16oZ)/m(ft)

(Total pipe length ­standard pipe length)
x30(0.32oZ)/m(ft)

(Total pipe length -
standard pipe length)
x60g(0.64oZ)/m(ft)

(Total pipe length -
standard pipe length)
x65g(0.69oZ)/m(ft)

R410A:
(orifice tube in the indoor unit):

(Total pipe length ­standard pipe length)
x30g(0.32oZ)/m(ft)

(Total pipe length ­standard pipe length)
x65g(0.69oZ)/m(ft)

(Total pipe length ­standard pipe length)
x115g(1.23oZ)/m(ft)

R410A:
(orifice tube in the outdoor unit):

(Total pipe length ­standard pipe length)
x15g(0.16oZ)/m(ft)

(Total pipe length ­standard pipe length)
x30g(0.32oZ)/m(ft)

 Page 27 

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) Indoor and outdoor units are properly

installed.

b) Piping and wiring are properly connected.
c) No obstacles near the inlet and outlet of

the unit that might cause poor performance
or product malfunction.

d) Refrigeration system does not leak.
e) Drainage system is unimpeded and

draining to a safe location.

f) Heating insulation is properly installed.
g) Grounding wires are properly connected.
h) Length of the piping and additional

refrigerant stow capacity have been
recorded.

i) 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 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 off 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

10

 Page 28 

The design and specifications are subject to change without prior notice for product
improvement. Consult with the sales agency or manufacturer for details.

QST2I-045AEN(I)

16123000000713

20160606

 Page 29 

Wiring diagram

Connective wiring diagram

Air Condition Link-Circuit

Power supply:
1-Phase 220-240V~
Use 3-core cable(14AWG)
for the models which with
auxiliary electric heater(PTC);
Use 3-core cable(16AWG)
for the others.

Power supply:
1-Phase 220-240V~
Use 3-core cable(14AWG)
for the models which with
auxiliary electric heater(PTC);
Use 3-core cable(16AWG)
for the others.

INDOOR UNIT

S1

S2

P

Q

INDOOR UNIT

P

Q

S1

S2

L2

L1

L2

L1

L1

L2

L3

N

S1

S2

A

B

C

OUTDOOR UNIT

2-core shielded cable(24AWG)

Power supply:
1-Phase 220-240V~
Use 3-core cable(14AWG)
for the models which with
auxiliary electric heater(PTC);
Use 3-core cable(16AWG)
for the others.

Power supply:
1-Phase 220-240V~
Use 3-core cable(14AWG)
for the models which with
auxiliary electric heater(PTC);
Use 3-core cable(16AWG)
for the others.

INDOOR UNIT

P

Q

S1

S2

L2

L1

INDOOR UNIT

S1

S2

P

Q

L2

L1

OUTDOOR UNIT

S1

S2

L2

L1

Power supply:3-Phase 380-415V~
30K-60K: 5-core cable(14AWG)

Power supply:3-Phase 220V~
30K-60K: 5-core cable(12AWG)

Power supply:1-Phase 220-240V~
18K: 3-core cable(14AWG)
19K-36K: 3-core cable(12AWG)
37K-60K: 3-core cable(10AWG)

L1

L2

L3

N

S1

S2

A

B

C

OUTDOOR UNIT

INDOOR UNIT

S1

S2

L2
L1

2

Use 3-core cable(14AWG)
for the models which with
auxiliary electric heater(PTC);
Use 3-core cable(16AWG)
for the others.

OUTDOOR UNIT

S1

S2

INDOOR UNIT

S1

S2

L2
L1

Use 3-core cable(14AWG)
for the models which with
auxiliary electric heater(PTC);
Use 3-core cable(16AWG)
for the others.

(1)L1

(2)L2

L2

L1

Q

P

Q

P

2-core shielded cable(24AWG)

2-core shielded
cable(24AWG)

Power supply:1-Phase 220-240V~
18K: 3-core cable(14AWG)
19K-36K: 3-core cable(12AWG)
37K-60K: 3-core cable(10AWG)

Power supply:3-Phase 380-415V~
30K-60K: 5-core cable(14AWG)

Power supply:3-Phase 220V~
30K-60K: 5-core cable(12AWG)

(1)L1

(2)L2

2-core shielded
cable(24AWG)

INDOOR UNIT

1 2

3

L1 L 2 S

INDOOR UNIT

Air Condition Link-Circuit

OUTDOOR UNIT

Power supply:3-Phase 380-415V~
5-core cable (14AWG)

Power supply:3-Phase 220V~
5-core cable (12AWG)

L1

L2

L3

N

OUTDOOR UNIT

Power supply:
1-Phase 208-240V~
≤24K : 3-core cable (14AWG)
25K-36K : 3-core cable (12AWG)
≥37K : 3-core cable (10AWG)

4-core cable (16AWG)

4-core cable (14AWG)
(with auxiliary electric heater)

4-core cable (16AWG)

4-core cable (14AWG)
(with auxiliary electric heater)

1 2

3

L1 L 2 S

1 2

3

L1 L2

1 2

3

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

1

2

ON

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

1

2

ON

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

1

2

ON

0

8

4

1

2

3
5

6

7

C

9

A

B

D

E

F

1

2

ON

S1+S 2

0~F 0 ~F 0~F

0~F

NETADD RESS

CODE

0~15

16~3 1

32~4 7 4 8~63

FAC TORY SE TTING

FOR SE TTING N ETADDR ESS

IND OOR UNI T
MAI NBOAR D

CN33

ALAR M

Alar m
Outp ut

16023000007041
WIRING DIAGRAM
(INDOOR UNIT)

DISP LAY

BOAR D

WIRE

CONTR OLLER

10

CN10

5

1

2

ON

1

2

ON

1

2

ON

1

2

ON

EEPRO M
DEFAU LT

FACTOR Y
SETTI NG

FOR TEM P. COMPEN SATION( HEATIN G)

SW6

CODE

6℃

2℃

4℃

T2

T1

CN6

4

BLACK

WHIT E

INDOOR COIL TEMP. SENSOR

ROOM TEMP. SENSOR

CN40

WIRE

CONT ROLLE R

4

CN5

WATER LEVEL SWITCH

CN9

X Y E

To CCM
Comm. Bus

HB HA

CN45

WIRE

CONT ROLLE R

Y/G

CN18

J7

CN23

ON/O FF

Remo te
Cont rol

CN43

FAN FOR T HE
FRESH A IR
OR ANION
GENER ATOR

NOTE:

1.The parts with dotted line indicates
optional features.

