Midea MPK-09CEN2, MPK-09CRN2, MPK-09EEN2, MPK-09ERN2, MPK-10CEN2 Schematic

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Website: www.mideaaircon.com

Service manual

CAUTION

- BEFORE SERVICING THE UNIT, READ THE SAFETY

- PRECAUTIONS IN THIS MANUAL.

- ONLY FOR AUTHORIZED SERVICE PERSONNEL.

MODELS:

MPK-10CEN2 MPK-10CRN2 MPK-10EEN2 MPK-10ERN2 MPK-12CEN2 MPK-12CRN2 MPK-12EEN2 MPK-12ERN2 MPK-08CE MPK-08CR MPK-08EE MPK-08ER MPK-09CE MPK-09CR MPK-09EE MPK-09ER MPK-10CE MPK-10CR MPK-10EE MPK-10ER

MPK-09CEN2 MPK-09CRN2 MPK-09EEN2 MPK-09ERN2

GD Midea Refrigeration Equipment Co. Ltd Service manual for K portable Series

CONTENTS

1. PREFACE

1.1 SAFETY PRECAUTIONS............................................................................................................................1

1.2 INSULATION RESISTANCE TEST............................................................................................................1

1.3 FEATURES.................................................................................................................................................1

1.4 CONTROL LOCATIONS..............................................................................................................................2

2. TROUBLE SHOOTING GUIDE

2.1 REFRIGERATION CYCLE DIAGRAM........................................................................................................3

2.2 ELECTRIC FUNCTION…..........................................................................................................................3

2.3 TROUBLE SHOOTING GUIDE.................................................................................................................5

3. WIRING DIAGRAM

3.1 WIRING DIAGRAM FOR COOLING ONLY MODELS................................................................................8

3.2 WIRING DIAGRAM FOR COOLING AND HEATING MODELS..................................................................8

3.3 ELECTRICAL CONTROL SCHEME……………………...............................................................................9

3.4 MAIN CONTROL BOARD SCHEME…………………................................................................................10

3.5 DISPLAY BOARD SCHEME…………………………..................................................................................11

4. HOW TO DISASSEMBLE THE UNIT…………………………………………………………………………….12

5. EXPLODED VIEWS…………………………………………...........................................................................19

6. SPARE PARTS LIST…………..………………………………………..…………………………………..……..19

7. SPECIFICATIONS.......................................................................................................................................19

1. PREFACE

This SERVICE MANUAL provides various servicing information, including the mechanical and electrical parts, etc. This room air conditioner was manufactured and assembled under a strict quality control system. The refrigerant was charged at the factory. Be sure to read the safety precautions prior to servicing the unit.

1.1 SAFETY PRECAUTIONS

1. When servicing the unit, set the POWER SWITCH to OFF and unplug the power cord.

2. Inspect the service cord for damage or wear. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.

3. After servicing the unit, make an insulation resistance test to protect the customer from being exposed to shock hazards.

1.2 INSULATION RESISTANCE TEST

1. Unplug the power cord and connect a jumper lead between the two (2) live pins.

2. The grounding conductor (yellow/green) is to be open.

3. Measure the resistance value with an ohm meter between the jumped lead and each exposed metallic part

on the equipment at all the positions (except OFF) of the ROTARY SWITCH or POWER SWITCH.

4. The value should be over 1MΩ.

1.3 FEATURES

Water full alarm

Anti-icing function at cooling mode.

GD Midea Refrigeration Equipment Co. Ltd Service manual for K portable Series

Restart relay protection for the compressor. Temperature sensor err self-diagnose. 24 hours on/off mode time setting. Both temperature mode display Separate motor for indoor and outdoor system. Multiple uses: dehumidifying and cloth drying. Low temperature Drying operation. There are four casters on the bottom for easy movement.

Only one exhaust pipe, which makes the A/C easier to use.

1.4 CONTROL LOCATIONS

For cooling only with electric heater models:

For cooling only models:

Remote-controlled or gentle-touch keys for easy and comfortable use. Compressors of famous brands are adopted for reliability and low noise. The heating system uses PTC electrical heater and will not be affected by ambient temperature, which saves energy. Suitable for local cooling and heating. Condenser shower and large volume tank design. Long time to pour the tank.

Directly drainage available.

Timer On time. Timer OFF button. Push this button to set the Timer Off time. Timer ON/OFF lamp.

Fahrenheit temperature display. When

Fahrenheit temperature display mode is selected.

Celsius temperature display. When Celsius

temperature display mode is selected. Temperature setting up. Push this button to set temperature setting up. Temperature setting down. Push this button to set temperature setting down. Cooling operation lamp.

Remote receiver. Timer ON button. Push this button to set the

Drying operation lamp.

Fan only operation lamp.

Electric heating operation lamp.

Mode setting button. Push this button to select the operation mode: Cool, Dry, Fan only and Heat High fan speed lamp.

Med fan speed lamp.

Low fan speed lamp.

