2. Operation Flow Chart
Power supply ON
Initialize electronic expansion valve
Initialize micro-computer
Preheating operation control
Remote controller operation
judgement
Operation mode
judgement
Cooling/Dry
Heating
Emergency
operation
Thermostat ON judgement
Starting control four way
valve changeover
· Compressor step control
· Electronic expansion valve PI control
· Low pressure protection control
· High pressure protection control
· Discharge pipe temperature protection control
· Inverter current protection control
· Low outdoor temperature cooling control
· Overall current protection control
· Simulated operation
Normal control
Oil recovery
operation starting
judgement
Oil recovery
operation
Oil recovery
operation ending
judgement
Remote
control
operation OFF
judgement
Standby
judgement
Abnormal stop
judgement
Thermostat OFF judgement
Room thermostat control
Thermostat OFF by freeze-up
protection
Restart standby
A
B
B
A
Cooling/Dry Emergency
Heating