1. Product Marketing
Sales Training

2. Course Contents Fundamentals of Inverter Air-Conditioner System
OYL Inverter Product Range
Service / Troubleshooting

3. Fundamentals of Inverter A/C System
Power supply (input) frequency is either 50 Hz
or 60 Hz.
Inverters change the frequency (15 – 100 Hz) to the compressor according to load requirements.
Inverter Compressor operates at different speeds.

4. Fundamentals of Inverter
AC = +/- voltage changes
DC = no voltage changes
U (V)
U (V)
t(s)
t(s)
Vavg = 0
Vavg  0

5. Fundamentals of Inverter
U (V)
U (V)
f = 70 Hz
t(s)
t(s)
f = 50 Hz
Compressor Speed can be varied by
changing the Compressor Input Frequency

6. Fundamentals of Inverter
IN: 240 VAC
f = 50 Hz
Power supply
220~240/1Ph/50Hz
Rectifier
(AC-DC)
Inverter
(DC-AC)
Brushless
Motor
O/D temp sensor
OUT: variable
f = variable
MCU
System control
PWM waveform
Current sensor

7. Difference between AC & DC Inverter
Motor efficiency
Motor control method

8. Motor Efficiency Efficiency Motor Output ＤＣ Efficiency ＡＣ Efficiency
AC total loss
Running loss
Exciting loss
１．０
０．５
［ｋＷ］
［％］
Motor Output ９０ ８０ ７０ ６０ ５０
Efficiency
DC total loss

9. Motor control method DC motor revolution Depend on（Vdc）
VDC Ascent
Comp. Load N1 N2 N3
REVOLUTION
TORQUE
VAC Ascent
AC motor revolution
Depend on freq. (FV curve)
DC motor control method
　　・PAM：Vdc change
　　・PWM：Vdc fix but duty change
　　　　　　　（AVG VDC change）　　　　　　　　　　　　

10. Advantages of Inverter System
Room Temperature comfort
Fast cooling / heating
Less compressor ON / OFF cycle
Low starting current (Soft start)
Improvement in Low Temperature characteristic during Heating mode.
Low energy consumption

11. Room Temperature Comfort
Precise Room Temperature control
Less temperature fluctuation
 0.5 deg Celsius from Set Temperature

12. Fast Cooling / Heating Quick ramp-up of compressor speed.
Enables A/C to reach set temperature faster.

13. Less ON / OFF cycle
Once Set Temperature is reached, Inverter compressor still runs BUT at lower frequency.
Conventional compressor will STOP.
Therefore, ON/OFF strain for inverter compressor is less, making it lasts longer.
Compressor capacity
Full capacity
Conventional compressor
ON OFF ON OFF ON OFF
Time

14. Low Starting Current
Inverter compressor start-up at lower frequency, then quickly ramps up.
Starting current is lower.
Running current
Hours of operation
Conventional air conditioner:
High starting current
Frequent on/off cycle
Inverter air conditioner:
Low starting current
Smooth operation

15. Improvement in Low Temperature Characteristics
i) During low ambient temperature the inverter unit will run at max frequency which the capacity will improve compare with normal fix compressor unit
ii) During defrost, the inverter unit will run at max frequency thus the defrost time will be less.

16. Low Energy Consumption
Most Frequently
Used Area
Inverter

17. OYL Inverter Product Range
Available for R22 (AC) and R410A (DC)
Single – split & Multi-Split
Wall-mounted, Ceiling Cassette, Ceiling Convertible, Ceiling Concealed.

18. OYL Inverter Product Range
Indoor Wall – Mounted
(5)WMX10/15/20/25G(R)

19. OYL Inverter Product Range
Indoor Ceiling Cassette
(5)CKX10/15/20C(R)
(5)CKX20/25A(R)

20. OYL Inverter Product Range
Indoor Ceiling Convertible
(5)CMX15/20/25E(R)

21. OYL Inverter Product Range
Indoor Ceiling Concealed
(5)CCX10/15/20/25C(R)

22. Inverter Product Range
Outdoor Condensing C – Series (Single-split)
5SLX10/15/20/25C(R)

23. Inverter Product Range
Outdoor Condensing A – Series R410A
(Multi-split DC Inverter)
5MSX20/25/30A(R)

24. Inverter Product Range
Outdoor Condensing A – Series R22
(Multi-split AC Inverter)
MSV25/35A

25. Inverter Product Range
Specifications (Single – Split) R410A DC Inverter

26. Inverter Product Range
Specifications (Single – Split) R410A DC Inverter

27. Inverter Product Range
Specifications (Multi – Split) R410A DC Inverter

28. Inverter Product Range
Specifications (Multi – Split) R22 AC Inverter

29. Inverter Product Range

30. Installation Wiring Installation
i) Additional signal wire (Low voltage LIVE)
ii) Power supply : 3 wires
iii) Indoor to outdoor : 4 wires (including E)
vi) Earth wires must be connected for indoor and outdoor unit.