Fan speed setting button. Push this button to select fan speed: High, Med and Low. Power button. Push this button to start the unit.

GD Midea Refrigeration Equipment Co. Ltd Service manual for K portable Series

Water full alarm lamp Power lamp

Remote controller:

LCD display. Mode button: Select the operation mode, AUTO,

COOL, DRY, HEAT (cooling only with electric heater models only) and FAN.

Fan speed button: Select the Fan speed, AUTO,

LOW, MED, HIGH.

ON/OFF button: Press this button to operation

the unit, again to stop.

Temperature setting up button: Press this

button to increase temperature setting or adjust the TIMER in a

2 TROUBLESHOOTING GUIDE

2.1 REFRIGERATION CYCLE DIAGRAM

clockwise direction.

Temperature setting down button: Press this

button to decrease temperature setting or adjust the TIMER in a counter-clockwise direction.

Timer on button: Push this button to set the ON

timer.

Timer off button: Push this button to set the

OFF timer.

Lock button: Press this button to lock all button

except this button.

Reset button: Press this button to reset all

settings to factory settings.

2.2 ELECTRICAL FUNCTION

2.2.1 Electric Control working environment

2.2.1.1 Input voltage: 187~264V for 50Hz models

and 97~127V for 60Hz models;

2.2.1.2 Input power frequency: 50Hz or 60Hz;

2.2.1.3 Ambient temperature: -7°C~+43°C for

cooling only with electric heater models and 10°C~+43°C for cooling only models;

2.2.1.4 Indoor fan normal working amp is less

than 1A;

2.2.1.5 Outdoor fan. Normal working amp is less

than 1.5A;

2.2.1.6 Compressor: single-phase power supply. Its normal working amp is less than 10A;

2.2.2 Proper symbols and their meanings:

TA: Indoor ambient temperature TC: Indoor evaporator temperature TS: Setting temperature through the remote

controller

2.2.3 Systematic functions

Remote receiving (Optional) LED displaying and alarm On or off Timer

GD Midea Refrigeration Equipment Co. Ltd Service manual for K portable Series

Protection for the compressor Water full alarm Anti-icing function at cooling mode. Temperature sensor err self-diagnose. Both temperature mode display

2.2.4 Protection

2.2.4.1 The compressor functions protection with a delay of three minutes.

2.2.4.2 Sensor protection at open or short circuit.

2.2.4.3 Evaporator anti-icing protection at cooling mode.

2.2.4.4 Water full alarm

There are two water position switches used in

the unit. One detects the water depth in the chassis and the other detects the water in the tank.

2.2.4.4.1 Water full alarm will be on when the unit is standing by or operating.

2.2.4.4.2 When the water adds up to the first position on the chassis, the pump will be activated. If the water drops down through the position, the pump will be on and stop after 2 minutes.

2.2.4.4.3 When the water adds up to the position on the tank, the compressor, outdoor fan motor, electric heater and pump will stop operation. And the LED will display “P1” while the water full lamp flashes at 2Hz.

2.2.4.4.4 When the water adds up to the second position on the chassis and the switch has been on for 10 seconds, the whole unit will stop operation. The LED will display “P2” and the water full lamp will flash at 5Hz. After you have clear the problem, you should unplug the unit and plug again. Then the unit will be ready to operate.

2.2.4.4.5 When the unit is standing by, if the unit displays “P1”, the pump will not operate. After the problem is cleared, the unit will be ready to operate. But if you push the power button, the unit will shut the “P1” display and shut down.

2.2.5 Fan-only Mode Function Requirement

2.2.5.1 The compressor and outdoor fan are OFF at Fan-only mode.

2.2.5.2 The speed of indoor fan can be optionally

chosen as High/Mid/Low.

2.2.6 Cooling Mode Function Requirement

2.2.6.1 The speed of indoor fan can be optionally selected as High/Mid/Low.

2.2.6.2 The compressor operate as:

room temperature (TA)

Compressor ON

TS+1 TS

Compressor OFF

Temp down

Temp up

2.2.7 Drying mode

2.2.7.1 When the unit starts to operate in Drying mode, the compressor will start while the room temperature is over 13oC. After the compressor started, the compressor will operate as:

room temperature (TA)

Compressor and outdoor

15C

13C

fan ON

Compressor and outdoor fan OFF

Temp down

Temp up

2.2.7.2 The indoor fan will operate with high speed. The outdoor fan will operate with compressor.

2.2.8 Heating mode

2.2.8.1 The speed of indoor fan can be optionally chosen as High/Mid/Low.

2.2.8.2 Electric heater operate as :

room temperature (TA)

Electric heater OFF

TS+1 TS

Electric heater ON

Temp down

Temp up

2.2.9 Temperature display

2.2.9.1 The setting temperature will be displayed in Cooling and Heating mode. The room temperature will be displayed in Drying and Fan only mode.

