HANKISON HPET Series - Troubleshooting Guide; Water downstream of dryer; High pressure drop across dryer; High Temperature Alarm

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SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION
A) Water downstream of dryer 1. Residualfreemoistureremainingin
downstream pipelines.
2. Air bypass system is open.
3. Inlet and Outlet connections are reversed.
4. Temperatures surrounding air lines
downstreamofdryerhavedroppedbelow
dryers dew point rating.
5. Excessivefreemoisture(bulkliquid)atdryer
inlet.
6. Condensate not being automatically drained
Drain mechanism is clogged or inoperative.
 Drainlineisrestrictedorfrozen.
 Electricdrains-timernotsettoallowfor
sufcientcondensateremoval.
7. Dryer overloaded resulting in elevated dew
point.
8. Refrigerationsystemnotfunctioningproperly
resulting in elevated dew point.
9. Separator element not properly installed.
Blow out system with dry air.
Checkvalvepositions.
Checkforcorrectconnection.
Insulateorheattraceairlinesexposedtolow
ambients or dry air to lower dew point.
Installseparatoraheadofdryer.
Replacedrainmechanismifinoperative.
Open drain line.
Electric drains-reset time so that all liquid is
discharged.
Checkinletairtemperatureandpressure,ow
rate(compressorcapacity)andambientairor
water temperature.
See D below.
Checkelementinstallation.
B) High pressure drop across
dryer
1. Excessiveairow
2. Freezingofmoistureinevaporatorbecauseof
refrigerationsystemimproperlyfunctioning.
3. Inlet air strainer clogged.
4. Separatorlterelementclogged
Checkowrate.
See D below.
Clean inlet air strainer.
Replacelterelement.
C) High Temperature Alarm 1. Dryer overloaded resulting in high air outlet
temperature.
2. Refrigerationsystemnotfunctioningproperly
resulting in high air outlet temperature.
3. Unitfunctioningnormallybuttemperature
sensorismalfunctioningornotsecurely
mounted.
See A7.
See D below.
Contactqualiedrefrigerationrepairmanor
manufacturer’sservicedepartment.Checkpower
to unit.
D) Refrigeration system not
functioning properly
1. Poweronlightoff
2. Compressoronlightoff
3. Refrigerationcompressor
cyclesonandoff
a. Powerfailure
b. Line disconnect switch open
c. Blownfuses,openbreaker
d. Faulty wiring, loose terminals
a. ON/OFFswitchis“OFF”
b. Line disconnect switch open
c. Blownfuses,openbreaker
d. Faulty wiring, loose terminals
a. High or low ambient conditions
b. Air-cooled-Dirty,cloggedcondenserns,
obstructedowacrosscondenser,faultyfan
motororfancontrolswitch.
Checkforpowertounit
Close disconnect switch
Checkforcontinuity
Haveelectriciancheckelectricalconnections.
Turnswitch“ON”
Close disconnect switch
Checkforcontinuity
Haveelectriciancheckelectricalconnections
Checkmin./max.temperatureranges
Cleancondenserandcheckforfreeairow,if
problempersistscontactqualiedrefrigeration
repairmanormanufacturer’sservicedepartment.
TROUBLESHOOTING GUIDE