How it Works
Midea
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MSV1-07CRN1
Schematic
37 pgs2.12 Mb0

Midea MSV1-07CRN1, MSV1-07HRN1, MSV1-09CRN1, MSV1-09HRN1, MSV1-12CRN1 Schematic

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Page 1
MSV1-07CRN1 MSV1-07HRN1 MSV1-09CRN1 MSV1-09HRN1 MSV1-12CRN1 MSV1-12HRN1
Page 2
Page 3
Content
Content
1 Precaution....................................................................................................................1
2 Dimension .................................................................................................................... 5
3 Specification ................................................................................................................6
4 Operation limits ...........................................................................................................9
5 Wiring diagram...........................................................................................................10
6 Installation details......................................................................................................12
6.3 Pipe length and the elevation ............................................................................................................ 12
6.7 Balance refrigerant of the 2-way, 3-way valves ................................................................................. 17
7 Electronic function....................................................................................................20
7.1 Electronic control working environment............................................................................................. 20
7.4 Protection.......................................................................................................................................... 21
7.6 Cooling mode .................................................................................................................................... 22
7.10 Auto mode ....................................................................................................................................... 25
7.14 Ionizer (air clean) function............................................................................................................... 27
8 Model and Parameters ..............................................................................................28
9 Troubleshooting.........................................................................................................29
9.1 LCD Display board ............................................................................................................................ 29
9.4 Resetting phenomenon often occurs during operation...................................................................... 31
9.9 Operation lamp flashes, Timer lamp flashes . ................................................................................... 32
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Page 5
Service manual
1 Precaution
1.1 Safety Precaution
To prevent injury to the user or other people and property damage, the following instructions
must be followed.
Incorrect operation due to ignoring instruction will cause harm or damage. Before service unit, be sure to read this service manual at first.
1.2 Warning
¾ Installation
Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated
circuit.
There is risk of fire or electric shock.
For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized service
center.
Do not disassemble or repair the product, there is risk of fire or electric shock.
Alwa ys ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of control box securely.
There is risk of fire of electric shock.
Alwa ys install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric shock.
Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
Do not modify or extend the power cable.
There is risk of fire or electric shock.
Do not install, remove, or reinstall the unit by yourself (customer).
There is risk of fire, electric shock, explosion, or injury.
Be caution when unpacking and installing the product.
Sharp edges could cause injury, be especially careful of the case edges and the fins on the condenser and evaporator.
For installation, always contact the dealer or an Authorized service center.
There is risk of fire, electric shock, explosion, or injury.
Do not install the product on a defective installation stand.
It may cause injury, accident, or damage to the product.
Be sure the installation area does not deteriorate with age.
If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.
Do not let the air conditioner run for a long time when the humidity is very high and a door or windows is left
Moisture may condense and wet or damage furniture.
Take care to ensure that power cable could not be pulled out or damaged during operation.
There is risk of fire or electric shock.
open.
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Page 6
Service manual
Do not place anything on the power cable.
There is risk of fire or electric shock.
Do not plug or unplug the power supply plug during operation.
There is risk of fire or electric shock.
Do not touch (operation) the product with wet hands.
There is risk of fire or electric shock.
Do not place a heater or other appliance near the power cable.
There is risk of fire and electric shock.
Do not allow water to run into electric parts.
It may cause fire, failure of the product, or electric shock.
Do not store or use flammable gas or combustible near the product.
There is risk of fire or failure of product.
Do not use the product in a tightly closed space for a long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off the gas and open a window for ventilation before turn the
product on.
Do not use the telephone or turn switches on or off. There is risk of explosion or fire.
If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power
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 shock.
supply cable.
Do not open the inlet grill of the product during operation. (Do not touch the electrostatic
filter, if the unit is so equipped.
There is risk of physical injury, electric shock, or product failure.
When the product is soaked (flooded or submerged), contact an Authorized service center.
There is risk of fire or electric shock.
Be caution that water could not enter the product.
There is risk of fire, electric shock, or product damage.
