Nordyne CMF95 Series Installation Instructions

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Ifthefurnacefailstooperatecheckthefollowing:
• Isthethermostatoperatingproperly?
• Aretheblowercompartmentdoor(s)inplace?
• Isthefurnacedisconnectclosed?
• Hasthecircuitbreakertrippedorthecontrolboardfuse
burnedopen?
• Isthegasturnedon?
• Areanymanualresetswitchesopen?
• Isthelterdirtyorplugged?
• Istheamesensorcoated?(Removeandcleanwith
steelwool.(Donotuseemeryclothorsandpaper!)
• Isthereblockageinthecondensatedrainswitch?Also
verifythatthereisnodoubletrappingofcondensate.
• Isthe secondaryheatexchangerfreeofdebrisand
clogs?
• Isevaporatorcoilcleanandfreeofdebris(Ifapplicable).
• ArealltheLED’sonthefurnacecontrolboardconstantly
ON?Ifnot,refertoTable6orthewiringdiagram(Figure
18,page29)todeterminefaultcondition.
IMPORTANTNOTE:Thefurnacewilllockoutafter5
failedattemptsforignitionandwilltryagainevery
hourifthecallforheatremains.
• Iftheinducerblowerisoperating,anditemsabovehave
beenveried,checktheblowerlimitswitchandreset
ifnecessary.SeeFigure17forcomponentlocation.
• IfthefurnaceoperateswhentheBlowerLimitSwitchis
reset,contactaqualiedservicetechniciantoidentify
andrepairtheproblem.
• If the furnace still doesn’t operate,check the ame
roll-outswitch(Figure17)andresetifnecessary.
• Ifthefurnaceoperateswhentheamerolloutswitchis
reset,contactaqualiedservicetechniciantoidentify
andrepairtheproblem.
DiagnosticDescription Green LED Red LED
ControlFault(NoPower) Off Off
L1/NeutralPolarityFault Flash Flash
1HourLockout AlternatingFlash
NormalOperation On On
PressureSwitchClosedFault On Flash
PressureSwitchOpenFault Flash On
OpenLimitSwitchFault Flash Off
MotorFault On Off
DiagnosticDescription Yellow LED
LowFlameSensorSignal ContinuousFlash
FlamePresent On
Table 6. Control Board Fault Conditions
TROUBLESHOOTING DESCRIPTION OF COMPONENTS
Thedescriptionsbelowarevariousfunctionalcomponents
thataffecttheoperationandshuttingdownofthisfurnace.
Someofthesecomponentsandtheirlocationsareshown
inFigure17.Ifanycomponentofthefurnacemustbe
replaced,useonlyfactoryauthorizedreplacementparts
speciedintheReplacementPartsListprovidedonline.
BlowerLimitSwitch:Preventsoperationwhenblower
isnotoperational.
Flame Sensor: Verieswhenaamehascarriedover
fromtheignitertotheoppositeendburner.Ifnoameis
detected,thefurnacewillshutdownwithin4seconds.
FlameRoll-OutSwitch:Veriesthattheburnerames
aredrawnintotheheatexchangertubes.Iftheburner
amesarenotproperlydrawnintotheheatexchanger,the
ameroll-outswitchwillclosethegasvalveandinitiate
theshutdowncycle.
GasValve:Controlstheowofgastotheburners.When
the gas valve is energized it automatically opens and
regulatesthegaspressureinthemanifold.
Inducer Assembly: Vents products of combustion to
theoutside.
Pressure Switch:Veries that the inducer is drawing
thecombustiongasesthroughtheheatexchanger.The
pressureswitchpreventsfurnaceoperationwithexcessive
ue/condensateblockageorimproperinduceroperation.
Main Air Limit Switch: Prevents the air temperature
leavingthefurnacefromexceedingthemaximumallowable
outletairtemperature.
Figure17.FurnaceComponents
Blower Assembly
Inducer Assembly
Gas Valve
Gas Manifold &
Burner Assembly
ON / OFF Switch
Control Board
Limit Switch
Inline Drain
Assembly
24V Transformer
Igniter
Main Air Limit Switch
Flame Sensor
Roll-Out Switch
Combustion Air Pipe
Exhaust Vent Pipe

Nordyne CMF95 Series Specifications

General

Brand	Nordyne
Model	CMF95 Series
Category	Furnace
Language	English