MDV MDV-D28Q4/N2, MDV-D36Q4/N2, MDV-D45Q4/N2, MDV-D56Q4/N2, MDV-D71Q4/N2 Installation Manual

Digital Scroll Central Air Conditioner
FOUR-WAY CASSETTE TYPE (INDOOR UNIT)

INSTALLATION MANUAL

Model:

MDV-D28Q4/N2 MDV-D36Q4/N2
MDV-D45Q4/N2 MDV-D56Q4/N2

MDV-D71Q4/N2 MDV-D80Q4/N2
MDV-D90Q4/N2 MDV-D112Q4/N2

Please read this installation manual carefully before installing your air conditioner.
Please keep this manual in a safe place for future reference.

CONTENT

PRECAUTION..................................................................................................1

ACCESSORIES................................................................................................1

SAFETY PRECAUTION...................................................................................2

INSTALLATION LOCATIONS..........................................................................3

INDOOR UNIT INSTALLATION........................................................................4

DRAINAGE PIPE INSTALLATION....................................................................6

REFRIGERANT PIPE INSTALLATION.............................................................9

ELECTRIC WIRING........................................................................................11

CONTROL......................................................................................................13

TROUBLE SHOOTING............................................................................ ......15

ELECTRIC THROTTLE PART INSTALLATION....................................... ......15

PRECAUTION

This manual is suitable for indoor unit.
Refer to outdoor unit installation manual to install outdoor unit.

The indoor unit and the outdoor unit should not share one power supply.

ACCESSORIES

Name

Installation manual

Heat insulation pipe

Installation paper
pattern

Fixing screws for paper
pattern

Heat insulation material

Gasket For hanging the body.

Hose band For connecting the drain pipe.

Flexible hose

Heat insulation material For sealing at the piping connection part.

Installation indicator

Quantity

1

2

1

4

1

8

1

1

1

1

Outline

This manual

M5X16

Function

For heat insulation of pipes connection
part.

For illustrating the unit body location on
the ceiling

For installing the paper pattern.

For heat insulation of drain pipe connection
part.

For connecting the drain pipe.

For confirming the location on the ceiling

(With the installation paper pattern).

Electric throttle part

Remote controller subassembly

Drainage plate installation screws

Drain pipe loop

Drain pipe loop bolt

Drain pipe loop bracket

1

1

11

4

1

1

1

Remote control the air-conditioner.

For installing drainage plate.

For installing drain pipe.

For installing drain pipe.

For installing drain pipe.

1

SAFETY PRECAUTION

Read the following "SAFETY PRECAUTIONS" carefully before installation.
The caution items stated here must be followed because these important contents are related
to safety. The meaning of each indication used is as below.
Incorrect installation due to ignoring of the instruction will cause harm or damage, and the
seriousness is classified by the following indications.

WARNING

!

CAUTION

!

NOTE :

1. Injury means causing harmed, burned, electrical shocked, but not serious for hospitalization.

2. Damage of property means disrepair of property, material.

Carry out test running to confirm that no abnormality occurs after the installation. Then, expl­ain to user the operation, care and maintenance as stated in instructions. Please remind the
customer to keep the operating instructions for future reference.

Engage dealer or specialist for installation. If installation done by the user is defective, it
will cause water leakage, electrical shock or fire.

Install according to this installation instructions strictly. If installation is defective, it will
cause water leakage, electrical shock or fire.

Use the attached accessories parts and specified parts for installation. Otherwise, it will
cause the set to fall, water leakage, fire or electrical shock.

This indication shows the possibility of causing death or serious injury.

This indication shows the possibility of causing injury or damage to
properties only.

WARNING

!

Install at a strong and firm location which is able to withstand the set's weight. If the stren­gth is not enough or installation is not properly done, the set will drop and cause injury.

For electrical work, follow the local national wiring standard, regulation and this installa­tion instructions. An independent circuit and single outlet must be used. If electrical circuit
capacity is not enough or defect found in electrical work, it will cause electrical shock or fire.

When carrying out piping connection, take care not to let air or other substances other
than the specified refrigerant go into refrigeration cycle. Otherwise, it will cause lower
capacity, abnormal high pressure in the refrigeration cycle, explosion and injury.

Grounding is necessary. It may cause electrical shock if grounding is not perfect.

Do not install the unit at place where leakage of flammable gas may occur. In case gas
leaks and accumulates at surrounding of the unit, it may cause fire.

