Midea MSMBBU-12HRFN1-QRD0GW, MOB01-18HFN1-QRD0GW, MOB01-12HFN1-QRD0GW, MSMBCU-18HRFN1-QRD0GW, MSMBDU-24HRFN1-QRD0GW Service Manual

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Page 1

Mission 3D Inverter Series

Service Manual 2014

MBSEU-A-1412

Page 2

CONTENTS

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

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

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

2. Function ........................................................................................................................................................ 6

3. Dimension .................................................................................................................................................... 7

3.1 Indoor Unit ..................................................................................................................................... 7

3.2 Outdoor Unit ................................................................................................................................ 10

4. Refrigerant Cycle Diagram ....................................................................................................................... 13

5 Installation Details ...................................................................................................................................... 14

5.1 Wrench torque sheet for installation ........................................................................................... 14

5.2 Connecting the cables ................................................................................................................ 14

5.3 Pipe length and the elevation ..................................................................................................... 15

5.4 Installation for the first time ......................................................................................................... 16

5.5 Adding the refrigerant after running the system for many years ................................................ 17

5.6 Re-installation while the indoor unit need to be repaired ........................................................... 18

5.7 Re-installation while the outdoor unit need to be repaired ......................................................... 19

6. Operation Characteristics ......................................................................................................................... 21

7. Electronic function .................................................................................................................................... 22

7.1 Abbreviation ................................................................................................................................ 22

7.2 Display function ........................................................................................................................... 22

7.3 Main Protection ........................................................................................................................... 23

7.4 Operation Modes and Functions ................................................................................................. 24

8. Troubleshooting ......................................................................................................................................... 28

8.1 Indoor Unit Error Display ............................................................................................................. 29

8.2 Trouble shooting.......................................................................................................................... 30

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1. Precaution

1.1 Safety Precaution

 To prevent injury to the user or other

people and property damage, the following instructions must be followed.

 Incorrect operation due to ignoring

instruction will cause harm or damage.

 Before service the unit, be sure to

read this service manual at first.

1.2 Warning

 Installation

 Do not use a defective or underrated

circuit breaker. Use this appliance on a dedicated circuit.

There is risk of fire or electric shock.

 For electrical work, contact the dealer,

seller, a qualified electrician, or an authorized service center.

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

 Always ground the product.

There is risk of fire or electric shock.

 Install the panel and the cover of

control box securely.

There is risk of fire of electric shock.

 Always install a dedicated circuit and

breaker.

Improper wiring or installation may cause fore or electric shock.

 Use the correctly rated breaker of

fuse.

There is risk of fire or electric shock.

 Do not modify or extend the power

cable.

There is risk of fire or electric shock.

 Do not install, remove, or reinstall the

unit by yourself (customer).

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

 Be caution when unpacking and

installing the product.

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

 For installation, always contact the

dealer or an authorized service center.

 Do not install the product on a

defective installation stand.

 Be sure the installation area does not

deteriorate with age.

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

 Do not let the air conditioner run for a

long time when the humidity is very high and a door or a window is left open.

 Take care to ensure that power cable

could not be pulled out or damaged during operation.

There is risk of fire or electric shock.

 Do not place anything on the power

cable.

There is risk of fire or electric shock.

 Do not plug or unplug the power

supply plug during operation.

There is risk of fire or electric shock.

 Do not touch (operation) the product

with wet hands.

 Do not place a heater or other

appliance near the power cable.

There is risk of fire and electric shock.

 Do not allow water to run into

electrical parts.

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

 Do not store or use flammable gas or

combustible near the product.

There is risk of fire or failure of product.

 Do not use the product in a tightly

closed space for a long time.

Oxygen deficiency could occur.

 When flammable gas leaks, turn off

the gas and open a window for ventilation before turn the product on.

 If strange sounds or smoke comes

from product, turn the breaker off or disconnect the power supply cable.

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There is risk of electric shock or fire.

 Stop operation and close the window

in storm or hurricane. If possible, remove the product from the window before the hurricane arrives.

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

 Do not open the inlet grill of the

product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.)

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

 When the product is soaked, contact

an authorized service center.

There is risk of fire or electric shock.

 Be caution that water could not enter

the product.

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

 Ventilate the product from time to

time when operating it together with a stove etc.

There is risk of fire or electric shock.

 Turn the main power off when

cleaning or maintaining the product.

There is risk of electric shock.

