Midea M2OC-18HRDN1-M, M3OC-27HRDN1-M, M4OC-36HRDN1-M Service Manual

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ODMI-A-1110

SERVICE MANUAL

MIDEA AIRCONDITIONER

North America MARKET

DC INVERTER MULTI TYPE

M2OC-18HRDN1-M M3OC-27HRDN1-M M4OC-36HRDN1-M

DC MULTI OUTDOOR UNITS

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ODMI-A-1110

CONTENTS

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

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

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

4. Wiri ng Diagram ...................................................................................... 6

5. Refrigeration Cycle Diagram ................................................................ 8

6. I ndoor units combination .................................................................... 10

7. I nstallation De tails ............................................................................... 11

8. Electronic control function ................................................................. 20

9. Troubleshooting .................................................................................. 25

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ODMI-A-1110

1. General information of Outdoor Unit s

Model name Dimension (mm(in)) Compressor

M2OC-18HRDN1-M 845x320x700(33.3x12.6x27.6) DA130S1C-20FZ M3OC-27HRDN1-M 845x320x700(33.3x12.6x27.6) DA150S1C-20FZ M4OC-36HRDN1-M 990x345x965(39x13.6x38) TNB306FPGMC-L

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ODMI-A-1110

2．Features

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

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

It protects the valves and prevents water from dripping.

Outdoor unit

Power relay control

Hydrophilic aluminum fin

Anti-rust cabinet

Valve protection cover

4 way valve control

Low noise air flow system

Discharge pipe temperature protection

Compressor crankcase heater

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ODMI-A-1110

3. Dimensions

mm(in)

Model W D H W1 A B

M2OC-18HRDN1-M

845((33.3) 320(12.6) 700(27.6) 908(35.7) 560(22) 335(13.2)

M3OC-27HRDN1-M M4OC-36HRDN1-M 990(39) 345(13.6) 965(38) 1075(42.3) 624(24.6) 366(14.4)

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ODMI-A-1110

4. Wiring Diagram

4.1 M2OC-18HRDN1-M

4.2 M3OC-27HRDN1-M

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ODMI-A-1110

4.3 M4OC-36HRDN1-M

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ODMI-A-1110

5. Refrigeration Cycle Diagram

8.1 Refrigeration circuit drawing of inverter dual zone

5.2 Refrigeration circuit drawing of inverter tri-zone

8.3 Refrigeration circuit drawing of inve r t e r qua-zone

Liquid valve A

Gas valve C

EXV C

way

valve

Compressor

Condenser

Axial flow fan

EXV B

EXV A

Gas valve A

Gas valve B

Liquid valve C

Liquid valve B

Evaporator

Cross

flow fan

Indoor Unit

Capillary A

Capillary B

Capillary C

Filter A

Filter B

Filter C

Main

Capillary

Auxiliary

Capillary

Check

Valve

Exhaust

temp. sensor

Indoor pipe out

temp.

sens

or B

Indoor pipe out

temp. sen

sor A

Indoor pipe out

temp. sen

or C

Outdoor Unit

Coil temp.

sensor

Indoor Unit

Cross flow fan

Evaporator

Liquid valve A

Liquid valve B

Gas valve B

Gas valve A

EXVA

EXVB

Axial flow fan

Condenser

Compressor

way

valve

Auxiliary

Capillary

Capillary A

Capillary B

Exhaust

temp. sensor

Indoor pipe out

temp. sen

or A

Indoor pipe out

temp. sen

or B

Filter A

Filter B

Outdoor Unit

Main

Capillary

Check

Valve

Coil temp.

sensor

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ODMI-A-1110

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ODMI-A-1110

6. Indoor units combination

6.1 Indoor unit combination for M2OC-18HRDN1-M

Comb.

Combinations

Unit A

Unit B

Dual(1x1)

—

12k — 18k

—

Dual (1x2)

12k

6.2 Indoor unit combination for M3OC-27HRDN1-M

Comb.

Combinations

Unit A

Unit B

Unit C

TRI (1x1)

—

12k

—

18k

—

TRI (1x2)

—

12k

—

18k

—

12k

—

12k

18k

—

TRI (1x3)

12k

6.3 Indoor unit combination for M4OC-36HRDN1-M

Comb.

