Midea IC SI-A-1205 Service Manual

IC INVERTER SERIES

Service Manual 2012

ICSI-A-1205

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 .................................................................................................................................. 9

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

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

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

5.2 Outdoor Unit ................................................................................................................................ 13

6 Installation Details ...................................................................................................................................... 14

6.1 Wrench torque sheet for installation ........................................................................................... 14

6.2 Connecting the cables ................................................................................................................ 14

6.3 Pipe length and the elevat ion ..................................................................................................... 15

6.4 Installation for the fir st time ......................................................................................................... 16

6.5 Adding the refrigerant after running t he s ystem for many years ................................................ 19

6.6 Re-installation w hi le t he indoor unit need to be repaired ........................................................... 20

6.7 Re-installation w hi le t he outdoor unit need to be repaired ......................................................... 22

7. Operation Characteristics ......................................................................................................................... 25

8. Electronic function .................................................................................................................................... 26

8.1 Abbreviation ................................................................................................................................ 26

8.2 Display function ........................................................................................................................... 26

8.3 Main Protection ........................................................................................................................... 27

8.4 Operation Modes and Functions ................................................................................................. 28

9. Troubleshooting ......................................................................................................................................... 42

9.1 Indoor Unit Error Display ............................................................................................................. 42

9.2 Diagnosis and Solution ............................................................................................................... 43

3

1. Precaution

1.1 Safety Precaution

To prevent injury t o t he us er or other people and property damage, the following instructions
must be followed.
Incorrect operation due to ignoring inst ruction will cause harm or damage.
Before service the unit, be sur e to r ead this service manual at first.

1.2 Warning

 Installation

Do not use a defective or under rat ed circuit breaker. Use this appliance on a dedicat ed 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 inst all, 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 p roduct.

Sharp edges could cause injur y, be especially careful of the case edges and t he f ins on the condenser
and evaporator.

4

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
window is left open.
Take care to ensure that power cable could not be pulled out or damaged during operat ion.

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 product, 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 t he gas and open a windo w 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 the window in storm or hurricane. If possible, remove the product from
the window before the hurricane arrives.

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

Do not open the inl et gr ill of the product during operation. (Do n ot touch the electrost atic filter, if

5

the unit is so equi pped.)

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 product.

There is risk of electric shock.

When the product is not be used for a long ti me, disco nnect t he powe r suppl y plug or turn off t he
breaker.

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

Take care to ensure that nob ody could step on or fall onto the outdoor unit.

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

 CAUTION

Always check for gas (refri gerant) 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 wat er lea kage.

Do not inst all the product where t he noise or hot air fr om the outdoor uni t could damage the
neighborhoods.

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 product. Corrosion, particularly on the condenser and evaporator fins,
could cause product malfunction or inefficient operati on.

6

 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 speci al purposes, such as preserving foo ds, wor ks of ar t 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 i nl e t 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 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 put anything on the prod uc t . (outdoor units)
Always insert the filt er securely. Clean the filter every two weeks or more often if necessary.

A dirty filter redu ces th e efficiency of the air conditio ner and could c aus e prod uct m alfu nction or da mag e.

Do not insert hands or other objects through air inlet or outl e t while the product is 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 in the remote control with new ones of t he 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 batt er i es in a fire.

They may burn of explode.

If the liquid from t he batt eri es get s o nto y our ski n or cl othes, wa sh it well with c lean water. Do not
use the remote of the batt er i es have leaked.

7

2. Function

Model Names of Indoor/Outdoor Units

DC

Inverter

Capacity Indoor units Outdoor units

9k MSIC-09HRDN1-QC2 MOR-09HDN1-QC2

12k MSIC-12HRDN1-QC2 MOR-12HDN1-QC2

Concealed display

Super slim

Easily removable filter

Golden fin

Dry and self clean

Compressor Crankcase Heater(O)

Self-diag. function

Vitamin C filter(O)

Valve protection cover

Horizontal &Vertical swing function

Variable fan speeds

High density silver ion filter

Intelligent sleep mode

I mode

Bio filter(O)

Low ambient cooling(O)

