Fujitsu ASG30LMTA 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
integrating
operation:
Over 22 min.
Outdoor
heat exchanger
temperature:
Below - 9°C
AMP Air Conditioning
Heating operation start : Compressor ON
2nd and later defrost
Compressor
Compressor
integrating integrating
operation:
operation:
Over 35 min.
Over 62 min.
Outdoor Tn-Tn10 < - 5deg
heat exchanger Tn-Tnb < - 2deg
temperature:
However, Tn < - 6 °C
Below - 5°C
Defrost start
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Outdoor heat exchanger temperature:
Over +13°C
Compressor ON time: Maximum 15 minutes
Defrost end
(Not defrosted for 10 minutes)
Compressor
OFF count :
40 times
(Less than 10min.)
=
Compressor OFF
Outdoor fan motor OFF
30 sec later four - way valve OFF
35 sec later compressor ON
or
01-18
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Integrating defrost
(Constant monitoring)
Compressor Compressor
integrating integrating
operation: operation:
Over 240 min. Over 215 min.
Outdoor Outdoor
heat exchanger heat exchanger
temperature: temperature:
Below - 3°C Below - 5°C