Combinations

Unit A

Unit B

Unit C

Unit D

QUA (1x1)

— — —

12k

— — —

18k

— — —

QUA (1x2)

—

12k

—

18k

—

12k

—

12k

18k

—

18k

—

QUA (1x3)

—

12k

—

18k

—

12k

—

12k

18k

—

18k

—

12k

12k — 12k

12k

18k

—

12k

18k

—

QUA(1x4)

12k

18k

12k

18k

12k

18k

12k

18k

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ODMI-A-1110

7. Installation Details

7.1 Wrench torque sheet for installation

Outside diameter Torque Additional tightening torque

mm inch N.cm N.cm $6.35 1/4 1500(153kgf.cm) 1600(163kgf.cm) $9.52 3/8 2500(255kgf.cm) 2600(265kgf.cm) $12.7 1/2 3500(357kgf.cm) 3600(367kgf.cm)

7.2 Connecting the cables

The power cord of connect s houl d be selected according to the follow ing specifications sheet.

For power line:

Unit AWG

dual-zone(18K outdoor unit) 14

tri-zone (27K outdoor unit). 14 qua-zone(36K outdoor unit) 12

For indoor unit and outdoor unit connection line, 16AWG is ok for all.

7.3 Pipe length and the elevation

Unit

Pipe size

Standard

length

(m)

Max.

Elevation

B (m)

Max.

Length

A (m)

Additional refrigerant

(g/m)

Gas Liquid

9K 3/8•• ($9.53) 1/4•• ($6.35)

(16.4ft)

(26.2ft)

(65.6ft)

(0.212 ozs/ft)

12K/18K 1/2•• ($12.7) 1/4•• ($6.35)

Caution:

Capacity test is based o n standard length and maxi mu m allowance length is based on rel iability. Oil trap should be install ed per 3-5 meters.

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ODMI-A-1110

7.4 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 drop s.

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

● Water may lead to corrosion of par ts in the refrigerant syst em.

Therefore, the indoor units and t he pipes between i ndoor and out d oor unit s m ust be lea k tested and

evacuated to remove gas and mo ist ur e 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 pur ging with vacuum pum p

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 w it h t he push pin of handle lo to the 3-way valves gas service port..

3) Connect the charge hose of ha ndle hi connection to the vacuu m pu mp.

4) Fully open the handle Lo of the ma ni fold valve.

5) Operate the vacuum pum p t o 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 sh oul d be pumped 20 minutes more. If

the pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage

(Indoor unit)

(Liquid side)

(Gas side)

Vacuum

pump

Vacuum

pump

Handle Hi

Two

-way valve

Manifold valve

Compound meter

Pressure

gauge

20Pa

Handle Lo

Charge hose

(Outdoor unit)

Three-way valve

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ODMI-A-1110

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, and 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 purgi ng by 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 char ging cylinder to the service port of the 3-way valve.

3). Air purging. Open the valves on the charging cylinder and the charge set. Purg e t he air by loosening the flare nut on the 2-way valve approximately 45’ for 3 second s t hen 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 refr igerant by loosening the flare nut on t he

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ODMI-A-1110

2-way valve approximatel y 45’ until the gauge indi cates 0.3 to 0.5 Mpa.

6). Disconnect the charge set and t h e char ging cy lin der, and set the 2-way and 3-way valv es to the ope n 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 t ighten the service port cap to a torque 18 N·m. Be sure to check the gas leakage.

3. Adding the refrigerant if the pipe lengt h >5m

Procedure:

1). Connect the charge hose to t he c har ging 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 R410 A, m ake the cylinder bottom up to ensur e the liquid charge.

2). Purge the air from the charge h ose. Open the valve at the bott om of th e cylinder and pr es s the ch eck v alve on th e charge set to pur ge t he 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 t he c ool ing 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), disconnec t t he char ge hose

Electronic scale

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ODMI-A-1110

from the 3-way valve’ s ser vice 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 o f 18 N.m. Be sure to check for gas lea kage.

7.5 Adding the refrigerant after running the system for many years

Procedure:

1). Connect the charge hose to t he 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 h ose. Open the valve at the bott om of th e cylinder and pr es s the ch eck v alve on th e charge set to pur ge t he air

(be careful of the liquid refrigerant).

3) Put the charging cylinder onto the electronic scale and record t he w eight.

4) Operate the air conditioner at t he c ool ing mode.

5) Open the valves (Low side) on the charge set and charge the sy st em 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 discon nec t in g the hose.

