GE Adora DFE29JG Technical Service Manual

Contents

– 39 –Freezer and Fresh Food Heated DefrostFollowing pre-chill, the heated freezer and heatedfresh food defrost cycle is initiated where bothheaters will be on at the same time.The 3-way valve will move to the A position. Thecompressor will turn off. The condenser, freezer, freshfood, and ice box fans will turn off.The freezer defrost heater remains on until the freezerevaporator is 50˚F (defrost termination temperature)or the maximum defrost time of 45 minutes isreached.The fresh food defrost heater remains on until thefresh food evaporator is 45˚F (defrost terminationtemperature) or the maximum defrost time of 45minutes is reached.If either the fresh food or freezer defrost heater’sON time exceeds the normal defrost threshold ofapproximately 20 minutes, the defrost is consideredabnormal. Abnormal defrost forces both the freshfood and freezer into pre-chill after 6 hours ofcompressor run time (door openings not counted).During defrost, if power is interrupted, the refrigeratorwill restart in the dwell state if the freezer evaporatortemperature is above 50˚F (defrost terminationtemperature).After both defrost heaters turn off, the refrigerator willenter the dwell cycle.Dwell CycleAfter both defrost heaters have cycled off, the unitwill enter the dwell cycle.During the dwell cycle, the compressor and fanswill remain off. The 3-way valve will move to theA position (both fresh food and freezer open) andremain there for the entire cycle.Dwell cycle will terminate after 7 minutes.At the end of the dwell cycle, the compressor runtimer for adaptive defrost is reset to 0 hours and therefrigerator enters the post-dwell cycle.If power is interrupted during the dwell cycle and thefreezer temperature is greater than 50˚F (the freezerdefrost termination temperature), the dwell cyclewill start over. Note: Pull down will start if the freezertemperature is over 60°F.Post Dwell CycleUpon completion of the dwell cycle, the unit will enterthe post-dwell cycle.The 3-way valve will move to either the A or Bposition, depending upon whether the fresh foodtemperature is satisfied.The compressor and condenser fan will start, but thefresh food fan, freezer fan, and ice box fan will remainoff.Post-dwell cycle will end when the freezer andfresh food evaporators reach the post dwell exittemperature of -10˚F, or the post-dwell time of 10minutes has expired.Upon exit of post-dwell cycle, the control systemwill now operate all cooling components by its logicand restarts the compressor run timer for adaptivedefrost.Refrigerator Operation SummaryModels operate as follows:• Pull down occurs when the refrigerator ispowered up and freezer is above 60˚F.• Cooling operation is the normal cycling oftemperatures whether the last defrost wasnormal or abnormal.• Fresh food cycle defrost occurs when the 3-wayvalve turns off refrigerant flow to the fresh foodevaporator, but the freezer continues to cool.• Pre-chill occurs before freezer heated defrost.• Fresh food defrosts occur 32, 64, and 96 hoursfrom the previous freezer and fresh food heateddefrost.• Freezer heated defrost occurs every 96 hours ofcompressor run time.• Dwell occurs after every heated defrost cycle.• Post dwell occurs after every dwell cycle.