Manitowoc FLAKE/CHIPLET QC0700 Service Manual

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

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Manitowoc FLAKE/CHIPLET QC0700 Service Manual Manual pdf 50 page image

Ice Machine Sequence of Operation Section 44-2 Part No. 80-1214-3QF2200PRIOR TO START-UPWhen the toggle switch is placed in the “ice” position thefollowing must occur prior to starting an ice makingcycle.A. The bin level probe must be open (bin levellight off). If the probe is closed, (bin level lighton) when the toggle switch is moved to ICE, thecontrol system waits until the bin level probeopens, (bin level light off) before starting an icemaking sequence. If the bin level probe isremoved/disconnected the ice machine will notstart.B. The water level probe must be closed (waterlevel light on) to start the compressor. If thewater level probe is open, (water level light off)the control system waits until the water levelprobe closes before starting the compressor.INITIAL START-UP1A. FlushImmediately after placing the toggle switch into ICE, thedump valve solenoid, and gearbox are energized. After45 seconds the dump valve de-energizes.1B. Water FillAfter 45 seconds the water float valve solenoid isenergized.2. Freeze CycleWhen water contacts the water level probe thecompressor and condenser fan motor energize(condenser fan motor is wired through a fan cyclingcontrol).The gear motor, liquid line solenoid, condenser fanmotor and water float valve solenoid remain energizedas the ice machine makes ice. The water float valve willopen and close automatically to maintain the properwater level.Remote Condensing Unit2. FreezeWhen the refrigerant pressure is high enough, the low-pressure control closes. Closing the low pressure controlenergizes the contactor coil and the compressor starts.The compressor increases the refrigerant pressure, thefan cycling control closes and the condenser fan motorstarts. The compressor and condenser fan motor remainenergized during the entire Freeze Cycle.AUTOMATIC SHUT-OFF3A. Ice Run OutIce will build up in the bin until it contacts the bin levelprobe. After ice contacts the bin level probe for 30continuous seconds the compressor de-energizes. Toallow excess ice to run out, the gear motor and the waterfloat valve solenoid remain energized for an additional 4minutes, then de-energize.3B. Water DrainTo allow water to drain from the evaporator, the dumpvalve energizes for 90 seconds, then de-energizes.An 8-minute lockout starts when the compressor de-energizes. When the ice drops away from the bin levelprobe the ice machine will begin an initial start-up cycle,provided the “8-minute lockout” has expired.8 Minute LockoutAn 8 minute lockout starts when the compressor de-energizes. The bin level light will flash until the 8-minutelockout expires.After the 8 minute lockout expires the bin level light willde-energize.The 8 minute lockout time can be overridden by movingthe ON/OFF/CLEAN toggle switch from ICE to OFF thenback to ICE.FLUSH SEQUENCE IN THE “ICE” POSITIONAfter the ice machine has run for 100 hours the icemachine will stop making ice and perform a flushsequence. The flush sequence will remove minerals thathave settled in the bottom of the evaporator. The entireflush sequence lasts approximately 11 minutes, afterwhich the ice machine automatically resumes icemaking and the 100 hour counter in the control boardresets to zero.NOTE: Flake ice machines use an auger to remove icefrom the evaporator. Occasional noises (creaks, groans,or pops) are a normal part of the ice making process.Remote Condensing Unit3. Automatic Shut-OffWhen the refrigerant pressure is low enough to open thelow-pressure switch, the contactor coil is de-energizedand the compressor and condenser fan motor stop.