Various Protections - Fujitsu AUXG45LRLB 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(30,36) 14rps(45,54), and it continues to decrease the frequency for 10/14rps 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.
(Table16 : Discharge Temperature Over Rise Prevention Control / Release Temperature)
MODEL
30,36LBTA
45,54LBTA
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.
30LBTA
[ Heating ]
T0 (Control / Release)
10.0A / 9.5A
17°C
11.5A / 11.0A
12°C
14.5A / 14.0A
5°C
14.5A / 14.0A
T0 : Outdoor Temperature
45,54LBTA
[Heating]
(Table 17 : Current Release Operation Value / Release Value)
20°C < Ta
=
12°C < Ta < 20°C
=
Ta < 12°C
Ta : Outdoor Temperature
Temperature
Temperature
104°C
[ Cooling ]
T0 (Control / Release)
9.0A / 8.5A
50°C
10.0A / 9.5A
46°C
12.5A / 12.0A
40°C
14.5A / 14.0A
T0 : Outdoor Temperature
Outdoor unit fan speed (UP / LO)
900/880rpm 850/830rpm 780/750rpm 720/700rpm 570/550rpm 500/480rpm 370/350rpm 300/280rpm 220/200rpm
Temperature
101°C 110°C
36LBTA
[ Heating ]
T0 (Control / Release)
10.0A / 9.5A
17°C
11.5A / 11.0A
12°C
16.0A / 15.5A
5°C
18.0A / 17.5A
T0 : Outdoor Temperature
14.5A/14.0A
16.5A/16.0A
19.5A/19.0A
01-24
,the compressor is stopped
[ Cooling ]
T0 (Control / Release)
9.0A / 8.5A
50°C
10.0A / 9.5A
46°C
13.0A / 12.5A
40°C
16.5A / 16.0A
T0 : Outdoor Temperature
(Control / Release)