GE GSS20 Series Technical Service Manual

Contents

GE GSS20 Series Technical Service Manual Manual pdf 10 page image

– 8 –Normal Operating Characteristics That AreDifferent from Previous Models• Icemaker auger rotates clockwise.• Evaporator fan running, without compressor orcondenser fan.• Post Dwell (Adaptive Defrost), compressor,and condenser fan on with evaporator fan offafter defrost cycle.• Liner Protection Mode, fan comes on when thedoors are open for 3 minutes.• Evaporator fan and compressor can runcontinuously for 2 hours (Adaptive Defrost).• Different sound levels can be heard when thefan changes speed.• Response time for drastic temperature changeis 2 to 10 minutes. The main control board willonly respond to 8 degrees (Fahrenheit) oftemperature change per minute as determinedby resistance of sensor.Abnormal Operating Characteristics(Incorrect Operation)• Evaporator fan on, compressor off, anddamper shut (except liner protection mode).• Rapid fan speed changes, fan takes at least 1minute to change speeds.• Compressor running without the condenserfan. The compressor and condenser fanshould always run at the same time.Adaptive DefrostAdaptive Defrost can be described as a defrostsystem that adapts to a refrigerator’s surroundingenvironment and household usage.Unlike conventional defrost systems that useelectromechanical timers with a fixed defrost cycletime, Adaptive Defrost utilizes an intelligent,electronic control to determine when the defrostcycle is necessary. In order to accomplish thecorrect defrost cycle time, the main control boardmonitors the following refrigerator operations:• Length of time the refrigerator doors were opensince the last defrost cycle.• Length of time the compressor has run sincethe last defrost cycle.• Amount of time the defrost heaters were on inthe last defrost cycle.Adaptive Defrost is divided into 5 separate cycles.Those operations are:• Cooling Operation• Pre-Chill Operation• Defrost Heater Operation• Dwell Period• Post Dwell(See Pub. #31-9062 for more information onAdaptive Defrost.)Cooling Operation (Adaptive Defrost)During the cooling operation, the main controlboard monitors door opening (fresh food andfreezer doors) and compressor run times. Theboard counts the time the doors are open. Itreduces the length between defrosts by 255seconds (multiplication factor) for each secondthat each door is open. If both doors are open, itreduces it by twice the amount. The multiplicationfactor reduces compressor run time. If the doorsare not opened, the compressor will run up to 60hours between defrosts. If the doors are openedfrequently and/or for long periods of time, thecompressor run time between defrosts will bereduced to as little as 8 hours.Pre-Chill Operation (Adaptive Defrost)09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00FREEZERAIRTEMPERATURESDefrostPre-Chill08:0025˚ / -4˚20˚ / -7˚15˚ / -9˚10˚ / -12˚5˚ / -15˚0˚ / -18˚-5˚ / -21˚-10˚ / -23˚-15˚ / -26˚-20˚ / -29˚F˚ / C˚ PRE-CHILL MODEWhen the main control board determines thatdefrost is necessary, it will force the refrigerator