 When the product is not be used for a

long time, disconnect the power supply plug or turn off the breaker.

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

 Take care to ensure that nobody

could step on or fall onto the outdoor unit.

This could result in personal injury and product damage.

 CAUTION

 Always check for gas (refrigerant)

leakage after installation or repair of product.

Low refrigerant levels may cause failure of product.

 Install the drain hose to ensure that

water is drained away properly.

A bad connection may cause water leakage.

 Keep level even when installing the

product.

It can avoid vibration of water leakage.

 Do not install the product where the

noise or hot air from the outdoor unit could damage the neighborhoods.

It may cause a problem for your neighbors.

 Use two or more people to lift and

transport the product.

 Do not install the product where it will

be exposed to sea wind (salt spray) directly.

It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or inefficient operation.

 Operational

 Do not expose the skin directly to

cool air for long time. (Do not sit in the draft).

 Do not use the product for special

purposes, such as preserving foods, works of art etc. It is a consumer air conditioner, not a precision refrigerant system.

There is risk of damage or loss of property.

 Do not block the inlet or outlet of air

flow.

 Use a soft cloth to clean. Do not use

harsh detergents, solvents, etc.

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

 Do not touch the metal parts of the

product when removing the air filter. They are very sharp.

 Do not step on or put anything on the

product. (outdoor units)

 Always insert the filter securely.

Clean the filter every two weeks or more often if necessary.

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

 Do not insert hands or other objects

through air inlet or outlet while the product is operated.

 Do not drink the water drained from

the product.

Page 5

 Use a firm stool or ladder when

cleaning or maintaining the product.

Be careful and avoid personal injury.

 Replace the all batteries in the remote

control with new ones of the same type. Do not mix old and new batteries or different types of batteries.

There is risk of fire or explosion.

 Do not recharge or disassemble the

batteries. Do not dispose of batteries in a fire.

They may burn of explode.

 If the liquid from the batteries gets

onto your skin or clothes, wash it well with clean water. Do not use the remote of the batteries have leaked.

Page 6

2. Function

Model Names of Indoor/Outdoor Units

3D inverter

Capacity

Indoor units

Outdoor units

MSMBAU-09HRFN1-QRD0GW

MOB01-09HFN1-QRD0GW

12k

MSMBBU-12HRFN1-QRD0GW

MOB01-12HFN1-QRD0GW

18k

MSMBCU-18HRFN1-QRD0GW

MOB01-18HFN1-QRD0GW

24k

MSMBDU-24HRFN1-QRD0GW

MOF2-24HFN1-QRD0GW

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3. Dimension

3.1 Indoor Unit

Model

W D H

MSMBAU-09HRFN1-QRD0GW

730

198

293

MSMBBU-12HRFN1-QRD0GW

810

200

300

MSMBCU-18HRFN1-QRD0GW

980

225

325

MSMBDU-24HRFN1-QRD0GW

1090

235

338

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For MSMBAU-09HRFN1-QRD0GW:

For MSMBBU-12HRFN1-QRD0GW:

For MSMBCU-18HRFN1-QRD0GW:

For MSMBDU-24HRFN1-QRD0GW:

Page 9

Page 10

3.2 Outdoor Unit

More than 30cm

More than 60cm

More than 200cm

More than 30cm

More than 60cm (Service space)

Fence or

obstacles

Page 11

For MOB01-09HFN1-QRD0GW, MOB01-12HFN1-QRD0GW, MOB01-18HFN1-QRD0GW,

Page 12

For MOF2-24HFN1-QRD0GW,

Model

W D H

W1 A B

MOF2-24HFN1-QRD0GW

845

320

700

908

560

335

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4. Refrigerant Cycle Diagram

LIQUID SIDE

GAS SIDE

HEAT EXCHANGE (EVAPORATOR)

HEAT EXCHANGE (CONDENSER)

COMPRESSOR

2-WAY VALVE

3-WAY VALVE

4-WAY VALVE

COOLING HEATING

T2 Evaporator temp. sensor

T1 Room temp. sensor

ACCUMULATOR

INDOOR OUTDOOR

CHECK VALVE (Heating Model only)

CAPILIARY TUBE

Page 14

5 Installation Details

5.1 Wrench torque sheet for installation

Outside diameter

Torque

Additional tightening torque

inch

N.cm

Ф6.35

1/4

1500(153kgf.cm)

1600(163kgf.cm)

Ф9.52

3/8

2500(255kgf.cm)

2600(265kgf.cm)

Ф12.7

1/2

3500(357kgf.cm)

3600(367kgf.cm)

Ф15.9

5/8

4500(459kgf.cm)

4700(479kgf.cm)

Ф19

3/4

6500(663kgf.cm)

6700(683kgf.cm)

5.2 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

>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.

