GE Adora DFE29JG Technical Service Manual

Contents

– 38 –Compressor and fan speeds will vary with cabinettemperatures until the set temperature is obtained.After 6 hours of compressor run time (door openingsnot counted), both the fresh food and freezer willenter a heated defrost cycle.Cooling OperationWhen cooling is required, the main control boardmoves the 3-way valve to either A position(supplying refrigerant to both fresh food and freezerevaporators) or B position (supplying only thefreezer evaporator), depending upon compartmenttemperatures.The compressor and fan(s) are delayed for 3 minutesbefore restarting.The compressor will start at HIGH speed for 1minute, then may change speeds depending uponthe temperature of both the fresh food and freezercompartments.When only the fresh food temperature is satisfied,the 3-way valve will move to the B position (supplyingonly the freezer evaporator) to continue cooling thefreezer. Fresh food cycle defrost will begin.When the freezer and fresh food temperatures aresatisfied, the compressor and fans will turn off. The3-way valve will move to the D position, shuttingoff refrigerant flow to both evaporators to improveefficiency and to reduce refrigerant sounds.After the accumulated compressor run time(including door openings) has been reached, theunit will begin the defrost pre-chill cycle. (1 secondof door-open time = 100 seconds of compressor runtime.)Fresh Food Cycle DefrostFresh food cycle defrost occurs between heatedfresh food defrost cycles to reduce excessive frostaccumulations on the fresh food evaporator.During fresh food cycle defrost, the evaporatorfan runs and there is no refrigerant flow thru theevaporator.Fresh food cycle defrost does not use the fresh fooddefrost heater.Fresh food cycle defrost will occur any time thetemperature in the fresh food compartment has beensatisfied. The fresh food fan will run at LOW speed for10 minutes, then cycle off if fresh food temperaturesare satisfied.The fresh food cycle defrost does not occur when thecompressor cycles off.Defrost Pre-Chill (Single and Variable SpeedCompressor)After accumulating 32 hours of compressor run time(actual compressor run time and door openings), theoperating system will enter freezer pre-chill.Pre-chill will occur whether the last freezer defrostwas normal or abnormal.Pre-chill time will vary from 10 to 60 minutes,depending on door openings and compartmenttemperatures during pre-chill.Any compressor run time prior to the beginning ofpre-chill does not count in the pre-chill time.There is a 6-second delay after the compressorcuts off at the end of pre-chill before energizing thedefrost heaters.The ice box fan will run at HIGH speed whenever icebox cooling is needed during the pre-chill cycle.Pre-chill ends when either the maximum time expires,evaporator pre-chill temperature is met, or freezerpre-chill temperatures is met.Fresh Food Only Heated DefrostFresh food only heated defrost occurs after 32 hoursof compressor run time.A freezer pre-chill will run before the fresh food onlyheated defrost.Providing the previous freezer and/or fresh foodheated defrost cycles were normal, the freezer willdefrost with every third fresh food defrost cycle.Fresh food only heated defrost occurs 32, 64, and96 hours after defrosting both fresh food and freezertogether.(Continued next page)