Hoshizaki KM-100A [10/65] Sequence of operation

2. SEQUENCE OF OPERATION

Thestepsinthesequenceareasoutlinedbelow.Whenpowerissupplied,a5second

delayoccursatstartup.NotethattheorderoftheLEDsfromtheouteredgeoftheboard

is5,6,8,9,4,7.

[a] ONE MINUTE FILL CYCLE

LED8ison.WVopensandthellperiodbegins.After1minute,theboardchecksfor

aclosedF/S.IfF/Sisclosed,theharvestcyclebegins.Ifnot,WVwillremainenergized

through additional 1 minute cycles until water enters the sump and F/S closes. This

servesasalowwatersafetytoprotectthewaterpump.

[b] INITIAL HARVEST CYCLE

LEDs5,6,and8areon.WVremainsopen,Compenergizes,HGVopens,andharvest

begins.As the evaporator warms, the thermistor located on the suction line checks

fora9°Ctemperature.When9°Cisreached,a3.9kΩsignalturnstheharvestoverto

the adjustable harvest timer which is factory set for normal conditions.The timer has

settingsof60,90,120,and180seconds(S1dipswitch1&2).Whentheharvesttimer

completesitscountdown,theharvestcycleiscompleteandthefreezecyclestarts.The

minimumtotaltimeallowedbytheboardforacompleteharvestcycleis2minutes.WV

isopenduringharvestforamaximumof6minutesorthelengthofharvestminus0,10,

30,or50seconds(adjustablebyS1dipswitch7&8),whicheverisshorter.LED8goes

offwhen WV closes. PM energizes and runs for the last 0, 10, 30, or 50 seconds of

harvestdependingonS1dipswitch7&8setting.LED7comesonwhenPMenergizes.

Attheendofharvest,thecontrolboardchecksthepositionofF/Sandproceedstothe

freezecycleifitisclosedorcallsfora1-minutellifitisopen.

[c] FREEZE CYCLE

LEDs5&7areon.Compcontinuestorun,PMandFMSenergize,HGVclosesandthe

freezecyclestarts.Fortherst5minutesafterthethermistortemperaturereaches2°C,

thecontrolboardwillnotacceptasignalfromF/S.Thisminimumfreezeperiodactsasa

shortcycleprotection.Attheendofthisperiod,F/Sassumescontrol.Astheevaporator

cools,thethermistorlocatedonthesuctionlinechecksthetemperatureandPMstops

(see“III.3.TIMINGCHART”fordetails).Thisistopreventslushing.Asicebuildsonthe

evaporatorthewaterlevelinthesumplowers.ThefreezecontinuesuntilF/Sopensand

terminatesiceproduction.