Normal Operation Control; Outdoor Unit Component Control During Normal Operation; Indoor Unit Component Control During Normal Operation - Midea VRF Series Service Manual

5 Normal Operation Control

5.1 Component Control During Normal Operation
Table 3-5.1: Outdoor unit component control during normal operation
Component
Inverter compressor A
DC fan motor A
DC fan motor B *1
Electronic expansion valve A
Electronic expansion valve C
Four-way valve
Solenoid valve (fast
defrosting (in heating) and
unloading (in cooling))
Solenoid valve (indoor units
bypass)
Solenoid valve (inverter
compressor A vapor
injection)
Table 3-5.2: Indoor unit component control during normal operation
Component
Thermo ON unit
Fan Stopping unit
Thermo OFF unit
Thermo ON unit
Electronic
expansion
Stopping unit
valve (EEV)
Thermo OFF unit
Wiring
Normal Cooling
diagram label
PI control, High pressure protection, Low pressure protection, Discharge temperature
protection, Inverter Over-current protection control, Inverter module temperature
COMP(A)
protection control, Wet compression protection control, High pressure ratio protection
control
FANA
PI control
FANB
Subcooling control,
Inverter module
EEVA
temperature control
Superheat control
EEVC
Outdoor unit heat exchanger: Condenser / OFF
ST1
Outdoor unit heat exchanger: Evaporator / ON
ON with the following conditions:
Ambient temperature ≥5°C when heat exchanger act as evaporator or
SV5
when ambient temperature < 25°C when state of heat exchanger act as condenser
SV7 ON when the low pressure is too low or the high pressure is too high
Compressor operation, ON
SV8A
Compressor not operation, OFF
Normal cooling
Remote controller setting
OFF
Remote controller setting
Outlet temperature average control
500P EEV IDU: 56pls
3000P EEV IDU: 72pls
500P EEV IDU: 56pls
3000P EEV IDU: 72pls
V6R VRF 50/60Hz
Normal Heating
PI control
Subcooling control,
Superheat control, Inverter
module temperature control
Superheat control
Normal heating
Remote controller setting
OFF
Remote controller setting
Condensing temperature average control
500P EEV IDU: 56pls
3000P EEV IDU: 72pls
500P EEV IDU: 56pls
3000P EEV IDU: 72pls
Normal Simultaneous
Cooling / Heating
PI control
Subcooling control,
Superheat control,
Inverter module
temperature control
Superheat control
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