Compressor Control; Simultaneous Cooling And Heating Operation - Midea VRF Series Service Manual

Table 3-5.6: Electric ball valve turn ON or OFF depending on the operation mode of the port.
ODU mode
Cooling only
Normal Simultaneous
Cooling / Heating
Heating only

5.2 Compressor Control

Cooling operation
Compressor frequency is PI controlled to keep low pressure at target temperature.
Te: Low pressure equivalent saturation temperature (°C)
Tes: Target Te value.
Tes will be decided by Te setting, if you choose Auto that means except Te setting, the Tes would be adjusted according to
the ambient temperature, refrigerant pipe length, etc.
Table 3-5.7: Te setting
Setting 1 (Default)
Tes(C) 6 Auto
Heating operation
Compressor frequency is PI controlled to keep high pressure at target temperature.
Tc: High pressure equivalent saturation temperature (°C)
Tcs: Target Tc value.
Tcs will be decided by Tc setting, if you choose Auto that means except Tc setting, the Tcs would be adjusted according to
the ambient temperature, refrigerant pipe length, etc.
Table 3-5.8: Tc setting
Setting 1 (Default)
Tcs(C) 48 Auto

Simultaneous cooling and heating operation

It controls compressor capacity to adjust Tc to target value (Tcs) and Te to target value (Tes).
IDU state
Cooling
Cooling Thermo OFF
Fan
Error or Stop
Error or Stop (OFF previously)
Cooling
Cooling Thermo OFF
Fan
Error or Stop (Cooling previously)
Heating
Heating Thermo OFF
Error or stop (Heating previously)
Heating
Heating Thermo OFF
Fan
Error or Stop
mode conflict(Set the controller to display E0,
default)
mode conflict(Set the controller not to display
E0)
2 3
0 Auto 3 Auto
2 3
50 Auto 45 Auto
EVBA
2950pls
Maintain
state
2950pls
0pls
2950
4 5
9 Fixed 6 Fixed 3 Fixed
4 5
42 Fixed 44 Fixed 46 Fixed
V6R VRF 50/60Hz
Electric ball valve
EVBB
0pls
current Maintain current
state
0pls
2950pls
0pls
6 7 8
0 Fixed -3 Fixed
6 7 8
48 Fixed 51 Fixed
EVBC
2950pls
Maintain current
state
2950pls
2950pls
2950pls
33