Fujitsu AOU18RLXFZH - Page 29

3 sec later Compressor : OFF
3 sec later Outdoor fan motor : OFF
28sec later 4WAY valve : OFF
34sec later Compressor : ON
3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
Heating operation start : Compressor ON
Outdoor HEX temp. : Over 53.6°F(12°C) for AOU18RLXFZH
Outdoor HEX temp. : Over 60.8°F(16°C) for AOU24RLXFZH
Compressor ON time : Maximum 15 minutes
Defrost end
Integrating defrost
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Defrost start
Normal defrost
Compressor
integrating
operation:
Over 210 min.
Intermittent operation
Compressor
OFF count :
40 times
(Less than 10min.)
Continuous operation
Outdoor HEX temp.
< 1.4°F (-17°C)
.pmet ria edistuO
)C°01-(F°41 >
Outdoor HEX temp.
< Outside air temp.
-(30.6°F (17°C)) or
Outdoor HEX temp.
< -13°F (-25°C)
Outdoor HEX temp.
< Outside air temp.
-(30.6°F (17°C)) or
Outdoor HEX temp.
< -22°F (-30°C)
When the
compressor is
detceted fI ,deppots
outside air temp.
at 35.6°F(2°C)
Outside air temp.
< 14°F(-10°C)
4°F(-20°C) <
Outside air temp.
> 4°F(-20°C)
01-26
=
=

=
=
=
=
=
or
=
・Tn - Tn10 < - 41°F(5°C)
・Tn - TnA < - 35.6°F(2°C)
However Tn < 42.8°F(- 6°C)
(Outdoor heat exchanger
temp. detected for
every 5 minutes )
Tn : Outdoor heat exchanger temp.
Tn10 : Temperature of continuous operation at 10 minutes.
TnA : Back 5 minutes temperature.