Midea MSV1I-09HRDN1, MSV1I-12HRDN1, M2OA-18HRIN1, M3OA-27HRIN1, M40A-27HRIN1 Schematic

GD Midea Refrigeration Equipment Co.,Ltd
MULTI SPLIT TYPE, HEAT PUMP AIR CONDITIONERS
Technical service manual 2006
R410A Vertu Inverter multi Series
Indoor Models
Outdoor Models
MSV1I-09HRDN1 MSV1I-12HRDN1
M2OA-18HRIN1 M3OA-27HRIN1
M40A-27HRIN1
1
1. Product features
2. Dimensions
3. Refrigeration cycle diagram
4. Operation temperature limits
5. Indoor units combination
6. Wiring diagram
7. Wiring connection
8. Electric control functions
9. Troubleshooting
Annex 1 Characteristic of temp. sensor
Annex 2 Reference data
2
1 Product Features
1.1 Powerful at cooling/heating.
1.2 Low voltage start-up function.
1.3 Anti-icing function at cooling mode.
1.4 Anti-cold air function at heating mode.
1.5 Auto-defrosting.
1.6 Outdoor electric current protection
1.7 Temperature protection of the outdoor compressor top.
1.8 Error self diagnosis function.
1.9 Free connection between indoor and outdoor unit
3
2 Dimensions
2.1 Indoor unit
Dimension
Mode
9K 795 270 165
12K 845 286 165
W H D
2.2 Outdoor unit
a) Outdoor unit M2OA-18HRIN1& M3OA-27HRIN1
335
b) Outdoor unit M4OA-27HRIN1
845
5
3 Refrigeration Cycle Diagram
3.1 Refrigeration circuit drawing of inverter quadplex type
4-way valve
Compressor
Exhaust temp. sensor
Axial flow fan
Condenser
Coil temp. sensor
Auxiliary Capillary
Check Valve
Main Capillary
Capillary A
Capillary B
Capillary C
Capillary C
EXV A
EXV B
EXV C
EXV C
Indoor pipe out temp. seneor A
Indoor pipe out temp. seneor B
Indoor pipe out temp. seneor C
Indoor pipe out temp. seneor D
Outdoor Unit
3.2 Refrigeration circuit drawing of inverter trinary type
Axial
4-way valve
Compressor
Exhaust temp. sensor
flow fan
Condenser
Main Capillary
Coil temp. sensor
Auxiliary Capillary
Check Valve
Capillary A
Capillary B
Capillary C
EXV A
EXV B
EXV C
Indoor pipe out temp. seneor A
Indoor pipe out temp. seneor B
Indoor pipe out temp. seneor C
Filter A
Filter B
Filter C
Filter C
Filter A
Filter B
Filter C
Liquid valve A
Liquid valve B
Liquid valve C
Liquid valve D
Gas valve A
Gas valve B
Gas valve C
Gas valve D
Liquid valve A
Liquid valve B
Liquid valve C
Gas valve A
Gas valve B
Gas valve C
flow fan
Cross
Evaporator
Indoor Unit
flow fan
Cross
Evaporator
Outdoor Unit
Indoor Unit
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3.2 Refrigeration circuit drawing of inverter binary type
Axial flow fan
Exhaust temp. sensor
4-way valve
Compressor
Condenser
Coil temp. sensor
Outdoor Unit
4 Operation Temperature Limits
Cooling mode
Heating mode
Dry mode
EXVA
EXVB
Indoor pipe out temp. seneor A
Indoor pipe out temp. seneor B
Filter A
Filter B
Liquid valve A
Liquid valve B
Gas valve A
Gas valve B
flow fan
Cross
Main Capillary
Auxiliary Capillary
Check Valve
Capillary A
Capillary B
Indoor Unit
Indoor temperature 17~32
Outdoor temperature 0~50
Indoor temperature <=30
Outdoor temperature -15~33
Indoor temperature 10~32
Outdoor temperature 0~50
Evaporator
7
5 Indoor units combination
5.1 M2OA-18HRIN1
