Various Protections - Fujitsu AU G18LVLB 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 10rps(72/90) and it continues to decrease the frequency for 10rps 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.
(Table13 : Discharge Temperature Over Rise Prevention Control / Release Temperature)
AO*G72LRLA
AO*G90LRLA
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.
Temperature Temperature
105°C 101°C
Temperature
115°C
01-23
,the compressor is stopped