Ms04-12 Component Control During Normal Operation; Ms01 Component Control During Normal Operation - Midea VRF Series Service Manual

V6R VRF 50/60Hz
Table 3-5.3: MS04-12 component control during normal operation
Component
Electronic expansion valve
A(Subcooling)
Solenoid valve (Cooling)
Solenoid valve (Heating)
Solenoid valve (prevents
fluid accumulation)
Table 3-5.4: SV(n)A and S SV(n)B turn ON or OFF depending on the operation mode of the port
ODU mode
Cooling only
Normal Simultaneous
Cooling / Heating
Heating only
Notes:
1. Oil return and defrosting operation are basically identical with cooling only mode.
2. MS unit will neither respond to mode change when at oil return nor defrosting operation.
3. When multi indoor units connected to one port, it obeys the First priority. This means that if there is an indoor unit operates heating first, the other one in
this port can't operate cooling or Fan.
4. SV(n)A and SV(n)B close immediately after the compressor shut down.
5. There is a delay action to avoid SV(n)A and SV(n)B change at the same time (OFF+ON→ON+OFF e.g).
Table 3-5.5: MS01 component control during normal operation
Component
Electronic expansion valve
A( Subcooling)
Electric ball valve (Low
pressure gas valve)
Electric ball valve (High
pressure gas valve)
Electric ball valve (Liquid
valve)
Solenoid valve (prevents fluid
accumulation)
32
Wiring
Normal Cooling
diagram label
EEVA 0pls
SV(n)A
SV(n)A and SV(n)B turn ON or OFF depending on the operation mode of the port. Refer
SV(n)B to table 3-5.4.
SVP ON
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)
Wiring
Normal Cooling
diagram label
EEVA 0pls
EVBA
EVBB
ON or OFF depending on the operation mode of the port. Refer to table 3-5.6.
EVBC
SVP ON
Normal Heating
Superheat PI control
OFF
Solenoid Valve
SV(n)A
ON
Maintain current state Maintain current state
ON
OFF
ON
Normal Heating
Superheat PI control
OFF
Normal Simultaneous
Cooling / Heating
Superheat PI control
SV(n)B
OFF
OFF
ON
OFF
Normal Simultaneous
Cooling / Heating
Superheat PI control