Fujitsu AUXB12GA* H - Electronic Expansion Valve Control

3-4-1 ELECTRONIC EXPANSION VALVE CONTROL
03-13
1. Initialization
2. Operation Control
When starting up
Automatic operatic control
Automatic PI control is performed based on the indoor unit heat exchanger outlet temp and inlet temp.
Room temperature control
The room temperature is controlled so that it reaches to the set-up temperature based on the difference
between the room temperature and the set-up temperature, and the change of indoor unit temperature.
if the room temperature becomes 0.5 C lower than the set-up temperature, EEV is fully closed.
3. Special Control
When the power is turned ON.
When it has passed the limited time since the last initialization.
When indoor unit stopping
Oil recovery operation : Controlled pulse.
Test run operation : Controlled pulse.
Icing protection control : Fully closed.
Pump down operation : Fully open.
Defrost operation : Controlled pulse
Outdoor unit Condition
EEV Condition
Cooling
Heating
Fully closed
Slightly open
(Cooling) Move to the cooling control base pulse in steps.
(Heating) Move to the heating control base pulse in steps.
OFF
Fully closed