2

INSTALLATION LOCATIONS

CAUTIONS

1.Location in the following places may cause malfunction of the machine. (If unavoidable,
please consult your local dealer)

a. A place where there is inflammable gas leakage.
b. There is salty air surrounding(near the coast).
c. There is caustic gas(the sulfide, for example) existing in the air (near a hot spring).
d. A place where can not bear the weight of the machine.
e. In kitchen where it is full of oil gas.
f. There is strong electromagnetic wave existing.
g. There is acid or alkaline liquid evaporating.
h. A place where air circulation is not enough.

2. Electrical Insulation must be done on the air conditioner and the building complying to
National Regulations.

INSTALLATION SPACE

A

Ceiling

MDV-D28(36 45 56 71 80)Q4/N2

MDV-90(112)Q4/N2

Above 100cm

Models

Wall
material

B

C

Up(B)

Sides(C)

Above
100cm

Obstacle

Size A(mm) Ceiling Height

Above 315

Above 365

Fire-proof material
Flammable
material

Above 10cm Above 10cm Above 10cm

Above 5cm Above 5cm

or other nonflammable

materials other than

metal

Above
100cm

HEIGHT BETWEEN CEILING AND FLOOR

Height(m)

Models

Models

MDV-D28(36)Q4/N2

MDV-D28(36)Q4/N2

MDV-D45-80Q4/N2

Height(m)

Below 2.7

Below 2.7

Below 3.5

Below 3.5

Installation height

2.7m<h<3m

28-36Q4/N2

Model (MDV-D)

45-80Q4/N2

Fire-proof
structure

90-112Q4/N2

MDV-D90-112Q4/N2

Below 4

Below 4

2.7m<h<3m

3m<h<3.5m

3

INDOOR UNIT INSTALLATION

!

CAUTION

Please select a place where sound enough
to bear the indoor unit when installation

The Indoor Unit is possible to fall if the place
is not sound enough.

To take precautions against typhoon/earth
quake.

Be sure to install strictly according to related
specification. Wrong installation will
cause the unit to fall.

Model(MDV-D)

28~36Q4/N2

ABCDEF

940

880

820

620

405

400

71~80Q4/N2

90~112Q4/N2

1350

1290

1230

1030

610

605

Drain side

A

D(Hook-location)

C (Body)

B (Ceiling hole)

A(Panel)

130

32 18

Piping side

800 (Hook-location)

Hole

(f100)

800 (Body)

940 (Panel)

880(Ceiling hole)

Model(MDV-D)

28~45Q4/N2
56~80Q4/N2

90~112Q4/N2

7

30

Panel

Below the ceiling

GHIJKLM

536

260

320

106

946

106

Hole

130

180

f9.5

f19.0

Hook(on Field)

30

20

39

136

196

246 186

G

138

130

200

80

240

II

128

Humidifier hole (inside)

Drainage pipe installation hole (f32

300

Wiring hole ( )

f38

Below the ceiling

185
170

100

Gas side (k)f

(Liquid side fJ)

)

73

200

140

Select installation location considering piping and wiring connection after the Indoor Unit has
been hanged. Then decide the piping wiring leading direction.

Be sure to lead the refrigerant pipes, drain pipes and connection wires out to its connection
location before hanging the unit if the opening on the ceiling has been decided.
Confirm sizes of the indoor unit and ceiling opening with the attached installation paper
pattern. (Please fix the paper pattern below the body with M5X16 screws (4).)

4

CEILING HOLE AND THE HOOK INSTALLATION

Preparation Work on the Ceiling

Installation method should be changed under the different construction structure. Please consult
the professional for the detailed information.
After opening a hole, the ceiling should be horizontal and strong to prevent vibration.

1

Cut the beams at the hole and remove them.

2

Reinforcing the beams that have been cut and the beams fixing the ceiling .

Installation of the hanging screw bolt

Bolt with M10 whorl is to be used. The center distance between the bolts is decided by the size of the
unit . Use the following method to install:

Wooden construction

Put the square timber over the roof beam,

New Concrete Bricks

Inlaying or embedding the screw bolts.

then install the hanging screw bolts.

Timber over the beam

Roof beam

Ceiling

Hanging Screw

For finished concrete bricks

Install the hanging hook with expansible

Bolt

Steel roof beam structure

Install the supporting angle steel.
bolt into the concrete deep to 45~50mm
to prevent loose.

Overhanging the indoor unit

Adjust the gasket (down side) to 138mm over the ceiling.