Ventilate the product from time to time when operating it together with a stove, etc.
There is risk of fire or electric shock.
Turn the main power off when cleaning or maintaining the product.
There is risk of electric shock.
When the product is not be used for a long time, disconnect the power supply plug or turn off
the breaker.
There is risk of product damage or failure, or unintended operation.
Take care to ensure that nobody could step on or fall onto the outdoor unit.
This could result in personal injury and product damage.
¾ CAUTION
Always check for gas (refrigerant) leakag e after installation or repair of product.
Low refrigerant levels may cause failure of product.
Install the drain hose to ensure that water is drained away properly.
A bad connection may cause water leakage.
Keep level even when installing the product.
To avoid vibration of water leakage.
Do not install the product where the noise or hot air from the outdoor unit could damage the
neighborhoods.
It may cause a problem for your neighbors.
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Page 7
Service manual
Use two or more people to lift and transport the product.
Avoid personal injury.
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.
¾ Operational
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.
Do not use the product for special purposes, such as preserving foods, works of art, etc. It is
a consumer air conditioner, not a precision refrigerant system.
There is risk of damage or loss of property.
Do not block the inlet or outlet of air flow.
It may cause product failure.
Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
There is risk of fire, electric shock, or damage to the plastic parts of the product.
Do not touch the metal parts of the product when removing the air filter. They are very sharp.
There is risk of personal injury.
Do not step on pr put anything on the product. (outdoor units)
There is risk of personal injury and failure of product.
Always insert the filter securely. Clean the filter every two weeks or more often if necessary.
A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.
Do not insert hands or other object through air inlet or outlet while the product is operated.
There are sharp and moving parts that could cause personal injury.
Do not drink the water drained from the product.
It is not sanitary could cause serious health issues.
Use a firm stool or ladder when cleaning or maintaining the product.
Be careful and avoid personal injury.
Replace the all batteries in the remote control with new ones of the same type. Do not mix old
and mew batteries or different types of batteries.
There is risk of fire or explosion.
Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
They may burn of explode.
If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water. Do
not use the remote of the batteries have leaked.
The chemical in batteries could cause burns or other health hazards.
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Page 8
1.3 Function
Service manual
¾ Indoor unit
1. Operation ON/OFF by remote controller
2. Sensing by room temperature
Room temperature sensor. Pipe temperature
sensor.
3. Room temperature control
Maintain the room temperature in accordance with
the setting temperature.
4. Starting temperature control
Indoor fan is delayed for 5 sec at the starting.
5. Time Delay Safety control
Restarting is for approx. 3 minutes.
6. Indoor fan speed control
Turbo, high, med, low, breeze.
7. Operation indication LCD
Light up in the LCD for each operation mode.
8. Two-direction air vane
The unit will decide the louver direction according
to operation mode.
9. Sleep mode auto control
The fan is turn to low speed (cooling/heating).
The unit will be turn off after seven hours.
10. Independent dehumidification
The function is usually used in rainy days in
springtime or damp areas
11. Self-diag. function
The function will be operate in any operation mode.
12. Air flow Direction control
The louver can be set at the desired position or
swing up and down automatically
13. Auto mode
The unit can be change by the room temperature.
14. Anti-cold function
Prevent the cold wind at the beginning of unit start.
15. Temp. Compensation
16. Defrost mode
17. Auto-restart function
18. Flexible wiring connection
19. Self-Clean
20. Ionizer
The function will be operated by remote
controller
¾ Outdoor unit
1. Power relay control
The unit has 3 mins delay between continuously
ON/OFF operations.
2. Low noise air flow system
Bird tail propeller fan makes the outdoor unit run
more quietly
3. Hydrophilic aluminum fin
The hydrophilic fin can improve the heating
efficiency at operation mode.
4. 4 way valve control
It is only operated in the heating operation mode
except defrosting operation.
5. Anti-rust cabinet
Made from electrolytic zinc steel sheet and anti-rust
coated components.
6. Valve protection cover
It protects the valves and prevents water from
dripping.
