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INDOOR BASIC FUNCTIONS

INDOOR BASIC FUNCTIONS. 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. COOL MODE. When Tr ≥ Ts - 1.5°C Comp, ID Fan and OD Fan ON. When Tr ≤ Ts - 2°C Comp and OD Fan OFF.

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INDOOR BASIC FUNCTIONS

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  1. INDOOR BASIC FUNCTIONS

  2. 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

  3. COOL MODE When Tr ≥ Ts - 1.5°C Comp, ID Fan and OD Fan ON. When Tr ≤ Ts - 2°C Comp and OD Fan OFF. ID Fan remain ON. Tr = Room Temperature Ts = Set Temperature

  4. COOL MODE When will Compressor Stop? When cooling load is too small, even with lowest operation frequency and the room temperature still falling below compressor cut off point, compressor will stop. Compressor Capacity Lowest Freq Time Tr <= Ts - 2°C Comp will stop

  5. HEAT MODE When Ts > Tr - 1.0°C Comp, ID Fan and OD Fan ON. When Tr ≥ Ts + 1.5°C Comp and OD Fan OFF. ID Fan remain ON at lowest speed if ID coil ≥ 27°C. Tr = Room Temperature Ts = Set Temperature

  6. HEAT MODE When will Compressor Stop? When heating load is too small, even with lowest operation frequency and the room temperature still rising above compressor cut off point, compressor will stop. Compressor Capacity Lowest Freq Time Tr - Ts ≥ 1.5°C Comp will stop

  7. FAN MODE Only High, Medium and Low fan speeds are allowed. When changing cool mode to fan mode, the compressor will stop and OD fan stops based on fan OFF control. Compressor will only ON if the minimum stop time is > 3 minutes and the user change back to cool mode. Fan speed will maintain same as during fan mode.

  8. 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

  9. AUTO MODE – 5MSY Without Priority Room Setting When more than 1 indoor is operating, priority is given to the first unit that was turned on. If units that are turned on later to the same operating mode* as the first unit, all units will operate as normal. Otherwise, they will enter into Standby Mode. With Priority Room Setting Unit operation subjected to priority room operating mode. * - COOL, DRY and FAN mode may be used at the same time - AUTO mode automatically selects COOL mode or HEAT mode based on Tr.  AUTO mode is available when selecting the same operation mode as that of the first room to be turned on.

  10. ID-OD COMMUNICATION Master by outdoor unit. Indoor controller board will transmit signal to outdoor controller board every 0.5s. Outdoor unit will response to indoor once the valid data is received. Indoor Acknowledge Send Signal Outdoor

  11. ID-OD COMMUNICATION If the data communication line between indoor and outdoor disrupted for 15s continuously, compressor will stop, OD fan stop with fan OFF timer. ID LED blinks error. If the communication resumes within 15s, error code is clear and compressor restarts after 3 minutes. If the communication does not resume after 15s, unit unable to restart and the error keep blinking.

  12. OUTDOOR BASIC FUNCTIONS

  13. GENERAL FUNCTIONS

  14. THERMISTORS * Multiply by number of indoor.

  15. THERMISTORS IN 5LCY Series I

  16. THERMISTORS IN 5LCY Series II OD heat exchanger thermistor OD air thermistor Suction pipe thermistor Discharge pipe thermistor

  17. THERMISTORS IN 5MSY Liquid pipe thermistor OD heat exchanger thermistor Discharge pipe thermistor Gas pipe thermistor

  18. FUNCTIONS OF THERMISTOR

  19. 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

  20. AUTO RESTART • Factory pre-set. • Allow unit to automatically resume the same operating mode it was in before a power failure. Note: • Do not use as daily ON/OFF of the unit. • Make sure to turn OFF unit using handset first, before turning OFF power supply to perform maintenance. Applicable for the whole range

  21. 4-WAY VALVE CONTROL • Change over switching is only carried out during operation. • OFF delayed is applied when the coil switches from ON to OFF, i.e. 5LCY Series I - 45 second, 5MSY – 150 second. Applicable for the whole range

  22. DEFROST CYCLE Applicable for the whole range

  23. DEFROST CONTROL • Condition for entering defrost • Compressor minimum run time – 6 minutes OR • Compressor accumulated run time of 45 minutes if OD coil < 3C. • When OD coil < 0C AND OD coil < OD air - 10C. • Condition for terminating defrost • OD coil > 12C or • Total defrost timer of 650 seconds. Applicable for 5LCY Series I

  24. DEFROST CONTROL Outdoor coil, Tb (C) -20 -15 -10 -5 0 5 10 15 Outdoor ambient, Ta (C) -1 -3 -5 -7 Defrost request area -9 -11 Defrost permit area • Condition for entering defrost • Compressor accumulated run time > 25 minutes since the completion of the previous defrost cycle AND • Defrost timer A is met OR outdoor coil temperature is within the defrost request area. Applicable for 5LCY Series II

  25. DEFROST CONTROL • Condition for terminating defrost • Defrost time > 10 seconds when Hp > 24.5 bar or • Defrost time > 60 seconds when Tb > 12C or • Defrost time > 540 seconds when Tb > 10C or • Total defrost time of 600 seconds is met. Applicable for 5LCY Series II

  26. DEFROST CONTROL • Condition for entering defrost • Compressor minimum run time – 6 minutes OR • Compressor accumulated run time > 38 minutes. • Based on OD coil temperature, output frequency & OD air temperature. • Condition for terminating defrost • Minimum run time of 120 seconds, THEN • Determine based on OD ambient, in the range of 4C ≤ OD coil ≤ 12C OR • Total defrost timer of 650 seconds. Applicable for 5MSY

