Nordyne CMF95 Series Installation Instructions

7
Direct Vent Installation
Thiscondensingfurnaceiscertiedforinstallationasa
DirectVent(2-pipe)appliance.DirectVent(2-pipe)furnaces
drawcombustionairdirectlyfromtheoutdoorsandthen
ventthecombustionproductsbackoutside,isolatingthe
entiresystemfromtheindoorspace.Itisimportanttomake
surethatthewholesystemissealedandclearancesto
combustiblesaremaintainedregardlessoftheinstallation
being in a conned or unconned space.This section
speciesinstallationrequirementsforDirectVent(2-pipe)
piping.Table2(page8)containsthelengthofventand
combustionairpipingforthistypeofinstallation.
Provisionsmustbemadeduringtheinstallationofthis
furnacethatprovideanadequatesupplyoffreshairfor
combustionandventilation.Thecombustionairfromthe
outsideneedstobeclearofchemicalsthatcancause
corrosion. The inlet pipe should not be placed near
corrosivechemicalssuchasthoselistedonpage5.
Airopeningsontopofthefurnaceandopeningsincloset
doorsorwallsmustneverberestricted.Ifthefurnaceis
operatedwithoutadequateairforcombustion,theame
roll-outswitchwillopen,turningoffthegassupplytothe
burners.NOTE:Thissafetydeviceisamanuallyreset
switch. DO NOT install jumper wires across these
switchesto defeattheir function orreset a switch
withoutidentifyingandcorrectingthefaultcondition.I f 
aswitchmustbereplaced,useonlythecorrectsizedpart
speciedintheReplacementPartsListprovidedonline.
VentPipeLength&Diameter
Forproperfurnaceoperation,thecombustionairandvent
pipingmustnotbeexcessivelyrestrictive.
• Theventingsystemshouldbedesignedtohavethe
minimumnumberofelbowsorturns.
• Allhorizontalrunsmustslopeupwardsfromthefurnace
at1/4inchminimumperrunningfootofvent.
• Transitiontothenalventdiametershouldbedoneas
closetothefurnaceoutletaspractical.
• Alwaysusethesamesizeoralargerpipeforcombustion
airthatisusedfortheexhaustvent.
Table2(page8)indicatesthemaximumallowablepipe
lengthforafurnaceofknowninputrate,wheninstalled
withpipingofselecteddiameterandnumberofelbows.To
usethetable,thefurnaceinputrate,thecenterlinelength
andthenumberofelbowsoneachpipemustbeknown.
Whenestimatingthelengthofventruns,consideration
mustbemadetotheeffectofelbowsandotherttings.
Thisisconvenientlyhandledusingtheideaof“equivalent
length”.Thismeansthettingsareassignedalinearlength
thataccountsforthepressuredroptheywillcause.For
example:a3”diameter,longradiuselbowisworththe
equivalentof3.5feetoflinearrun.
Theequivalentlenghtsofteesandvariouselbowsare
listedinTable2.Measurethelinearlengthofyourventrun
andthenaddintheequivalentlengthofeachtting.The
ImportantInformation
WARNING:
Furnaceinstallationusingmethodsotherthan
thosedescribedinthefollowingsectionsmust
complywiththeNationalFuelGasCode(NFGC)
andallapplicablelocalcodes.
WARNING:
Upon completion of the furnace installation,
carefullyinspectthe entire uesystemboth
insideandoutsidethefurnacetoassureitis
properlysealed.Leaksintheuesystemcan
resultinseriouspersonalinjuryordeathdue
toexposureofueproducts,includingcarbon
monoxide.
WARNING:
This furnace must not be vented with other
appliances, even if that appliance is of the
condensingtype.Thisincludeswaterheaters
ofanyefciency.Commonventingcanresult
inseverecorrosionofotherappliancesortheir
venting and can allow combustion gases to
escapethroughsuchappliancesorvents.Do
notventthefurnacetoareplacechimneyor
buildingchase.
• This furnace must be vented in compliance with
the current revision of the National Fuel Gas Code
(ANSI-Z223.1/NFPA54). Instructions for determining
the adequacy of combustion air for an installation
can be found in the current revision of the NFGC
(ANSI Z223.1 / NFPA54). Consultlocalcodes for
special requirements. These requirements are for
USinstallationsasfoundintheNFGC.
• TherequirementsinCanada(B149.1)arestructured
differently. In Canada, venting shall conform to the
requirementsofthecurrent(CAN/CGAB149.1or.2)
installationcodes.Consultlocalcodesforspecial
requirements.
CategoryIVAppliances
Thisfurnaceisclassiedasa“CategoryIV”appliance,
whichrequiresspecialventingmaterialsandinstallation
procedures.CategoryIVappliancesoperatewithpositive
ventpressureandrequiresthoroughlysealedventsystems.
Theyalso produce liquidcondensate, which isslightly
acidicandcancauseseverecorrosionofordinaryventing
materials.Furnaceoperationcanbeadverselyaffected
byrestrictiveventandcombustionairpiping.

Nordyne CMF95 Series Specifications

General

Brand	Nordyne
Model	CMF95 Series
Category	Furnace
Language	English