Electronic scale

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ODMI-A-1110

7). Mount the valve stem caps and the service port Use torque wrench to tight en t he ser vice port cap to a torque of 18N. m. Be sure to check for gas lea kage.

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

1. Collecting the refrigerant into the outdoor unit

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 st ems are in the opened position. Be sure to use a hexagonal wr ench t o 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 ma ni fold 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 conditi oner at t he cooling cycle and stop it when the gaug e 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.

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ODMI-A-1110

Use a torque wrench to tight en t he 3-way valves service port cap to a t or que of 1.8 kgf.m. Be sure to check for gas leakage.

2. Air purgi ng 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 char ging cylinder to the service port of t he 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. Purg e t he air by loosening the flare nut on the 2-way valve approximately 45’ for 3 second s t hen closing it for 1 minute; repeat 3 ti me s. 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 t he 2-way valve approximatel y 45’ until the gauge indi cates 0.3 to 0.5 Mpa.

6). Disconnect the charge set and t h e char ging cy lin der, and set the 2-way and 3-way valv es to the ope n position

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ODMI-A-1110

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 t ighten the service port cap to a torque 18 N.m.

Be sure to check the gas leakage.

7.7 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 t o 3-way valve’s service port.

3). Evacuation for approxi mately 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 t he gauge needle does not move (appr oximately 5 minutes afte r t ur ning off the vacuum pump).

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

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ODMI-A-1110

2. Refrigerant charging

Procedure:

1). Connect the charge hose to t he c har ging cylinder; open the 2-w ay 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 R410 A, m ake the cylinder bottom up to ensur e liquid charge.

2). Purge the air from the charge hose Open the valve at the bott om of th e cylinder and pr es s the ch eck v alve on th e charge set to pur ge t he air

(be careful of the liquid refrigerant).

3) Put the charging cylinder onto the electronic scale and record t he w eight.

4). Open the valves (Low side) o n t he charge set and charge the syst em with liquid refrigerant If the system cannot be char ge w ith the specified amount of refrigerant, or can be charged with a litt le at a time (approximately 150g each time) , operating the air conditioner in the cooling cycle; how ever, one time is not sufficient, w ait approximately 1 minute and then r epeat 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 cap s and the service port Use torque wrench to tight en t he ser vice port cap to a torque of 18N. m. Be sure to check for gas leaka ge

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8. Electronic control function

8.1 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 out door heat exchanger T4: Outdoor ambient temperature T5: Compressor discharge temperature Ts: Set t ing temp.

8.2 Electric control working environment.

8.2.1 Input voltage: 230V.

8.2.2 Input power frequency:60Hz.

8.2.3 Indoor fan normal working a mp. is less than 1A.

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

8.2.5 Four-way valve normal wor king amp. is less than 1A.

8.2.6 Swing motor: DC12V.

8.3 Outdoor unit’s digital display tube

There is a digital display t ube i n outdoor PCB. Digital display tube display function

• In standby , the LED displays “- -”

• In compressor operation, the LED display t he r unning frequency,

• In defrosting mode, The LED displays “dF” or alternative displays between running frequency and

“dF”(each displays 2s)

• In compressor pre-heating, The LED displays “- -”

• In protection or malfunction, the LED displ ays error code or protection code.

8.4 Outdoor unit point check function

There is a check switch in outdoor PCB. Push the switch SW1 to check the st ates of un it when the unit is running. The digita l displ ay t ube will display

the follow procedure when push SW1 each time.

Display

Remark

Indoor unit capacity demand code

2 Outdoor unit running mode code

Off:0, Cooling:1, Heating:2

Amendatory capacity demand code

4 Outdoor unit fan motor state

Off:0, Low speed:1, High speed:2

Evaporator outlet temp. for 1# indoor unit

Actual data

Evaporator outlet temp. for 2# indoor unit

Actual data

Evaporator outlet temp. for 3# indoor unit

Actual data

Evaporator outlet temp. for 4# indoor unit

Actual data

Condenser pipe temp.

Actual data

Ambient temp.

Actual data

Compressor discharge temp.

Actual data

Inverter current

Actual data

EXV open angle for 1# indoor unit

Actual data divide 8

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EXV open angle for 2# indoor unit

Actual data divide 8

EXV open angle for 3# indoor unit

Actual data divide 8

EXV open angle for 4# indoor unit

Actual data divide 8

Power supply of outdoor unit AD data

Indoor unit number

The indoor unit can communicate with outdoor unit well.

