Midea MSV1I-09HRDN1, MSV1I-12HRDN1, M2OA-18HRIN1, M3OA-27HRIN1, M40A-27HRIN1 Schematic

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GD Midea Refrigeration Equipment Co.,Ltd

MULTI SPLIT TYPE, HEAT PUMP AIR CONDITIONERS

Technical service manual 2006

R410A Vertu Inverter multi Series

Indoor Models

Outdoor Models

MSV1I-09HRDN1 MSV1I-12HRDN1

M2OA-18HRIN1 M3OA-27HRIN1

M40A-27HRIN1

1. Product features

2. Dimensions

3. Refrigeration cycle diagram

4. Operation temperature limits

5. Indoor units combination

6. Wiring diagram

7. Wiring connection

8. Electric control functions

9. Troubleshooting

Annex 1 Characteristic of temp. sensor

Annex 2 Reference data

1 Product Features

1.1 Powerful at cooling/heating.

1.2 Low voltage start-up function.

1.3 Anti-icing function at cooling mode.

1.4 Anti-cold air function at heating mode.

1.5 Auto-defrosting.

1.6 Outdoor electric current protection

1.7 Temperature protection of the outdoor compressor top.

1.8 Error self diagnosis function.

1.9 Free connection between indoor and outdoor unit

2 Dimensions

2.1 Indoor unit

Dimension

Mode

9K 795 270 165

12K 845 286 165

W H D

2.2 Outdoor unit

a) Outdoor unit M2OA-18HRIN1& M3OA-27HRIN1

335

b) Outdoor unit M4OA-27HRIN1

845

3 Refrigeration Cycle Diagram

3.1 Refrigeration circuit drawing of inverter quadplex type

4-way valve

Compressor

Exhaust temp. sensor

Axial flow fan

Condenser

Coil temp. sensor

Auxiliary Capillary

Check Valve

Main Capillary

Capillary A

Capillary B

Capillary C

EXV A

EXV B

EXV C

Indoor pipe out temp. seneor A

Indoor pipe out temp. seneor B

Indoor pipe out temp. seneor C

Indoor pipe out temp. seneor D

Outdoor Unit

3.2 Refrigeration circuit drawing of inverter trinary type

Axial

4-way valve

Compressor

Exhaust temp. sensor

flow fan

Condenser

Main Capillary

Coil temp. sensor

Auxiliary Capillary

Check Valve

Capillary A

Capillary B

Capillary C

EXV A

EXV B

EXV C

Indoor pipe out temp. seneor A

Indoor pipe out temp. seneor B

Indoor pipe out temp. seneor C

Filter A

Filter B

Filter C

Filter A

Filter B

Filter C

Liquid valve A

Liquid valve B

Liquid valve C

Liquid valve D

Gas valve A

Gas valve B

Gas valve C

Gas valve D

Liquid valve A

Liquid valve B

Liquid valve C

Gas valve A

Gas valve B

Gas valve C

flow fan

Cross

Evaporator

Indoor Unit

flow fan

Cross

Evaporator

Outdoor Unit

Indoor Unit

3.2 Refrigeration circuit drawing of inverter binary type

Axial flow fan

Exhaust temp. sensor

4-way valve

Compressor

Condenser

Coil temp. sensor

Outdoor Unit

4 Operation Temperature Limits

Cooling mode

Heating mode

Dry mode

EXVA

EXVB

Indoor pipe out temp. seneor A

Indoor pipe out temp. seneor B

Filter A

Filter B

Liquid valve A

Liquid valve B

Gas valve A

Gas valve B

flow fan

Cross

Main Capillary

Auxiliary Capillary

Check Valve

Capillary A

Capillary B

Indoor Unit

Indoor temperature 17℃～32℃

Outdoor temperature 0℃～50℃

Indoor temperature <=30

Outdoor temperature -15℃～33℃

Indoor temperature 10℃～32℃

Outdoor temperature 0℃～50℃

Evaporator

5 Indoor units combination

