Midea MS9A-11HRN1-QB8, MS9A-09HRN1-QB8, MS9A-07HRN1-QC2, MS9A-12HRN1-QC2, MS9A-09HRN1-QB6 Service Manual

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LUNA ON-OFF SERIES

Service Manual 2014

9ASEU-B1-1401

CONTENTS

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

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

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

2. Function ........................................................................................................................................................ 5

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

3.1 Indoor Units ................................................................................................................................... 7

3.2 Outdoor Units .............................................................................................................................. 10

4. Refrigerant Cycle Diagram ....................................................................................................................... 12

5. Wiring Diagram .......................................................................................................................................... 13

5.1 Indoor Units ................................................................................................................................. 13

5.2 Outdoor Units .............................................................................................................................. 17

6. Installation details ...................................................................................................................................... 22

6.1 Wrench torque sheet for installation ........................................................................................... 22

6.2 Connecting the cables ................................................................................................................ 22

6.3 Pipe length and the elevat ion ..................................................................................................... 23

6.4 Installation for the fir st time ......................................................................................................... 24

6.5 Adding the refrigerant after running t he s ystem for many years ................................................ 27

6.6 Re-installation w hi le t he indoor unit need to be repaired ........................................................... 28

6.7 Re-installation w hi le t he outdoor unit need to be repaired ......................................................... 30

7. Operation characteristics ......................................................................................................................... 33

8. Electronic function .................................................................................................................................... 34

8.1 Abbreviation ................................................................................................................................ 34

8.2 Display function ........................................................................................................................... 34

8.3 Main Protection ........................................................................................................................... 35

8.4 Operation Modes and Functions ................................................................................................. 36

9. Troubleshooting ......................................................................................................................................... 47

9.1 Indoor unit error displa y .............................................................................................................. 47

9.2 Diagnosis and Solution ............................................................................................................... 48

1. Precaution

1.1 Safety Precaution

 To prevent injury t o t he us er or other people and pr operty damage, the f ollowing

instructions m us t be followed.

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

1.2 Warning

 Installation

 Do not use a defective or underrate d ci r cui t 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 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 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.  Do not inst all the product on a def ective installation stand.  Be sure the install ation area does not deteriorate with a ge.

If the base collapses, the air conditioner could fall with it, causing pr operty 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.

 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 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 (operation) the product with wet hands.  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 electrical 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 flammabl e gas leaks, turn off the gas and open a window for ventilation before

turn the product on.

 If strange sound s or smoke comes from product, turn the breaker off or disconnect the

power supply cable.

There is risk of electric shock or fire.

 Stop operation and close t he window in storm or hurr icane. If possible, re m ove 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, 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 t ogether with a stove etc.

There is risk of fire or electric shock.

 Turn the main power off when cleaning or maintaining the pr oduct.

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 install the product where the nois e or hot air from the outdoor uni t could damage

the neighborho ods.

It may cause a problem for your neighbors.

 Use two or more people to lift and t r ansport the product.  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 malfunction or inefficient operati on.

 Operational

 Do not expose th e sk i n directly to cool air f or long time. (Do not sit in the draft).  Do not use the product for special purposes, such as preservi ng 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 the 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 part s 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 p ut anything on the product . (outdoor units)  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 malfun c t ion or damage.

 Do not insert hands or other object s through air inlet or out let while the product i s

operated.

 Do not drink the water drained from the product.  Use a firm stool or ladder when cleanin g or m a i ntaining the pr oduct.

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 new batteries or different types of batteries.

There is risk of fire or explosion.

 Do not recharge or disassemble the bat t e r i e s. Do not dispose of batteries in a fire.

They may burn of explode.

 If the liquid from t he batteries gets onto your skin or clothes, wash it well with clean