Indoor units can be combined by 7000Btu/h 9000 Btu/h 12000Btu/h 7000Btu/h+9000 Btu/h 7000Btu/h+12000Btu/h 9000Btu/h+9000 Btu/h 9000Btu/h+12000Btu/h 12000Btu/h+12000Btu/h 12000Btu/h+18000Btu/h 9000Btu/h+18000Btu/h 7000Btu/h+18000Btu/h
5.2 M3OA-27HRIN1
Indoor units can be combined by 7000Btu/h 9000 Btu/h 12000Btu/h 7000Btu/h+9000 Btu/h 7000Btu/h+12000Btu/h 9000Btu/h+9000 Btu/h 9000Btu/h+12000Btu/h 12000Btu/h+12000Btu/h 12000Btu/h+18000Btu/h 9000Btu/h+18000Btu/h 7000Btu/h+18000Btu/h 7000Btu/h*2+9000 Btu/h 7000Btu/h*2+12000 Btu/h 7000Btu/h*2+18000 Btu/h 7000Btu/h*3 9000Btu/h*2+7000 Btu/h 9000Btu/h*2+12000 Btu/h 9000Btu/h*3 12000Btu/h*2+7000 Btu/h 12000Btu/h*2+9000 Btu/h 12000Btu/h+7000Btu/h+9000Btu/h
5.3 M4OA-27HRIN1
Indoor units can be combined by 7000Btu/h 9000 Btu/h 12000Btu/h
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7000Btu/h+9000 Btu/h 7000Btu/h+12000Btu/h 9000Btu/h+9000 Btu/h 9000Btu/h+12000Btu/h 12000Btu/h+12000Btu/h 12000Btu/h+18000Btu/h 9000Btu/h+18000Btu/h 7000Btu/h+18000Btu/h 7000Btu/h*2+9000 Btu/h 7000Btu/h*2+12000 Btu/h 7000Btu/h*2+18000 Btu/h 7000Btu/h*3 9000Btu/h*2+7000 Btu/h 9000Btu/h*2+12000 Btu/h 9000Btu/h*2+18000 Btu/h 9000Btu/h*3 12000Btu/h*2+7000 Btu/h 12000Btu/h*2+9000 Btu/h 12000Btu/h*3 7000Btu/h+9000Btu/h+12000Btu/h 7000Btu/h+9000Btu/h+18000Btu/h 9000Btu/h+9000Btu/h+18000Btu/h 7000Btu/h+12000Btu/h+18000Btu/h 9000Btu/h+12000Btu/h+18000Btu/h 7000Btu/h*2+9000 Btu/h*2 7000Btu/h*2+9000 Btu/h+12000 Btu/h 7000Btu/h*3+9000 Btu/h 7000Btu/h*3+12000 Btu/h 7000Btu/h*3+18000 Btu/h 7000Btu/h*4 9000Btu/h*2+7000 Btu/h+12000 Btu/h 9000Btu/h*3+7000 Btu/h 9000Btu/h*3+12000 Btu/h 97000Btu/h*4
Remark:
1. One, two, three or four indoor units can be connected according your need;
2. As 18000 Btu/h unit, just Cassette and duct are available.
3. There should be no more two duct indoor units and other indoor units should be all wall mounted in a system;
4. There should be no more one cassette and other indoor units should be all wall mounted in a system;
5. Cassette and duct can not be combined in a system;
6. When heating, capacity attenuate sharply if indoor unit capacity exceed too much.
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6. Wiring Diagram
6.1 Indoor unit
6.2 Outdoor unit M2OA-18HRIN1
10
6.3 Outdoor unit M3OA-27HRIN1
11
6.4 Outdoor unit M4OA-27HRIN1
12
7 Wire connection
7.1 Connection wire specification
Standard
length(mm)
Cores Thickness(mm2) Wire cover
specification
Connection wire between indoor unit and outdoor
6000
(L,N,S,Grounding)
4
1.0
Neoprene
YZW300/500V
unit
Remark: The connection wire between indoor unit and outdoor unit is standard. And it is packaged in the indoor unit.
7.2 Connection wire drawing
Grouding terminal
Wire connection terminal
S
N L
Plug
Tight cincture
120
C5A 21*9*37
magnetism cycle
20±10
Heat retractile pipe
2 Neoprene YZW300/500V
Grounding
1.0mm2
1.0mm2
13
8 Electronic control function
8.1 Protection
1. 3 minutes delay at restart for compressor.
2. Temperature protection of compressor top, compressor stops when the temp. of top of
compressor is more than 120, compressor runs when the temp. of top of compressor is less than 105℃.