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5.3 Pipe length and the elevation

The pipe length and refrigerant amount:

Model

Pipe size

Standard

length

(m)

Max.

Elevation

B (m)

Max.

Length

A (m)

Additional

refrigerant

(g/m)

Gas

Liquid

MSMBAU-09HRFN1-QRD0GW + MOB01-09HFN1-QRD0GW

3/8’’

(Ф9.52)

1/4’’

(Ф6.35)

MSMBBU-12HRFN1-QRD0GW + MOB01-12HFN1-QRD0GW

3/8’’

(Ф9.52)

1/4’’

(Ф6.35)

MSMBCU-18HRFN1-QRD0GW + MOB01-18HFN1-QRD0GW

1/2’’

(Ф12.7)

1/4’’

(Ф6.35)

MSMBDU-24HRFN1-QRD0GW + MOF2-24HFN1-QRD0GW

5/8’’

(Ф15.9)

3/8’’

(Ф9.52)

Caution:

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

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5.4 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

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

Page 17

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.

5.5 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.

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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.

5.6 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 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 18N.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

Page 19

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.

5.7 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.

Page 20

Be sure to check for gas leakage

Page 21

6. Operation Characteristics

Mode

Temperature

Cooling operation

Heating operation

Drying operation Room temperature

17℃~32℃ (62℉~90℉)

0℃~30℃ (32℉~86℉)

10℃~32℃ (50℉~90℉)

Outdoor temperature

0℃~50℃ (32℉~122℉)

-20℃~30℃ (-4℉~86℉)

0℃~50℃ (32℉~122℉)

-15℃~50℃ (5℉~122℉) (For the models with low temperature cooling system)

CAUTION:

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

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

2. The room relative humidity should be less than 80%. If the air conditioner operates beyond this figure, the surface of the air conditioner may attract condensation. Please set the vertical air flow louver to its maximum angle (vertically to the floor), and set HIGH fan mode.

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

Page 22

7. Electronic function

7.1 Abbreviation

T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature T5: Compressor discharge temperature

7.2 Display function

7.2.1 Icon explanation on indoor display board.

Digital display: Displays the temperature settings when the air conditioner is operational. Displays the room temperature in FAN mode. Displays the self-diagnostic codes.

Dispalys ‘ ’ for three seconds when Timer ON, Fresh, Swing, Turbo or Silence feature is activated.

Dispalys ‘ ’ for three seconds when Timer OFF is set.

Dispalys ‘ ’ for three seconds when Fresh,

Swing, Turbo or Silence feature is cancelled.

Dispalys ‘ ’ under deforsting operation.

Dispalys ‘ ’ when anti-cold air feature is activated under heating mode.

Dispalys ‘ ’ during self clean operation (if aplicable).

Dispalys ‘ ’ under 8℃ heating operation (if aplicable).

When ECO function(optional) is actived,the

“ ” illuminates gradually one by one as

In one second interval.

WIFI control display(optional) Displays when the WIFI control feature is acticated.(Not available when the unit does not have this function)

NOTE: A guide on using the infrared remotr is included in this literature package.

Page 23

7.3 Main Protection

7.3.1 Three minutes delay at restart for compressor

Less than 1 minute delay for the 1st time stand-up and 3 minutes delay for others.

7.3.2 Temperature protection of compressor top

The unit will stop working when the compressor top temp. protector cut off, and will restart after the compressor top temp. protector restart.

7.3.3 Temperature protection of compressor discharge

Compressor discharge temp. T5>115℃ for 5s, compressor stops.

7.3.4 Fan speed is out of control

When indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will display the failure

7.3.5 Inverter module protection

The Inverter module has a protection function about current, voltage and temperature. If these protections happen, the corresponding code will display on indoor unit and the unit will stop working.

7.3.6 Indoor fan delayed open function

When the unit starts up, the louver will be active immediately and the indoor fan will open 7s later. If the unit runs in heating mode, the indoor fan will be also controlled by anti-cold wind function.

