MDV MDSF-12HRN1, MDSF-09HRN1, MDOF-07HN1, MDOF-09HN1, MDSF-18HRN1 Service Manual

FAIRWIND ON-OFF SERIES

Service Manual 2014

CONTENTS

1. Precaution .................................................................................................................................................... 3



1.1 Safety Precaution ........................................................................................................................ 3

1.2 Warning ....................................................................................................................................... 3

2. Function ........................................................................................................................................................ 7



3. Dimension .................................................................................................................................................... 9



3.1 Indoor Unit ................................................................................................................................... 9

3.2 Outdoor Unit .............................................................................................................................. 14

4. Refrigerant Cycle Diagram ....................................................................................................................... 16



5. Wiring Diagram .......................................................................................................................................... 18



5.1 Indoor Unit ................................................................................................................................. 18

5.2 Outdoor Unit .............................................................................................................................. 28

6 Installation Details ...................................................................................................................................... 40



6.1 Wrench torque sheet for installation .......................................................................................... 40

6.2 Connecting the cables ............................................................................................................... 40

6.3 Pipe length and the elevation .................................................................................................... 41

6.4 Installation for the first time........................................................................................................ 44

6.5 Adding the refrigerant after running the system for many years ................................................ 48

6.6 Re-installation while the indoor unit need to be repaired ........................................................... 49

6.7 Re-installation while the outdoor unit need to be repaired ......................................................... 51

7. Operation Characteristics ......................................................................................................................... 54



8. Electronic function .................................................................................................................................... 55



8.1 Abbreviation .............................................................................................................................. 55

8.2 Display function ......................................................................................................................... 55

8.3 Main Protection ......................................................................................................................... 56

8.4 Operation Modes and Functions ............................................................................................... 57

9. Troubleshooting ......................................................................................................................................... 73



9.1 Indoor Unit Error Display ........................................................................................................... 73

9.2 Diagnosis and Solution .............................................................................................................. 74

1. Precaution

1.1 Safety Precaution

 To prevent injury to the user or other people and property damage, the following

instructions must be followed.

 Incorrect operation due to ignoring instruction will cause harm or damage.
 Before service the unit, be sure to read this service manual at first.

1.2 Warning

 Installation

 Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated

circuit.

There is risk of fire or electric shock.

 For electrical work, contact the dealer, seller, a qualified electrician, or an authorized

service center.

Do not disassemble or repair the product, there is risk of fire or electric shock.

 Always ground the product.

There is risk of fire or electric shock.

 Install the panel and the cover of control box securely.

There is risk of fire of electric shock.

 Always install a dedicated circuit and breaker.

Improper wiring or installation may cause fore or electric shock.

 Use the correctly rated breaker of fuse.

There is risk of fire or electric shock.

 Do not modify or extend the power cable.

There is risk of fire or electric shock.

 Do not install, remove, or reinstall the unit by yourself (customer).

There is risk of fire, electric shock, explosion, or injury.

 Be caution when unpacking and installing the product.

Sharp edges could cause injury, be especially careful of the case edges and the fins on the

condenser and evaporator.

 For installation, always contact the dealer or an authorized service center.
 Do not install the product on a defective installation stand.
 Be sure the installation area does not deteriorate with age.

If the base collapses, the air conditioner could fall with it, causing property damage, product failure,

and personal injury.

 Do not let the air conditioner run for a long time when the humidity is very high and a

door or a window is left open.

 Take care to ensure that power cable could not be pulled out or damaged during

operation.

There is risk of fire or electric shock.

 Do not place anything on the power cable.

There is risk of fire or electric shock.

 Do not plug or unplug the power supply plug during operation.

There is risk of fire or electric shock.

 Do not touch (operation) the product with wet hands.
 Do not place a heater or other appliance near the power cable.

There is risk of fire and electric shock.

 Do not allow water to run into electrical parts.

It may cause fire, failure of the product, or electric shock.

 Do not store or use flammable gas or combustible near the product.

There is risk of fire or failure of product.

 Do not use the product in a tightly closed space for a long time.

Oxygen deficiency could occur.

 When flammable gas leaks, turn off the gas and open a window for ventilation before

turn the product on.

 If strange sounds or smoke comes from product, turn the breaker off or disconnect the

power supply cable.

There is risk of electric shock or fire.

 Stop operation and close the window in storm or hurricane. If possible, remove the

product from the window before the hurricane arrives.

There is risk of property damage, failure of product, or electric shock.

 Do not open the inlet grill of the product during operation. (Do not touch the electrostatic

filter, if the unit is so equipped.)

There is risk of physical injury, electric shock, or product failure.

 When the product is soaked, contact an authorized service center.

There is risk of fire or electric shock.

 Be caution that water could not enter the product.

There is risk of fire, electric shock, or product damage.

 Ventilate the product from time to time when operating it together with a stove etc.

There is risk of fire or electric shock.

 Turn the main power off when cleaning or maintaining the product.

There is risk of electric shock.

 When the product is not be used for a long time, disconnect the power supply plug or

turn off the breaker.

There is risk of product damage or failure, or unintended operation.

 Take care to ensure that nobody could step on or fall onto the outdoor unit.

This could result in personal injury and product damage.

 CAUTION

 Always check for gas (refrigerant) leakage after installation or repair of product.

Low refrigerant levels may cause failure of product.

 Install the drain hose to ensure that water is drained away properly.

A bad connection may cause water leakage.

 Keep level even when installing the product.

It can avoid vibration of water leakage.

 Do not install the product where the noise or hot air from the outdoor unit could damage

the neighborhoods.

It may cause a problem for your neighbors.

 Use two or more people to lift and transport the product.
 Do not install the product where it will be exposed to sea wind (salt spray) directly.

It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins,

could cause product malfunction or inefficient operation.

 Operational

 Do not expose the skin directly to cool air for long time. (Do not sit in the draft).
 Do not use the product for special purposes, such as preserving foods, works of art etc.

It is a consumer air conditioner, not a precision refrigerant system.

There is risk of damage or loss of property.

 Do not block the inlet or outlet of air flow.
 Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.

There is risk of fire, electric shock, or damage to the plastic parts of the product.

 Do not touch the metal parts of the product when removing the air filter. They are very

sharp.