5.1 M2OA-18HRIN1

5.2 M3OA-27HRIN1

Indoor units can be combined by 7000Btu/h 9000 Btu/h 12000Btu/h 7000Btu/h+9000 Btu/h 7000Btu/h+12000Btu/h 9000Btu/h+9000 Btu/h 9000Btu/h+12000Btu/h 12000Btu/h+12000Btu/h 12000Btu/h+18000Btu/h 9000Btu/h+18000Btu/h 7000Btu/h+18000Btu/h 7000Btu/h*2+9000 Btu/h 7000Btu/h*2+12000 Btu/h 7000Btu/h*2+18000 Btu/h 7000Btu/h*3 9000Btu/h*2+7000 Btu/h 9000Btu/h*2+12000 Btu/h 9000Btu/h*3 12000Btu/h*2+7000 Btu/h 12000Btu/h*2+9000 Btu/h 12000Btu/h+7000Btu/h+9000Btu/h

5.3 M4OA-27HRIN1

Indoor units can be combined by 7000Btu/h 9000 Btu/h 12000Btu/h

7000Btu/h+9000 Btu/h 7000Btu/h+12000Btu/h 9000Btu/h+9000 Btu/h 9000Btu/h+12000Btu/h 12000Btu/h+12000Btu/h 12000Btu/h+18000Btu/h 9000Btu/h+18000Btu/h 7000Btu/h+18000Btu/h 7000Btu/h*2+9000 Btu/h 7000Btu/h*2+12000 Btu/h 7000Btu/h*2+18000 Btu/h 7000Btu/h*3 9000Btu/h*2+7000 Btu/h 9000Btu/h*2+12000 Btu/h 9000Btu/h*2+18000 Btu/h 9000Btu/h*3 12000Btu/h*2+7000 Btu/h 12000Btu/h*2+9000 Btu/h 12000Btu/h*3 7000Btu/h+9000Btu/h+12000Btu/h 7000Btu/h+9000Btu/h+18000Btu/h 9000Btu/h+9000Btu/h+18000Btu/h 7000Btu/h+12000Btu/h+18000Btu/h 9000Btu/h+12000Btu/h+18000Btu/h 7000Btu/h*2+9000 Btu/h*2 7000Btu/h*2+9000 Btu/h+12000 Btu/h 7000Btu/h*3+9000 Btu/h 7000Btu/h*3+12000 Btu/h 7000Btu/h*3+18000 Btu/h 7000Btu/h*4 9000Btu/h*2+7000 Btu/h+12000 Btu/h 9000Btu/h*3+7000 Btu/h 9000Btu/h*3+12000 Btu/h 97000Btu/h*4

Remark:

1. One, two, three or four indoor units can be connected according your need;

2. As 18000 Btu/h unit, just Cassette and duct are available.

3. There should be no more two duct indoor units and other indoor units should be all wall mounted in a system;

4. There should be no more one cassette and other indoor units should be all wall mounted in a system;

5. Cassette and duct can not be combined in a system;

6. When heating, capacity attenuate sharply if indoor unit capacity exceed too much.

6. Wiring Diagram

6.1 Indoor unit

6.2 Outdoor unit M2OA-18HRIN1

6.3 Outdoor unit M3OA-27HRIN1

6.4 Outdoor unit M4OA-27HRIN1

7 Wire connection

7.1 Connection wire specification

Standard

length(mm)

Cores Thickness(mm2) Wire cover

specification

Connection wire between indoor unit and outdoor

6000

(L,N,S,Grounding)

1.0

Neoprene

YZW300/500V

unit

Remark: The connection wire between indoor unit and outdoor unit is standard. And it is packaged in the indoor unit.

7.2 Connection wire drawing

Grouding terminal

Wire connection terminal

N L

Plug

Tight cincture

120

C5A 21*9*37

magnetism cycle

20±10

Heat retractile pipe

2 Neoprene YZW300/500V

Grounding

1.0mm2

8 Electronic control function

8.1 Protection

1. 3 minutes delay at restart for compressor.

2. Temperature protection of compressor top, compressor stops when the temp. of top of

compressor is more than 120℃, compressor runs when the temp. of top of compressor is less than 105℃.

3. When AC voltage ≥ 270V for 30 seconds, Outdoor Unit stops operation and alarms.

When AC voltage ≤ 260V for 30 seconds, outdoor unit resumes operation.

4. Inverter module protection, Inverter module Protection itself has a protection function

against current, voltage and temperature.

