1. TECHNICAL TRAINING INVERTER-Y
K-Series
ALGORITHM

2. INDOOR BASIC FUNCTIONS

3. OPERATING MODES
The system has 5 operating modes. The mode selection is done from indoor using handset.
The operating modes are:
Cool
Heat
Fan
Auto
Dry

4. THERMOSTAT CONTROL Cooling Heating T -0.5C C Fan speed
remains unchanged B
-2C
-2C A
0C
1.5C T
Heating A B
Fan speed changes to
lower rpm (300rpm) C

5. THERMOSTAT CONTROL OFF condition: ON condition: T falls in Zone A.
T is above Zone C after being in Zone A.
Unit resumes operation from defrost control.
Operation is turned ON in any zones except A.
The monitoring time has passed while T is in Zone B:
Cooling/dry mode – 10 minutes.
Heating – 10 seconds.

6. FAN MODE 6 fan setting buttons can be set using handset:
Silent, L, ML, M, MH & H.
Silent is at LL step.
When auto fan mode is selected:
Cooling: L, ML, M, MH, H
Heating: LL, L, ML, M, MH, H
Dry: L
Powerful: H + 80rpm

7. AUTO MODE For heat pump only Mode switching point:
Heating  Cooling
Tr ≥ Ts + 2.5
Cooling  Heating
Tr ≤ Ts – 2.5
During initial operation
Cooling operation: Tr > Ts
Heating operation: Tr < Ts
Ts C
Thermostat OFF
Ts C
Ts C
Ts C
Heating
operation
Cooling

8. NIGHT SET MODE Cut in when OFF timer is set.
Maintain the air flow setting by user.
Cooling
0.5C
1 hour
2.0C
Heating
OFF timer
Night set circuit ON
Temperature
shift
Unit stops at the set hours

9. ECONO MODE Maximum power consumption is limited to 700W.
Can be activated while unit is running in Cool, Heat, Dry or Auto.
Once this function is activated, the input current upper limit is applied.

10. POWERFUL OPERATION To set the unit to run in full capacity.
Indoor fan speed and compressor frequency is increased.
Fan speed and target set temperature will be adjusted as follows for a 20 minute duration:
Mode
Fan speed
Target Ts
Cool*
H + 80rpm
18C
Dry
L + 80rpm
Ts (dry) - 2.5C
Heat*
30C
Fan -
Auto
Same as *
Unchanged

11. OUTDOOR BASIC FUNCTIONS

12. OVERVIEW Generally, compressor rotation is controlled within 5
zones: stop, drop, keep, up and reset subjected to a
particular operating temperature/current/pressure.
Zone
Control
Stop
Compressor is stopped when a certain limit reaches the stop zone for abnormality correction.
Drop
Frequency will be dropped with a timer setting.
Keep
Frequency is maintained at lower/upper limit. Up
Frequency will be increased with a timer setting.
Reset
Frequency lower/upper limit is canceled and returned to command rotation.

13. GENERAL FUNCTIONS

14. THERMISTORS Thermistor Location Outdoor coil A Discharge pipe B
Indoor coil C
Outdoor air 
Heat sink

15. MINIMUM RUN CONTROL To prevent frequent compressor ON/OFF & to
allow pressure equalization
The compressor will be on 3 minutes stand-by after turning OFF before it is allowed to turn ON.
OD fan OFF delay to improve pressure equalization & to prevent refrigerant from entering into evaporator.
Applicable for the whole range

16. AUTO RESTART Factory pre-set.
Allow unit to automatically resume the same operating mode it was in before a power failure.
Applicable for the whole range

17. 4-WAY VALVE CONTROL
OFF delay of 160 second is applied when unit is turned OFF and heating is stopped.
Operating mode
4-way valve is
Heat, except for defrost ON
Cool
Dry
Defrost
OFF
Applicable for the whole range

18. DEFROST CONTROL Condition for entering defrost
Compressor minimum run time – 6 minutes AND
Accumulated run time > 28 minutes since the start or end of a previous defrost cycle.
Similarly based on OD coil & OD air temperatures.
Condition for terminating defrost
Minimum run time of 60 seconds, THEN
4  OD coil  22C or
Total defrost timer of 690 seconds.

19. DEFROST CONTROL ON OFF Compressor ON OFF 4-way valve ON OFF Fan EXV
60 second
690 second ON
OFF
Compressor ON
OFF
4-way valve ON
OFF
Fan
430 pulse
EXV
400 pulse
Start
End

20. OUTDOOR FAN CONTROL This control is carried out according to:
During defrost.
During powerful mode.
During quite mode.
During cooling/heating operation.
When compressor stops, fan OFF delay 70 seconds is carried out for maintaining pressure difference.

