Product Manual

6
FIELD SERVICE GUIDE
Problemsmostfrequentlyencounteredwithrefrigerated
dryersarewaterdownstreamofthedryerandexcessive
pressuredrop.Mostcausescanbeidentiedandremedied
byfollowingthisguide.
Closedrefrigerationsystemsarepotentially
dangerous.Workontherefrigerationsystemmustbedone
onlybyacompetentrefrigerationmechanic.Donotrelease
uorocarbonrefrigerantstotheatmosphere.Allrefrigerants
mustberecoveredperEPArequirements.Donotsmoke
whenarefrigerationleakissuspected.Burningmaterials
maydecomposerefrigerants,formingatoxicgasoracids
thatmaycauseseriousinjuryandpropertydamage.Before
dismantlinganypartofthedryerorcompressedairsystem,
completely vent the internal pressure to the atmosphere.
PROBLEM SYMPTOM POSSIBLE CAUSE REMEDY
Water Downstream of
Dryer
Refrigerantcompressornot
running.
Leakinrefrigerationsystem. Contact your local distributor.
Compressor overheated.
Turndryeroff,wait30minutes;turndryeron.
(Motorthermostatself-starting)
Compressor burned out. Contact your local distributor.
Nocondensatedischargingfrom
dryer.
Failureofdrain. Dismantleandcleanstrainer.Repairorreplace
solenoid valve.
Dryerinletairtemperaturetoo
high.
Aftercoolermalfunction. Checkaftercoolerdischargetemperatureand
reducetodryerdesigncondition(120°Fmax)
Excessive Pressure
Drop Across Dryer
Lowoutletpressure. Dryerundersized(mayalsocause
waterdownstreamofdryer)
Checkairowanddryercapacity.Reduceairowor
resizeandreplacedryer.
Dryericingup.(checkatseparator) Contact your local distributor.
Color Indicator Out of
Green Zone
Indicatorinredzone. Inletairtemperaturetoohigh. Reduceaftercoolerdischargetemperaturetodesign
conditions(SeeEngineeringData).
Condenserfouledorclogged. Clean or replace condenser.
Inletairtemperaturetoohigh. Reduceaftercoolerdischargetemperaturetodesign
conditions.(SeeEngineeringData)
Highambienttemperature. Ventilatearea.
Improperadjustmentofexpansion
valve.
Removecapfromtheexpansionvalveandturnthe
screwuntiltheindicatorisinthegreenzone.
Indicatorinbluezone. Improperadjustmentofexpansion
valve.
Adjusttheexpansionvalveuntiltheindicatorisin
thegreenzone.
Lowambienttemperature. Increaseambienttemperaturetodesignconditions.