3. When AC voltage ≥ 270V for 30 seconds, Outdoor Unit stops operation and alarms.
When AC voltage 260V for 30 seconds, outdoor unit resumes operation.
4. Inverter module protection, Inverter module Protection itself has a protection function
against current, voltage and temperature.
5. Sensor protection at open circuit and breaking disconnection.
6. 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 return to normal operation automatically.
7. 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 return to normal operation automatically.
8. Current protection: When the current is more than 25A, the compressor stops.
9. Outdoor condenser high temperature protection: Under cooling mode, if T3>65 for 3
minutes, the compressor will stop. When T3<52, the protection is not valid.
10. Outdoor low temperature protection: If the outdoor temperature is lower than -15
for 1hour, the compressor and fan motor will stop. If the outdoor temperature is higher than
-12 for 10 minutes and the compressor stops operation for 1h, or the outdoor
temperature is higher than 5 for 10 minutes, then restart and enter into the prior
operation mode.
11. Compressor pre-heating function: When the outdoor temperature is lower than 3
and the compressor stops operation for more than 3 hours, or the outdoor temperature is
lower than 3 and the power is just put on, the compressor enters into pre-heating condition. When outdoor temp. is more than 5 or user operate it, pre-heating condition
will finish.
8.2 Operating mode
8.2.1 Cooling mode
1.Indoor fan keeps running, fan speed can be set in high/mid/low/ Auto:
2.Auto fan at cooling mode: (T=Indoor Temp.-Setting Temp.)
Condition Indoor fan speed
Room temp. up
Room temp. down
T<1.5
1.5<T<4 T>4 T> 3 1<T<3 T<1
Low
Mid.
High
High
Mid.
Low
3.Anti-freezing control to indoor evaporator at cooling mode( T: evaporator temp. )
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Evaporator Temp. Compressor
T< 4 T > 8
Off
On
8.2.2 Dehumidifying mode
1.The indoor fan is fixed in low speed
2. Low room temperature protection:
When room temperature decreases to below 10 , indoor fan stop, when room temperature restores to over 12, indoor fan start.
3. At dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the
same as that of cooling mode.
8.2.3 Heating mode
1. 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
Condition
Indoor fan speed T= Indoor exchanger temp.
Indoor exchanger temp. up
T<34 Off 34℃<T<37℃ Breeze 37℃<T<44℃ Low speed T> 44 Setting fan speed
Indoor exchanger temp. down
T> 38 Setting fan speed 33℃<T<38℃ Low speed 24℃<T<33℃ Breeze T<24 Off
Auto wind at heating mode
Condition
Indoor fan speed
T=Indoor Temp.-Setting Temp.
Room temp. up
T<1.5 High
1.5<T<2.5 Mid. T>2.5 Low
Room temp. down
T<1.0 High
1.0<T<2.0 Mid. T>2.0 Low
15
Indoor evaporator high-temperature protection at heating mode
Condition
Compressor
T= Indoor exchanger temp.
T<48 On 53℃<T<63℃ Decrease frequency of compressor T>63 Off
8.2.4 Defrost operation
1. Defrosting condition: The temperature of outdoor heat exchanger remains consecutively lower than -2°c for more than 40 minutes,
2. Ending condition of defrosting
If one of following conditions is satisfied, end the defrosting and turn into heating mode: a. The defrost time has reached to 10 minutes. b. When the temperature of outdoor heat exchanger rises up to 15°C.
3. Defrosting Actions: a. Compressor runs. b. 4 way valve switches off, c. Outdoor fan switches off d. Indoor fan running according to anti-cold wind function in heating mode.
4. Automatic operation mode The air conditioner automatically selects one of the following operation modes: cooling, heating or fan only according to the temp. difference between room temp. (TA) and set temp. (TS).
TA—TS Operation mode
TA—TS>2 Cooling
-1TA-TS +2 Fan-only TA-TS<-1 Heating (air-only for cooling only type)
8.3 Mode conflict
The indoor units can not work cooling mode and heating at same time. Heating mode has a priority.
8.3.1Definition
Cooling mode Heating Mode Fan Off Cooling mode No Yes No No Heating Mode Yes No Yes No
Fan No Yes No No
Off No No No No
No: No mode conflict; Yes: Mode conflict
8.3.2 Unit action
In case of one Indoor unit working in cooling mode or fan mode, and another indoor unit is set to heating mode, the indoor unit working in cooling mode or fan mode will
16
change to stand by. The outdoor unit will work in heating mode.