2.2.9.2 The setting temperature range is from 17oC to 30oC or 62oF to 88oF. The display temperature range is from 10oC to 35oC or 48oF to 98oF. If the room temperature is lower than 10oC or 48oF, the display will be 10oC or

GD Midea Refrigeration Equipment Co. Ltd Service manual for K portable Series

Test capacitor.

48oF.

2.2.10 Timer Function

2.2.10.1 The maximum length of Timer is 24 hours and the minimum is 0.5 hours.

2.2.10.2 TIMER ON function: first turn OFF the unit, the unit will be automatically ON at the set time.

2.2.10.3 TIMER OFF function: first turn ON the unit, the unit will be automatically OFF at the set time.

2.2.10.4 TIMER ON/OFF function (ON TIMER is earlier than OFF TIMER): first turn OFF the unit, it will be automatically ON at set time,

and later be OFF at the set time.

2.2.10.5 TIMER OFF/ON function (OFF TIMER is earlier than ON TIMER): first turn ON the unit, it will be automatically OFF at set time, and later be ON at the set time.

2.2.10.6 Timer function execution is applicable upon one operation only.

2.2.10.7 Timer precision is less than 15 minutes.

2.2.11 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.

2.3 TROUBLESHOOTING GUIDE

In general, possible trouble is classified in three kinds. One is called Starting Failure which is caused from an electrical defect, another is ineffective Air Conditioning caused by a defect in the refrigeration circuit and improper application, and the other is called the Structure Damage. ROOM AIRCONDITIONER VOLTAGE LIMITS:

NAMEPLATE RATING MINIMUM MAXIMUM

220~240V

115V

196V 103V

253V 122V

PROBLEM POSSIBLE CAUSE REMEDY

Check the power supplier if the power supplier is supplied to the unit. Check the power cord and correct if damaged. Check resistance between the two input/output lines on transformer. Replace the transformer if either of the input/output is open or the transformer is damaged.

Check the voltage on display board. Replace the display board if it is +5V else replace the main PCB.

Check the voltage of battery. Replace batteries if the voltage is lower than 2.3V. Check voltage. Call an electrician if not within limits.

No power display on panel or any one of the buttons failure.

Remote control failure.

Power failure

Transformer (Discharge transformer before testing)

Display board or main PCB failure

Battery failure

Fan motor runs intermittently

Compressor stops instantly after startup.

Cycles on overload.

Refrigerant

Replace if not within +/-10% of manufacture's rating. Check bearings. Replace the motor if the blower wheel cannot rotate freely. Pay attention to any change from high speed to low speed. Replace the motor if the speed does not change. The amount of the refrigerant is too much, making the compressor load too big. Recycle and recharge the refrigerant after checking for the reason.

GD Midea Refrigeration Equipment Co. Ltd Service manual for K portable Series

Test capacitor.

lower hitting scroll. Realign assembly.

Check the capacitor.

Compressor

No power Check voltage at electrical outlet. Correct if none. Water alarm Check and correct if water alarm happens.

Power supply cord

Transformer (Discharge transformer before testing)

Fan motor will not run.

Wire disconnected or connection loose

Main PCB failure

Capacitor (Discharge capacitor before testing)

Will not rotate

Fan blower

Fan motor noise.

Loose screws Tighten them.

Worn bearings

Voltage Check voltage. Call Supply Authority if not within limits.

Wiring

Compressor will not

Main PCB failure Check voltage of main PCB. Replace the main PCB if open.

run while fan motor runs.

Capacitor (Discharge capacitor before testing)

Room temp sensor

Compressor

Excessive noise. Copper tubing

Water full alarm

Water tank full Check and pour if the water tank is full. Water depth sensor if failure Check and replace if failure. Water pump failure Check and replace if the pump if failure. Water depth is over load in chassis

The compressor is blocked inside. Replace after checking for the reason.

Check voltage at the power cord terminal on Main PCB. Replace the power cord if none. Check resistance between the two input/output lines on transformer. Replace the transformer if either of the input/output is open or the transformer is damaged. Connect wire. Refer to wiring diagram for terminal identification. Repair or replace loose terminal. Select fan speed and Check the voltage on main PCB. Replace the main PCB if no voltage in anyone.

Replace if not within +/-10% of manufacture's rating. Replace if shorted, open or damaged. Fan b Check fan motor bearings. Replace the motor if motor shaft do not rotate. Replace the fan blower if cracked, out of balance, or partially missing.

Replace the motor if knocking sounds continue when running or loose, or the motor hums or noise appears to be internal while running.

Check the wire connections, if loose, repair or replace the terminal. If wires are off, refer to wiring diagram for identification, and replace. Check wire locations. If not per wiring diagram, correct.

Replace if not within +/-10% of manufacturers rating. Replace if shorted, open, or damaged. Check the temperature setting if not at the coolest (in cooling mode) or the warmest (in heating mode). Set it if not. Check the compressor for open circuit or ground. If open or grounded, replace the compressor. Remove the cabinet and carefully rearrange tubing not to contact cabinet, compressor, shroud and barrier.

Check and drainage the water in the chassis by open the drainage hose on the chassis.

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