7.3.7 Compressor preheating functions

Preheating permitting condition: When T4(outdoor ambient temperature)＜3°C , the preheating function will be activated.

7.3.8 Sensor protection at open circuit and breaking disconnection.

When there’s only one temperature sensor in malfunction , the air conditioner will keep working but show the error code, in case of any emergency use. When there’s more than one temperature sensor in malfunction, the air conditioner will stop working

7.3.9 Refrigerant leakage detection

This function is only active in cooling mode. It can better prevent the compressor being damaged by refrigerant leakage or compressor overload. Open condition: When compressor is active, the value of the Coil temperature of evaporator T2 has no change or very little change.

Page 24

7.4 Operation Modes and Functions

7.4.1 Fan mode

(1) Outdoor fan and compressor stop.

(2) Temperature setting function is disabled, and no setting temperature is displayed. (3) Indoor fan can be set to high/med/low/auto. (4) The louver operates same as in cooling mode. (5) Auto fan:

7.4.2 Cooling Mode

7.4.2.1 Compressor running rules

When T1-Ts<-2℃, the compressor will stop, when T1—TS>-0.5℃，the compressor will be activated. When the AC run in mute mode, the compressor will run with low frequency. When the current is more than setting value, the current protection function will be activated, and the compressor will stop.

7.4.2.2 Outdoor fan running rules

The outdoor unit will be run at different fan speed according to T4.

A+

7.4.2.3Indoor fan running rules

In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low and auto. When the setting temp. is reached,if the compressor stop running,indoor fan motor will run in Minimum speed or setting speed. The indoor fan is controlled as below:

Setting fan

speed

Actual fan speed

H+(H+=H+G) A H（=H） B C

M+(M+=M+Z) D M(M=M) E F

L+(L+=L+D) G L(L=L) H I

T1-Td ℃(°F)

L-(L-=L-D)

H-（H-=H-G)

M-(M-=M-Z)

The auto fan acts as below rules:

7.4.2.4 Condenser temperature protection

Page 25

Resume

Off

Decrease

Hold

When condenser temperature temp. is more than setting value, the compressor will stop.

7.4.2.5 Evaporator temperature protection

When Evaporator temperature temp.is less than setting value, the compressor will stop.

7.4.3 Heating Mode

7.4.3.1 Compressor running rules

When T1-Ts><-ΔT, the compressor will stop, when T1—TS<ΔT-1.5 时，the compressor will be on.

ΔT is the programmed parameter of

temperature compensation. When the AC run in mute mode,the compressor will run with low frequency. When the current is more than setting value,the current protection function will be activated and the compressor will stop.

7.4.3.2 Outdoor fan running rules

The outdoor unit will be run at different fan speed according to T4.

A+

7.4.3.3 Indoor fan running rules When the compressor is on, the indoor fan can

be set to high/med/low/auto/mute. When indoor unit coil temp. is low,the anti-cold air function will start and indoor fan motor will run at low speed,the speed can’t be changed ,when the temp. is lower than setting value,the indoor fan motor will stop. When the indoor temp reaches the setting temp.,the compressor will stop,the indoor fan motor will run at the minimum speed or setting speed.(The anti-cold air function is valid). The indoor fan is controlled as below:

Setting fan

speed

Actual fan speed

H（=H）

H+(H+=H+G)

M(M=M)

M+(M+=M+Z)

L(L=L)

L+(L+=L+D)

H-（H-=H-G)

M-(M-=M-Z)

L-(L-=L-D)

T1-Td℃

Auto fan action in heating mode:

Page 26

T1-Td+ΔT

7.4.3.4Defrosting mode

AC will enter the defrosting mode according to the value of temp. of T3 and the value range of temp. change of T3 and also the compressor running time. During the defrosting mode, the compressor keep running, indoor and outdoor motor will stop, defrost lamp of the indoor unit will be lighted

“ .” Will be displayed.

7.4.3.5 Evaporator coil temperature protection

Resume

Off

Decrease

Hold

When evaporator temperature temp. is more than the setting protection value, the compressor will stop.

7.4.4 Auto-mode

This mode can be chosen with remote controller and the setting temperature can be changed between 17°C ~30°C In auto mode, the machine will choose cooling, heating or fan-only mode according to ΔT (ΔT =T1-Ts).

