Midea 9ASI-A-1209, 9ASI-A-1301 Service Manual

LUNA INVERTER SERIES

Service Manual 2012

9ASI-A-1209

CONTENTS

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

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

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

2. Function ........................................................................................................................................................ 7

3. Dimension .................................................................................................................................................... 8

3.1 Indoor Unit ................................................................................................................................... 8

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

4. Refrigerant Cycle Diagram ........................................................................................................................ 11

5. Wiring Diagram .......................................................................................................................................... 12

5.1 Indoor Unit ................................................................................................................................. 12

5.2 Outdoor Unit .............................................................................................................................. 14

6 Installation Details ...................................................................................................................................... 16

6.1 Wrench torque sheet for installation .......................................................................................... 16

6.2 Connecting the cables ............................................................................................................... 16

6.3 Pipe length and the elevation .................................................................................................... 17

6.4 Installation for the first time........................................................................................................ 18

6.5 Adding the refrigerant after running the system for many years ................................................ 21

6.6 Re-installation while the indoor unit need to be repaired ........................................................... 22

6.7 Re-installation while the outdoor unit need to be repaired ......................................................... 24

7. Operation Characteristics ......................................................................................................................... 27

8. Electronic function .................................................................................................................................... 28

8.1 Abbreviation .............................................................................................................................. 28

8.2 Display function ......................................................................................................................... 28

8.3 Main Protection ......................................................................................................................... 29

8.4 Operation Modes and Functions ............................................................................................... 32

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

9.1 Indoor Unit Error Display ........................................................................................................... 47

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

3

1. Precaution

1.1 Safety Precaution

 To prevent injury to the user or other people and property damage, the following

instructions must be followed.

 Incorrect operation due to ignoring instruction will cause harm or damage.
 Before service the unit, be sure to read this service manual at first.

1.2 Warning

¾ Installation

 Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated

circuit.

There is risk of fire or electric shock.

 For electrical work, contact the dealer, seller, a qualified electrician, or an authorized

service center.

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

 Always ground the product.

There is risk of fire or electric shock.

 Install the panel and the cover of control box securely.

There is risk of fire of electric shock.

 Always install a dedicated circuit and breaker.

Improper wiring or installation may cause fore or electric shock.

 Use the correctly rated breaker of fuse.

There is risk of fire or electric shock.

 Do not modify or extend the power cable.

There is risk of fire or electric shock.

 Do not install, remove, or reinstall the unit by yourself (customer).

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

 Be caution when unpacking and installing the product.

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

4

condenser and evaporator.

 For installation, always contact the dealer or an authorized service center.
 Do not install the product on a defective installation stand.
 Be sure the installation area does not deteriorate with age.

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

and personal injury.

 Do not let the air conditioner run for a long time when the humidity is very high and a

door or a window is left open.

 Take care to ensure that power cable could not be pulled out or damaged during

operation.

There is risk of fire or electric shock.

 Do not place anything on the power cable.

There is risk of fire or electric shock.

 Do not plug or unplug the power supply plug during operation.

There is risk of fire or electric shock.

 Do not touch (operation) the product with wet hands.
 Do not place a heater or other appliance near the power cable.

There is risk of fire and electric shock.

 Do not allow water to run into electrical parts.

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

 Do not store or use flammable gas or combustible near the product.

There is risk of fire or failure of product.

 Do not use the product in a tightly closed space for a long time.

Oxygen deficiency could occur.

 When flammable gas leaks, turn off the gas and open a window for ventilation before

turn the product on.

 If strange sounds or smoke comes from product, turn the breaker off or disconnect the

power supply cable.

There is risk of electric shock or fire.

 Stop operation and close the window in storm or hurricane. If possible, remove the

product from the window before the hurricane arrives.

5

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

 Do not open the inlet grill of the product during operation. (Do not touch the electrostatic

filter, if the unit is so equipped.)

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

 When the product is soaked, contact an authorized service center.

There is risk of fire or electric shock.

 Be caution that water could not enter the product.

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

 Ventilate the product from time to time when operating it together with a stove etc.

There is risk of fire or electric shock.

 Turn the main power off when cleaning or maintaining the product.

There is risk of electric shock.

 When the product is not be used for a long time, disconnect the power supply plug or

turn off the breaker.

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

 Take care to ensure that nobody could step on or fall onto the outdoor unit.

This could result in personal injury and product damage.

¾ CAUTION

 Always check for gas (refrigerant) leakage after installation or repair of product.

Low refrigerant levels may cause failure of product.

 Install the drain hose to ensure that water is drained away properly.

A bad connection may cause water leakage.

 Keep level even when installing the product.

It can avoid vibration of water leakage.

 Do not install the product where the noise or hot air from the outdoor unit could damage

the neighborhoods.

It may cause a problem for your neighbors.

 Use two or more people to lift and transport the product.
 Do not install the product where it will be exposed to sea wind (salt spray) directly.

It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins,

6

could cause product malfunction or inefficient operation.

¾ Operational

 Do not expose the skin directly to cool air for long time. (Do not sit in the draft).
 Do not use the product for special purposes, such as preserving foods, works of art etc.

