Fujitsu AB*30LBAG series Service Instruction page 33

3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time and
outdoor heat exchanger temperature as follows.
Compressor integrating
operation:
45 minutes and over
Outdoor temp. > -1°C
=
Outdoor heat exchanger
temperarure:
Below -8°C
Defrost start
Defrost Indicator:
[Operation lamp]
9 sec ON / 1 sec OFF
Heating operation start : Compressor ON
AB*30/ 36LBAG
Outdoor temp. < -1°C
Outdoor heat exchanger
temperarure:
Below -10°C
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 : 92 Hz)
Outdoor heat exchanger temperature: Over 12°C
Compressor ON time: Over 15 minutes
(Not defrosted for 6 or 10 minutes)
Outdoor temp. > -1°C
=
Outdoor heat exchanger
temperarure:
Below -8°C
Outdoor temp -
Outdoor heat exchanger
temperature:
Above 12 degC
or
Defrost end
05-15
AB*45LBAG
Compressor integrating
operation:
45 minutes and over
Outdoor temp. < -1°C
Outdoor heat exchanger
temperarure:
Below -10°C
Outdoor heat exchanger
temperarure:
Below -20°C
Defrost start
Defrost Indicator:
[Operation lamp]
9 sec ON / 1 sec OFF
Outdoor fan motor : Low
Compressor : 30 Hz
4-way valve OFF
Outdoor fan motor OFF
5 Compressor ON
(Frequency : 92 Hz)