In case of one Indoor unit working in heating mode, and another indoor unit is set to cooling mode or fan mode, the indoor unit setting to cooling mode or fan mode will change to stand by.
8.4 Manual switch
Mode changes when push this button. Cooing modeÆ Auto modeÆUnit offÆ Cooing mode At Cooing mode, after 30 minutes cooling operation whose fan speed is set as low, the
A/C operates with a setting temp. of 24. At auto mode, the A/C operates with a set temp. of 24
8.5 Timer Function
1. The maximum length of timer is 24 hours and the minimum resolving power is 15 minutes.
2. Timer on: first turn off the A/C, the A/C will be automatically on at the set time.
3. Timer off: first turn on the A/C, the A/C will be automatically off at the set time
4. Timer on/off function( on time is earlier than off time): first turn off the A/C, it will be
automatically on at set time, and later be off at the set time, then unit turns on at set time.
5. Timer off/on function( off time is earlier than on time): first turn on the A/C, it will be
automatically off at set time, and later be on at the set time, then unit turns off at set time.
8.6 Sleep mode
8.6.1It is available at cooling, heating or auto mode.
8.6.2Cooling:
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.
8.6.3Heating:
The set temperature decrease 1 per hour. Two hours later, the set temperature will
maintain as a constant and the air circulation is kept at low speed (Cold air proof function takes precedence over all).
8.6.4 Auto:
The Sleep Mode running function operates in accordance with selected running mode by auto mode.
8.6.5After 7 hours, unit cancels this mode automatically.
J2 On On Off Off
J3 On Off On Off
Stop time 7 hours 8 hours 6 hours 7 hours
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8.7 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.
8.8 Capacity test frequency locked.
When test the cooling capacity, the frequency can be locked at Rated Frequency by following the below:
1. Set the indoor temp. to 17 and high speed;
2. Push the outdoor check button for 5 seconds, then its frequency can be fixed at Rated
Frequency.
After the test is over, turn off the indoor to exit. When test the heating capacity, the frequency can be locked at 85Hz by following the below:
1. Set the indoor temp. to 30 and high speed;
2. Push the outdoor check button for 5 seconds, then its frequency can be fixed at Rated Frequency.
After the test is over, turn off the indoor to exit.
8.9 Indoor unit indicator displayer
8.9.1 OPERATION indicator
This indicator flashes after power is on and illuminates when the unit is in operation.
8.9.2 AUTO indicator
This indicator illuminates when the air conditioner is in AUTO operation.
8.9.3 TIMER indicator
This indicator illuminates when TIMER is set ON/OFF.
8.9.4 CLEAN AIR indication lamp Lights up when CLEAN AIR feature is activated and Ionizer can generate abundant anions to fill the room with refreshing and natural air.
8.9.5 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.
8.9.6 TURBO indication lamp Lights up when select TURBO function on cooling operation or on heating operation.
8.9.7 FREQUENCY indicator This indicator appears only when the compressor is in operation and indicates the current operating frequency.
8.9.8 TEMPERATURE indicator Usually it displays the temperature settings. When change the setting temperature, this indicator begins to flash, and stops 20 seconds later. It displays the room temperature when the air conditioner is in FAN only operation. When the unit stops operation, it returns to original factory settings.
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Displays the malfunction code or protection code.
8.9.9 FAN SPEED indication lamp Displays the selected fan speed: AUTO(nothing) and three fan speed levels: LOW, MED
and HIGH.
8.10 Outdoor unit LED display function:
1. When stand-by it display number of indoor unit online;
2. When operation it display frequency of outdoor unit;
3. When defrost it display “df”;
4. When a protection or error occurred, it displays error code or protection code.
8.11 Check function:
There is a check button on outdoor pcb. When push this button, the outdoor LED can display in sequence: Capacity demandRunning mode revised capacity fan state No.1 evaporator pipe temp. No.2 evaporator pipe temp.No.3 evaporator pipe temp.No.4 evaporator pipe temp.outdoor pipe temp. Outdoor temp. discharge gas temp.current of outdoor unit No. 1 opening degree of electronic expansion valve No. 2 opening degree of EXV No. 3 opening degree of EXVNo. 4 opening degree of EXVindoor unit numberlast protection/error codecapacity demand(cycle) Explanation for the some display content:
