Main Functions SiBE06112119 Function and Control1.5 RADIANT OperationThe RADIANT operation has 2 operation modes. RADIANT 1: RADIANT operation with heating RADIANT 2: RADIANT operation only1.5.1 Indoor Electronic Expansion Valve (Motor Operated Valve) ControlInitializing withPower ONThe indoor electronic expansion valve is initialized when turning on the power.Opening LimitControlOpening limit control limits the opening of the indoor electronic expansion valve in order to keepa specified range during RADIANT operation.StartingOperationControlStarting operation control opens the indoor electronic expansion valve to a certain degree whenstarting RADIANT operation. The indoor electronic expansion valve is kept open for a certainperiod.Target PanelTemperatureControlWhen the starting operation control finishes, the target panel temperature control starts andadjusts the opening of the indoor electronic expansion valve to achieve the target paneltemperature. The panel temperature is categorized into stop, dropping, keep, up, and returnzones.(The target panel temperature is 55°C at maximum but it may be lower depending on thecondition.)Operation StopControl In case operation stops during RADIANT operation (including thermostat off)In case any of the following events occur while the indoor electronic expansion valve is open,the operation stop control makes the indoor electronic expansion valve close completely. Operation ON → OFF RADIANT 1 or RADIANT 2 is canceled. Thermostat off Defrost controlStop zone Operation stops, the radiant panel temperature control is carried out.Dropping zone The opening of indoor electronic expansion valve decreases.Keep zone The opening of indoor electronic expansion valve is kept.Up zone The opening of indoor electronic expansion valve increases.Return zone Starting operation control is carried out.Radiant panel temperature45˚CUp zone / return zone from stopUp zone51˚CStop zone70˚CDropping zone55˚CKeep zone53˚C(R14636)
