Midea MS9A-09HR-QB6, MS9A-07CR-QB6, MS9A-09CR-QB6(A), MS9A-09CR-QC0, MS9A-09CR-QC4(A) Service Manual

...

Download

9ASAP-1301-A

SERVICE MANUAL

MIDEA AIRCONDITIONER

ASIA PACIFIC OCEAN MARKET

SPLIT WALL-MOUNTED TYPE

LUNA ON-OFF SERIES

CONTENTS

1. Precaution .................................................................................................................................................... 1

1.1 Safety Precaution .......................................................................................................................... 1

1.2 Warning ......................................................................................................................................... 1

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

3. Dimension .................................................................................................................................................... 9

3.1 Indoor Units ................................................................................................................................... 9

3.2 Outdoor Units .............................................................................................................................. 12

4. Refrigerant Cycle Diagram ....................................................................................................................... 14

5. Wiring Diagram .......................................................................................................................................... 16

5.1 Indoor Units ................................................................................................................................. 16

5.2 Outdoor Units .............................................................................................................................. 21

6. Installation details ...................................................................................................................................... 29

6.1 Wrench torque sheet for installation ........................................................................................... 29

6.2 Connecting the cables ................................................................................................................ 29

6.3 Pipe length and the elevat ion ..................................................................................................... 30

6.4 Installation for the fir st time ......................................................................................................... 31

6.5 Adding the refrigerant after running t he s ystem for many years ................................................ 34

6.6 Re-installation w hi le t he indoor unit need to be repaired ........................................................... 35

6.7 Re-installation w hi le t he outdoor unit need to be repaired ......................................................... 37

7. Operation characteristics ......................................................................................................................... 40

8. Electronic function .................................................................................................................................... 41

8.1 Abbreviation ................................................................................................................................ 41

8.2 Display function ........................................................................................................................... 41

8.3 Main Protection ........................................................................................................................... 42

8.4 Operation Modes and Functions ................................................................................................. 43

9. Troubleshooting ......................................................................................................................................... 52

9.1 Indoor unit error displa y .............................................................................................................. 52

9.2 Diagnosis and Solution ............................................................................................................... 54

1. Precaution

1.1 Safety Precaution

 To prevent injury t o t he us er or other people and property damage, the f ol lowing

instructions m us t be followed.

 Incorrect operation due to ignoring inst ruction will cause harm or damage.  Before service unit, be sure to read this service manual at first.

1.2 Warning

 Installation

 Do not use a defective or underr at ed 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 electr ic shock.

 Always ground t he product.

There is risk of fire or electric shock.

 Install the panel and the cover of control b ox securely.

There is risk of fire of electric shock.

 Always instal l a dedicated circuit and breaker.

Improper wiring or installation may cause fore or electric shock.

 Use the correctly rat ed breaker of f use.

There is risk of fire or electric shock.

 Do not modify or extend the power cable.

There is risk of fire or electr ic 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 injur y, be especially careful of the case edges and t he f ins on the

condenser and evaporator.

 For installation, always contact the dealer or an Authorized service center.

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

 Do not inst all the product on a defect i ve installation stand.

It may cause injury, accident, or damage to the product.

 Be sure the install ation area does not deteriorate with a ge.

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 lo ng time when the humidi ty is very high and a

door or a windo w is le ft open.

Moisture may condense and wet or damage furniture.

 Take care to ensure that power cable could not be pulled out or damag ed during

operation.

There is risk of fire or electric shock.

 Do not place any t hing 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 (operati on) the product with wet hands.

There is risk of fire or electric shock.

 Do not place a heater or other appliance near the power cable.

There is risk of fire and electr ic shock.

 Do not allow water to run into electric parts.

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

 Do not store or use flammable gas or combustible near the pro duc t .

There is risk of fire or failure of product.

 Do not use the pro duc t 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.

Do not use the telephone or t ur n sw it ches on or off.

There is risk of explosion or fire.

 If strange sound s , or s mall or smoke comes fr om product. Turn the breaker off or

disconnect the power supply cable.

There is risk of electric shock or fire.

 Stop operation and close the window in storm or hurrica ne . If possible, remove the

product from the window before the hurricane arrives.

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

 Do not open the inle t gril l of the produ ct duri ng o peratio n. (Do not to uch the el ectr ost at ic

filter, if the unit is so equipped.)

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

 When the product is soaked (flooded or submerged), 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 mai ntaining the pro duct.

There is risk of electric shock.

 When the product is not be used for a long t ime, disconnect the power supply plug or

turn off the breaker.

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

 T ake care to ensure that nobody could step on or fall onto the out door unit.

This could result in person al in jury and product damage.

 CAUTION

 Always check for gas (refri ger ant) leakage after installation or repair of product.

Low refrigerant levels may cause failure of product.

 Install the drain h ose t o ensure that water is drained away pr op er l y.