O: optional function

8

3. Dimension

3.1 Indoor Unit

D

H

W

L

R

H

Model

W H D

MSIC-09HRDN1-QC2

890 310 150

MSIC-12HRDN1-QC2

Model L R

H(mm)

Dimension of

installation hole(mm)

MSIC-09HRDN1-QC2

184 143

45 Φ65

MSIC-12HRDN1-QC2

9

3.2 Outdoor Unit

More than 30cm

More than 60cm

More than 70cm

More than 30cm

More than 60cm
(Service space)

Fence or

obstacles

10

Model W D H W1 A B

MOR-09HDN1-QC2

660 265 540 732 458 276

MOR-12HDN1-QC2

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

MSIC-09HRDN1-QC2, MSIC-12HRDN1-QC2

13

5.2 Outdoor Unit

MOR-09HDN1-QC2, MOR-12HDN1-QC2

14

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 s pecifications 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 sw it ch.

15

6.3 Pipe length and the elevation

The pipe length and refrigerant amount:

Model

Pipe si ze

Standard

length

(m)

Max.

Elevation

B (m)

Max.

Length

A (m)

Additional
refrigerant

(g/m)

Gas Liquid

MSIC-09HRDN1-QC2+MOR-09HDN1-QC2

3/8’’

(Ф9.52)

1/4’’

(Ф6.35)

5 8 20 20

MSIC-12HRDN1-QC2+MOR-12HDN1-QC2

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.

16

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 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 leakage.

1. Air purging with vacuum p um p

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

Lo

Hi

Handle Hi

Two-way valve

Close

Manifold valve

Compound meter

Pressure

gauge

-

0.1M

Pa

Handle Lo

Charge hose

Charge hose

(Outdoor unit)

Close

Three

-way valve

17

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° counterclo ckwise for 6 or 7seconds after the g as
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 tig ht 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.

18

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 char ging cylinder, open the 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 h ose.
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 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

19

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 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 h ose.
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 iquid refrigerant.

Electronic scale

20

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 disconnecting 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 valve s 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.

21

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.

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 tighten the flare nut on the 2-way valve.

4). Check the gas leakage
Check the flare connections for gas leakage.

5). Discharge the refrigerant.

22

Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the
2-way valve approximately 45’ until the gau ge i ndicates 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 pos it i on.

2). Connect the vacuum pump t o 3-way valve’s service port.

3). Evacuation for approxi mately one hour. Con firm that the compound meter indicates -0.1Mpa.

4). Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm th at 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.

23

2. Refrigerant charging

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 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). 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 conditioner in the co oling 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 c harge 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.

6). Mounted the valve stem cap s and the service port

Electronic scale

24

Use torque wrench to tight en t he ser vice port cap to a torque of 18N.m.
Be sure to check for gas leaka ge

25

7. Operation Characteristics

Temperature

Mode

Cooling operation Heating operation Drying operation

Room temperature

≥17℃ ≤30℃ ＞10℃

Outdoor temperature

0℃～50℃

-15℃～30℃ 0℃～50℃

-15℃～50℃

(For the models with

low temperature

cooling system)

CAUTION:

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

may come into operation and 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 a ngle (vertically to the floor), and set HIGH fan mode.

3. The optimum performance will be achieved during this oper at ing temperature zone.

26

8. Electronic function

8.1 Abbreviation

T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
TP: Compres sor discharge temperature

8.2 Display function

8.2.1 Icon explanation on indoor display board.

Each time the “DISPLAY” button of remote controller is pressed, the displ ay area displays in a
sequence of following:
Room temp. Outdoor ambient temp.

Setting temp. Display turns off
NOTE:
 If the indoor/outdoor temperature sensor is failure, it will not display the indoor/outdoor

temperature.

 Under inquiring, the indoo r temperatur e flashes at 0.5HZ, and outdoor t empera ture flashes at

1HZ. If there is no button operation during 15 seconds, the set temperature wi ll rev ert back to
the display window.

 The actual room temperature and outside temperature can be displayed in a range of

-9.5℃-70 ℃

 Displays the malfunction code.