T1-Ts

Cooling

Heating*

Fan only

Indoor fan will run at auto fan of the relevant mode. The louver operates same as in relevant mode. If the machine switches mode between heating and cooling, the compressor will keep stopping for certain time and then choose mode according to T1-Ts. If the setting temperature is modified, the machine will choose running function again.

7.4.5 Drying mode

Indoor fan speed is fixed at breeze and can’t be

changed. The louver angle is the same as in cooling mode. All protections are active and the same as that in cooling mode.

7.4.6 Forced operation function

Forced cooling mode: The compressor and outdoor fan keep running and the indoor fan runs at low speed. After running for 30 minutes, AC will turn to auto mode with 24℃ setting temperature. Forced auto mode: The action of forced auto mode is the same as normal auto mode with 24℃ setting temperature. When AC receives signals, such as switch on, switch off, timer on, timer off, mode setting, fan speed setting, sleeping mode setting, follow me setting, it will quit the forced operation.

Page 27

7.4.7 Auto-Restart function

The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart module. In case of a sudden power failure, the module memorizes the setting conditions before the power failure. The unit will resume the previous operation setting (not including swing function) automatically after 3 minutes when power returns. If the memorization condition is forced cooling mode, the unit will run in cooling mode for 30 minutes and turn to auto mode as 24℃ setting temp. If AC is off before power off and AC is required to start up now, the compressor will have 1 minute delay when power on. Other conditions, the compressor will have 3 minutes delay when restarts.

7.4.8 8℃ Heating(optional)

When the compressor is running, the indoor fan motor will run without anti-cold air function. When the compressor is off, the indoor fan motor is off .

Page 28

8. Troubleshooting

Safety

Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity power in capacitor.

Electrolytic Capacitors

(HIGH VOLTAGE! CAUTION!)

For other models, please connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, terminals of the electrolytic capacitor on the contrary side of the outdoor PCB.

Note: The picture above is only for reference. The plug of your side may be different.

Page 29

8.1 Indoor Unit Error Display

Operation

lamp

Timer lamp

Display

LED STATUS

☆ 1 time

Indoor unit EEPROM parameter error

☆ 2 times

Indoor / outdoor units communication error

☆ 4 times

Indoor fan speed has been out of control

☆ 5 times

Indoor room temperature sensor T1 open circuit or short circuit

☆ 6 times

Evaporator coil temperature sensor T2 open circuit or short circuit

☆ 7 times

Refrigerant leakage detection

☆ 2 times

Outdoor ambient temperature sensor T4 open circuit or short circuit

☆ 3 times

Condenser coil temperature sensor T3 open circuit or short circuit

☆ 4 times

Compressor discharge temperature sensor T5 open circuit or short circuit

☆ 5 times

Outdoor unit EEPROM parameter error

☆ 6 times

Outdoor fan speed has been out of control

☆ 1 times

☆

IPM malfunction or IGBT over-strong current protection

☆ 2 times

☆

Over voltage or over low voltage protection

☆ 3 times

☆

High temperature protection of compressor top diagnosis and solution

☆ 5 times

☆

Inverter compressor drive error

O（light） X（off） ☆（flash）

Page 30

8.2 Trouble shooting

8.2.1 EEPROM parameter error diagnosis and solution(E0/F4)

Error Code

E0/F4

Malfunction decision conditions

Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.

Supposed causes

● Installation mistake

● PCB faulty

Trouble shooting:

Yes

Replace the indoor/outdoor

main PCB.

Power off, then restart the

unit 2 minutes later.

EEPROM: a read-only memory whose contents can be erased and reprogrammed using a pulsed voltage. For the location of EEPROM chip, please refer to the below photos.

Note: The two photos above are only for reference, it’s may be not same totally with the ones on your side.

Indoor PCB

Outdoor PCB

Page 31

8.2.2 Indoor / outdoor unit’s communication diagnosis and solution(E1)

Error Code

Malfunction decision conditions

Indoor unit does not receive the feedback from outdoor unit during

110 seconds and this condition happens four times continuously.

Supposed causes

● Wiring mistake

● Indoor or outdoor PCB faulty

Trouble shooting:

Measure Vs, is it positive fluctuation? (Vs is the voltage between S and N of outdoor unit. Red pan-S, Black pan-N)

Yes

Power off, then restart the unit 2 minutes later

Replace the outdoor main PCB.

Power on. Is the error

extinguished?

Replace the outdoor main PCB.

Power on. Is the error

extinguished?