A bad connection may cause water leakage.

 Keep level even when installing the product.

It can avoid vibration of water leakage.

 Do not inst all the product wher e the noise or hot air from the outdoor unit could dama ge

the neighborho ods.

It may cause a problem for your neighbors.

 Use two or more people to l i ft and transport t he pr oduct.

Avoid personal injury.

 Do not install the product where it will be exposed to se a wind (salt spray) directly.

It may cause corrosion on the pr oduc t . Corr osion, particularly on the condenser and evaporator fins, could cause product malf unction or inefficient operation.

 Operational

 Do not expose th e sk i n directly to cool air f or long periods of time. (Do not sit in the

draft).

This could harm to your health.

 Do not use the product for special purp oses, such as preser ving foods, works of art, etc.

It is a consumer air conditioner, not a precisi on refrigerant system.

There is risk of damage or loss of property.

 Do not block the i nl e t or outlet of air flow.

It may cause product failur e.

 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 part s of the product.

 Do not touch the metal parts of the product when removing the air filter. They are very

sharp.

There is risk of personal injury.

 Do not step on or put anything on the product. ( outdoor units)

There is risk of personal injury and f ailure of product.

 Always insert the filt er securely. Clean the filter every two weeks or more often if

necessary.

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

 Do not insert hands or other object thro ugh air inlet or outlet whi l e t he product is

operated.

There are sharp and moving p ar ts that could cause personal injur y.

 Do not drink the water drained from the product.

It is not sanitary could ca use serious health issues.

 Use a firm stool or l a dder when cleaning or m a i ntaining the product.

Be careful and avoid pers onal injury.

 Replace the all batteries i n t he rem ote control with new ones of the same type. Do not

mix old and mew batteries or different types of batteries.

There is risk of fire or explosion.

 Do not recharge or disassemble the batteries. Do not dispose of batt er i es in a fire.

They may burn of explode.

 If the liquid from the batteries gets onto your skin or clothes, wash it wel l with clean

water. Do not use the remote of the batteries have leaked.

The chemical in batteries could cause burns or other health hazards

The designs, and information in this book are subject to change witho ut not ice for product improvement.

2. Function

Model Names of Indoor/Outdoor Units

Series Capacity Indoor units Outdoor units

On-Off

5k MS9A-05CR-QD0 MOK-05CP-QD0

MS9A-07CR-QB6 MOK2-07C-QB6

MS9A-07HR-QB6 MOK-07H-QB6

MS9A-09CR-QB6 MOK6-09C-QB6

MS9A-09HR-QB6 MOK3-09H-QB6

MS9A-09CR-QB6(A) MOK8-09C-QB6

MS9A-09CR-QB6 MOK9-09C-QB6

MS9A-09CR-QC0 MOB1-09C-QC0

MS9A-09CR-QC4(A) MOB1-09C-QC4

12k

MS9A-12CR-QC4(A) MOB2-12C-QC4

MS9A-12CR-QB6 MOA1-12C-QB6

MS9A-12CR-QB6 MOA2-12C-QB6

MS9A-12HR-QB4 MOA1-12H-QB4

MS9A-12HR-QB6 MOB-12H-QB6

MS9A-12HR-QB6 MOA2-12H-QB6

18k

MS9A-18CR-QB6 MOB-18C-QB6

MS9A-18HR-QB6 MOB-18H-QB6

MS9A-18CR-PC4W(A) MOF-18C-QC4W

MS9A-18CR-QC2

MOF-18C-QC2

MS9A-18CR-QB8

MOB3-18C-QB8

MS9A-18CR-QC4(A) MOF2-18C-QC4

MS9A-18CR-QC0(A) MOC2-18C-QC0

MS9A-18CR-QC0(A) MOB1-18CP-QC0

MS9A-18CR-QC0 MOB2-18CP-QC0

21k MS9A-21HR-QB6W MOF4-21H-QB6W

22k

MS9A-22CR-QC0 MOF-22C-QC0

MS9A-22CR-QB8 MOF-22C-QB8

24k

MA9A-24HR-QB4W MOF-24H-QB4

Filter

Ionizer+(O)

Ionizer(O)

Silver Ico Filter(O)

Vitamin C Filter(O)

3M HAM Filter(O)

Bio Filter(O)

Golden Fin(O)

Killer of Formaldehyde

Compressor Crankcase Heater(O)

Self Clean(O)

Follow me(O)

8 degree heating(O)

Heat compensation(O)

Self-diag. function

ydrophilic aluminum fin

Anti-rust cabinet

Valve protection cover

PTC Heating Belt(O)

O: optional function

3. Dimension

3.1 Indoor Units

Model W H D

MS9A-05CR-QD0

710 250 190

MS9A-07CR-QB6 MS9A-07HR-QB6

MS9A-09CR-QB6

MS9A-09HR-QB6

MS9A-09CR-QB6(A)