7. Discharge pipe temperature
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Page 9
2 Dimension
Indoor unit
Service manual
Dimension Mode
7K 795 270 165 9K 795 270 165
12K 845 286 165
outdoor unit
WHD
Dimension Mode
7K 700 535 285 458 250
9K 780 540 250 549 266
12K 780 540 250 549 266
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WHDL1L2
Page 10
3 Specification
8
0
0
Service manual
Model
Power supply
Capacity Btu/h 7000 7000 9000 9000
Cooling
Heating
Max. current Starting current
Compressor
Indoor fan motor
Indoor air flow (Hi/Mi/Lo) Indoor noise level (Hi/Mi/Lo)
Outdoor fan motor
Outdoor air flow Outdoor noise level Refrigerant type R410A Design pressure
Refrigerant piping
Operation temp Ambient temp Application area
Input W 640 640 820 820 Rated current A 2.8 2.8 3.6 3.6 EER Btu/w.h 10.9 10.9 3.2 , 10.9 3.2 , 10.9 Capacity Btu/h —— 8000 —— 10300 Input W —— 650 —— 840 Rated current A —— 2.9 —— 3.7 COP W/W —— 12.31 —— 12.28
Model PA82X1C-4DZDE PA82X1C-4DZDE PA108X1C-4FTDE PA108X1C-4FTDE Type ROTARY ROTARY ROTARY ROTARY Brand TOSHIBA TOSHIBA TOSHIBA TOSHIBA Capacity Btu/h 6650 6650 8870 8870 Input W 680 680 915 915 Rated current(RLA) A 3.04/2.85 2.85 4 4 Locked rotor Amp(LRA) A 15 15 21.7 21.7 Thermal protector B135-135-241E/MRA1340 Capacitor uF 25 25 25 25 Refrigerant oil ml Model RPG20D RPG20D RPG20D RPG20D Brand Welling Welling Welling Welling Input W 32 32 38 38 Capacitor uF 1.2 1.2 1.2 1.2 Speed(hi/mi/lo) r/min 1040/900/800 1040/900/800 1040/900/800 1040/900/800
Model YDK24-6T YDK24-6T YDK24-6F YDK24-6F Brand Welling Welling Welling Welling Input W 56 56 56 56 Capacitor uF 2.5 2.5 2.5 2.5 Speed r/min 800 800 800 800
Liquid side/ Gas side mm
Max. refrigerant pipe length
Max. difference in level m 5 5 5 5
MSV1-07CRN1 MSV1-07HRN1 MSV1-09CRN1 MSV1-09HRN1
Ph-V-Hz
m3/h 450 450 550 550
dB(A) 36/33/30 36/33/30 38/35/32 38/35/32
m
dB(A) 54 54 54 54
MPa 4.2 4.2 4.2 4.2
m
1, 220-240V~, 50Hz 1, 220-240V~, 50Hz 1, 220-230V~, 50Hz 1, 220-230V~, 50Hz
A5 5 5 6 A 15 15 21.7 21.7
35-241E/MRA1340835-241E/MRA1343
STER OIL VG74 35STER OIL VG74 35TER OIL VG74 350TER OIL VG74 35
3
/h
g R410A/800 R410A/820 R410A/900 R410A/900
m10 10 10 10
℃ ℃
2
1500 1500 1800 1800
Ф
6.35/Ф9.53
17-30 17-30 17-30 17-30 18-43 -7-43 18-43 -7-43 10-14 10-14 14-21 14-21
Ф
6.35/Ф9.53
Ф
6.35/Ф9.53
35-241E/MRA1343
Ф
6.35/Ф9.53
Note:
The noise date is base on hemi-anechoic chamber, during actual operation; these values are
normally somewhat different as a result of ambient condition.
The above design and specifications are subject to change without prior notice for product
improvement.
