Midea MV6-i280WV2GN1-E - Component Control During Startup in Heating Mode; Startup Control for Heating Operation

V6-i VRF 50/60Hz
37
Part 3
- Control
4.3 Startup Control for Heating Operation
Table 3-4.2: Component control during startup in heating mode
Component
Wiring
diagram
label
8-12HP
14-18HP
20-24HP
26-28HP
30-32HP
Control functions and states
Inverter compressor A
COMP(A)
●
●
●
●
●
Controlled according to load requirement,
operating frequency increased by 1 step /
sec
Inverter compressor B
COMP(B)
●
●
●
DC fan motor A
FANA
●
●
●
●
●
Open once the four-way valve has opened,
controlled according to outdoor ambient
temperature and load requirement
DC fan motor B
FANB
●
●
●
Electronic expansion
valve A
EXVA
●
●
●
●
●
Position (steps) from 0 (fully closed) to 480
or 3000 (fully open), controlled according
to discharge superheat
Electronic expansion
valve C
EXVC
●
●
●
●
●
Position (steps) from 0 (fully closed) to 480
(fully open), controlled according to
temperature different between plate heat
exchanger inlet and outlet
Four-way valve
ST1
●
●
●
●
●
On
Solenoid valve (oil
balance)
SV4
●
●
●
●
●
Closed for 200 secs, open for 600 secs, then
closed
Solenoid valve (fast
defrosting (in cooling)
and unloading (in
heating))
SV5
●
●
●
●
●
Open for 4 mins, then closed
Solenoid valve (EXV
bypass)
SV6
●
●
●
●
●
Off
Solenoid valve (indoor
units bypass)
SV7
●
●
Controlled according to load requirement
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