Fujitsu AOYG45LAT8 User Manual page 35

3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
Compressor integrating
operation time :
Over 35 minutes
Outdoor
temperature [Ta]
Ta > -10°C
=
Outdoor Outdoor
heat exchanger heat exchanger
temperature [Tn] temperature [Tn]
Tn < -17°C Tn < Ta - 7°C
=
=
Normal defrost
Outdoor unit operation mode : Heating mode
Compressor continuous
operation time
Over 10 minutes
Outdoor
temperature [Ta]
Ta < -10°C
Outdoor
heat exchanger
temperature [Tn]
Tn < -20°C
=
start
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Outdoor heat exchanger temperature (Outlet): Over 12°C
Compressor ON time: Maximum 15 minutes
Compressor
integrating
operation time
Over 240 minutes
Outdoor
heat exchanger
temperature [Ta]
Below - 3°C
Compressor : 70rps
Outdoor fan motor : OFF
Main EEV : 480Pulse
4-way valve : OFF
Solenoid valve : OFF
Indoor fan : OFF
or
Defrost end
01-34
Compressor continuous
operation time
Less than 10 minutes
Compressor
Outdoor
integrating
temperature [Ta]
operation time
Ta < 2°C
Over 210 minutes
Compressor
stop
Outdoor
Compressor
temperature [Ta]
OFF count
Ta < 2°C
40 times
Integrating defrost
start