General Control Scheme Flowchart - Midea V8 Series Service Manual

1 General Control Scheme Flowchart

Sections 2 to 8 on the following pages detail when each of the controls in the flowchart below is activated.
Stop operation
▪ Abnormal shutdown
▪ System stops
▪ A unit stops when the load demanded decreases
Standby control
▪ Crankcase heater control
Startup control
▪ Compressor startup delay control
▪ Startup control for cooling operation
▪ Startup control for heating operation
Normal operation control
▪ Component control during normal operation
▪ Compressor control
▪ Heat exchanger control
▪ Electronic expansion valve control
▪ Outdoor fan control
Protection control
▪ High pressure protection control：
▪ Low pressure protection control：
▪ Discharge temperature protection control：
▪ Over-current protection control：
▪ Ambient temperature out of range protection
control
▪ Inverter module temperature protection control：
NTC，Tr
▪ Wet compression protection control
▪ High Pressure Ratio Protection Control
Thermo on
Legend
Numbers in the top right-hand corners
of boxes indicate the relevant section
of text on the following pages.
2
3
Special control
4
Thermo on
5
Conditions met
for oil return
Conditions met
for defrosting
6
V8/V8i PRO VRF 50Hz
▪ Outdoor unit duty cycling
▪ Oil return operation
▪ Defrosting operation
Other control
▪ Overload control
▪ Snow-blowing control
▪ Low noise mode
▪ Power limitation mode
7
8
39