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All rights reserved. Only training and service purposes.
5.1 Cooling & heating Operations
5.1.1 Cooling Mode
• Operating frequency of compressor depends on  the load condition, like the difference  between the room temp. and
the set temp., frequency restrictions.
• If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30
seconds. ( not emergency conditions)
• Compressor turned off when
  - intake air temperature is in between ±0.5 °C of the setting temp. limit  for three minutes continuously.
  - intake air temperature reaches below 1.0 °C of the temperature of setting temp..
• Compressors three minutes time delay.
- After compressor off, the compressor can restart minimum 3 minutes later.
5. Convenience Functions & Controls 
5.1.2 Heating Mode
• Operating frequency of compressor depend on  the load condition, The difference between the room temp. and set
temp., frequency restrictions.
• If compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30 sec-
onds.
• Condition of compressor turned off
   - When intake air temperature reaches +4 °C above the setting temperature.
• Condition of compressor turned on
   - When intake air temperature reaches +2 °C above the setting temperature.
* Condition of indoor fan turned off
- While in compressor on : indoor pipe temp. < 20 °C
- While in compressor off : indoor pipe temp. < 30 °C
• While in defrost control, between the indoor and outdoor fans are turned off.
• Compressor 2 minutes delay
   - After compressor off, the compressor can restart minimum 2 minutes later.
CST/Duct/CVT type indoor unit matched with 
Universal Outdoor unit 
CST/ Duct/CVT type indoor  unit
matched with Single Outdoor unit/Multi 
Outdoor unit/Multi V Outdoor unit
Thermo ON :  +2 °C above  setting temp.
Thermo OFF : +4 °C above  setting temp.
Thermo ON :  Setting temp.
Thermo OFF :  +3 °C above  setting temp.
NOTE: Some Models are different by temperature of thermo ON/OFF.
Part 2   Functions & Controls