Control Specification SiBE04-82440 Function and Control3.10 Defrost ControlOutline Heat Pump OnlyDefrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoorheat exchanger temperature must be more than its fixed value when finishing.Detail Conditions for Starting DefrostThe starting conditions must be made with the outdoor air temperature and heat exchangertemperature. Under the conditions that the system is in heating operation, 6 minutes after thecompressor is started and more than 28 minutes of accumulated time pass since the start of theoperation or ending the defrosting.Conditions for Cancelling DefrostThe judgment must be made with heat exchanger temperature. (25/35 class: 4°C-22°C,50 class: 4°C-12°C) 25/35 class 50 classFrequencyCompressorFour way valveFanElectronic expansionvalve openingONOFFONOFFONOFF0Hz5sec.350pls 450pls450plsInitial openingPI control5sec.50sec.50sec. 660sec.60sec.(R4014)FrequencyCompressorFour way valveFanElectronic expansionvalve openingONOFFONOFFONOFF0Hz55Hz2YC36 : 90Hz5sec.450pps450pps450pps Initial openingPI control5sec.30sec.60sec. 340 sec.120sec.(R8341)