The last error or protection code

00 means no malfunction

frequency value

Actual data

Ambient temp. of 1# indoor unit

Actual data

Condenser pipe temp. of 1# indoor unit

Actual data

Ambient temp. of 2# indoor unit

Actual data

Condenser pipe temp. of 2# indoor unit

Actual data

Ambient temp. of 3# indoor unit

Actual data

Condenser pipe temp. of 3# indoor unit

Actual data

Ambient temp. of 4# indoor unit

Actual data

Condenser pipe temp. of 4# indoor unit

Actual data

••

Check point over

The following items from 6.4.1 to 6.4.6 are for the explanation of the point check functions.

8.4.1 Frequency of compressor : Display Frequency of compressor (Hz) 30 30

-- Stand by 60 60

8.4.2 Running mode: Display Corresponding mode 0 Off 1 Cooling mode 2 Heating mode

8.4.3 Capacity demand:

Cooling mode Capacity 2000-2

500

2000-2 500

3000-3 800

4500-5 000

5000-5 500

5500-6 100

6100-7 000

7000-7 500

7500-8 000

>7500

Correspondi ng Code

1 2 3 4 5 6 7 8 9 >=10

Heating mode Capacity 2000-2

500

2000-2 500

3000-3 800

4500-5 000

5500-6 100

6100-7 000

7000-7 500

7500-8 000

>8000

Correspondin g Code

1 2 3 4 5 6 7 8 9-10 >=11

Note: The capacity is just for ref er enc e.

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8.4.4Number of indoor unit

Display Number of indoor unit 1 1 2 2 3 3

8.4.5 Outdoor ambient t emp:

Display Corresponding temp. Display

Corresponding

temp.

Display

Corresponding

temp. 15 -7.5 50 10 80 25 16 -7 51 10.5 81 25.5 17 -6.5 52 11 82 26 18 -6 53 11.5 83 26.5 19 -5.5 53 11.5 84 27 20 -5 54 12 85 27.5 21 -4.5 55 12.5 86 28 22 -4 56 13 87 28.5 23 -3.5 57 13.5 88 29 24 -3 58 14 89 29.5 26 -2 59 14.5 90 30 27 -1.5 60 15 91 30.5 28 -1 61 15.5 92 31 29 -0.5 62 16 93 31.5 30 0 63 16.5 93 31.5 31 0.5 63 16.5 94 32 32 1 64 17 95 32.5 33 1.5 65 17.5 96 33 34 2 65 17.5 97 33.5 35 2.5 66 18 98 34 36 3 67 18.5 99 34.5 37 3.5 68 19

10.

35~40

38 4 69 19.5

11.

40~45

39 4.5 70 20

12.

45~50

40 5 71 20.5

13.

50~55

41 5.5 72 21

14.

55~60

42 6 73 21.5

15.

60~65

43 6.5 74 22

16.

65~70 44 7 75 22.5 45 7.5 75 22.5 46 8 76 23 47 8.5 77 23.5 48 9 78 24 49 9.5 79 24.5

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8.4.6 Opening degree of electronic ex pansion valve: Actual opening degree equals the display data divided 8

8.5 Protection

8.5.1 Three minutes delay at restart for compressor.

8.5.2 T emperature prot ection of compressor discharge.

When the compressor discharge te mp. 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 co mpressor will stop and restar t t ill T5<90℃.

8.5.3 Low voltage protection

VOLLIMT1

VOLTAGE

No limit

VOLLIMT2

VOLLIMT3

Off

VOLFRE2

VOLFRE1

VOLREL1

VOLREL2

VOLREL3

Model VOLLIMT1 VOLLIMT2 VOLLIMT3 VOLREL1 VOLREL2 VOLREL3 VOLFRE1 VOLFRE2

M2OC-18HRDN1-M 230 200 120 260 210 135 62 54 M3OC-27HRDN1-M 245 220 120 265 240 135 78 45 M4OC-36HRDN1-M 200 185 120 210 195 135 54 42

Note: if the low voltage protection occurs and not resumes within 3min, it will keep the protection always after restart t he mac hi ne.