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Page 11
Model
Power supply
Capacity Btu/h 12000 12000
Cooling
Heating
Max. current Starting current
Compressor
Input W 1090 1100 Rated current A 4.8 4.8 EER Btu/w.h 3.23 , 11.0 3.2 , 10.9 Capacity Btu/h —— 13000 Input W —— 1050 Rated current A —— 4.6 COP W/W —— 12.38
Model PA140X2C-4FT PA140X2C-4FT Type ROTARY ROTARY Brand TOSHIBA TOSHIBA Capacity Btu/h 11567/11618 11567/11618 Input W 1145/1185 1145/1185 Rated current(RLA) A 5.3/5.15 5.3/5.15 Locked rotor Amp(LRA) A 26 26 Thermal protector Capacitor uF 35 35
Service manual
MSV1-12CRN1 MSV1-12HRN1
Ph-V-Hz
A8 8 A26 26
UP3RE0596-T56（INTERNAL：IOL） UP3RE0596-T56（INTERNAL：IOL）
1, 220-240V~, 50Hz 1, 220-240V~, 50Hz
Refrigerant oil ml RB68AF/T68/α68TF: 480 RB68AF/T68/α68TF: 480
Model RPG20D RPG20D
Indoor fan motor
Indoor air flow (Hi/Mi/Lo) Indoor noise level (Hi/Mi/Lo)
Outdoor fan motor
Outdoor air flow Outdoor noise level Refrigerant type R410A Design pressure
Refrigerant piping
Operation temp Ambient temp Application area
Brand Welling Welling Input W 38 38 Capacitor uF 1.2 1.2 Speed(hi/mi/lo) r/min 1260/1080/900 1260/1080/900
m3/h 650 650
dB(A) 40/37/34 40/37/34 Model YDK24-6F YDK24-6F Brand Welling Welling Input W 56 56 Capacitor uF 2.5 2.5 Speed r/min 800 800
Liquid side/ Gas side mm Ф6.35/Ф12.7 Ф6.35/Ф12.7
Max. refrigerant pipe length
Max. difference in level m 5 5
3
m
/h
dB(A) 55 55
g R410A/1050 R410A/1050
MPa 4.2 4.2
m10 10
℃ ℃
2
m
1800 1800
17－30 17－30 17－30 -7－43
18-26 18-26
Note:
The noise date is base on hemi-anechoic chamber, during actual operation; these values are
normally somewhat different as a result of ambient condition.
The above design and specifications are subject to change without prior notice for product
improvement.
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Page 12
Refrigerant cycle diagram
¾ Cooling only
Service manual
¾ Heat pump mode
- 8 -
Page 13
4 Operation limits
Cooling operation
Outdoor unit air temp. DB℃
Service manual
Indoor air temp. DB℃
Note: The chart is the result from the continuous operation under constant air temperature conditions. However, excludes the initial pull-down stage.
Heating operation
Indoor air temp. ℃ DB
Outdoor unit air temp.℃ DB
Note: The chart is the result from the continuous operation under constant air temperature conditions. However, excludes the initial pull-down stage.
