ICE MACHINES Q-Model Service Manual

Section 6Electrical SystemEnergized Parts ChartsSELF-CONTAINED AIR- AND WATER-COOLED MODELSIce MakingSequence OfOperationSTART-UP 11. Water Purge2. RefrigerationSystemStart-UpFREEZESEQUENCE3. Pre-Chill1. Initial Start-Up or Start-Up After Automatic Shut-OffControl Board RelaysContactor1 2 3 4 5 5A 5BWaterPumpWater FillValveHarvestValve(s)Condenser Fan MotorThe fan motor is wired through a fan cycle pressurecontrol, therefore, it may cycle on and off.Harvest Water PurgeThe circuit board has an adjustable water purge in theharvest cycle. This permits a 15, 30 or 45 second purgecycle.Auto Shut-OffThe ice machine remains off for 3 minutes before it canautomatically restart. The ice machine restarts (steps 1-2) immediately after the delay period, if the bin switch reclosesprior to 3 minutes.Safety TimersThe control board has the following non-adjustablesafety timers:WaterDumpValveContactorCoilCompressorFREEZE SEQUENCECondenserFan MotorLengthOf TimeOn Off On On Off Off Off 45 SecondsOff On On Off On OnOffMay cycle On/Off during first45 sec.-----------Cycles On,then Off 1more timeLocked OutAfter SixMinutesOff Off On On4. Freeze On Off Off On OnHARVESTSEQUENCE5. Water PurgeOn30 sec. Off,15 sec. OnOn On On On6. Harvest Off Off On Off On On7. AUTOMATICSHUT-OFFMay CycleOn/OffMay CycleOn/OffMay CycleOn/OffMay CycleOn/OffMay CycleOn/OffOff Off Off Off Off Off Off5 Seconds30 SecondsUntil 7 sec.water contactwith icethickness probeFactory-set at45 SecondsBin switchactivationUntil bin switchre-closes• The ice machine is locked into the freeze cycle forthe first 6 minutes, not allowing the ice thicknessprobe to initiate a harvest sequence.• The maximum freeze time is 60 minutes, at whichtime the control board automatically initiates aharvest sequence (steps 5-6).HARVEST SEQUENCEThe maximum harvest time is 3-1/2 minutes, at whichtime the control board automatically terminates theharvest sequence. If the bin switch is open, the icemachine will go to automatic shut-off (step 7). If the binswitch is closed, the ice machine will go to the freezesequence (steps 3-4).Part No. 80-1100-3 6-1