(Blade shape
insertion)

(Pipe hanging and embedding
screw bolt)

Hanging bolts

(Slide insertion)

Steel bar

Embedding screw bolt

Hanging screw bolt

Supporting
angle steel

Hanging Bolt

Nut (Up Side)

Gasket (Up Side)

Installing Ear

Gasket (Down Side)

138mm

Down side of the ceiling

Nut (Down Side)

5

Install the hanging bolt into T groove of the hanging tool. Overhang the indoor unit and ensure
it is level using a level indicator.

Level Indicator

Hanging Screw Bolt

Hanging Screw Bolt M10

Locking Nut M10

Hanging Ear

f10 Gasket

Install it down the
installing-ear

Tighten nut M10

Indoor Unit

Ceiling

Installation Plate

2

30mm

43mm

1

PANEL INSTALLATION (SOLD SEPARATELY)

Panel installation should be done after piping and wiring.
Refer to panel installation manual for detailed information about installing the panel.
Be sure that the indoor unit and ceiling hole installation size is right before installation.

CAUTION

Be sure to seal the connection parts between - and the panel - the
indoor unit ,or even small gaps may cause wind/water leakage or condensing water.

the panel the ceiling

DRAINAGE PIPE INSTALLATION

CAUTION

Be sure to follow this Installation Manual during drainage installation,
the drainage pipe must have the heat insulation to prevent condensing.

!

CAUTION

The drain pipe of indoor unit must have the heat insulation , or it will condense dew, as well as the
connections of the indoor unit.
The declivity of the drain pipe downwards should not be over 1/100, and no winding and bending.
The total length of the drain pipe when pulled out traversely shall not exceed 20m , when the
pipe is over long, a prop stand must be installed every 1.5 to 2m to prevent winding.
Refer to the following figures about the installation of the pipes.
Do not impose any pressure on the connection part of the drainage pipe.

6

1.5m~2m

Support

As long as possible about (10mm)

Bend
Up and Down

FoldLean Downward over 1/100

Lean Downward
over 1/100

VP30

Drainage Pipe Material, Heat-insulating Material

The listed material should be used:

Drainage Pipe
Material

Heat Insulation
Material

Polyvinyl chloride pipe (f32mm outer diameter)

Foamed polyethylene insulation plate (10mm thickness)

Flexible Hose

Measure diameter of the hard pipe using cutting method, and adjust the joining angle.

Pull out the flexible hose, do not over deform than illustrated below.
Be sure to bind it with the attached band.
Please place the flexible hose horizontally.

Core shift adjustment

20

Hose band

Bend 45 C(Maximum)

o

Flexible Hose

Indoor Unit

o

45

Connection Procedure

Connect the transparent pipe with the polyvinyl chloride pipe.

Use polyvinyl chloride glue at the connection part of the drainage pipe, be sure no water
leakage.
Paste glue at the front 40mm of the polyvinyl chloride pipe, insert it into the transparent pipe.
It needs 10 minutes for the glue to dry. Do not impose pressure on the connection during the
drying period.

7

Heat Insulation

Wrap the flexible hose carefully with the attached heat insulation material from the start to the
end (to indoor part)

Flexible Hose

Hose band

Attached Heat-insulation
Material

Heat-insulation
Material

Polyvinyl Chloride PipeField-arranged

Drainage Upward

To make sure that the drainage pipe would not slant
downward, lead it upward to a height 360mm maximum,
then downward lead it.

Below 360mm

Below
100mm

Indoor Unit

Below 600mm

Ceiling

Drainage Test

Check whether the drain pipe is unhindered before testing.

1) Stow water from sprue to check.

2) Stow 600cc water with pot or hose from sprue slowly , preventing touching the drain pump motor.

N

3) After the preparation work , disconnect the water level switch ,power 220-240VAC to of terminal

L

board, and the drain pump start up immediately.

4) After drain pump run 2 min.,reset the water level pin, and the drain pump motor will stop after
running 1 min..

.

Drain pipe connection

Sprue

Motor Sound Test

The drainage test is doing during checking the drain pump motor running sound .

Reset the water level switch connection to the original position after the drainage test .

8

REFRIGERANT PIPE INSTALLATION

!

CAUTION

Ventilate the air if there was any refrigerant leakage during the installation.

Leaked refrigerant will generate poisonous gas if meeting fire.

Make sure there is no refrigerant leakage after the installation.

