Midea VRF Series User Manual

V6R VRF 50/60Hz
26
Midea V
6R Series Service Manual
1 General Control Scheme Flowchart
Sections 3-2 to 3-8 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 only/main cooling
operation

Startup control for heating only/main heating
operation
4
Thermo on
Normal operation control
 Component control during normal operation
 Compressor control
 Heat exchanger control
 Electronic expansion valve control
 Outdoor fan control
5
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
 Wet compression protection control
 High pressure ratio protection control
6
Other control
 Overload control
 Pump-down control
 Snow-blowing control
 Auto mode and Dual set
points
 Low noise mode
 Power limitation mode
8

Midea VRF Series Specifications

General

Compressor Type	Inverter Scroll Compressor
Type	Variable Refrigerant Flow (VRF)
Refrigerant	R410A
Control	Centralized control, individual control
Indoor Unit Types	Wall mounted, cassette, ducted, floor standing
Energy Efficiency	High energy efficiency with DC inverter technology
Indoor Unit Noise Level	19 dB(A) to 45 dB(A)