Various Protections - Fujitsu ARCG040LSTA Service Instruction

22. 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 20 rps, and it continues to decrease the frequency for 20 rps 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 18 : Discharge temperature over rise prevension control / Release temperature )
AOCG040LBTA
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 19 : Current release operation value / Release value )
[ Heating ]
AOCG040LBTA
OT (Control / Release)
7.0A / 6.5A
17°C
9.0A / 8.5A
12°C
11.0A / 10.5A
5°C
13.0A / 12.5A
OT : Outdoor Temperature
Temperature
Temperature
104°C 101°C
[ Cooling ]
AOCG040LBTA
OT (Control / Release)
4.5A / 4.0A
46°C
6.0A / 5.5A
40°C
9.0A / 8.5A
OT : Outdoor Temperature
01-21
, the compressor is stopped
Temperature
110°C