27

8.3 Main Protection

8.3.1 Three Minutes Dela y at restart for compressor

1 minute delay for the 1

st

time start-up and 3 minutes delay for others.

8.3.2 Temp erature protection of compressor top

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

8.3.3 Temperature pr ot ection of compressor di scharge

When the compressor discharge temp. is getting higher, the running frequency will be limited as
below rules:

---Compressor discharge t em p. T5>115℃ for 9s, compressor stops.

---110<T5<115℃, decrease the frequency to the lower lev el every 2 minutes.

---105<T5<110℃, keep running at the current frequency.

----T5<90℃, no limit for frequency.

8.3.4 Fan Spe ed is out of control

When Indoor Fan Speed keeps too low (lower than 300RPM) or too high(higher than 2100RPM)
for certain time, the unit w i ll stop and the LED will display the failure

8.3.5 Inverter module Pr otect i on

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

8.3.6 Indoor fan delayed open functio n

When the unit starts up, the louver will be active immediately and the indoor fan will open 10s
later.
If the unit runs in heatin g mo de, t he indoor fan will be also controlled by ant i-cold wind function.

8.3.7 Compress or preheating functio ns

Preheating permitting condition:
If T4(outdoor ambient temperature)＜T4preheat℃ and T1＜18℃, the compressor heating cable
will work.
Preheating mode:
A weak current flow through the coil of compressor from the wiring terminal of the compressor,

28

then the compressor is heat ed w ithout operation.
Preheating release condition:
If T4≥3℃ or T1≥18℃, the prehe at ing function will stop.

8.3.8 Zero crossi ng detection error protection

If AC detects time interval is not correct for continuous 240s, the unit will stop and the LED will
display the failure. The correct zero crossing signal time inter val should be between 6-13ms.

8.3.9 Sensor protection at open circuit and breaking disconnect ion.

When there’s one temperature sensor in malfunction, the air conditioner will display error code
and will not stop immediately, to avoid the case that the air conditioner is in urgent need.

Fault temp.

sensor

Operation in cooling, dry ing and

fan only mode

Operation in heating mode

T1

Run supposed T1=26℃ high fan
speed

Run supposed T1=26℃ high fan
speed

T2

Refer to table 1

Refer to table 2

T3

Run with compressor freq uency

not higher than F14

3 minutes’ defrostin g every 40

minutes when T4<7℃; 2 minutes’
defrosting every 90 minutes w hen

T4≥7

℃

.

T4

Run supposed T4=50℃

Run supposed T4=15℃

TP

Run supposed T4=50℃

Run supposed T4=15℃

T1

25

23

F12

F4(30 minutes on+3

minutes off)

table 1

T1

20

18

F4

F12(Indoor fan 1 minute
off, 1 minute M- ane then
the setting fan speed.)

table 2

8.4 Operation Modes and Functions

8.4.1 Fan mode

(

1) Outdoor fan and compressor stop.

(2) Temperature setting function is disabled. And the display window shows the indoor room

29

temperature.
(3) Indoor fan can be set by remote controller

from 1% to 100%.

(4) The louver operates same as in cooling mode.
(5)The auto fan in fan mode is running as auto fan of cooling mode with 24

℃ setting

temperature.

8.4.2 Cooling Mode

8.4.2.1 Compressor running rules

The maximum operation frequency of compressor after starting submits to the following rule. The
maximum operation frequency is limited by outdoor ambi ent t em p.

t11

t12

t13

t14

t15

t16

t17

t18

Fmax= T4FREMAX1

t19

t20

t21

t22

Fmax= T4FREMAX2

Fmax= T4FREMAX3

Fmax= T4FREMAX4

Fmax= T4FREMAX5

Fmax= T4FREMAX6

Fmax= T4FREMAX7

Also the maximum freque ncy is limited by the indoor fan speed:

Indoor fan speed

Maximum frequency

80%-100%

No limit

60%-79%

FCoolMaxMidFan

40%-59%

FCoolMaxLowFan

1%-39%

FQCoolMax

30

If users switch on AC by remote controller, the compressor will run at the Fmax frequency for
several minutes. Then the compressor running frequency will be contr olled as below:

3.5

3.0

2.5

2.0

1.5

1.0

0.5

-0.5

T1-Ts

-1.0

A

B

C

D

E

F

G

H

-1.5

0.0

I

J

While the zones of A,B,C... are corresponding to di fferent compressor running frequency.
Meanwhile, the compressor running frequency is limited by t he cur r ent.