5. Sensor protection at open circuit and breaking disconnection.

6. Fan Speed is out of control. When Indoor Fan Speed is too high (higher than High

Fan+300RPM) or too low (lower than 400RPM), the unit stops and LED displays failure information and can’t return to normal operation automatically.

7. Cross Zero signal error warning. If there is no Cross Zero signals in 4 minutes, the unit

stops and LED displays failure information and can’t return to normal operation automatically.

8. Current protection: When the current is more than 25A, the compressor stops.

9. Outdoor condenser high temperature protection: Under cooling mode, if T3>65℃ for 3

minutes, the compressor will stop. When T3<52℃, the protection is not valid.

10. Outdoor low temperature protection: If the outdoor temperature is lower than -15℃

for 1hour, the compressor and fan motor will stop. If the outdoor temperature is higher than

-12℃ for 10 minutes and the compressor stops operation for 1h, or the outdoor

temperature is higher than 5℃ for 10 minutes, then restart and enter into the prior

operation mode.

11. Compressor pre-heating function: When the outdoor temperature is lower than 3℃

and the compressor stops operation for more than 3 hours, or the outdoor temperature is

lower than 3℃ and the power is just put on, the compressor enters into pre-heating condition. When outdoor temp. is more than 5℃ or user operate it, pre-heating condition

will finish.

8.2 Operating mode

8.2.1 Cooling mode

1.Indoor fan keeps running, fan speed can be set in high/mid/low/ Auto:

2.Auto fan at cooling mode: (T=Indoor Temp.-Setting Temp.)

Condition Indoor fan speed

Room temp. up

Room temp. down

T<1.5℃

1.5℃<T<4℃ T>4℃ T> 3℃ 1℃<T<3℃ T<1℃

Low

Mid.

High

Mid.

Low

3.Anti-freezing control to indoor evaporator at cooling mode( T: evaporator temp. )

Evaporator Temp. Compressor

T< 4℃ T > 8℃

Off

8.2.2 Dehumidifying mode

1.The indoor fan is fixed in low speed

2. Low room temperature protection:

When room temperature decreases to below 10 ℃ , indoor fan stop, when room temperature restores to over 12℃, indoor fan start.

3. At dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the

same as that of cooling mode.

8.2.3 Heating mode

1. Indoor Fan actions at heating mode

Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller, but Anti-cold wind function

prevails.

Anti-cold wind control function at heating mode

Condition

Indoor fan speed T= Indoor exchanger temp.

Indoor exchanger temp. up

T<34℃ Off 34℃<T<37℃ Breeze 37℃<T<44℃ Low speed T> 44℃ Setting fan speed

Indoor exchanger temp. down

T> 38℃ Setting fan speed 33℃<T<38℃ Low speed 24℃<T<33℃ Breeze T<24℃ Off

Auto wind at heating mode

Condition

Indoor fan speed

T=Indoor Temp.-Setting Temp.

Room temp. up

T<1.5℃ High

1.5℃<T<2.5℃ Mid. T>2.5℃ Low

Room temp. down

T<1.0℃ High

1.0℃<T<2.0℃ Mid. T>2.0℃ Low

Indoor evaporator high-temperature protection at heating mode

Condition

Compressor

T= Indoor exchanger temp.

T<48℃ On 53℃<T<63℃ Decrease frequency of compressor T>63℃ Off

8.2.4 Defrost operation

1. Defrosting condition: The temperature of outdoor heat exchanger remains consecutively lower than -2°c for more than 40 minutes,

2. Ending condition of defrosting

If one of following conditions is satisfied, end the defrosting and turn into heating mode: a. The defrost time has reached to 10 minutes. b. When the temperature of outdoor heat exchanger rises up to 15°C.

3. Defrosting Actions: a. Compressor runs. b. 4 way valve switches off, c. Outdoor fan switches off d. Indoor fan running according to anti-cold wind function in heating mode.

4. Automatic operation mode The air conditioner automatically selects one of the following operation modes: cooling, heating or fan only according to the temp. difference between room temp. (TA) and set temp. (TS).

