Midea V6 Series Service Manual page 40

Table 3-5.2: Component control during heating operation
Component
Inverter compressor A
Inverter compressor B
DC fan motor A
DC fan motor B
Electronic expansion valve
A
Electronic expansion valve
B
Electronic expansion valve
C
Four-way valve
Solenoid valve (oil balance)
Solenoid valve (fast
defrosting (in heating) and
unloading (in cooling))
Solenoid valve (EXV
bypass)
Solenoid valve (indoor
units bypass)
Solenoid valve (inverter
compressor A vapor
injection)
Solenoid valve (inverter
compressor B vapor
injection)
Solenoid valve (inverter
compressor B pressure
balance)
Wiring
diagram 8-12HP 14-16HP
label
COMP(A)
● ●
COMP(B)
FANA
● ●
FANB
EXVA
● ●
EXVB
●
EXVC
● ●
ST1
● ●
SV4
● ●
SV5
● ●
SV6
● ●
SV7
●
SV8A
● ●
SV8B
SV9
18-28HP 30-32HP
● ●
Controlled according to load requirement
● ●
Controlled
● ●
temperature,
temperature,
● ●
requirement
● ●
Position (steps) from 0 (fully closed) to 480 (fully
open), controlled according to discharge superheat
● ●
Position (steps) from 0 (fully closed) to 480 (fully
open),
● ●
different between plate heat exchanger inlet and
outlet
On
● ●
Open regularly
● ●
Controlled according to ambient temperature,
discharge
● ●
compressor running frequency and discharge
superheat
Off
● ●
Controlled according to load requirement
●
Controlled according to inverter compressor A
● ●
on/off
Controlled according to inverter compressor B
● ●
on/off
Open before compressor B startup and close after
compressor B running for 15 seconds. Open after
● ●
compressor B stop 10 seconds and keep open 60
seconds.
V6 VRF 50Hz
Control functions and states
according to outdoor
outdoor heat exchanger
discharge pressure
controlled according to
pressure, discharge
ambient
pipe
and load
temperature
temperature,
39