790 265 198

MS9A-09CR-QC0

MS9A-09CR-QC4(A)

MS9A-12CR-QB6

MS9A-12HR-QB4

MS9A-12HR-QB6

MS9A-12CR-QC4(A)

920 292 223

MS9A-18CR-QC0

MS9A-18CR-QB6

MS9A-18HR-QB6

MS9A-18CR-PC4W(A)

998 240 322

MS9A-18CR-QC2 MS9A-18CR-QB8

MS9A-18CR-QC4(A)

MS9A-18CR-QC0(A)

MS9A-21HR-QB6W

MS9A-22CR-QC0

MS9A-22CR-QB8

Model

R(mm)

L(mm)

H(mm)

Dimension of installation hole(mm)

MS9A-05CR-QD0

111.5 100 45

￠65

MS9A-07CR-QB6

MS9A-07HR-QB6

MS9A-09CR-QB6

MS9A-09HR-QB6

MS9A-09CR-QB6(A)

151

100 45

MS9A-09CR-QC0

MS9A-09CR-QC4(A)

MS9A-12CR-QB6 MS9A-12HR-QB4 MS9A-12HR-QB6 MS9A-18CR-QC2

118.5 100 45

MS9A-18CR-QB8 MS9A-18CR-QC4(A) MS9A-18CR-QC0(A)

MS9A-22CR-QC0

MS9A-22CR-QB8

MA9A-24HR-QB4W

Model R(mm) L(mm) H(mm) Dimension of installation hole(mm)

MS9A-12CR-QC4(A)

186.5

150 45

￠65

MS9A-18CR-QC0

MS9A-18CR-QB6

MS9A-18HR-QB6

MS9A-18CR-PC4W(A)

120

100

3.2 Outdoor Units

More than 30cm

More than 60cm

More than 70cm

More than 30cm

More than 60cm (Service space

Fence or

obstacles

Model

W D H

W1 A B

MOK-05CP-QD0

685 260 430 742 460 276

MOK2-07C-QB6

MOK-07H-QB6 MOK8-09C-QB6 MOK9-09C-QB6 MOK6-09C-QB6 MOK3-09H-QB6 MOA1-12C-QB6

700 240 540 757 458 250

MOA2-12C-QB6 MOA1-12H-QB4 MOA2-12H-QB6

MOB1-09C-QC0

780 250 540 843 549 276

MOB1-09C-QC4

MOB2-12C-QC4

MOB-12H-QB6

MOB-18C-QB6

MOB3-18C-QB8

MOB1-18CP-QC0 MOB2-18CP-QC0

MOB-18H-QB6

MOF-18C-QC4W

845 320 700 908 560 335

MOF-18C-QC2 MOF2-18C-QC4

MOF4-21H-QB6W

MOF-22C-QC0

MOF-22C-QB8

MOF-24H-QB4

MOC2-18C-QC0 760 285 590 823 530 290

4. Refrigerant Cycle Diagram

For cooling only models:

INDOOR OUTDOOR

LIQUID SIDE

GAS SIDE

HEAT EXCHANGE (EVAPORATOR)

HEAT EXCHANGE

(CONDENSER)

COMPRESSOR

CAPILIARY TUBE

For heat pump models:

INDOOR OUTDOOR

LIQUID SIDE

GAS SIDE

HEAT EXCHANGE (EVAPORATOR)

HEAT EXCHANGE (CONDENSER)

COMPRESSOR

2-WAY VALVE

3-WAY VALVE

CHECK VALVE (Heating Model only)

CAPILIARY TUBE

REVERSING VALVE (Heating Model only)

COOLING HEATING

ACCUMULATOR

5. Wiring Diagram

5.1 Indoor Units

MS9A-07CR-QB6, MS9A-09CR-QB6, MS9A-12CR-QB6

MS9A-07HR-QB6, MS9A-09HR-QB6, MS9A-12HR-QB4, MS9A-12HR-QB6, MS9A-18HR-QB6

MS9A-18CR-QB6

MS9A-18CR-PC4W(A)

MS9A-05CR-QD0, MS9A-09CR-QB6(A), MS9A-09CR-QB6, MS9A-09CR-QC0, MS9A-09CR-QC4(A)

MS9A-12CR-QC4(A), MS9A-18CR-QC0

MS9A-18CR-QC2, MS9A-18CR-QB8, MS9A-18CR-QC4(A), MS9A-18CR-QC0(A)

