Control Specification SiBE041213E43 Function and Control3.10 Defrost ControlOutline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoorheat exchanger temperature must be more than a certain value to finish defrosting.Detail Conditions for Starting Defrost The starting conditions are determined with the outdoor temperature and the outdoor heatexchanger temperature. The system is in heating operation. The compressor operates for 6 minutes. More than A minutes of accumulated time pass after the start of the operation, or ending theprevious defrosting.Conditions for Canceling DefrostThe judgment is made with the outdoor heat exchanger temperature. (B°C)+: The same value continues.35 class 42 class 50 classA (minutes) 28 30 44B (°C) 4 ~ 18 4 ~ 15 4 ~ 12C (Hz) 76 48 55D (Hz) 86 70 90E (seconds) 50 60 60F (seconds) 60 120 120G (seconds) 480 530 340H (seconds) 60 30 50J (pulse) 450 450 450K (pulse) 200 350 350 +L (pulse) 300 400 350 +M (pulse) 450 450 450FrequencyCompressorFour way valveFanONOFFONOFFONOFF0 Hz 0 HzC HzD Hz5 sec.K pulseM pulseJ pulseInitial openingPI control5 sec.H sec.(R18152)Electronic expansionvalve openingE sec.F sec.G sec.L pulse
