Fujitsu AO*12LFBC, Service Instructions Manual

Page: 35 / 83

Defrost Flow Chart
The defrosting shall proceed by the integrating operation time and outdoor heat exchanger
temperature as follows.
(Not defrosted for 10 minutes)
(In case of 1st defrost) (In case of 2nd and later defrost)
Compressor OFF
Outdoor fan motor OFF
30 sec later four - way valve OFF
36 sec later compressor ON
Heating operation start : Compressor ON
Compressor integrating
operation:
Over 20 minutes to
below 60 minutes
Compressor integrating
operation:
Over 60 minutes to
below 240 minutes
Compressor integrating
operation:
Over 240 minutes
Compressor integrating
operation:
Over 35 minutes to
below 240 minutes
Compressor integrating
operation:
Over 240 minutes
Outdoor heat exchanger
temperature:
Below - 9 C
Outdoor heat exchanger
temperature:
Outdoor heat exchanger
temperature:
Outdoor heat exchanger
temperature:
Outdoor heat exchanger
temperature:
Defrost start
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Outdoor heat exchanger temperature:
Over 10 C / 16 C
or
Compressor ON time:
Over 15 minutes
Defrost end
Below - 5 C
Below - 3 C
Below - 6 C Below - 3 C
05-15