Various Protections - Fujitsu AU*24LUAR Service Instruction

5-20. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVER RISE 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 10 Hz, and it continues to decrease the frequency for 10 Hz 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
When the discharge temperature becomes lower than Temperature
(Table 11 : Discharge Temperature Over Rise Prevention Control / Release Temperature)
AU*24LUAR
AU*30LUAS
AU*36LUAS
AU*45LUAS
AU*54LUAS
2. CURRENT RELEASE CONTROL
2-1. For AR*24LUAR
The compressor frequency is controlled so that the outdoor unit input current does not exceeds
the current limit value.
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 12-1 : Current Release Operation Value / Release Value)
AU*24LUAR
Temperature Temperature
110°C
Current Release
Release Value
Operation Value
12.0A
Temperature
105°C 120°C
11.5A
05-19
,the compressor stops.
,the compressor operates.
Temperature
80°C