8.5.4 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_F10 ICOOLLMT6

Decrease the frequenc

y 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_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_F12 IHEATLMT8 Decrease the frequency to HEAT_F4 and run at HEAT_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

HEAT_F11 IHEATLMT7 HEAT_F10 IHEATLMT6 HEAT_F9 IHEATLMT5 HEAT_F8 IHEATLMT4

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HEAT_F7 IHEATLMT3

(When the frequency>Heat_F4 via capacity demand).

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 t he failure for 30 seconds and stop. The AC will restart 3 minutes later.

8.5.5 Indoor / out door units c om munication 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.

8.5.6 High condenser coil temp. protection.

When T3>65℃ for 3 seconds, the compressor will stop while the indoor fan and outd oor f an will continue. When T3<52 ℃, the protection w ill relea se and the compressor will restart after 3 minutes.

8.5.7 Outdoor unit anti -freezing protection

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

8.5.8 Oil return Running rules :

1. If the compressor frequency keeps lower than RECOILINFRE for 2hours,the AC will rise the frequency to RECOILFRE for 3mins and then resume to former frequenc y.

Model

RECOILINFRE

M2OC-18HRDN1-M 45 M3OC-27HRDN1-M 45 M4OC-36HRDN1-M 40

2. During the oil return process, the EXV and indoor units keep the current running mode, the frequency will not be limited by the compressor discharge temp. and t he cur r ent .

8.5.9 Compressor pre heating functions

----Preheating permitting c ondition:

If T4(outdoor ambient temperature)＜3 ℃ and newly powered on or if T4＜3 ℃

and co

for over 3 hours, the compr essor heating cable will work.

----Preheating mode:

A weak current flow through the coil of compressor from the wiring terminal of compressor, then the compressor is heated without operation.

----Preheating release condition:

If T4＞5 ℃ o r the compressor starts running, preheating function will stop.

8.5.10 Compressor crankcase heater

When T4<3℃ and the compressor is not runnin g, the crankcase heater will be ac t iv e. When T4≧5℃ or the compressor starts up, the cr ankcase heater will stop work.

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9. Troubleshooting

9.1 Indoor unit error code explanation:

Vertu series & 9A series:

Display LED STATUS

E0 EEPROM parameter error E1 Communication malfunction between indoor and outdoor units E2 Zero-crossing signal error E3 Indoor fan speed out of control

Open or short circuit of outdoor temperat ure sensor

Open or short circuit of room or evaporator coil temperature sensor

P0 Inverter module protection P1 Over voltage or too low voltage protection P2 Tempe rat ure protection of compressor top. P3 Outdoor temp. too low protection P4 Inverter compressor drive error

9.2 Outdoor unit error code explanation:

Display LED STATUS

E0 EEPROM parameter error E1 No 1 Indoor units pipe temp. sensor or conne ctor of pipe te mp . sens or is defective E2 No 2 Indoor units pipe temp. sensor or conne ctor of pipe te mp . sens or is defective E3 No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective E6 No 4 Indoor units pipe temp. sensor or conne ctor of pipe te mp . sens or is defective E4 Open or short circuit of outdoor te mp erat ure sensor E5 Compressor volt protection E7 Communication error between outdoor IC and DSP P0 Temperature protection of compressor top. P1 High pressure protection (just for 36K 1x4 units.) P2 Low pressure protection (just for 36K 1x4 units.) P3 Compressor current protection P4 Inverter module protection P5 Outdoor temp. too low protection P6 Condenser high-temper atu re protection P7 Compressor driving protection

PF PFC protection ( jus t for 36K 1x 4 units.)

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9.3 Trouble shooting

9.3.1 Indoor unit trouble shooting

Indoor unit display LED STATUS

E0 EEPROM parameter error

Shut off the power supply and turn on it 1 minute later

The problem comes out again

Is the EEPROM chip plugged in indoor PCB

Correct the connection

Replace the main PCB of indoor unit

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Indoor unit display LED STATUS

E1 Communication malfunction between indoor and outdoor units

Yes

The unit does not work normally

Check the wiring between indoor and outdoor

unit. Is the connection of L, N, S and G N D good?

Is the LED4(red) bright and LED1(yellow) blinking on outdoor P C B?

The power supply for outd oor PCB is fail.

Check the wiring on outdoor PCB comparing with wiring plate. Is the

connection good?

The unit does not work normally

Turn off the power supply, after 1 minute, connect the power supply, turn on the unit with remote controller

Replace indoor PCB and repower

Replace outdoor e-box.

