Fujitsu R410A Service Instruction

3. Defrost Flow Chart
The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.
(Not defrosted for 10 minutes)
Heating operation start : Compressor ON
Outdoor heat exchanger temperature: Over 55° F(13°C)
or
Compressor ON time: Maximum 15 minutes
Defrost end
Compressor
integrating
operation:
Over 17 minutes
Compressor
integrating
operation:
Over 57 minutes
Tn < 15.8°F(- 9°C)
Tn < 23°F(- 5°C)
Compressor
integrating
operation:
Over 35 minutes
2nd and later defrost
Compressor : OFF
Outdoor fan motor : OFF
30 sec later 4-way valve : OFF
35 sec later compressor : ON
Compressor
integrating
operation:
Over 210 minutes
Integrating defrost
Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF
Defrost start
Tn < 26.6°F(- 3°C)
(and after 30 minutes
in the 26.6°F(- 3°C))
Compressor
integrating
operation:
Over 210 minutes
Tn < 23°F(- 5°C)
Compressor
OFF count :
40 times
(Less than 10 minutes)
1st defrost
(and after 5 minutes
in the 23°F(- 5°C))
(and after 5 minutes
in the 23°F(- 5°C))
Integrating defrost
( OFF count defrost )
01-16
䐟
䐠
䐡
Tn < -77°F(-25°C)
(and after 5 minutes
in the 41°F(5°C))
Tn - Tn10 < -41°F(5°C)
( Tn < -42.8°F(6°C))
=
Tn - Tnb < -35.6°F(2°C)
( Tn < -42.8°F(6°C))
=
=
=
Ta - Tn > 41°F(5°C)
=
=
Tn10 : Temperature of continuous operation at 10 minutes.
Tnb : Back 5 minutes temperature.
Tn : Outdoor heat exchanger temperature.
Ta : Outdoor temperature.
and
=

Fujitsu R410A Specifications

General

Brand	Fujitsu
Model	R410A
Category	Air Conditioner
Language	English