It is a consumer air conditioner, not a precision refrigerant system.

There is risk of damage or loss of property.

 Do not block the inlet or outlet of air flow.
 Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.

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

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

sharp.

 Do not step on or put anything on the product. (outdoor units)
 Always insert the filter securely. Clean the filter every two weeks or more often if

necessary .

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

damage.

 Do not insert hands or other objects through air inlet or outlet while the product is

operated.

 Do not drink the water drained from the product.
 Use a firm stool or ladder when cleaning or maintaining the product.

Be careful and avoid personal injury.

 Replace the all batteries in the remote control with new ones of the same type. Do not

mix old and new batteries or different types of batteries.

There is risk of fire or explosion.

 Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.

They may burn of explode.

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

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

7

2. Function

Model Names of Indoor/Outdoor Units

DC

Inverter

Capacity Indoor units Outdoor units

9k

MS9AU-09HRDN1-QRC4W MOB-09HFN1-QRC4W

12k

MS9AU-12HRDN1-QRC4W MOB-12HFN1-QRC4W

18k

MS9AU-18HRDN1-QRC4W MOC-18HFN1-QRC4W

24k

MS9A-24HRDN1-QRC4W MOF-24HFN1-QRC4W

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

Hydrophilic aluminum fin

Anti-rust cabinet

Valve protection cover

PTC Heating Belt(O)

1W standby

O: optional function

8

3. Dimension

3.1 Indoor Unit

L

R

H

Model W D H

MS9AU-09HRDN1-QRC4W 710 190 250

MS9AU-12HRDN1-QRC4W 790 198 265

MS9AU-18HRDN1-QRC4W 920 223 292

MS9A-24HRDN1-QRC4W 998 240 322

9

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

MS9AU-09HRDN1-QRC4W 111.5 100 45

Φ65 MS9AU-12HRDN1-QRC4W

151

100 45

MS9A-24HRDN1-QRC4W

118.5

100 45

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

MS9AU-18HRDN1-QRC4W 186.5 150 45 Φ65

10

3.2 Outdoor Unit

More than 30cm

More than 60cm

More than 70cm

More than 30cm

More than 60cm
(Service space

)

F

e

n

c

e

o

r

o

b

s

t

a

c

l

e

s

Model W D H W1 A B

MOB-09HFN1-QRC4W 780 250 540 843 549 276

MOB-12HFN1-QRC4W 780 250 540 843 549 276

MOC-18HFN1-QRC4W 760 285 590 823 530 290

MOF-24HFN1-QRC4W 845 320 700 908 560 335

11

4. Refrigerant Cycle Diagram

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

12

5. Wiring Diagram

5.1 Indoor Unit

MS9AU-09HRDN1-QRC4W, MS9AU-12HRDN1-QRC4W, MS9AU-18HRDN1-QRC4W

13

MS9A-24HRDN1-QRC4W

14

5.2 Outdoor Unit

MOB-09HFN1-QRC4W

MOB-12HFN1-QRC4W, MOC-18HFN1-QRC4W

15

MOF-24HFN1-QRC4W

16

6 Installation 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)

Ф15.9 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 specifications sheet.

Rated current of appliance Nominal cross-sectional area (mm²)

>3 and ≤6 0.75

>6 and ≤10 1

>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.

17

6.3 Pipe length and the elevation

The pipe length and refrigerant amount:

Model

Pipe size

Standard

length

(m)

Max.

Elevation

B (m)

Max.

Length

A (m)

Additional
refrigerant

(g/m)

Gas Liquid

MS9AU-09HRDN1-QRC4W+MOB-09HFN1-QRC

4W

3/8’’

(Ф9.52)

1/4’’

(Ф6.35)

5 8 20 20

MS9AU-12HRDN1-QRC4W+MOB-12HFN1-QRC

4W

5 8 20 20

MS9AU-18HRDN1-QRC4W+MOC-18HFN1-QRC

4W

1/2’’

(Ф12.7)

1/4’’

(Ф6.35)

5 10 25 20

MS9A-24HRDN1-QRC4W+MOF-24HFN1-QRC4

W

5/8’’

(Ф15.9)

3/8’’

(Ф9.52)

5 10 25 40

Caution:

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

system reliability.

The oil trap should be installed per 5-7 meters.

18

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 corrosion of parts in the refrigerant system.

Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested

and evacuated to remove gas and moisture from the system.

Gas leak check (Soap water method):

Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit

connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles

come out, the pipes have leakage.

1. Air purging with vacuum pump

1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and

3-way valves are set to the closed position.

2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port..

3) Connect the charge hose of handle hi connection to the vacuum pump.

4) Fully open the handle Lo of the manifold valve.

5) Operate the vacuum pump to evacuate.

6) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If

(Indoor unit)

(Liquid side)

(Gas side)

Vacuum

pump

Vacuum
pump

Lo Hi

Handle Hi

Two-way valve

Close

Manifold valve

Compound mete

r

Pressure
gauge

-0.1MPa

Handle Lo

Charge hose

Charge hose

(Outdoor unit)

Close

Three-way valve