 Do not step on or put anything on the product. (outdoor units)
 Always insert the filter securely. Clean the filter every two weeks or more often if

necessary .

A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or

damage.

 Do not insert hands or other objects through air inlet or outlet while the product is

operated.

 Do not drink the water drained from the product.
 Use a firm stool or ladder when cleaning or maintaining the product.

Be careful and avoid personal injury.

 Replace the all batteries in the remote control with new ones of the same type. Do not

mix old and new batteries or different types of batteries.

There is risk of fire or explosion.

 Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.

They may burn of explode.

 If the liquid from the batteries gets onto your skin or clothes, wash it well with clean

water. Do not use the remote of the batteries have leaked.

MDSF-07HRN1 MDSF-09HRN1
MDSF-07HRN1 MDSF-09HRN1

MDOF-07HN1 MDOF-09HN1

Ph-V-Hz 220-240V~ 50Hz, 1Ph 220-240V~ 50Hz, 1Ph
Capacity Btu/h 7500 9000
Input W 685 820
Rated current A 3,2 3,8
EER W/W 3,21 3,21
Capacity Btu/h 8000 9500
Input W 640 770
Rated current A 3.0 3.6
COP W/W 3,66 3,62

L/h 0.8 1.0

W 1050 1200

A 5.5 6.0

A 16.1 21.7
Model ASN82V1UDZ PA103M1C-4DZDE2
Type ROTARY ROTARY
Brand GMCC GMCC
Capacity Btu/h 6995/7029 8428/8530
Input W 702/735 830/860
Rated current(RLA) A 3.21/3.15 3.85/3.73
Locked rotor Amp(LRA) A 16.1 21.7
Thermal protector ----- B160-135-241E
Thermal protector position EXTERNAL EXTERNAL
Capacitor uF 25 25
Refrigerant oil/oil charge ml ESTEL OIL VG74/300 ESTER OIL VG74 350cc
Model RPG13H RPG13H
Brand Welling Welling
Input W 34 34
Capacitor uF 1.2 1.2
Speed(Hi/Mi/Lo) r/min 1200 / 950 / 800 1250 / 1000 / 800
a.Number of rows 1/2 1/2
b.Tube pitch(a)x row pitch(b) mm 20x11.28 20x11.28
c.Fin spacing mm 1.2/1.3 1.2/1.3
d.Fin type (code) Hydrophilic aluminium Hydrophilic aluminium
e.Tube outside dia.and type mm Φ6,innergroove tube Φ6,innergroove tube
f.Coil length x height x width mm 540x80x11.28+540x180x22.56 540x80x11.28+540x180x22.56
g.Number of circuits 2 2

m3/h 460/360/300 460/360/300

dB(A) 40/33/30 41/33/29
Dimension(W*D*H) mm 715x188x250 715x188x250
Packing (W*D*H) mm 775x260x324 775x260x324
Net/Gross weight Kg 6.5 / 8.5 6.5 / 8.5
Model YDK24-6F(B) YDK24-6T(B)
Brand Welling Welling
Input W 63 70
Capacitor uF 2.5 3.0
Speed r/min 800 / -- / -- 815 / -- / -­a.Number of rows 1 1
b.Tube pitch(a)x row pitch(b) mm 21x13.37 21x13.37
c.Fin spacing mm 1.4 1.4
d.Fin type (code) Hydrophilic aluminium Hydrophilic aluminium
e.Tube outside dia.and type mm Φ7,innergroove tube Φ7,innergroove tube
f.Coil length x height x width mm 600x504x13.37 694x504x13.37
g.Number of circuits 2 1

m3/h 1800 1650

dB(A) 55 55
Dimension(W*D*H) mm 700x240x540 700x240x540
Packing (W*D*H) mm 815x325x580 815x325x580
Net/Gross weight Kg 22 / 24 24.5 / 26.5

g R410A/520g R410A/590g

MPa 4.2/1.5 4.2/1.5
Liquid side/ Gas side mm(inch) Φ6.35/Φ9.52(1/4"/3/8") Φ6.35/Φ9.52(1/4"/3/8")
Max. refrigerant pipe length m 20 20
Max. difference in level m 8 8

Remote Control Remote Control

℃ 17~30 17~30

Indoor(cooling/ heating) ℃ 17～32/0～30 17～32/0～30
Outdoor(cooling/heating) ℃ 18～43/-7～24 18～43/-7～24

Thermostat type
Operation temperature

Room

temperature

Outdoor noise level

Outdoor unit

Refrigerant type
Design pressure

Refrigerant piping

Indoor noise level (Hi/Mi/Lo)

Indoor unit

Outdoor fan
motor

Outdoor coil

Outdoor air flow

Model
Indoor

Indoor air flow (Hi/Mi/Lo)

Outdoor

Power supply

Cooling

Heating

Moisture Removal
Max. input consumption
Max. current
Starting current

Compressor

Indoor fan motor

Indoor coil

3. Function

MDSF-12HRN1 MDSF-18HRN1
MDSF-12HRN1 MDSF-18HRN1

MDOF-12HN1 MDOF-18HN1

Ph-V-Hz 220-240V~ 50Hz, 1Ph 220-240V~ 50Hz, 1Ph
Capacity Btu/h 11500 18000
Input W 1050 1640
Rated current A 4.5 7,6
EER W/W 3.21 3,21
Capacity Btu/h 12000 19000
Input W 975 1540
Rated current A 4.2 7.1
COP W/W 3.61 3,62