ISTOPCOOL

I

Icmax

Off

Decrease

Hold

Resume

Icmax-I1COOL

Off: Compressor stops.
Decrease: Decrease the r unning frequency to the lower level.
Hold: Keep the curre nt frequency.
Resume: No limitation for frequency.
While the Icmax is limited by the outdoor ambient temp er at ur e as below:

31

50

49

45

44

41

40

Icmax= I2COOL

Icmax= I3COOL

Icmax= I4COOL

Icmax= I5COOL

8.4.2.2 Outdoor fan running rules

22

20

High

Low

8.4.2.3 Indoor fan running rules

In cooling mode, indoor fan r uns al l t he t i me a nd t he speed can be selected from 1% to 100%.
If the indoor unit changes from off to auto fan, the indoor fan will run at 100% for 5 minutes, then
follow the below rules.

32

Auto fan:

2.0

T1-Ts

100%

80%
60%

40%

1%

1.5

1.0

0.5

0.0

-0.5

-1.0

90%

20%

8.4.2.4 Condenser temperature protection

TP4

T3

TP3

Off

Decrease

Hold

Resume

TP2

Off: Compressor stops.
Decrease: Decrease the r unning frequency to the lower level.
Hold: Keep the curre nt frequency.
Resume: No limitation for frequency.

8.4.2.5 Evaporator temperature protection

---T2<0℃, the compressor will stop and r estart when T2

>=5℃.

---0℃≦T2<4℃, the compressor frequency will be limited and decreased to the lower lev el

---4℃≤T2≤7℃, the compressor will keep the current frequency.

---T2>7℃, the compressor frequency will not be limited.

8.4.3 Heating Mode

8.4.3.1 Compre ssor running rules:

The maximum operation frequency of the com pr essor after starting submits to the following rule.

33

Fmax=F6

Fmax=F10

Fmax=F14

Fmax=F18

Fmax=F20

Fmax=F16

Fmax=F12

Fmax=F4

34

Off

33

28
27

25
24

22
21

19
18

16

17

15
14

Fmax=F8

12
11

6.0

5.0

Fmax=F21

Fmax=F22

Fmax=F23

Fmax=F24

Fmax=F25

1.0

0.0

-3.0

-4.0

-7.0

-8.0

-11.0

-12.0

-15.0

-16.0

Also the maximum freque ncy is limited by the indoor fan speed:

Indoor fan speed

Maximum frequency

80%-100%

No limit

60%-79%

FHeatMaxMidFan

40%-59%

FHeatMaxLowFan

1%-39%

FQHeatMax

If users switch on AC by remote controller, the compressor will run at the Fmax frequency for
several minutes according to outdoor ambient temp.
Then the compressor running frequency w ill be controlled as below:

34

+5.0
+4.5
+3.5

+3.0
+2.5
+2.0

+1.5

T1-Ts

+1.0

J

G

F

E

D

C

B

A

+0.5

I

H

While the zones of A,B,C... are corresponding to differ ent compressor running frequency.
Meanwhile, the compressor running frequency is limited by t he current.

ISTOPHEAT

I

I2HEAT

Off

Decrease

Hold

Resume

I1HEAT

Off: Compressor stops.
Decrease: Decrease the r unning frequency to the lower level.
Hold: Keep the current frequency.
Resume: No limitation for frequency.