Check the outdoor wiring connection

Replace the indoor main PCB.

Power on. Is the error

extinguished?

Replace the indoor main PCB.

Power on. Is the error

extinguished?

Yes

Replace the outdoor main PCB.

Replace the indoor main PCB.

Check the indoor wiring connection

Yes

Check whether reactor is normal?

Yes

Replace the reactor

Page 32

8.2.4 Fan speed has been out of control diagnosis and solution(E3)

Error Code

E3/F5

Malfunction decision conditions

When indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will display the failure.

Supposed causes

● Wiring mistake

● Fan ass’y faulty

● Fan motor faulty

● PCB faulty

Trouble shooting:

Power off, then restart the

unit 2 minutes later

Shut off the power supply, Rotate the fan by hand.

The unit operates normally.

Find out the cause and have

it solved

Check the wiring of fan

motor

Yes

Correct the connections.

NoReplace the fan motor

Yes

Measure the voltage for the

fan motor from the main

PCB

Yes

Replace the main PCBNo

Page 33

Index1: 1:Indoor or Outdoor DC Fan Motor(control chip is in 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 has problems and need to be replaced.

DC motor voltage input and output

NO.

Color

Signal

Voltage

Red

Vs/Vm

280V~380V

---

Black

GND

White

Vcc

14-17.5V

Yellow

Vsp

0~5.6V

Blue

14-17.5V

2. Outdoor DC Fan Motor (control chip is in outdoor PCB) Power on ,and check if the fan can run normally, if the fan can run normally, the PCB must has problems and need to be replaced, If the fan can’t run normally, measure the resistance of each two pins. If the resistance is not equal to each other, the fan motor must have problems and need to be replaced, otherwise the PCB must has problems and need to be replaced.

3. Indoor AC Fan Motor Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply)or 50V(115V power supply), the PCB must has problems and need to be replaced.

Page 34

8.2.4 Refrigerant Leakage Detection diagnosis and solution(EC)

Error Code

Malfunction decision conditions

Define the evaporator coil temp.T2 of the compressor just starts running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 ＜Tcool－2℃ does not keep continuous 4 seconds and this

situation happens 3 times, the display area will show “EC” and

AC will turn off.

Supposed causes

● T2 sensor faulty

● Indoor PCB faulty

● System problems, such as leakage or blocking.

Trouble shooting:

Check cool air blowing out from indoor air outlet

Yes

Check if T2 sensor

Check leakage of system

Power off, then restart the

unit 2 minutes later.

Replace indoor PCB.

Yes

Repair the leakage and

recharge the refrigerant.

Yes

check blockIng of system and

clear the blocking

Page 35

8.2.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5)

Error Code

E4/E5/F1/F2/F3

Malfunction decision conditions

If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.

Supposed causes

● Wiring mistake

● Sensor faulty

Trouble shooting:

Check the connection between temperature

sensor and PCB.

Correct the connectionNo

Yes

Replace indoor or outdoor

main PCB

Measure the resistance

value of the sensor

Repalce the sensorNo

Yes

Page 36

8.2.6 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0)

Error Code

Malfunction decision conditions

When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show “P0” and AC will turn off.

Supposed causes

● Wiring mistake

● IPM malfunction

● Outdoor fan ass’y faulty

● Compressor malfunction

● Outdoor PCB faulty

Trouble shooting:

Check the wiring between main PCB and compressor

Correct the connection or replace

the wires and connectors.

Yes

Check the IPM No

Yes

Replace the IPM board or replace

the main PCB

Check the outdoor fan and the

outdoor unit ventilation

Please refer to the solution of 【Fan

Speed Has Been Out Of Control】

malfunction

Yes

Check the compressor resistance

values

Replace the compressor.

Yes

Replace the outdoor main PCB

 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)

U N U V V

(+)Red

Page 37

8.2.7 Over voltage or too low voltage protection diagnosis and solution(P1)

Error Code

Malfunction decision conditions

An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit.

Supposed causes

● Power supply problems.

● System leakage or block

● PCB faulty

Trouble shooting:

Check the power supply

Check the connections and wires

Stop the unit

Yes

Correct the connections or

replace the wires.

Yes

Replace the reactor

Yes

Replace the IPM board

Check the voltage between P

and N

Check the reactor

Yes

Replace outdoor main PCB

Page 38

8.2.8 High temperature protection of compressor top diagnosis and solution(P2)

Error Code

Malfunction decision conditions

If the sampling voltage is not 5V, the LED will display the failure.

