Midea M3OD-21HFN1-Q, M2OD-16HFN1-Q, M3OD-26HFN1-Q, M3OD-27HFN1-Q, M4OD-28HFN1-Q Service Manual

SERVICE MANUAL

MIDEA AIRCONDITIONER

EUROPE MARKET

SUPER DC INVERTER MULTI TYPE

M2OD-14HFN1-Q M2OD-16HFN1-Q M2OD-18HFN1-Q M3OD-21HFN1-Q M3OD-26HFN1-Q M3OD-27HFN1-Q M4OD-28HFN1-Q M4OA-36HFN1-Q M5OC-36HFN1-Q M5OD-42HFN1-Q

DC MULTI OUTDOOR UNITS

CONTENTS

1. General information of Outdoor Units .......................................... 3

2. Features .......................................................................................... 4

3. Dimensions ..................................................................................... 5

4. Wiring Diagram ............................................................................. 12

5. Refrigeration Cycle Diagram ....................................................... 16

6. Indoor units combination ............................................................ 19

7. Sound Levels ................................................................................ 22

8. Installation Details ........................................................................ 23

9. Electronic control function .......................................................... 34

10. Troubleshooting ......................................................................... 40

1. General information of Outdoor Units

Model name

Dimension (mm)

Compressor

M2OD-14HFN1-Q

845x320x700

DA130M1C-31FZ

M2OD-16HFN1-Q

810x310x558

ASN108D22UEZ

M2OD-18HFN1-Q

810x310x558

DA130M1C-31FZ

M2OD-18HFN1-Q

845x320x700

DA150S1C-20FZ

M3OD-21HFN1-Q

845x320x700

DA150S1C-20FZ

M3OD-26HFN1-Q

845x320x700

DA150S1C-20FZ

M3OD-27HFN1-Q

900x315x860

DA250S2C-30MT

M4OD-28HFN1-Q

900x315x860

DA250S2C-30MT

M4OA-36HFN1-Q

990x345x965

TNB306FPGMC-L

M5OC-36HFN1-Q

990x345x965

TNB306FPGMC-L

M5OD-42HFN1-Q

990x345x965

MNB36FAAMC-L

2. Features

The hydrophilic fin can improve the heating efficiency at operation mode.

It protects the valves and prevents water from dripping.

4 way valve control

It is only operated in the heating operation mode except defrosting operation.

Outdoor unit

Power relay control

Hydrophilic aluminum fin

Anti-rust cabinet

Valve protection cover

Low noise air flow system

Discharge pipe temperature protection

3. Dimensions

M2OD-14HFN1-Q, M2OD-18HFN1-Q

560 W1

H

6

D1 335 D2 360

845 W

313

D3

335

D1

R6

R5

A1 22

A2 50

B1

120

110

B2

700

W2

73

58

110

H1

H2

200.7

243.6

L1

L2

M2OD-16HFN1-Q, M2OD-18HFN1-Q(W190)

D2 348

558

H

W2

64

795 W

549 W1

810 W3

A2

61.6

A1

25.4

R20

R7.7

289

D3

D1 325

10

B1

66.6

B2

104.2

50 H1

90 H2

M3OD-21HFN1-Q, M3OD-26HFN1-Q

560 W1

H

6

D1 335 D2 360

845 W

313

D3

335

D1

R6

R5

A1 22

A2 50

B1

120

110

B2

700

W2

73

58

58 58

58

110

H1

H2

200.7

243.6

L1

L2

M3OD-27HFN1-Q

900 W

590 W1

860

H

12

D2 355

D1 333

302

D3

333

D1

50

97

90

B2

B1

8

A2

5555 55 55 55110

62

W2

H1

H2

R6

238.4

285.7

L1

L2

M4OD-28HFN1-Q

900 W

590 W1

860

H

12

D2 355

D1 333

302

D3

333

D1

50

97

90

B2

B1

8

A2

5555 55 55 55 55 55110

62

W2

H1

H2

R6

238.4

285.7

L1

L2

M4OA-36HFN1-Q

624 W1

990 WD2 397

D1 366

965

10

H

78

W2

340

366

D3

D1

125

145

B1

B2

60

22

A2

A1

55

140

H1

H2

R5

R6

M5OC-36HFN1-Q, M5OD-42HFN1-Q

990 W

W2 81

624 W1

D2 397

D1 366

55 H1

965 H

153 H2

366 D1

B2 125

B1 145

D3 345

60

22

A2

A1

R5

R6

4. Wiring Diagram

M2OD-14HFN1-Q, M2OD-18HFN1-Q

M2OD-16HFN1-Q, M2OD-18HFN1-Q(W190)

M3OD-27HFN1-Q, M3OD-21HFN1-Q, M3OD-26HFN1-Q

M4OD-28HFN1-Q

M4OA-36HFN1-Q

M5OC-36HFN1-Q, M5OD-42HFN1-Q

5. Refrigeration Cycle Diagram

5.1 Refrigeration circuit drawing of inverter 1 drive 2 type

LIQUID VALVE A

GAS VALVE A

HEAT EXCHANGE (EVAPORATOR)

HEAT EXCHANGE (CONDENSER)

Compressor

4-WAY VALVE

COOLING HEATING

T2 Evaporator temp. sensor middle

T1 Room temp. sensor

T3 Condenser temp. sensor

T5 Discharge temp. sensor

T4 Ambient temp. sensor

INDOOR OUTDOOR

EXV A

CAPILIARY A

CHECK VALVE

CAPILIARY TUBE

EXV B

CAPILIARY B

LIQUID VALVE B

GAS VALVE B

Accumulator

T2B-A Evaporator

temp. sensor outlet

T2B-B

5.2 Refrigeration circuit drawing of inverter 1 drive 3 type

LIQUID VALVE A

GAS VALVE A

HEAT EXCHANGE (EVAPORATOR)

HEAT EXCHANGE (CONDENSER)

Compressor

4-WAY VALVE

COOLING HEATING

T2 Evaporator temp. sensor middle

T1 Room temp. sensor

T3 Condenser temp. sensor

T5 Discharge temp. sensor

T4 Ambient temp. sensor

INDOOR OUTDOOR

EXV A

CAPILIARY A

CHECK VALVE

CAPILIARY TUBE

EXV B

CAPILIARY B

LIQUID VALVE B

GAS VALVE B

EXV C

CAPILIARY C

LIQUID VALVE C

GAS VALVE C

Accumulator

T2B-A Evaporator

temp. sensor outlet

T2B-B

T2B-C

5.3 Refrigeration circuit drawing of inverter 1 drive 4 type

LIQUID VALVE A

GAS VALVE A

HEAT EXCHANGE (EVAPORATOR)

HEAT EXCHANGE (CONDENSER)

Compressor

4-WAY VALVE

COOLING HEATING

T2 Evaporator temp. sensor middle

T1 Room temp. sensor

T3 Condenser temp. sensor

T5 Discharge temp. sensor

T4 Ambient temp. sensor

INDOOR OUTDOOR

EXV A

CAPILIARY A

CHECK VALVE

CAPILIARY TUBE

EXV B

CAPILIARY B

LIQUID VALVE B

GAS VALVE B

EXV C

CAPILIARY C

LIQUID VALVE C

GAS VALVE C

EXV D

CAPILIARY D

LIQUID VALVE D

GAS VALVE D

Accumulator

High pressure switch

Low pressure

switch

T2B-A Evaporator

temp. sensor outlet

T2B-B

T2B-C

T2B-D

5.4 Refrigeration circuit drawing of M5OC-36HFN1-Q

LIQUID VALVE A

GAS VALVE A

HEAT EXCHANGE (EVAPORATOR)

HEAT EXCHANGE (CONDENSER)