MS9A-21HR-QB6W, MA9A-24HR-QB4W

MS9A-22CR-QC0, MS9A-22CR-QB8

5.2 Outdoor Units

MOK2-07C-QB6 MOK6-09C-QB6 MOA1-12C-QB6 MOA2-12C-QB6

MOB-18C-QB6

MOK-07H-QB6 MOK3-09H-QB6 MOB-12H-QB6 MOA1-12H-QB4 MOA2-12H-QB6

MOK-05CP-QD0, MOK8-09C-QB6, MOK9-09C-QB6, MOB1-09C-QC0, MOB1-09C-QC4, MOB2-12C-QC4

MOF-18C-QC2, MOF2-18C-QC4

MOB3-18C-QB8, MOC2-18C-QC0, MOB1-18CP-QC0, MOB2-18CP-QC0

MOB-18H-QB6

MOF-18C-QC4W

MOF4-21H-QB6W

MOF-22C-QC0, MOF-22C-QB8

MOF-24H-QB4

6. Installatio n details

6.1 Wrench torque sheet for installation

Outside diameter Torque Additiona l t ightening torque

mm inch N.cm 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)

15.9 5/8 4500(459kgf.cm) 4700(479kgf.cm) Ф19 3/4 6500(663kgf.cm) 6700(683kgf.cm)

6.2 Connecting the cables

The power cord of connect should be selected according to the following s pecifications sheet.

Rated current of appliance Nominal cross-s ectional area (mm²)

>3 and ≤6 0.75

>6 and ≤10 1.0 >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.

6.3 Pipe length and the elevation

The pipe length and refrig er ant amount:

Model Connective pipe length Air purging Additional amount of refrigerant

All Less than 5m Use vacuum pump ------------------

7k,9k,12k,18k(except

MS9A-18CR-PC4W(A))

More than 5m Use vacuum pump (Pipe length – 5) × 30g/m

MS9A-18CR-PC4W(A)

More than 5m Use vacuum pump (Pipe length – 5) × 60g/m

MS9A-21HR-QB6W MS9A-22CR-QC0 MS9A-22CR-QB8 MA9A-24HR-QB4W

Model

Standard

length

(m)

Max.

Elevation

B (m)

Max.

Length

A (m)

7k,9k,12k 5 5 10

18k 5 8 15

21k,22k,24k 5 10 20

Caution:

The capacity test is based on the standard length an d the maximum permissive length is based on the system reliability. The oil trap should be inst all ed per 5-7 meters. .

6.4 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 corrosi on 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 an d m oisture 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 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 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 vacuum pump.

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

(Indoor unit)

(Liquid side)

(Gas side)

Vacuum

pump

Vacuum

pump

Handle Hi

Two-way valve

Manifold valve

Compound meter

Pressure

gauge

-0.1MPa

Handle Lo

Charge hose

(Outdoor unit)

Three

-way valve

the meter does not indicate -0.1Mpa after pum ping 30 minutes, it should be pumped 20 minutes more. If the pressure can’t achi eve -0.1Mpa after pum ping 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° counterclo ckwise for 6 or 7seconds after the gas coming out, then tighten the flare nut again. Ma ke sure the pressure display in the pressure indic ator is a little higher than the atmosph er e pr essure. Then remove the c har ge 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 positi on.

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. Purge the air by loosening the flare nut on the 2-way valve approximately 45’ for 3 seconds the n closing it for 1 minute; repeat 3 times. After purging the air, use a torque wrench to tight en 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 approximatel y 45’ until the gauge indicates 0.3 to 0.5 Mpa.

6). Disconnect the charg e set and th e char gi ng cyli nder, and set the 2-way and 3-way valves to t he 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 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 t he c har ging cylinder , open t he 2-way valve and the 3-way valve. Connect the charge hose w hich y ou disco nnecte d fr om the v acuu m pu mp to the v alve at the bot tom 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 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 system with l i qui d r efrigerant.

Electronic scale

6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose from the 3-way valve’ s ser vice port immediately and turn off the air con diti oner 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 lea kage.

6.5 Adding the refrigera nt after running the system for many years

Procedure:

1). Connect the charge hose to t he 3-way service port, open the 2-way valv e and t he 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 recor d 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 system with l i qui d r efrigerant.

Electronic scale

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 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 tight en the service port cap to a torque of 18N.m. Be sure to check for gas lea kage.

6.6 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 i n t he 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 ma ni fold valve slightly to purge air from the c harge 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 gauge indi cat es 0.1MPa.

6). Set the 3-way valve to the closed position immediately. Do this quickly so that the gaug e 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 tight en t he 3-way valves service port cap to a torque o f 18N.m. Be sure to check for gas lea kage.

2. Air purgi ng by the refrigerant

Procedure:

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

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

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 approximatel y 45’ until the gauge indicates 0.3 to 0.5 Mpa.

6). Disconnect the charg e set and th e char gi ng cyli nder, and set the 2-way and 3-way valves to t he 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 18N . m.

Be sure to check the gas leakage.

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

1. Evacuation for the whole sy stem

Procedure:

1). Confirm that both the 2-w ay 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 ind icate s -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 (appr oximately 5 minutes after tur ning off the vacuum pump).

