Instruction Manual

6
Typical System Operation Sequence
Upontherelativehumidityexceedingthehumidistatsetpoint,normallybyapproximately3%,thehumidistatwill
energizethedehumidicationandaircirculationcomponentsoftheDH70(notethetimedelayonsomeelectronic
humidistats).IftheDH70systemisconnectedandinterlockedwithanexistingHeating/Airconditioningsystem,
thissystemscirculationfanwillalsobeenergized.TheDH70willcontinuetooperateuntilthehumiditylevelis
reducedtothesetpointselectedonthehumidistatandthenwillcycleoff.Duringthiscycle,theaircirculated
throughtheDH70systemwillbelteredanddehumidied.Ifanoutsideventilationairducthasbeeninstalled,fresh
airwillbelteredanddehumidiedandintroducedtothespaceduringthiscycle.
Coil Freeze Protection (Auto Defrost)
Maintenance
High Efficiency Air Filter
TheDH70issuppliedwitha2”pleatedhighefciencyairlter.The2”lterisratedMERV11,andismoreefcient
thanstandardairltersandisabletocatchmuchsmallerparticlesthatcanaggravateallergies.Operatingthe
unitwithadirtylterwillreducedehumidiercapacityandefciencyandmaycausethecompressortocycleoff
andonunnecessarily.Undernormaloperatingconditions,thelterwilllastapproximately6months.However,in
highparticulateconcentrationsmorefrequentreplacementsmayberequired.Itisrecommendedthatthelterbe
inspectedregularlyfortherstthreetofourmonthstodeterminetheloadingandcorrectreplacementintervals.
Yourinstallationcontractorshouldbecontactedforassistance.
Toaccesstheairlter,removethelteraccesspanelfromtheFrontorBacksideoftheunit,marked“FilterAccess”.
Theltershouldbereadilyvisibleandcanberemovedbypullingitstraightoutoftheunit.
Replacementlterscanbepurchasedfromyourinstallationcontractorororderedfromthefactoryifalocal
representativeisnotavailable.DO NOToperatetheunitwithoutthelter,orwithalesseffectivelterthanoriginally
supplied.Theheatexchangecoilsinsidetheunitcouldbecomecloggedandrequiredisassemblytoclean.
FAILURE TO MAINTAIN SERVICE AND UTILIZE CLEAN FILTERS WILL VOID WARRANTY.

Oiling & Lubrication
Thefanmotorisfactorylubricatedandsealed,andnofurtheroilingisrequired.Therearenoothercomponents
requiringtheadditionoflubricants.
Optional Fresh Air Ventilation (OSA)
Ifyoursystemincludestheoptionalfreshairsystem,itwillhaveanoutsideairintake.Checkandcleanthescreen
ontheoutdoorfreshairintakeseasonally.Theintakescreenmustremainclearofanydebristhatcouldrestrict
airowintothesystem.Thisintakeshouldneverbelocatedwhereundesirablefumes,gasesorodorsmakebe
takenupbytheintake.Inallcaseslocalcodesprevailastothelocationoffreshairintakes.