Midea MLCAC-UTSM-2010-10, MOUB-36HDN1-R, MOU-48HDN1, MOUB-48HDN1-R, MOUB-36HDN1-Q Service Manual

MIDEA LCAC

50Hz R410A DC Inverter

Service Manual

2011

MLCAC-UTSM-2010-10 Contents

Part 1 General Information ................................................................................................. 1

Part 2 Indoor Units .............................................................................................................. 6

Part 3 Outdoor Units ......................................................................................................... 67

Part 4 Installation .............................................................................................................. 96

Part 5 Control ................................................................................................................... 107

※The specifications, designs, and information in this book are subject to change without notice for
product improvement.

Contents i

MLCAC-UTSM-2010-10 General Information

Part 1

General Information

1. Model Names of Indoor/Outdoor Units ........................... 2

2. External Appearance ........................................................ 3

2.1 Indoor Units ................................................................................. 3

2.2 Outdoor Units .............................................................................. 3

3. Nomenclature .................................................................... 4

4. Features ............................................................................. 5

General Information 1

Model Names of Indoor/Outdoor Units MLCAC-UTSM-2010-10

Model Names of Indoor/Outdoor Units

1.1 Indoor Units

R410A (capacity multiplied by 1000Btu/h)

Type Function 36 48
Four-way cassette Cooling and heating √ √
Duct Cooling and heating √ √
Ceiling & floor Cooling and heating √ √

1.2 Outdoor Units

Model of outdoor unit and corresponding indoor unit

Universal Outdoor unit Model Compressor type Compressor Brand Matched indoor units

MOUB-36HDN1-Q Rotary DC Inverter GUANGZHOU MITSUBISHI

MOUB-36HDN1-R Rotary DC Inverter GUANGZHOU MITSUBISHI

MOU-48HDN1 Rotary DC Inverter GUANGZHOU MITSUBISHI

MOUB-48HDN1-R Rotary DC Inverter GUANGZHOU MITSUBISHI

MTB-36HWDN1
MUB-36HRDN1
MCC-36HRDN1

MTB-48HWDN1
MUB-48HRDN1
MCC-48HRDN1

2 General Information

MLCAC-UTSM-2010-10 External Appearance

External Appearance

2.1 Indoor Units

Duct

Ceiling & Floor

Four-way Cassette

2.2 Outdoor Units

MOUB-36HDN1-R

MOUB-36HDN1-Q,

MOU-48HDN1, MOUB-48HDN1-R

General Information 3

Nomenclature MLCAC-UTSM-2010-10

Nomenclature

1.1 Indoor Unit

M U B - 18 H R D N1

Refrigerant Type
N1 R410A

DC Inverter

Control Mode
R Remote Control

Function Code
C cooling Only
H cooling & Heating

Capacity (¡ Á1000Btu/h)

Product Series
A First Time Design B Second Time Design
C Third Time Design

3.2 Outdoor Unit

M O U D - 60 H D N1- R

Product Category
C Cassette Type
T Duct Type
U Ceiling & Floor Type
H High Static Pressure Duct Type

Midea

Power Supply
R 380~415V, 3N, 50Hz

-- 220~240V, 1N, 50Hz

Refrigerant
N1 R410A

DC Inverter

Function Code
C cooling only H cooling & heating

Capacity (¡ Á1000Btu/h)

Product Series
A Time A Designed B Time B Designed

C Time C Designed D

F Console Type

Time D Designed

Universal Outdoor Unit
O Outdoor unit U Universal

Midea

4 General Information

MLCAC-UTSM-2010-10 Features

Features

4.1 Universal outdoor unit design
Indoor unit with the same capacity can match with the same outdoor unit.

4.2 High efficiency and energy saving.

Thanks to the DC inverter technology and optimized piping system, the EER and COP of whole

series can easily reach A-class.

4.3 Low noise and low starting current.

Thanks to the DC inverter technology, the system can work with low noise, and very small starting

current.

4.4 Intelligent refrigerant adjustment technology.

Throttle part is made up of capillary and electronic expansion valve (EXV). The outdoor unit can

output the most accurate capacity in any condition.

4.5 Working in cooling mode under -15℃.
Outdoor unit built-in with low ambient kit, it can control the outdoor unit’s fan and cooling can be

performed throughout the year for computer rooms, banquet halls, etc. Wide operation range
covers outdoor temperatures as low as -15℃ for cooling.

4.6 Indoor & outdoor unit’s power supply is separate.

4.7 All indoor units have network control function.

4.8 All indoor units have Auto-restart function.

General Information 5

Indoor Units MLCAC-UTSM-2010-06

Part 2

Indoor Units

Four-way Cassette Type ....................................................... 7

Duct Type ............................................................................. 20

Ceiling & Floor Type ........................................................... 31

6 Indoor Units

MLCAC-UTSM-2010-10 Four-way Cassette Type

Four-way Cassette Type

1. Features ........................................................................... 8

2. Dimensions .................................................................... 11

3. Service Space ................................................................ 12

4. Wiring Diagrams ........................................................... 13

5. Air Velocity and Temperature Distributions ............... 14

6. Electric Characteristics ................................................ 15

7. Sound Levels ................................................................ 15

8. Accessories ................................................................... 16

9. The Specification of Power .......................................... 17

10. Field Wiring ................................................................... 18

Four-way Cassette Type 7

Features MLCAC-UTSM-2010-10

1. Features

(1) Low operation noise

—Streamline plate ensures quietness
—Creates natural and comfortable environment

(2) Efficient cooling——Equal, fast and wide range cooling

(3) Excellent performance. The optimal evaporator & sufficient airflow volume guarantees the excellent

capacity

(4) The adoption of the most advanced 3- Dimensional Screw fan

—Reduces the air resistance passing through
—Smoothes the air flow
—Makes air speed distribution to the heat exchange uniform

(5) Fresh air makes life healthier and more comfortable.

(6) Drainage pump can take up the condenser water to 750mm.

(7) Ultra thin machine body to easy installation and maintenance. 18K~24K:230mm, 36~48K:300mm.

8 Four-way Cassette Type

MLCAC-UTSM-2010-10 Features

(8) Different color panels for choose: White、Gray、Blue、Black

(9) Swing angle of louver

1) Add one more swing motor, one motor driving two louvers. Controlling the interspace of each part,
minimizing the angle loss.

2) The swing angle of the first louver are 40~42 degrees and the second louver are 37~38 degrees.
New evaporator and inner configuration designed can acquire high heat-exchanger effect.

(10) More strengthening rib design around the panel, preventing the distortion for the panel.

(11) New outlet frame design to make the phenomena of coagulation great improvement: prevent the

condensing water from damaging the air guide strip.

(12) Adding rib on the panel of fan outlet, which can avoid the air outlet direct flow to people.

(13) 4 speeds available, optional super high fan speed design suitable for the large building over 3m high.

(14) Adding digital tube displaying on the display board. LED can display the Error Code to make the

malfunction checking easier.

Four-way Cassette Type 9

Features MLCAC-UTSM-2010-10

(15) Reserve spaces for air side-outlet, it is available to connect duct pipe hence air supplying from the four

sides to nearby small room..

(16) The connecting pipe and drop height is higher. Max. pipe length up to 50m（refer to ①）, and Max. drop
height up to 30m（refer to ②）.

(17) Optimal design, smaller Control Box, Space saving and convenient for wiring,
Using fire resistance galvanized steel for E-box material. Metal box make the control part more stable and
prevent damaging.