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

2. Refrigerant charging

Procedure:

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 t he w eight.

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

5).When the electronic scale displays the proper weight, disconnect t he charge hose from the 3-way valve’s service port immediately. If the system has been charged with liqu id refriger ant while oper ating the air conditioner, turn off the air conditioner before disconnecting the hose.

Electronic scale

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 leakage.

7. Operation characteristics

CAUTION:

1. If air conditioner is used outside o f t he above conditions, certain safety protection feat ures may

come into operation and cause t he unit to function abnormally.

2. Room relative humid ity less tha n 80%. I f the air c onditioner operat es in exce ss of 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. Optimum performance w ill be achieved within this operating temperature.

8. Electronic function

8.1 Abbreviation

T1: Indoor ambient temperature T2: Coil temperature of indoor heat exc hanger T3: Coil temperature of out door heat exchanger T4: Outdoor ambient temperature T5: Compressor discharge temperat ure

8.2 Display function

8.2.1 Icon explanation on indoor display board.

Run indication lamp: This lamp illuminates when the air conditioner is in operation.

Auto indication lamp: Lights up during the Auto operation.

Ion indication lamp:

Illuminate when Ionizer/Plasma function is

activated.

Timer indication lamp: Lights up during T imer operation.

Defrost indication lamp(only for heat pump models): This indicator

illuminates when the air conditioner starts defrosting automatically or

when the anti-cold wind function is activ ated in heating operation. DIGITA L DISPLAY indication lamp: Displays current set ting temper atur e or malfunction codes whe n t he air c onditioner is in operation.

8.3 Main Protection

8.3.1 Time Delay at restart for compressor.

8.3.2 Fan Spe ed is out of control.(except MS9A-21HR-QB6W and MA9A-24HR-QB4W models)

----When Indoor Fan Speed keeps too low or too high for certain time, the unit will stop and the LED will display the failure

8.3.3 Current protection

I3SEC

I5MIN

Resume

IFAN

IRESTORE

A zone : The current exceeds I

3SEC

for 5 seconds, the compressor and outdoor fan will shut of f.

B zone: The current exceeds I

5min

for 5 minutes, the compressor and outdoor fan will shut off.

C zone: The current exceeds I

FAN

, the outdoor fan will shut off if AC is in heating mode. If AC is in

cooling mode, the indoor fan w il l run at low speed.

8.3.4 Zero crossing detection error protection(except MS9A-21HR-QB6W and MA9A-24HR-QB4W models)

If AC can not detect zero crossing signal for 4 minutes or the zero crossing signal time interval is not correct, the unit will stop and the LED will display the failure. The correct zero crossing signal time interval should be betwee n 6-13ms.

8.4 Operation Modes and Functions

8.4.1 Fan mode.

(1) Outdoor fan and co mp r essor st op. (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 cooli ng mode.

(5) Auto fa n:

8.4.2 Cooling Mode

8.4.2.1 Compressor running rules:

Once the compressor star ts up, it will follow the below rules: When indoor room temp.T1 is lower than Tn, the compr ess or and outdoor fan will shut of f. When T1 is higher than Tm, the compressor and out door fan will start up.

Tm=Ts+1, Tn=Ts-1 for MS9A-18CR-PC4W(A), MS9A-18CR-QB8, MS9A-18CR-QC0(A), MS9A-18CR-QC2, MS9A-18CR-QC4(A), MS9A-22CR-QB8, MS9A-22CR-QC0, MS9A-21HR-QB6W, MA9A-24HR-QB4W models. Tm=Ts, Tn=Ts-2 for MS9A-09CR-QC4(A), MS9A-12CR-QC4(A), MS9A-18CR-QC0 models. Tm=Ts+1, Tn=Ts for other models.

8.4.2.2 Outdoor fan running rules:

The outdoor units have single fan speed. The outdoor fan will run following the compressor except

when AC is in evaporator high temp. protection in heating mode ,defrosting mode and the current protection.

8.4.2.3 Indoor fan running rules

In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low and auto.

8.4.2.4 Evaporator low temperature T2 protection.

When the evaporator coil temp.T2 keeps lower than TE5 for 5 minutes, the compressor and outdoor fan will shut off. When T2 is higher than TE6, the compressor and outdoor fan will restart up.

8.4.3 Heating Mode(for heat pump models)

8.4.3.1 Compressor running rules:

Once the compressor starts up, it will follow the below rules: When indoor room temp.T1 is higher than Tj, the compressor and outdoor fan will shut off. When T1 is lower than Tk, the compressor and outdoor fan will start up.

Tj=Ts+Tc

Tk=Ts+Tc-1.

8.4.3.2 Outdoor fan running rules:

The outdoor units have single fan speed. The outdoor fan will run following the compressor except when AC is in evaporator high temp. protection in heating mode ,defrosting mode and the current protection.