Correct the connection

Reconnect and retest

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Indoor unit display LED STATUS

E2 Zero-crossing signal error

Indoor unit display LED STATUS

E3 Indoor fan speed out of control

Indoor unit display LED STATUS

E5 Open or short circuit of outdoor temperature sensor

Is the outdoor temperature

sensor connector and

Repair the connector and

Replace the sensor and

check if E5 display again?

YES

Replace outdoor e-box

YES

Is the indoor fan motor connector and connection

good?

Repair the connector and

Is voltage being applied to the fan motor?

(rang 90v-160v between mid pin and N on CN1

YES

Indoor PCB is defective.

YES

Replace the indoor fan

Is power supply and

connection of connectors

Indoor PCB is defective. Replace

the indoor PCB.

Be sure the power supply is good

and correct the connection

YES

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Indoor unit display LED STATUS

E6 Open or short circuit of room or evaporator coil temperature sensor

Indoor unit display LED STATUS

P0 Inverter module protection

Indoor unit display LED STATUS

P1 Over voltage or too low voltage protection

Is the power supply good?

Be sure the power supply is

YES

Replace the outdoor e-box.

Is the indoor temperature

and evaporator sensor

connector and connection good?

Repair the connector and

reconnect

Replace the sensor and

check if E6 display again?

YES

Replace the.indoor PCB

YES

Yes

Check the connectors in outdoor PCBs。Is connection to connector

good?

Is the wires to compr essor right

Check the outdoor inverter module。

Is it breakdown between

P-N,P-U,P-V; P-W;N-W,N-U,N-V At inverter module Normally, P-N: ~1.0MΏ, P-U: ~2.0MΏ

P-V: ~2.0MΏ, P-V: ~2.0MΏ; N-W: ~1.0MΏ

Check compressor Check the resistance between the terminal U, V, W with multimeter, if Ruv=Ruw=Rwv, it is

OK. Otherwise, to replace the compressor.

Inverter module is defective,

Repair connector

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Indoor unit displ a y LED STATUS

P2 Temperature protection of compressor top.

Indoor unit displ a y LED STATUS

P3 Outdoor temp. too low protection

The trouble shooting is same with one of outdoor unit P3 protection.

Indoor unit displ a y LED STATUS

P4 Inverter compressor drive error

Yes

Replace the outdoor PCB

Replace inverter compressor.

Reconnect and retry

Is the connection of compressor good? Is the wiring sequence r ight? The v oltag e range proper?

Yes

No, Charge refrigerant

Is the abnormality the same after gas charging?

Replace the outdoor PCB.

Yes

Is protector normal?

Is the connection good?

Is refrigerant circulation

volume normal?

Reconnect it

Does the compressor operate?

Replace it

There is block

(Such as capillary or

welded points of the pipes.)

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9.3.2 Outdoor unit trouble shooting

Outdoor unit displ ay LED STATUS

E0 EEPROM parameter error

Outdoor unit di splay LED STATUS

No 1 Indoor units pipe temp. sensor or connector of pipe temp. sensor is

defective

Outdoor unit displ ay LED STATUS

No 2 Indoor units pipe temp. sensor or connector of pipe temp. sensor is

defective

Shut off the power supply and turn on it 1 minute later

The problem comes out again

Is the EEPROM chip plugged in indoor PCB

Correct the connection

Replace the main PCB of indoor unit

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

Yes

Replace the sensor

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Outdoor unit displ ay LED STATUS

No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is

defective

Outdoor unit displ ay LED STATUS

No 4 Indoor units pipe temp. sensor or connector of pipe temp. sensor is

defective

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

Yes

Replace the sensor

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

Yes

Replace the sensor

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

Yes

Replace the sensor

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Outdoor unit display LED STATUS

E4 Open or short circuit of outdoor temperature sensor

Outdoor unit displ ay LED STATUS

E5 Compressor volt protection

Yes

Check the voltage of power supply, if the voltage is about 220V, turn off the

power supply to indoor unit and turn it on again after 1 minute

Does the trouble occur again?

Check the DC voltage between pin P & N on the IPM, if the voltage is

310V~380V, it is OK.

Replace the outdoor power board

Yes

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

Replace the sensor

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Outdoor unit displ ay LED STATUS

E7 Communication error between outdoor IC and DSP

Is the LED in outdoor main PCB light?