(18) 360°air flow panel : 360°air flow delivery ensures uniform airflow distribution(optional)

10 Four-way Cassette Type

MLCAC-UTSM-2010-10 Dimensions

2. Dimensions

Unit: mm

MODEL(Btu/h) A B C H
36000 300 Ф15.9 Ф9.5 >330
48000 300 Ф15.9 Ф9.5 >330

Four-way Cassette Type 11

Service Space MLCAC-UTSM-2010-10

3. Service Space

12 Four-way Cassette Type

MLCAC-UTSM-2010-10 Wiring Diagrams

4. Wiring Diagrams

MCC-36HRDN1、MCC-48HRDN1

Four-way Cassette Type 13

Air Velocity and Temperature Distributions MLCAC-UTSM-2010-10

5. Air Velocity and Temperature Distributions

Airflow velocity

High pressure switch

T5

Discharge temp. sensor

Oil s epar ator

Filter

Compressor

Low pressure

Condenser

Ambient temp. sensor

4-way valve

Oil return
Capillary

Filter

Low pressure l iqui d
accumulator

switch

Condenser temp. sensor

T3

Filter

T4

Outdoor unit

Electronic
expansion valve

Capillary

Filter

Evaporator

Evaporator temp. se nsor

Room temp. sensor

Indoor uni t

T2

T1

14 Four-way Cassette Type

MLCAC-UTSM-2010-10 Electric Characteristics

6. Electric Characteristics

Power

Supply

Model

MCC-36HRDN1 50 220-240 198 254 15
MCC-48HRDN1 50 220-240 198 254 15

Remark:
MFA: Max. Fuse Amps. (A)

Indoor Unit

Hz Voltage Min Max MFA

7. Sound Levels

Model

MCC-36HRDN1 44 42 41
MCC-48HRDN1 44 42 41

H M L

Noise level dB(A)

Four-way Cassette Type 15

Accessories MLCAC-UTSM-2010-10

8. Accessories

Name Shape Quantity

INSTALLATION FITTINGS

Tubing & Fittings

Installation paper board

Soundproof / insulation sheath

Connecting pipe group 1

1

2

Drainpipe Fittings

Remote controller & Its
Frame

Others

Installation accessory
(The product you have
might not be provided the
following accessories

Out-let pipe sheath

Out-let pipe clasp 1

Drain joint 1

Seal ring 1

Remote controller & Its Frame

Remote controller holder 1

Mounting screw(ST2.9×10-C-H) 2

Alkaline dry batteries (AM4)

Owner's manual 1

Installation manual 1

Expansible hook

Installation hook

Orifice

1

1

2

4

4

1

16 Four-way Cassette Type

MLCAC-UTSM-2010-10 The Specification of Power

9. The Specification of Power

Four-way Cassette Type 17

Field Wiring MLCAC-UTSM-2010-10

10. Field Wiring

Wiring chart

18 Four-way Cassette Type

MLCAC-UTSM-2010-10 Field Wiring

Four-way Cassette Type 19

Duct Type MLCAC-UTSM-2010-10

Duct Type

1. Features ......................................................................... 21

2. Dimensions .................................................................... 22

3. Service Space ................................................................ 23

4. Wiring Diagrams ........................................................... 24

5. Static Pressure .............................................................. 25

6. Electric Characteristics ................................................ 25

7. Sound Levels ................................................................ 26

8. Accessories ................................................................... 27

9. The Specification of Power .......................................... 28

10. Field Wiring ................................................................... 29

20 Duct Type

MLCAC-UTSM-2010-10 Features

1. Features

● New structure design.

● Built-in drainage pump (Optical).

● Two air intake ways: from below or rear (standard).

● Wire controller is standard.

● Three speeds indoor unit.

● Fresh air inlet hole is reserved.

Duct Type 21

Dimensions MLCAC-UTSM-2010-10

2. Dimensions

Capacity

(KBtu)

MTB-36HWDN1 1140 270 775 710 65 933 35 179 1035 260 20 1180 490

MTB-48HWDN1 1200 300 865 800 80 968 40 204 1094 288 45 1240 500

22 Duct Type

Outline

dimension(mm)

A B C D E F G H I J K L M

Air outlet o

pening size

Air return

opening size

Size of outline dimension mounted

plug

MLCAC-UTSM-2010-10 Service Space

3. Service Space

Ensure enough space required for installation and maintenance.

All the indoor units reserve the hole to joint the fresh air pipe. The hole size as following:

Duct Type 23

Wiring Diagrams MLCAC-UTSM-2010-10

4. Wiring Diagrams

MTB-36HWDN1 MTB-48HWDN1

D M

Y/G

TR

XS1
XP1

BLAC K

BLUE

RED

L

IND OOR POWE R

CN 11

CN 1

C N13

CN2

P3

P2

CH

Ｈ

BR OWN

BLAC K

N

WHIT E

NOT E:PL EASE USE SHI ELDE R WI RE F OR C OMM .BUS WIR E,

202070390385

CODE

FM
DM
CS
H/P2
CH /P3

T1

T2B

T2
XP 1-4
XS 1-4
TR

ENC 2

' 0～F' o f t he E NC2 an d 'O N/ OFF '

respectively.

respectivel y.

ENC1

T ITLE

FAN MOTO R

PU MP MOTOR

WATER L EVEL SWI TCH
HIGH FAN

SUPER HI GH FAN
R OOM TEMP .
O UTER PIP E TE MP.

MIDDLE P IPE TEMP .

CON NECT ORS

TRANSFOR MER

FUNCTION OF SWITCH

SWITCH

SWITCH

SWITCH
NUMBER

4

5
7
8

9

(FOR INDOOR UNIT
ADDRESS)

(FOR CCM UNIT
ADDRESS)

(FOR POWER)

PO W E R

5300W
5600W
7100W
9000W

10500W
140 00W
160 00W

SW 1

of t he Sw1 m ean th e add res se s

of the different units,

S1
S2

'0～F' of t he S2 and 'ON/OFF'

of the S1 mean the addresses
of the different net units,

S3

WHITE

ENC1

SW1

MAIN BOARD

CN 4

XP4 X S4

Y/G

FM

ENC2

BLA CK

DIS PLAY BOAR D

CN1 0

CN9

S2

S1

33CN

C S

BLA CK

CN1 7

CN7

CN 6

23CN

CN5

E RROR
O UTPU T

CN5

CN 3

W HITE

T1

ON/OFF

REMOTE
CONTROL

BLAC K

XP3 XS3

T2

CN2CN 4

XY

TO CCM
CO MM.BUS

XS2

XP2

T2B

CN 1

EPQ

TO OUTD OOR
COM M.BU S

TO WIRE
CONTROLLER

EALARM

24 Duct Type

MLCAC-UTSM-2010-10 Static Pressure

5. Static Pressure

MTB-36HWDN1 MTB-48HWDN1

Pa

90

80

70

60

50

40

External static pressure (Pa)

30

20

10

1200

1100

Super high speed

High speed

1800

Air volume(m

Mid speed

Low speed

2000

3

/h)

220016001400

2400

Pa

120

110

100

90

80

70

60

50

40

External static pressure (Pa)

30

20

10

1000

1300

19001600

Air vo lume(m

Super high speed

High speed

Mid speed

Low speed

2500

2200

3

/h)

2800

3100

6. Electric Characteristics

Model

MTB-36HWDN1 50 220-240 207 253 15

MTB-48HWDN1 50 220-240 207 253 15

Remark:

MFA: Max. Fuse Amps. (A)

Hz Voltage Min. Max. MFA

Indoor Unit Power Supply

Duct Type 25

Sound Levels MLCAC-UTSM-2010-10

7. Sound Levels

Concealed Duct Type

Discharge

Suction

DuctDuct

1.4m

Microphone

Model

MTB-36HWDN1 46 44 42

MTB-48HWDN1 47 45 43

H M L

Noise level dB(A)

26 Duct Type

MLCAC-UTSM-2010-10 Accessories

8. Accessories

Name Shape Quantity

Tubing & Fittings

Drainpipe Fittings
(for cooling & heating)

Remote controller ＆ Its Frame

Soundproof / insulation sheath

Binding tape

Seal sponge

Drain joint

Seal ring

Remote controller

Frame

Mounting screw(ST2.9 10-C-H)

Alkaline dry batteries (AM4)

Remote controller manual

2

1

1

1

1

1

1

2

2

1

Wired controller & Its Frame

Others

EMS & It’s fitting

Wired controller

Owner，s manual

Installation manual

Magnetic ring (twist the electric wires L
and N around it to five circles)

1

1

1

1

Duct Type 27

The Specification of Power MLCAC-UTSM-2010-10

9. The Specification of Power

28 Duct Type

MLCAC-UTSM-2010-10 Field Wiring

10. Field Wiring

Duct Type 29

Field Wiring MLCAC-UTSM-2010-10

Air-conditioner link-circuit.

