I was wondering if someone could explain to me how a defrost cycle works. From what I have been told the unit has a sensor and when the sensor detects that the coils have reached a certain temperature it initiates a timer to start the defrost and this timer can be set at intervals of around 30,60, 90 minutes. What I am wondering is does this timer only initiate the defrost if the compressor has run continueously for this time or does it also does it also calculate time in between runs. Lets say the timer is set at 60 minutes and the unit only runs 15 minutes at a time. Would it initiate a defrost after the unit has run about 4 or 5 cycles at 15 minute intervals?