Fujitsu AS G09LMCB Series Service Instruction page 20

3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
Normal defrost
Operating time more than 25(35)* min.
-20 Tout < -10°C
Tout -10°C
Thex - 17°C Thex Tout -7°C
or
Thex - 20°C
* Model 14: 25min. Model 09/12: 35min.
Tout: Outside temperature
Thex: Outdoor unit heat exchanger temperature
Heating operation start : Compressor ON
Intermittent operation
Tout < -20°C
Compressor
Thex Tout -7°C
OFF count :
or
40 times
Thex - 30°C
(Less than 10min.)
Defrost start
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Thex > 16°C
or
Compressor ON time: Maximum 15 minutes
Defrost end
01-14
(Not defrosted for 10 minutes)
Integrating defrost
Continuous operation
Compressor
integrating
operation:
Over 240 min.
Thex - 3°C
Outdoor fan : OFF
Compressor speed : 0 rps
4-way valve : OFF
Compressor speed : 90rps
Compressor
Compressor
integrating
integrating
operation:
operation:
Over 210 min. &
Over 213 min.
Stopped
Thex - 2°C
Thex - 5°C
(*14LMBC : 70rps)