30 Duct Type

MLCAC-UTSM-2010-10 Ceiling & Floor Type

Ceiling & Floor Type

1. Features ........................................................................... 32

2. Dimensions ...................................................................... 56

3. Service Space .................................................................. 58

4. Wiring Diagrams ............................................................. 59

5. Air Velocity and Temperature Distributions ................. 60

6. Electric Characteristics .................................................. 62

7. Sound Levels ................................................................... 62

8. Accessories ..................................................................... 63

9. The Specification of Power ............................................ 64

10. Field Wiring ................................................................... 65

Ceiling & Floor Type 31

Features MLCAC-UTSM-2010-10

1. Features

1.1. New design, more modern and elegant appearance.

1.2. Convenient installation

--The ceiling type can be easily installed into a
corner of the ceiling even if the ceiling is very narrow

--It is especially useful when installation of an air conditioner in the center of the ceiling is impossible
due to a structure such as one lighting.

1.3. Two direction auto swing (vertical & horizontal) and wide angle air flow,

--Air flow directional control minimizes the air resistance and produces wilder air flow to vertical
direction.

--The range of horizontal air discharge is widened which secures wider air flow distribution to provide
more comfortable air circulation no matter where the unit is set up

1.4. Three level fan speed, more humanism design, meets different air-supply requirement.

1.5. Water proof by utilizing the absorbing plastic film on water collector

1.6. Easy operation. Auto-restart function, remote control and optional wire control method.

1.7. Low noise level plus compact size

--Shape of the blades has been improved to prevent noise caused by turbulence.

32 Ceiling & Floor Type

Dimensions MLCAC-UTSM-2010-10

2. Dimensions

a. Wall mounting installation

b. Ceiling installation

56 Ceiling & Floor Type

MLCAC-UTSM-2010-10 Dimensions

Capacity(Btu/h) A B C D E F G H

MUB-36HRDN1 1280 660 206 795 506 1195 200 203

MUB-48HRDN1 1670 680 244 1070 450 1542 200 240

Ceiling & Floor Type 57

Service Space MLCAC-UTSM-2010-10

3. Service Space

58 Ceiling & Floor Type

MLCAC-UTSM-2010-10 Wiring Diagrams

4. Wiring Diagrams

MUB-36HRDN1、MUB-48HRDN1

Ceiling & Floor Type 59

Air Velocity and Temperature Distributions MLCAC-UTSM-2010-10

5. Air Velocity and Temperature Distributions

Discharge angle 60° (CEILING)

Airflow velocity

High pressure switch

T5

Discharge temp. sensor

Filter

Compressor

Oil separator

Oil return
Capillary

Filter

Low pressure

switch

4-way valve

Low pressure liquid
accumulator

Condenser

Condenser temp. sensor

T4

Ambient temp. sensor

Outdoor unit

Electronic
expansion valve

T3

Capillary

FilterFilter

Evaporator

Evaporator temp. sensor

Room temp. sensor

Indoor unit

T2

T1

60 Ceiling & Floor Type

MLCAC-UTSM-2010-10 Air Velocity and Temperature Distributions

Discharge angle 60°(FLOOR)

Airflow velocity

Temperature

Ceiling & Floor Type 61

Electric Characteristics MLCAC-UTSM-2010-10

V

6. Electric Characteristics

Indoor Unit Power Supply

oltage Min Max MFA

MUB-36HRDN1 50 220~240 198 254 15
MUB-48HRDN1 50 220~240 198 254 15

Remark:

MFA: Max. Fuse Amps. (A)

Model

Hz

7. Sound Levels

Ceiling Floor

Model

MUB-36HRDN1 45 43 40

MUB-48HRDN1 47 46 44

H M L

Noise level dB(A)

62 Ceiling & Floor Type

MLCAC-UTSM-2010-10 Accessories

8. Accessories

Name Shape Quantity

Installation fittings

Remote controller & Its
holder

Others

1.Hook 2

2.Hanging arm

3. Remote controller

4. Remote controller holder 1

5. Mounting screw (ST2.9×10-C-H) 2

6. Alkaline dry batteries (AM4) 2

7. Owner's manual

8. Installation manual

9. Remote controller manual

2

1

1

1

1

Ceiling & Floor Type 63

The Specification of Power MLCAC-UTSM-2010-10

9. The Specification of Power

64 Ceiling & Floor Type

MLCAC-UTSM-2010-10 Field Wiring

10. Field Wiring

Ceiling & Floor Type 65

Field Wiring MLCAC-UTSM-2010-10

66 Ceiling & Floor Type

MLCAC-UTSM-2010-10 Outdoor Unit

Part 3

Outdoor Units

1. Dimensions ...................................................................... 68

2. Service Space .................................................................. 69

3. Piping Diagrams.............................................................. 70

4. Wiring Diagrams ............................................................. 71

5. Electric Characteristics .................................................. 73

6. Operation Limits ............................................................. 74

7. Sound Levels ................................................................... 75

8. Troubleshooting .............................................................. 76

Outdoor Unit 67

Dimensions MLCAC-UTSM-2010-10

1. Dimensions

Unit: mm

MODEL A B C D E F H

MOUB-36HDN1-Q 940 600 376 400 340 360 1245

MOUB-36HDN1-R 990 624 366 396 340 354 966

MOU-48HDN1 940 600 376 400 340 360 1245

MOUB-48HDN1-R 940 600 376 400 340 360 1245

68 Outdoor Units

MLCAC-UTSM-2010-10 Service Space

2. Service Space

Outdoor Units 69

Piping Diagrams MLCAC-UTSM-2010-10

3. Piping Diagrams

MOUB-36HDN1-Q、MOU-48HDN1、MOUB-36HDN1-R、MOUB-48HDN1-R

High pressure switch

T5

Discharge temp. sensor

Oil separator

Filter

Filter

Compressor

Low pressure

switch

Oil return
Capillary

Condenser

Ambient temp. sensor

4-way valve

Low pressure liquid

accumulator

Condenser temp. sensor

T3

Filter

T4

Outdoor unit

Electronic
expansion valve

Capillary

Filter

Evaporator

Evaporator temp. sensor

Room temp. sensor

Indoor unit

T2

T1

70 Outdoor Units

MLCAC-UTSM-2010-10 Wiring Diagrams

4. Wiring Diagrams

MOUB-36HDN1-Q MOU-48HDN1

MOUB-36HDN1-R

Outdoor Units 71

Wiring Diagrams MLCAC-UTSM-2010-10

MOUB-48HDN1-R

72 Outdoor Units

MLCAC-UTSM-2010-10 Electric Characteristics

5. Electric Characteristics

Model

MOUB-36HDN1-Q 50 220-240 198 254 40

MOUB-36HDN1-R 50 380-415 342 440 40

MOU-48HDN1 50 220-240 198 254 40

MOUB-48HDN1-R 50 380-415 342 440 40

Remark:

MFA: Max. Fuse Amps. (A)

Hz Voltage Min. Max. MFA

Outdoor Unit Power Supply

Outdoor Units 73

Operation Limits MLCAC-UTSM-2010-10

6. Operation Limits

Heating

25

24

20

15

10

5

0

-5

Outdoor temperature(℃ WB)

-10

-15

STD

15

10

17

20

Indoor temperature(℃ DB)

25

30

35

74 Outdoor Units

MLCAC-UTSM-2010-10 Sound Levels

7. Sound Levels

Model

MOUB-36HDN1-Q 57/52

MOUB-36HDN1-R 55/50

MOU-48HDN1 59/54

MOUB-48HDN1-R 59/54

Noise level dB(A)