COOLING HEATING

T2 Evaporator temp. sensor middle

T1 Room temp. sensor

T3 Condenser temp. sensor

T4 Ambient temp. sensor

INDOOR OUTDOOR

EXV A

CAPILIARY A

CHECK VALVE

CAPILIARY TUBE

EXV B

CAPILIARY B

LIQUID VALVE B

GAS VALVE B

EXV C

CAPILIARY C

LIQUID VALVE C

GAS VALVE C

EXV D

CAPILIARY D

LIQUID VALVE D

GAS VALVE D

EXV E

CAPILIARY E

LIQUID VALVE E

GAS VALVE E

Compressor

4-WAY VALVE

T5 Discharge temp. sensor

Accumulator

High pressure switch

Low pressure

switch

T2B-A Evaporator

temp. sensor outlet

T2B-B

T2B-C

T2B-D

T2B-E

5.5 Refrigeration circuit drawing of M5OD-42HFN1-Q

LIQUID VALVE A

GAS VALVE A

HEAT EXCHANGE (EVAPORATOR)

HEAT EXCHANGE (CONDENSER)

COOLING HEATING

T2 Evaporator temp. sensor

T1 Room temp. sensor

T3 Condenser temp. sensor

T4 Ambient temp. sensor

INDOOR OUTDOOR

EXV A

CAPILIARY A

CHECK VALVE

CAPILIARY TUBE

EXV B

CAPILIARY B

LIQUID VALVE B

GAS VALVE B

EXV C

CAPILIARY C

LIQUID VALVE C

GAS VALVE C

EXV D

CAPILIARY D

LIQUID VALVE D

GAS VALVE D

EXV E

CAPILIARY E

LIQUID VALVE E

GAS VALVE E

Compressor

4-WAY VALVE

T5 Discharge temp. sensor

Accumulator

High pressure

switch

Low pressure

switch

6. Indoor units combination

6.1 Indoor unit combination for M2OD-14HFN1-Q

One unit

Two unit

7

7+7

9+9 9 7+9

9+12

12

7+12 18

6.2 Indoor unit combination for M2OD-16HFN1-Q

One unit

Two unit

7

7+7

9+9 9 7+9

9+12

12

7+12

6.3 Indoor unit combination for M2OD-18HFN1-Q

One unit

Two unit

7

7+7

9+9 9 7+9

9+12

12

7+12

9+18

18

7+18

12+12

6.4 Indoor unit combination for M3OD-21HFN1-Q, M3OD-26HFN1-Q

One unit

Two unit

Three unit

7

7+7

9+9

7+7+7

7+9+12

9

7+9

9+12

7+7+9

9+9+9

12

7+12

9+18

7+7+12

9+9+12

18

7+18

12+12

7+9+9

6.5 Indoor unit combination for M3OD-27HFN1-Q

One unit

Two unit

Three unit

7

7+7

9+9

12+18

7+7+7

7+9+9

7+12+18

9+12+12

9

7+9

9+12

18+18

7+7+9

7+9+12

9+9+9

9+12+18

12

7+12

9+18

7+7+12

7+9+18

9+9+12

12+12+12

18

7+18

12+12

7+7+18

7+12+12

9+9+18

6.6 Indoor unit combination for M4OD-28HFN1-Q

6.7 Indoor unit combination for M4OA-36HFN1-Q

6.8 Indoor unit combination for M5OC-36HFN1-Q

One Unit

Two Unit

Three Unit

7

7+7

9+12

7+7+7

7+9+18

9+9+18

12+18+18

9

7+9

9+18

7+7+9

7+12+12

9+12+12

18+18+18

12

7+12

12+12

7+7+12

7+12+18

9+12+18

18

7+18

12+18

7+7+18

7+18+18

9+18+18

9+9

18+18

7+9+9

9+9+9

12+12+12

7+9+12

9+9+12

12+12+18

Four Unit

7+7+7+7

7+7+9+18

7+9+9+18

7+12+18+18

9+9+18+18

7+7+7+9

7+7+12+12

7+9+12+12

9+9+9+9

9+12+12+12

7+7+7+12

7+7+12+18

7+9+12+18

9+9+9+12

9+12+12+18

7+7+7+18

7+7+18+18

7+9+18+18

9+9+9+18

12+12+12+12

7+7+9+9

7+9+9+9

7+12+12+12

9+9+12+12

12+12+12+18

7+7+9+12

7+9+9+12

7+12+12+18

9+9+12+18

Five Unit

7+7+7+7+7

7+7+7+9+18

7+7+9+12+18

7+9+9+12+18

9+9+9+12+12

7+7+7+7+9

7+7+7+12+18

7+7+12+12+18

7+9+12+12+12

9+9+9+12+18

7+7+7+7+12

7+7+7+18+18

7+9+9+9+9

7+9+12+12+18

9+9+12+12+12

One unit

Two unit

Three unit

Four unit

7

7+7

9+9

12+18

7+7+7

7+9+9

9+9+9

7+7+7+7

7+7+9+9

7+9+9+12

9

7+9

9+12

18+18

7+7+9

7+9+12

9+9+12

7+7+7+9

7+7+9+12

7+9+12+12

12

7+12

9+18

7+7+12

7+9+18

9+9+18

7+7+7+12

7+7+12+12

9+9+9+9

18

7+18

12+12

7+7+18

7+12+12

9+12+12

7+7+7+18

7+9+9+9

9+9+9+12

7+12+18

One unit

Two unit

Three unit

Four unit

7

7+7

9+9

12+12

7+7+7

7+12+12

9+12+18

7+7+7+7

7+7+12+12

7+9+12+18

9+9+12+12

9

7+9

9+12

12+18

7+7+9

7+12+18

9+18+18

7+7+7+9

7+7+12+18

7+9+18+18

9+9+12+18

12

7+12

9+18

18+18

7+7+12

7+18+18

12+12+12

7+7+7+12

7+7+18+18

7+12+12+12

9+12+12+12

18

7+18

7+7+18

9+9+9

12+12+18

7+7+7+18

7+9+9+9

7+12+12+18

9+12+12+18

7+9+9

9+9+12

12+18+18

7+7+9+9

7+9+9+12

9+9+9+9

12+12+12+12

7+9+12

9+9+18

7+7+9+12

7+9+9+18

9+9+9+12

12+12+12+18

7+9+18

9+12+12

7+7+9+18

7+9+12+12

9+9+9+18

7+7+7+7+18

7+7+9+9+9

7+9+9+9+12

9+9+9+9+9

9+12+12+12+12

7+7+7+9+9

7+7+9+9+12

7+9+9+9+18

9+9+9+9+12

12+12+12+12+12

7+7+7+9+12

7+7+9+9+18

7+9+9+12+12

9+9+9+9+18

6.9 Indoor unit combination for M5OD-42HFN1-Q

One Unit

Two Unit

Three Unit

7

7+7

9+9

7+7+7

7+9+24

9+9+24

12+18+18

9

7+9

9+12

7+7+9

7+12+12

9+12+12

18+18+18

12

7+12

9+18

7+7+12

7+12+18

9+12+18

18

7+18

9+24

7+7+18

7+12+24

9+12+24

24

7+24

12+12

7+7+24

7+18+18

9+18+18

12+18

7+9+9

9+9+9

12+12+12

12+24

7+9+12

9+9+12

12+12+18

18+18

7+9+18

9+9+18

12+12+24

Four Unit

7+7+7+7

7+7+9+24

7+9+9+24

7+12+18+18

9+9+18+18

7+7+7+9

7+7+12+12

7+9+12+12

9+9+9+9

9+12+12+12

7+7+7+12

7+7+12+18

7+9+12+18

9+9+9+12

9+12+12+18

7+7+7+18

7+7+12+24

7+9+12+24

9+9+9+18

12+12+12+12

7+7+7+24

7+7+18+18

7+9+18+18

9+9+9+24

12+12+12+18

7+7+9+9

7+9+9+9

7+12+12+12

9+9+12+12

7+7+9+12

7+9+9+12

7+12+12+18

9+9+12+18

7+7+9+18

7+9+9+18

7+12+12+24

9+9+12+24

Five Unit

7+7+7+7+7

7+7+7+9+18

7+7+9+12+18

7+9+9+12+18

9+9+9+12+12

7+7+7+7+9

7+7+7+12+18

7+7+12+12+18

7+9+12+12+12

9+9+9+12+18

7+7+7+7+12

7+7+7+18+18

7+9+9+9+9

7+9+12+12+18

9+9+12+12+12

7+7+7+7+18

7+7+9+9+9

7+9+9+9+12

9+9+9+9+9

9+12+12+12+12

7+7+7+7+24

7+7+9+9+12

7+9+9+9+18

9+9+9+9+12

12+12+12+12+12

7+7+7+9+9

7+7+9+9+18

7+9+9+12+12

9+9+9+9+18

7+7+7+9+12

7. Sound Levels

H

1.0m

Outdoor Unit

Microphone

Note: H= 0.5 × height of outdoor unit

Model

Noise Power dB(A)

