V4+R VRF 50/60Hz
24
201702
Midea V
4
+R
Se
rie
s Se
rvice
Manua
l
1
General Control Scheme Flowchart
Sections 3-2 to 3-7 on the following pages detail when each of the controls in the flowchart below is activated.
Legend
Numbers in the top right-hand
corners of boxes indicate the
relevant section of text on the
following pages.
Conditions met
for oil return
Conditions met
for defrosting
Thermo on
Special control
Outdoor unit duty cycling
Oil return operation
Defrosting operation
7
Stop operation
Abnormal shutdown
System stops
A unit stops when the load demanded decreases
2
Standby control
Crankcase heater control
3
Startup control
Compressor startup delay control
Startup control for cooling operation
Startup control for heating operation
4
Thermo on
Normal operation control
Component control during normal operation
Compressor output control
Compressor step control
Operation priority and rotation of compressors
Electronic expansion valve control
Outdoor fan control
5
Protection control
High pressure protection control
Low pressure protection control
Discharge temperature protection control
Compressor and inverter module protection
control
Disable heating control
6
Summary of Contents for V4+R Series
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