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Page 14
Service manual
5 Wiring diagram
MSV1-07CRN1 MSV1-09CRN1 MSV1-12CRN1
Indoor unit:
outdoor unit:
OVE R LOA D RELAY (INTERNAL/
EXT E RNA L DEPENDING ON MODELS)
CO MP RE SS ON
Y E L L OW /G RE E N
M
~
C
BLACK
BL AC K
S
1 2(N)
RE D
R
CO MP RE SS ON
BLU E
CA PA CI TO N
RED
FA N
YE LL OW /GRE E N
BL A CK
M
~
BLUE
F A N CA PA CI T O N
RED
RE D
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Page 15
Service manual
MSV1-07HRN1 MSV1-09HRN1 MSV1-12HRN1
Indoor unit:
outdoor unit:
INDOOR UNIT O U TD OO R U NI T
BL UE
BL UE
F AN MO TO R
3
4
Y& G
4- W AY
BL AC K
RE D
BL UE
1
2(N )
OVERLOAD RELAY
CO MPRES SO R
- 11 -
C
Y&G
BL A CK
BL AC K
R (M)
RE D
S
BL UE
CO MP RES SO R C A P A C I TO R
RE D
RE D
FAN CAPACITOR
Page 16
Service manual
A
6 Installation details
6.1 Wrench torque sheet for installation
Outside diameter
mm inch Kg.m
φ6.35 1/4 1.8 φ9.52 3/8 4.2
φ12.7 1/2 5.5 φ15.88 5/8 6.6 φ19.05 3/4 6.6
Torque
6.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Amp101520
2
mm
1.0 1.5 2.5
6.3 Pipe length and the elevation
Standard
Capacity
Btu/h GAS LIQUID B (m)
7k~12K
16K~28K
30K~36K
3/8’’ (φ9.52) 1/4’’ (φ6.35) 5 5 10 30 1/2’’ (φ12.7) 1/4’’ (φ6.35) 5 5 10 30
1/2’’ (φ12.7) 1/4’’ (φ6.35) 5 8 15 30 5/8’’ (φ15.88) 1/4’’ (φ6.35) 5 10 20 30 5/8’’ (φ15.88) 3/8’’ (φ9.52) 5 10 20 65 5/8’’ (φ15.88) 3/8’’ (φ9.52) 5 15 30 65 3/4’’ (φ19.05) 3/8’’ (φ9.52) 5 15 30 65
Pipe size
length
(m) Elevation Elevation refrigerant
Max. Max. Additional
(m) (g/m)
- 12 -
Page 17
Service manual
In case that more
than 5m.
Caution:
Capacity is base on standard length and maximum allowance length is base of reliability.
Oil trap should be install per 5-7 meters.
6.4 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.
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.
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Page 18
Service manual
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.
5. Set the 2-way valve to the open position and remove the cap from the 3-way valve’s service port.
6. Using the hexagonal wrench to press the valve core pin, discharge for three seconds and then wait
for one minute.
7. Use torque wrench to tighten the service port cap to a torque of 1.8 kg.m. (18n.m)
8. Set the 3-way valve to the opened position.
9. Mounted the valve stem nuts to the 2-way and 3-way valves.
10. Check for gas leakage.
11. 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.
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Page 19
Service manual
6.5 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.
4. Air purging of the charge hose.
Open the low-pressure valve on the charge set slightly to purge air from the charge hose.
5. Set the 2-way valve to the close position.
6. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
7. 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.
8. 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 kg.m. Be sure to check for gas leakage.
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Page 20
Service manual
6.6 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.
3. Leave the valve on the charging cylinder closed.
4. Air purging.
5. 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 minutes; repeat 3 times.
6. After purging the air, use a torque wrench to tighten the flare nut to on the 2-way valve.
7. Check the gas leakage.
8. Check the flare connections for gas leakage.
9. Discharge the refrigerant.
10. Close the valve on the charging cylinder and discharge the refrigerant until the gauge indicate
0.3 to 0.5 Mpa.
11. Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the
open position.
12. Be sure to use a hexagonal wrench to operate the valve stems.
13. 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.
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Page 21
Service manual
6.7 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 0.1 Mpa.
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 a evacuation.
Discharge the refrigeration gradually; if it is discharged too suddenly, the refrigeration oil sill be discharged.
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Page 22
6.8 Evacuation
Service manual
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.
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Page 23
6.9 Gas charging
Service manual
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 ch arge 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 s pecified a mount of re frigerant, 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.
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Page 24
Service manual
7 Electronic function
7.1 Electronic control working environment
Input voltage: 198~253V
Input power frequency: 50/60Hz
Ambient temperature: -7°C+43°C Indoor fan normal working amp is less than 1A
Outdoor fan normal working amp is less than 1.5A
Four-way valve normal working amp is less than 1A
Swing motor: DC12V
Compressor: single-phase power supply. Its normal working amp is less than 15A
7.2 Proper symbols and their meaning
TA: Indoor ambient temperature
TE: Indoor evaporator temperature
TS: Setting temperature through the remote controller
I3sec: Self-protection amp of compressor, continue three seconds until turns off the compressor.
I5MIN: Self-protection amp of compressor, continue five minutes until turns off the compressor.