35

8.4.3.2 Outdoor fan running rules

17

15

Low

High

8.4.3.3 Indoor fan running rules

Indoor fan speed can be set from 1% to 100% and the anti-cold-wind function is preferential.
The run ning r ules of anti-cold-wind function depend on both T1 and T2 that is more comfortable

control.
Auto fan action in heating mode:

6.0

T1-Ts

100%

80%

60%

40%

1%

5.5

5.0

4.5

4.0

8.4.3.4 Defrosting mode
Condition of defrosting:

If any one of the following items is s at is fi ed, AC will enter the defrosting mode.
After the compressor starts up and keeps running, mark the minimum value of T3 from the 7th
minutes to 12th minutes as T30.

1)If the compressor cumulate running time is up to 29 minutes and T3< TCDI1, T3＋
T30SUBT3ONE≦T30.

2)If the compressor cumulate running time is up to 35 minutes and T3< TCDI2, T3＋
T30SUBT3TWO≦T30.

3)If the compressor cumulat e r unni ng t ime is up to 29 minutes and T3< TCDI3 for 3 minutes.

4)If the compressor cumulat e r unning time is up to 120 minutes and T3<-15℃.

36

5)For the first time defrosting af t er t he unit s tarts operation newly, if it meets all of the below rules:
a: AC is ru nning in heating mode.
b:After the AC operates for 30 minutes, if the T4- T3 >f(T4)=0.5T4+ KDELTTT.
c:T3<-5℃

Condition of ending defrosting:

If any one of the following items is satisfied, the defrosting will finish and the machine will turn to
normal heating mode.

----T3 rises to be higher than TCDE1℃.

----T3 keeps to be higher than TCDE2℃ for 80 seconds.

----The machine has run for 15 minutes in defrosting mode.

Defrosting action：

Compressor

on
off

on

on

on

off

off

off

4-way valve

Outdoor fan

Indoor fan

20

no longer than 15m

20s

10s

10s

37

8.4.3.5 Evaporator coil temperature protection

TEstop

T2

Off

Decrease

Hold

Resume

TEdown

TEnorm

8.4.4 Auto-mode

This mode can be chosen with remote controller and the setting temperature can be changed
between 17~30℃.
In 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

-3<ΔT≤2℃

Fan-only

ΔT≤-3℃

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

8.4.5 Drying mode

8.4.5.1 Indoor fan speed is fixed at auto fan of cooling mode and can’t be changed. The louver
angle is the same as in cooling mo de.

8.4.5.2 Compressor running rules

38

2.0

1.5

1.0

T1-Ts

Rated frequency

F10

F8

F6

2.5

0.5

0.0

8.4.5.3 Low indoor room t em per at ure protection
In drying mode, if room temperature is lower than 10℃, the compressor will stop and not resume
until room temperature ex ceeds 12℃.

8.4.5.4 Evaporator anti-freezing protection, condenser high temperature protection and outdoor
unit frequency limit are act ive and the same as that in cooling mode.

8.4.5.5 The outdoor fan operates the same as in cooling mode.

8.4.6 Forced operation funct i on

8.4.6.1 Enter forced operation function:
When the machine is off, pressing the touch button will carry the machine to forced auto mode.
After this, pressing the button once again within 5 seconds, the machine will turn into forced
cooling mode.
In forced auto, forced cooling or any other operation mode, pressing touch button will turn off the
machine.

8.4.6.2 In forced operation mod e, all general protections and remote co nt rol are available.

8.4.6.3 Operation rules:
Forced cooling mode:
The compressor runs at F2 frequency and indoor fan runs at 20%. After running for 30 minutes.
the machine will turn to auto mode as 24℃ setting temperature.
Forced auto mode:
The action of forced auto mo de i s t he s ame as normal auto mode with 24℃ setting temperature.

39

8.4.7 Timer function

8.4.7.1 Timing range is 24 hours.

8.4.7.2 Timer on. The machine will tur n 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 auto matically when reaching the setting “off” time.

8.4.7.5 Timer off/on. The m achi ne will turn off automatically when reaching the setting “off” time,
and then turn on automatically when reaching the setting “on” time.

8.4.7.6 The timer function will not change the AC current operation mod e. 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 of f a nd t he AC running mode has not been changed.

8.4.7.7 The setting time is r elat iv e t ime.

8.4.8 Intelligent sleep mode

This function is only available in cooling mode and heating mode.