Noise level dB(A)

M2OD-14HFN1-Q

63

62

M2OD-16HFN1-Q

65

56

M2OD-18HFN1-Q(W190)

65

56

M2OD-18HFN1-Q(W210)

63

62

M3OD-21HFN1-Q

68

59

M3OD-26HFN1-Q

68

58

M3OD-27HFN1-Q

68

62

M4OD-28HFN1-Q

70

62

M4OA-36HFN1-Q

70

65

M5OC-36HFN1-Q

68

65

M5OD-42HFN1-Q

72

66

8. Installation Details

8.1 Wrench torque sheet for installation

Outside diameter

Torque

Additional tightening torque

mm

N.cm

Ф6.35

1500(153kgf.cm)

1600(163kgf.cm)

Ф9.52

2500(255kgf.cm)

2600(265kgf.cm)

Ф12.7

3500(357kgf.cm)

3600(367kgf.cm)

8.2 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.

8.3 Pipe length and the elevation

Maximum piping length and height difference

1 drive 2

1 drive 3

1 drive 4

1 drive 5

Max. length for all rooms (m)

30

45

60

75

Max. length for one IU (m)

20

25

30

Max. height difference between IU and OU (m)

OU higher than IU

10

OU lower than IU

15

Max. height difference between IUs (m)

10

Additional refrigerant charge

1 drive 2

1 drive 3

1 drive 4

1 drive 5

Chargeless pipe

length (m)

10

15

20

25

Additional

refrigerant charge

(g)

15 x (length for all

rooms - 10)

15 x (length for all

rooms - 15)

15 x (length for all

rooms - 20)

15 x (length for all

rooms - 25)

Caution:

● Refrigerant pipe diameter is different according to indoor unit to be connected. When using the extension pipe, refer to the tables below.

● When refrigerant pipe diameter is different from that of outdoor unit union (for 18K indoor unit), additional transfer connector needs to be used on outdoor unit union.

Indoor unit

Extension pipe diameter (mm/inch)

Model

Pipe diameter (mm/inch)

7K9K12K Liquid

6.35(1/4)

Liquid

6.35(1/4)

Gas

9.52(3/8)

Gas

9.52(3/8)

18K Liquid

6.35(1/4)

Liquid

6.35(1/4)

Gas

12.7(1/2)

Gas

12.7(1/2)

Outdoor unit union diameter (mm/inch)

Indoor unit A/B/C/D Liquid

6.35(1/4)

Gas

9.52(3/8)

8.4 Installation for the first time

Air and moisture in the refrigerant system have undesirable effects as below:

● Pressure in the system rises.

● Operating current rises.

● Cooling or heating efficiency drops.

● Moisture in the refrigerant circuit may freeze and block capillary tubing.

● Water may lead to corrosion of parts in the refrigerant system.

Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and

evacuated to remove gas and moisture from the system.

Gas leak check (Soap water method):

Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles come out, the pipes have leakage.

1. Air purging with vacuum pump

1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and 3-way

valves are set to the closed position.

2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port..

3) Connect the charge hose of handle hi connection to the vacuum pump.

4) Fully open the handle Lo of the manifold valve.

5) Operate the vacuum pump to evacuate.

6) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If the

pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points. Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm

that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

7) Turn the flare nut of the 3-way valves about 45° counterclockwise for 6 or 7seconds after the gas coming out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a

little higher than the atmosphere pressure. Then remove the charge hose from the 3 way valve.

8) Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve.

2. Air purging by refrigerant

(Indoor unit)

(Liquid side)

(Gas side)

Vacuum

pump

Vacuum

pump

Lo

Hi

Handle Hi

Two-way valve

Close

Manifold valve

Compound meter

Pressure

gauge

-0.1MPa

Handle Lo

Charge hose

(Outdoor unit)

Close

Three-way valve

Procedure:

1). Confirm that both the 2-way and 3-way valves are set to the closed position.

2). Connect the charge set and a charging cylinder to the service port of the 3-way valve.

3). Air purging. Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the 2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times. After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.

4). Check the gas leakage. Check the flare connections for gas leakage.

5). Discharge the refrigerant. Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa.

6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open position. Be sure to use a hexagonal wrench to operate the valve stems.

7). Mount the valve stems nuts and the service port cap. Be sure to use a torque wrench to tighten the service port cap to a torque 18N·m. Be sure to check the gas leakage.

3. Adding the refrigerant if the pipe length >5m

Procedure:

1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the

cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure the liquid charge.

2). Purge the air from the charge hose. Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be

careful of the liquid refrigerant).

3) Put the charging cylinder onto the electronic scale and record the weight.

4) Operate the air conditioner at the cooling mode.

5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.

6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose.

7). Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage.

Electronic scale

8.5 Adding the refrigerant after running the system for many years

Procedure:

1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve. Connect the charge hose to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the

cylinder bottom up to ensure liquid charge.

2). Purge the air from the charge hose. Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be

careful of the liquid refrigerant).

3) Put the charging cylinder onto the electronic scale and record the weight.

4) Operate the air conditioner at the cooling mode.

5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.

6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low side), disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose.

7). Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage.

8.6 Re-installation while the indoor unit need to be repaired

1. Collecting the refrigerant into the outdoor unit

Electronic scale

Procedure

1). Confirm that both the 2-way and 3-way valves are set to the opened position Remove the valve stem caps and confirm that the valve stems are in the opened position. Be sure to use a hexagonal wrench to operate the valve stems.

2). Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.

3). Air purging of the charge hose. Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly.

4). Set the 2-way valve to the close position.

5). Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.

6). Set the 3-way valve to the closed position immediately Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa. Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts. Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 kgf.m. Be sure to check for gas leakage.

2. Air purging by the refrigerant

Procedure:

1). Confirm that both the 2-way and 3-way valves are set to the closed position.

2). Connect the charge set and a charging cylinder to the service port of the 3-way valve Leave the valve on the charging cylinder closed.

3). Air purging. Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the 2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times. After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.

4). Check the gas leakage Check the flare connections for gas leakage.

5). Discharge the refrigerant. Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa.

6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems.

7). Mount the valve stems nuts and the service port cap Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.

Be sure to check the gas leakage.

8.7 Re-installation while the outdoor unit need to be repaired

1. Evacuation for the whole system

Procedure:

1). Confirm that both the 2-way and 3-way valves are set to the opened position.

2). Connect the vacuum pump to 3-way valve’s service port.

3). Evacuation for approximately one hour. Confirm that the compound meter indicates -0.1Mpa.

4). Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

5). Disconnect the charge hose from the vacuum pump.

2. Refrigerant charging

Procedure:

1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the

cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge.

2). Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be

careful of the liquid refrigerant).

3) Put the charging cylinder onto the electronic scale and record the weight.

4). Open the valves (Low side) on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant, or can be charged with a little at a time (approximately 150g each time) , operating the air conditioner in the cooling cycle; however, one time is not sufficient, wait approximately 1 minute and then repeat the procedure.

5).When the electronic scale displays the proper weight, disconnect the charge hose from the 3-way valve’s service port immediately

If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air conditioner before disconnecting the hose.