H/L

Outdoor Units 75

Troubleshooting MLCAC-UTSM-2010-10

8. Troubleshooting

8.1 Indoor unit malfunction

8.1.1 Display board
Ceiling & Floor Normal 4-way cassette

Duct

76 Outdoor Units

MLCAC-UTSM-2010-10 Troubleshooting

8.1.2 Troubleshooting

For Normal 4-way cassette

For ceiling & floor

Outdoor Units 77

Troubleshooting MLCAC-UTSM-2010-10

For Duct type

78 Outdoor Units

MLCAC-UTSM-2010-10 Troubleshooting

1. Operation lamp flashes

Operation lamp flashes at 5Hz

Judge 1: Indoor temp. sensor is abnormal

Check whether the resistance of the evaporator temp. sensor is

correct according to Annex 1

No

Replace evaporator temp. sensor

Yes

Judge 2: Room temp. sensor is abnormal

Check whether the resistance of the room temp.

sensor is correct according to Annex 1

No

Replace room temp. sensor

Yes

Replace indoor PCB

Outdoor Units 79

Troubleshooting MLCAC-UTSM-2010-10

2. Timer lamp flashes

Timer lamp flashes at 5Hz

Judge: Indoor/outdoor unit communication is abnormal

Refer to the outdoor unit LED display E2 malfunction in the following part

3. Alarm lamp slow-flash

Indoor alarm lamps flash at 1Hz

Condenser temp. sensor or outdoor unit is malfunction

Judge 1: Condenser temp. sensor is abnormal

Check whether the resistance of the condenser temp. sensor is

correct according to Annex 1

No

Replace condenser temp. sensor

Yes

Judge 2: Outdoor unit is abnormal

Refer to the outdoor unit LED display E4、P1、P2 malfunction in the

following part

80 Outdoor Units

MLCAC-UTSM-2010-10 Troubleshooting

3. Alarm lamp quick-flash

Alarm lamp flashes at 5Hz

Judge: Water level switch is abnormal.

Check whether the water pump can work normally

No

Replace water pump

Yes

Select the cooling mode to make water pump work for a few minutes, then check

whether the system can run normally

Yes

Trouble is solved

Check whether the water drain pipe is blocked

No

Yes

Solve to make the water can flow

fluently

No

Replace indoor PCB

4. Defrost lamp flashes

Defrost lamp flashes

Judge: Mode conflicts malfunction

Turn the indoor unit to heating mode or turn off the unit

Outdoor Units 81

Troubleshooting MLCAC-UTSM-2010-10

9.2 Outdoor unit malfunction

Display Malfunction or Protection

E0 EEPROM malfunction

E2 Communication malfunction between indoor IC and outdoor IC

E3 Communication malfunction in outdoor IC and DSP

E4 Malfunction of outdoor temperature sensor

E5 Voltage protection of compressor

E6 PFC module protection (Only for 30K, 36K & 48K with 1 phase)

P0 Top temperature protection of compressor

P1 High pressure protection

P2 Low pressure protection

P3 Current protection of compressor

P4 Discharge temperature protection of compressor

P5 High temperature protection of condenser

P6 Module protection

1. E0 malfunction

Judge: Check whether the EEPROM is inserted well

E0 display

EEPROM malfunction

Yes

Replace outdoor main board

No

Insert the EEPROM well

82 Outdoor Units

MLCAC-UTSM-2010-10 Troubleshooting

2. E2 malfunction

E2 display

Communication malfunction between indoor IC and outdoor IC

Judge 1: Check whether the indoor unit power is on

No

Turn on the indoor unit power

Yes

Judge 2: Check whether the signal wiring is shield cable or whether

the shield cable is earthed

No

Adopt the shield cable/ let shield cable earthed

Judge 3: Check whether the signal wiring between the indoor and

outdoor units is wrong polarity?

Yes

No

Yes

Connect the signal wiring correctly

Judge 4: Check whether the signal wiring between the indoor and

outdoor units is broken?

Yes

Replace the broken wiring

No

Indoor or outdoor main board is broken. Replace the main

board until the malfunction disappears.

Outdoor Units 83

Troubleshooting MLCAC-UTSM-2010-10

3. E3 malfunction (For 18K & 24K & 30K)

E3 display

Communication malfunction in outdoor IC and DSP

Check whether the indicator lights LED1 on the main board is flashing

Yes

Replace the outdoor main board

No

Check whether the connecting wiring between the IPM module and the CN4

on the main board is broken off

Yes

Insert the connecting wiring well over

again

No

Disconnect the connecting wiring between the IPM module and the CN4 on the

main board, use the multimeter to measure the voltage between the IPM module

CN1 port’s 3 and 4 pillar, check whether it is 5V, (the third pillar on the main board

labels +5V)

Yes

Replace outdoor main board

No

Check whether the connecting wiring between the IPM module positive

pole and the CN12 on the power board is broken off

Yes

Insert the connecting wiring well over again

No

Check whether the connecting wiring between the IPM module negative

pole and the CN13 on the power board is broken off

Yes

Insert the connecting wiring well over again

No

Use the multimeter to measure whether the voltage between the CN12 and

the CN13 on the power board is between +（277V~345）V

No

Replace the power board

84 Outdoor Units

Yes

Replace the IPM module

MLCAC-UTSM-2010-10 Troubleshooting

4. E3 malfunction (For 36K & 48K & 60K)

E3 display

Communication malfunction in outdoor IC and DSP

Check whether the indicator lights LED1 or LED2 on the main control

board are flashing

Yes

Replace PCB

Install the IC-U3 chip of the PCB over again, check whether the system

can run normally

No

Yes

Trouble is solved

No

Yes

Check whether the output of the transformer to CN4 socket is well

Replace PCB

No

Replace the transformer

Outdoor Units 85

Troubleshooting MLCAC-UTSM-2010-10

5. E4 malfunction

E4 display

Judge 1: Outdoor condenser temp. sensor (T3) is malfunction

Check whether the wiring of the condenser temp. sensor is broken off

Yes

Connect the wiring well

No

Check whether the resistance of condenser temp. sensor is wrong

refer to the Annex 1

Yes

Replace condenser temp. sensor

No

Judge 2: Outdoor ambient temp. sensor (T4) is malfunction

Check whether the wiring of the outdoor ambient temperature sensor (T4) is

broken off

Yes

Connect the wiring well

No

Check whether the resistance of outdoor ambient temperature sensor

(T4) is wrong refer to the Annex 1

Yes

Replace outdoor ambient temperature sensor

(T4)

