Howe 3000-RLE - Page 19

StartUp&Operation
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19
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SolenoidValve
TheSolenoidValvecontrolstheflowofliquid
refrigeranttotheEvaporator.
TheSolenoidValveshouldenergize
immediatelyuponstartingtheIceFlaker.
TheSolenoidValveshouldonlyde‐energize
whentheIceFlakerisinOff‐DelayCycle(p.22)
orOverloadCondition(p.23).
SightGlass
TheSightGlassprovidesaquickwaytovisually
checkthattheIceFlakerisbeingprovidedwith
constantliquidrefrigerantandthatthereisno
moistureinthesystem.
ThereshouldneverbebubblesintheSight
Glass.Thisindicatesaflashingorinconsistent
liquidfeed.
Themoistureindicatorin
themiddleofthe
SightGlassshouldalwaysbegreen.
 Green–Dry
 Yellow–Wet
FanCyclingControl
OnDual‐FanCondensingUnits(1000‐RLE&
2000‐RLE),theleadfanisalwaysonwhenthe
CondensingUnitisoperating.TheSecondFan
iscontrolledbyan
ambientswitch,which
shouldbesetat50°F.
OnSingle‐FanCondensingUnits(3000‐RLE),the
fanisalwaysonwhentheCondensingUnitis
operating.
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LowPressureControl
AllHoweCondensingUnitsaresuppliedwitha
separateLowPressureControlforcontinuous
pumpdown.
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Theleftsideof
thecontrolindicatespressure
differentialforCut‐Out(compressoroff)and
therightsideindicatespressureforCut‐In
(compressoron).
R‐404A
Diff./Pres. Cut‐In/LBS.
 18 23
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Thetableaboveshowstheapproximatesetting
fortheLowPressureControl. 