6). Mounted the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage

For M5OD-42HFN1-Q.There are one low-pressure centralized valve and one high-pressure centralized valve, it will be more time saving when vacumm and recycle refrigerant. But refer to the previous instruction when vacumm and recycle refrigerant.

9. Electronic control function

9.1 Abbreviation

T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger middle. T2B: Coil temperature of indoor heat exchanger outlet. T3: Coil temperature of outdoor heat exchanger T4: Outdoor ambient temperature T5: Compressor discharge temperature Ts: Setting temperature

9.2 Electric control working environment.

9.2.1 Input voltage: 198V~264V.

9.2.2 Input power frequency:50Hz.

9.2.3 Indoor fan normal working amp. is less than 1A.

9.2.4 Outdoor fan. Normal working amp. is less than 1.5A.

9.2.5 Four-way valve normal working amp. is less than 1A.

9.3 Outdoor unit’s digital display tube

There is a digital display tube in outdoor PCB. Digital display tube display function

 In standby , the LED displays “- -”  In compressor operation, the LED display the running frequency,  In defrosting mode, The LED displays “dF” or alternative displays between running frequency and

“dF”(each displays 0.5s)

 In compressor pre-heating, The LED displays “PH” or alternative displays between running frequency

and “PH”(each displays 0.5s)

 During the oil return process, The LED displays “RO” or alternative displays between running

frequency and “RO”(each displays 0.5s)

 In low ambient cooling mode, the LED displays “LC” or alternative displays between running

frequency and “LC”(each displays 0.5s)

 In forced cooling mode, the LED displays “FC” or alternative displays between running frequency and

“FC”(each displays 0.5s)

 When PFC module protection occurs three times within 15 minutes, the LED displays “E6” or

alternative displays between running frequency and “E6”(each displays 0.5s)

 In protection or malfunction, the LED displays error code or protection code.

9.4 Outdoor unit point check function

There is a check switch in outdoor PCB.

Press the switch N times it will display the content corresponding to No. N. After getting into the check function, it will display No. N with 1.5s, meanwhile the low bit decimal of digit display flashing, indicated to get into the check function display. After 1.5s, it will display the content corresponding to No. N.

the digital display tube will display the follow procedure when push SW1 each time.

Display

Remark

0

Normal display

Display running frequency, running state or malfunction code

1

No. of indoor units in good connection

Actual data

2

Outdoor unit running mode code

Off:0,Fan only 1, Cooling:2, Heating:3, Forced cooling:4

3

A indoor unit capacity

The capacity unit is horse power. If the indoor unit is not connected, the digital display tube will show: “――”

(7K:0.8HP, 9K:1HP,12K:1.2HP,18K:1.5HP)

4

B indoor unit capacity

5

C indoor unit capacity

6

D indoor unit capacity

7

E indoor unit capacity

8

A Indoor unit capacity demand code

Norm value*HP (7K:0.8HP, 9K:1HP,12K:1.2HP,18K:1.5HP)

9

B Indoor unit capacity demand code

10

C Indoor unit capacity demand code

11

D Indoor unit capacity demand code

12

E Indoor unit capacity demand code

13

Total indoor units amendatory capacity demand code

Forced cooling:7

14

The frequency corresponding to the total indoor units amendatory capacity demand

15

The frequency after the frequency limit

16

The frequency sending to compressor control chip

17

A indoor unit evaporator outlet temp.(T2BA)

If the temp. is lower than -9 degree, the digital display tube will show

“-9”.If the temp. is higher than 70 degree, the digital display tube will show “70”. If the indoor unit is not connected, the digital display tube will show: “――”

18

B indoor unit evaporator outlet temp.(T2BB)

19

C indoor unit evaporator outlet temp.(T2BC)

20

D indoor unit evaporator outlet temp.(T2BD)

21

E indoor unit evaporator outlet temp.(T2BE)

22

A indoor unit room temp.(T1A)

If the temp. is lower than 0 degree, the digital display tube will show

“0”.If the temp. is higher than 50 degree, the digital display tube will show “50”. If the indoor unit is not connected, the digital display tube

will show: “――”

23

B indoor unit room temp.(T1B)

24

C indoor unit room temp.(T1C)

25

D indoor unit room temp.(T1D)

26

E indoor unit room temp.(T1E)

27

A indoor unit evaporator temp.(T2A)

If the temp. is lower than -9 degree, the digital display tube will show “-9”.If the temp. is higher than 70 degree, the digital display tube will show “70”. If the indoor unit is not connected, the digital display tube will show: “――”

28

B indoor unit evaporator temp.(T2B)

29

C indoor unit evaporator temp.(T2C)

30

D indoor unit evaporator temp.(T2D)

31

E indoor unit evaporator temp.(T2E)

32

Condenser pipe temp.(T3)

33

Outdoor ambient temp.(T4)

34

Compressor discharge temp.(T5)

The display value is between 30~129 degree. If the temp. is lower

than 30 degree, the digital display tube will show “30”.If the temp. is

higher than 99 degree, the digital display tube will show single digit

and tens digit. For example, the digital display tube show “0.5”,it

means the compressor discharge temp. is 105 degree.)

35

AD value of current

The display value is hex number.

36

AD value of voltage

For example ,the digital display tube show “Cd”, it means AD value is

205.

37

EXV open angle for A indoor unit

Actual data/4. If the value is higher than 99, the digital display tube will show single

digit and tens digit. For example ,the digital display tube show “2.0”,it means the EXV

open angle is 120×4=480p.)

38

EXV open angle for B indoor unit

39

EXV open angle for C indoor unit

40

EXV open angle for D indoor unit

41

EXV open angle for E indoor unit

42

Frequency limit symbol

Bit7

Frequency limit caused by IGBT radiator

The display value is hex number. For example, the digital display tube show 2A,then Bit5=1, Bit3=1, Bit1=1.

It means frequency limit caused by T4,T3 and current.

Bit6

Frequency limit caused by PFC

Bit5

Frequency limit caused by T4.

Bit4

Frequency limit caused by T2.

Bit3

Frequency limit caused by T3.

Bit2

Frequency limit caused by T5.

Bit1

Frequency limit caused by current

Bit0

Frequency limit caused by voltage

43

Average value of T2

(Sum T2 value of all indoor units)/( number of indoor units in good connection)

44

Outdoor unit fan motor state

Off:0, High speed:1, Med speed:2, Low speed:3 Breeze:4, Super breeze:5

45

The last error or protection code

00 means no malfunction and protection

The following items from 9.4.1 to 9.4.5 are for the explanation of the point check functions.

9.4.1 Frequency of compressor:

Display

Frequency of compressor (Hz)

30

--

Stand by

60

9.4.2 Running mode:

Display

Corresponding mode

0

Off 1 Fan only

2

Cooling mode

3

Heating mode

4

Forced cooling

9.4.3 Capacity demand: Cooling mode

T1 Ts

3

1

e

c

a

4

2

0

2

3

0

1

f

d

b

Capacity area

a b c d e

f

Norm value (N)

3 2 1.5 1 0.5

0

Heating mode

T1 Ts

4

0

a

3

1

-1

3

1

2

0

b

c

d

e

f

2

Capacity area

a b c d e

f

Norm value (N)

3 2 1.5 1 0.5

0

9.4.4 Number of indoor unit

Display

Number of indoor unit

1 1 2

2

3 3 4

4

5

9.4.5 Opening degree of electronic expansion valve: Actual opening degree equals the display data times 4

9.5 Protection

9.5.1 Three minutes delay at restart for compressor.

9.5.2 Temperature protection of compressor discharge.

When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules:

----If 102℃<T5<115℃, decrease the frequency to the lower level every 2 minutes till to F1.

---If T5>115℃ for 10 seconds, the compressor will stop and restart till T5<90℃.

9.4.3 Low voltage protection

VOLT_RST1_ADD

VOLTAGE

No limit

VOLT_LTM1_ADD

VOLT_RST2_ADD

VOLT_LTM2_ADD

VOLT_LTM_FREQ1_ADD

VOLT_LTM_FREQ2_ADD

Note: if the low voltage protection occurs and not resumes within 3min, it will keep the protection always after restart the machine.