No

Replace PCB

86 Outdoor Units

MLCAC-UTSM-2010-10 Troubleshooting

6. E5 malfunction

E5 display

Voltage protection of compressor

Check the voltage of outdoor unit power supply, whether the voltage

between L(1) and N is about 172-265V

No

Check the power supply

Yes

Replace the power board, then check whether the system can run normally

Yes

Trouble is solved

No

Replace outdoor main board

7. E6 malfunction (Only for 30K, 36K & 48K with 1 phase)

E6 display

PFC module protection

Check whether the connecting line between main

board and the PFC module is connected tightly

No

Connect it tightly, check normal or not

Yes

No

Check whether the voltage between P

and N of IPM module is 380-390V

Yes

Replace the outdoor main board

No

Replace the PFC module

Outdoor Units 87

Troubleshooting MLCAC-UTSM-2010-10

8. P1 malfunction

P1 display

High pressure protection

Judge 1: Whether the wiring between the high pressure switch and main

control board is connected well or correctly

No

Connect it well

Yes

Judge 2: Whether the high pressure switch is broken

Method: Short connect the high pressure switch socket, check

whether the system can run normally

Yes

Replace high pressure switch

No

Check whether the refrigerant system is ok

Judge 3: Check whether the outdoor ambient temperature is too high

Yes

Stop the unit

No

Yes

Judge 4: Check whether the outdoor unit is bad ventilation

Make the outdoor unit ventilate well

Judge 5: Check whether the heat exchanger is dirty

No

Yes

Clean the heat exchanger

No

Yes

Judge 6: Check whether the refrigerant pipe is blocked

No

Replace outdoor main board

88 Outdoor Units

Let the refrigerant out, then use the high pressure

nitrogen or refrigerant to blow pipe, vacuumize and

charge the refrigerant again

MLCAC-UTSM-2010-10 Troubleshooting

9. P2 malfunction

P2 display

Low pressure protection

Judge 1: The wiring between the low pressure switch and main control

board is connected well or correctly

No

Connect it well

Yes

Judge 2: Whether the low pressure switch is broken

Method: Short connect the low pressure switch socket, check

whether the system can run normally

Yes

Replace low pressure switch

No

Check whether the refrigerant system is ok

Judge 3: Check whether the outdoor ambient temperature is too low

Yes

Stop the unit

No

Method: Connect the pressure gauge to the gauge joint of the system,

check whether the pressure is lower than 0.14MPa

Judge 4: The refrigerant of the system is leakage

Yes

Leak hunting: Charge nitrogen or refrigerant to
the system, if the leakage is serious, there will
be distinct gas leakage “cici” sound; if the
leakage is slight, use the suds (mixture of water
and abluent is also ok if it can make bubble) or
electronic leak detector.

No

Yes

Judge 5: The refrigerant pipe is blocked

No

Replace outdoor main board

Outdoor Units 89

Let the refrigerant out, then use the high pressure

nitrogen or refrigerant to blow pipe, vacuumize and

charge the refrigerant again

Troubleshooting MLCAC-UTSM-2010-10

10. P3 malfunction

P3 display

Current protection of compressor

Judge 1: Check whether the input current of the power supply wire is more

than 20A (For 36K & 48K with 1 phase, it is 30A)

Yes

Check whether the refrigerant system is ok

Judge 2: Check whether the outdoor ambient temperature is too high

Yes

Stop the unit

Judge 3: Check whether the outdoor unit is bad ventilation

No

Yes

Make the outdoor unit ventilate well

Judge 4: Check whether the heat exchanger is dirty

No

Yes

Clean the heat exchanger

Judge 5: The refrigerant pipe is blocked

No

No

Yes

Let the refrigerant out, then use the high pressure

nitrogen or refrigerant to blow pipe, vacuumize and

charge the refrigerant again

Replace outdoor main board

90 Outdoor Units

MLCAC-UTSM-2010-10 Troubleshooting

11. P4 malfunction

When compressor discharge temperature is higher than 115°C, the unit will stop, and unit runs again when
compressor discharge temperature is lower than 90°C.

P4 display

Discharge temperature protection of compressor

Check whether the compressor discharge temp. is more than 115°C ?

Yes

No

Check whether the wiring connection is right

between compressor discharge temp. sensor and

PCB according to wiring diagrams

No

Correct the wiring connection

Yes

Judge: The discharge temp. sensor is broken

Check whether the refrigerant is leak

Yes

Stop leaking and add refrigerant

Method: Check whether the resistance of compressor discharge

temp. sensor is right refer to the Annex 2

No

Replace the compressor

discharge temp. sensor

Yes

Replace outdoor main board

Outdoor Units 91

Troubleshooting MLCAC-UTSM-2010-10

12. P5 malfunction

When condenser high temp. is more than 65°C, the unit will stop, and unit runs again when outdoor pipe
temp. less than 52°C.

P5 display

High temperature protection of condenser

Check whether the condenser temperature is more than 65°C

Yes

No

Check whether the resistance of condenser temp.

sensor is correct refer to the Annex 1

No

Replace the temperature sensor

Yes

Replace outdoor main board

Stop the unit

Yes

Judge1: The outdoor temp. is too high

Clean the heat exchanger

Yes

Judge 2: Check whether the heat exchanger is dirty

No

Let the refrigerant out, then use the high pressure

nitrogen or refrigerant to blow pipe, vacuumize and

charge the refrigerant again

Yes

Judge 3: The refrigerant pipe is blocked

No

No

Replace outdoor main board

92 Outdoor Units

MLCAC-UTSM-2010-10 Troubleshooting

13. P6 malfunction (For single phase units)

P6 display

Module protection

Check whether the voltage range of P-N on

IPM module is normal? DC277-356V for

18K/24K/30KBtu/h; DC277-410V for

36K/48KBtu/h

No

Check whether the input power supply

is correct? 220-240V, 1N, 50Hz

No

Regulate it to correct,

then check whether the

system can work

normally?

Yes

Yes

Check whether the connecting line

between main board and the IPM

module is connected tightly

No

Connect it tightly,

check ok or not?

Check whether the power

supply line is connected

correctly and tightly

No

Connect it correctly and
tightly, check ok or not?

Yes

No

Yes

Check whether the connecting

line of the compressor is

connected correctly or tightly

Yes

Replace the IPM module, check

whether the system can work

normally?

No

Yes

Connect it well,

check ok or not?

No

Check whether the lines in

E-part box are connected tightly

Yes

Check whether the single-phase bridge is

normal? Use the multimeter to measure the

resistance between each two terminals, check

whether there is the condition that value of

resistance is 0

No

Connect it tightly,

check ok or not?

Yes

single-phase bridge

Replace the main board, check

whether the system can work

No

normally?

No

Trouble is solved

Yes

Trouble is solved

No

Check whether the connecting line

of every reactor is normal? If the

line is broken, the resistance of the

two ports is ∞

No

No

No

No

Replace the

Replace the

connecting line

Replace the compressor, check

whether the system can work

normally?

Outdoor Units 93

Yes

Trouble is solved

Yes

Check whether the fuse on

the power board is normal?

Yes

Replace the power board

No

Replace with

the same model

fuse

Troubleshooting MLCAC-UTSM-2010-10

14. P6 malfunction (For three phases units)

P6 display

Module protection

Check whether the voltage range of P-N on

IPM module is normal? DC 350-650V

No

Check whether the input power supply

is correct? 380-415V, 3N, 50Hz

No

Regulate it to correct,

then check whether the

system can work

normally?

Yes

Yes

Check whether the connecting line

between main board and the IPM

module is connected tightly

Connect it tightly,

check ok or not?

Check whether the power

supply line is connected

correctly and tightly

No

Connect it correctly and
tightly, check ok or not?

Yes

No

Yes

Check whether the connecting

line of the compressor is

connected tightly

Connect it tightly,

check ok or not?

Check whether the lines in

E-part box are connected tightly

Yes

No

Connect it tightly,

check ok or not?

Yes

No

Trouble is solved

Check whether the three phase bridge

is normal?

Yes

No

Replace the three phase

Yes

Replace the IPM module, check

whether the system can work

normally?

No

Check whether the 3300µF/400V

electrolytic capacitor is normal?

No

Replace this electrolytic

capacitor

Replace the main board, check whether the

system can work normally?

Yes

Trouble is solved

No

Replace the compressor , check whether

the system can work normally?