1. Running mode:
Display Corresponding mode 0 Off 1 Cooling mode 2 Heating mode
2. Fan state:
Display Corresponding mode 0 Off 1 Low fan 2 High fan
3. Opening degree of EXV: Opening degree equals the display data times 8;
4. Number of indoor unit The indoor unit that can communicate with outdoor unit normally.
19
8.12 Outdoor fan speed control
There is one fan with two-speed, the fan speed is controlled according ambient temp. After the compressor stop, 30 seconds later the fan stops. When cooling:
Ambient temp.rise
temp.decline
> 27 High speed
<27 Low speed
>25 High speed Ambient
<25 Low speed
When heating:
Ambient temp.rise
temp.decline
> 14 Low speed
<14 High speed
>12 Low speed Ambient
<12 High speed
8.13 Oil return function
If operation frequency is lower than 54Hz in 2 hours consecutively, it will be increased to 62Hz for 3 minutes. Then it recovers to the former operation frequency.
20
9 Troubleshooting for outdoor unit
9.1 Safety
Because of there are capacitors in PCB and relative circuit in outdoor unit, even shut down the power supply, electricity power still are kept in capacitors, do not forget to discharge the electricity power in capacitor. The value of resistance is about 1500 ohm to 2000 ohm
Resistance
The voltage in P3 and P4 in outdoor PCB is high voltage about 310V The voltage in P5 and P6 in outdoor PCB is high voltage about 310V
21
9.2 LED error code display for indoor unit
Display LED STATUS
E0 EEPROM error
E1 Indoor and outdoor unit communication error
E2 Zero-crossing examination error
E3 Fan speed beyond control
E5 Outdoor units temp. sensor or connector of temp. sensor is defective
E6 Indoor units temp. sensor or connector of temp. sensor is defective
P0 Inverter module protection
P1 Outdoor unit voltage protection
P2 Compressor top temperature protection
P3 Outdoor low temp. protection
P4 Inverter compressor drive protection
P5 Mode conflict protection
9.3 LED error code display for outdoor unit
Display Explanation
E0 EEPROM error
E1 No 1 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective
E2 No 2 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective
E3 No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective
E4 Outdoor temp. sensor or connector of temp. sensor is defective
E5 Compressor voltage protection
E6 No 4 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective
E7 Outdoor inverter communication error
P0 Compressor top protection against temperature
P1 High pressure protection (reserve)
P2 Low pressure protection (reserve)
P3 Compressor current protection
P4 Inverter module protection
P5 Outdoor low temp. protection
P6 Condenser high-temperature protection
22
9.3 Trouble shooting
Display LED STATUS
E0 EEPROM error
Temporarily turn off the power supply and turn it on again after 1 minute
Does the trouble occur again?
Replace the indoor PCB
Yes
23
ection to connecto
sor
good
Display LED STATUS
E1 No 1 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective
Is connection to connector of pipe temp. sensor good?
Check the resistance of the temp. sensor according to Annex 1
Replace the sensor
Yes
Display LED STATUS
E2 No 2 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective
Is conn
r of pipe temp. sen
Check the resistance of the temp. sensor according to Annex 1
Replace the sensor
Yes
No
Repair connector
No
Repair connector
Display LED STATUS
E3 No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective
Check the resistance of the temp. sensor according to Annex 1
Replace the sensor
24
Yes
No
Repair connector
Display LED STATUS
E4 Outdoor units temp. sensor or connector of temp. sensor is defective
Is connection to connector of pipe temp. sensor good?
No
Check the resistance of the temp. sensor according to Annex 1
Replace the sensor
Yes
Repair connector
Display LED STATUS
E5 Compressor voltage protection
Check the voltage of power supply, if the voltage is about 220V, turn off the power supply to indoor unit and turn it on again after 1 minute
Does the trouble occur again?
Check the voltage of secondary of T3 transformer in outdoor power board,
is this voltage 12-14V (AC)
Yes
Replace the outdoor power board
No
25
Display LED STATUS
E7 Indoor / outdoor units communication protection
Is the LED in outdoor main PCB light?
Yes
No
Check the signal wires between outdoor
PCB’s, is it connected good.
No
1.Is the +5 voltage in outdoor main board?
Power Board: CN1, Red wire and yellow (GND)
Outdoor main PCB: CZ1
2.Is the +12 voltage in outdoor main board?