9.5.4 Compressor current limit protection

If the compressor current exceeds the current limit value for 10 seconds, the compressor frequency will be limited as below table.

Cooling mode:

Current frequency（Hz）

Current limit value（A）

Frequency limit

COOL_F16

ICOOLLMT12

Decrease the frequency to COOL_F4 and run at COOL_F4 for 3 minutes.

After that, the frequency will be adjusted according to the capacity demand and rise to the upper level every 3 minutes

(When the frequency>COOL_F4 via capacity demand).

COOL_F15

ICOOLLMT11

COOL_F14

ICOOLLMT10

COOL_F13

ICOOLLMT9

COOL_F12

ICOOLLMT8

COOL_F11

ICOOLLMT7

COOL_F10

ICOOLLMT6

COOL_F9

ICOOLLMT5

COOL_F8

ICOOLLMT4

COOL_F7

ICOOLLMT3

COOL_F6

ICOOLLMT2

COOL_F5

ICOOLLMT1

If the current frequency is lower than COOL_F4, the frequency will not be limited. After 10s of the compressor start, if the current>ICOOL, the AC will display the failure for 30 seconds and stop. The AC

will restart 3 minutes later.

Heating mode:

Current frequency（Hz）

Current limit value（A）

Frequency limit

HEAT_F16

IHEATLMT12

Decrease the frequency to HEAT_F4 and run at HEAT_F4 for

HEAT_F15

IHEATLMT11

3 minutes.

After that, the frequency will be adjusted according to the capacity demand and rise to the upper level every 3 minutes

(When the frequency>Heat_F4 via capacity demand).

HEAT_F14

IHEATLMT10

HEAT_F13

IHEATLMT9

HEAT_F12

IHEATLMT8

HEAT_F11

IHEATLMT7

HEAT_F10

IHEATLMT6

HEAT_F9

IHEATLMT5

HEAT_F8

IHEATLMT4

HEAT_F7

IHEATLMT3

HEAT_F6

IHEATLMT2

HEAT_F5

IHEATLMT1

If the current frequency is lower than HEAT_F4, the frequency will not be limited. After 10s of the compressor start, if the current>IHEAT, the AC will display the failure for 30 seconds and stop. The AC

will restart 3 minutes later.

9.5.5 Indoor / outdoor units communication protection

If the indoor units can not receive the feedback signal from the outdoor units for 2 minutes, the AC will stop and display the failure.

9.5.6 High condenser coil temp. protection.

When T3>65℃ for 3 seconds, the compressor will stop while the indoor fan and outdoor fan will continue. When T3<52℃, the protection will release and the compressor will restart after 3 minutes.

9.5.7 Outdoor unit anti-freezing protection

For other models: When T2B<0℃ for 250 seconds, the indoor unit capacity demand will be zero and resume to normal when T2B>10℃.

For M2OD-16HFN1-Q，M2OD-18HFN1-Q，M5OD-42HFN1-Q: When T2<4℃ for 250 seconds or T2<0℃, the indoor unit capacity demand will be zero and resume to normal when T2>8℃ and the time of protection is no less than 3 minutes.

9.5.8 Oil return Running rules:

1. If the compressor frequency keeps lower than RET_OIL_FREQ1_ADD for RET_OIL_TIME1_ADD, the

AC will rise the frequency to RET_OIL_FREQ2_ADD for RET_OIL_TIME2_ADD and then resume to former frequency.

2. The EXV will keep 300p while the indoor units will keep the current running mode. If the outdoor ambient is higher than TempT4HeatLimit_ADD during the oil return, the AC quit oil return.

10. Troubleshooting

10.1 Indoor unit error code explanation: PREMIER series +OASIS series+9A series +R series +12F series +Aurora series:

Display

Operation lamp flash times

Timer lamp

Failure

E0 1 X

Indoor EEPROM malfunction

E1 2 X

Indoor / outdoor units communication error

E3 4 X

Indoor fan speed has been out of control

E4 5 X

Open or short circuit of T1 temperature sensor

E5 6 X

Open or short circuit of T2 temperature sensor

F1 2 O

Open or short circuit of T4 temperature sensor

F2 3 O

Open or short circuit of T3 temperature sensor

F3 4 O

Open or short circuit of T5 temperature sensor

F4 5 O

Outdoor EEPROM parameter error

F5 6 O

Outdoor fan speed out of control

F6 7 O

Open or short circuit of T2B temperature sensor

P0

1

☆

IPM module protection

P1

2

☆

Voltage protection

P4 5 ☆

Inverter compressor drive protection

P5

6

☆

Mode conflict

P6

7

☆

Low pressure protection(Just matching with M4OA-36HFN1-Q,M4OD-28HFN1-Q,M5OC-36HF N1-Q, M5OD-42HFN1-Q)

O （light） X （off） ☆ （flash）

Light Commercial series(Except Console)

NO.

MALFUNCTION

RUN

Timer

DEF

Alarm

DISPLAY

DIGITAL TUBE

1

Open or short circuit of T1 temperature sensor

☆

X X X

E0

2

Open or short circuit of T2 temperature sensor

X

X ☆ X

E1

3

Indoor / outdoor units communication error

X ☆ X

X

E2

4

Full-water malfunction

X X X ☆ E3

5

Indoor EEPROM malfunction

☆

X

E4

6

IPM module protection

☆

X X O

E5

7

Open or short circuit of T3 or T4 temperature sensor or Outdoor EEPROM malfunction

☆

O

X X E6 8

Outdoor fan speed has been out of control

☆

O

☆

X

E7

9

Indoor fan speed has been out of control

☆

O

X

F5

10

Voltage protection

☆

O X O

P0

11

Outdoor unit over-current protection

☆ ☆ ☆

X

P2

12

Inverter compressor drive protection

☆

◎

X

P4

13

Mode conflict

☆

X O O

P5

☆ Flash(at 2.5Hz) ◎ Flash(at 0.5Hz) O light X（off）

Note: Digital display is only available for A5 duct type.

For Console

NO.

Malfunction

Running lamp

Timer lamp

Defrosting lamp

1

Open or short circuit of T1 temperature sensor

☆

X

2

Open or short circuit of T2 temperature sensor

X X ☆

3

Communication malfunction between indoor and outdoor units.

X ☆ X

4

Outdoor fan speed has been out of control

X ☆ O

5

Indoor EEPROM malfunction

☆

X

6

IPM module protection

☆ X ☆

7

Open or short circuit of T3 or T4 temperature sensor or Outdoor unit EEPROM parameter error

☆ ☆ ☆

8

Voltage protection

☆ ☆ O

9

Inverter compressor drive protection

☆

◎

X

10

Indoor fan speed has been out of control.

☆ O ☆

11

Mode conflict

☆ X O

O(light) X(off) ☆(flash at 5Hz) ◎(flash at 0.5Hz)

10.2 Outdoor unit error code explanation:

Display

LED STATUS

E0

Outdoor EEPROM malfunction

E2

Indoor / outdoor units communication error

E3

Communication malfunction between IPM board and outdoor main board

E4

Open or short circuit of outdoor unit temperature sensor

E5

Voltage protection

E8

Outdoor fan speed has been out of control

F1

No A Indoor unit coil outlet temperature sensor or connector of sensor is defective

F2

No B Indoor unit coil outlet temperature sensor or connector of sensor is defective

F3

No C Indoor unit coil outlet temperature sensor or connector of sensor is defective

F4

No D Indoor unit coil outlet temperature sensor or connector of sensor is defective

F5

No E Indoor unit coil outlet temperature sensor or connector of sensor is defective

P1

High pressure protection (For M4OA-36HFN1-Q, M4OD-28HFN1-Q, M5OC-36HFN1-Q, M5OD-42HFN1-Q)

P2

Low pressure protection (For M4OA-36HFN1-Q, M4OD-28HFN1-Q, M5OC-36HFN1-Q, M5OD-42HFN1-Q)

P3

Current protection of compressor

P4

Temperature protection of compressor discharge

P5

High temperature protection of condenser

P6

IPM module protection

Note: Once these error codes display, they will disappear in at least 30 seconds if the unit come back to normal.(Except E3&E4)

10.3 Trouble shooting

10.3.1 For the indoor unit

10.3.1.1 Indoor EEPROM malfunction

Yes

Replace the indoor main PCB

Power off, then restart the

unit 2 minutes later

EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.