Leaked refrigerant will generate poisonous gas if meeting fire.

Allowed Length and Drop of Pipes

Requirements are different when installing the outdoor unit, please refer to outdoor unit
installation manual for detailed information.

Material and Size of the Pipes

Three length (3m,5m,10m) of pipes are available to purchase.

Copper Pipe for Air ConditionerPipe Material

Size(mm)

Gas side

Liquid side

Refrigerant Volume to Be Added

Refrigerant volume to be added is calculated according to outdoor unit installation manual (R407C).
Be sure to add refrigerant measuring by a scale.

f19

f9.53

CAUTION

If the added refrigerant volume is inadequate (too much or insufficient), the compressor
malfunction will be caused. Be sure to calculate the refrigerant volume carefully.
The service man should write down the piping length and the added refrigerant volume
in the nameplate, which is on the electric control box cover of outdoor unit, for
diagnosing the compressor and refrigeration circulation malfunction.

Connection of the Refrigerant Pipe

Double-span should be used when connecting the pipes.
The wrench torque follow the below table:

Pipe external diameter wrench torque Added wrench torque

F

F

9.5

19.0

24.5(2.5kgf.m)

98.8(10.0kgf.m)

29.4(3.0kgf.m)

117.7(12.0kgf.m)

9

Air Purging

Use a vacuum pump, to vacuum from the gas side refrigerant adding mouth of the outdoor
unit.

Don t use the refrigerant of the outdoor unit to do the vacuum. (A certain volume of refrigerant
had been added into the outdoor unit in factory.)

Open/Close the valves

Open/Close the spools or the valves of outdoor unit with a f5mm hexagon spanner.

Leakage Test

Test if there is any leakage on the connections of the piping with soap water.

Heat Insulation

Heat insulation for the gas and liquid pipe separately.
Heat insulation should be fully and carefully done, because the liquid side pipe and gas side
pipe are easy to condense water due to low temperature when cooling.
Heat proof above 120 C material should be used at the gas side pipe.

O

The indoor unit connection parts should be no-gap heat-insulated with the attached heat insulation
materials.

Unit Body

Wrap to the foot of the piping

Field Piping side

Attached Heat Insulation Material

10

ELECTRIC WIRING

!

WARNING

Specified power cables should be used. Do not apply any pressure on the
terminals used to connect.

Improper connection may cause fire.

Grounding must be properly done.

The grounding wire should be away from gas pipes, water pipes, telephone,
lightening rods or other grounding wires. Improper grounding may cause electric
shock.

Electric Wiring must be done by professionals. Use a separate circuit according
to national regulations.

If the wiring capacity is not enough, electric shock or fire may occur.

CAUTION

Be sure to Install Current Leakage Protection Switch. Or electric shock may occur.

CAUTION

Power cord is to be selected according to national regulations.
Outdoor unit power cord should be selected and connected according to the outdoor unit
installation manual.
Wiring should be away from high temperature components, or the insulation layer of the
wires may melt down.
Use wire clamp to fix the wires and terminal block after connection.
Control wire should be wrapped together with heat insulated refrigerant pipes.
Connect the indoor unit to power only after the refrigerant has been vacuumed.

Don t connect the power wire to the signal wire connection end.

11

Wiring Specifications

Wiring specifications are listed below, insufficient capacity would over-heat the wire or destroy
the machine.

Model

MDV-D28~112Q4/N2

Items

Power Cord of the Indoor Unit

Power

Single Phase

220-240V~

Power Switch Power Cord

Capacity Fuse Below 20m

15A

50Hz

15A

Twisted-pair

2

2mm

Below 50m

Twisted-pair

6mm

Control Wire

Indoor/Outdoor Unit
Signal Wire

Diameter

Quantity

Not longer than 1500m

2

2

2-core screened wire

2mm

Ground
Wire

Single-

2

Wire

mm

f1.5

Note: This wiring specification is only for the reference ,please refer to the specified model and the
related electric standard to do the wiring.

Indoor unit power supply and the signal wire wiring

The indoor unit power source should not be shared with outdoor unit.
The indoor units that connect to the same outdoor unit should use the same power source, creepage
protector and main switch.
The indoor power wire should be connected to the L N terminal , and the indoor/outdoor signal wire
should adopt the 2-core screened wire . The indoor /outdoor signal wire should be connected to
A B terminal and should be corresponding with the A B of the outdoor terminal. Connect the
screened layer to (E).