31. Installation Wiring connection INDOOR OUTDOOR 1 – Comp 2 – Neutral3 N L L 1 N 2
Signal 3
Earth
OUTDOOR
1 – Comp
2 – Neutral
3 – Signal
MCB / ELCB
Power Supply

32. Protection Algorithms
A) Current Control
Total Current
Compressor stops I1
Frequency 1 step down I2
Maintain Frequency I3
Frequency 1 step up

33. Protection Algorithms
b) Compressor discharge temperature
Compressor Discharge Temperature
115°C
Compressor stops
Frequency 1 step down
Frequency 1 step up
Maintain Frequency
108°C
95°C

34. Protection Algorithms
c) Starting control
Freq C
Freq 6
4 min
1 min
When target frequency > Freq 6,
Freq 6 for one min.
When target frequency > Freq C
Freq 6 for one min and at Freq C for 1 min

35. Protection Algorithms
c) Starting control

36. Protection Algorithms
c) Starting control

37. Trouble-shooting AIR – CONDITIONAL PROBLEMS
Insufficient Cooling/Heating
Starting or running failure
Refrigerant circuit problem
Electrical circuit problem

38. Trouble-shooting Diagnoses by use of pressure gauge
Pressure measurement
To troubleshoot the refrigerant circuit pressure gauge is one of the important tooling
Both of the LP and HP must closed for pressure measurement
Refrigerant charging
Vacuuming

39. Insufficient cooling Insufficient Cooling Unit Starts
High cooling load
Refrigerant circuit
Leakage
Restriction e.g at strainer, capillary, filter dryer, etc
Compressor
Less or no compression (Low running current)
Excessive heat source e.g. electric kettle
Room overcrowded with people
Windows/ doors wide open
Check air circulation
Indoor/Outdoor coil dirty (clogged)
Air filters dirty
Fan malfunction
Obstruction at air inlet/outlet of indoor/outdoor unit
Satisfactory operation with temperature difference of air intake & discharge of indoor unit 10ºC - 15ºC
Restriction e.g.. at strainer, capillary, filter dryer, etc

40. Insufficient Heating Insufficient Cooling Unit Starts
High cooling load
Refrigerant circuit
Leakage
Restriction e.g at strainer, capillary, filter dryer, etc
Compressor
Less or no compression (Low running current)
Windows/ doors wide open
Check air circulation
Indoor/Outdoor coil dirty (clogged)
Air filters dirty
Fan malfunction
Obstruction at air inlet/outlet of indoor/outdoor unit
Satisfactory operation with temperature difference of air intake & discharge of indoor unit 10ºC - 15ºC
Insufficient Heating
High Heating load
Restriction e.g.. at strainer, capillary, filter dryer, etc
Satisfactory operation with temperature difference of air intake & discharge of indoor unit 16ºC - 25ºC

41. Pressure conditions

42. Pressure table definition
Note: Outdoor air ºC DB
Indoor air ºC DB/ 19.5ºC WB

43. Excessive refrigerant
Causes
For systems with EXV
Improper expansion valve adjustment.
Poor installation of feeler bulb.
Overcharged refrigerant.
For systems with capillary tube
Overcharged refrigerant

44. Insufficient refrigerant
2 types
amount of refrigerant in the system is not enough.
amount of refrigerant passing through expansion device is not enough
Possible causes
undercharge refrigerant
refrigerant leak
choked filter, drier
faulty expansion device

45. Excessive condensing pressure
Possible causes
air flow short circuit
insufficient air flow
partially blocked condenser
presence of air or non-condensable gases in the system.
operation beyond upper ambient temperature limits

46. Electrical circuit trouble-shooting
Electrical circuit problem
Key components functioning checking
Controller for different models
Troubleshooting steps for the inverter controller

