Fujitsu ARYG72LHTA 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.
1st defrost
Compressor Compressor
integrating integrating
operation: operation:
Over 22 minutes Over 62 minutes
Outdoor Outdoor
heat exchanger heat exchanger
temp.: temp.:
Below - 9°C Below - 5°C
Heating operation start : Compressor ON
2nd and later defrost
Compressor
integrating
operation:
Over 35 minutes
Outdoor
heat exchanger
temp.:
Below - 10°C
Defrost start
Defrost Indicator:
[Operation lamp]
6 sec ON / 2 sec OFF
Compressor : OFF
Outdoor fan motor : OFF
30 sec later 4-way valve : OFF
36 sec later compressor : ON
After compressor operation time passed for
1 minute, when a high-pressure sensor
detected more than 2.09MPaG.
or
Compressor ON time: Maximum 15 minutes
Defrost end
01-16
(Not defrosted for 10 minutes)
Integrating defrost
(Constant monitoring)
Compressor
OFF count :
40 times
Fan defrost
[Outdoor temperature]
-10
Compressor
integrating
operation:
Over 240 minutes
Outdoor
heat exchanger
temp.:
Below - 3°C
5