Function Details Si-71A
72 Explanation of Function Operation
5.2.19 Defrosting
Defrost Starting
Conditions
„
Intelligent type
Defrosting starts when either condition 1 or 2 has been realized.
‹
Condition 1
„
The compressor has been running for a total of 25 minutes or more since the start of heating or since
completion of previous defrosting.
„
The compressor has been running continuously for 5 minutes or more.
„
There is an overload but the outdoor unit fan is not OFF.
„
Heating integral capacity is constant or diminishes.(Notes 1 and 2)
„
When outdoor air temperature
≥
5°C: Outdoor unit heat exchange temperature < -3°C
‹
Condition 2
„
The compressor has been running for a total of 3 hours or more since the start of heating or since
completion of previous defrosting. (Note 3)
„
The compressor has been running continuously for 20 seconds or more.
„
There is an overload but the outdoor unit fan is not OFF.
„
Heating integral capacity is constant or diminishes.
„
When outdoor air temperature
≥
5°C: Outdoor unit heat exchange temperature <-3°C
Note:
1. Heating total capacity
Integral capacity is calculated by first totaled according to indoor unit data when heating, and then
dividing it by the compressor running time.
2. At the time of changeover switching, defrosting start becomes 4°C higher.
3. Changeover switching time is 1 hour.
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