47. Required Tools Clamp meter DC CURRENT AC CURRENT FREQ RESISTANCE VDC
VAC
LIGHT

48. Required Tools Multi-meter RESISTANT VDC CONTINUITY DC CURRENT VAC
AC CURRENT

49. Key Components - Capacitor
Terminal
Functions
To smoothen the DC bus for the inverter board
Testing
Use multi-meter to check the conductivity of the terminal
Problems
Caused by over voltage
Electrolyte dried up causing it malfunction
High ambient working condition

50. Key Components – Bridge Diode
Function
To rectifier the AC source to DC source
Testing
Use multi-meter to check the conductivity
of the terminal. Normally, 0.4V – 0.6V or KΩ
Problems
Caused by over voltage
Working ambient to high + ~ -

51. Key Components - Reactor
Function
Introduce at the inverter circuit to compensate
for reactive power and improve power factor
Testing
Resistance should be around 0.4Ohm
If the conductivity is open loop mean the reactor failure
Coil/steel plate and external bracket resistance should infinite
No obvious burn marks

52. Key Components - PTC Function Due to high capacitor charge current
during start up, the PTC electronic starter
and relay combination acts to cushion the
excessive charge current
Testing
Resistance of the PTC on sheet metal at
ambient temp is 40±20% Ohm

53. Key Components - Sensors
I) Sensor as an ADC input value for the controller
II) The Longertech sensor value (yellow socket) is different with the OYL inverter sensor
III) Sensor value for the sensor can be measured using multi-meter in 2 form. Resistance value (no PCB running) or Vdc value
IV) For Vdc value checking, the value get from multi-meter need to minus by 5Vdc before refer to the table
V) For resistance value checking, the value can refer directly

54. All the value same for discharge, room and coil
Sensor values
Longertech sensor value
25ºC
5.2860kOhm
2.3533Vdc
Room/ coil Sensor
25ºC
KOhm
1.2830Vdc
Discharge Sensor
OYL sensor value
25ºC
10.00kOhm
1.45Vdc
All the value same for discharge, room and coil
Example: Measured from multi-meter is 3.27KOhm.
5.00KOhm KOhm = 1.728KOhm
From the table, 1.728KOhm convert back to 35ºC

55. Control board – 5SLX10/15C BRIDGE DIOD POWER BOARD E - CAPACITOR IPM
MCU
TERMINAL BLOCK
REACTOR

56. Control board – 5SLX20/25C BRIDGE DIOD POWER BOARD E - CAPACITOR IPMCU
TERMINAL BLOCK
REACTOR

57. Control board – MSV25A IPM POWER BOARD FAN CAPACITOR BRIDGE DIOD
PFC CAPACITOR
E - CAPACITOR
TERMINAL BLOCK

58. Control board – MSV35A BRIDGE DIOD POWER BOARD IPM FAN CAPACITOR
PFC CAPACITOR
E - CAPACITOR
TERMINAL BLOCK
CONTACTOR
PTC
FUSE

59. Control board – 5MSX20/25/30A PFC POWER BOARD IPM FAN CAPACITOR
TERMINAL BLOCK
REACTOR

60. Error Codes Indoor Error Codes - I/D LED Blinking Outdoor Error Codes
- Compressor Running LED Blinking
- Compressor Stopped LED Blinking

61. Troubleshooting Methods
Error Codes – (5)WMX-G
LED
Fault Indications
Troubleshooting Methods 1 2 3 4 ●
Defrost Operation (Red)
Ignore
I/D Sensor Error (Yellow)
Check I/D Sensor wire and value (~5kΩ)
Coil Temp. Sensor Error
Check Coil Sensor wire and value (~5kΩ)
O/D Temp. Sensor Error
Refer O/D Unit
Compressor Overload
IPM Error
O/D Current Trip
Compressor Overheat / Gas Leak
I/D Fan Feedback Error
Check I/D Fan Wire
Communication Error
Check Wiring

62. Error Codes – Outdoor Compressor Running LED Blinking Blinks
Blinking Indication 1
Normal Running, with no limitation 2
Voltage Limit 3
Cooling unit : Outdoor Coil Temperature Limit
Heating unit : Indoor Coil Temperature Limit 4
Total Current Limit 5
Discharge Temperature Limit 6
Cooling unit : Indoor Coil Temperature Limit 7
Indoor Fan Control 8
Outdoor Frequency Adjustment