TA—TS Operation mode

TA—TS>2℃ Cooling

-1℃≤TA-TS ≤+2℃ Fan-only TA-TS<-1℃ Heating (air-only for cooling only type)

8.3 Mode conflict

The indoor units can not work cooling mode and heating at same time. Heating mode has a priority.

8.3.1Definition

Cooling mode Heating Mode Fan Off Cooling mode No Yes No No Heating Mode Yes No Yes No

Fan No Yes No No

Off No No No No

No: No mode conflict; Yes: Mode conflict

8.3.2 Unit action

• In case of one Indoor unit working in cooling mode or fan mode, and another indoor unit is set to heating mode, the indoor unit working in cooling mode or fan mode will

change to stand by. The outdoor unit will work in heating mode.

• In case of one Indoor unit working in heating mode, and another indoor unit is set to cooling mode or fan mode, the indoor unit setting to cooling mode or fan mode will change to stand by.

8.4 Manual switch

Mode changes when push this button. Cooing modeÆ Auto modeÆUnit offÆ Cooing mode At Cooing mode, after 30 minutes cooling operation whose fan speed is set as low, the

A/C operates with a setting temp. of 24℃. At auto mode, the A/C operates with a set temp. of 24℃

8.5 Timer Function

1. The maximum length of timer is 24 hours and the minimum resolving power is 15 minutes.

2. Timer on: first turn off the A/C, the A/C will be automatically on at the set time.

3. Timer off: first turn on the A/C, the A/C will be automatically off at the set time

4. Timer on/off function( on time is earlier than off time): first turn off the A/C, it will be

automatically on at set time, and later be off at the set time, then unit turns on at set time.

5. Timer off/on function( off time is earlier than on time): first turn on the A/C, it will be

automatically off at set time, and later be on at the set time, then unit turns off at set time.

8.6 Sleep mode

8.6.1It is available at cooling, heating or auto mode.

8.6.2Cooling:

The set temperature rise 1℃ per hour. Two hours later, the set temperature will maintain as

a constant and the fan speed is kept at low speed.

8.6.3Heating:

The set temperature decrease 1℃ per hour. Two hours later, the set temperature will

maintain as a constant and the air circulation is kept at low speed (Cold air proof function takes precedence over all).

8.6.4 Auto:

The Sleep Mode running function operates in accordance with selected running mode by auto mode.

8.6.5After 7 hours, unit cancels this mode automatically.

J2 On On Off Off

J3 On Off On Off

Stop time 7 hours 8 hours 6 hours 7 hours

8.7 Auto restart function

In case of a sudden power failure, this function automatically sets the unit to previous settings before the power failure when power returns.

8.8 Capacity test frequency locked.

When test the cooling capacity, the frequency can be locked at Rated Frequency by following the below:

1. Set the indoor temp. to 17℃ and high speed;

2. Push the outdoor check button for 5 seconds, then its frequency can be fixed at Rated

Frequency.

After the test is over, turn off the indoor to exit. When test the heating capacity, the frequency can be locked at 85Hz by following the below:

1. Set the indoor temp. to 30℃ and high speed;

2. Push the outdoor check button for 5 seconds, then its frequency can be fixed at Rated Frequency.

After the test is over, turn off the indoor to exit.

8.9 Indoor unit indicator displayer

8.9.1 OPERATION indicator

This indicator flashes after power is on and illuminates when the unit is in operation.

8.9.2 AUTO indicator

This indicator illuminates when the air conditioner is in AUTO operation.

8.9.3 TIMER indicator

This indicator illuminates when TIMER is set ON/OFF.

8.9.4 CLEAN AIR indication lamp Lights up when CLEAN AIR feature is activated and Ionizer can generate abundant anions to fill the room with refreshing and natural air.

8.9.5 PRE.-DEF. Indicator (For Cooling & Heating models only) This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating mode.

8.9.6 TURBO indication lamp Lights up when select TURBO function on cooling operation or on heating operation.

8.9.7 FREQUENCY indicator This indicator appears only when the compressor is in operation and indicates the current operating frequency.

8.9.8 TEMPERATURE indicator Usually it displays the temperature settings. When change the setting temperature, this indicator begins to flash, and stops 20 seconds later. It displays the room temperature when the air conditioner is in FAN only operation. When the unit stops operation, it returns to original factory settings.

