V6R VRF 50Hz
30
Midea V
6
R
Series S
er
vice M
anual
4.4
Startup Control for Heating Only/Main Heating Operation
Table 3-4.2: Component control during startup in heating only / main heating mode
Component
Wiring
diagram
label
Before startup
Startup control
STEP1
STEP2
STEP3
ODU
Inverter
compressor A
INV1
0Hz
0Hz
Initial step for 30s, then+8Hz×Nstep /
10s. (Until it reaches Pc_max-Pe_min ≥
0.2MPa)
Adjust according to
the high pressure
and low pressure
etc.
Inverter fan 1
FANA
0 Step
0 step
Start: 0 step, then adjust by the high
pressure and low pressure
PI control
Inverter fan 2
FANB
Four way valve ST1
Maintains previous
position
Determined based on the initial mode of the heat exchanger
Electronic
expansion valve
EEVA
pls
Condenser
2880pls,
Evaporator
0pls
Condenser, 2880pls for 2min, then subcooling control
Evaporator, adjusted according to the difference between
ambient temperature and low-pressure saturation
temperature.
EEVC
0pls
0pls
Compressor operation, 17pls
→
+8pls per 20S based on high
pressure or low pressure etc.
Compressor not operation, 0pls.
Solenoid valve
SV5
OFF
ON
SV8A
OFF
OFF
Compressor operation, ON
Compressor not operation, OFF
SV7
OFF→ON for 1min
ON
ON if Pc≥3.3MPa or Pe
＜
0.18MPa, else OFF.
MS01
Electric ball
valve
EVBA
OFF
Control based on IDUs’ mode
EVBB
OFF
EVBC
OFF
2950pls
Electronic
expansion valve
EEVA
240 pulse
0pls
MS04-12
Solenoid valve
SV(n)A
OFF
Control based on IDUs’ mode
SV(n)B
OFF
SVP
OFF
OFF
Electronic
expansion valve
EEVA
240 pulse
0pls
IDU
Fan
Fan
0 step
Setting speed by owners(Anti-cold wind function is effective)
Electronic
expansion valve
EEV
300pls (500P EEV)
1200pls (2000P
EEV)
500P EEV IDU: Maintain 300pls for 3min
2000P EEV IDU : Maintain 1200pls for 3min
Ending conditions
60S
End if startup time arrives 10 min or the minimum superheat of discharge
temperature≥10°C for 5min or Tc_max > 50°C.