63. Troubleshooting Methods
Error Codes – Outdoor
Compressor Stopped LED Blinking
Blink
Fault Indications
Troubleshooting Methods 1
O/D Ambient Sensor Error
Check O/D Ambient Sensor Wire & Connection 2
O/D Coil Sensor Error
Check O/D Coil Sensor Wire & Connection 3
O/D Disc. Sensor Error /
Comp. Overheat
Check O/D Disc Sensor Wire & Connection;
Check Pressure & Compressor 4
DC Comp. Feedback Error
Check Comp. Wire & Feedback Wire
(Not applicable for A/C Inverter) 5
Communication Error
Check Communication Wire & Connection
for both I/D & O/D 6
Over Current Error
Check Total Current; Check Pressure & Compressor 7
No Load
Not Applicable 8
Over / Under Voltage
Check Power Supply 9
DC Comp. Start Failure
Check Comp. Wire & Feedback Wire; Check Compressor

64. Troubleshooting Methods
Error Codes – Outdoor
Compressor Stopped LED Blinking
Blink
Fault Indications
Troubleshooting Methods 10
Cooling Overload
Check Pressure 11
Defrost
Ignore 12
IPM Protection
Check Power Supply;
Check Main Board / Filter Board;
Check Bridge Diode;
Check IPM Board;
Check Compressor 13
Read EEPROM Error
Check EEPROM Chip Connection 14
Write EEPROM Error 15
DC Fan Motor Feedback Error 16
AC Peak Current Error 17
O/D Suction Sensor Error
Check O/D Suction Sensor Wire & Connection
(Applicable only for Heat Pump Unit)

65. Troubleshooting Methods
Error Codes – Outdoor
Compressor Stopped LED Blinking
Blink
Fault Indications
Troubleshooting Methods 18
None
Ignore 19
DC Comp. Speed Control Error
Check IPM Board; Check Compressor; 20 21
O/D Suction Pipe A Sensor Error
Check Suction Pipe A Sensor Wire & Connection 22
O/D Suction Pipe B Sensor Error
Check Suction Pipe B Sensor Wire & Connection 23
O/D Suction Pipe C Sensor Error
Check Suction Pipe C Sensor Wire & Connection 24
O/D Suction Pipe D Sensor Error
Check Suction Pipe D Sensor Wire & Connection 31
Communication Error with I/D A
Check Communication Wire & Connection with I/D A 32
Communication Error with I/D B
Check Communication Wire & Connection with I/D B 33
Communication Error with I/D C
Check Communication Wire & Connection with I/D C 34
Communication Error with I/D D
Check Communication Wire & Connection with I/D D

66. Power supply checking Single split inverter
Use multi-meter to check the power supply to the controller
Single split refer 1 & 2 and multi split refer L & N
Supply around 220 ~ 240VAC
Multi split inverter

67. Fuse checking Use multi-meter to check the continuity of the fuse
Fuse with sound ‘BEEP’ is ok
Fuse with OL for the resistance and no ‘BEEP’ is nok

68. Communication wires checking
Use multi meter to check the communication line between indoor and outdoor
Signal (3) line references to neutral (2). Check VDC for signal and neutral
The VDC will fluctuate to show the communication transmit between indoor and outdoor

69. Bridge Diode AC Voltage Checking
Use multi-meter to check the AC voltage across the bridge diode
Supply around 220 ~ 240VAC

70. Electrolytic Capacitor Checking
Use multi-meter to check the DC voltage across the E-CAP
In normal case the value should around Vdc

71. 5SLX 10/15CR & MSV 25/35A (LONGERTECH)
Bridge Diode Continuity Checking
5SLX 10/15CR & MSV 25/35A (LONGERTECH) + ~ -
(Diode ~ 0.4 – 0.6V)
Use multi-meter to check the continuity of the bridge diode
The value must around 0.4 – 0.6V or kΩ
The bridge diode with ‘BEEP’ sound is nok

72. Bridge Diode Continuity Checking+
Result show in kΩ OK OK
Multi-meter will show value in one direction and OL in another direction when we change the multi-meter direction.
If both direction show value means the bridge diode already short

73. If both direction show value means the bridge diode already short
Bridge Diode Continuity Checking OK OK + + OK NG + +
If both direction show value means the bridge diode already short

