Howe 2000-RLE - Control Module (CM)

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22
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StartUp&Operation
LevelControlRelay(LC1)
ThisrelayprocessesthesignalfromthePhoto
Eyes.ItshutstheIceFlakeroffwhentheIceBin
isfulltopreventdamagecausedbyicebacking
upintotheevaporatorsection.
MotorRelay(R1)
ThisrelayprovidespowertotheDriveMotor,
theWaterPump,
andtheSolenoidValve.It
featuresamanualoverridebutton,whichwhen
depressedwillengagetherelaycontacts,even
whentherelaycoilisnotenergized.
Transformer(T1)
Thisprovides24voltcontrolpowertothe
ControlModule,MotorRelay,andindicating
lights.
IceFlakerRunIndicatorLight
Thisis
litgreenduringNormalOperation.
MotorOverloadIndicatorLight
ThisislitamberwhenIceFlakerisinOverload
Condition.TheResetButtonislocatedonthe
rearoftheIceflaker.Itisanormallyopen
switch,whichresetsthecircuitafteran
OverloadCondition.
ControlModule(CM) 
Thecontrol
Modulefeatureseightwire
terminals,twoadjustabledials,andone
indicatinglight.
Itoperatesinoneofthreemainmodes:
 NormalOperation
 Off‐DelayCycle
 OverloadCondition
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NormalOperation
NormalOperationbeginswhentheControl
ModulesensesvoltageattheControlSignal
(Term3).
DuringNormalOperation
voltageispresentat
IceFlakerRunSwitchLeg(Term6)andthe
SolenoidValveContacts(Term7&8)are
closed.
Off‐DelayCycle
TheOff‐DelayCyclebeginswhenvoltageis
removedfromtheControlSignal(Term3).
ThelengthoftheOff‐DelayCycleisdetermined
by
theblueOff‐DelaySettingdial.The
incrementsareinminuteswith1beingthe
lowestpossiblesettingand30beingthe
highest.
DuringtheOff‐DelayCyclevoltageispresentat
IceFlakerRunSwitchLeg(Term6)untilthe
timesettinghasbeenmet.TheSolenoidValve
Contacts(Term
7&8)areopenedwhenthe
Off‐DelayCycleisinitiated.
Off‐DelaySetting
UnderNormalOperationtheOff‐DelaySetting
shouldbeadjustedtorunapproximatel y2
minutesaftertheSolenoidValveshutsoffthe
refrigerationtotheIceFlaker.
Forproperadjustment,turnknob
counterclockwiseuntilit
stops.Thenturn
clockwise1/8turnandstop.
The30minutesettingisusedforCleaning
Procedureonly.
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