Fujitsu AB A30LBT Series Service Instruction page 25

3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
1st defrost
Compressor
integrating
operation:
Over 22 minutes
Outdoor
Outdoor
heat exchanger
heat exchanger
temperature:
temperature:
Below - 5°C
Below - 9°C
Heating operation start : Compressor ON
2nd and later defrost
Compressor Compressor
integrating integrating
operation: operation:
Over 62 minutes Over 35 minutes
Outdoor
heat exchanger
temperature:
Below - 6°C
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Outdoor heat exchanger temperature: Over 13°C
Compressor ON time: Maximum 15 minutes
(Not defrosted for 10 minutes)
Defrost start
Outdoor fan : OFF
Compressor speed : 0 rps
EEV : 480pulse
4-way valve : OFF
Compressor speed : 55rps
or
Defrost end
01-20
Integrating defrost
(Constant monitoring)
Compressor
Compressor
OFF count :
integrating
40 times
operation:
Over 240 minutes
Outdoor
heat exchanger
temperature:
Below - 3°C