L/h 1.1 1.8

W 1800 2200

A 8.0 12.0

A 25.1 31.8
Model PA130G1C-4FTL PA200M2CS-4KU2
Type ROTARY ROTARY
Brand GMCC GMCC
Capacity Btu/h 12505/12556 16581
Input W 885/920 1605
Rated current(RLA) A 4.10/3.90 7.45
Locked rotor Amp(LRA) A 25.1 31.8
Thermal protector --- ---­Thermal protector position INTERNAL INTERNAL
Capacitor uF 35 45
Refrigerant oil/oil charge ml ESTER OIL VG74 · 400 ml ESTER OIL VG74 750cc
Model RPG20E RPG28D
Brand Welling Welling
Input W 45 58
Capacitor uF 1.5 1.5
Speed(Hi/Mi/Lo) r/min 1200 / 1050 / 800 1280/1100/800
a.Number of rows 1/2 2
b.Tube pitch(a)x row pitch(b) mm 21x13.37 21x13.37
c.Fin spacing mm 1.2 1.2
d.Fin type (code) Hydrophilic aluminium Hydrophilic aluminium
e.Tube outside dia.and type mm Φ7,innergroove tube Φ7,innergroove tube
f.Coil length x height x width mm 621x84x13.37+621x210x26.74 750x294x26.74
g.Number of circuits 3 3

m3/h 580/500/400 800/700/500

dB(A) 40/36/30 45/40/33
Dimension(W*D*H) mm 800x188x275 940x205x275
Packing (W*D*H) mm 865x265x350 1015x265x350
Net/Gross weight Kg 8 / 10 10 / 12.5
Model YDK36-6 YDK48-6H(A)
Brand Welling Welling
Input W 70 110
Capacitor uF 2.5 3.0
Speed r/min 900 / -- / -- 890 / -- / -­a.Number of rows 1 2
b.Tube pitch(a)x row pitch(b) mm 22x19.05 21x13.37
c.Fin spacing mm 1.4 1.4
d.Fin type (code) Hydrophilic aluminium Hydrophilic aluminium
e.Tube outside dia.and type mm Φ7.94, innergroove tube Φ7,innergroove tube
f.Coil length x height x width mm 740x506x19.05 660x546x26.74
g.Number of circuits 2 3

m3/h 1800 2300

dB(A) 56 60
Dimension(W*D*H) mm 780x250x540 760x285x590
Packing (W*D*H) mm 910x335x585 887x355x645
Net/Gross weight Kg 28 / 30 36.5 / 39

g R410A/800g R410A/1150g

MPa 4.2/1.5 4.2/1.5
Liquid side/ Gas side mm(inch) Φ6.35/Φ12.7(1/4"/1/2") Φ6.35/Φ12.7(1/4"/1/2")
Max. refrigerant pipe length m 20 25
Max. difference in level m 8 10

Remote Control Remote Control

℃ 17~30 17~30

Indoor(cooling/ heating) ℃ 17～32/0～30 17～32/0～30
Outdoor(cooling/heating) ℃ 18～43/-7～24 18～43/-7～24

Design pressure

Refrigerant piping

Thermostat type
Operation temperature

Room

temperature

Outdoor coil

Outdoor air flow
Outdoor noise level

Outdoor unit

Refrigerant type

Indoor coil

Indoor air flow (Hi/Mi/Lo)
Indoor noise level (Hi/Mi/Lo)

Indoor unit

Outdoor fan
motor

Max. input consumption
Max. current
Starting current

Compressor

Indoor fan motor

Outdoor

Power supply

Cooling

Heating

Moisture Removal

Model
Indoor

MDSF-24HRN1
MDSF-24HRN1

MDOF-24HN1

Ph-V-Hz 220-240V~ 50Hz, 1Ph
Capacity Btu/h 24000
Input W 2330
Rated current A 10,8
EER W/W 3,02
Capacity Btu/h 25000
Input W 2140
Rated current A 9,9
COP W/W 3,42

L/h 2.6

W 4000

A 20.0

A 60
Model PA270G2CS-4MU1
Type ROTARY
Brand GMCC
Capacity Btu/h 23287/23458
Input W 2235/2385
Rated current(RLA) A 10.55/11.15
Locked rotor Amp(LRA) A 60
Thermal protector --­Thermal protector position INTERNAL
Capacitor uF 60
Refrigerant oil/oil charge ml ESTER OIL VG74/850 CC
Model RPG45C
Brand Welling
Input W 77
Capacitor uF 3.0
Speed(Hi/Mi/Lo) r/min 1180 / 1100 / 900
a.Number of rows 2
b.Tube pitch(a)x row pitch(b) mm 21x13.37
c.Fin spacing mm 1.3
d.Fin type (code) Hydrophilic aluminium
e.Tube outside dia.and type mm Φ7,innergroove tube
f.Coil length x height x width mm 780x315x26.74
g.Number of circuits 5

m3/h 1150/1050/900

dB(A) 48/45/41
Dimension(W*D*H) mm 1045x235x315
Packing (W*D*H) mm 1135x395x315
Net/Gross weight Kg 12 / 15
Model YDK53-6C
Brand Welling
Input W 136
Capacitor uF 3.0
Speed r/min 800
a.Number of rows 2
b.Tube pitch(a)x row pitch(b) mm 21x13.37
c.Fin spacing mm 1.4
d.Fin type (code) Hydrophilic aluminium
e.Tube outside dia.and type mm Φ7,innergroove tube
f.Coil length x height x width mm 785x651x26.74
g.Number of circuits 4

m3/h 2700

dB(A) 58
Dimension(W*D*H) mm 845x320x700
Packing (W*D*H) mm 965x395x755
Net/Gross weight Kg 49 / 52

g R410A/1690g

MPa 4.2/1.5
Liquid side/ Gas side mm(inch) Φ9.52/Φ15.9(3/8"/5/8")
Max. refrigerant pipe length m 25
Max. difference in level m 10

Remote Control

℃ 17~30

Indoor(cooling/ heating) ℃ 17～32/0～30
Outdoor(cooling/heating) ℃ 18～43/-7～24

Operation temperature

Room

temperature

Outdoor unit

Refrigerant type
Design pressure

Refrigerant piping

Thermostat type

Indoor unit

Outdoor fan
motor

Outdoor coil

Outdoor air flow
Outdoor noise level

Compressor

Indoor fan motor

Indoor coil

Indoor air flow (Hi/Mi/Lo)
Indoor noise level (Hi/Mi/Lo)

Heating

Moisture Removal
Max. input consumption
Max. current
Starting current

Model
Indoor

Outdoor

Power supply

Cooling

MDSF-28HRN1
MDSF-28HRN1

MDOF-28HN1

Ph-V-Hz 220-240V- 50Hz, 1Ph
Capacity Btu/h 28000
Input W 2920
Rated current A 12.4
EER W/W 2,81
Capacity Btu/h 30000
Input W 2735
Rated current A 11.5
COP W/W 3,21