74. Bridge Diode Vdc value checking+
Result show in Vdc
Same with the result show in kΩ, multi-meter will show value in one direction and OL in another direction when we change the multi-meter direction.
If both direction show value means the bridge diode already short

75. Bridge Diode Vdc value checking+ +
Same with the result show in kΩ, multi-meter will show value in one direction and OL in another direction when we change the multi-meter direction.
If both direction show value means the bridge diode already short

76. Bridge Diode Vdc value checking
Use multi-meter to check the connectivity of the bridge diode
The bridge diode with ‘BEEP’ sound is nok
Value Ω is OK
Value KΩ is OK
5SLX 10CR/15CR (OYL)
5SLX 20/25CR & 5MSX 20/25/30AR

77. PFC BOARD FOR 5SLX 20/25CR & 5MSX 20/25/30AR
IGBT
Please check the IGBT and DIODE with multimeter
DIODE

78. Using multimeter with continuity function.
Multimeter show OL means ok
If Multimeter show value around 0Ohm ~ to few Ohm and with the “BEEP” sound means diode short already and the PFC need to be change

79. Using multimeter with continuity function.
Multimeter show OL means ok
If Multimeter show value around 0Ohm ~ to few Ohm and with the “BEEP” sound means IGBT short already and the PFC need to be change

80. IPM DC Voltage Across Checking
Use multi-meter to check the DC voltage across the IPM
The value should around 270 – 330VDC depends on the PFC it used

81. Intelligent Power Module (IPM)
+ & - from the DC bus
U, V, W to compressor
U V W

82. If both direction show value means the bridge diode already short+ - OK
NOK
NOK + - + -
If both direction show value means the bridge diode already short

83. Compressor connectivity checking between the terminal
Use multi-meter to check the connectivity between the terminal
The multi - meter should have “BEEP” sound to show the winding short
If the multi-meter show OL means the winding of compressor burn or short

84. Compressor connectivity checking
Use multi-meter to check the connectivity between the body and terminal
The multi-meter should show OL
If the ‘BEEP’ sound shown means the compressor short

85. Diagnostic Tool Interceptor For Inverters
Including AC and DC Inverters
Single-Splits & Multi-Splits

86. Interceptor Capability
Intercepts or captures communication signals within the inverter electronics nervous system.

87. Hardware Installation Schematic
Single-split
Multi-split

88. Features Displays Operating Parameters
Temperature Readings for ALL sensors
Outdoor Air Temperature
Outdoor Coil Temperature
Indoor Air Temperature
Indoor Coil Temperature
Indoor Set Temperature
Compressor Discharge Temperature

89. Display Operating Parameters

90. Features Compressor EXV Operating Mode for both Indoor and Outdoor
Running Frequency
EXV
Number of Pulses
Status
Operating Mode for both Indoor and Outdoor
Indoor Fan Speed

91. Features Data Logging Data Storage & Transmission
Graphical Representation

92. Data Logging “Set-and-Forget”
Once program is started properly, data is collected automatically.
There is no need for constant human monitoring.
Monitoring period is limited only by free hard disk space.
BUT ensure constant power supply during the entire monitoring period.
Power-Saving Features must be Disabled.

93. Data Storage & Transmission
Data is stored as .ice files in the computer.
Useful for future reference.
Data Transmission
.ice files can be transmitted by back to OYL for further analysis.
All parameters can be converted and manipulated using 4 different formats.
Text
XML
HTML table
Excel

94. Graphical representation
All parameters can be shown in graph form (time-based) for easier understanding.
Graph can be customized e.g. Titles, Colours, Types of Axis, etc.
Ability to export to
Metafile
Bitmap
JPG
GIF
PCX
One-Click to Send by
Useful to generate Service Reports

95. Graphical representation

96. Graphical representation

97. Interceptor sales package
CD-ROM containing
Interceptor Installation Program
Hardware Installation Manual
Software Manual
Extras (required for full functionality)
Adobe Acrobat Reader 6.0
Internet Explorer 6.0 SP1
Microsoft DotNet Framework

98. Interceptor sales package
Interceptor Module
RS232 Serial Connection Cable

99. Computer requiremets
Notebook or Desktop Computer with built-in RS232 Serial Port
Microsoft Windows XP Professional
Minimum 128 MB RAM
Minimum 50MB of Hard Disk Space

100. Thank you