21. PREHEATING OPERATION CONTROL
Subjected to Control A and B:
Control A – OD air  7C
Enter
End
Td < 10C AND
Tfin < 85C
Td > 12C AND
Tfin  90C
Control B – OD air < 7C
Enter
End
Td < 20C AND
Tfin < 85C
Td > 22C AND
Tfin  90C
The compressor power consumption is only 35W.

22. INDOOR COIL FREEZE PREVENTION
Only available in cooling mode.
Activation only after 2 second from the start of unit operation.
13C
Reset zone
Drop zone
9C
11C
Up zone
7C
0C
Stop zone
Keep zone
Return from stop

23. ROTATION REGULATING FUNCTIONS

24. OVERVIEW Upper limit rotation Command Rotation Limit Rotation
Target Rotation
Starting Rotation T
Defrost*
Lower limit rotation
* Defrost control for heat pump model only

25. STARTING ROTATION

26. STARTING CONTROL
To avoid excessive oil discharge from compressor or to promote oil lubrication during startup.
To prevent liquid flood back to the compressor.
To limit starting current.
When compressor starts to rotate from OFF to ON, compressor rotation is set to run gradually to each upper limit at a specific timer setting.

27. STARTING CONTROL Model Cooling Heating Min. f Max. f 5LCY10ER-5WMY10KR
66 Hz
92 Hz
24 Hz
5LCY15ER-5WMY15KR
90 Hz
98 Hz
28 Hz
Compressor
rotation, f 90 72 58
Time (second)
180
180 10
Applicable for 5LCY Series I

28. COMMAND ROTATION

29. COMMAND ROTATION Cut in upon termination of Starting Control.
Achieve capacity control by controlling the compressor rotation based on :
Temperature difference between set and room temperature, T.
Limit Rotation.
Defrost control.

30. COMMAND ROTATION PI CONTROL Based on P control & I control.
P control: T of each indoor is calculated at every sampling time of 20s and compressor rotation is adjusted according to the difference from the previously calculated rotation.
I control: if the operating frequency is not changed more than a certain fixed time:
If T is small  lower frequency.
If T is large  increase frequency.

31. LIMIT ROTATION

32. LIMIT ROTATION Determine from Upper limit rotation
A minimum value is determine among the upper limits rotation, i.e. protection controls.
Lower limit rotation
A maximum value is determine among the lower limits rotation, i.e. protection controls.

33. HIGH PRESSURE PROTECTION
The compressor frequency is adjusted based on indoor coil temperature in heating mode & outdoot coil temperature in cooling mode.
Activation only after 2 second from the start of unit operation.
65C
Reset zone
Drop zone
52C
55C
Up zone
50C
Stop zone
Keep zone
45C

34. DISCHARGE PIPE TEMPERATURE CONTROL
Stop zone
110C
105C
Drop zone
101C
99C
Keep zone
Up zone
97C
Reset zone
Applicable for 5LCY Series I & 5MSY

35. DISCHARGE PIPE TEMPERATURE CONTROL
If compressor discharge temperature >105°C, this control starts and set the current frequency as upper limit. At the same time, running frequency start to reduce by 1 step and so on, until temperature falls between 105°C)and 101°C – at the keep zone.
This protection will cut in when the compressor discharge temperature > 110°C. The compressor will stop and considered trip.
If the compressor discharge temperature < 97°C, the compressor frequency will be reset based on the OD ambient, set and room temperature.
Applicable for 5LCY Series I & 5MSY

36. OVERALL CURRENT CONTROL
Stop zone
14A
Drop zone L2
Keep zone L3
Reset zone
Mode
Cooling
Heating L2
Normal
6.0A
6.75A
ECONO
2.75A L3
5.25A
2.0A
Applicable for 5LCY Series I & 5MSY

37. OVERALL CURRENT CONTROL
Frequency control in each zone:
Drop zone
Set compressor maximum limit = operation frequency – 2 Hz.
After that, frequency is dropped by 2 Hz/second until it reaches Keep zone.
Keep zone
The current maximum frequency is remained.
Reset zone
Compressor frequency is reset based on T & ambient.
Stop zone
After monitoring for 2.5 second, the compressor will stop if current does not fall below 14A.
Applicable for the whole range

38. THANK YOU
&
Q & A