Control Specification SiBE041029EB39 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 have passed since the start of the operation, orending the previous defrosting.Conditions for Canceling DefrostThe judgment is made with the outdoor heat exchanger temperature. (B°C)★: The same value continues.50 class 60 class 71 classA (minutes) 44 44 38B (°C) 4 ~ 12 4 ~ 12 4 ~ 12C (Hz) 55 55 39D (Hz) 90 90 62E (seconds) 60 60 60F (seconds) 120 120 120G (seconds) 340 340 530H (seconds) 30 50 60J (pulse) 450 ★ 450 ★ 450K (pulse) 450 ★ 450 ★ 350L (pulse) 450 ★ 450 ★ 400FrequencyCompressorFour way valveFanONOFFONOFFONOFF0 Hz 0 HzC HzD Hz5 sec.K pulseL pulseJ pulseInitial openingPI control5 sec.H sec.(R19555)Electronic expansionvalve openingE sec.F sec.G sec.