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

2. Function

Model Names of Indoor/Outdoor Units

Series Capacity Indoor units Outdoor units

On-Off

MS9A-07HRN1-QB6 MOK-07HN1-QB6 MS9A-07HRN1-QB6 MOK1-07HN1-QB6 MS9A-07HRN1-QC2 MOK1-07HN1-QC2

MS9A-09HRN1-QB6 MOK1-09HN1-QB6

MS9A-09HRN1-QB8 MOK-09HN1-QB8 MS9A-09HRN1-QC2 MOA1-09HN1-QC2 MS9A-09HRN1-QC2 MOA3-09HN1-QC2

MS9A-09HRN1-QC7G MOB1-09HN1-QC7

11k MS9A-11HRN1-QB8 MOA-11HN1-QB8

12k

MS9A-12HRN1-QC2 MOB1-12HN1-QC2

MS9A-12HRN1-QC2 MOB3-12HN1-QC2

MS9A-12HRN1-QC7G MOB-12HN1-QC7

16k

MS9A-16HRN1-QB8(A) MOB1-18HN1-QB6

MS9A-16HRN1-QB6 MOB3-16HN1-QB6

17k MS9A-17HRN1-QC0 MOC-17HN1-QC0

18k

MS9A-18HRN1-QC0 MOC-18HN1-QC0

MS9A-18HRN1-QB6 MOB1-18HN1-QB6

MS9A-18HRN1-QC5 MOF3-18HN1-QC5

24k

MS9A-24HRN1-QB8W MOP-24HN1-QB8W

MS9A-24HRN1-QB8W MOF1-24HN1-QB8W

Filter

Ionizer+(O)

Ionizer(O)

Silver Ico Filter(O)

Vitamin C Filter(O)

3M HAM Filter(O)

Bio Filter(O)

Golden Fin(O)

Cold catalyst filter

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 D H

MS9A-07HRN1-QB6

710 190 250

MS9A-07HRN1-QC2

MS9A-09HRN1-QC2

MS9A-09HRN1-QB8

MS9A-09HRN1-QB6

MS9A-09HRN1-QC7G

790 198 265

MS9A-11HRN1-QB8

MS9A-12HRN1-QC2

MS9A-16HRN1-QB8(A)

MS9A-12HRN1-QC7G

920 223 292

MS9A-16HRN1-QB6

MS9A-17HRN1-QC0

MS9A-18HRN1-QB6

MS9A-18HRN1-QC0

MS9A-18HRN1-QC5

998 240 322

MS9A-24HRN1-QB8W

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

MS9A-07HRN1-QB6

110 100 45

￠65

MS9A-07HRN1-QC2 MS9A-09HRN1-QB6

MS9A-09HRN1-QB8

MS9A-09HRN1-QC2

MS9A-09HRN1-QC7G

150 100 45

MS9A-11HRN1-QB8 MS9A-12HRN1-QC2

MS9A-16HRN1-QB8(A)

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

MS9A-18HRN1-QC5

120

100 45

￠65

MS9A-24HRN1-QB8W

Model

R(mm)

L(mm)

H(mm)

Dimension of installation hole( m m)

MS9A-12HRN1-QC7G

185

150 45

￠65

MS9A-16HRN1-QB6

MS9A-17HRN1-QC0

MS9A-18HRN1-QB6

MS9A-18HRN1-QC0

3.2 Outdoor Units

More than 30cm

More than 60cm

More than 200cm

More than 30cm

More than 60cm (Service space)

Fence or

obstacles

Model

W D H

W1 A B

MOK-07HN1-QB6

685 260 430 742 460 276

MOK1-07HN1-QB6

MOK1-07HN1-QC2

MOK1-09HN1-QB6

MOK-09HN1-QB8

MOA1-09HN1-QC2

700 240 540 757 458 250

MOA3-09HN1-QC2

MOA-11HN1-QB8

MOB1-09HN1-QC7

780 250 540 843 549 276

MOB-12HN1-QC7

MOB3-16HN1-QB6

MOB1-12HN1-QC2

MOB3-12HN1-QC2

MOB1-18HN1-QB6

MOC-17HN1-QC0

760 285 590 823 530 290

MOC-18HN1-QC0

MOP-24HN1-QB8W

820 330 595 870 523 340

MOF3-18HN1-QC5

845 320 700 908 560 335

MOF1-24HN1-QB8W

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

T3 Condenser temp. sensor

ACCUMULATOR

INDOOR OUTDOOR

CHECK VALVE (Heating Model only)

CAPILIARY TUBE

T3 temp. sensor i s only for 21k,24k models.

5. Wiring Diagram

5.1 Indoor Units

MS9A-07HRN1-QB6, MS9A-07HRN1-QC2, MS9A-09HRN1-QB6, MS9A-09HRN1-QB8, MS9A-09HRN1-QC2, MS9A-09HRN1-QC7G, MS9A-11HRN1-QB8, MS9A-12HRN1-QC2, MS9A-16HRN1-QB6,MS9A-16HRN1-QB8(A),MS9A-17HRN1-QC0, MS9A-18HRN1-QB6