10.3.1.2 Indoor / outdoor units communication error

Indoor / outdoor units communication error

Start: Power off , then Power on the

A/C by the Breaker. (reconnect the power wire). Is it still displaying the

error code?

Yes

No

Replacee outdoor unit PCB assembly(include

wiring) totally

Check wiring on the outdoor and indoor

terminal follow the wiring diagram. Is all

connecting correctly?

Yes

No

Measure Vs, is it moving

alternately between positive value

and negative value? (Vs is the

voltage between S and N). Refer

PIC 1

Turn on all indoor unit by remote

controller. Is all indoor unit display

Turn off the all indoor units. Is IPM power LED or operating LED lamp

On? Refer PIC2

Yes

A: Is all the wiring between

terminal and Indoor PCB

connect ok?

No

Yes

A

No

Reconnect the wiring

Is indoor units number correct? Check on the outdoor check point . (2 for dual zone, 3 for tri zone, 4 for qua zone,5 for

qui zone). Refer PIC 4.

Yes

No first time

Yes

Replace the Indoor PCB

Power on by remote

controller, IIs it still

displaying the error code

after 3 minutes?

Trouble is solved

No second time

No

Yes

Reconnect the wiring

No

Replace IPM board or the outdoor main PCB

No

Is the reactor connecting

well？

No Reconnect the wiring

Replace the outdoor main PCB

Yes

No

Is main board“ ”

lamp on? Refer PIC 3.

Pic 2:IPM or outdoor main PCB (For M2OD-14HFN1-Q/M2OD-18HFN1-Q (W210) / M4OD-28HFN1-Q/tri-zone)

Self-Check

Power,

Operating

Self-Check

Operating

Pic 2: IPM or outdoor main PCB (For M2OD-16HFN1-Q / M2OD-18HFN1-Q(W190)/M4OA-36H FN1-Q/ qui-zone)

Pic 1: check the voltage of N to S (Vs), is it moving alternately between positive value and negative value?

.

PIC3 :Main board LED when power on and unit standby.

PIC 4: check point button, Press 1 time for check how many indoor units are

connected

10.3.1.3 indoor unit fan speed has been out of control

Power off, then restart the

unit 2 minutes later. Is it still

displaying the error code?

Power off, then restart the

unit 2 minutes later. Is it still

displaying the error code?

Sh u t off t h e powe r supply , rotate the fan by hand. Does it rotate properly?

The unit operates normally.

Find out the cause and

have it solved. For

example, whether the fan

is blocked or the screws

which fix the fan are

tighten.

Find out the cause and

have it solved. For

example, whether the fan

is blocked or the screws

which fix the fan are

tighten.

Check the wiring of fan

motor. Are all the

connections good?

Check the wiring of fan

motor. Are all the

connections good?

No

Yes

No

Correct the connections.

Correct the connections.No

Replace the fan motor

Yes

Replace the main PCB

Replace the main PCBNo

Check whether the main PCB

is normal through index 1?

Check whether the main PCB

is normal through index 1?

Yes

No

Index 1: 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 have problems and need to be replaced.

2. Indoor DC fan motor(control chip is inside fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor

connector. If the value of the voltage is not in the range showing in below table, the PCB must have problems and need to be replaced.

For other models:

For console:

5

4

6

3

2

1

DC motor voltage input and output For split type:

NO.

Color

Signal

Voltage

1

Red

Vs/Vm

280V~380V

2

---

3

Black

GND

0V

4

White

Vcc

14-17.5V

5

Yellow

Vsp

0~5.6V

6

Blue

FG

14-17.5V

For other types:

NO.

Color

Signal

Voltage

1

Red

Vs/Vm

192V~380V

2

---

3

Black

GND

0V

4

White

Vcc

13.5-16.5V

5

Yellow

Vsp

0~6.5V

6

Blue

FG

13.5-16.5V

10.3.1.4 Open or short circuit of temperature sensor.

Check the connections

between temperature

sensor and PCB. Are the

connections good?

Check the connections

between temperature

sensor and PCB. Are the

connections good?

Correct the connections.

Correct the connections.No

Yes

No

Replace the sensor.

Replace the indoor PCB

Measure the resistance value

of the sensor via Appendix 1

Measure the resistance value

of the sensor via Appendix 1

Is it normal?

Yes

10.3.1.6 Full-water malfunction

If the water-level switch

is inserted well?

If the water-level switch

is inserted well?

No

Insert the water-level switch well

If the water-level switch

is broken?

If the water-level switch

is broken?

Yes

Replace the water-level switch

Replace the water pump, If malfunction is still not solved

Yes

No

Yes

Replace the indoor main PCB

Power off, then restart the unit 2 minutes

later. Is it still displaying the error code?

Power off, then restart the unit 2 minutes

later. Is it still displaying the error code?

Yes

10.3.2 For the outdoor unit

10.3.2 1 Outdoor EEPROM malfunction(ODU E0)

Yes

Replace the outdoor main PCB

Power off, then restart the

unit 2 minutes later

Power off, then restart the

unit 2 minutes later

EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.

10.3.2.2 Communication malfunction between IPM board and outdoor main board(ODU E3)

Communication malfunction between

IPM board and outdoor main board

Is there at least one LED in

the IPM board light?

Check the signal wire between

the IPM board and the main board, is it connected good?

Reconnect and retry. Is error still display?

Replace IPM board, and

then check whether the

system can run normally

Replace the electric control

box

No

Yes

Trouble is solved

No

Yes

Replace outdoor main

board, and then check

whether the system can run

normally

No

Yes

E3 display

10.3.2.3 Voltage protection(ODU E5)

Voltage protection

Check the voltage of

outdoor unit power supply,

whether the voltage

between L(L1) and N (L2) is

about 220~240VAC

Check the power supply

Check whether the voltage

of IPM board P and N is

normal? DC277-356V for

18-27KBtu/h; DC277-410V

for 36-42KBtu/h

Replace bridge rectifiers,

and then check whether the

system can run normally

Replace IPM board, and

then check whether the

system can run normally

Replace outdoor main board

Yes

No

Yes

Trouble is solved

Yes

10.3.2.4 Outdoor unit fan speed has been out of control (E8)

Power off, then restart the

unit 2 minutes later. Is it still

displaying the error code?

Power off, then restart the

unit 2 minutes later. Is it still

displaying the error code?

Sh u t off t h e powe r supply , rotate the fan by hand. Does it rotate properly?

The unit operates normally.

Find out the cause and

have it solved. For

example, whether the fan

is blocked or the screws

which fix the fan are

tighten.

Find out the cause and

have it solved. For

example, whether the fan

is blocked or the screws

which fix the fan are

tighten.

Check the wiring of fan

motor. Are all the

connections good?

Check the wiring of fan

motor. Are all the

connections good?

No

Yes

No

Correct the connections.

Correct the connections.No

Replace the fan motor

Yes

Replace the main PCB

Replace the main PCBNo

Check whether the main PCB

is normal through index 1?

Check whether the main PCB

is normal through index 1?

Yes

No

Index 1:

1. Outdoor DC fan motor(control chip is inside fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor

connector. If the value of the voltage is not in the range showing in below table, the PCB must have problems and need to be replaced.

DC motor voltage input and output

NO.

