Owner manual

3
• Connecting to Existing HVAC Systems:Forproperoperation,connectingtoexistingairhandlerandduct
systemsrequiresthefansofeachsystemtobeinterlockedutilizingthelowvoltageinterlockmethodprovided
intheDH95lowvoltageconnectiondiagram.Refertolowvoltageconnectiondiagraminthisdocumentand
ontheunit.
C. Installation in a Basement or Crawl Space with an Existing Forced Air HVAC System
(Whole House Dehumidification)
IfthestructureinwhichtheDH95SystemistobeinstalledhasanexistingforcedairHVACsystem,utilizethe
HVACsystemtomaketheDH95Systeminstallationeasierandprovidebettersystemperformance.
Basement or Crawl Space Installation:Installaseparate10”returnfortheDH95inacentralareaofthe
structureorifthereturnductingisadequatetapintotheexistingreturnductsystemnearthereturnairgrill.Duct
thesupplyoftheDH95SystemtothereturnductingoftheexistingHVACsystem.Thefaninterlockprovision
mustbeutilizedforpropersystemperformance.
D. Installation in an Attic with an Existing Forced Air HVAC System (Whole House
Dehumidification)
ALWAYSinstallasecondarydrainpanwithadrainoroatinterruptforcondensationundertheDH95
inanattictopreventcondensateoverowthatmaydripdowndamagingtheceilingorlivingspace
below.
Installaseparate10”returnfortheDH95inacentralareaofthestructureorifthereturnductingis
adequatetapintotheexistingreturnductsystemnearthereturnairgrill.DuctthesupplyoftheDH95
SystemtothereturnductingoftheexistingHVACsystem.Thefaninterlockprovisionmustbeutilized
forpropersystemperformance.
E. Installation in a Structure with Two Forced Air HVAC Systems (Whole House
Dehumidification)
AttachtheDH95returntoanindependentreturnfromtheupperlevel.AttachtheDH95supplytothe
returnofthebasementHVACsystem.Thiswillpromotecirculationofairthroughthewholestructure
fromtheupperleveltothelowerlevelthroughtheDH95.IftheDH95isnotconnectedtobothHVAC
systems,itmaynotcontrolthehumidityoftheentirestructure.Thefaninterlockprovisionshouldbe
connectedtothelower,ducted,HVACsystemandmustbeutilizedforpropersystemperformance.
F. Installation in a Structure with No Existing Forced Air HVAC System (Whole House
Dehumidification)
WheninstallingtheDH95inastructurethatdoesnothaveaforcedairHVACsystem,asinglereturnfortheDH95
shouldbeinstalledincentralopenareaofthestructure.DO NOTlocatethereturninabathroomorakitchen.
ThesupplyoftheDH95shouldbelocatedintheremoteareasofthestructure(suchasbedrooms,den,etc.).By
ductingthisway,theairinsidethestructurewillcirculatethroughtheDH95tobelteredanddehumidied.5”
diameterductisrecommendedforbranchestothebedrooms,6”diameterductisrecommendedforbranchesto
largerareas.
G. Installation in a Sealed Crawl Space or Sealed Attic (Spot Dehumidification)
WheninstallingtheDH95insealedcrawlspaceorsealedattic,asinglereturnfortheDH95shouldbeinstalledin
centralopenareaofthestructure.Iftheareaisopenwithoutpartitionsreturnductingisnotnecessary.Supply
ductingisrecommendedtoenhancetheperformanceofthesystem,aminimumlengthofsupplyduct,3’to6’
willaidinairdistribution.Ifthearea(s)beingservedaredividedbywallsorpartitions,asupplyandreturnduct
systemisrecommended.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”.