SPX FLOW Hankison HPR Series - Field Service Troubleshooting Guide; Common Dryer Problem Diagnosis

6
FIELD SERVICE GUIDE
Problemsmostfrequentlyencounteredwithrefrigerateddry-
ers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decom-
pose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.