Midea V6 Series - Normal Operation Control

V6 VRF 50Hz
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
14-16HP
18-28HP
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 (fully
open), controlled according to discharge superheat
Electronic expansion valve B
EXVB
●
●
●
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 heating) and
unloading (in cooling))
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