Displays the malfunction code or protection code.

8.9.9 FAN SPEED indication lamp Displays the selected fan speed: AUTO(nothing) and three fan speed levels: LOW, MED

and HIGH.

8.10 Outdoor unit LED display function:

1. When stand-by it display number of indoor unit online;

2. When operation it display frequency of outdoor unit;

3. When defrost it display “df”;

4. When a protection or error occurred, it displays error code or protection code.

8.11 Check function:

There is a check button on outdoor pcb. When push this button, the outdoor LED can display in sequence: Capacity demand→Running mode →revised capacity → fan state →No.1 evaporator pipe temp. →No.2 evaporator pipe temp.→No.3 evaporator pipe temp.→No.4 evaporator pipe temp.→outdoor pipe temp. → Outdoor temp. →discharge gas temp.→current of outdoor unit → No. 1 opening degree of electronic expansion valve → No. 2 opening degree of EXV → No. 3 opening degree of EXV→No. 4 opening degree of EXV→indoor unit number→last protection/error code→capacity demand(cycle) Explanation for the some display content:

1. Running mode:

Display Corresponding mode 0 Off 1 Cooling mode 2 Heating mode

2. Fan state:

Display Corresponding mode 0 Off 1 Low fan 2 High fan

3. Opening degree of EXV: Opening degree equals the display data times 8;

4. Number of indoor unit The indoor unit that can communicate with outdoor unit normally.

8.12 Outdoor fan speed control

There is one fan with two-speed, the fan speed is controlled according ambient temp. After the compressor stop, 30 seconds later the fan stops. When cooling:

Ambient temp.rise

temp.decline

> 27 High speed

<27 Low speed

>25 High speed Ambient

<25 Low speed

When heating:

Ambient temp.rise

temp.decline

> 14 Low speed

<14 High speed

>12 Low speed Ambient

<12 High speed

8.13 Oil return function

If operation frequency is lower than 54Hz in 2 hours consecutively, it will be increased to 62Hz for 3 minutes. Then it recovers to the former operation frequency.

9 Troubleshooting for outdoor unit

9.1 Safety

Because of there are capacitors in PCB and relative circuit in outdoor unit, even shut down the power supply, electricity power still are kept in capacitors, do not forget to discharge the electricity power in capacitor. The value of resistance is about 1500 ohm to 2000 ohm

Resistance

The voltage in P3 and P4 in outdoor PCB is high voltage about 310V The voltage in P5 and P6 in outdoor PCB is high voltage about 310V

9.2 LED error code display for indoor unit

Display LED STATUS

E0 EEPROM error

E1 Indoor and outdoor unit communication error

E2 Zero-crossing examination error

E3 Fan speed beyond control

E5 Outdoor units temp. sensor or connector of temp. sensor is defective

E6 Indoor units temp. sensor or connector of temp. sensor is defective

P0 Inverter module protection

P1 Outdoor unit voltage protection

P2 Compressor top temperature protection

P3 Outdoor low temp. protection

P4 Inverter compressor drive protection

P5 Mode conflict protection

9.3 LED error code display for outdoor unit

Display Explanation

E0 EEPROM error

E1 No 1 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

E2 No 2 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

E3 No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

E4 Outdoor temp. sensor or connector of temp. sensor is defective

E5 Compressor voltage protection

E6 No 4 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

E7 Outdoor inverter communication error

P0 Compressor top protection against temperature

P1 High pressure protection (reserve)

P2 Low pressure protection (reserve)

P3 Compressor current protection

P4 Inverter module protection

P5 Outdoor low temp. protection

P6 Condenser high-temperature protection

9.3 Trouble shooting

Display LED STATUS

E0 EEPROM error

Temporarily turn off the power supply and turn it on again after 1 minute

Does the trouble occur again?

Replace the indoor PCB

Yes

ection to connecto

sor

good

Display LED STATUS

E1 No 1 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

Replace the sensor

Yes

Display LED STATUS

E2 No 2 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

Is conn

r of pipe temp. sen

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

Replace the sensor

Yes

Repair connector

Display LED STATUS

E3 No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

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

Replace the sensor

Yes

Repair connector

Display LED STATUS

E4 Outdoor units temp. sensor or connector of temp. sensor is defective

Is connection to connector of pipe temp. sensor good?

