Fujitsu AU*A12LALN Service Instruction page 55

5-21. VARIOUS PROTECTIONS
1. DISCHARGE GAS TEMPERATURE OVER RISE PREVENTION CONTROL
1-1. For AU*A12/ 14/ 18/ 24LALN
The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas
temperature.
When the discharge temperature becomes higher than 104°C, the compressor frequency
is decreased 20 Hz, and it continues to decrease the frequency for 20 Hz every 120 seconds until
the temperature becomes lower than 101°C.
When the discharge temperature becomes lower than 101°C, the control of the compressor
frequency is released.
When the discharge temperature becomes higher than 110°C, the compressor stops
1-2. For AU*A36/ 45LATN
The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas
temperature.
When the discharge temperature becomes higher than 105°C, 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 105°C.
When the discharge temperature becomes lower than 100°C, the control of the compressor
frequency is released.
When the discharge temperature becomes higher than 115°C, the compressor stops
2. CURRENT RELEASE CONTROL
2-1. For AU*A12/ 14/ 18/ 24LALN
The compressor frequency 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 frequency returns to the designated frequency of the indoor unit at the time
when the frequency becomes lower than the release value.
(Table 14 : Current Release Operation Value / Release Value)
[ Heating ]
AU*A12LALN
OT (Control / Release)
17°C
12°C
5°C
OT : Outdoor Temperature
[ Cooling ]
AU*A12LALN
OT (Control / Release)
46°C
40°C
OT : Outdoor Temperature
AU*A14/ 18LALN
OT (Control / Release)
6.5A/ 6.0A
17°C
8.0A/ 7.5A
12°C
8.5A/ 8.0A
5°C
9.5A/ 9.0A
OT : Outdoor Temperature
AU*A14/ 18LALN
OT (Control / Release)
4.5A/ 4.0A
46°C
6.0A/ 5.5A
40°C
7.0A/ 6.5A
OT : Outdoor Temperature
AU*A24LALN
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
AU*A24LALN
OT (Control / Release)
4.5A/ 4.0A
46°C
6.0A/ 5.5A
40°C
8.5A/ 8.0A
OT : Outdoor Temperature
05-21
7.0A/ 6.5A
9.0A/ 8.5A
11.5A/ 11.0A
13.0A/ 12.5A
7.0A/ 6.5A
9.5A/ 9.0A
11.5A/ 11.0A