Fujitsu AU*24LUAR Service Instruction page 41

3. Defrost Flow Chart
3-1. For AU*24LUAR
The defrosting shall proceed by the integrating operation time as follows.
Heating operation start : Compressor ON
Compressor integrating operation: 40 minutes and over
Outdoor heat exchanger temperarure: Below -8°C
Outdoor heat exchanger temperature: Over 10°C
Compressor ON time: Over 15 minutes
(Not defrosted for 6 or 10 minutes)
Defrost start
Defrost Indicator:
[Operation lamp]
9 sec ON / 1 sec OFF
3 sec later Compressor OFF
3 sec later Outdoor fan motor OFF
28 sec later 4-way valve OFF
34 sec later compressor ON
(Frequency : 95 Hz)
or
Defrost end
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