Color

Signal

Voltage

1

Red

Vs/Vm

140V~380V

2

---

--- 3 Black

GND

0V

4

White

Vcc

13.5-16.5V

5

Yellow

Vsp

0~6.5V

6

Blue

FG

15V

10.3.2.5 High pressure protection (ODU P1) (For M4OA-36HFN1-Q, M4OD-28HFN1-Q, M5OC-36HFN1-Q, M5OD-42HFN1-Q)

Whether the wiring

between the high pressure

switch and main control

board is connected well or

correctly

Whether the wiring

between the high pressure

switch and main control

board is connected well or

correctly

Method: Disconnect the plug.

Measure the resistance of the

high pressure protector, if

the protector is normal the

value is o,

Method: Disconnect the plug.

Measure the resistance of the

high pressure protector, if

the protector is normal the

value is o,

Yes

Connect it well

Connect it wellNo

Replace high pressure protector

Replace high pressure protectorNo

Whether the high

pressure protector

is broken

Whether the high

pressure protector

is broken

Check whether the outdoor

ambient temperature is

higher than 50℃

Check whether the outdoor

ambient temperature is

higher than 50℃

No

Stop the unit

Stop the unit Yes

Check if the outdoor unit

ventilation is good

Check if the outdoor unit

ventilation is good

Yes

Make the outdoor unit ventilate well

Check whether the heat

exchanger is dirty

Check whether the heat

exchanger is dirty

No

Clean the heat exchanger

Clean the heat exchangerYes

Check whether the refrigerant

system is ok

Check whether the refrigerant

system is ok

Replace outdoor main

board

Replace outdoor main

board

No

High pressure protection

Check if the outdoor fan runs

properly

Check if the outdoor fan runs

properly

please refer to the solution of fan

speed has been out of control

malfunction . Find out the cause and

have it solved.

please refer to the solution of fan

speed has been out of control

malfunction . Find out the cause and

have it solved.

No

Yes

NO

10.3.2.6 Low pressure protection (ODU P2) (For M4OA-36HFN1-Q, M4OD-28HFN1-Q, M5OC-36HFN1-Q, M5OD-42HFN1-Q)

Low pressure protection

Whether the wiring

between the low pressure protector and main control board is connected well or

correctly

Whether the wiring

between the low pressure

protector and main control board is connected well or

correctly

Method: Disconnect the plug.

Measure the resistance of the

low pressure protector. If the

protector is normal the value is

o

Method: Disconnect the plug. Measure the resistance of the low pressure protector. If the

protector is normal the value is

o

Yes

Connect it well

Replace outdoor main board

No

Replace low pressure protector

No

Whether the low

pressure protector

is broken

Whether the low

pressure protector

is broken

Check whether the outdoor ambient temperature is too

low

Check whether the outdoor

ambient temperature is too

low

No

Stop the unit

Stop the unit Yes

Open fully valve core of

high pressure valve

Open fully valve core of

high pressure valve

No

Check whether valve core

of high pressure valve is

opened

Check whether valve core

of high pressure valve is

opened

Check if the indoor fan runs

properly in cooling mode

Check if the indoor fan runs

properly in cooling mode

please refer to the solution of fan

speed has been out of control

malfunction. Find out the cause and

have it solved.

please refer to the solution of fan

speed has been out of control

malfunction. Find out the cause and

have it solved.

No

Yes

No

Check whether the refrigerant

system is ok

Check whether the refrigerant

system is ok

Refrigerant is not enough add the

refrigerant

Refrigerant is not enough add the

refrigerant

No

10.3.2.7 Current protection of compressor (ODU P3)

Current protection of compressor

Judge 1: Check whether the

input current of the power

supply wire is higher than max

protection current value

Yes

Replace the electric control box

Check whether

the refrigerant

system is ok

Judge 2: Check whether the

outdoor ambient

temperature is higher than

50℃

No

Stop the unitYes

Judge 3: Check whether the

outdoor unit is bad ventilation

No

Make the outdoor unit ventilate wellYes

Judge 5: The refrigerant

pipe is blocked

No

Let the refrigerant out, then use the high

pressure nitrogen or refrigerant to blow pipe,

vacuumize and charge the refrigerant again

Yes

Judge 4: Check whether the

heat exchanger is dirty

No

Clean the heat exchanger

Yes

Replace outdoor main

board,and check whether

the system can run normally

No

Yes

Trouble is solved

Model

M2OD-16H FN1-Q

M2OD-18HFN1

-Q(W190)

M2OD-18H FN1-Q

M2OD-14H FN1-Q

M3OD-21H FN1-Q

M3OD-26H FN1-Q

M3OD-27H FN1-Q

M4OD-28H FN1-Q

M4OA-36H FN1-Q

M5OC-36H FN1-Q

M5OD-42H FN1-Q

Max prote ction curre nt

11A

14A

15A

14A

15A

18.5A

18A

23A

25A

10.3.2.8 Temperature protection of compressor discharge (ODU P4)

Temperature protection of

compressor discharge

Temperature protection of

compressor discharge

Check whether the

compressor discharge temp. is

more than 115°C ?

Check whether the

compressor discharge temp. is

more than 115°C ?

Check whether the connection is right between compressor discharge temp. sensor and PCB according to wiring diagrams?

Measure the resistance value

of compressor discharge

temp. sensor. If the value is

not normal is normal refer to

the Appendix 2?

Measure the resistance value

of compressor discharge

temp. sensor. If the value is

not normal is normal refer to

the Appendix 2?

No

Yes

No

Correct the wiring connection

Stop leaking and add refrigerant

Replace the compressor discharge temp. sensor

No

Yes

Replace high pressure valve assy

Yes

No

Replace outdoor main PCB

No

Check whether the

refrigerant is leak

Check whether the

refrigerant is leak

10.3.2.9 High temperature protection of condenser (ODU P5) When outdoor pipe temperature is more than 65°C, the unit will stop, and unit runs again when outdoor pipe

temperature less than 52°C.

High temperature protection of

condenser

High temperature protection of

condenser

Check whether the

condenser temperature is

Higher than 65°C

Check whether the

condenser temperature is

Higher than 65°C

Yes

Check whether the

resistance of condenser

temp. sensor is normal

refer to the Appendix 1

Check whether the

resistance of condenser

temp. sensor is normal

refer to the Appendix 1

Replace the temperature sensor

No

Check whether the outdoor

ambient temperature is

higher than 50℃

Check whether the outdoor

ambient temperature is

higher than 50℃

No

Stop the unit

Stop the unit Yes

Check if the outdoor unit

ventilation is good

Check if the outdoor unit

ventilation is good

Yes

Make the outdoor unit ventilate well

Check whether the heat

exchanger is dirty

Check whether the heat

exchanger is dirty

No

Clean the heat exchanger

Clean the heat exchangerYes

Check whether the refrigerant

system is ok

Check whether the refrigerant

system is ok

Replace outdoor main

board

Replace outdoor main

board

No

Refrigerant is not enough add the

refrigerant

Refrigerant is not enough add the

refrigerant

No

Check if the outdoor fan runs

properly

Check if the outdoor fan runs

properly

please refer to the solution of fan

speed has been out of control

malfunction . Find out the cause and

have it solved.

please refer to the solution of fan

speed has been out of control

malfunction . Find out the cause and

have it solved.

No

Yes

No

Correct the connection

Correct the connectionNo

Yes

Check the connection

between temperature

sensor and PCB.

Check the connection

between temperature

sensor and PCB.

Yes

10.3.2.10 IPM module protection (ODU P6)

IPM module protection

Check whether the voltage range of P-N on IPM module is normal?

DC277-356V for 18-27KBtu/h;

DC277-410V for 36-42KBtu/h

Yes

No

Yes

Check whether the input power supply is correct?

208-230V, 1N, 60Hz

No No

Regulate it to correct, then

check whether the system

can work normally?

Check whether the

power supply line is

connected correctly and

tightly

Yes

Connect it correctly and tightly, check ok

or not?

No

Check whether the connecting

line between main board and the IPM module is connected

tightly

Yes

Connect it tightly,

check ok or not?

No

Connect it well, check

ok or not?