Power Board: CN1, Purple wire and yellow (GND)
Inverter module defective.
Rectifier circuit is bad connection or
defective when the voltage in outdoor is
abnormal .
P3 and P4: 310V(DC);
P5 and P6: 310V(DC);
Check the PC521,PC851 (at Outdoor power PCB)
Normally:
Input voltage: <5V, changeable
Output voltage:<24V, changeable
Yes
No
Outdoor power PCB is defective.
Yes
Check the PC817,PC851 (at Indoor main PCB and
outdoor main board)
Normally:
Input voltage: <5V, changeable
Output voltage:<24V, changeable
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Indoor PCB or outdoor main PCB
are defective.
Display LED STATUS
P0 Compressor top protection against temperature
Off: 120; On: 105
Does compressor operate?
No
Yes
Is refrigerant circulation volume normal?
No
Gas charging
Is abnormality the same after gas charging?
Is protector on the top of compressor
normal? Normally the resistance of
the protector is 0 ohm.
Yes
Check the outdoor main PCB.
No
Replace protector
No
Refrigerant system (such as clogging of capillary, clogging of pipe etc)
27
Display LED STATUS
P3 Compressor current protection
Check the resistance of compressor, normally
U and V is 0.6 ohm
U and W is 0.6 ohm V and W is 0.6 ohm
No
Turn one indoor unit only, Does the compressor start after
3 minutes?
No
The compressor is defective
No
Does the trouble occur again after compressor
running some time?
Yes
The compressor is defective
Yes
Check the refrigerant circulation volume and pressure
If refrigerant circulation volume and pressure is OK, change the outdoor main PCB.
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Display LED STATUS
P4 Inverter module protection
Check the connectors CN12, CN7, CN1 in outdoor PCBs Is connection to connector good?
Yes No
Are the wires to compressor right?
Yes
Check the outdoor inverter module.
Is it breakdown between P-N,P-U,P-V;N-W,N-U,N-V
At inverter module
Normally,
P-N: ~1.0MΏ
P-U: ~2.0MΏ
P-V: ~2.0MΏ
P-W: ~2.0MΏ
N-W: ~1.0MΏ
N-U: ~1.0MΏ
N-V: ~1.0MΏ
No
Check compressor
1.Turn on the unit in cooling or heating in different season, use a frequency
meter to test the frequency in one of the three wires to compressor, if there
is frequency in wires, but compressor do not run, the compressor is
defective.
2.Between U,V,W three terminals , the resistance is about 0.6 Ώ.
Repair connector
Yes
Inverter module is defective
29
Display LED STATUS
P5 Outdoor low temp. protection
This is optional, factory standard unit does not have this function.
Unit stops when outdoor temp. is lower than -15°C and lasting time more than 60 minutes, and unit
runs again when outdoor temp. more than -12°C.
Is the outdoor temp. lower than -15°C?
Is the outdoor temp sensor right according to the annex 1
No
Replace the outdoor main board
Yes
Replace the outdoor temp sensor
No
Display LED STATUS
P6 Condenser high-temperature protection
When outdoor pipe temp. is more than 65°C, the unit will stop, and unit runs again when outdoor
pipe temp. is less than 52°C.
Is the outdoor pipe temp. more than 65°C ?
Is the outdoor pipe temp sensor right according to the annex 1
No
Replace the outdoor main board
Yes
No
Replace the outdoor pipe temp sensor
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Annex 1
Characteristic of temp. sensor
Temp. Resistance K Temp. Resistance K Temp. Resistance K
-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 1.830
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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Annex 2
1. Reference voltage data:
a) Rectifier : Input :220-230V(AC), output :310V(DC)
Normally In power board:
P3 and P4: 310V(DC)
P5 and P6: 310V(DC)
b) Inverter module: U,V, W 3ph.
Result
U-V 60-150V(AC)
U-W 60-150V(AC)
V-W 60-150V(AC)
P-N DC 310V
c) Photo-couple PC817, PC851: Control side <+5V, AC side :< 24V(AC)
d) S terminal and N: changeable from 0-24V
2. Check the Diode Bridge component ( In wiring diagram, rectifier)
Remark: If this part is abnormal, the LED will not light.
~ +
Multi-meter
- ~
Result
Forward Resistance Backward Resistance
+ _ Infinite Infinite ~
~
+
~500 ohm Infinite
~ -
~500 ohm Infinite
~
32
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