Control Specification SiBE06112133 Function and Control3.3 Controls at Mode Changing / Start-up3.3.1 Preheating OperationOutline The inverter operation in open phase starts with the conditions of the preheating command fromthe indoor unit, the outdoor temperature, and the discharge pipe temperature.Detail 25/35 ClassOutdoor temperature ≥ 7°C → Control AOutdoor temperature < 7°C → Control BControl A ON conditionDischarge pipe temperature < 10°C OFF conditionDischarge pipe temperature > 12°CRadiation fin temperature ≥ 90°CControl B ON conditionDischarge pipe temperature < 20°C OFF conditionDischarge pipe temperature > 22°CRadiation fin temperature ≥ 90°C 50 ClassOutdoor temperature ≥ 10°C → Control AOutdoor temperature < 10°C → Control BControl A ON conditionDischarge pipe temperature < 6°C OFF conditionDischarge pipe temperature > 8°CRadiation fin temperature ≥ 90°CControl B ON conditionDischarge pipe temperature < 10.5°C OFF conditionDischarge pipe temperature > 12°CRadiation fin temperature ≥ 90°C