，

MS9A-18HRN1-QC0

MS9A-12HRN1-QC7G

MS9A-18HRN1-QC5

MS9A-24HRN1-QB8W

5.2 Outdoor Units

MOK-07HN1-QB6, MOK1-07HN1-QB6,MOK1-07HN1-QC2, MOK1-09HN1-QB6, MOK-09HN1-QB8, MOA1-09HN1-QC2, MOA3-09HN1-QC2, MOB1-09HN1-QC7, MOA-11HN1-QB8,MOB-12HN1-QC7, MOB3-12HN1-QC2, MOB1-12HN1-QC2, MOB3-16HN1-QB6, MOB1-18HN1-QB6

MOC-17HN1-QC0

MOC-18HN1-QC0, MOF3-18HN1-QC5

MOP-24HN1-QB8W

MOF1-24HN1-QB8W

6. Installatio n details

6.1 Wrench torque sheet for installation

Outside diameter Torque Additional tightening 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-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 determ ined 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

Pipe size

Standard

length

(m)

Max.

Elevation

B (m)

Max.

Length

A (m)

Additional

refrigerant

(g/m)

Gas Liquid

MS9A-07HRN1-QB6+MOK-07HN1-QB6

3/8’’

(Ф9.52)

1/4’’

(Ф6.35)

5 8 20 20

MOK1-07HN1-QB6+MOK1-07HN1-QB6 MS9A-07HRN1-QC2+MOK1-07HN1-QC2 MS9A-09HRN1-QB6+MOK1-09HN1-QB6 MS9A-09HRN1-QB8+ MOK-09HN1-QB8 MS9A-09HRN1-QC2+MOA1-09HN1-QC2 MS9A-09HRN1-QC2+MOA3-09HN1-QC2 MS9A-09HRN1-QC7G+ MOB1-09HN1-QC7 MS9A-12HRN1-QC2+MOB1-12HN1-QC2 MS9A-11HRN1-QB8+MOA-11HN1-QB8

1/2’’

(Ф12.7)

1/4’’

(Ф6.35)

5 8 20 20

MS9A-12HRN1-QC2+MOB3-12HN1-QC2 MS9A-12HRN1-QC7G+ MOB-12HN1-QC7

MS9A-18HRN1-QB6+MOB1-18HN1-QB6 MS9A-16HRN1-QB6+MOB3-16HN1-QB6

MS9A-16HRN1-QB8(A)+ MOB1-18HN1-QB6

MS9A-17HRN1-QC0+MOC-17HN1-QC0

MS9A-18HRN1-QC0+ MOC-18HN1-QC0

1/2’’

(Ф12.7)

1/4’’

(Ф6.35)

5 10 25 20

MS9A-18HRN1-QC5+MOF3-18HN1-QC5

MS9A-24HRN1-QB8W+MOP-24HN1-QB8W

5/8’’

(15.9)

3/8’’

(Ф9.52)

5 10 25 40

MS9A-24HRN1-QB8W+MOF1-24HN1-QB8W

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 c apillary tubing.

● Water may lead to corrosi on of parts in the refrigerant sys t em.

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 lea ka ge.

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

0.1M

Handle Lo

Charge hose

Charge h

ose

(Outdoor unit)

Three

-way valve

the meter does not indicate -0.1Mpa after pum ping 30 minutes, it should be pump ed 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° counterclockwise for 6 or 7seconds after the gas coming out, then tighten the flare nut again. Ma ke sure the pressur e display in the pressure in dicator 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 charge set and t he char gin g cy linder, and set the 2-way and 3-way valves to the ope n position. Be sure to use a hexagonal wrenc h t o 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 r ecord the weight.

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

5) Open the valves (Low side) on the charge set and charge the system with l i qui d r efrigerant.

Electronic scale

6).When the electronic scale displays the proper weight (refer to the table), disconnect the char ge 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 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 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 wit h l i quid refrigerant.

Electronic scale

6).When the electronic scale displays the proper weight (refer to the gauge and t he 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 discon nec t in g the hose.

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

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 v alv es 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 v alv e’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 positi on.

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 charge set and t he char gin g cy linder, and set the 2-way and 3-way valves to the ope n position. Be sure to use a hexagonal wrench to operate the valve stems.

7). Mount the valve stems nuts and the service port cap. Be sure to use a torque wrench to t ighten the service port cap to a torque 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 system

Procedure:

1). Confirm that both the 2-w ay and 3-way valves are set to the opened pos it i on.

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 turning 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 recor d 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 time) , operating the air condition er 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 the ch ar ge 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 caps and the service port Use torque wrench to tight en t he ser vice port cap to a torque of 18N.m. Be sure to check for gas lea kage.

7. Operation characteristics

CAUTION:

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

may come into operation and ca use t he unit to operate abnormally.

2. The room relative humidity should b e less t han 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 perfor ma nce will be achieved during this operating temperature zone.

