Manitowoc FLAKE/CHIPLET QC0700 Service Manual

Also see for QC0700: Installation, use & care manual Building instructions Service manual Technician's handbook

Contents

Electrical System Section 66-2 Part No. 80-1214-3Energized Parts ChartsQF2200*After the liquid line solenoid valve energizes, the suction pressure will rise above the low-pressure switch cut-in (22 psig) and the compressor andcondenser fan motor energize. The condenser fan motor remains energized during the entire freeze cycle, the head pressure control valve con-trols the discharge pressure.When the toggle switch is placed in the ICE position, the following must occur prior to starting an ice making cycle.A.)The bin level probe must be open (Bin Level light off). If the probe is closed (Bin Level light on) when the toggle switch is moved to ICE, thecontrol system waits until the bin level probe opens (Bin Level light off) before starting an ice making sequence.If the bin level probe is disconnected from the control board, the ice machine will not start and will continuously flash the Bin Level light.The ice machine will remain off until:1.The bin level probe is reconnected to the circuit board2.The toggle switch is moved from ICE to OFF, then back to ICE.B. The water level probe must be closed (Water Level light on) to start the compressor.If the water level probe is open (Water Level light off), the control system waits until the water level probe closes before starting the compressor.8-Minute Lockout - The Bin Level light will flash until the 8-minute lockout expires.After the 8-minute lockout expires, the Bin Level light will de-energize.The 8-minute lockout time can be overridden by moving the ICE/OFF/CLEAN toggle switch from ICE to OFF, then back to ICE.Ice MakingSequenceOfOperationControl Relays SensorsLengthOf Time1 2 3 4 WaterLevelProbeBin LevelProbeTemperatureSensorGearMotorSpeedLiquid LineSolenoidValveDumpValveGearMotorFloatValveCoilSTART-UP1A. WaterFlushOff On On OffNotSensing forWater LevelSensing NoIce ContactNot SensingforTemperatureSensingfor GearMotorSpeed45 Seconds1B. WaterFill Off Off On On Sensing forWater LevelSensing NoIce ContactNot SensingforTemperatureSensingfor GearMotorSpeedUntil WaterContactsWater LevelProbeFREEZESEQUENCE2. FreezeOn Off On On Sensing forWater LevelSensing NoIce ContactSensing for123 °FImmediately.Sensing for30° F after 30min. of IceMakingSensingfor GearMotorSpeedUntil IceContacts BinLevel Probefor 30ContinuousSecondsAUTOMATICSHUT-OFF3A. Ice RunOutOff Off On On Sensing forWater LevelSensingIce ContactNot SensingforTemperatureSensingfor GearMotorSpeed4 Minutes3B. DrainEvaporator Off On Off OffNotSensing forWater LevelSensingIce ContactNot SensingforTemperatureNotSensingfor GearMotorSpeed90 SecondsAUTOMATICSHUT-OFF Off Off Off OffNotSensing forWater LevelSensingIce ContactNot SensingforTemperatureNotSensingfor GearMotorSpeedUntil Ice NoLongerContacts BinLevel ProbeRevised 8/2003