Control Specification SiBE041029EC35 Function 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. (Heating: ON,Cooling / Dry / Defrost: OFF) In order to eliminate the switching sound as the four way valve coilswitches from ON to OFF when the heating is stopped, the OFF delay switch of the four wayvalve is carried out.Detail OFF delay switch of four way valveThe four way valve coil is energized for 150 seconds after the operation is stopped.A (°C) B (°C) C (°C) D (°C) E (°C)RX50/60G2V1BRX50/60G2V1B971 class 10 6 8 10.5 12RX50/60G3V1BRX60G4V1B –2.5 0 2 10 12