Yes

Trouble is solved

No

No

No

bridge

94 Outdoor Units

MLCAC-UTSM-2010-10 Troubleshooting

Appendix Indoor Temp. and Pipe Temp. Sensor Resistance Value Table (℃--K)

℃

-20 115.266 20 12.6431 60 2.35774 100 0.62973

-19 108.146 21 12.0561 61 2.27249 101 0.61148

-18 101.517 22 11.5000 62 2.19073 102 0.59386

-17 96.3423 23 10.9731 63 2.11241 103 0.57683

-16 89.5865 24 10.4736 64 2.03732 104 0.56038

-15 84.2190 25 10.000 65 1.96532 105 0.54448

-14 79.3110 26 9.55074 66 1.89627 106 0.52912

-13 74.5360 27 9.12445 67 1.83003 107 0.51426

-12 70.1698 28 8.71983 68 1.76647 108 0.49989

-11 66.0898 29 8.33566 69 1.70547 109 0.48600

-10 62.2756 30 7.97078 70 1.64691 110 0.47256

-9 58.7079 31 7.62411 71 1.59068 111 0.45957

-8 56.3694 32 7.29464 72 1.53668 112 0.44699

-7 52.2438 33 6.98142 73 1.48481 113 0.43482

-6 49.3161 34 6.68355 74 1.43498 114 0.42304

-5 46.5725 35 6.40021 75 1.38703 115 0.41164

-4 44.0000 36 6.13059 76 1.34105 116 0.40060

-3 41.5878 37 5.87359 77 1.29078 117 0.38991

-2 39.8239 38 5.62961 78 1.25423 118 0.37956

-1 37.1988 39 5.39689 79 1.21330 119 0.36954

0 35.2024 40 5.17519 80 1.17393 120 0.35982

1 33.3269 41 4.96392 81 1.13604 121 0.35042

2 31.5635 42 4.76253 82 1.09958 122 0.3413

3 29.9058 43 4.57050 83 1.06448 123 0.33246

4 28.3459 44 4.38736 84 1.03069 124 0.32390

5 26.8778 45 4.21263 85 0.99815 125 0.31559

6 25.4954 46 4.04589 86 0.96681 126 0.30754

7 24.1932 47 3.88673 87 0.93662 127 0.29974

8 22.5662 48 3.73476 88 0.90753 128 0.29216

9 21.8094 49 3.58962 89 0.87950 129 0.28482

10 20.7184 50 3.45097 90 0.85248 130 0.27770

11 19.6891 51 3.31847 91 0.82643 131 0.27078

12 18.7177 52 3.19183 92 0.80132 132 0.26408

13 17.8005 53 3.07075 93 0.77709 133 0.25757

14 16.9341 54 2.95896 94 0.75373 134 0.25125

15 16.1156 55 2.84421 95 0.73119 135 0.24512

16 15.3418 56 2.73823 96 0.70944 136 0.23916

17 14.6181 57 2.63682 97 0.68844 137 0.23338

18 13.9180 58 2.53973 98 0.66818 138 0.22776

19 13.2631 59 2.44677 99 0.64862 139 0.22231

K Ohm

℃

K Ohm

℃

K Ohm

℃

K Ohm

Outdoor Units 95

Installation MLCAC-UTSM-2010-10

Part 4

Installation

1.Precaution on Installation ................................................... 97

2.Vacuum Dry and Leakage Checking ................................. 98

3.Additional Refrigerant Charge .........................................100

4.Water Drainage ................................................................101

5.Insulation Work ................................................................104

6.Wiring ...............................................................................105

7.Test Operation ..................................................................106

96 Installation

MLCAC-UTSM-2010-10 Precaution on Installation

1. Precaution on Installation

1). Measure the necessary length of the connecting pipe, and make it by the following way.

a. Connect the indoor unit at first, then the outdoor unit.

Bend the tubing in proper way. Do not harm them.

Specially Notice the pipe length/height/dimension of each capacity.

Maximum pipe length

Model Max. Length Max. Elevation

12,000Btu/h 10m 5m

18,000Btu/h ~24,000Btu/h 25m 12m

30,000Btu/h 25m 15m

36,000Btu/h 30m 20m

48,000Btu/h~60,000Btu/h 50m 25m

Piping sizes

Model Liquid(mm) Gas(mm)

12,000Btu/h~18,000Btu/h 6.4 12.7

24,000Btu/h~60,000Btu/h

CAUTIONS

 Daub the surfaces of the flare pipe and the joint nuts with frozen oil, and wrench it for 3~4 rounds
 With hands before fasten the flare nuts.
 Be sure to use two wrenches simultaneously when you connect or disconnect the pipes.

Pipe gauge Tightening torque

Φ6.4

Φ9.5

Φ12.7

Φ15.9

Φ19.1

b. The stop value of the outdoor unit should be closed absolutely (as original state). Every time you connect it, first loosen the nuts at the part

of stop value, then connect the flare pipe immediately (in 5 minutes). If the nuts have been loosened for a long time, dusts and other
impurities may enter the pipe system and may cause malfunction later. So please expel the air out of the pipe with refrigerant before
connection.

c. Expel the air after connecting the refrigerant pipe with the indoor unit and the outdoor unit. Then fasten the nuts at the repair-points.

2) Locate The Pipe

a. Drill a hole in the wall (suitable just for the size of the wall conduit), then set on the fittings such as the wall conduit and its cover.

b. Bind the connecting pipe and the cables together tightly with binding tapes. Do not let air in, which will cause water leakage by

condensation.

c. Pass the bound connecting pipe through the wall conduit from outside. Be careful of the pipe allocation to do no damage to the tubing.

3) Connect the pipes.

4) Then, open the stem of stop values of the outdoor unit to make the refrigerant pipe connecting the indoor unit with the outdoor unit in
fluent flow.

5) Be sure of no leakage by checking it with leak detector or soap water.

6) Cover the joint of the connecting pipe to the indoor unit with the soundproof / insulating sheath (fittings), and bind it well with the tapes to
prevent leakage.

14.2～17.2N.m

(144～176 kgf.cm)

32.7～39.9N.m

(333～407kgf.cm)

49.5～60.3N.m

(504～616kgf.cm)

61.8～75.4N.m

(630～770 kgf.cm)

97.2～118.6N.m

(990～1210kgf.cm)

9.5 15.9

Flare dimension A

Min (mm) Max

Flare shape

8.3 8.7

12.0 12.4

15.4 15.8

18.6 19.1

22.9 23.3

Installation 97

Vacuum Dry and Leakage Checking MLCAC-UTSM-2010-10

2. Vacuum Dry and Leakage Checking

1) Vacuum Dry: use vacuum pump to change the moisture (liquid) into steam (gas) in the pipe and discharge it out of the pipe to make the
pipe dry. Under one atmospheric pressure, the boiling point of water(steam temperature) is 100. Use vacuum pump to make the
pressure in the pipe near vacuum state, the boiling point of water falls relatively. When it falls under outdoor temperature, the moisture in
the pipe will be vaporized.

Necessary
vacuum
degree

2) Vacuum dry procedure

There are two methods of vacuum dry due to different construction environment: common vacuum dry, special vacuum dry.

. Common vacuum dry procedure

 Vacuum dry (for the first time)---connect the all-purpose detector to the inlet of liquid pipe and gas pipe, and run the vacuum pump more

than two hours (the vacuum pump should be below -755mmHg)

 If the pump can’t achieve below -755mmHg after pumping 2 hours, moisture or leakage point will still exist in the pipe. At this time, it

should be pumped 1 hour more.

 If the pump can’t achieve -755mmHg after pumping 3 hours, please check if there are some leakage points.
 Vacuum placement test: place 1 hour when it achieves -755mmHg, pass if the vacuum watch shows no rising. If it rises, it shows there’s

moisture or leakage point.

 Vacuuming from liquid pipe and gas pipe at the same time.
 Sketch map of common vacuum dry procedure.

98 Installation

MLCAC-UTSM-2010-10 Vacuum Dry and Leakage Checking

. Special vacuum dry procedure

 This vacuum dry method is used in the following conditions:

 There’s moisture when flushing the refrigerant pipe.
 Rainwater may enter into the pipe.

 Vacuum dry for the first time ······ 2h pumping

. Vacuum destroy for the second time ······ Fill nitrogen to 0.5Kgf/cm2
Because nitrogen is for drying gas, it has vacuum drying effect during vacuum destroy. But if the moisture is
too much, this method can’t dry thoroughly. So, please pay more attention to prevent water entering and
forming condensation water.

. Vacuum dry for the second time······1h pumping

Determinant: Pass if achieving below -755mmHg. If -755mmHg can’t be achieved in 2h, repeat procedure 
and .

