Installation guide

10
InstallingtheFurnaceonanMA-100Base
1. Carefully lift the furnace over the universal base pan
andsetintoposition.Avoiddamagingthefeederduct
assembly and combustion air adapter, if present.
NOTE:Makesurethefurnaceispositionedagainstthe
backendofthebase.
2. Openthefurnacedoorandfastenthefurnacetothebase
using#8x1/2”sheetmetalscrews.
3. Using the provided hose clamp, secure the exible
combustionairtubingfromtheburnertothecombustion
airadapter.
CombustionAirDuct/PipeInstallation
The CMF3 furnace must draw the combustion air from
outside(exceptforspecialinstallations)andrequiresusing
the2”X7”rectangularcombustionairductprovidedintheMA
seriesbasekitorthedirectventkit.Ifusingtherectangular
combustionairduct,followthestepsbelow:
1. Install the combustion air duct through the selected
knockoutinthebase.Fordirectventapplications,the
rearknock-outinthefurnacebasecannotbeused.
2. Installthecombustionairadapter(afterthecombustion
air duct has been positioned) to transition the 2”X7”
openingofthecombustionairducttothe2”diameterof
theburnerexibletubing.NOTE:Adapterisincludedin
theMAseriesbasekits.Forretrotapplicationsinwhich
theMAseriesbaseisalreadyinstalled,thecombustionair
adaptercanbeorderedasakit.RefertotheReplacement
PartsListformoredetailsonorderingthiskit.
3. Securetheadapterwithwoodormetalfasteners(eld
supplied),dependinguponyourinstallation.NOTE:Make
sure the gasket for the adapter is positioned properly
beforeinstallingtheadapter.
4. Attachtheexiblehosefromtheburnertothecombustion
airadapterusingtheprovidedhoseclamp.
Figure7.MA-100UniversalBase,BottomPanel
12 1/8
Feeder Duct
Opening
18 1/4
24 1/2
12 1/8
FRONT
Combustion Air
Knock-outs
(7-1/4” X 2-1/4”)
InstallingtheFurnaceonanMA-200Base
1. Carefullyliftthefurnaceoverthebasepanandsetinto
position.Theangeonthebackofthefurnaceshould
restontheinsiderailsofthebase.
2. Raisethefrontofthefurnacetoclearthegasketonthe
bottomofthefurnaceandslidethebackuntiltherear
angedropsintothe channel at therearofthebase.
NOTE:Donotdamage the combustionairadapter,if
present,whilepositioningtheunit.Makesurethefurnace
engagesthetabsontherearangeofthebase.
3. Opentheaccessdoorandfastenthefrontofthefurnace
andthebasetotheoorwith#8x1/2”sheetmetalscrews.
4. Using the provided hose clamp, secure the exible
combustionairtubingfromtheburnertothecombustion
airadapter.
MA-100 Universal Base Installation
The MA-100 base is designed primarily for replacement
installation of the CMF3 series furnace where the
manufactured home duct system may be too small or
restrictivefor proper air ow. The MA-100 base provides
approximately4inchesofadditionalplenumspacebefore
thedischargeairenterstheductsystem.SeeFigure7.
1. Usingtheuniversalbaseasaguide,locateandmarkthe
12-1/8”x12-1/8”openingfortheFeederDuct.NOTE:If
usingthecombustionairduct,knockouttheductopening
tobeused.Thenmarkthe2-1/4”x7-1/4”openingonthe
oor.
2. Cutall4sidesoftheFeederDuctopening1”largerthan
thedrawncutout.NOTE:Cuttingtheopeningto14-1/8”
x14-1/8”willallowthefourangesontheundersideof
thepaneltotintotheopening.Cutallthewaythrough
theinsulationandbottomboardsothatthecombustion
airductisunobstructedtooutsideair.
3. If applicable, cut the 2 1/4” x 7 1/4” opening for the
combustionairduct.NOTE:Cuttheopeningfortheduct
about1/8”largerthantheactualcutoutdrawn.Thiswill
allowsomeclearancewheninstallingtheFeederDuct.
4. Drilla1”diameterholeforthefuellinethroughtheoor
andbottomboardtotheoutside.NOTE:Fuellinesare
notsuppliedwiththefurnace.Theyshouldbeinstalled
tocomplywithallapplicablecodes.
5. Set the universal base in place. Drop transition duct
(Figure5)upsidedownthroughtheooropeningand
centerthetopofthefeederductin14-1/8”x14-1/8”oor
opening.
6. Usingthefeederductasaguide,markandcuta12”x
12”openinginthesupplyduct.Removethebaseand
transitionfeederduct;thencuttheopeningintothesupply
duct.
7. Insertthefeedertabsintothemainductandbendthem
overuntilthemainductedgesaretrappedtightlybetween
anges and tabs. NOTE: Metal tape may be used to
ensureanairtightconnection.
8. Setthebottombasepaneloverthefeederduct.Slitthe
cornersofthefeederductdowntothetopofthebase.
Whilethetopofthedistributionductispulledupwithone
hand,benddowneachsideofthefeederducttightlyto
thebasewiththeotherhand.Trimthemetaltoallowone
inchangeoverthetopofthebaseandsealthatange
withmetaltape.
9. Securethetoppaneltotheoorwith2screwsthrough
thefrontange.NOTE:Ifusinga“V”or“U”-boxcrossover
system,use manufacturersinstructionsforinstallation
details.