W 4200

A 22

A 74.5
Model PA331X3CS-4MU1
Type ROTARY
Brand GMCC
Capacity Btu/h 27944/28047
Input W 2725/2880
Rated current(RLA) A 13/13.95
Locked rotor Amp(LRA) A 74.5
Thermal protector ---­Thermal protector position INTERNAL
Capacitor uF 55
Refrigerant oil/oil charge ml ESTEL OIL VG74 .1100
Model RPG45C
Input W 72
Capacitor uF 3.0
Speed(Hi/Mi/Lo) r/min 1200 / 1100 / 900
a.Number of rows 2
b.Tube pitch(a)x row pitch(b) mm 21x13.37
c.Fin spacing mm 1.3
d.Fin type (code) Hydrophilic aluminium
e.Tube outside dia.and type mm Φ7. innergroove tube
f.Coil length x height x width mm 780x336x26.74
g.Number of circuits 4

m3/h

1110/985/770

dB(A)

50/45/40

Dimension(W*D*H) mm

1045x235x315

Packing (W*D*H) mm

1135x395x315
Net/Gross weight Kg 13.1/16.3
Model YDK100-6D
Input W 167.2
Capacitor uF 5.0
Speed r/min 900 / -- / -­a.Number of rows 2
b.Tube pitch(a)x row pitch(b) mm 22x19.05
c.Fin spacing mm 1
d.Fin type (code) Hydrophilic aluminium
e.Tube outside dia.and type mm Φ7.94, inner groove tube
f.Coil length x height x width mm 770x660x38.1
g.Number of circuits 4

dB(A) 63
Dimension(W*D*H) mm 845x320x700
Packing (W*D*H) mm 965x395x755
Net/Gross weight Kg 52.8/56.6

g R410A/2000g

MPa 4.2/1.5
Liquid side/ Gas side mm(inch) Φ9.52/Φ15.9(3/8"/5/8")
Max. refrigerant pipe length m 25
Max. difference in level m 10

Remote Control

℃ 17-30
Indoor(cooling/ heating) ℃ 17-32/0-30
Outdoor(cooling/heating) ℃ 18-43/-7-24

Refrigerant piping

Thermostat type
Operation temperature

Room temperature

Design pressure

Compressor

Indoor fan motor

Indoor coil

Indoor air flow (Hi/Mi/Lo)
Indoor noise level (Hi/Mi/Lo)

Indoor unit

Outdoor fan motor

Outdoor coil

Outdoor noise level

Outdoor unit

Refrigerant type

Starting current

Model
Indoor

Outdoor

Power supply

Cooling

Heating

Max. input consumption
Max. current

MDSF-28HRN1 1045 235 315

MDSF-24HRN1 1045 235 315

MDSF-18HRN1 940 205 275

MDSF-12HRN1 800 188 275

MDSF-09HRN1 715 188 250

MDSF-07HRN1 715 188 250

3. Dimension

3.1 Indoor Unit

W

D

H

Model W D H

MDSF-28HRN1

MDSF-24HRN1

MDSF-18HRN1

MDSF-12HRN1

MSDF-09HRN1

MSDF-07HRN1

Model L(mm) R(mm) H(mm) Dimension of installation hole(mm)

85 88 45

￠65

100 95 45

110 100 45

293 163 45

293 163 45

MDOF-24(28)HN1 845 320 700 908 560 335

MDOF-18HN1 760 285 590 823 530 290

MDOF-12HN1 780 250 540 843 549 276

MDOF-09HN1 700 240 540 757 458 250

MDOF-07HN1 700 240 540 757 458 250

3.2 Outdoor Unit

More than 30cm

More than 60cm

More than 200cm

More than 30cm

More than 60cm
(Service space

︶

F

e

n

c

e

o

r

ob

s

t

ac

l

es

Model W D H W1 A B

T3 temp. sensor is only for 24 and 28k

4. Refrigerant Cycle Diagram

For heat pump models:

LIQUID SIDE

GAS SIDE

HEAT
EXCHANGE
(EVAPORATOR)

HEAT
EXCHANGE
(CONDENSER)

COMPRESSOR

2-WAY VALVE

3-WAY VALVE

4-WAY VALVE

COOLING

HEATING

T2 Evaporator
temp. sensor

T1 Room temp.
sensor

ACCUMULATOR

INDOOR OUTDOOR

CHECK VALVE
(Heating Model only)

CAPILIARY TUBE

MDSF-24HRN1-v/MDSF-28HRN1-vMDSF-24HRN1/MDSF-28HRN1

MDSF-07HRN1/MDSF-09HRN1/MDSF-12HRN1/MDSF-18HRN1

5. Wiring Diagram

5.1 Indoor Unit

CN6

CN3

CN2

RED

CN_TO

CN5

INDOOR MOTOR

INDOOR UNIT

TO OUTDOOR UNIT

1(L)

2(N)

S

CN_TIN

1 2 3 4 5 6 7 8

Y/G

BLUE

4-WAY TERMINAL

MAIN BOARD

2

1

1(2)3(4)
1(2)3(4)

2(4)

2

1

2

1

2

1

2

1

CN9

PLASAM

2

1

2

1

CN_L1 or CNL

M
~

Y/G

2

WHITE

CN_N1 or CNN

CN_S

FAN CAPACITOR BOARD

PC1_1

PC2_1

1 2 3 4 5

SWING MOTOR

M

5

1 2 3 4 5

CN10

This symbol indicates the element
is optional,the actual shape shall
be prevail.