. Vacuum placing test ······ 1h

. Sketch map of special vacuum dry procedure

Installation 99

Additional Refrigerant Charge MLCAC-UTSM-2010-10

3. Additional Refrigerant Charge

Caution

a) Refrigerant cannot be charged until field wiring has been completed.

b) Refrigerant may only be charged after performing the leak test and the vacuum pumping.
c) When charging a system, care shall be taken that its maximum permissible charge is never exceeded,

in view of the danger of liquid hammer.

d) Charging with an unsuitable substance may cause explosions and accidents, so always ensure that the

appropriate refrigerant is charged.
e) Refrigerant containers shall be opened slowly.
f) Always use protective gloves and protect your eyes when charging refrigerant.
The outdoor unit is factory charged with refrigerant. Calculate the added refrigerant according to the
diameter and the length of the liquid side pipe of the outdoor unit/indoor unit.

R(g) D(mm)

L(m)
Less than 5m (One-way) — — —
Added Refrigerant When

Over 5m(One-way)

Remark:

R (g): Additional refrigerant to be charged
L (m): The length of the refrigerant pipe (one-way)
D (mm): Liquid side piping diameter

φ6.4 Φ9.5 Φ12.7

11g/m×(L-5) 30g/m×(L-5) 60g/m×(L-5)

100 Installation

MLCAC-UTSM-2010-10 Water Drainage

4. Water Drainage

4.1 Gradient and Supporting

1). Keep the drainpipe sloping downwards at a gradient of at least 1/50. Keep the drainpipe as short as possible and eliminate the air bubble.

2). The horizontal drainpipe should be short. When the pipe is too long, a prop stand must be installed to keep the gradient of 1/50 and

prevent bending. Refer to the following table for the specification of the prop stand.

Diameter Distance between the prop stands

Hard PVC pipe 25~40mm 1.5~2m

3). Precautions

 The diameter of drainpipe should meet the drainage requirement at least.

 the drainpipe should be heat-insulated to prevent atomization.

 Drainpipe should be installed before installing indoor unit. After powering on, there is some water in water-receiver plate. Please check if the

drain pump can operate correctly.

 All connection should be firm.

 Wipe color on PVC pipe to note connection.

 Climbing, horizontal and bending conditions are prohibited.

 The dimension of drainpipe can’t less than the connecting dimension of indoor drainpipe.

 Heat-insulation should be done well to prevent condensation.

 Indoor units with different drainage type can’t share one convergent drainpipe.

4.2 Drainpipe Trap

1). If the pressure at the connection of the drainpipe is negative, it needs to design drainpipe trap.

2). Every indoor unit needs one drainpipe trap.

3). A plug should be designed to do cleaning.

Plug

4.3 Upwards drainage (drain pump)

For Four-way cassette(compact)

5
0

c

m

5
0
c

m

Installation 101

Water Drainage MLCAC-UTSM-2010-10

For Four-way cassette

4.4 Convergent drainage

1). The number of indoor units should be as small as possible to prevent the traverse main pipe overlong.

2). Indoor unit with drain pump and indoor unit without drain pump should be in different drainage system.

3). Selecting the diameter

Number of connecting indoor units → Calculate drainage volume → Select the diameter

Calculate allowed volume =Total cooling capacity of indoor units (HP)×2 (l/ hr)

Allowed volume(lean 1/50) (l/ hr) I.D. (mm) Thick

Hard PVC ∽≤14
Hard PVC
Hard PVC
Hard PVC

175＜

Hard PVC

∽≤88 ￠30

14＜

∽≤334 ￠40

88＜

∽≤334 ￠50

∽ ￠80

334＜

￠25

3.0

3.5

4.0

4.5

6.0

4.5 Drainage test

1). Drainage without drain pump

After finishing drainpipe installation, pour some water into the water receiver plate to check if the water flows smoothly.

2). Drainage with drain pump

 Poke the Water Level Switch, remove the cover, use water pipe to pour 2000ml water into the water receipt plate through the water inlet.

 Turn on the power to Cooling operation. Check the pump’s operation and switch on the Water Level Switch. Check the pump’s sound
and look into the transparent hard pipe in the outlet at the same time to check if the water can discharge normally.

102 Installation

MLCAC-UTSM-2010-10 Water Drainage

 Stop the air conditioner running, turn off the power, and put back the cover.

 Stop the air conditioner. After 3 minutes, check if it has abnormity. If the collocation of drainpipes is illogical, the water will flow back

overfull, which will cause the alarm lamp flashes, even overflow from the water receipt plate.

 Keep on pouring water until it gives an alarm signal for high water level, check if the pump drains water at once. If the water level can’t fall

below the alarmed water level after 3 minutes, the air conditioner will stop. Turn off the power and drain the remained water, and then turn
on the air conditioner.

Note: the drain stuff in the main water receipt plate is for maintenance. Stuff up the drain stuff to prevent water leakage.

Installation 103

Insulation Work MLCAC-UTSM-2010-10

5. Insulation Work

5.1 Insulation material and thickness

1). Insulation material

Insulation material should adopt the material which is able to endure the pipe’s temperature: no less than 70 in the high-pressure side, no
less than 120 in the low-pressure side(For the cooling type machine, no requirements at the low-pressure side.)

Example: Heat pump type----Heat-resistant Polyethylene foam (withstand above 120)

Cooling only type---- Polyethylene foam (withstand above 100)

2). Thickness choice for insulation material

Insulation material thickness is as follows:

Refrigerant pipe

Drainage pipe

Pipe diameter (mm) Adiabatic material thickness

Φ6.4—Φ25.4 10mm

Φ28.6—Φ38.1 15mm

Inner diameterΦ20—Φ32 6mm

5.2 Refrigerant pipe insulation

1). Work Procedure

 Before laying the pipes, the non-jointing parts and non-connection parts should be heat insulated.

 When the gas proof test is eligible, the jointing area, expanding area and the flange area should be heat insulated

2). Insulation for non-jointing parts and non-connection parts

wrong right

Gas pipe and liquid pipe should

not be put together to insulate

Insulate the gas pipe

(cooling only)

Insulate the gas pipe and

liquid pipe

104 Installation

MLCAC-UTSM-2010-10 Insulation Work

For construction convenience, before laying pipes, use insulation material to insulate the pipes to be deal with, at the same time, at two ends
of the pipe, remain some length not to be insulated, in order to be welded and check the leakage after laying the pipes.

3). Insulate for the jointing area, expanding area and the flange area

 Insulate for the jointing area, expanding area and the flange area should be done after checking leakage of the pipes

 Make sure there’s no clearance in the joining part of the accessorial insulation material and local preparative insulation material.

5.3 Drainage pipe insulation

1) The connection part should be insulated, or else water will be condensing at the non-insulation part.

5.4 Note

1) The jointing area, expanding area and the flange area should be heat insulated after passing the pressure test

2) The gas and liquid pipe should be heat insulated individually, the connecting part should be heat insulated individually.

3) Use the attached heat-insulation material to insulate the pipe connections (pipes’ tie-in ,expand nut ) of the indoor unit.

6. Wiring

Please refer to the Wiring Diagram.

Installation 105

Test Operation MLCAC-UTSM-2010-10

7. Test Operation

(1) The test operation must be carried out after the entire installation has been completed.
(2) Please confirm the following points before the test operation.

 The indoor unit and outdoor unit are installed properly.
 Tubing and wiring are correctly completed.
 The refrigerant pipe system is leakage-checked.
 The drainage is unimpeded.
 The ground wiring is connected correctly.
 The length of the tubing and the added stow capacity of the refrigerant have been recorded.
 The power voltage fits the rated voltage of the air conditioner.
 There is no obstacle at the outlet and inlet of the outdoor and indoor units.
 The gas-side and liquid-side stop values are both opened.
 The air conditioner is pre-heated by turning on the power.

(3) According to the user's requirement, install the remote controller when the remote controller's
signal can reach the indoor unit smoothly.
(4) Test operation

Set the air conditioner under the mode of "COOLING" with the remote controller, and check the following
points.

