V6R VRF 50Hz
32
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R
Series S
er
vice M
anual
Table 3-5.3: MS04-12 component control during normal operation
Component
Wiring
diagram label
Normal Cooling
Normal Heating
Normal Simultaneous
Cooling / Heating
Electronic expansion valve
A(Subcooling)
EEVA
0pls
Superheat PI control
Superheat PI control
Solenoid valve (Cooling)
SV(n)A
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 (Heating)
SV(n)B
Solenoid valve (prevents
fluid accumulation)
SVP
ON
OFF
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
IDU State
Solenoid Valve
SV(n)A
SV(n)B
Cooling only
Cooling
ON
OFF
Cooling Thermo OFF
Fan
Error or Stop
Normal Simultaneous
Cooling / Heating
Error or Stop (OFF previously)
Maintain current state Maintain current state
Cooling
ON
OFF
Cooling Thermo OFF
Fan
Error or Stop (Cooling previously)
Heating
OFF
ON
Heating Thermo OFF
Error or stop (Heating previously)
Heating only
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)
ON
OFF
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
Wiring
diagram label
Normal Cooling
Normal Heating
Normal Simultaneous
Cooling / Heating
Electronic expansion valve
A( Subcooling)
EEVA
0pls
Superheat PI control
Superheat PI control
Electric ball valve (Low
pressure gas valve)
EVBA
ON or OFF depending on the operation mode of the port. Refer to table 3-5.6.
Electric ball valve (High
pressure gas valve)
EVBB
Electric ball valve (Liquid
valve)
EVBC
Solenoid valve (prevents fluid
accumulation)
SVP
ON
OFF