8.4.3.3 Indoor fan running rules:

Indoor fan can be set to high/med/low/auto when the compressor is on. And when the compressor is off, the indoor fan will run at low speed and the louver will locate at the anti cold wind angle.

Anti-cold wind function:

When evaporator coil tem p. T2 is g et ting higher, T2>TE2, the indoor fan wi ll run at setting speed. TE1<T2<TE2, the indoor fan w il l run at low speed. When T2 is getting lower, TE4<T2<TE3,the indoor f an w il l run at low speed. T2<TE4, the indoor fan will shut off.

Auto fan action :

When T1-Ts>2℃,the indoor fan will run at low speed. When T1-Ts≤0℃, the indoor fan will run at medium speed.

8.4.3.4 Defrosting mode： For MS9A-21HR-QB6W and MA9A-24HR-QB4W models:

 Condition of defrosting:

AC will enter defrosting mode if any of the following items is satisfied. (1) When T3＜TC1℃, if the compressor keeps running over 45 minutes and T3＜TC3℃ for 3

minutes. (2) After the last defrosting, the time that the outdoor fan is off but the compressor is on in high T2 protection cumulates up to 90 m in ut es .

 Condition of defrosting stop:

If any one of the following items is satisfied, the defrosting will terminate and the machine will turn to normal heating mode. (1)T3 rises to be higher than TC2. (2)The machine has run for 10 minutes in defrosting.

 Defrosting action：

For other models:

 Condition of defrost i ng:

AC will enter defrosting mode if any of the following it e ms is satisfied. (1) Both A an d B are s atisfied

A: The compressor keeps running for 40 minutes.

B: The evaporator coil temp.T2-Indoor room temp.T1 meets the below table.

℃

T2－T1

High speed

＜TH

DEFROST

Medium speed

＜TM

DEFROST

Low speed

＜TL

DEFROST

Breeze/off No need to compare the T2 and T1

(2) After the last defrosting, the time that the outdoor fan is off but the compressor is on in high T2

protection cumulates up to 90 m inutes.

 Condition of endin g defrosting:

If any one of the following items is satisfied, the defrosting will terminate and the machine will turn to normal heating mode. (1) The defrosting time is reached to the setting value. (2) The compressor current reaches or exceeds I

DEFROST

for 7 seconds.

 Defrosting action

：

About the setting defrosting time:

(1) Condition 1 of defrosting; If case B happens before case A and lasts till case A happen s, the set ting defrosting ti me is 10 minutes. Otherwise the defrosting t ime is 7.5 minutes. (2) Condition 2 of defrosting. The defrosting time is 10 m inutes. (3) No matter what c onditio n of defrost ing is, if the d efro sting time keeps 7.5 minutes for 3 times, it w ill be 10 minutes in the 4

defrosting.

8.4.3.5 High evaporator coil temp.T2 protection:

8.4.4 Auto-mode

The machine will choose coolin g, heat ing or fan-only mode according to ΔT (ΔT =T1-Ts). For MS9A-09CR-QC4(A), MS9A-12CR-QC4(A), MS9A-18CR-QC0 models:

ΔT=T1-Ts Running mode ΔT＞2℃

Cooling

-3≤ΔT≤2℃

Fan-only

ΔT<-3℃

Heating (for cooling only models, they will run at fan-only mode)

For other models:

ΔT=T1-Ts Running mode ΔT＞2℃

Cooling

-1≤ΔT≤2℃ Fan-only ΔT<-1 ℃ Heating

(for cooling only models, they

will run at

fan-only mode)

AC will run in auto mode in the below cases:

（1） Press the forced auto button. （2） If AC is off, it will run in au t o mod e when timer on function is active. （3） After setting the mode, AC will run in auto mode if the compressor keeps n ot r unning for 15

minutes(20 minutes for MS9A-09CR-QC4(A), MS9A-12CR-QC4(A), MS9A-18CR-PC4W(A), MS9A-18CR-QB8, MS9A-18CR-QC0, MS9A-18CR-QC0(A), MS9A-18CR-QC2, MS9A-18CR-QC4(A), MS9A-22CR-QC0, MS9A-22CR-QB8).

8.4.5 Drying mode

8.4.5.1 The indoor fan will run foll owin g the co mpres sor. If the compressor is on ,the indoor fan will run at low speed. If the compressor i s off, the indoor fan will run at bre eze. Running rules:

Condition

Indoor fan

Compressor

1 T1 ≥ TS+2

Low

Breeze

ON 6 minutes OFF 4 minutes

TS ≤T1＜TS+2

Low

Breeze

ON 5 minutes OFF 5 minutes

T1 ＜ TS

Low

Breeze

ON 4 minutes OFF 6 minutes

8.4.5.2 In drying mode, if room temperature is lower t han 10 ℃, the indoor fan will run at breeze w hile the compressor and out door fan will stop and not resume unti l room temperature exceeds 13 ℃.

