Capacity Control; Auto Changeover Operation - Fujitsu AU G18LVLB Series Service Instruction

1-2. CAPACITY CONTROL

Compressor frequency decides by capacity of an indoor unit, operation number of an indoor unit,
set temperature, room temperature and outside temperature.

1-3. AUTO CHANGEOVER OPERATION

When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum
mode from among the Heating, Cooling, and Monitoring mode. During operation, the
optimum mode is automatically switched in accordance with temperature changes. The temperature
can be set between 18°C and 30°C in 0.5°C (wireless and 2 wire remote controller) or
1.0°C(standard remote controller) steps.
When operation starts, indoor fan and outdoor fan are operated for around 1 minutes.
1
Room temperature and outdoor temperature are sensed, and the operation mode is selected
in accordance with the table below. <Monitoring mode>
( Table 1 : Operation mode selection table )
Room temperature (TR)
TR> Ts+2°C
Ts+2°C
TR < Ts -2°C
*
If it's Middle zone, operation mode of indoor unit is selected as below.
(1). Same operation mode is selected as outdoor unit.
If outdoor unit is operating in Cooling and Heating mode,
indoor unit will be operated by the same operation mode.
(2). Selected by the outdoor temperature.
If outdoor unit is operating in other than Cooling and Heating mode, indoor unit will be operated
according to the outdoor temperature as below.
( Fig.1 : Outdoor temperature zone selection )
Temperature
25 and over
°C
25 under
°C
2
When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the Cooling or Heating mode was selected at
to Monitoring and the operation mode is selected again.
When the middle zone is selected on the predetermining of the operation mode, the operation mode
3
before the changing to the monitor mode is selected.
Operation mode
*
TR Ts -2°C
Mode
Cooling
Heating
01-02
TR : Room temperature
Ts : Setting temperature
Cooling
Middle zone
Heating
1
above, operation is switched