Various Protections - Fujitsu AS* G09LECB Service Instruction

23. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENSION CONTROL
The discharge discharge thermistor will detect discharge gas temperature.
1-1. When the discharge temperature becomes higher than Temperature , the compressor speed
is decreased 20rps, and it continues to decrease the speed for 20rps every 120seconds until
the temperature becomes lower than Temperature .
When the discharge temperature becomes lower than Temperature , the protection control of
the compressor speed is released.
However, if this protection repeats and the instruction speed of the compressor falls below 18rps,
the compressor will be stopped.
1-2. When the discharge temperature becomes higher than Temperature
If the above protection stop repeats 2 times, system will be stopped permanently, and the indoor unit
LED starts error indication.
(Table 20 : Discharge Temperature Over Rise Prevension Control / Release Temperature)
AO* G09/ 12LECAN
2. CURRENT RELEASE CONTROL
The compressor speed is controlled so that the outdoor unit input current does not exceeds
the current limit velue that was set up with the outdoor temperature.
The compressor speed returns to the designated speed of the indoor unit at the time
when the speed becomes lower than the release value.
(Table 21 : Current Release Operation Value / Release Value)
[ Heating ]
AO* G09LECAN
OT (Control / Release)
17°C
12°C
5°C
OT : Outdoor Temperature
[ Cooling ]
AO* G09LECAN
OT (Control / Release)
46°C
42°C
OT : Outdoor Temperature
Temperature
104°C
OT (Control / Release)
6.5A / 6.0A
17°C
8.0A / 7.5A
12°C
8.0A / 7.5A
8.0A / 7.5A
OT : Outdoor Temperature
OT (Control / Release)
3.5A / 3.0A
46°C
4.0A / 3.5A
42°C
5.5A / 5.0A
OT : Outdoor Temperature
Temperature
101°C
AO* G12LECAN
6.5A / 6.0A
8.0A / 7.5A
8.5A / 8.0A
5°C
9.5A / 9.0A
AO* G12LECAN
4.0A / 3.5A
5.0A / 4.5A
6.5A / 6.0A
01-19
, the compressor is stopped.
Temperature
110°C