Supposed causes

● Power supply problems.

● System leakage or block

● PCB faulty

Trouble shooting:

Check the air flow system

of indoor and outdoor units

Clear up the air inlet and outlet or the heat

exchanger of indoor and outdoor units.

Yes

Power off, then restart the unit 10

minutes later

Check if the temperature

of compressor

Check refrigerant system

Yes

Check the overload

protector

Correct the connection.No

Measure the resistance

between the two ports of

the OLP. Is it zero?

Yes

Replace the OLP.

Replace the outdoor control PCB.

Yes

Page 39

8.2.9 Inverter compressor drive error diagnosis and solution(P4)

Error Code

Malfunction decision conditions

An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on.

Supposed causes

● Wiring mistake

● IPM malfunction

● Outdoor fan ass’y faulty

● Compressor malfunction

● Outdoor PCB faulty

Trouble shooting:

Check the wiring between main PCB and compressor

Correct the connection or replace

the wires and connectors.

Yes

Check the IPM No

Yes

Replace the IPM board or replace

the main PCB

Check the outdoor fan and the

outdoor unit ventilation

Please refer to the solution of 【Fan

Speed Has Been Out Of Control】

malfunction

Yes

Check the compressor resistance

values

No Replace the compressor.

Yes

Replace the outdoor main PCB

Page 40

Main parts check

1. Temperature sensor checking

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

Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.

Page 41

Appendix 1 Temperature Sensor Resistance Value Table (℃--K)

℃

K Ohm

℃

K Ohm

℃

K Ohm

℃

K Ohm

-20

115.266

12.6431

2.35774

100

0.62973

-19

108.146

12.0561

2.27249

101

0.61148

-18

101.517

11.5000

2.19073

102

0.59386

-17

96.3423

10.9731

2.11241

103

0.57683

-16

89.5865

10.4736

2.03732

104

0.56038

-15

84.2190

10.000

1.96532

105

0.54448

-14

79.3110

9.55074

1.89627

106

0.52912

-13

74.5360

9.12445

1.83003

107

0.51426

-12

70.1698

8.71983

1.76647

108

0.49989

-11

66.0898

8.33566

1.70547

109

0.48600

-10

62.2756

7.97078

1.64691

110

0.47256

-9

58.7079

7.62411

1.59068

111

0.45957

-8

56.3694

7.29464

1.53668

112

0.44699

-7

52.2438

6.98142

1.48481

113

0.43482

-6

49.3161

6.68355

1.43498

114

0.42304

-5

46.5725

6.40021

1.38703

115

0.41164

-4

44.0000

6.13059

1.34105

116

0.40060

-3

41.5878

5.87359

1.29078

117

0.38991

-2

39.8239

5.62961

1.25423

118

0.37956

-1

37.1988

5.39689

1.21330

119

0.36954

35.2024

5.17519

1.17393

120

0.35982

33.3269

4.96392

1.13604

121

0.35042

31.5635

4.76253

1.09958

122

0.3413

29.9058

4.57050

1.06448

123

0.33246

28.3459

4.38736

1.03069

124

0.32390

26.8778

4.21263

0.99815

125

0.31559

25.4954

4.04589

0.96681

126

0.30754

24.1932

3.88673

0.93662

127

0.29974

22.5662

3.73476

0.90753

128

0.29216

21.8094

3.58962

0.87950

129

0.28482

20.7184

3.45097

0.85248

130

0.27770

19.6891

3.31847

0.82643

131

0.27078

18.7177

3.19183

0.80132

132

0.26408

17.8005

3.07075

0.77709

133

0.25757

16.9341

2.95896

0.75373

134

0.25125

16.1156

2.84421

0.73119

135

0.24512

15.3418

2.73823

0.70944

136

0.23916

14.6181

2.63682

0.68844

137

0.23338

13.9180

2.53973

0.66818

138

0.22776

13.2631

2.44677

0.64862

139

0.22231

Page 42

2.Compressor checking

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

Position

Resistance Value

ASN98D22UFZ

ASM135D23UFZ

DA200S2C-10MT

Blue - Red

1.57Ω

(20℃/68℉)

1.75Ω

(20℃/68℉)

0.51Ω

(20℃/68℉)

Blue - Black

Red - Blue