Function Details ESIE12-0664 Function and Control3.2.25 Oil Recovery OperationWhen the compressor runs at low frequency for a long time, the failure of recovering oil maycause the shortage of oil level. Therefore, the oil recovery operation is performed by increasingthe compressor operation frequency for five minutes. The more the unit operates at low frequency, the higher the frequency of oil recoveryoperation becomes.3.2.26 Defrost OperationWhen in heating mode, a defrost operation will be conducted in order to avoid ice formation onthe outdoor unit heat exchanger.Starting ConditionsDefrost will start when the following conditions have been realized:Defrost conditionsDefrost upper limit ADepending on the defrost start setting (field setting mode of the indoor unit remote controller),frost upper limit time A becomes as shown in the table below.&• Integrated compressor running time is 25 minutes or more since the completion of theprevious defrost operation.OR • Defrost upper limit time A is met.• Outdoor unit heat exchanger temperature is within the defrost request area.When quickdefrost starting isset Factory setting When slow defroststarting is setOutdoor air temperature > -5°C 40 minutes 2 hours 6 hoursOutdoor air temperature -5°C 40 minutes 6 hours 8 hours-20 -15 -1050-3-5-6-10-7-15-20-23-17-10-7-4 -7-5-5-8-13-16-19-21-12-9-6-24-27-28-14-11-8 -8-2-25-301552-1-4-1-1110Outdoor unit heat exchanger temperature (°C)Defrost permitarea Defrost requestWhen slightly quick defrost starting is set (Permit)Outdoor temperature (°C)Factory setting (Permit)When slightly quick defrost starting is set (Request)When slightly slow defrost starting is set (Permit)Factory setting (Request)When slightly slow defrost starting is set (Request)