Check whether the connecting

line of the compressor is

connected correctly or tightly

Replace the IPM module,

check whether the system can

work normally?

No

Replace the main board; check

whether the system can work

normally?

No

Replace the compressor, check

whether the system can work

normally?

Check whether the lines

in E-part box are

connected tightly

Yes

Connect it tightly,

check ok or not?

No

Yes

No

Replace the bridge rectifiers

Check whether the bridge rectifiers are

normal? Use the multimeter to measure

the resistance between each two terminals, check whether there is the condition that value of resistance is 0

Check whether the connecting line of every reactor is normal? If the line is broken, the resistance of the two ports is ∞（models except for M4OA-36HFN1- Q,M4OD-28HFN1-Q, M5OC-36HFN1Q）；Check whether the PFC module broken (for M4OA-36HFN1-Q,M4OD28HFN1-Q, M5OC-36HFN1-Q,M50D42HFN1-Q)

Replace the connecting line or

reactor or replace the PFC

module(for M4OC-36HRFN1-

M,M50D-42HFN1-Q)

Yes

No

Yes

Trouble is solved

Check if the outdoor fan

runs properly or the outdoor

unit ventilation is good.

No

Check whether the resistance of the fan motor is normal. If not, replace the fan motor. For other

models, refer to the solution of

fan speed has been out of control malfunction . F in d ou t the cause and have it solved.

Yes

10.4 Main parts check

Spec.

Indoor unit

Model

7K 11M

9K 11M

12K 11M

18K 11M

Indoor fan motor

WZDK20-38G

WZDK58-38G

Model

9K 11P

12K 11P

18K 11P

Indoor fan motor

WZDK20-38G

Model

7K 9A

9K 9A

12K 9A

18K(RC8) 9A

18K(RC4) 9A

Indoor fan motor

WZDK20-38G

RPG20D

WZDK30-38G

RPG28D

Model

7K 12F

9K 12F

12K 12F

18K 12F

Indoor fan motor

RPG20E

WZDK20-38G

WZDK30-38G

Model

7K R

9K R

12K R

18K R

Indoor fan motor

RPG13H

RPG20E

RPG25

Model

7K A5

9K A5

12K A5

18K A5

Indoor fan motor

WZDK27-38GS

YSK68-4P

Model

7K Cassette

9K Cassette

12K Cassette

18K Cassette

Indoor fan motor

WZDK37-38G

YDK37-4P

Model

9K Console

12K Console

18K Console

Indoor fan motor

RD-280-20-8A

Outdoor unit

Model

1x2(14k)

1x2(18k)

1x3(27K)

1x3(21K)

Compressor

DA130M1C-31FZ

DA150S1C-20FZ

DA250S2C-30MT

DA150S1C-20FZ

Outdoor fan motor

WZDK50-38G

WZDK72-38G

WZDK50-38G

Model

1x4(28K)

1x4(36K)

1x5(36K)

1x5(42K)

Compressor

DA250S2C-30MT

TNB306FPGMC-L

MNB36FAAMC-L

Outdoor fan motor

WZDK72-38G

WZDK180-38G

Model

1x2(16k)

1x2(18k,W190)

Compressor

ASN108D22UEZ

DA130M1C-31FZ

Outdoor fan motor

WZDK40-38G-W-1

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.

Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4,T2B (℃--K)

℃

K Ohm

℃

K Ohm

℃

K Ohm

℃

K Ohm

-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

Appendix 2 Temperature Sensor Resistance Value Table for T5 (℃--K)

℃

K Ohm

℃

K Ohm

℃

K Ohm

℃

K Ohm

-20

542.7

20

68.66

60

13.59

100

3.702

-19

511.9

21

65.62

61

13.11

101

3.595

-18

483

22

62.73

62

12.65

102

3.492

-17

455.9

23

59.98

63

12.21

103

3.392

-16

430.5

24

57.37

64

11.79

104

3.296

-15

406.7

25

54.89

65

11.38

105

3.203

-14

384.3

26

52.53

66

10.99

106

3.113

-13

363.3

27

50.28

67

10.61

107

3.025

-12

343.6

28

48.14

68

10.25

108

2.941

-11

325.1

29

46.11

69

9.902

109

2.86

-10

307.7

30

44.17

70

9.569

110

2.781

-9

291.3

31

42.33

71

9.248

111

2.704

-8

275.9

32

40.57

72

8.94

112

2.63

-7

261.4

33

38.89

73

8.643

113

2.559

-6

247.8

34

37.3

74

8.358

114

2.489

-5

234.9

35

35.78

75

8.084

115

2.422

-4

222.8

36

34.32

76

7.82

116

2.357

-3

211.4

37

32.94

77

7.566

117

2.294

-2

200.7

38

31.62

78

7.321

118

2.233

-1

190.5

39

30.36

79

7.086

119

2.174

0

180.9

40

29.15

80

6.859

120

2.117

1

171.9

41

28

81

6.641

121

2.061

2

163.3

42

26.9

82

6.43

122

2.007

3

155.2

43

25.86

83

6.228

123

1.955

4

147.6

44

24.85

84

6.033

124

1.905

5

140.4

45

23.89

85

5.844

125

1.856

6

133.5

46

22.89

86

5.663

126

1.808

7

127.1

47

22.1

87

5.488

127

1.762

8

121

48

21.26

88

5.32

128

1.717

9

115.2

49

20.46

89

5.157

129

1.674

10

109.8

50

19.69

90 5 130

1.632

11

104.6

51

18.96

91

4.849

12

99.69

52

18.26

92

4.703

13

95.05

53

17.58

93

4.562

14

90.66

54

16.94

94

4.426

15

86.49

55

16.32

95

4.294

B(25/50)=3950K

16

82.54

56

15.73

96

4.167

17

78.79

57

15.16

97

4.045

R(90℃)=5KΩ±3%

18

75.24

58

14.62

98

3.927

19

71.86

59

14.09

99

3.812

2.Compressor checking

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

Position

Resistance Value

DA130M1C-31FZ

DA150S1C-20FZ

DA250S2C-30MT

TNB306FPGMC-L

ASN108D22UEZ

MNB36FAAMC-L

Blue -

Red

1.77Ω(20℃)

0.95Ω(20℃)

0.55Ω(20℃)

0.53Ω(20℃)

1.57Ω(20℃)

0.44Ω(20℃)

3. IPM continuity check

Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N.

Digital tester

Normal resistance value

Digital tester

Normal resistance value

(+)Red

(-)Black

∞

(Several MΩ)

(+)Red

(-)Black

∞

(Several MΩ)

P

N

U

N

U V V W W

(+)Red

4: Indoor AC Fan Motor

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

Posi

tion

Resistance Value

RPG20D(

Weilng)

RPG28D(T

ongDe)

RPG28D(

Dayang)

RPG20E(T

ongDe)

RPG20E(

Weilng)

RPG13H(

Weilng)

RPG25(T

ongDe)

YSK68-4P(

Weilng)

YDK37

-4P

Blac

k -

Red

398Ω±8%

(20℃)

255Ω±8%

(20℃)

271.3Ω±8 % (20℃)

415Ω±8%

(20℃)

387Ω±8%

(20℃)

575Ω±8%

(20℃)

295Ω±8%

(20℃)

285.8Ω±8

% (20℃)

258.7

Ω±8% (20℃)

Red -

Yello

w

345Ω±8%

(20℃)

335Ω±8%

(20℃)

347.8Ω±8 % (20℃)

396Ω±8%

(20℃)

378Ω±8%

(20℃)

558Ω±8%

(20℃)

420Ω±8%

(20℃)

178.5Ω±8

% (20℃)

189.7

Ω±8% (20℃)

Yello

w -

Blue

345Ω±8%

(20℃)

335Ω±8%

(20℃)

347.8Ω±8 % (20℃)

396Ω±8%

(20℃)

378Ω±8%

(20℃)

558Ω±8%

(20℃)

420Ω±8%

(20℃)

178.5Ω±8

% (20℃)

189.7

Ω±8% (20℃)