Notes:

1 2 3 4 5
1 2 3 4 5

CN11

T1_room

T2_pipe

CN4

3

M

5

CN_HEAT

CNN

WHITE

WHITE

TRANSFORMER

ION

CN_N3
CN_N2

CN_ION

Or

Or

POWER BOARD

2

1

2

1

CN_ION

DISPLAY BOARD

Wire Contoller

2

OPTIONAL

CN3(CN301)

2

MDSF-07HRN1-v/MDSF-09HRN1-v/MDSF-12HRN1-v/MDSF-18HRN1-v

5.1 Indoor Unit

5.2 Outdoor Unit

MDOF-18HN1MDOF-07HN1/MDOF-09HN1/MDOF-12HN1

MDOF-28HN1

MDOF-24HN1

CT

TRANS1

COMP

CAP1

1

2

M

FAN2

VALVE

KM1

BLUE

BLUE

BLUE

BLUE

BLACK

BLACK

BLACK

BLACK

BLACK

WHITE

WHITE

RED

RED

RED

RED

CAP2

1

2

RT3

XP1

XS1

CN4

CN3

UNIT1

CN2

CN5

CN6

CN11

RED

RED

RED

RED

C

S

R

BLACK

CN10

CN9

CN8

CN1

RED

BLACK

XT1

1

N

L

S

2(N)

TO INDOOR UNIT

POWER SUPPLY

CODE

UNIT1

COMP

CAP1

CAP2

FAN2

XT1

Xt2

XP1,XS1

RT3

KM1

CT

TRANS1

CN1-CN11

PART NAME

OUTDOOR CONTROL PCB

COMPRESSOR

COMPRESSOR RUN CAPACITOR

OUTDOOR FAN CAPACITOR

OUTDOOR FAN

TERMINAL

MIDDLE TERMINAL

CONNECTORS

PIPE TEMPERATURE SENSOR

AC CONTACTOR

CURRENT INDUCTOR

TRANSFORMER

PCB SOCKETS

VALVE

REVERSING VALVE

Y/G

BLACK

PTCR

BLACK

OPTION

O.L.P

2

1

A1

A2

1

Y/G

3

(OR BLACK)

CN15

CN16

1

3(5)

2

4(6)

CT

TRANS1

COMP

CAP1

1

2

M

FAN2

VALVE

KM1

BLUE

BLUE

BLUE

BLUE

BLACK

BLACK

BLACK

BLACK

BLACK

WHITE

WHITE

RED

RED

RED

RED

CAP2

1

2

RT3

XP1

XS1

CN4

CN3

UNIT1

CN2

CN5

CN6

CN11

RED

RED

RED

RED

C

S

R

BLACK

CN10

CN9

CN8

CN1

RED

BLACK

XT1

1

N

L

S

2(N)

O INDOOR UNIT

POWER SUPPLY

CODE

UNIT1

COMP

CAP1

CAP2

FAN2

XT1

XT2、XT3

XP1,XS1

RT3

KM1

CT

TRANS1

CN1-CN11

PART NAME

OUTDOOR CONTROL PCB

COMPRESSOR

COMPRESSOR RUN CAPACITOR

OUTDOOR FAN CAPACITOR

OUTDOOR FAN

TERMINAL

MIDDLE TERMINAL

CONNECTORS

PIPE TEMPERATURE SENSOR

AC CONTACTOR

CURRENT INDUCTOR

TRANSFORMER

PCB SOCKETS

VALVE

REVERSING VALVE

Y/G

BLACK

PTCR

BLACK

OPTION

O.L.P

2

1

A1

A2

1

Y/G

3

(OR BLACK)

CN15

CN16

1

3

2

4

XT2

1

2

BLACK

MDOF-07HN1-v/MDOF-09HN1-v/MDOF-12HN1-v/MDOF-18HN1-v

11

2(N)2(N)

33

44

BLUEBLUE

SS

RR

REDRED

CC

BLACKBLACK

COMPRESSORCOMPRESSOR

OVERLOAD
RELAY

OVERLOAD
RELAY

BLACKBLACK

BLACKBLACK

4-WAY4-WA Y

REDRED

COMPRESSOR
CAPACITOR

COMPRESSOR
CAPACITOR

FAN
MOTOR

FAN
MOTOR

BLUEBLUE

REDRED

FAN CAPACITORFAN CAPACITOR

REDRED

RED

RED

BLACK

BLACK

CN1

CN2

TRANSFORMER

LOW TEMPERATURE
COOLING SYSTEM

TEMPERATURE
SENSOR

(LIN)

(N)

(LOUT)

(4WAY)

(N)

BLUE

BLUE(BLACK)BLUE(BLACK)

BLUE(BLACK)BLUE(BLACK)

C

L

H

RED

BLACK

GRAY(RED)

RED

FUSE

CC

MDOF-24HN1-v

XT2

CURRENT INDUCTOR

TRANSFORMER

COMPRESSOR

CAP1

1

2

M

OUTDOOR FAN

REVERSING VALVE

AC CONTACTOR

BLUE

BLUE

BLUE

BLACK

BLACK

BLACK

BLACK

BLACK

WHITE

WHITE

RED

RED

RED

RED

CAP2

1

2

RT 3 SENSOR

CN4

CN3

OUTDOOR CONTROL PCB

CN2

CN6

CN11

RED

RED

RED

RED

C

S

R

BLACK

CN10

CN9

CN8

CN1

RED

RED

RED

XT1

1

N

L

S

2(N)

TO INDOOR UNIT

POWER SUPPLY

Y/G

BLACK

PTCR

BLACK

OPTION

O.L.P

2

1

1

5

6

2

A1

A2

1

Y/G

BLUE

CN1

CN2

RED

LOW TEMPERATURE
COOLING SYSTEM

BLACK

BLACK

RED

TEMPERATURE SENSOR

BLACK

BLUE

BLUE

XT3

C

L

H

DE F R O S TI N G

RED ( )GRA Y

TH E R M OS T A T

FUS E

RED

HE A T E R

RED( )G RA Y

RED

CN5

BLACK

MDOF-28HN1-v

XT2

CURRENT INDUCTOR

TRANSFORMER

COMPRESSOR

CAP1

1

2

M

OUTDOOR FAN

REVERSING VALVE

AC CONTACTOR

BLUE

BLUE

BLUE

BLACK

BLACK

BLACK

BLACK

BLACK

WHITE

WHITE

RED

RED

RED

RED

CAP2

1

2

RT 3 SENSOR

CN4

CN3

OUTDOOR CONTROL PCB

CN2

CN6

CN11

RED

RED

RED

RED

C

S

R

BLACK

CN10

CN9

CN8

CN1

RED

RED

RED

XT1

1

N

L

S

2(N)