Two kinds of sleep modes are

optional. Press “FUNCTION” button to select.
Sleep mode A:

 Running time in sleep mode is 8 hours. 8 hours later, AC will quit sleep mode and the setting

temp. decrease 1℃ for cooling mode or increase 1℃ for heating mode.

● When cooling, the setting temper at ur e r i ses 1℃(be lower than 30℃) every one hour, 2 hours

later the setting temperatur e stops rising.

 When heating, the s etting temper ature decre ases 1℃(be h ig her than 17℃) e ver y one hour, 2

hours later the setting temperat ur e st ops changing .

● The indoor fan runs at auto speed.

Sleep mode B:

40

● Running time in sleep mode is 9 hours. 9 hours later, AC will quit sleep mode.

● When cooling, the default setting te m per at ure is 25℃ which will increas e 1 ℃ every one

hour,2 hours later the setting temperature st ops rising.

● When heat ing, the default setting temperature is 22℃ which will decrease 1 ℃ every one

hour, 2 hour s l at er t he s et t ing temperature stops changing.

● If the setting temper ature i s chang ed duri ng X hour s, it w ill be memorized and enab le d as the

setting temperature of X~9 hours in the next t ime r unning while the setting temperature in the X-1
hours will not change.

● The indo or fa n r uns at auto speed.

8.4.9 I mode

The “I mode” is used to restore the current settings or resume previous settings. Under cooling or
heating operation, push the “i mode” button of remote controller for more than half and one
second, the system will restore the current operation settings including operating mode, setting
temperature, fan speed level and sw ing f eature(if activat ed ). On the f irst time pressing th is button,
the unit will operate on COOL mode, 26 ℃(or HEAT mode, 20 ℃), and fan speed is auto.

8.4.10 Low-frequency operation with auto fan

This function is only available in cooling mode. Press “FUNCTION” button , then press the

“ADJUST“ to

and select “OK”. Then the function will be active.
During the function, the maximum running frequency will be limited and the indoor fan speed is
auto which is more energy -saving.

8.4 11 Dry and Self clean function

When the unit is turned off, it will run in fan only mode for 7 minutes, then run heat mode with low
fan for 1 minute, and then run fan only mode for 2 minutes. This function can prov ide you clean air

41

and keep you healthy.

Hydrophilic golden fin with ant i-oi l pollution and anti dust feature

Condensed water flows thr ough evaporator, and takes away oil and dirt.

8.4 12 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 auto mode as 24℃ setting temp.
If AC is off before power off and AC is required to st ar t up now, the compressor will have 1 minute
delay when power on. Other conditions, the compressor will have 3 minutes delay when it
restarts.

42

9. Troubleshooting

9.1 Indoor Unit Error Display

Display LED STATUS
E0

EEPROM parameter er r or
E1 Indoor unit and outdoor unit communication protection
E2 Zero-crossing signal detection error
E3 Indoor fan speed has been out of co nt r ol
E5 Open circuit or short circu i t of outdoor temperature sensor
E6 Open circuit or short circu i t of room or evaporator coil temperat ur e sensor
P0 IPM malfunction or IGBT over-strong current protection
P4 Inverter compressor drive error

43

9.2 Diagnosis and Solution

9.2.1 EEPROM parameter error diagnosis and solution(E0)

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

No

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 repro gra mme d using a pu lsed
voltage.

44

9.2.2 Indoor / out door units communication error diagnosis and solutio n(E1)

Yes

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?

No

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.

No

Is the wiring to the outdoor main
PCB connected correctly?

Power on. Is the error extinguished?

Change the indoor main PCB.

No

45

9.2.3 Zero crossi ng detection error diagnosis and solution(E2)

Check if the connections and

power supply is normal?

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

No

Yes

Indoor main PCB is

defective. Replace indoor

main PCB.

46

9.2.4 Indoor fan speed has been out of control diagnosis and soluti on(E3)

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?

No

Yes

No

Correct the connections.No

Yes

Check whether the main PCB is

normal through index 2?

Yes

Yes

Check whether the fan

motor is normal through

index 1?

Yes

Replace the fan

motor

Replace the

main PCB.

The

malfunction is

solved?

No

No

If the

malfunction is

still existing,

replace the

main PCB

No

47

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 seconds,
measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V
power supply)or 50V(115V power supply), the PCB must has problems and need to be replaced.

48

9.2.5 Open circuit or short circuit of temperature sensors diagnosis and
solution(E4/E5/F1/F2/F3)

Check the connections

between temperature

sensor and main PCB.

Are the connections

good?

Correct the connections.

No

Yes

Yes

Replace indoor or outdoor main

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?

No

49

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

Check if the wiring between main
PCB and compressor connected by
error and if the wires and connectors
are broken?

Correct the connection or

replace the wires and

connectors.

Yes

No

Check if the IPM installed correctly.

Correct the installation,

tighten the screws and

apply silicon grease.

No

IPM continuity check. Check if the
IPM terminal resistance values are
uniform.

Yes

Replace the IPM board or replace

the main PCB if the IPM board and

main PCB are integrated together.

No

Check if the outdoor fan runs

properly or the outdoor unit

ventilation is good.

Yes

No

Refer to the solution of fan speed

has been out of control

malfunction . Find out the cause

and have it solved.

Yes

Check if the compressor resistance

values are uniform .

No

Replace the compressor.

Yes

Replace the outdoor main PCB if the

main PCB and IPM are separate.

50

9.2.7 Inverter compressor drive error diagno s i s and solution(P4)

Check if the wiring between main
PCB and compressor connected by
error and if the wires and connectors
are broken?

Correct the connection or

replace the wires and

connectors.

Yes

No

Check if the IPM installed correctly.

Correct the installation,

tighten the screws and

apply silicon grease.

No

IPM continuity check. Check if the
IPM terminal resistance values are
uniform.

Yes

Replace the IPM board or replace

the main PCB if the IPM board and

main PCB are integrated together.

No

Check if the outdoor fan runs

properly or the outdoor unit

ventilation is good.

Yes

No

Refer to the solution of fan speed

has been out of control

malfunction . Find out the cause

and have it solved.

Yes

Check if the compressor resistance

values are uniform .

No

Replace the compressor.

Yes

Replace the outdoor main PCB if the

main PCB and IPM are separate.

51

Safety

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

Electrolytic Capacitors

(HIGH VOLTAGE! CAUTION!)

Connect discharge resi st an ce ( approx.100Ω 40W) or soldering iron (plug) between +, - t er mina ls of t he electrolytic
capacitor on the contrary side of the outdoor PCB.

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

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

52

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

Table 1:Some frequently-used R-T data for T1,T2,T3 and T4 sen sor:

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

Table2:Some frequently-used R-T data for TP 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 (℃)

TP

T1,T2,T3,T4

53

Spec.

Code 2T0032300776 2T0032400215

Indoor code 220032308300 220032402810

Indoor MSIC-09HRDN1-QC2 MSIC-12HRDN1-QC2

Outdoor code 220037305880 220037401990

Outdoor MOR-09HDN1-QC2 MOR-12HDN1-QC2

Compressor DA89X1C-23EZD1 DA89X1C-23EZD1

Indoor fan motor RPG20E RPG20E

Outdoor fan motor YDK24-6P(B) YDK24-6P(B)

2. Compressor checking

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

Position Resistance Value

DA89X1C-23EZD1

Blue - Red

1.1Ω

(20℃)

Blue - Black

Red - Blue

54

3.IPM continuity check

Turn off t he pow er, let the large capa city e lectroly tic ca pa citors di scharge comple tely, and dismount the IPM. Use a
digital tester to measure the resistance between P and UVWN; UVW and N.

Digital tester

Normal resistance

value

(+)Red

(-)Black

∞

(Several MΩ)

P

N U V

W

Digital tester Normal resistance value

(+)Red (-)Black

∞

(Several MΩ)

U

N

V

W

4.Indoor AC Fan Motor

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

Position Resistance Value

RPG20E

Black - Red

430Ω±8% (20℃)

White - Black 370Ω±8% (20℃)