KitchenAid KUIS18NNJ manual Operational Cycles, ICE Making Cycle, Electrical System, Water System

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OPERATIONAL CYCLES

There are three main operational cycles for the ice maker (more detailed operation is found in the flow chart on page 6-5):

•Ice Making

•Harvest

•Diagnostics/Clean

ICE MAKING CYCLE

In addition, there are two possible “Off” cycles for the ice maker. They occur when:

1.The bin is full of ice and the service control switch is turned “ON” (Idle mode).

2.The service control switch is turned “OFF” while power is still supplied to the unit.

Electrical System

Power is supplied through the service control switches to the primary side of the voltage step-down transformer, (120 VAC reduced to

8.7VAC for the cutter grid and the bin light), and the electronic control board. The elec- tronic control board in turn supplies 120 VAC to the water recirculating pump, water inlet valve, hot gas solenoid, condenser fan motor, and compressor. An evaporator thermistor sup- plies temperature information to the electronic control.

Refrigeration System

The hot gas refrigerant, under high pressure, is forced through the condenser, where it changes into a liquid, and flows through the drier and capillary tube into the evaporator. Under low pressure in the evaporator, the liquid refriger- ant absorbs heat from the water flowing over the evaporator. The refrigerant evaporates into a gas, and passes into the accumulator. As a low pressure gas, the refrigerant flows back through the suction line of the heat exchanger, to the compressor.

During the Ice Making cycle, some of the hot gas that is in the condenser accumulating tube, condenses to a liquid, and remains in the accumulating tube.

During the later stages of the Ice Making cycle, as the ice slab forms on the evaporator freez- ing plate, some of the refrigerant passing through the evaporator will not evaporate into a gas, but will remain a liquid. This liquid refrigerant will settle in the accumulator, while the refrigerant vapor is sucked off through the suction tube at the top of the accumulator. This accumulated liquid refrigerant will eventually be evaporated by the warmed refrigerant gas passing through the accumulator during the Harvest cycle, and during the beginning of the next Ice Making cycle.

NOTE: It is very important that the accumulator is not tilted out of a horizontal position. If moved, it could cause compressor failure.

Water System

The water recirculating pump moves the water from the reservoir pan up to the distributor, where it flows out over the evaporator freezing plate.

Water that does not freeze on the evaporator plate runs off the front edge, and falls back into the reservoir, where it is recirculated back to the water distributor.

As the ice slab forms, the minerals in the water are on the surface of the ice. The water flowing over the top of the ice slab washes these miner- als back into the water reservoir pan. The water continues to recirculate until the ice slab reaches the set thickness. Thickness is determined by the placement of the P4 jumper, located on the control board.

Control board #6100499 with Code Date MGR/ 0245 (45th week, 2002), or higher, will allow ice thickness adjustments (see “Adjusting The Ice Thickness” on page 8-3).

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Contents 18″ Automatic ICE Makers Forward Goals and ObjectivesTable of Contents Wiring Diagram & Strip Circuits General Safety FirstElectrical Power Supply & Grounding Requirements Electrostatic Discharge ESD Sensitive Electronics Model Number Serial NumberYear of Introduction Model & Serial Number Label Location Model & Serial Number LocationSpecifications Kitchenaid ICE Maker Warranty Page Recommended Grounding Method Installation InformationElectrical Supply Requirements Connecting the Water Line Water Supply and Drain ConnectionsConnecting the Drain Gravity Drain SystemDrain Pump System On Some Models Refrigeration System Theory of OperationOperating Systems Water System Electrical System Operational Cycles ICE Making CycleElectrical System Refrigeration SystemDiagnostics / Clean Cycle Harvest CycleNEW ICE Maker Control Board #6100499 Models with Internal Drain Pumps Page Component Access Component LocationsTo remove the bin thermistor To remove the cutter gridTo remove the evaporator thermistor On the nextTo remove the water distributor Removing the Electronic Control Housing Components To remove the electronic control boardTo remove the cutter grid transformer Removing the Water Recirculation Pump Removing the Condenser FAN Motor Disconnect Tubing Internal Drain Pump Nut Marking On Fan Removing the Evaporator Screw Water Trough Remove the Permagum from the liner channel Reassembly Notes Removing the Water Inlet Valve Removing the HOT GAS Valve & Solenoid To remove the hot gas valveRemoving the Condenser Removing the Compressor Pull the two clips off the rear studs of the compressor Removing the Internal Drain Pump Only on Some Models Removing the ICE Maker Door & Gasket To remove the door gasket18″ Models Bottom Door Cap Screws Door Hinge Hinge Pin Channel Support Reassembly Notes Page Component Testing BIN ThermistorCutter Grid Cutter Grid TransformerWater Recirculation Pump Condenser FAN MotorWater Inlet Valve Solenoid HOT GAS Valve SolenoidCOMPRESSOR, Overload PROTECTOR, & Relay To test the compressor windingsTo test the relay Pushbutton Switch Assembly Page Diagnosis & Troubleshooting Water and ITS Effect on Making ICEEffect on ICE Quality Effect on ICE MakerTroubleshooting Chart Problem Probable Cause Test Procedure-ActionWill not make ice Defective bin thermistor Diagnostic Flow Chart for ICE Maker Control Board #6100499 OverviewFlush Mode 5 minutes Idle Mode Page Unit leaves Freeze Mode Warmer Ambients Page Reservoir must be drained prior to restarting the unit Page Wiring Diagram & Strip Circuits Wiring DiagramStrip Circuits ICE Making ModeHarvest Mode First 25 Seconds of DIAGNOSTICS/CLEAN Mode Last 47 Minutes of DIAGNOSTICS/CLEAN ModePage Tech Tips Cleaning the ICE MakerCleaning Evaporator Plate Cleaning Solution On Pad Adjusting the ICE Thickness Thick ThinPage Product Specifications Warranty Information Sources
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KUIS185J, KUIA15NRH, KUIS18NNJ, KUIA18PNL, KUIA15NLH specifications

KitchenAid has long been synonymous with quality in the realm of kitchen appliances, and its line of undercounter ice makers, specifically the models KUIA18NNJ, KUIV18NNM, KUIS18PNJ, KUIA18PNL, and KUIS18NNJ, exemplifies the brand's commitment to innovation and functionality. These ice makers are designed to deliver a reliable supply of ice without taking up valuable space in your kitchen.

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