Use and Care Manual
7
TROUBLESHOOTING GUIDE
A) Water downstream of dryer
B) High pressure drop across
dryer
C) Fault Alarm
D) Refrigeration system not func-
tioning properly
1. Whendryeron/offswitchinonor
"I"position
2. Refrigerantcompressorcycleson
andoff
1. Residualfreemoistureremainingin
downstream pipelines
2. Airby-passsystemisopen
3. InletandOutletconnectionsare
reversed
4. Temperaturessurroundingair
linesdownstreamofdryerhave
dropped below dryers dew point
rating.
5.Excessivefreemoisture(bulkliquid)
at dryer inlet
6.Condensatenotbeingautomati-
cally drained
Drainmechanismiscloggedor
inoperative.
Drainlineisrestrictedorfrozen.
7.Dryeroverloadedresultinginel-
evated dew point.
8. Refrigerationsystemnotfunction-
ing properly resulting in elevated
dew point.
1. Inletairstrainerclogged
2.Excessiveairow
3.Separatorlterclogged.
4.Freezingofmoistureinevaporator
becauseofrefrigerationsystem
improperlyfunctioning.
1.Dryeroverloadedresultinginhigh
air outlet temperature.
2.Refrigerationsystemnotfunction-
ing properly resulting in high air
outlet temperature.
3.Unitfunctioningnormallybutther-
mostaticswitchismalfunctioning
or not securely mounted.
a. Powerfailure
b. Line disconnect switch open
c. Blownfuses,openbreaker
d.Faultywiring,looseterminals
a. Highorlowambientconditions
b.Ambientairlterclogged
c. Condensernsclogged
d.Fanmotororfancontrolswitch
malfunction
e. Refrigerantleak
f. Lowvoltage
Blow out system with dry air
Checkvalvepositions
Checkforcorrectconnection
Insulateorheattraceairlinesexposed
to low ambients or dry air to lower
dew point
Installseparatoraheadofdryer
Replacedrainmechanismifinopera-
tive
Open drain line
Checkinletairtemperatureandpres-
sure,owrate(compressorcapacity)
and ambient air temperature
SeeDbelow
Cleaninletairstrainer
Checkowrate
Replaceltersleeve
SeeDbelow
SeeA7
SeeDbelow
Contactqualiedrefrigerationrepair-
manormanufacturer’sservicedepart-
ment
Checkpowertounit
Closedisconnectswitch
Checkforcontinuity
Haveelectriciancheckelectricalcon-
nections
Checkminimum/maximumtempera-
ture ranges
Cleanambientairlter
Cleancondenser
Replacefanmotororfancontrol
switch
Contactqualiedrefrigerationrepair-
manormanufacturer'sservicedepart-
ment
Checkwiring
SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION