Component Control During Heating Operation - Midea V6-i Series Service Manual

Table 3-5.2: Component control during heating operation
Component diagram
Inverter compressor A COMP(A)
Inverter compressor B COMP(B)
DC fan motor A
DC fan motor B
Electronic expansion
valve A
Electronic expansion
valve C
Four-way valve
Solenoid valve (oil
balance)
Solenoid valve (fast
defrosting (in cooling)
and unloading (in
heating))
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
8-12HP 14-18HP
label
● ●
FANA
● ●
FANB
EXVA
● ●
EXVC
● ●
ST1
● ●
SV4
● ●
SV5
● ●
SV6
● ●
SV7
●
SV8A
● ●
SV8B
SV9
20-24HP 26-28HP 30-32HP
● ● ●
● ● ●
● ● ●
● ● ●
● ● ●
● ● ●
● ● ●
● ● ●
● ● ●
● ● ●
●
● ●
● ●
● ● ●
V6-i VRF 50/60Hz
Control functions and states
Controlled according to load requirement
Controlled according to outdoor ambient
temperature, outdoor heat exchanger pipe
temperature, discharge pressure and load
requirement
Position (steps) from 0 (fully closed) to 480
or 3000 (fully open), controlled according to
discharge superheat
Position (steps) from 0 (fully closed) to 480
(fully open), controlled
temperature different between plate heat
exchanger inlet and outlet
On
Open regularly
Controlled according to
temperature, discharge pressure, discharge
temperature, compressor
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.
according to
ambient
running
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