Fujitsu Airstage V series - Fan Control; Cooling Operation; Heating Operation

04-05
(2) In order to enhance reliability and endurance of system, it is monitoring accumulating time of
each compressor operating in the same refrigerant system.
And when accumulating time of operating is over predetermined time, the compressor is stopped and
the rest of stopped compressor is started.
Thus, operating time of each compressor is averaged(Rotation operation).
After starting the outdoor unit, the fan speed of outdoor unit is decided by outdoor air temperature.
When turning on DipSW2-1(Silent operation mode),
switching conditions of Normal mode and Silent mode are as follows.
Switching conditions of step
High pressure saturation temperature < Target high pressure temperature,
and inverter heatsink temperature 75
(The thermistor is built- in the inverter PCB.)
(High pressure saturation temperature - Target high pressure temperature) > About 10
(It depends on the outdoor air temperature)
Or inverter heatsink temperature 80
4-3 FAN CONTROL
4-3-1 Cooling operation
Step 1
Step 1 Step 2 Step 3 Step 4 Step 5
Step 2
Step 3
Step 4
Step 5
Hi
FAN 1
NORMAL MODE
FAN SPEED
OUTDOOR AIR
TEMPERATURE
(Tout)
SILENT MODE
NORMAL MODE SILENT MODE
Hi
Lo
Lo
stop
Hi
FAN 2
Lo
Lo
stop
stop
Lo
FAN 1
Lo
Lo
Lo
stop
Lo Tout > 25
FAN 2
Lo
Lo
stop
stop
Tout 5
15 < Tout 25
5 < Tout 15
Tout < 29 & HP < 2.96MPa
Tout > 33 or HP > 3.57MPa
Tout : Outdoor air temperature
HP : High pressure
4-3-2 Heating Operation
Heating operation is performed at Hi all the time.