Capacity Control; Auto Changeover Operation - Fujitsu ASYA07LBCM Service Manual

1. CAPACITY CONTROL

1-1 COOLING, HEATING, DRY CAPACITY CONTROL
Compressor frequency decides by capacity of an indoor unit, operation number of an indoor unit,
set temperature, room temperature and outside temperature.

2. 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 degC steps.
When operation starts, only the indoor fan is operated for 2 minute. (Air flow mode: Qu)
1
After 2 minute, depends on the room temperature and outdoor air temperature,
the operation mode is selected in accordance with the table below.
( Fig.1 : Outdoor air temperature zone selection )
C zone
32°C
B zone
10°C
A zone
( Table 1 : Operation mode selection table )
Outdoor temperature :To
Room temperature :Tb
Tb > Ts +2 degC
Ts +2 degC > Tb > Ts-2 degC
=
Ts -2 degC > Tb
Ts : Setting temperature
Tb: Room temperature
2 When COOLING was selected at
3 When HEATING was selected at
When the compressor was stopped for 6 consecutive minutes by the temperature control function
4
after the COOLING or HEATING operation mode was selected at
to MONITORING and the operation mode is selected again.
A zone
Monitoring
Monitoring
=
Heating
, the same operation as COOLING OPERATION is performed.
1
, the same operation as HEATING OPERATION is performed.
1
B zone
Cooling
(Automatic Dry)
Monitoring
Heating
above, operation is switched
1
01-01
C zone
Cooling
(Automatic Dry)
Monitoring
Monitoring