IFAN: Self-protection amp of outdoor fan/indoor fans when they change from higher wind to lower wind.
IRESTORE: Amp self-protection return value
THDEFROST: High wind, defrosting temperature difference
TMDEFROST: Middle wind, defrosting temperature difference
TLDEFROST: Low wind, defrosting temperature difference
TE1: Anti-cold wind, from Fan Off to Breeze temperature
TE2: Anti-cold wind, from Breeze to Setting Fan Speed temperature
TE3: Anti-cold wind, from Setting Fan Speed to Breeze temperature
TE4: Anti-cold wind, from Breeze to Fan Off temperature
TE5: Evaporator low temperature protection entering temperature
TE6: Evaporator low temperature protection restoring temperature
TE7: Evaporator high temperature protection, compressor off temperature
TE8: Evaporator high temperature protection, fan off temperature
TE9: Evaporator high temperature protection, restoring temperature
- 20 -
Page 25
Service manual
7.3 Function
Remote receiving
Testing and forced running
Position set for indoor unit wind vane
LCD displaying and alarm
Timer On or off
Protection for the compressor
Current protection
High temperature protection of indoor heat exchanger at heating mode
Auto defrosting and heating recovery at heating mode
Anti cold air at heating mode
Anti frozen at cooling mode
Auto restart
Self-Clean
7.4 Protection
7.4.1 3 minutes delay at restart for compressor.
7.4.2 Sensor protection at open circuit and breaking disconnection
7.4.3 Fan Speed is out of control. When Indoor Fan Speed is too high(higher than High Fan+300RPM)or
too low(lower than 400RPM), the unit stops and LED displays failure information and can’t returns to
normal operation automatically.
7.4.4 Cross Zero signal error warning. If there is no Cross Zero signals in 4 minutes, the unit stops and
LED displays failure information and can’t returns to normal operation automatically.
7.4.5 The current protection of the compressor
If compressor turns off for continuously 4 times due to current protection in 5 minutes from Compressor
On, the unit stops and LCD displays failure information and can’t returns to normal operation
automatically.
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Service manual
7.5 Fan only mode
Fan speed is high/mid/low/ Auto
7.6 Cooling mode
The 4-way valve is closed at cooling mode.
The action of the compressor and the outdoor fan:(T=indoor temperature)
Auto fan at cooling mode:
Anti-freezing control to indoor evaporator at cooling mode ( T: evaporator temp. )
Compressor and
outdoor fan on
EVAP. temp. down
Compressor and outdoor
fan off (after 5 mins)
TE5 T
Condenser high temperature protection (only for heat pump)
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TE6
EVAP. temp. up
Page 27
7.7 Dehumidifying mode
Indoor fan speed at low speed.
Protection is same as cooling mode.
Service manual
7.8 Heating mode
7.8.1 Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode. 4-way valve
must delay 2 minutes compared with compressor if the compressor changed into non-heating mode or
turned off. 4-way valve doesn't delay in dehumidifying mode.
7.8.2 Generally, the outdoor fan is turned off with the on-off action of compressor in heating mode, except
for the defrosting mode or the end of defrost.
7.8.3 Action of compressor and outdoor fan motor at heating mode: compressor must run for 7 minutes
after starting and then judge temperature. Meanwhile other protections are still valid.
* This parameter can be changed from 0 to 3
7.8.4 Indoor Fan actions at heating mode
Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller, but Anti-cold wind
function prevails.
Anti-cold wind control function at heating mode (T=indoor exchanger temp.)
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Service manual
7.8.5 Auto wind at heating mode (T=indoor temp.)
7.8.6 Indoor evaporator high-temperature protection at heating mode
(T=indoor exchanger temp.)
The louver opens to Standard Angle ANGLHEAT when power is on for the first time
7.9 Defrosting mode(available for heating mode)
7.9.1 Defrosting condition:
Defrost starts when either of the following:
T3 lower than 0’C, lasts for more than 40 minutes, provided that the time period then the temperature
is lower than -3’C consecutively reaches 3 minutes.
