Component Control During Startup In Heating Only / Main Heating Mode - Midea VRF Series Service Manual

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