Auto Changeover Operation - Fujitsu AB A30LBT Series Service Instruction

1-4. AUTO CHANGEOVER OPERATION

When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum
mode from among the HEATING, COOLING and MONITORING modes. During operation, the
optimum mode is automatically swiched in accordance with temperature changes. The temperature
can be set between 18°C and 30°C in 1 °C steps.
1 When operation starts, only the indoor fan is operated for 1 minute. (Air flow mode: S- Lo)
After 1 minute, depends on the room temperature and outdoor unit's operarion mode,
the operation mode is selected in accordance with the below.
( Fig.5 : Operation mode selection based on Outdoor Temperature )
Outdoor temperature
( Table 4 : Operation mode selection table )
Outdoor temperature zone
Room temperature :Tb
Tb > Ts +2 °C
Ts +2 °C > Tb > Ts -2 °C
=
=
Ts -2 °C > Tb
Ts : Setting temperature
When COOLING was selected at
2
The same operation as COOLING OPERATION of page 01-01 is performed.
However, the setting temperature is raised 1°C and the room temperature correct coefficient value is 0°C.
When the compressor speed have been below 23Hz for 8 minutes or the room temperature reaches
"setting temperature -1.5°C" , operation is automatically switched to DRY OPERATION of page 01-03
is performed.
However, compressor control based on room temperature is as follows.
Room
temperature
Ts - 1.5°C
If the room temperature reaches "setting temperature +2°C" during DRY operation,
operation returns to COOLING operation.
When HEATING was selected at
3
is performed. However, the room temperature correct coefficient value is 0°C.
4
When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the COOLING or HEATING operation mode was selected at
to MONITORING and the operation mode is selected again.
C zone
32°C
B zone
-10°C
A zone
A zone
Monitoring
Monitoring
Heating
, the air conditioner operates as follow:
1
Compressor :ON
Compressor :OFF
, the same operation as HEATING OPERATION of page 01-02
1
01-04
B zone
Cooling Cooling
(Automatic Dry) (Automatic Dry)
Monitoring
Heating
Ts - 0.5°C
above, operation is switched
1
C zone
Monitoring
Monitoring