TO INDOOR UNIT

POWER SUPPLY

Y/G

BLACK

PTCR

BLACK

OPTION

O.L.P

2

1

1

5

6
2

A1

A2

1

Y/G

BLUE

CN1

CN2

RED

LOW TEMPERATURE
COOLING SYSTEM

BLACK

BLACK

RED

TEMPERATURE SENSOR

BLACK

BLUE

BLUE

XT3

C

L

H

DE F R O S TI N G

RED ( )GRA Y

TH E R M OS T A T

FUS E

RED

HE A T E R

RED( )G RA Y

RED

CN5

BLACK

6 Installation Details

6.1 Wrench torque sheet for installation

Outside diameter Torque Additional tightening torque

mm inch N.cm N.cm

Ф6.35 1/4 1500(153kgf.cm) 1600(163kgf.cm)

Ф9.52 3/8 2500(255kgf.cm) 2600(265kgf.cm)

Ф12.7 1/2 3500(357kgf.cm) 3600(367kgf.cm)

Ф15.9 5/8 4500(459kgf.cm) 4700(479kgf.cm)

Ф19 3/4 6500(663kgf.cm) 6700(683kgf.cm)

6.2 Connecting the cables

The power cord of connect should be selected according to the following specifications sheet.

Rated current of appliance Nominal cross-sectional area (mm²)

>3 and ≤6 0.75

>6 and ≤10 1

>10 and ≤16 1.5

>16 and ≤25 2.5

The cable size and the current of the fuse or switch are determined by the maximum current indicated

on the nameplate which located on the side panel of the unit. Please refer to the nameplate before

selecting the cable, fuse and switch.

MDSF-28HRN1+MDOF-28HN1

MDSF-24HRN1+MDOF-24HN1

MDSF-18HRN1+MDOF-18HN1

MDSF-12HRN1+MDOF-12HN1

MDSF-09HRN1+MDOF-09HN1

MDSF-07HRN1+MDOF-07HN1

6.3 Pipe length and the elevation

The pipe length and refrigerant amount:

Model

Pipe size

Standard

length

(m)

Max.

Elevation

B (m)

Max.

Length

A (m)

Additional

refrigerant

(g/m)

Gas Liquid

3/8’’

(

Ф9.52

)

1/4’’

(

Ф6.35

)

5 8 20 20

3/8’’

(

Ф9.52

)

1/4’’

(

Ф6.35

)

5 8 20 20

1/2’’

(

Ф12.7

)

1/4’’

(

Ф6.35

)

5 8 20 20

1/2’’

(

Ф12.7

)

1/4’’

(

Ф6.35

)

5 10 25 20

5/8’’

(

Ф15.9

)

3/8’’

(

Ф9.52

)

5 10 25 40

Caution:

The capacity test is based on the standard length and the maximum permissive length is based on the

system reliability.

The oil trap should be installed per 5-7 meters.

7. Operation Characteristics

CAUTION:

1. If the air conditioner is used beyond the above conditions, certain safety protection features

may come into operation and cause the unit to operate abnormally.

2. The room relative humidity should be less than 80%. If the air conditioner operates beyond this

figure, the surface of the air conditioner may attract condensation. Please set the vertical air flow

louver to its maximum angle (vertically to the floor), and set HIGH fan mode.

3. The optimum performance will be achieved during this operating temperature zone.

25

8. Electronic function

8.1 Abbreviation

T1: Indoor room temperature

T2: Coil temperature of evaporator

T3: Coil temperature of condenser

T4: Outdoor ambient temperature

T5: Compressor discharge temperature

8.3 Main Protection

8.3.1 Time Delay at restart for compressor.

8.3.2 Sensor protection at open circuit and breaking disconnection.

8.3.3 Zero crossing detection error protection

If AC can not detect zero crossing signal for 4 minutes or the zero crossing signal time interval is

not correct, the unit will stop and the LED will display the failure. The correct zero crossing signal

time interval should be between 6-13ms.

8.3.4 Fan Speed is out of control

When Indoor Fan Speed is too low(lower than 300RPM) lasting 2 minutes, the unit stops and LED

displays failure information and can’t returns to normal operation automatically.

8.3.5 Current protection

I3SEC

I5MIN

A

B

C

Resume

IFAN

IRESTORE

A zone : The current exceeds I

3SEC

for 5 seconds the

compressor and outdoor fan will shut off.

B zone: The current exceeds I

5min

for 5 minutes, the compressor and outdoor fan will shut off.

C zone: The current exceeds I

FAN

, the outdoor fan will shut off if AC is in heating mode. If AC is in

cooling mode, the indoor fan will run at low speed.

8.4 Operation Modes and Functions

8.4.1 Fan mode

(1) Outdoor fan and compressor stop.

(2) Temperature setting function is disabled, and no setting temperature is displayed.

(3) Indoor fan can be set to high/med/low/auto.

(4) The louver operates the same as in cooling mode.

(5) Auto fan:

29

28

High

Low

25

Medium

8.4.2 Cooling Mode

8.4.2.1 Compressor running rules

Once the compressor starts up, it will run 5.5 minutes. And then it will follow the below rules:

When indoor room temp.T1 is lower than Tn, the compressor and outdoor fan will shut off. When

T1 is higher than Tm, the compressor and outdoor fan will start up.

Tm=Ts, Tn=Ts-2.

8.4.2.2 Outdoor fan running rules

The On-off outdoor units have single fan speed. The outdoor fan will run following the compressor

except when AC is in evaporator high temp. protection in heating mode ,condenser high temp.

protection in cooling mode, defrosting mode and the current protection.

8.4.2.3 Indoor fan running rules

In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low

and auto.

The auto fan:

8.4.2.4 Low evaporator coil temperature T2 protection

TE6

T2

On

Off

TE5

When the evaporator coil temp.T2 keeps lower than TE5 for 5 minutes, the compressor and

outdoor fan will shut off. When T2 is higher than TE6, the compressor and outdoor fan will restart

up.

8.4.3 Heating Mode

8.4.3.1 Compressor running rules:

Once the compressor starts up, it will run 7 minutes. And then it will follow the below rules:

When indoor room temp.T1 is higher than Tj, the compressor and outdoor fan will shut off. When

T1 is lower than Tk, the compressor and outdoor fan will start up.

