Various Protections - Fujitsu AB*A30LBT Service Instruction

5-21. VARIOUS PROTECTIONS

1. DISCHARGE GAS TEMPERATURE OVER RISE PREVENTION CONTROL
1-1. For AO*A 30/ 36LBTL
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
2. CURRENT RELEASE CONTROL
2-1. For AO*A 30/ 36LBTL
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 13 : Current Release Operation Value / Release Value)
[ Heating ]
[ Cooling ]
AO*A30LBTL
OT (Control / Release)
10.0A/ 9.5A
17°C
11.5A/ 11.0A
12°C
15.0A/ 14.5A
5°C
15.0A/ 14.5A
OT : Outdoor Temperature
AO*A30LBTL
OT (Control / Release)
9.0A/8.5A
50°C
10.0A/ 9.5A
46°C
13.0A/12.5A
40°C
15.0A/ 14.5A
12°C
14.5A/14.0A
2°C
13.0A/12.5A
OT : Outdoor Temperature
AO*A36LBTL
OT (Control / Release)
10.0A/ 9.5A
17°C
11.5A/ 11.0A
12°C
15.0A/ 14.5A
5°C
18.0A/ 17.5A
OT : Outdoor Temperature
AO*A36LBTL
OT (Control / Release)
9.0A/8.5A
50°C
10.0A/ 9.5A
46°C
13.0A/ 12.5A
40°C
18.0A/ 17.5A
12°C
14.5A/14.0A
2°C
13.0A/12.5A
OT : Outdoor Temperature
05-19