Midea V
6R Series Service Manual
Table 3-5.3: MS04-12 component control during normal operation
Normal Simultaneous
Cooling / Heating
Electronic expansion valve
A(Subcooling)
SV(n)A and SV(n)B turn ON or OFF depending on the operation mode of the port. Refer
to table 3-5.4.
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
Normal Simultaneous
Cooling / Heating
Error or Stop (OFF previously)
Error or Stop (Cooling previously)
Error or stop (Heating previously)
Mode conflict(Set the controller to display E0, default)
Mode conflict(Set the controller not to display E0)
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
Normal Simultaneous
Cooling / Heating
Electronic expansion valve
A( Subcooling)
Electric ball valve (Low
pressure gas valve)
ON or OFF depending on the operation mode of the port. Refer to table 3-5.6.
Electric ball valve (High
pressure gas valve)
Electric ball valve (Liquid
valve)
Solenoid valve (prevents fluid
accumulation)
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