8. Electronic function

8.1 Abbreviation

T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperat ur e 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 l a mp:

Lights up during the Auto operation.

Timer indication lamp:

Lights up during Timer operation.

Defrost indication lamp:

This indicator illuminates when the air conditioner starts

defrosting automatically or when the anti-cold wind function is activated in heating opera t ion.

Digital display indication lamp:

Displays current setting temperature or malfunction codes when

the air conditioner is in operation.

8.3 Main Protection

8.3.1 Time Delay at restart for the compressor

8.3.2 Fan Spe ed is out of control.(except MS9A-24HRN1-QB8W models)

----When the indoor fan speed kee ps too low or too high for certain time, the unit will stop and the LED will display the failure

8.3.3 Current prot e ction

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 dete ct ion error prot e ction(except MS9A-24HRN1-QB8W 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 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 the same as in cooling mode.

(5) Auto fa n:

High

Low

Medium

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 essor and outdoor fan will shut off. When T1 is higher than Tm, the compressor and out door fan will start up.

Off

Tm=Ts+1, Tn=Ts-1 for MS9A-24HRN1-QB8W models Tm=Ts+1, Tn=Ts for other models.

8.4.2.2 Outdoor f a n r unning rules

The outdoor units have single fan speed. The outdoor fan will run following the action of 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.

5.0

T1-Ts

High

Low

1.0

4.0

Medium

8.4.2.4 Low evaporator coil temperature T2 protection

TE6

Off

TE5

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.

8.4.2.5 Condenser high temperature T3 protection(For MS9A-24HRN1-QB8W models) When T3≥65℃, the compressor will stop and restart until T3<55℃. During the protection, the outdoor fan keeps working.

8.4.3 Heating Mode

8.4.3.1 Compressor running rules

Once the compressor starts up, it will follow the below rules: When the 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.

Off

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 action of 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 etting higher, T2>TE2, the indoor fan will 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.

TE2

TE1

Setting

Off

TE3

TE4

Low

Auto fan action :

2.0

T1-Ts

Low

0.0

Medium

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

 Condition of defrosti ng:

For 7k,9k,12k,16k,17k,18k models: 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 in ut es .

 Condition of ending def rosting:

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 compres sor cur r ent has reached or exceeded 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 the defrosting is, if the defrost ing time keeps 7. 5 minutes for 3 ti mes, it will be 10 minutes in the 4

defrosting.

For MS9A-09HRN1-QB8, MS9A-09HRN1-QC2(2T0032300908),MS9A-11HRN1-QB8, MS9A-16HRN1-QB8(A): Condition of defrosting:

If any one of following items is sat i sfied, defrosting will start. Condition 1: Both the following conditions are satisfied:

A: If the working time of the compressor accumulates to 42 min and one continuous

working time is more than 330s.

B: Check the temperature difference between T2 and T1

℃

Fan speed

T2-T1 Note

High

＜TH

DEFROST

If indoor fan is in high speed and T2-T1< TH

DEFROST

, start defrosting

Medium

＜

DEFROST

If indoor fan is in medium speed and T2-T1< TM

DEFROST

, start defrosting

Low

＜

DEFROST

If indoor fan is in low speed and T2-T1< TL

DEFROST

, start defrosting

Breeze or stop / If indoor fan is breezing or stopped, start defrosting

Capacity

T2-T1

DEFROST

MS9A-16HRN1-QB8(A)

16 18 19

Condition 2: If the accumulated time of outdoor fan stopped but the compressor keep working due to evaporator high temperat ur e protection mode reaches 90 min from the end of last defrosting mode.

Condition of defrosting stop:

If any one of following conditions occurs, the defrosting will finish and the machine will turn to normal heating mode. Condition 1: Reached the defrosting time. Condition 2: The current of compressor is more than I

defrost

continuously more than 7s. The value of

defrost

is depending on the exactly mach in e.

Defrosting actions：

During the defrosting mod e, if the machine stopped or transferred to other m ode, the defrosting mode will stop, and all the defrost ing conditions will be cleared.

For 21k,24k models:

 Condition of defrosti ng:

AC will enter defrosting mode if any of the following items is satisfied. (1) If T3<TC1 and the compressor keeps running ov er 45 minutes. Meanw hile T3＜TC3 for 3minutes. (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 ending def rosting:

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 ha s r un f or 10 minutes in defrosting.

 Defrosting action

：

8.4.3.5 High evaporator coil temp.T2 protecti on

For 7k,9k,12k,16k,17k,18k models:

For 21k,24k models:

8.4.4 Auto-mode

The machine will choose cooling, heating or fan-only mode according to ΔT (ΔT =T1-Ts).