Calculate from the end of latest defrost, evaporator high temp. protection only closes outdoor fan
with the compressor still running. Add up to 90 minutes.
7.9.2 Conditions of defrost ending:
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Page 29
Defrosting ends when either of the following:
The time gets to 10 minutes.
T3>20’C.
The circulation is as following:
7.9.3 Defrosting Actions
Defrost 10 or 6 minutes
Service manual
Compressor
5s
4-way valve
Outdoor fan
Indoor fan
10s
Remark: when the evaporator pipe temperature sensor more th an TE16, the indoor fan start to run.
25s
2s
7.10 Auto mode
7.10.1 The air conditioner automatically selects one of the following operation modes: cooling, heating or
fan only according to the temperature difference between room temperature (TA) and set temperature
(TS).
7.10.2 The indoor fan blows automatically in corresponding selected mode；
7.10.3 The motion of indoor fan’s blade should accord with the selected operation mode；
7.10.4 One mode should be carried out for at least 15 minutes once selected. If the compressor cannot
start for 15 minutes, reselect the operation mode according to the room temp. and set temp., or reselect
when the set temp. varies
7.11 Force cooling function
7.11.1 Select forced cooling function with the forced cooling button or the switch
7.11.2 The compressor is unconditionally turned on, after 30 minutes cooling operation whose fan mode is set as low, the A/C operates at the DRY mode with a set temp. of 24℃
7.11.3 All protections of remote control cooling are available at forced cooling operation
7.11.4 Forced Auto function
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Service manual
Select forced auto function with the forced auto button or the switch. In forced auto status the A/C operates at remote control mode with a set temp. of 24℃
Manual operation is controlled by touching buttons and divided into force cooling and forced auto mode.
It transfer between these two modes by pressing the buttons, the cycling order of the button press is as
below graph show to you.
7.12 Sleep mode
7.12.1 The sleep function is available at cooling, heating or auto mode
7.12.2 Cooling:
The set temperature rise 1 per hour. Two hours later, the set temperature will maintain as a ℃
constant and the fan speed is kept at low speed.
7.12.3 Heating:
The set temperature decrease 1 per hour. Two hours later, th℃ e set temperature will maintain as
a constant and the air circulation is kept at low speed (Anti-cold function takes precedence over all).
7.12.4 Auto:
After an hour running under economic mode, the set temp will rise 1 ,℃ if it is under cooling mode;
the set temp will decrease 1 ,if it is under heating mode; the set temp will be changeless, if it is℃ under
fan-only mode; the condition will be the same after the air conditioner running under economic mode
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Page 31
Service manual
after 2 hours, and during the next time the set temp do not change. The total time is 7 hours, after 7
hours the unit stops.
7.13 Auto restart function
In case of a sudden power failure, this function automatically sets the unit to previous settings before
the power failure when power returns.
7.14 Ionizer (air clean) function
7.14.1 Ionizer (air clean) function is effected when the unit is working and controlled by the remote
controller.
7.14.2 This function is active when the unit received the signal from the remote controller first time and
inactive when received the signal again. Repeat this circle when received signal again.
7.14.3 This function is working only when the indoor fan is working.
7.14.3 This function will not stop when the working mode changed, and be inactive when the unit shut
down.
