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YES
NO
YES
YES
NO
NO
YES
NO
(4) Heating operation (Only for PUHY)
Normal operations
Defrosting operations
Stop
Test run
Heating operation
Defrosting
operation
4-way valve ON
Test run start
Thermostat ON
3-minute
restart pre-
vention
Defrosting finish
Defrosting
finish
4-way valve OFF
Note: 1
Note: 2
YES
1 : (6) 4 or 3 : (6) 2
1. Indoor unit fan very low speed
operations
2. Inverter output 0Hz
3. Indoor unit LEV, oil return LEV,
Subcool bypass LEV fully closed
4. Solenoid valve OFF
5. Outdoor unit fan stop
1. Indoor and outdoor unit fan
control
2. Inverter frequency control
3. Indoor unit LEV, oil return LEV,
Subcool bypass LEV control
4. Solenoid valve control
1. Indoor unit fan stop
2. Inverter defrost frequency control
3. Indoor unit LEV fully opened,
oil return LEV fully closed,
Subcool bypass LEV fully opened
4. Solenoid valve control
5. Outdoor unit fan stop
Note : 1 When outdoor unit starts defrosting, it transmits defrost operations command to indoor unit, and the indoor unit starts
defrosting operations.
Similarly when defrosting operation stops, indoor unit returns to heating operation after receiving defrost end command of
outdoor unit.
Note : 2 Defrosting start condition : After integrated 50 minutes of compressor operations, and –2˚C or less outdoor unit coil
temperature.
Defrosting end condition : After 15 minutes of defrosting operation or the outdoor unit coil temperature having risen to 12˚C
(80TMU), 8˚C (100TMU) or more for 80TMU and 100TMU.
Note: 1
Note: 2
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