  27. OUTDOOR FAN CONTROL This control is carried out according to: • When compressor stops, fan OFF delay cut in to expedite pressure equalization & to prevent refrigerant from entering in evaporator. • During defrost. • During cooling/heating operation. • In 5MSY, when no. of indoor decreases. Applicable for the whole range

  28. OUTDOOR FAN CONTROL Determine from Compressor target rotation: higher fan speed with higher rotation. Outdoor air temperature. Cool mode: Higher fan speed with higher outdoor air temperature. Heat mode: Higher fan speed with lower outdoor air temperature. When compressor stops, fan OFF delay 30 seconds is carried out Applicable for 5LCY Series I

  29. OUTDOOR FAN CONTROL Control in the function of Actual outdoor air temperature. Condensation pressure. Compression ratio: pressure difference between low & high pressure. Applicable for 5LCY Series II

  30. OUTDOOR FAN CONTROL Applicable for 5LCY Series II

  31. OUTDOOR FAN CONTROL When compressor stops, fan OFF delay 60 seconds is carried out. When no. of heating room decreases, fan OFF delay 30 seconds applied if outdoor ambient > 10C. Applicable for 5MSY

  32. PMV CONTROL • Factory pre-set to be ON. • Only active in auto mode. • Minimize excessive cooling and heating based on the predicted mean values (PMV) index specified in ISO7730  reduces annual power consumption without affecting the overall room comfort. • The set point will be moved 1 or 2 C, depending on the actual ID & OD temp. & actual set point, subject to condition changes. The PMV value is calculated every 5 seconds. Applicable for 5LCY Series II

  33. PREHEATING OPERATION CONTROL Model: 5LCY30ER • Activate after compressor has cut out to avoid refrigerant from dissolving into the compressor oil. • Entering condition: • Compressor stops AND • Power ON for < 6 hours OR > 1 hour after compressor stops, OD ambient temp. is not decreasing & discharge pipe temp. < 70C. • Ending condition: • Thermostat cut in AND • Power ON for > 6 hours OR < 1 hour after compressor stops, ambient temp. is not decreasing & discharge pipe temp. > 75C. Applicable for 5LCY Series II

  34. PREHEATING OPERATION CONTROL Model: 5MSY • Entering condition: • OD ambient < 10.5C AND • Discharge pipe temp. < 10.5C. • Ending condition: • OD ambient > 12C AND • Discharge pipe temp. < 12C Applicable for 5MSY

  35. CRANKCASE HEATER CONTROL Model: 5LCY40-60ER • Activate after compressor has cut out to avoid refrigerant from dissolving into the compressor oil. ON OFF 70 C 75 C Discharge pipe temperature Applicable for 5LCY Series II

  36. INDOOR COIL FREEZE PREVENTION Only available in cooling mode. When the indoor coil temperature < 2°C, the compressor starts to drop the frequency. This protection will cut in when: Indoor coil temperature < 0°C for more than 180s. Compressor will stop, OD fan stop after 30s and indoor fan can only run at lowest fan speed. The unit can only be restarted after 3 minutes. When the indoor coil temperature > 13°C, the compressor frequency will be reset based on the OD ambient, room and set temperature. Applicable for the whole range

  37. ROTATION REGULATINGFUNCTIONS

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

  39. STARTING ROTATION

  40. 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.

  41. STARTING CONTROL Compressor rotation, f Max 55 35 20 Time (min) 1 2 6 Applicable for 5LCY Series I

  42. STARTING CONTROL • Normal starting control time is 2-3 minutes & is limited to maximum of 10 minutes. Hz A Step 1 1 2-3 Time (min) • Terminating when low pressure < 6 bar OR when the maximum starting time of 10 minutes has been reached if low pressure stays > 6 bar. Applicable for 5LCY Series II

  43. STARTING CONTROL Compressor rotation, R R3 R2 R1 Time (seconds) T1 T2 T3 Applicable for 5MSY

  44. COMMAND ROTATION

  45. 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.

  46. COMMAND ROTATION Fuzzy Control • Based on temperature difference, T, current fan speed setting & current indoor operating mode at every 30 seconds interval. Temperature Difference Condition 1 T Condition 2 dT Tt = Troom - Tset dT = Tt – Tt-1 Use to set target for compressor frequency change Compressor frequency is increased or decreased Applicable for 5LCY Series I

  47. COMMAND ROTATION • Compressor frequency is controlled to ensure a constant evaporation temperature in cooling and condensing temperature in heating. • In cooling, target rotation is determined by T& evaporating temperature, Te. • T cool = set temperature – room temperature • Depending on the cooling load, 2C  Target Te  20C • In heating, target rotation is determined by T& condensing temperature, Tc. • T cool = room temperature – set temperature • Depending on the heating load, 42C  Target Tc  54C • Frequency changes at every 20 seconds, maximum at 2 steps/change (6 steps/min) • During abnormal condition, frequency changes at 2 steps but may be at < 20 seconds interval. Applicable for 5LCY Series II

  48. COMMAND ROTATION • The operating frequency will be chosen from a list of fixed frequency settings programmed in the unit’s memory: : Max. frequency in cooling Applicable for 5LCY Series II

  49. COMMAND ROTATION PI CONTROL • Based on P control, I control & S value. • 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, a total value of T (T) is obtained: • If T is small  lower frequency. • If T is large  increase frequency. Applicable for 5MSY

  50. COMMAND ROTATION • S value: • Indoor unit capacity value which is used for frequency command. • Total S value of each room is used to determine the upper and lower frequency limits. Applicable for 5MSY

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