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Page 32
Service manual
8 Model and Parameters
Model 7K 9K 12K
DELAY_TIME
DEFROST_TIME
I3SEC
I5MIN
IFAN
IRESTORE
IDEFROST
TE1
TE2
TE3
TE4
TE5
TE6
TE7
TE8
TE9
THDEFROST
TMDEFROST
TLDEFROST
ANGLRANGE
ANGLOFF
ANGLCOOL
ANGLHEAT
ANGLCSL
ANGLCSH
ANGLHSL
ANGLHSH
ANGLDL
ANGLDH
ANGLFL
ANGLFH
HSPEEDH
HSPEEDM
HSPEEDL
HSPEEDS
CSPEEDP
CSPEEDH
CSPEEDM
CSPEEDL
CSPEEDS
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127sec 127sec 127sec
7.5min 7.5min 7.5min
7.5 10.0 12.0
6.2 7.5 8.5
5.2 6.0 7.5
4.2 5.0 6.5
3.2 3.5 5.0
28 28 34
32 32 37
30 30 33
26 26 22
4 4 4
10 10 10
60 60 63
53 53 53
50 50 52
15 17 18
16 18 19
17 19 20
196 196 196
100 100 100
180 180 180
22 22 22
8 8 8
40 40 40
8 8 8
40 40 40
8 8 8
190 190 190
50 50 50
155 155 155
1000 1080 1280
900 950 1060
800 800 900
750 750 750
1080 1080 1280
1040 1040 1260
900 900 1080
800 800 900
750 750 750
Page 33
Service manual
9 Troubleshooting
9.1 LCD Display board
ON/OFF indicator
This indicator illuminates when the air conditioner is in operation.
PRE.-DEF. Indicator (For Cooling & Heating models only)
This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control
feature is activated in heating mode.
Turbo indicator
This indicator illuminates when the air conditioner is in turbo operation.
TEMPERATURE indicator
Usually it displays the temperature settings.
TIMER indicator
This indicator illuminates when TIMER is set ON/OFF.
FAN SPEED indicator
This indicator illuminates when change the fan speed.
AUTOCEPHALY AIR EXCHANGING indicator
This indicator illuminates when the indoor air exchange with the outdoor air.
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Service manual
9.2 Indoor Unit Error Display
Display STATUS
E1 EEPROM error
E2 Zero-crossing examination error
E3 Fan speed beyond control
E4 Over current protection of the compressor occurs 4 times
E5 Open or short circuit of Room temperature sensor
E6 evaporator temperature sensor open or short circuit of
9.3 Diagnostic chart
After energizing, no indicator is lighted and the air conditioner can’t be operated.
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Service manual
9.4 Resetting phenomenon often occurs during operation.
(That is automatically entering to the status when power is on.)
The reason is that the instantaneous voltage of main chip is less than 4.5V. Check according to the following procedure:
9.5 Operation lamp flashes and Timer lamp off.
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Service manual
9.6 Operation lamp flashes and Timer lamp on.
9.7 Operation lamp off and Timer lamp flashes
9.8 Operation lamp on and Timer lamp flashes
EEROM error, indoor PCB is defective.
9.9 Operation lamp flashes, Timer lamp flashes .
This is alarm signal when the main chip can’t detect over-zero signal. When such failure occurs, the main control board
must have fault.
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Service manual
Characteristic of temperature sensor
Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ
-10 62.2756 17 14.6181 44 4.3874
-9 58.7079 18 13.918 45 4.2126
-8 56.3694 19 13.2631 46 4.0459
-7 52.2438 20 12.6431 47 3.8867
-6 49.3161 21 12.0561 48 3.7348
-5 46.5725 22 11.5 49 3.5896
-4 44 23 10.9731 50 3.451
-3 41.5878 24 10.4736 51 3.3185
-2 39.8239 25 10 52 3.1918
-1 37.1988 26 9.5507 53 3.0707 0 35.2024 27 9.1245 54 2.959 1 33.3269 28 8.7198 55 2.8442 2 31.5635 29 8.3357 56 2.7382 3 29.9058 30 7.9708 57 2.6368 4 28.3459 31 7.6241 58 2.5397 5 26.8778 32 7.2946 59 2.4468 6 25.4954 33 6.9814 60 2.3577 7 24.1932 34 6.6835 61 2.2725 8 22.5662 35 6.4002 62 2.1907 9 21.8094 36 6.1306 63 2.1124
10 20.7184 37 5.8736 64 2.0373 11 19.6891 38 5.6296 65 1.9653 12 18.7177 39 5.3969 66 1.8963 13 17.8005 40 5.1752 67 1.83 14 16.9341 41 4.9639 68 1.7665 15 16.1156 42 4.7625 69 1.7055 16 15.3418 43 4.5705 70 1.6469
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