1.Is the +5 voltage in outdoor main board? Power Board: CN4, Red wire and yellow (GND) Outdoor main PCB: CZ1

2.Is the +12v voltage in outdoor main board? Power Board: CN1, Purple wire and yellow (GND)

Inverter module defective. Rectifier circuit i

s bad connection or

defective when the voltage in outdoor is abnormal .

P and N 310V~380V(DC)

Yes

Check the signal wires between outdoor

PCBs, is it connected good.

Replace the main control board

Replace the IPM module

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Outdoor unit displ ay LED STATUS

P0 Temperature protection of compressor top.

Off: 105c; On: 90c The trouble shooting is same with the one of indoor unit P2 protection.

Outdoor unit display

LED STATUS

P3 Compressor current protection

Outdoor unit displ ay

LED STATUS

Inverter module protection

The trouble shooting is same with the one of indoor unit P0 protection

Check the resistance of compressor, normally U and V is 0.6 ohm U and W is 0.6 ohm V and W is 0.6 ohm

Turn one ind oor unit only, Does the compressor start after 3 minutes?

Does the trouble occur again after compressor running some time?

Yes

The compressor is defective

Check the refrigerant circulation volume and pressure

The compressor is defective

Yes

If refrigerant circulation volume and pressure is OK, change the outdoor main PCB.

Page 36

Outdoor unit displ ay LED STATUS

P6 Condenser high-temperature protection

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

Is the outdoor pipe temp. more than 65°C ?

Is the outdoor pipe temp sensor right according to the annex 1

Replace the outdoor main board

Yes

Replace the outdoor pipe temp sensor

Page 37

Outdoor unit displ ay LED STATUS

PF PFC module protection

Yes

Check whether the power supply of bridge rectifiers output port is 325VDC

Replace bridge rectifiers

Does the unit work

normally ?

Check whether the power supply of bridge rectifiers input port is normal.

Replace the outdoor PCB

Yes

Replace the PFC inductance

Check whether the

voltage between P and N port in IPM is 380V.

Replace outdoor e-box.

Yes

Check whether the wiring between PCB and PFC module is

normal.

Yes

Check the voltage of power supply, if the voltage is about 220V, turn off the power supply and turn it on again after 1 minute

Yes

Check whether the PFC inductance is normal.

Replace PFC

Page 38

Annex 1

Characteristic of temp. se nsor

-10 62.2756 17 14.6181 44 4.3874

-9 58.7079 18 13.918 45 4.2126

-8 56.3694 19 13.2631 46 4.0459

-7 52.2438 20 12.6431 47 3.8867

-6 49.3161 21 12.0561 48 3.7348

-5 46.5725 22 11.5 49 3.5896

-4 44 23 10.9731 50 3.451

-3 41.5878 24 10.4736 51 3.3185

-2 39.8239 25 10 52 3.1918

-1 37.1988 26 9.5507 53 3.0707

0 35.2024 27 9.1245 54 2.959 1 33.3269 28 8.7198 55 2.8442 2 31.5635 29 8.3357 56 2.7382 3 29.9058 30 7.9708 57 2.6368 4 28.3459 31 7.6241 58 2.5397 5 26.8778 32 7.2946 59 2.4468 6 25.4954 33 6.9814 60 2.3577 7 24.1932 34 6.6835 61 2.2725 8 22.5662 35 6.4002 62 2.1907

9 21.8094 36 6.1306 63 2.1124 10 20.7184 37 5.8736 64 2.0373 11 19.6891 38 5.6296 65 1.9653 12 18.7177 39 5.3969 66 1.8963 13 17.8005 40 5.1752 67 1.830 14 16.9341 41 4.9639 68 1.7665 15 16.1156 42 4.7625 69 1.7055 16 15.3418 43 4.5705 70 1.6469

Page 39

Annex 2

1. Reference voltage data: a) Rectifier : Input :220-230V(AC), output :310V(DC)

b) Inverter module: U,V, W 3ph.

Result U-V 60-150V(AC) U-W 60-150V(AC) V-W 60-150V(AC) P-N DC 310V

c) Photo-couple PC817, PC851: Control side <+5V, AC side :< 24V(AC) d) S terminal and N: changeable from 0-24V

2. Check the Diode Bridge com ponent ( In wiring diagram, rect ifier) Remark: If this part is abn or m al, the LED will not light.

Multi-meter Result

Forward Resistance Backward Resistance

Infinite Infinite

~500 ohm Infinite

~ +

- ~