Fujitsu AG * V09LAC Series Service Instruction page 29

Defrost Flow Chart
The defrosting shall proceed by the integrating operation time and outdoor heat exchanger
temperature as follows.
Compressor integrating
Compressor integrating
operation:
operation:
Over 60 minutes to
Over 20 minutes to
below 240 minutes
below 60 minutes
Outdoor heat exchanger
Outdoor heat exchanger
temperature:
temperature:
Below -9°C Below -5°C
Heating operation start : Compressor ON
(In case of 1st defrost)
Compressor integrating
operation:
Over 240 minutes
Outdoor heat exchanger
temperature:
Below -3°C
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Outdoor heat exchanger temperature:
Over 10°C / 16°C
or
Compressor ON time:
Over 15 minutes
(Not defrosted for 10 minutes)
Compressor integrating
operation:
Over 35 minutes to
below 240 minutes
Outdoor heat exchanger
temperature:
Below -6°C
Defrost start
Compressor OFF
Outdoor fan motor OFF
30 sec later four - way valve OFF
36 sec later compressor ON
Defrost end
05-15
(In case of 2nd and later defrost)
Compressor integrating
operation:
Over 240 minutes
Outdoor heat exchanger
temperature:
Below -3°C