8.4.5.3 For MS9A-18CR-PC4W(A) model, MS9A-18CR-QB8, MS9A-18CR-QC0(A) , MS9A-18CR-QC2 ,MS9A-18CR-QC4(A), MS9A-21HR-QB6W,MS9A-22CR-QB8 , MS9A-22CR-QC0 , MA9A-24HR-QB4W models, the indoor fan speed will keep at low speed and all the protection is the same as the cooling mode.

8.4.5.4 For MS9A-09CR-QC4(A), MS9A-12CR-QC4(A), MS9A-18CR-QC0 models, the compressor is cycled running with 10 minutes on and then 5 minutes off. The indoor fan will keep running at low speed.

8.4.5.5 The system protection is active in this mo de.

8.4.6 Forced oper a t ion function

Press the touch button continually, the AC will run as below sequence:

Forced auto →Forced cooling →Off

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 drying mode(auto mode for MS9A-09CR-QC4(A), MS9A-12CR-QC4(A), MS9A-18CR-PC4W(A), MS9A-18CR-QB8, MS9A-18CR-QC0, MS9A-18CR-QC0(A), MS9A-18CR-QC2, MS9A-18CR-QC4(A), MS9A-21HR-QB6W, MS9A-22CR-QB8, MS9A-22CR-QC0 , MA9A-24HR-QB4W models) 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 sett ing ,follow me setting, it will quit the forced o per at io n.

8.4.7 Timer function

8.4.7.1 Timing range is 24 hours.

8.4.7.2 Timer on. The machine will turn on automatically when reaching the setting time.

8.4.7.3 Timer off. The machine will turn off automatically when reaching the setting time.

8.4.7.4 Timer on/off. The machine will turn on automatically when reaching the setting “on” time, and then turn off automat ically when reaching the setting “off” time.

8.4.7.5 Timer off/on. The machine will turn off automatically when reaching the setting “off” time, and then turn on automatically w hen r eaching the setting “on” time.

8.4.7.6 The timer function will not change th e AC cur rent operat ion mode. Suppose AC is off now, it will not start up firstly after setting the “timer off” function. And when reaching the setting time, the timer LED will be off and the AC running mode has not been changed.

8.4.7.7 The setting ti me is relative time.

8.4.8 Sleep funct ion mode

8.4.8.1 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and turns off.

8.4.8.2. Operation process in sleep mode is as follow: After pressing ECONOM IC or SLEEP button on cont r oller, the machine will turn into sleep mode. When cooling, the setting temperature rises 1 ℃

(be lower th

setting temperature stops rising and indoor fan is fixed as low speed. For heat pump models, when they are in heating, the setting temperature decreases 1℃(be higher than 17 ℃

) every one

low speed.(Anti-cold wind fun c t io n has t he priority)

8.4.8.3 Timer setting is available

8.4.8.4 When user uses timer off function in sleep mode(or sleep function in timer off mode), if the timing is less than 7 hours, sleep function wil l be cancelled wh en reachi ng the sett ing time. I f the timing is more than 7 hours, the mach ine w i ll n ot s t op unt i l reaches the setting time in sleep mode.

8.4.9 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 m inutes when power returns. If the memorization condition is forced cooling mode, the unit will run in cooling mode for 30 minutes and turn to drying mode with 24 ℃ se tting temp. If AC is off before power off and AC is required to start up now, the compressor will have 20 seconds delay when power on. If AC is on before power off and AC is required to start up now, the compressor will have 3 minutes delay when power on.

9. Troubleshooting

9.1 Indoor unit error display

For MS9A-18CR-QB8, MS9A-18CR-QC2, MS9A-18CR-QC0(A),MS9A-18CR-PC4W(A), MS9A-18CR-QC4(A), MS9A-22CR-QB8, MS9A-22CR-QC0 models:

Display LED STATUS

E1 EEPROM error E2 Zero crossing signal detection error E3 Indoor fan speed has been out of control E5 Open circuit or short circuit of room temperature sensor E6 Evaporator temperature sensor open circuit or short circuit

For MS9A-05CR-QD0, MS9A-09CR-QB6(A), MS9A-09CR-QB6

Display LED STATUS

E1 EEPROM error E2 Zero crossing signal detection error E3 Indoor fan speed has been out of control E4 Over current protection occurs 4 times E5 Open circuit or short circuit of room temperature sensor E6 Evaporator temperature sensor open circuit or short circuit

For MS9A-21HR-QB6W and MA9A-24HR-QB4W models:

Display LED STATUS

E1 EEPROM error E4 Over current protection occurs 4 times E5 Indoor room temperature sensor open circuit or short circuit E6 Evaporator coil temperature sensor open circuit or short circuit E7 Condenser coil temperature sensor open circuit or short circuit E9 Indoor / outdoor units communication error