Indoor unit

 Whether the switch on the remote controller works well.
 Whether the buttons on the remote controller works well.
 Whether the air flow louver moves normally.
 Whether the room temperature is adjusted well.
 Whether the indicator lights normally.
 Whether the temporary buttons works well.
 Whether the drainage is normal.
 Whether there is vibration or abnormal noise during operation.

Outdoor unit

 Whether there is vibration or abnormal noise during operation.
 Whether the generated wind, noise, or condensed of by the air conditioner have influenced your

neighborhood.

 Whether any of the refrigerant is leaked.

106 Installation

MLCAC-UTSM-2010-10 Control

Part 5

Control

1. Controller ........................................................................ 108

Control 107

Controller MLCAC-UTSM-2010-10

1. Controller

1.1 R05/BGE

The R05/BGE wireless remote controller is for Four-way cassette type and the Ceiling& floor type.

AUTO

Mo de s et ting

Ad jus t

ON/OFF

Horiz swing

Vert. swing

Reset

COOL

1

1

3

5

7

8

12

HEAT

DRY

FAN

MOD E

M

SWI NG

SW I N G

TE M P

SET

SET

AIR DI RE CTI ON

OK

ECO

FAN
S PEED

CLOCK

TIME ON

TI M E OF F

Fan s peed se tting

2

4

Adjus t

6

Ai r dire cti on setting

9

Tim e settin g

10

Time ON

11

Ti me OFF

14

Lock

Co ol /h eat

13

15

Confirm button

16

E conomi c operation

1.3 General Function for wireless remote controller:

Model and Specification

Model R05/BGE

Rated voltage 3.0V(2pieces of LR03 7＃ batteries)

Min voltage for sending signal of CPU 2.4V

Effective receiving distance 8m~11m

Operation condition -5~60

Visual photo

108 Control

MLCAC-UTSM-2010-10 Controller

Buttons and functions

1. MODE: Once pressing, running mode will be selected in the following sequence:

AUTO COOL DRY

HEAT FAN

NOTE: No heating mode for cool only type unit.

2. FAN SPEED: Fan speed will be selected in following sequence once pressing this button:

AUTO LOW MED HIGH

3. Adjust

4. Adjust

: Decrease the set temp. Keeping pressing will decrease the temp with 1 per 0.5s.

: Increase the set temp. Keeping pressing will increase the temp with 1 per 0.5s.

5. ON/OFF: For turning on or turning off the air conditioner.

6. AIR DIRECTION: Activate swing function of air deflector. Once pressing, air deflector will turn 6°. For

normal operation and better cooling and heating effect, deflector will not turn to the degree which is the state
of deflector when the unit is turned off.( Only available when remote controller is used with corresponding
unit.)

7. HORIZ SWING: Activate or turn off horizontal swing function. (Only available when remote controller is
used with corresponding unit, i.e. Ceiling & floor type)

8. VERT SWING: Activate or turn off vertical swing function.

(Only available when remote controller is used with corresponding unit.)

9. CLOCK: Display the current time. (12:00 is displayed when resetting or electrifying for the first time.)

Press CLOCK for 5s, icon indicating hour will flash with 0.5s. Press it again; icon indicating minute will flash
with 0.5s.

and are used to adjust the figure. Setting or modification is effective only by pressing OK

button to make confirmation.

10. TIME ON: For time ON setting. Once pressing this button, the time will increase by 0.5 hour. When the set
time exceeds 10 hours, pressing the button will increase the time by 1 hour. Adjusting the figure to 0.00 will
cancel time ON setting.

11. TIME OFF: For time OFF setting. Once pressing this button, the time will increase by 0.5 hour. When the
set time exceeds 10 hours, pressing the button will increase the time by 1 hour.

Adjust the figure to 0.00 will cancel time ON setting.

12. RESET (inner located): Press this button with a needle of 1mm to cancel the current setting and reset
remote controller.

13. LOCK (inner located): Press this button with a needle of 1mm to lock or unlock the current setting.

14. OK: Used to confirm the time setting and modification.

15. COOL/HEAT (inner located): Press this button with a needle of 1mm to shift mode between COOL only

and COOL&HEAT. During setting, background light will be lightened. Factory default mode is COOL
&HEAT.

16. ECO: Activate or turn off economic operation mode. It is suggested to turn on this function when sleeping.
(Only available when remote controller is used with corresponding unit.)

Control 109

Controller MLCAC-UTSM-2010-10

1.2 KJR-10B

NAME AND FUNCTION OF LCD ON THE WIRE CONTROLLER

1 Mode select button (MODE):

Press MODE button to select “COOL”, “DRY” , "HEAT", or "FAN ONLY" mode.(HEAT is invalid for

COOL ONLY wire controller.)

AUTO→ COOLING →DEHUMIDIFY →HEATING→ FAN

2 Fan speed button (FAN SPEED)

Press FAN SPEED to select fan speed from "AUTO", "LOW"," MED" , and "HIGH”. NOTE: some air

conditioners have no MED fan speed, and then the MED is regarded as HIGH.

3 Economical operation displays:

110 Control

MLCAC-UTSM-2010-10 Controller

Press ECONOMICAL to display economical operation, if press ECONOMICAL again then the display

disappears

4 Lock display

Press LOCK to display the icon of LOCK. Press the button again then the icon of LOCK disappears. In

the mode of LOCK, all the buttons are invalid except for LOCK button.

5 CLOCK display.

Usually display the clock set currently. Press the button CLOCK for 4 seconds, the HOUR part will flash,

press button ▲ and ▼ to adjust HOUR. Press the button CLOCK again, the minute part flash, press

button▲ or▼ to adjust MINUTE. After clock set or clock operation, it must press CONFIRM to

complete the set.

6 TIMER ON/OFF display:

Display ON at the state of TIMER ON adjustment or after only set the TIMER ON; Display OFF at the

state of TIMER OFF adjustment or after only set the TIMER OFF; Display ON/OFF if simultaneously set

the mode of TIMER ON and TIMER OFF.

7 Temperature display area:

Usually display the set temperature. Press the buttons of and to set temperature, at the mode of FAN,

there is no figure display in the area.

NAME AND FUNCTIONS OF BUTTONS ON WIRE CONTROLLER

1 mode selection button:

It is used to select mode, push the button one time, then the operation modes will change

In turn as follows:

AUTO→ COOLING →DEHUMIDIFY →HEATING→ FAN

Remark: no heating mode if wire controller is set as the cool only.

2 Timer on button:

Control 111

Controller MLCAC-UTSM-2010-10

Push the button to set TIMER ON, each time you push the button the time moves forward by o.5 hours.

When the set time is over 10 hours, each time you push the button the time moves forward by 1 hour. If

want to cancel the TIMER ON, then adjust the time of TIMER ON as 0.0

3 Timer off button:

Push the button to set TIMER OFF, each time you push the button the time moves forward by o.5 hours.

When the set time is over 10 hours, each time you push the button the time moves forward by 1 hour. If

want to cancel the TIMER OFF, then adjust the time of TIMER OFF as 0.0

4 CLOCK button:

Normally display the clock set currently (display 12:00 for the first electrifying or resetting). When push

the button for 4 seconds, the hour part on the clock display flashes every 0.5 seconds, then push button

and to adjust hour; push the button CLOCK again, the minute part flashes every 0.5 seconds, then push

and button to adjust minute. When set clock or alter clock setting, must push the confirm button to

complete the setting

112 Control

MLCAC-UTSM-2010-10 Controller

Installation

Installation Notice:

When the air conditioner needs the constant frequency wire Controller, be sure adding a Wire Joint with 5

terminal named A, B, C, D, E in indoor unit, and fixing a infrared emitter whose anode and cathode

connecting with A and B near the receiver in the Indoor Unit Switch Board, then connecting the terminal +5v,

GND, Run in the Switch Board to C,D,E respectively.

NOTE

Never turn screws too tightly, or else the cover would be dented or the Liquid Crystal breaks.

Please leave enough long cable for maintenance of the Wire Controller Board.

Control 11 3