Normal Operation Control - Midea MV6-252WV2GN1 Service Manual

V6 VRF 50/60Hz

5 Normal Operation Control

5.1 Component Control during Normal Operation
Table 3-5.1: Component control during normal cooling 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)
38
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 according to discharge pressure
● ●
Position (steps) from 0 (fully closed) to 480 (fully
● ●
open),
temperature
● ●
Position (steps) from 0 (fully closed) to 480 (fully
open),
● ●
different between plate heat exchanger inlet and
outlet
Off
● ●
Open regularly
● ●
Controlled according to ambient temperature,
discharge
● ●
compressor running frequency and discharge
superheat
Controlled according to discharge pressure and
● ●
discharge temperature
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.
Control functions and states
controlled according to
controlled according to
pressure, discharge
discharge
temperature
temperature,