Instruction Manual

2
• Inawholehousesystem,theDH70shouldbelocatedneartheexistingairhandlingsystemtominimizethe
requiredductworkforconnectingoftheDH70system.Whentheremotecontroloptionisused,thecontrol
(humidistat)unitmustbelocatedinthespacethatistobeconditioned.Thecontrol(humidistat)maybelow
voltage(24volt)andshouldbeconnectedtotheDH70withcodeapproved,lowvoltagethermostatcable.
• When a remote Humidistat is utilized, set the unit mounted humidistat to the “OFF” position.
• WhenlocatingtheDH70inareasofextremeheatorhighhumidity,>120-degrees/90%humidity,additional
externalinsulationmayberequiredtopreventundesiredcondensationontheexterioroftheunit.
Electrical Requirements
• TheDH70areequippedwithanappliancecordwithgroundprongandmaybepluggeddirectlyintoagrounded
3prong,120volt,15amphouseholdtypeconvenienceoutlet.Ifusedinawetareasuchasanindoorpool,
sparoom,oranareapronetoooding(basementorcrawlspace),agroundfaultinterrupterprotectedcircuitis
required.Inallcaseslocalcodesprecedeoverallinstallationandwiringrecommendations.
• Do not remove ground prong. Do not use an adaptor. Do not use an extension cord.
• IfaremotewallmountedHumidistatisutilized,installtheHumidistatcontrolinacentralareaofthestructure
whereitwillsensetherelativehumidityofthestructureaccurately.Donotinstallthecontrolwhereitmaynot
accuratelysensetherelativehumidity:nearHVACsupplyregisters,nearexteriordoors,ornearapoolorspa.Do
notinstallthecontrolinanareanotservedbytheDH70.TheinstallermustsupplythewiringbetweentheDH70
andtheHumidistatcontrol.Besuretosafelyroutethecontrolwiringtopreventdamageduringinstallation.Be
carefulnottocrossthewireswhenconnectingtheDH70andthecontrolordamagetothetransformermayresult.
• When a remote Humidistat is utilized, set the unit mounted humidistat to the “OFF” position.
• ConsulttheelectricalschematicinthismanualorinsidetheaccesspaneloftheDH70beforemakingthecontrol
connections.
Condensate Removal
Condensatedrainsbygravity,viathe¾”PVCdrainoutletlocatedattwolocations,frontsideandbackside.Use
ofbothisnotrequired.Asshippedthereardrainisplugged,andmayberemovedandreplacedintothefrontdrain
outletiftherearoutletisused.Alsoincludedwiththeunitisthecondensatedraintrap,thistrapmustbeusedto
allowtheunittodrainproperlyduringoperationandpreventairfrombeingdrawnfromtheareawheretheunitis
located.Anoptionalcondensatepumpkitmaybeinstalledifaliftisrequiredtodisposeofthecondensate.Ifan
optionalpumpisusedthecondensatetrapisstillnecessaryandmustbeinstalledbetweentheunitandpump.
Whenthecondensatedrainislocatedin,orpassesthrough,anon-conditionedspace,thecondensatepiping
shouldbeinsulatedtopreventthedrainlinesweatingthatmaycausedamage.
Avoid double trapping.Whereexibletubingisused,orthepossibilitiesofsagsoccurringinthedrainlineexist,or
thedrainterminatesinasumpbelowthewaterline,thedrainmustbeventedtoallowproperdraining.Acondensate
drainventmustbeinstalledattheoutletsideofthedraintrap,betweenthetrapandthebalanceofdrainline.
Ducting (SeeDuctingDiagram)
A. Installing Duct
TheDH70isequippedwithan8”roundductcollarinlet,andan8”roundexhaust/supplycollarthatprovidesfor
connectingtothesupplydistributionsystem.Inallcasessoundductdesignpracticesmustbefollowedsuchas
thoseprovidedinACCAmanual“D”,orASHRAE’s“FundamentalsofAirSystemdesign”.