2.Remove the short connector of J7
when you use the "on-off" function.

AC FAN

CAP

Y/G

WHITE

WHITE
(GRAY)

CN4

P1

P2

BLACK

BROWN

M

5

3

1

2

ON

1

2

ON

1

2

ON

1

2

ON

SW1

TEL0

24℃

15℃

8℃

EEPRO M

DEFAU LT

FACTOR Y
SETTI NG

FOR ANT I-COL D WIND

1

ON

1

ON

FACTORY SE TTING

FOR SE TTING AU TO-RE START

FOR SE TTING AU TO-RE START

SW3

MODE

AUTO-RE START

NOT AUTO- RESTART

RED

CN2

CN1

BLAC K

CN3

YELL OW(WH ITE)

TO OUTDOOR UNIT

Y/G

1

2 3

Reac tor

CON2

RED

RED

DC MOTO R

DRIVE R MODLE

CON1

FAN1

3

3

M

4

CN1

CN15

CN34

DC FAN

Y/G

MAGNETIC
RING

CN13

M

PUMP

2

Y/G

18K and 24K

36K and 48K

18K and 24K

36K and 48K

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

1

2

ON

0

8

4

1

2

3
5

6

7

C

9

A

B

D

E

F

1

2

ON

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

1

2

ON

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

1

2

ON

S1+S 2

0~F 0 ~F 0~F

0~F

NETADD RESS

CODE

0~15

16~3 1

32~4 7 4 8~63

FAC TORY SE TTING

FOR SE TTING N ETADDR ESS

IND OOR UNI T
MAI NBOAR D

16023000007021 WIRING DIAGRAM

DISP LAY

BOAR D

WIRE

CONTR OLLER

10

CN10

5

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

0

8

4

1

2

3
5

6

7

C

9

A

B

D

E

F

0

8

4

1

2

3
5

6

7

C

9

A

B

D

E

F

0

8

4

1

2

3

5

6

7

C

9

A

B

D

E

F

0

8

4

1

2

3
5

6

7

C

9

A

B

D

E

F

ENC1

4

5

7

8

9

A

B

POWE R

CODE

≤53

54~7 1

72~9 0

91~1 05

106~ 140

141~ 160

≥161

FAC TORY
SET TING

ACCO RDING T O RELATED M ODEL.

FOR SE TTING P OWER( DC MOTO R MODEL O NLY)

1

2

ON

1

2

ON

1

2

ON

1

2

ON

SW1

TEL0

24℃

15℃

8℃

EEPRO M
DEFAU LT

FACTOR Y
SETTI NG

FOR ANT I-COL D WIND

1

2

ON

1

2

ON

1

2

ON

1

2

ON

EEPRO M

DEFAU LT

FACTOR Y
SETTI NG

FOR TEM P. COMPEN SATION( HEATIN G)

SW6

CODE

6℃

2℃

4℃

RED

CN2

CN1

BLAC K

1

ON

1

ON

FACTORY SE TTING

FOR SE TTING AU TO-RE STARTFOR SE TTING AU TO-RE START

SW3

MODE

AUTO-RE START

NOT AUTO- RESTART

T2

T1

CN6

4

BLACK

WHIT E

T2B

CN7

INDOO R COIL OU TLET TEM P. SENSOR

INDOOR COIL TEMP. SENSOR

ROOM TEMP. SENSOR

Y/G

CN18

CN40

WIRE

CONT ROLLE R

4

CN5

WATER LEVEL SWITCH

CN9

X Y E

TO OUTDO OR
COMM .BUS

To CCM
Comm. Bus

S2 S1

CN20

HB HA

CN45

WIRE

CONT ROLLE R

MAGNETIC
RING

CN33

ALAR M

ALARM
OUTPU T

J7

CN23

ON/O FF

REMOT E
CONTR OL

CN43

FAN FOR T HE
FRESH A IR
OR ANION
GENER ATOR

NOTE:

1.The parts with dotted line indicates
optional features.

2.Remove the short connector of J7
when you use the "on-off" function.

1

2

ON

1

2

ON

1

2

ON

1

2

ON

FACTOR Y
SETTI NG

SW5

MO DE

MAINMAIN SLAVE

MAI N
NO SL AVE

FO R MAIN -SL AVE S ETTI NG

L1

L2

Y/G

TO OUTDOOR UNIT

FOR OUTDOOR POWER SUPPLY

POWER

FAN

CAP

Y/G

WHITE

WHITE
(GRAY)

CN4

P1

P2

BLACK

BROWN

M

5

3

CN34

CN13

M

PUMP

2

Y/G

REAC TOR

CON2

RED

RED

DC MOTOR

DRIVE R MODLE

CON1

FAN1

3

3

4

CN1

CN15

FAN

M

3

Y/G

MAGNETIC
RING

MAGNETIC
RING

L1

L2

L1

L2

Test Run

 Page 30 