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

Replace the sensor

Yes

Repair connector

Display LED STATUS

E5 Compressor voltage protection

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 voltage of secondary of T3 transformer in outdoor power board,

is this voltage 12-14V (AC)

Yes

Replace the outdoor power board

Display LED STATUS

E7 Indoor / outdoor units communication protection

Is the LED in outdoor main PCB light?

Yes

Check the signal wires between outdoor

PCB’s, is it connected good.

1.Is the +5 voltage in outdoor main board?

Power Board: CN1, Red wire and yellow (GND)

Outdoor main PCB: CZ1

2.Is the +12 voltage in outdoor main board?

Power Board: CN1, Purple wire and yellow (GND)

Inverter module defective.

Rectifier circuit is bad connection or

defective when the voltage in outdoor is

abnormal .

P3 and P4: 310V(DC);

P5 and P6: 310V(DC);

Check the PC521,PC851 (at Outdoor power PCB)

Normally:

Input voltage: <5V, changeable

Output voltage:<24V, changeable

Yes

Outdoor power PCB is defective.

Yes

Check the PC817,PC851 (at Indoor main PCB and

outdoor main board)

Normally:

Input voltage: <5V, changeable

Output voltage:<24V, changeable

Indoor PCB or outdoor main PCB

are defective.

Display LED STATUS

P0 Compressor top protection against temperature

Off: 120℃; On: 105℃

Does compressor operate?

Yes

Is refrigerant circulation volume normal?

Gas charging

Is abnormality the same after gas charging?

Is protector on the top of compressor

normal? Normally the resistance of

the protector is 0 ohm.

Yes

Check the outdoor main PCB.

Replace protector

Refrigerant system (such as clogging of capillary, clogging of pipe etc)

Display LED STATUS

P3 Compressor current 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 indoor unit only, Does the compressor start after

3 minutes?

The compressor is defective

Does the trouble occur again after compressor

running some time?

Yes

The compressor is defective

Yes

Check the refrigerant circulation volume and pressure

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

Display LED STATUS

P4 Inverter module protection

Check the connectors CN12, CN7, CN1 in outdoor PCBs Is connection to connector good?

Yes No

Are the wires to compressor right?

Yes

Check the outdoor inverter module.

Is it breakdown between P-N,P-U,P-V;N-W,N-U,N-V

At inverter module

Normally,

P-N: ~1.0MΏ

P-U: ~2.0MΏ

P-V: ~2.0MΏ

P-W: ~2.0MΏ

N-W: ~1.0MΏ

N-U: ~1.0MΏ

N-V: ~1.0MΏ

Check compressor

1.Turn on the unit in cooling or heating in different season, use a frequency

meter to test the frequency in one of the three wires to compressor, if there

is frequency in wires, but compressor do not run, the compressor is

defective.

2.Between U,V,W three terminals , the resistance is about 0.6 Ώ.

Repair connector

Yes

Inverter module is defective

Display LED STATUS

P5 Outdoor low temp. protection

This is optional, factory standard unit does not have this function.

Unit stops when outdoor temp. is lower than -15°C and lasting time more than 60 minutes, and unit

runs again when outdoor temp. more than -12°C.

Is the outdoor temp. lower than -15°C?

Is the outdoor temp sensor right according to the annex 1

Replace the outdoor main board

Yes

Replace the outdoor temp sensor

Display 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. is 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

Annex 1

Characteristic of temp. sensor

Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ

-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

Annex 2

1. Reference voltage data:

a) Rectifier : Input :220-230V(AC), output :310V(DC)

Normally In power board:

P3 and P4: 310V(DC)

P5 and P6: 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 component ( In wiring diagram, rectifier)

Remark: If this part is abnormal, the LED will not light.

~ +

Multi-meter

- ~

Result

Forward Resistance Backward Resistance

+ _ Infinite Infinite ~

~500 ohm Infinite

~ -

~500 ohm Infinite

Midea MSV1I-09HRDN1, MSV1I-12HRDN1, M2OA-18HRIN1, M3OA-27HRIN1, M40A-27HRIN1 Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual