Midea MSY-09HRDN1-QC8, MSY-12HRDN1-QC4, MSY-09HRDN1-QC2, MSY-12HRDN1-QC2, MSY-18HRDN1-QC2 Service Manual
Website: www.mideaaircon.com
Service Manual
AIR CONDITIONER
DC Inverter
Split Wall-Mounted Type
Model Refrigerant type Power supply
MSY-09HRDN1-QC8 R410A 1Ph, 220~240V, 50Hz
MSY-12HRDN1-QC4 R410A 1Ph, 220~240V, 50Hz
MSY-09HRDN1-QC2 R410A 1Ph, 220~240V, 50Hz
MSY-12HRDN1-QC2 R410A 1Ph, 220~240V, 50Hz
-18HRDN1-QC2 R410A 1Ph, 220~240V, 50Hz
Y series
CONTENTS
1. Precaution...........................................................................................................................................1
1.1 Safety Precaution..............................................................................................................................1
1.2 Warning................................................................................................................................................1
2. Function...............................................................................................................................................3
3. Dimension...........................................................................................................................................6
3.1 Indoor Unit...........................................................................................................................................6
3.2 Outdoor Unit.......................................................................................................................................7
4. Specification.......................................................................................................................................9
5. Refrigerant cycle diagram...............................................................................................................10
6. Wiring diagram.................................................................................................................................13
6.1 Indoor Unit.........................................................................................................................................13
6.2 Outdoor Unit.....................................................................................................................................13
7. Installation details.............................................................................................................................15
7.1 Wrench torque sheet for installation............................................................................................16
7.2 Connecting the cables..................................................................................................................16
7.3 Pipe length and the elevation......................................................................................................16
7.4 Air purging of the piping and indoor unit...................................................................................16
7.5 Pumping down (Re-installation)....................................................................................................18
7.6 Re-air purging (Re-installation)......................................................................................................19
7.7 Balance refrigerant of the 2-way, 3-way valves........................................................................20
7.8 Evacuation........................................................................................................................................21
7.9 Gas charging....................................................................................................................................22
8. Electronic function............................................................................................................................23
8.1 Abbreviation.....................................................................................................................................23
8.2 Display function................................................................................................................................23
8.3 Protection..........................................................................................................................................24
8.4 Fan-Only Mode................................................................................................................................24
8.5 Cooling Mode..................................................................................................................................25
8.6 Drying mode.....................................................................................................................................26
8.7 Heating mode..................................................................................................................................26
8.8 Auto mode function........................................................................................................................30
8.9 Forced operation function.............................................................................................................30
8.10 Action of 4-way valve...................................................................................................................30
8.11 Two speeds outdoor fan function..............................................................................................31
8.12 Timer function.................................................................................................................................31
8.13 Sleep function mode....................................................................................................................31
8.14 Auto-Restart function....................................................................................................................32
8.15 Super ionizer function....................................................................................................................29
8.16 Self clean function.........................................................................................................................29
8.17 Follow me
function………………………………………………………………………………………………………………
……………….30
8.18 Outdoor heating cable
function…………………………………………………………………………………………………………….30
9. Troubleshooting................................................................................................................................33
9.1 Indoor Unit Error Display..................................................................................................................35
9.2 Diagnosis and Solution....................................................................................................................36
9.3 Key parts checking..........................................................................................................................40
1
1. Precaution
1.1 Safety Precaution
n To prevent injury to the user or other
people and property damage, the following
instructions must be followed.
n Incorrect operation due to ignoring
instruction will cause harm or damage.
n Before service unit, be sure to read this
service manual at first.
1.2 Warning
Ø Installation
n Do not use a defective or underrated
circuit breaker. Use this appliance on a
dedicated circuit.
There is risk of fire or electric shock.
n 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.
n Always ground the product.
There is risk of fire or electric shock.
n Install the panel and the cover of
control box securely.
There is risk of fire of electric shock.
n Always install a dedicated circuit and
breaker.
Improper wiring or installation may cause
fore or electric shock.
n Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
n Do not modify or extend the power
cable.
There is risk of fire or electric shock.
n Do not install, remove, or reinstall the
unit by yourself (customer).
There is risk of fire, electric shock, explosion,
or injury.
n Be caution when unpacking and
installing the product.
Sharp edges could cause injury, be
especially careful of the case edges and the
fins on the condenser and evaporator.
n For installation, always contact the
dealer or an Authorized service center.
There is risk of fire, electric shock, explosion,
or injury.
n Do not install the product on a
defective installation stand.
It may cause injury, accident, or damage to
the product.
n 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.
n 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.
Moisture may condense and wet or
damage furniture.
n Take care to ensure that power cable
could not be pulled out or damaged during
operation.
There is risk of fire or electric shock.
n Do not place anything on the power
cable.
There is risk of fire or electric shock.
n Do not plug or unplug the power
supply plug during operation.
There is risk of fire or electric shock.
n Do not touch (operation) the product
with wet hands.
There is risk of fire or electric shock.
n Do not place a heater or other
appliance near the power cable.
There is risk of fire and electric shock.
n Do not allow water to run into electric
parts.
It may cause fire, failure of the product, or
electric shock.
n Do not store or use flammable gas or
combustible near the product.
There is risk of fire or failure of product.
n Do not use the product in a tightly
closed space for a long time.
Oxygen deficiency could occur.
n When flammable gas leaks, turn off the
gas and open a window for ventilation before
turn the product on.
Do not use the telephone or turn switches
on or off.
There is risk of explosion or fire.
n If strange sounds, or small or smoke
comes from product. Turn the breaker off or
2
disconnect the power supply cable.
There is risk of electric shock or fire.
n Stop operation and close the window
in storm or hurricane. If possible, remove the
product from the window before the hurricane
arrives.
There is risk of property damage, failure of
product, or electric shock.
n 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.
n When the product is soaked (flooded
or submerged), contact an Authorized
service center.
There is risk of fire or electric shock.
n Be caution that water could not enter
the product.
There is risk of fire, electric shock, or product
damage.
n Ventilate the product from time to time
when operating it together with a stove, etc.
There is risk of fire or electric shock.
n Turn the main power off when cleaning
or maintaining the product.
There is risk of electric shock.
n 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.
n Take care to ensure that nobody could
step on or fall onto the outdoor unit.
This could result in personal injury and
product damage.
Ø CAUTION
n Always check for gas (refrigerant)
leakage after installation or repair of product.
Low refrigerant levels may cause failure of
product.
n Install the drain hose to ensure that
water is drained away properly.
A bad connection may cause water
leakage.
n Keep level even when installing the
product.
To avoid vibration or water leakage.
n 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.
n Use two or more people to lift and
transport the product.
Avoid personal injury.
n Do not install the product where it will
be exposed to sea wind (salt spray) directly.
It may cause corrosion on the product.
Corrosion, particularly on the condenser and
evaporator fins, could cause product
malfunction or inefficient operation.
Ø Operational
n Do not expose the skin directly to cool
air for long periods of time. (Do not sit in the
draft).
This could harm to your health.
n 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.
n Do not block the inlet or outlet of air
flow.
It may cause product failure.
n 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.
n Do not touch the metal parts of the
product when removing the air filter. They are
very sharp.
There is risk of personal injury.
n Do not step on pr put anything on the
product. (outdoor units)
There is risk of personal injury and failure of
product.
n 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.
n Do not insert hands or other object
through air inlet or outlet while the product is
operated.
There are sharp and moving parts that
could cause personal injury.
n Do not drink the water drained from the
3
product.
It is not sanitary could cause serious health
issues.
n Use a firm stool or ladder when
cleaning or maintaining the product.
Be careful and avoid personal injury.
n Replace the all batteries in the remote
control with new ones of the same type. Do
not mix old and mew batteries or different
types of batteries.
There is risk of fire or explosion.
n Do not recharge or disassemble the
batteries. Do not dispose of batteries in a fire.
They may burn of explode.
n 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.
The chemical in batteries could cause
burns or other health hazards
4
2. Function
When the power supply is
interrupted and then restore, the
air conditioners automatically
restore the previous function
Maintain the room temperature in
accordance with the setting temperature.
The mode can be change by the room
The louver can be set at the desired
position or swing up and down
The function is usually used in rainy
days in springtime or damp areas.
The fan is turn to low speed
(cooling/heating).
The unit will decide the louver direction
according to
Turbo, high, med, low, breeze.
Restarting is for approx. 3
Prevent the water being fr
ozen
on evaporator by
sensing the evaporator pipe temperature in
Room temperature
sensor.
Indoor unit
Operation by remote
Sensing by room
Room temperature
Anti-freezing control in
Time Delay Safety
Indoor fan speed control
Two-direction air vane
Sleep mode auto control
Independent
Air flow Direction control
Auto mode
Temp. Compensation
Flexible wiring
Auto defrost
Anti-cold function
Self-diag. function
Auto-restart function
Super Ionizer
Prevent the cold wind
at
the beginning of unit start.
Follow
Self clean
Compact
Golden fin
5
It protects the valves and prevents water from
The unit has 3 mins delay between continuously ON/OFF
Outdoor unit
Power relay control
The hydrophilic fin can improve the heating efficiency at
Hydrophilic aluminum fin
It is only operated in the heating operation mode except defrosting
Anti-rust cabinet
Valve protection cover
4 way valve control
Made from electrolytic zinc steel sheet and anti
-
rust coated
Low noise air flow system
Bird tail propeller fan makes the outdoor unit run more
quietly.
Discharge pipe temperature
Heating cable
Driving heating at -15
6
3. Dimension
3.1 Indoor Unit
Dimension
Model
W H D
MSY-09HRDN1-QC2 850 275 160
MSY-09HRDN1-QC8
MSY-12HRDN1-QC2
MSY-12HRDN1-QC4
MSY-18HRDN1-QC2 1022 295 185
900 285 160
7
3.2 Outdoor Unit
MOA-09HDN1-QC2
MOB4-12HDN1-QC2
8
MOC-09HDN1-QC8, MOC-12HDN1-QC4, MOC-18HDN1-QC2
9
4. Specification
Model MSY-09HRDN1-QC8 MSY-12HRDN1-QC4
Indoor MSY-09HRDN1-QC8 MSY-12HRDN1-QC4
Outdoor MOC-09HDN1-QC8 MOC-12HDN1-QC4
Power supply Ph-V-Hz
1,220-240V~,50Hz 1,220-240V~,50Hz
Capacity
Btu/h 9000(3100~11500) 12000(3800~14800)
Input W 690(280~1100) 1030(360~1480)
Rated current A 3.1(1.3~4.8) 4.6(1.6~6.5)
Cooling
EER W/W 3.82 3.41
Capacity Btu/h 10000(3300~12500) 13000(4000~15500)
Input W 690(300~1150) 1000(340~1450)
Rated current A 3.1(1.4~5.0) 4.5(1.7~6.4)
Heating
COP W/W 4.25 3.81
Max. input consumption W 1750 1950
Max. current A 8.0 9.0
Starting current A 5.0 7.0
Model DA108X1C-20FZ3 DA108X1C-20FZ3
Type Rotary Rotary
Brand TOSHIBA TOSHIBA
Capacity Btu/h 10918 10918
Input W 855 855
Thermal protector
CS-74 CS-74
Capacitor uF No No
Compressor
Refrigerant oil ml 480 480
Model RPG20D RPG20D
Brand Welling Welling
Input W 43 43
Capacitor uF 1.5 1.5
Indoor fan
motor
Speed r/min 1290/1250/1000/900/700 1290/1250/1000/900/700
Indoor air flow (Hi/Mi/Lo) m3/h 600/500/400 600/500/400
Indoor noise level (Hi/Mi/Lo) dB(A) 38/34/28 38/34/28
Dimension (W*H*D) mm 900×285×160 900×285×160
Packing (W*H*D) mm 990× 375×250 990×375×250
Indoor unit
Net/Gross weight Kg 9.0/11.5 9.0/11.5
Model YDK24-6G YDK24-6G
Brand Welling Welling
Input W 59 59
Capacitor uF 2.5 2.5
Outdoor fan
motor
Speed r/min 800/550 800/550
Outdoor air flow m3/h 2000 2000
Outdoor noise level dB(A) 54 54
Dimension(W*H*D) mm 760× 590×285 760×590×285 Outdoor unit
Packing (W*H*D) mm 887×655×355 887×655×355
10
Net/Gross weight Kg 40.5/43 40.5/43
Refrigerant type R410A g 1100 1100
Design pressure MPa 4.2 4.2
Liquid side/ Gas side mm Ф6.35/Ф9.53 Ф6.35/Ф 12.7
Max. refrigerant pipe
length m
20 20
Refrigerant
piping
Max. difference in level
m 8 8
Connection wiring No No
Plug type 16A 16A
Thermostat type Electronic control Electronic control
Operation temp
℃
17 ~ 30 17 ~ 30
Ambient temp
℃
-15 ~ 50 -15 ~ 50
Application area m2 16-24 28 ~ 40
Qty’per 20’ /40’ /40'HQ
Set
92/184/225 92/184/225
Model MSY-09HRDN1-QC2 MSY-12HRDN1-QC2 MSY-18HRDN1-QC2
Indoor MSY-09HRDN1-QC2 MSY-12HRDN1-QC2 MSY-18HRDN1-QC2
Outdoor MOA-09HDN1-QC2 MOB4-12HDN1-QC2 MOC-18HDN1-QC2
Power supply Ph-V-Hz
1,220-240V~,50Hz 1,220-240V~,50Hz 1,220-240V~,50Hz
Capacity
Btu/h 9000(3300~11200) 12000(4100~13800) 17000(6000~20000)
Input W 810(240~1200) 1080(360~1400) 1550(530~2040)
Rated current A 3.6(1.2~5.3) 4.9(1.8~6.5) 6.8(2.4~9.2)
Cooling
EER W/W 3.26 3.26 3.22
Capacity Btu/h 10000(4000~13000) 13000(4200~14500) 18000(6400~22000)
Input W 810(240~1250) 1050(350~1420) 1460(480~2000)
Rated current A 3.6(1.2~5.6) 4.6(1.7~6.6) 6.5(2.3~9.0)
Heating
COP W/W 3.62 3.63 3.61
Max. input consumption W 1750 1950 2950
Max. current A 8.0 9.0 13.5
Starting current A 5.5 7.5 10
Model DA89X1C-23EZD1 DA89X1C-23FZ 5RS132ZAD21
Type Rotary Rotary Rotary
Brand TOSHIBA TOSHIBA Panasonic
Capacity Btu/h 8803 9040 3385
Input W 685 680 1250
Thermal protector
CS-74 CS-74 1NT11L-5270 L115-15
Capacitor uF No No No
Compressor
Refrigerant oil ml 370 370 370
Indoor fan Model RPG13G RPG20D RPG28D
11
Brand Welling Welling Welling
Input W 34 43 51
Capacitor uF 1.2 1.5 1.5
motor
Speed r/min 1250/1200/1050/850/700 1280/1250/1050/900/750
1280/1260/1080/900/750
Indoor air flow (Hi/Mi/Lo) m3/h 480/420/320 600/500/400 870/730/520
Indoor noise level (Hi/Mi/Lo) dB(A) 37/33/27 38/34/28 42/37/32
Dimension (W*H*D) mm 850×275×160 900×285× 160 1022×295×185
Packing (W*H*D) mm 940× 360×250 990×375×250 1105×385×275
Indoor unit
Net/Gross weight Kg 8.5/11 9/11.5 12/15.5
Model YDK24-6K YDK24-6G YDK50-6C
Brand Welling Welling Welling
Input W 63/49 59/47 111/96
Capacitor uF 2.5 2.5 2.5
Outdoor fan
motor
Speed r/min 815/590 800/550 890/540
Outdoor air flow m3/h 1800 2000 2200
Outdoor noise level dB(A) 53 54 56
Dimension(W*H*D) mm 700× 535×235 780×540×250 760×590×285
Packing (W*H*D) mm 815×580×325 910×575×335 887×655×355
Outdoor unit
Net/Gross weight Kg 28/30 39.5/42 40/42.5
Refrigerant type R410A g 700 1050 1100
Design pressure MPa 4.2 4.2 4.2
Liquid side/ Gas side mm Ф6.35/Ф9.53 Ф6.35/Ф 12.7 Ф6.35/Ф12.7
Max. refrigerant pipe
length m
20 20 25
Refrigerant
piping
Max. difference in level
m 8 8 10
Connection wiring No No No
Plug type 16A 16A No plug
Thermostat type Electronic control Electronic control Electronic control
Operation temp
℃
17 ~ 30 17 ~ 30 17 ~ 30
Ambient temp
℃
-15 ~ 50 -15 ~ 50 -15 ~ 50
Application area m2 16-24 20-30 28 ~ 40
Qty’per 20’ /40’ /40'HQ
Set
130/270/300
110/230/265
90/195/220
12
5. Refrigerant cycle diagram
13
6. Wiring diagram
6.1 Indoor Unit
MSY-09HRDN1-QC8, MSY-12HRDN1-QC4, MSY-09HRDN1-QC2, MSY-12HRDN1-QC2,
MSY-18HRDN1-QC2
14
6.2 Outdoor Unit
MOC-09HDN1-QC8, MOC-12HDN1-QC4
MOA-09HDN1-QC2
15
MOB4-12HDN1-QC2
MOC-18HDN1-QC2
16
7. Installation details
7.1 Wrench torque sheet for installation
Outside diameter Torque
mm inch Kgf.m
Ф6.35 1/4 1.8
Ф9.52 3/8 4.2
Ф12.7 1/2 5.5
7.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit 9K 12K 18K
mm2 1.5 1.5 2.5
7.3 Pipe length and the elevation
Pipe size
Capacity
Btu/h
Gas Liquid
Standard
length
(m)
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
9k 3/8’’ (Ф9.52) 1/4’’ (Ф6.35) 5 8 20 30
12k 1/2’’ (Ф12.7) 1/4’’ (Ф6.35) 5 10 25 30
18k 1/2’’ (Ф12.7) 1/4’’ (Ф6.35) 5 10 25 30
Caution:
Capacity is based on standard length and maximum allowance length is base of reliability.
Oil trap should be installed per 5-7 meters.
7.4 Air purging of the piping and indoor unit
Required tools:
Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak
detector.
17
Note:
The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it
will affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit.
Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it
prevents the gas leakage from the refrigeration cycle.
Procedure
1. Recheck the piping connections.
2. Open the valve stem of the 2-way valve
counterclockwise approximately 90’, wait 10
seconds, and then set it to closed position.
Be sure to use a hexagonal wrench to operate
the valve stem.
3. Check for gas leakage.
Check the flare connection for gas leakage
4. Purge the air from the system.
Set the 2-way valve to the open position and
remove the cap from the 3-way valve’s service
port.
Using the hexagonal wrench to press the valve
core pin, discharge for three seconds and then
wait for one minute.
5. Use torque wrench to tighten the service
port cap to a torque of 1.8 kgf.m. (18n.m)
6. Set the 3-way valve to the opened
position.
7. Mounted the valve stem nuts to the
2-way and 3-way valves.
8. Check for gas leakage.
At this time, especially check for gas
leakage from the 2-way and 3-way stem nuts,
and from the service port.
Caution:
If gas leakage is discovered in step (3) above,
take the following measures.
If the leaks stop when the piping connections
are tightened further, continue working from
step (4).
If the gas leaks do not stop when the
connections are retightened, repair the
location of the leak, discharge all of the gas
through the service port, and then recharge
with the specified amount of gas from a gas
cylinder.
18
7.5 Pumping down (Re-installation)
Procedure
1. Confirm that both the 2-way and 3-way valves are set to the opened position.
Remove the valve stem caps and confirm that the valve stems are in the opened position.
Be sure to use a hexagonal wrench to operate the valve stems.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then connect the charge set to the service port of the
3-way valve.
Connect the charge hose with the push pin to the gas service port.
5. Air purging of the charge hose.
Open the low-pressure valve on the charge set slightly to purge air from the charge hose.
6. Set the 2-way valve to the close position.
7. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates
0.1MPa.
8. Immediately set the 3-way valve to the closed position.
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
Disconnect the charge set, and amount the 2-way and 3-way valve’s stem nuts and service
port caps.
Use a torque wrench to tighten the service port cap to a torque of 1.8 kgf.m.
Be sure to check for gas leakage.
19
7.6 Re-air purging (Re-installation)
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to the closed position.
2. Connect the charge set and a charging cylinder to the service port of the 3-way valve.
Leave the valve on the charging cylinder closed.
3. Air purging.
Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare
nut on the 2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tighten the flare nut to 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 until the gauge indicates 0.3
to 0.5 Mpa.
6. Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to
the open position.
Be sure to use a hexagonal wrench to operate the valve stems.
7. Mount the valve stems nuts and the service port cap.
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.
Be sure to check the gas leakage.
20
7.7 Balance refrigerant of the 2-way, 3-way valves
Procedure:
1. Confirm that both the 2-way and 3-way valves are set to the open position.
2. Connect the charge set to the 3-way valve’s service port.
Leave the valve on the charge set closed.
Connect the charge hose with the push pin to the service port.
3. Open the valves (Low side) on the charge set and discharge the refrigerant until the gauge
indicates 0.05 to 0.1Mpa.
If there is no air in the refrigeration cycle [the pressure when the air conditioner is not running is
higher than 0.1Mpa, discharge the refrigerant until the gauge indicates 0.05 to 0.1 Mpa. If this is the
case, it will not be necessary to apply an evacuation.
Discharge the refrigeration gradually; if it is discharged too suddenly, the refrigeration oil still be
discharged.
21
7.8 Evacuation
Procedure:
1. Connect the vacuum pump to the charge set’s centre hose.
2. Evacuation for approximately one hour.
Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or
less].
3. Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the
gauge needle
does not move (approximately 5 minutes after turning off the vacuum pump).
4. Disconnect the charge hose from the vacuum pump.
Vacuum pump oil, if the vacuum pump oil becomes dirty or depleted, replenish as needle.
22
7.9 Gas charging
Procedure:
1. Connect the charge hose to the charging cylinder.
Connect the charge hose which you disconnected from the vacuum pump to the valve at the
bottom of the cylinder.
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. Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
If the system cannot be charge with the specified amount of refrigerant, if can be charged with a
little at a time (approximately 150g each time0 while operating the air conditioner in the cooling
cycle; however, one time is not sufficient, wait approximately 1 minute and then repeat the
procedure.(pumping down-pin).
4. Immediately disconnect the charge hose from the 3-way valve’s service port.
Stopping partway will allow the refrigerant to be discharged.
If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the
air conditioner before disconnecting the hose.
5. Mounted the valve stem caps and the service port
Use torque wrench to tighten the service port cap to a torque of 18N.m.
Be sure to check for gas leakage.
23
8. Electronic function
8.1 Abbreviation
T1: Indoor ambient temperature
T2: Pipe temperature of indoor heat exchanger
T3: Pipe temperature of outdoor heat exchanger
T4: Outdoor ambient temperature
8.2 Display function
8.2.1 Icon explanation on indoor display board.
Lights up when the super ionizer function is energized.
This indicator illuminates when TIMER is set ON/OFF.
This indicator illuminates when the air conditioner starts defrosting
automatically or when the warm air control feature is activated in
heating mode.
This indicator illuminates when the air conditioner is in AUTO
operation.
Usually it displays the setting temperature. It will display the room
temperature when the air conditioner is in FAN only operation. It
will display “SC” when self-clean function is activated. It will also
display the malfunction code or protection code.
This indicator appears only when the compressor is in operation
and indicates the current operating frequency.
24
8.3 Protection
8.3.1 Three Minutes Delay at restart for compressor.
8.3.2 Temperature protection of compressor top.
If the temperature of compressor top is too high (higher than 115℃ and the Over-load Protector is
cut, the units stop. When the Over-load Protector restore and close (lower than 100℃), the
compressor will restart (In this case the compressor is restricted by Three Minutes Delay protection.)
8.3.3 Temperature protection of compressor exhaust.
If the exhaust temp. of compressor is higher than 115℃ and lasts for 5 seconds, the compressor stops
and does not resume until the exhaust temp. is lower than 90℃.
8.3.4 Inverter module Protection, Inverter module Protection itself has a protection function against
current, voltage and temperature. If these protections happened, the corresponding code will
display on indoor unit LED.
8.3.5 Sensor protection at open circuit and breaking disconnection
8.3.6 Fan Speed is out of control. When Indoor Fan Speed is too low (lower than 300RPM for 50
seconds), the unit stops and LED displays failure information and can’t return to normal operation
automatically.
8.3.7 Zero-crossing signal error warning.
If there is no zero-crossing signal in 4 minutes or the interval is wrong, the unit will enter error warning.
8.3.8 For all modes, when the units are turned on, the indoor fan can operate 10 seconds after the
action of louver.
8.3.9 Compressor preheating function.
Preheating permitting condition:
If T4(outdoor ambient temperature)＜3℃ and the machine connects to power supply newly or if T4
＜3℃ and compressor has stopped for over 3 hours, the compressor heating cable will work.
Preheating mode:
A weak current flow through the coil of compressor from the wiring terminal of compressor, then the
compressor is heated without operation.
Preheating release condition:
If T4＞5℃ or user turns on the machine and compressor runs, preheating function will stop.
8.4 Fan-Only Mode
8.4.1 Temperature setting function is disabled, and no setting temperature display.
8.4.2 In this mode, the action of louver is the same as in cooling mode.
8.4.3 The action of auto fan in fan-only mode is the same as auto fan in cooling mode with 24℃
setting temperature.
T1 – 24
mediu
3.
3.
1.
1.
℃
high
low
25
8.5 Cooling Mode
8.5.1 The operation frequency of compressor after starting submits to following rule.
When the machine is running and ΔT(=room temp. – setting temp.) changes, the
frequency of compressor will rise or descend a grade (7 minutes after starting).
After starting, if ΔT stays in a zone for 3 minutes, the frequency will change as follow:
Zone A : Current frequency rise a grade till the maximum grade F8.
Zone B: Keep the current frequency of compressor.
Zone C: Descend the current frequency of compressor until F1.
Zone D: Compressor stops after running as the minimum frequency F1 for 60 minutes or ΔT is
less than -2℃.
8.5.2 Indoor heat exchanger anti-freezing function.
If T2 is lower than 0℃, the compressor stops and resumes when T2>5℃.
8.5.3 Outdoor unit current control in cooling mode.
8.5.4 Rating capacity test function
1) Set the indoor unit with remote controller as: high fan, 17℃ in cooling mode, then press “TURBO”
button on controller 6 times or more within 10 seconds (make sure indoor unit receives these signals),
the machine will turn into rating capacity test mode, the buzzer will make a “di” sound for 2 seconds
continuously. Also, indoor fan will change to rating speed, the frequency of compressor will be fixed
as rating value. Any condition of above is not satisfied, the machine cannot be turned into rating
capacity test mode.
2) The machine will quit from the rating capacity test mode if running for 5 hours or changing fan
speed or setting temperature.
8.5.5 Turbo function(press the “TURBO” button on remote controller)
Elevate current frequency to a higher grade.
D
-1.0
B
1.0
-0.5
0.5
1.5
C
I3COOL
I2COOL
I1COOL
comp. pause
freq. descends if curr. rises;
freq. remains if curr. descends
running normally
outdoor unit
ΔT=(room temp) – (setting
A
26
Indoor fan turns to turbo speed.
After running for 30 minutes the machine will turn back to previous setting mode.
8.5.6 Indoor fan operation rule.
In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low
and auto.
Auto fan in cooling mode acts as follow:
8.5.7 Condenser high temperature protection function(in cooling and drying mode)
If T3＞60℃ for 5 seconds, compressor will stop immediately, and the machine will not resume until T3
＜52℃.
8.6 Drying mode
8.6.1 Indoor fan speed is fixed at breeze grade and can’t be changed. The horizontal angle is the
same as in cooling mode.
8.6.2 Room overlow temperature protection
In drying mode, if room temperature is lower than 10℃, compressor will stop and not resume until
room temperature climbs up to 12℃.
8.6.3 Evaporator anti-freezing protection, condenser high temperature protection and outdoor
unit frequency limit are valid, and they are the same as that in cooling mode.
8.6.4 Horizontal louver action is the same as that in cooling mode.
8.7 Heating mode
8.7.1 Indoor fan action:
Anti-cold-wind function.
If the compressor stops caused by room temperature rising, indoor fan will be forced to run 127
44
38
37
34
33
24
17
setting fan speed
low
breeze
super
fan stop
Evaporator
℃
ΔT=(room temp) –
(setting Temp)
mediu
4.
3.
1.
1.
℃
high
low
27
seconds with breeze. During this period, anti-cold-wind is disabled. After this, anti-cold –wind
function is available.
If the machine runs in rating capacity test mode, indoor fan runs with rating speed, and
anti-cold-wind is disabled.
8.7.2 Indoor fan speed can be set as high, medium, low or auto grade, but anti-cold-wind function
is preferential.
Auto fan action in heating mode.
8.7.3 The operation frequency of compressor after starting submits to following rule:
When the machine runs, if ΔTh stays in a zone for 3 minutes, action of frequency is as
follow:
Zone A: Elevate the current frequency one grade, and not stop until the maximum
grade.
Zone B: Keep the current frequency.
Zone C: Descend the current frequency one grade.
Zone D: Compressor stops after running with F1 for 60 minutes or when ΔTh＞6℃.
8.7.4 Outdoor unit current control in heating mode.
A
5.0
4.5
3.0
2.5
D
C
℃
ΔTh=(room temp) – (setting Temp)
3.5
B
ΔT=(room temp) – (setting
Temp)
mediu
2.5
2.0
1.5
1.0
℃
low
high
28
8.7.5 Indoor heat exchanger high temperature protection.
If T2＞60℃, the compressor will stop and not resume until T2＜48℃.
8.7.6 Defrosting mode.
Condition of defrosting.
Condition 1: If T4＞0℃,
When the units are running, if the following two items are satisfied the units start defrosting:
The units runs with T3＜3℃ for 40 minutes and T3 keeps lower than -6℃ for more than 3 minutes.
The units runs with T3＜3℃ for 80 minutes and T3 keeps lower than -4℃ for more than 3 minutes.
Condition 2: If T4＜0℃,
The program judges according to the condition 1, if the two items are satisfied, then judges if T2 has
descended for more than 5℃, if it has the machine starts defrosting, or continues to judge T2 and will
not defrost until T2 drops more than 5℃.
Condition 3: No matter what value T4 is, if the machine runs with T3＜3℃ for more than 120 minutes
and T3 keeps lower than -2℃ for more than 3 minutes, the machine will defrost, no matter if T2 drops
for more than 5℃ or not.
Condition of ending defrosting.
If any one of following items is satisfied, defrosting will finish and the machine will turn to normal
heating mode.
T3 rises to be higher than 12℃.
T3 rises to be higher than 8℃ and remains for 80 seconds.
The machine has run for 10 minutes in defrosting.
8.7.7 Defrosting action
For MSY-09HRDN1-QC2 and MSY-12HRDN1-QC2
I3HEAT
I2HEAT
I1HEAT
comp. pause
freq. descends if curr. rises;
freq. remains if curr. descends
running normally
outdoor unit
29
For MSY-09HRDN1-QC8 and MSY-12HRDN1-QC4 and MSY-18HRDN1-QC2
8.7.8 Rating capacity test function.
Set the indoor unit with remote controller as: high fan, 30℃ in heating mode, then press “TURBO”
button on controller 6 times or more within 10 seconds (make sure indoor unit receives these signals),
the machine will turn into rating capacity test mode, the buzzer will make a “di” sound for 2 seconds
continuously. Also, indoor fan will change to rating speed, the frequency of compressor will be fixed
as rating value. Any condition of above is not satisfied, the machine cannot be turned into rating
capacity test mode.
o
of
o
of
o
of
o
of
compress
4-way
outdoor
indoor
indoor fan
60s
70s
no longer than 10
30s
F8
30
The machine will quit from the rating capacity test mode if running for 5 hours or changing fan
speed or setting temperature.
8.7.9 Turbo function in heating mode. (press the “TURBO” button on remote controller)
Elevate current frequency (excluding F8) to a higher grade. If indoor fan is in low speed or pause
caused by defrosting or anti-cold-wind function, frequency of compressor will not be elevated one
grade until these limit has been released.
Indoor fan changes to turbo speed and anti-cold-wind function is valid.
8.8 Auto mode function
8.8.1 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＞1℃
Cooling
-1≤ΔT≤1℃
Fan-only
ΔT＜-1℃
Heating
8.8.2 Indoor fan will choose auto speed of relevant mode.
8.8.3 If the machine switches mode between heating and cooling, compressor will keep stopping
for 15 minutes and then rechoose mode according to ΔT.
8.8.4 If the setting temperature is modified, the machine will rechoose running function.
8.9 Forced operation function
8.9.1 Forced cooling and auto function can be carried out through a touch button. In these two
modes, the machine can be changed by remote controller to any other mode at any moment.
8.9.2 When the machine is off, pressing the touch button will carry the machine to forced auto
mode, after this, if 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. In forced operation, remote control is available.
8.9.3 In forced operation mode, all general protections are available.
8.9.4 In forced cooling mode, after running for 30 minutes with compressor frequency F2 and
breeze indoor fan speed, the machine will turn to normal auto mode in which setting temperature is
24℃.
8.9.5 The action of forced auto mode is the same as normal auto mode which temperature is 24℃.
8.10 Action of 4-way valve
For MSY-09HRDN1-QC2 and MSY-12HRDN1-QC2
In cooling, drying, fan-only, or turning off mode, 4-way valve is off, while in heating mode 4-way
valve is on. If the machine changes operation mode from heating mode to some other mode,
4-way valve will be delayed off 2 minutes after compressor stop. For defrosting, please refer to the
passage “defrosting mode”.
For MSY-09HRDN1-QC2 and MSY-12HRDN1-QC2 and MSY-18HRDN1-QC2
In heating, fan-only, standby or turning off mode, 4-way valve is off, while in cooling\drying and
31
forced cooling mode 4-way valve is on. If the machine changes operation mode from heating to
cooling\drying\forced cooling mode, 4-way valve will be delayed off 2 minutes after compressor
stop. If the machine changes operation mode from non-heating mode to heating mode, the 4-way
valve will be turned off immediately.
8.11 Two speeds outdoor fan function
8.11.1 Outdoor fan action in heating mode(including heating in auto mode).
8.11.2 Outdoor fan action in cooling & drying mode(including cooling in auto & forced mode).
Please refer to the pic. above.
8.12 Timer function
8.12.1 Timing range is 24 hours, and the setting time is the relative time.
8.12.2 Timer on.
After turning off, the machine will turn on automatically when reaching the setting time.
8.12.3 Timer off.
After turning on, the machine will turn off automatically when reaching the setting time.
8.12.4 Timer on/off.
After turning off, the machine will turn on automatically when reaching the setting “on” time, and
then turn off automatically when reaching the setting “off” time.
8.12.5 Timer off/on.
After turning on, the machine will turn off automatically when reaching the setting “off” time, and
then turn on automatically when reaching the setting “on” time.
8.12.6 Timer function will be eliminated when the unit is turned off by remote controller.
8.13 Sleep function mode
8.13.1 Operation time in sleep mode is 7 hours. The unit will quit from this mode and be turned off in
7 hours.
8.13.2 In cooling, heating or auto mode sleep function is available.
8.13.3 Operation process in sleep mode is as follow:
After pressing SLEEP button on remoter controller, the machine will get into sleep mode.
When cooling, the setting temperature rises 1℃(be lower than 30℃) every one hour, 2 hour later
the rising stops and indoor fan is fixed as low speed.
When heating, the setting temperature descends 1℃(be lower than 30℃) every one hour, 2 hour
later the descending stops and indoor fan is fixed as low speed, and anti-cold-wind is available.
8.13.4 If user uses timer on function in sleep mode, sleep function will pause and not resume until
reaches the setting on time.
17
15
℃
outdoor temperature
lo
high
outdoor
fan
Outdoor fan action in heating
mode
22
20
℃
outdoor
hig
low
outdoor
fan
Outdoor fan action in cooling & drying
mode
32
8.13.5 When user uses timer off function in sleep mode(or sleep function in timer off mode), if the
timing time is less than 7 hours, sleep function will be cancelled when reaching the setting time. If the
timing time is more than 7 hours, the machine will not stop until reaches the setting off time in sleep
mode.
8.14 Auto-Restart function
In case of a sudden power failure, the indoor main chip will restore the setting conditions before the
power failure. The unit will resume the previous operation setting (including setting mode,
temperature, fan speed, vertical swing) automatically after 3 minutes when power returns.
8.15 Super Ionizer function
Super ionizer function which is controlled through remote controller is available only when the unit is
on.
After the Aircon being turned on, the Ionizer function is switched on when the unit receives CODE
from remote controller at first time, and ionizer is switched off when the unit receives the CODE
again. It’s a circle.
After starting the Ionizer function, the ionizer can work only when the indoor fan motor is running. If
the indoor fan motor is off, the ionizer also stops working, even though the Ionizer function is
available.Ionizer function will not be off when the running mode is switched. Ionizer function will be
off when the unit is turned off.
8.16 Self-clean function
1) Self-Clean function is available only at cooling (including auto-cooling and turbo) and drying
mode, when the user presses down the button ”Self-Clean” on remote controller, “SC” icon will be
displayed on the indoor temperature display area. After running for 13 minutes in low fan mode, the
unit will get into low heating mode (anti-cold wind function is not valid). When the unit keeps low
heating mode for 1 min or evaporator high temp protection occurs, it will stop heating and get into
low fan mode and keep running for another 2 minutes. Then the unit will quit from Self-Clean
function and turn off.
2) When setting the Self-Clean function, the unit has been in Timer or Turbo function, the Timer or
Turbo function will be cancelled and then execute Self-Clean function.
3) When the unit is running Self-Clean function, all other functions will be not available except
swing/air direction/clean air/vent/LED display, and only receiving “Self-Clean” code again or “turn
off” code, the unit will quit from the function.
4) When the unit is running Self-Clean function, all protection functions are valid.
8.17 Follow me function
If the indoor PCB receives the signal which results from pressing the FOLLOW ME button on remote
controller, the buzzer will emit a sound and this indicates the follow me function is initiated. But when
the indoor PCB receives signal which sent from remote controller every 3 minutes, the buzzer will not
respond. When the unit is running with follow me function, the PCB will control the unit according to
the temperature from follow me signal, and the temperature collection function of room
temperature sensor will be shielded, but the error detective function of room temperature sensor will
be still valid.
33
When the follow me function is available, the PCB will control the unit according to the room
temperature (T1) from the remote controller and the setting temperature (TS), and the action of
compressor is as following:
At cooling mode, if T1＜TS, compressor is off; If T1≥TS, compressor is on.
At heating mode, if T1＞TS, compressor is off; If T1≤TS, compressor is on.
The PCB will take action to the mode change information from remote controller signal, but it will not
affected by the setting temperature.
When the unit is running with follow me function, if the PCB doesn’t receive any signal from remote
controller for 7 minutes or pressing FOLLOW ME button again, the follow me function will be turned
off automatically, and the temperature collection function of room temperature sensor will be
available, the PCB will control the unit according to the room temperature detected from its own
room temperature sensor and setting temperature.
8.18 Outdoor heating cable (Optional)
A heating cable can be fixed on outdoor chassis to help deicing and to avoid freezing. Another
heating cable can be fixed around compressor to help starting the compressor. These heating
cables are useful to improve the performance of the air conditioner especially when the outdoor
ambient temperature is very low. The rated power voltage for the heating cables is 220V-240V. The
action of the heating cables is controlled by the PCB. If outdoor temperature is lower than 5℃, the
heating cable will begin to work. If outdoor temperature is higher than 15℃, the heating cable will
stop working.
34
9. Troubleshooting
Safety
Because there are capacitors in PCB and relative circuit in outdoor unit, even shut down the
power supply,
electricity power are still kept in capacitors, do not forget to discharge the electricity power in
capacitor.
Electrolytic Capacitors
(HIGH VOLTAGE! CAUTION!)
Bulb (25-40W)
35
9.1 Indoor Unit Error Display
Display LED STATUS
E0 EEPROM parameter error
E1 Indoor / outdoor units communication protection
E2 Zero-crossing signal error
E3 Indoor fan speed out of control
E5 Open or short circuit of outdoor temperature sensors
E6 Open or short circuit of indoor temperature sensors
E7 Outdoor fan speed out of control
E8 Reset error of Auto Clean filters
P0 IGBT over-strong current protection
P1 Over voltage or too low voltage protection
P2 Temperature protection of compressor top.
P4 Inverter compressor drive error
Note: E4 & P3: Reserved function
36
9.2 Diagnosis and Solution
9.2.1 E0 (EEPROM parameter error) error diagnosis and solution
9.2.2 E1 (indoor / outdoor units communication protection) error diagnosis and solution
9.2.3 E2(zero-crossing signal error) diagnosis and solution
Disconnect the
power supply, after 1 m
inute,
connect the power supply, turn on the unit
with remote controller
Does the unit work
normally?
C
heck the wiring between
indoor and outdoor unit. Is
the connection of L, N, S
and GND good?
Is the GND connection on
outdoor PCB good?
NO
Reconnect and retest
Is the LED4(red) on
outdoor PCB bright and
LED1(yellow) blinking?
Replace outdoor e-box.
The power supply for
outdoor PCB is fail.
Check the wiring on
outdoor PCB comparing
with wiring plate. Is the
Correct the
Replace indoor
PCB and repower
on. Is the failure
Is power supply
and
connection of
connectors good?
Indoor PCB is defective
.
Replace the indoor PCB.
Be sure the power supply is
good and correct the
NO
YES
Circuit or software error on indoor PCB
Replace indoor PCB
37
9.2.4 E3(indoor fan speed out of control) diagnosis and solution
9.2.5 E5(Open or short circuit of outdoor ambient or condenser temperature sensor) diagnosis
and solution.
9.2.6 E6(open or short circuit of indoor room or evaporator temperature sensor) diagnosis and
solution.
9.2.7 P0(IGBT over-strong current protection) diagnosis and solution.
Is the indoor temperature
and evaporator sensor
connector and
connection good?
Repair the connector and
reconnect
Replace the sensor and
check if E6 display
NO
YES
Replace the.indoor PCB
YES
Is the outdoor
temperature sensor
connector and
Repair the connector and
reconnect
Replace the sensor and
check if E5 display
NO
YES
Replace outdoor e-box
YES
Is the
indoor fan motor
connector and
connection good?
Repair the connector and
reconnect
Is voltage being
applied to the fan
motor?
(rang 90v-160v
NO
YES
Indoor PCB is defective.
Replace the indoor PCB.
YES
Replace the indoor fan
motor
NO
38
9.2.8 P1(over voltage or too low voltage protection) diagnosis and solution.
9.2.9 P2(temperature protection of compressor top) diagnosis and solution.
9.2.10 P4(inverter compressor drive error) diagnosis and solution.
Is all connectio
ns on PCB
and between PCB and
compressor good?
Repair or correct the
connector or connection.
Replace the outdoor
PCB and then repower
on. Is the failure
NO
YES
Check the compressor
NO
Is the power supply
Be sure the power supply
is normal when using the
NO
YES
Replace the outdoor
YES
Does
compressor
Is the
connection
Is refrigerant
circulation
volume
NO
NO
Charge
Is abnormality
the same after
gas charging?
NO
Check refrigerant system
(such as clogging of
Reconnect and retest.
NO
YES
Is protector
normal?
Replace the protector.
NO
YES
Check the
outdoor main
PCB. Is there some
Replace the outdoor
YES
39
Is the connection of
compressor good? Is the
wiring sequence right?
Replace the outdoor E-box.
If the problem comes to
again, check coil
resistance of inverter
YES
Replace inverter
Reconnect and retry
NO
NO
40
9.3 Checking for temperature sensors
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor exhaust temp.(Te) sensor.
Measure the resistance value of each winding by using the multi-meter.
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
Some frequently-used R-T data for Te 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
KΩ
℃
41
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