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Valve and sensor function and operation
Multi Controller
Multi Controller - valve functions
Symbol Name of valve Description of function
PMV (A, B, C, D) Flow rate control valve This opens to the extent corresponding to the capacity
and performance required of each indoor unit.
SVS (A, B, C, D) Suction gas valve Opens when commands from the indoor units require
cooling operation.
SVD (A, B, C, D) Discharge gas valve Opens when commands from the indoor units require
heating operation.
SVSS Pressure reducing Opens when the number of units in heating operation
solenoid valve is reduced (heating to shutdown or cooling).
Opens when defrost operation starts.
Opens during oil retrieval control in cooling operation.
SVDD Pressure increasing Opens when the number of units in heating operation
solenoid valve is increased (shutdown or cooling to heating).
Opens while control is performed to prevent liquid
in discharge pipe from being blocked.
SVH Superheat solenoid valve Opens when unit in cooling operation is present.
Multi Controller - valve operation
Outdoor operation mode Indoor operation mode SVD SVS PMV
Shutdown Shutdown, fan OFF OFF Fully closed
During operation Shutdown, fan OFF ON Fully closed
Cooling OFF ON Rated opening
Cooling thermo-control (@ setpoint) OFF OFF ON Fully closed
Heating ON OFF Rated opening
Heating thermo-control (@ setpoint) OFF ON OFF Fully closed
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