Howe 2000-RLE - Thermostatic Expansion Valve (TXV)

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18
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StartUp&Operation
ThermostaticExpansionValve(TXV)
AlwaysadjusttheEPRpriortoadjustingthe
TXV.
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Superheatisnotareliablemethodofadjusting
TXVonIceFlaker.TXVmustbeadjustedwhile
visuallyinspectingtheEvaporator’sfreezing
surface.
ToincreasetherefrigerantfeedoftheTXV,
rotatestemcounterclockwise.
Todecreasethe
refrigerantfeedoftheTXV,
rotatestemclockwise.
TXVSensingBulb
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Bulbplacementshouldbeatthe4:30position
ofaclockonthesuctionline.
AdjustingRefrigerationtotheIceFlaker
1. Visuallyinspectthefrostpatternonthe
freezingsurfaceoftheEvaporator.
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IftheTXVisunderfeeding,
thetopof
thefrostpatternwillbeamilkywhite
colorandthebottomwillbeclear,soft,
andnotharvestproperly.
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TXVUnderfeeding
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2. IftheTXVisnotunderfeeding,closethe
TXVby1/4ofaturnandwait5
minutes.
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3. Visuallyinspectthefrostpatternofthe
Evaporator.
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4. Repeatsteps#2and#3until
underfeedingcanbeseenatthevery
bottomoftheEvaporator.
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5. Now,
opentheTXVby1/4ofaturn and 
wait5minutes.
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6. Repeatstep#5untiltheentirefrost
patternoftheEvaporatorbecomes
milkywhiteandharvestscompletely.
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7. ConfirmcorrectEPRsetting.(see p.17)