Midea MV6-252WV2GN1 - Page 47

V6 VRF 50/60Hz
46
Midea V6 Series Service Manual
Tables 3-7.1 and 3-7.2 show component control during oil return operation in cooling mode.
Table 3-7.1: Outdoor unit component control during oil return operation in cooling mode
Component
Wiring diagram
label
8-12HP 14-16HP 18-28HP 30-32HP Control functions and states
Inverter compressor A
COMP(A)
● ● ● ●
Fixed frequency
Inverter compressor B
COMP(B)
● ●
DC fan motor A
FANA
● ● ● ●
Fan speed controlled according to
discharge pressure
DC fan motor B
FANB
● ●
Electronic expansion valve A
EXVA
● ● ● ●
Position 480 (steps)
Electronic expansion valve B
EXVB
● ● ●
Electronic expansion valve C
EXVC
● ● ● ●
Position 96 (steps)
Four-way valve
ST1
● ● ● ●
Off
Solenoid valve (oil balance)
SV4
● ● ● ●
Normal control
Solenoid valve (fast defrosting (in
heating) and unloading (in cooling))
SV5 ● ● ● ● On
Solenoid valve (EXV bypass)
SV6
● ● ● ●
On
Solenoid valve (indoor units bypass)
SV7
● ●
Normal control
Solenoid valve (inverter compressor
A vapor injection)
SV8A ● ● ● ●
Controlled
according to inverter
compressor A
Solenoid valve (inverter compressor
B vapor injection)
SV8B ● ●
Controlled
according to inverter
compressor B
Solenoid valve (inverter compressor
B pressure balance)
SV9 ● ● Open before compressor B startup
Table 3-7.2: Indoor unit component control during oil return operation in cooling mode
Component Unit state Control functions and states
Fan
Thermo on Remote controller setting
Standby Off
Thermo off Off
Electronic expansion valve
Thermo on Normal control
Standby 300 (steps)
Thermo off 300 (steps)