For other models:

Operation lamp

Timer lamp

Failure

☆

X Indoor fan speed has been out of co nt r ol

☆

The T1 or T2 sens or is open circuit or short circuit

X ☆

Over current protection occurs 4 times(except

MS9A-09CR-QC4(A), MS9A-12CR-QC4(A),

MS9A-18CR-QC0)

O ☆ EEPROM error

☆

Zero crossing signal dete ction error

O（light） X（off） ☆（flash）

9.2 Diagnosis and Solution

9.2.1 EEPROM parameter error diagnosis and solution

If the EEPROM chip is welded on main PCB, replace the main PCB directly. Otherwise, check whether the EEPROM chip plugged in main PCB well?

Yes

Correct the connection.

Replace the indoor main

PCB.

Shut off the power supply and

turn it on 5 seconds later. Is it

still displaying the error code?

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

9.2.2 Zero crossi ng detection error diagnosis and solution

Check if the connections and

power supply is normal?

Correct the connections. Turn on the unit when the power supply is good.

Yes

Indoor main PCB is

defective. Replace indoor

main PCB.

9.2.3 Indoor fan speed h as been out of control diagn osis and solution

Shut off the power supply

and turn it on 5 seconds later. Is it still displaying

the error code?

Shut off the power supply, rotate the fan by hand. Does it rotate properly?

The unit operates normally.

Find out the cause and

have it solved. For

example, check

whether the fan is

blocked or the bearing

is broken?

Check the wires of fan

motor. Are all the

connections good?

Yes

Correct the connections.No

Yes

Check whether the main PCB is

normal through index 2?

Yes

Check whether the fan

motor is normal through

index 1?

Yes

Replace the fan

motor

Replace the

main PCB.

The

malfunction is

solved?

If the

malfunction is

still existing,

replace the

main PCB

Index 1:

1.Indoor AC Fan Motor Measure the resistanc e value of each winding by using the tester.

Index2: 1:Indoor AC Fan Motor Power on and set the unit running in fan mode at high fan speed. After running for 15 second s, 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 t o be r eplaced.

9.2.4 Open circuit or shor t ci r cui t of t em perature sensors diagnos i s and solution

Check the connections

between temperature sensor and PCB. Are

the connections good?

Correct the connections.

Yes

Replace indoor or outdoor PCB.

Replace the sensor and check if the problem happen again?

Check the resistance value of the sensor via table1 and table 2, is it normal?

9.2.5 Over current protection occurs 4 times diagnosis and solutio n

Correct the operation condition.

Check if the voltage of the power supply is too low

Yes

Repair the power supply.

Is the outdoor operation temperature too high? Does the outdoor unit has bad air circulation?

Yes

Check if the outdoor fan can run properly?

Correct the connection of fan motor or replace the fan motor.

Yes

Check if the compressor is normal running

Replace the compressor

Yes

Replace the capillary. Evacuate the system and recharge refrigerant.

Disconnect with the power and replace the main PCB. Turn on the units and check if the problem remains

9.2.6 Indoor / outdoor units communication error diagnosis and soluti on

Yes

Measure Vs, is it moving alternately between positive value and negative value? (Vs is the voltage between S and N of outdoor unit.)

Yes

Power off, then turn on the unit 5 seconds later(reconnect the power wire).Is the error still displaying after several minutes?

Yes

Change the outdoor main PCB.

Power on. Is the error extinguished?

Check all the wirings between indoor and outdoor, indoor main PCB and outdoor main PCB following the wiring diagram. Are all the wirings connected correctly?

Is the wiring to the indoor main PCB connected correctly?

Change the indoor main PCB.

Yes

Change the outdoor main PCB.

Is the wiring to the outdoor main PCB connected correctly?

Power on. Is the error extinguished?

Change the indoor main PCB.

Main parts check

1. T emperat ur e sen sor che cking Disconnect the temperature sensor from PCB, measure the resistance value with a tester.

Temperature Sensors. Room temp.(T1) sen sor, 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.

Table1:Some frequently-used R-T data for T 1,T 2,T3 and T4 sensor:

Temperature (℃) 5 10 15 20 25 30 40 50 60 Resistance Value (KΩ) 26.9 20.7 16.1 12.6 10 8 5.2 3.5 2.4

Table 2:Some frequently-used R-T data for T5 sensor:

Temperature (℃) 5 15 25 35 60 70 80 90

100

Resistance Value (KΩ) 141.6 88 56.1 36.6 13.8 9.7 6.9 5 3.7

Resistance value (KΩ)

Temperature (℃)

T1,T2,T3,T4

Midea MS9A-09HR-QB6, MS9A-07CR-QB6, MS9A-09CR-QB6(A), MS9A-09CR-QC0, MS9A-09CR-QC4(A) Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual