FScurtis RNP150 - Page 8

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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licensedrefrigerationmechanic.Donot
releaseuorocarbonrefrigerantstotheatmosphere.Donot
dischargeliquidrefrigerantsintooordrains.Refrigerant
vaporsmayaccumulateinlowplaces.Inhalationofhigh
concentrationsmaybefatal.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.
Lossofpowertodryer Checkpowersupply,fusesand/orbreakers.Check
forlooseconnections.
Dryerturnedoff. CheckOn/Offswitchposition.
Dryeroverloaded. Conrmthatinletow,inlettemperatureandinlet
pressurearewithinacceptablerangeofdryer.
Condenser clogged with debris. Check/cleanambientairlterandcondenser.
Fan motor inoperative Checkfanmotoroperation.Replaceifnecessary.
Ambienttemperaturetoohigh. Verifyambienttemperaturethroughoutday.
Highpressureswitchactivated
(models 200 to 500 only)
Pressmanualresetbuttontoswitchtoresetbutton.
Compressor overheated. Turndryeroff.Contactlocaldistributor.
Compressordefective. Turndryeroff.Contactlocaldistributor.
Nocondensatedischargingfrom
dryer.
Drainstrainerclogged. Clean drain strainer.
Drainvalveinoperative. Check/rebuilddrainvalve.
DraintimerorDSMinoperative. ConrmthereispowertothetimerorDSM.
ReplacetimerorDSM,ifnecessary.
Drainsolenoidinoperative. Conrmthereispowertothecoil.Replacecoil,if
necessary.
Condensatedischargingfromdryer. Incorrectdraintimersetting. Adjustdraintimer-increaseopentimeand/or
decrease closed time.
Liquidwaterenteringdryer. Aftercoolerdrainvalvemalfunction. Check,repairaftercoolerdrainvalve.
Excessive Pressure
Drop Across Dryer
Frozencondensateinevaporator. Incorrecthotgasbypassvalve
setting.
Contact local distributor.
Inletairpressurelow. Upstreamrestrictioninairsystem. Checkallupstreamairsystemcomponents(valves,
regulators,etc.)
Dryerundersized. Excessivecompressedairow. Resizedryer.
Dew Point Indicator
Out of Green Zone
Dryeroverloaded. Conrmthatinletow,inlettemperatureandinlet
pressurearewithinacceptablerangeofdryer.
Condenser clogged with debris. Check/cleanambientairlterandcondenser.
Loosesensorconnection. ConrmgaugeorDSMsensoristightlyconnected
to dryer tubing.
Defectivegauge,DSMorDSM
sensor.
Replacegauge,DSMorDSMsensor.