While Tj=Ts+TB; T

k

=Ts+TB-2

For 7, 9, 12 and 18k,

8.4.3.2 Outdoor fan running rules:

The outdoor units have single fan speed. The outdoor fan will run following the compressor except

when AC is in evaporator high temp. protection in heating mode , condenser high temp. protection

in cooling mode ,defrosting mode and the current protection.

8.4.3.3 Indoor fan running rules:
Auto fan action:

When T1-Ts>2℃, the indoor fan will run at low speed.

When T1-Ts≤0℃, the indoor fan will run at medium speed.

8.4.3.4 Defrosting mode：



Condition of defrosting:

1, AC will enter the defrosting mode if all of the following items(1.1,1.2,1.3 or 1.1, 1.2, 1.4) are

satisfied.

∆T′=∆T, if the indoor fan=low speed.

∆T′=∆T+3, if the indoor fan=medium speed.

∆T′=∆T+5, if the indoor fan=high speed.

∆T′max is the maximum value of ∆T′.

When fan speed changes( including anti-cold wind function), AC will detect ∆T after two minutes.

1.1 AC meets A1 or A2.

A1: The cumulative compressor running time is between 45~120 minutes. Meanwhile the value of

∆T meets the below table.

℃

∆T

High speed

＜TH

DEFROST

Medium speed

＜TM

DEFROST

Low speed

＜TL

DEFROST

A2: The cumulative compressor running time is over 120 minutes. Meanwhile the value of ∆T

meets the below table.

℃

∆T

High speed

＜TH

DEFROST

+2

Medium speed

＜TM

DEFROST

+2

Low speed

＜TL

DEFROST

+2

1.2 If the fan speed and the evaporator coil temp.T2 meet the below issues:

℃

T2

High speed

＜43℃

Medium speed

＜46℃

Low speed

＜48℃

1.3 After the compressor keeps running 8 minutes, ∆T′ max－∆T′ ≥6℃（∆T=T2-T1）

1.4 After the compressor keeps running 8 minutes, if -5℃<T1<45℃ and -5℃<T2<45℃, AC will

detect the △T. Mark the time of ∆T′ dropped 1.5 degree as t. When 1min<t< FALL08CTM, this

condition is satisfied.(FALL08CTM is controlled by EEPROM chip).

About the setting defrosting time:

runtime（minute） Defrosting time（minute）

Case 1 Runtime=45 10

Case 2

45＜runtime≤60

7.5

Case 3

60＜runtime≤90

8.5

Case 4

90＜runtime≤120

10

Case 5

120＜runtime

12

2, AC will enter the defrosting mode if all of the following items are satisfied:

2.1 The compressor cumulative running time is over 45 minutes.

2.2 The compressor continuous running time is over 8 minutes.

2.3 The indoor fan is off.

In this case, the defrosting time is ten minutes.

3, AC will enter the defrosting mode if all of the following items are satisfied:

3.1 After AC runs in heating mode, there is no defrosting before.

3.2 The cumulative compressor running time is over 45 minutes.

3.3 The 1.1 and 1.2 are satisfied if AC is in high/Medium/Low speed .Or the fan speed is breeze.

In this case, the defrosting time is ten minutes.

a) Condition of ending defrosting:

If any one of the following items is satisfied, the defrosting will terminate and the machine will turn

to normal heating mode.

(1) The defrosting time is reached to the setting value.

(2) The defrosting has been running for 3 minutes and T2≥2℃.

(3) The defrosting has been running for 2 minutes, check the value of T2. If T2

-T2min

≥2℃ during

4 minutes, the defrosting will terminate.

(4) The compressor current has reached to I

DEFROST

or above lasting 7 seconds, I

DEFROST

differs

in different models



Defrosting action：

Compressor

on

off

on

on

on

off

off

off

4-way valve

Outdoor fan

Indoor fan

Indoor fan breeze(10s)

DF-5

DF

Setting defrosting time

F8

DF-5

DF

For 24k

3minutes



Condition of defrosting:

AC will enter defrosting mode if any of the following items is satisfied.

(1) If T3<TC1 and the compressor keeps running over 45 minutes. Meanwhile T3＜TC3 for

(2) After the last defrosting, the time that the outdoor fan is off but the compressor is on in high T2

protection cumulates up to 90 minutes.

 Condition of ending defrosting:

If any one of the following items is satisfied, the defrosting will terminate and the machine will turn

to normal heating mode.

(1) T3 rises to be higher than TC2.

(2) The machine has run for 10 minutes in defrosting.

 Defrosting action：

8.4.3.5 High evaporator coil temp.T2 protection:

8.4.4 Auto-mode

This mode can be chosen with remote controller and the setting temperature can be changed

between 17~30℃.

In auto mode, the machine will choose cooling, heating or fan-only mode according to ∆T (∆T

=T1-Ts).

∆T=T1-Ts Running mode

∆T＞2℃

Cooling

-3≤∆T≤2℃

Fan-only

∆T<-3℃

Heating(For cooling only models, they

will run at fan speed)

AC will run in auto mode in the below cases:

（1） Pressing the forced auto button.

（2） If AC is off, it will run in auto mode when the timer on function is active.

（3） After setting the mode, AC will run in auto mode if the compressor keeps not running for

20 minutes.

8.4.5 Drying mode

8.4.5.1 The compressor is cycled running with 10 minutes on and then 5 minutes off. The indoor

fan will keep running at low speed.

8.4.5.2 In drying mode, if room temperature is lower than 10℃, the compressor will stop and not

resume until room temperature exceeds 13℃.

8.4.5.3 The evaporator anti-freezing protection is the same as that in cooling mode.

8.4.6 Forced operation function

Press the touch button continually, the AC will run as below sequence:

Forced auto →Forced cooling →Off

Forced cooling mode:

The compressor and outdoor fan keep running and the indoor fan runs at low speed. After running

for 30 minutes, AC will turn to auto mode with 24℃ setting temperature.

Forced auto mode:

The action of forced auto mode is the same as normal auto mode with 24℃ setting temperature.

 When AC receives signals, such as switch on, switch off, timer on, timer off, mode setting, fan

speed setting, sleeping mode setting, follow me setting, it will quit the forced operation.



The forced operation function can not be memorized if power off.

