Control Specification SiBE041134EB40 Functions and Control3.3 Controls at Mode Changing / Start-up3.3.1 Preheating ControlOutline The inverter operation in open phase starts with the conditions of the outdoor temperature, thedischarge pipe temperature, the radiation fin temperature, and the preheating command fromthe indoor unit.Detail Outdoor temperature ≥ A°C → Control IOutdoor temperature < A°C → Control IIControl I ON conditionDischarge pipe temperature < B°CRadiation fin temperature < 85°C OFF conditionDischarge pipe temperature > C°CRadiation fin temperature ≥ 90°CControl II ON conditionDischarge pipe temperature < D°CRadiation fin temperature < 85°C OFF conditionDischarge pipe temperature > E°CRadiation fin temperature ≥ 90°C3.3.2 Four Way Valve SwitchingOutline The four way valve coil is energized / not energized depending on the operation mode.(Heating: ON, Cooling / Dry / Defrost: OFF) In order to eliminate the switching sound as the fourway valve coil switches from ON to OFF when the heating is stopped, the OFF delay switch ofthe four way valve is carried out.Detail OFF delay switch of four way valveThe four way valve coil is energized for 160 seconds after the operation is stopped.A (°C) B (°C) C (°C) D (°C) E (°C)RXS20/25K2V1B –2.5 10 12 10 12RXS20/25K3V1BRXS20/25L2V1BRXS20/25L3V1BARXS25L2V1BARXS25L3V1B–2.5 0 2 10 12