Outdoor Unit

Outdoor Power
Supply

Creepage Protection
Switch

380V ~

Ground Wire

Ground Wire

Wire Distribution Box

Indoor/Outdoor
Signal wire
(2-cord screened wire)

Indoor Power
Supply

220-240V~ 50Hz

Creepage Protection
Switch

Indoor Unit

Indoor Unit

Connect to close end
of the screened wire

12

Indoor/Outdoor Unit Signal Wire

Connect the wire according to their numbers.
Wrong connection may cause malfunction .

Wiring Connection

Seal the wiring connection with the insulation material , or the condensing dew will be caused.

Panel Wiring

Connect the Swing Motor terminal block according to the Panel Installation Manual.

Terminal Board Diagram

Please refer to the indoor unit wiring diagram for the wiring.

Single phase indoor unit

L N

To indoor power
220-240V~50Hz

P Q

Indoor/outdoor
connection wire

(E)

Please adopt the screened wire, and connect the
screened layer to (E)

CONTROL

As per the different usages to set the moving switch on the PCB in the electric control box of indoor
unit.
After the setting , be sure to cut down the main power supply switch , then turn it on again
Setting would be invalid without disconnecting the power.

Please number the indoor units during the installation . For example, for the first outdoor unit ,the number
of the first indoor unit is 1-1, the second indoor unit is 1-2, and the set address is 1 and 2
respectively , the others is analogical.

0

1

2

F

E

D

C

3

4

5

B

6

7

A

8

9

0

1

2

F

E

D

C

3

4

5

B

6

7

A

8

9

ENC2 ENC1

13

ENC1

'0-F' show the address '0-F' respectively, that is, '0-15' indoor unit (together 16
units), and the others follow the analogy. If two addresses are the same in
one system , the abnormal operation will occur.

TOGGLE SWITCH FOR SETTING ADDRESS

ENC2

Note: The horsepower
has been set before
leaving the factory ,
anyone can t
modify it except the
maintenance person.

Toggle switch

Code

0

1

2

3

4

5

For set horsepower

Capacity(Horsepower)

2200W(0.8HP)

2800W(1.0HP)

3600W(1.2HP)

4500W(1.5HP)

5600W(2.0HP)

7100W(2.5HP)

6

7

8

9

14

8000W(3.0HP)

9000W(3.2HP)

11200W(4.0HP)

14000W(5.0HP)

TROUBLE SHOOTING

No.

1

2

3

Typ e

Malfun­ction

Malfun­ction

Malfun­ction

Contents

The evaporator sensor
check point is abnomal ,
or room temp.sensor is
abnormal.

Indoor/outdoor unit com­munication is abnormal.

Condenser sensor check
point is abnormal or outdoor

sensor is abnormal.

temp.

LED Lamp flash

Run lamp flashes
at 2.5Hz.

The timer lamp fla­shes at 2.5Hz.

All the indoor alarm
lamps flash at 0.5Hz.

Alarm lamp flashes

4

5

Malfun­ction

Alarm

Water level switch is
abnormal

Mode conflict

at 2.5Hz.

Defrost lamp
flashes at 2.5Hz.

INSTALL ELECTRIC THROTTLE PART

Please refer to the following figures to install.
The installation size is as follows:

266

Indoor unit input pipe

Electric throttle part wires group

Remarks

After the malfunctions
disappear, it restores
automatically.

After the malfunctions
disappear, it restores
automatically.

After the malfunctions
disappear, it restores
automatically.

If the malfunctions can t
be solved in three min.
all the indoor alarm
lamps flash at 0.5Hz.
Turn off the power to restore.

When the indoor unit turns
to heating mode or is turned
off, the alarm will disappear.

Run lamp

Timer lamp

Defrost lamp

Alarm lamp

Manual Switch

Vertically upward install

165

Electric throttle part pipe joint

5

7

215

NOTE

The electric throttle part should be installed vertically upward ,the slant and invertion are not allowed.

Use two spanners to connect the electric throttle parts with indoor/outdoor pipes to avoid the copper pipe cracking.

Please pay attention to the connection orientation when connecting.(Refer to the label sticking on the electric throttle part.)

The size of electric throttle part : 215(L)X165(W)X75(H)mm.

The electric throttle part wires group connector is corresponding to the connector CN 15 on the indoor PCB.

Indoor unit input pipe joint

Electric throttle part pipe joint

Connection pipe copper nut joint

15

6292aW