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） Pressing the forced auto button. （2） If AC is off, it will run in auto mode when the timer on function is active. （3） After setting the mode, AC will run in auto mode if the compressor keeps not running for 15

minutes.

8.4.5 Drying mode

For 7k,9k,12k,16k,17k,18k models:

8.4.5.1 The indoor fan will run following the action of the compressor. If the compressor is on, the indoor fan will run at low speed. I f the c ompressor is off, the indoor fan will run at breeze.

Running rules:

Condition

Indoor fan

Compressor

1 T1- Ts ≧2

Low

Breeze

ON 6 minutes OFF 4 minutes

0≤T1- Ts＜2

Low

Breeze

ON 5 minutes OFF 5 minutes

T1- Ts＜0

Low

Breeze

ON 4 minutes

OFF 6 minutes In drying mode, if the room temperature is lower than 10℃, the indoor fan will run at breeze while the compressor and outdoor fan will stop and not resu me until room temperature exceeds 13℃. For 21k,24k models:

8.4.5.2 The indoor fan keeps run at low speed. The compressor and outdoor fan run the same as in cooling mode.

8.4.5.3 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 sequ ence:

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 with 24℃ setting temperat ur e. 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, sleep mode setting, follow me sett ing, it will quit the forced operation.

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 aut omatically when reaching the sett ing 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 running, the AC will quit this mode and turn off.

8.4.8.2. Operation process in sleep mode is as follow: After pressing ECONOM IC or SLEEP button on the controller, the machine will turn i nt o sleep mode. When cooling, the setting temperature rises 1 ℃

(be lower th

setting temperature stops rising and the 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 hour, 2 hours later the

the indoor fan is fixed

as low speed.(Anti-cold wind function has the priority)

8.4.8.3 Timer setting is available

8.4.8.4 When user uses timer off function in slee p 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 ttin g tem p . 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. indoor fan restarts after malfunctions being eliminated and anti-cold-wind being released, Ionizer will be available again.

8.4.10 8℃ Heating(optional)

In heating operation, the preset temp erature o f the air conditioner can be as low er as 8℃, which keeps the room temperature steady at 8℃ and prevents household things freezing when the house is unoccupied for a long time in sever e c old weather.

9. Troubleshooting

9.1 Indoor unit error display

For MS9A-09HRN1-QB8, MS9A-09HRN1-QC2(2T0032300908), MS9A-11HRN1-QB8, MS9A-16HRN1-QB8(A):

Display LED STATUS

E1 EEPROM error E2 Zero crossing signal dete ction error E3 Indoor fan speed has been out of co nt r ol E4 Over current protection of the compressor occurs 4 times E5 Open circuit or short circui t of r oom temperature sensor E6 Evaporator temperature sensor open circuit or short circuit

For 21k,24k models:

Display LED STATUS

E1 EEPROM error E4 Over current protection of the compressor occurs 4 times E5 Indoor room temperature sensor T1 open circuit or short circuit E6 Evaporator coil temperature sensor T2 open circuit or short circuit E7 Condenser coil temperature sensor T3 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 control ☆ O The T1 or T2 sensor is open circuit or short circuit

X ☆

Over current protection occurs 4 times(for

MS9A-12HRN1-QC2 with BOM code 220032402100,it

doesn’t have this kind of protec t ion) O ☆ EEPROM error ☆ ☆ Zero crossing signal dete ction error

O（light） X（off） ☆（flash）

9.2 Diagnosis and Solution

9.2.1 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.

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.

9.2.2 The temp sensor is open ci rcuit or short circuit diagnosis and solut ion

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?

9.2.3 Over current protection occurs 4 times diagnosis a nd solution

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

9.2.4 EEPROM parameter error diagnosis and solution

Is the EEPROM chip plugged in PCB well?

Yes

Correct the connection.

Replace the indoor PCB.

Shut off the power supply and

turn it on 5 seconds later. Is it

still displaying the error code?

9.2.5 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 PCB is defective.

Replace indoor PCB.

9.2.6 Indoor unit a nd outdoor unit communication malfunction diagnosis and solution

Yes

Measure Vs, is it moving alternately with positive value? (Vs is the voltage between N and S of outdoor unit. The red pin of multimeter connects with N port, the black pin of multimeter connects with S port.)

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. Temperature sensor checking 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 T1,T2,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-11HRN1-QB8, MS9A-09HRN1-QB8, MS9A-07HRN1-QC2, MS9A-12HRN1-QC2, MS9A-09HRN1-QB6 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual