Various Protections - Fujitsu AGU12RLF Service Instruction

24. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENSION CONTROL
The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas temperature.
When the discharge temperature becomes higher than Temperature , the compressor frequency
is decreased 20rps, and it continues to decrease the frequency for 20rps every 120 seconds until
the temperature becomes lower than Temperature .
When the discharge temperature becomes lower than Temperature , the protection control of the
compressor frequency will be released.
When the discharge temperature becomes higher than Temperature
and the indoor unit LED starts blinking.
( Table 23 : Discharge temperature over rise prevension control / Release temperature )
Temperature
219.2°F
(104°C)
2. CURRENT RELEASE CONTROL
The compressor frequency is controlled so that the outdoor unit input current does not exceed
the current limit value that was set up with the outdoor temperature.
The compressor frequency returns to the designated frequency of the indoor unit at the time
when the frequency becomes lower than the release value.
( Table 24 : Current release operation value / Release value )
[ Heating ]
AOU9 / 12RLFF
OT (Control / Release)
7.0A / 6.5A
62.6°F
(17°C)
9.0A / 8.5A
53.6°F
(12°C)
10.0A / 9.5A
41°F
(5°C)
10.0A / 9.5A
OT : Outdoor Temperature
[ Cooling ]
AOU9RLFF
OT (Control / Release)
4.5A / 4.0A
114.8°F
(46°C)
6.0A / 5.5A
104°F
(40°C)
7.0A / 6.5A
OT : Outdoor Temperature
Temperature Temperature
213.8°F 230°F
(101°C) (110°C)
[ Heating ]
AOU15RLFF
OT (Control / Release)
7.0A / 6.5A
62.6°F
(17°C)
9.0A / 8.5A
53.6°F
(12°C)
11.0A / 10.5A
41°F
(5°C)
13.0A / 12.5A
OT : Outdoor Temperature
[ Cooling ]
AOU12RLFF
OT (Control / Release)
4.5A / 4.0A
114.8°F
(46°C)
6.0A / 5.5A
104°F
(40°C)
8.5A / 8.0A
OT : Outdoor Temperature
, the compressor is stopped
[ Cooling ]
AOU15RLFF
OT (Control / Release)
114.8°F
(46°C)
104°F
(40°C)
OT : Outdoor Temperature
01-20
4.5A / 4.0A
6.0A / 5.5A
9.0A / 8.5A