Normal Operation Control - Midea V8 Series Service Manual

V8/V8i PRO VRF 50Hz

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
Inverter compressor B[1]
Inverter fan 1
Inverter fan 2[1]
Electronic expansion valve
Four-way valve
Solenoid valve (fast
defrosting (in heating) and
unloading (in cooling))
Solenoid valve
( Microchannel heat
exchanger flow control)
Solenoid valve (indoor units
bypass)
Solenoid valve (inverter
compressor A/B vapor
injection)
Notes:
1. The Inverter compressor B.
The SV6 is only available for 26-32HP.
2.
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
Stopping unit
expansion
valve (EEV)
Thermo OFF unit
44
Wiring
diagram label
COMP(A)
COMP(B)
FANA
FANB
EEVA
EEVC
ST1
SV5
SV6[2]
SV7
SV8A/SV8B[1]
Inverter fan 2 and SV8B are only available for 18-32HP.
Cooling
Remote controller setting
OFF
Remote controller setting
Superheat control
0pls
0pls
Cooling
PI control, High pressure protection, Low pressure
protection, Discharge temperature protection, Inverter
Over-current protection control, Inverter module
temperature protection control, Wet compression
protection control, High Pressure Ratio Protection
Control
PI control
Sub-cooling control
Superheat control
OFF
ON
Subcooling control
ON when the low pressure is too low or the high
pressure is too high
Compressor operation, ON
Compressor not operation, OFF
Heating
Remote controller setting
OFF
Remote controller setting
Subcooling control
56pls / 72pls/ (according setting)
56pls / 72pls/ (according setting)
Heating
PI control
ODU superheat control,
discharge pipe
temperature superheat
control
Superheat control
ON
OFF: Ambient temperature
<12°C and heat exchanger
act as evaporator and DSH
≥20°C
otherwise: ON
OFF