Various Protections - Fujitsu AO G18LBCA Series Service Instruction

1-21. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENTION 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 control of
the compressor frequency is released.
When the discharge temperature becomes higher than Temperature
and the indoor unit LED starts blinking.
(Table14 : Discharge Temperature Over Rise Prevention Control / Release Temperature)
Temperature
104°C
2. CURRENT RELEASE CONTROL
The compressor frequency is controlled so that the outdoor unit input current does not exceeds
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 15 : Current release operation value / release value )
Model 18
[ Heating ]
OT (Control / Release)
7.0A / 6.5A
17°C
9.0A / 8.5A
12°C
10.5A / 10.0A
5 °C
12.0A / 11.5A
OT : Outdoor Temperature
Model 24
[ Heating ]
OT (Control / Release)
10.5A / 10.0A
17°C
13.0A / 12.5A
12°C
15.0A / 14.5A
5 °C
17.0A / 16.5A
OT : Outdoor Temperature
Temperature Temperature
101°C 110°C
[ Cooling ]
OT (Control / Release)
4.5A / 4.0A
50°C
4.5A / 4.0A
46°C
6.0A / 5.5A
40°C
8.5A / 8.0A
OT : Outdoor Temperature
[ Cooling ]
OT (Control / Release)
7.0A / 6.5A
50°C
7.0A / 6.5A
46°C
9.5A / 9.0A
40°C
12.0A / 11.5A
OT : Outdoor Temperature
01-22
,the compressor is stopped