8.4.7 Timer function

8.4.7.1 Timing range is 24 hours.

8.4.7.2 Timer on. The machine will turn on automatically when reaching the setting time.

8.4.7.3 Timer off. The machine will turn off automatically when reaching the setting time.

8.4.7.4 Timer on/off. The machine will turn on automatically when reaching the setting “on” time,

and then turn off automatically when reaching the setting “off” time.

8.4.7.5 Timer off/on. The machine will turn off automatically when reaching the setting “off” time,

and then turn on automatically when reaching the setting “on” time.

8.4.7.6 The timer function will not change the AC current operation mode. Suppose AC is off now,

it will not start up firstly after setting the “timer off” function. And when reaching the setting time,

the timer LED will be off and the AC running mode has not been changed.

8.4.7.7 The setting time is relative time.

8.4.7.8 The AC will quit the timer function when it has malfunction.

8.4.8 Sleep function mode

8.4.8.1 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and turns

off.

8.4.8.2. Operation process in sleep mode is as follow:

When cooling, the setting temperature rises 1℃ (be lower than 30℃) every one hour, 2 hours

later the setting temperature stops rising and indoor fan is fixed as low speed.

When heating, the setting temperature decreases 1℃ (be higher than 17℃) every one hour, 2

hours later the setting temperature stops rising and indoor fan is fixed as low speed. (Anti-cold

wind function has the priority)

8.4.8.3 Timer setting is available

8.4.8.4 When user uses timer off function in sleep mode (or sleep function in timer off mode), if the

timing is less than 7 hours, sleep function will be cancelled when reaching the setting time. If the

timing is more than 7 hours, the machine will not stop until reaches the setting time in sleep mode.

The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart

module. In case of a sudden power failure, the module memorizes the setting conditions before

the power failure. The unit will resume the previous operation setting (not including swing function)

automatically after 3 minutes when power returns.

If the memorization condition is forced cooling mode, the unit will run in cooling mode for 30

minutes and turn to auto mode as 24℃ setting temp.

If AC is off before power off and AC is required to start up now, the compressor will have 1 minute

delay when power on. Other conditions, the compressor will have 3 minutes delay when restarts.

8.4.10 Refrigerant Leakage Detection

With this new technology, the display area will show “EC” when the outdoor unit detects refrigerant

leakage.

8.4.11 Louver Position Memory Function

When starting the unit again after shutting down, its louver will restore to the angle originally set by

the user, but the precondition is that the angle must be within the allowable range, if it exceeds, it

will memorize the maximum angle of the louver. During operation, if the power fails or the end

user shuts down the unit in the turbo mode, the louver will restore to the default angle.

8.4.12 8℃ Heating(optional)

In heating operation, the preset temperature of the air conditioner can be as lower as 8℃, which

keeps the room temperature steady at 8℃ and prevents household things freezing when the

house is unoccupied for a long time in severe cold weather.

8.4.9 Auto-Restart function

24/28k)

short circuit(only for 24/28k)

9. Troubleshooting

9.1 Indoor Unit Error Display

Operation lamp Timer lamp Display LED STATUS

☆ 1 time

X E1 EEPROM parameter error

☆ 2 times

X E2

Zero-crossing signal detection error(except

☆ 3 times

X E3 Indoor fan speed has been out of control

☆ 5 times

X E5

Indoor room temperature sensor T1 open circuit or

short circuit

☆ 6 times

X E6

Evaporator coil temperature sensor T2 open circuit or

short circuit

☆ 7 times

X E7

Condenser coil temperature sensor T3 open circuit or

☆ 2 times

O EC Refrigerant Leakage Detection

☆ 8 times

X E8

☆ 9 times

X E9

Indoor / outdoor units communication error(only for

O（light） X（off） ☆（flash）

9.2 Diagnosis and Solution

9.2.1 EEPROM parameter error diagnosis and solution

EEPROM: a read-only memory whose contents can be erased and reprogrammed using a pulsed

voltage.

9.2.2 Zero crossing detection error diagnosis and solution

9.2.3 Indoor fan speed has been out of control diagnosis and solution

Index 1:

1:Indoor AC Fan Motor

Measure the resistance value of each winding by using the tester.

For the resistance value of the motor, please contact the technical engineer.

Index2:

1: Indoor AC Fan Motor

Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds,

measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power

supply)or 50V(115V power supply), the PCB must has problems and need to be replaced.

9.2.4 Open circuit or short circuit of temperature sensors diagnosis and solution

9.2.5 Refrigerant Leakage Detection diagnosis and solution

Is there cool air blowing
out from indoor air outlet?

Yes

Yes

Check if T2 sensor is well

fixed. Correct the installation

or replace T2 sensor. Does

the problem remain again?

No

Is there any leakage? Especially
the connection parts, such as the
gas valve and the liquid valve.

No

Shut off the power supply and
turn it on 5 seconds later. Is it
still displaying the error code?

Replace indoor PCB.

Yes

Repair the leakage and

recharge the refrigerant.

Yes

Clear the blocking.

Yes

Is there any block i n g ? (Such as the
capillary or the welded points of the pipes.)

9.2.6 Indoor / outdoor units communication error diagnosis and solution

Main parts check

1.Temperature sensor checking

Disconnect the temperature sensor from PCB, measure the resistance value with a tester.

Temperature Sensors.

Room temp.(T1) sensor,

Indoor coil temp.(T2) sensor,

Outdoor coil temp.(T3) sensor,

Outdoor ambient temp.(T4) sensor,

Compressor discharge temp.(T5) sensor.

Measure the resistance value of each winding by using the multi-meter.

Table1:Some frequently-used R-T data for T1,T2,T3 and T4 sensor:

Temperature (℃)

5 10 15 20 25 30 40 50 60

Resistance Value (KΩ) 26.9 20.7 16.1 12.6 10 8 5.2 3.5 2.4

Table2:Some frequently-used R-T data for T5 sensor:

Temperature (℃)

5 15 25 35 60 70 80 90 100

Resistance Value (KΩ) 141.6 88 56.1 36.6 13.8 9.7 6.9 5 3.7

Resistance value (KΩ)

Temperature (℃)

T5

T1,T2,T3,T4