Nordyne M3RL Series Manual

User’sInformation / Maintenance andService Manual
M3RLSeriesFurnaces
!
IMPORTANT:
Read this owner information thoroughly
before attempting to operate or maintain
this furnace to become familiar with the
capabilities and use of your heating appli-
ance. Keep this with literature on other
appliances where you have easy access to
it in the future. If a problem occurs, check
the instructions and follow recommenda-
tions given. If these suggestions don’t
eliminateyourproblem,callyourNORDYNE
Servicing Contractor (Service PRO).
Any additions, changes, or conversions
required in order for the appliance to satis-
factorily meet the application needs must
be made by a qualified installer, service
agency, or the gas supplier using factory
specified and approved parts.
!WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings
exactly could result in serious injury
death or property damage.
!
ADVERTISSEMENT:
RISQUE D’INCENDIE OU
D’EXPLOSION
Le non-respect des avertissements de
sécuritépourrait entraîner des
blessures graves, la mort ou des
dommages matériels.
– Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
–WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a
neighbor's phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier,
call the fire department.
– Installation and service must be performed
by a qualified installer, service agency, or
the gas supplier.
– Ne pas entreposer ni utiliser de
l’essence ni d’autres vapeurs ou liquides
inflammables dans le voisinage de cet
appareil, ni de tout autre appareil.
–QUE FAIRE S’IL Y A UNE ODEUR
DE GAZ
• Ne pas tenter d’allumer aucun appareil.
•Ne toucher à aucun interrupteur
électrique;n’utiliseraucuntéléphonedans
lebâtiment.
• Évacuerl’immeubleimmédiatement.
• Appeler immédiatement le fournisseur
de gaz en employant le téléphone d’un
voisin. Respecter à la lettre les instruc-
tions du fournisseur de gaz.
• Si personne ne répond, appeler le ser-
vice des incendies.
– L’installation et l’entretien doivent être
effectués par un installateur qualifié, un
organisme de service ou le fournisseur
de gaz.

2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
21
22
M3 Downflow Furnace
1 Door Assembly
2 Filter(InsideDoor)
3 Blower Assembly
4 ControlBoard
5 Pressure Switch
6 Flame Rollout Switch
7“J”TrapHardTube
8 LowVoltageTransformer
9 In Line Drain Assembly
10 FrontHeaderBox
11 Vent Safety Switch
12 Igniter Assembly
13 Burner View Port
14 Main Limit Switch
15 Coil Cabinet Assembly (Optional)
16 FlameSensor(OnBurnerBox)
17 Gas Valve
18 Switch, Blower Door
19 Blower,Inducer
20 Orifice(InBurnerBox)
21 Aux. Limit
22 BurnerBox
Figure 1. Location of Major Components

3
GENERAL INFORMATION
This furnace has been designed and built to
provide many years of safe and dependable
home comfort, providing it is properly installed
andmaintained.With regularmaintenance,this
furnacewilloperatesatisfactorilyyearafteryear.
Abuse, improper use, and/or improper mainte-
nance can shorten the life of the appliance and
createhazardsforyou. Pleasereadthismanual
carefully to familiarize yourself with operation,
maintenance, and safety procedures for this
furnace.
A regular service and maintenance schedule
should be established to ensure efficient and
safe operation of the furnace. See Section 5 for
maintenance procedures and schedules.
Devices attached to the flue or vent for the
purpose of reducing heat loss up the chimney
have not been tested and have not been in-
cludedinthe designcertificationof thisfurnace.
We, the manufacturer, can not and will not be
responsible for injury or damage caused by the
useofsuchuntestedand/oruncertifieddevices,
accessories, or components.
!
WARNING:
ELECTRICAL SHOCK, FIRE OR EX-
PLOSION HAZARD
Failure to follow safety warnings ex-
actlycouldresultindangerousopera-
tion, serious injury, death or property
damage.
Improperservicingcouldresultindan-
gerousoperation,seriousinjury,death
or property damage.
•Beforeservicing,disconnectallelec-
trical power to furnace.
•When servicing controls, label all
wirespriortodisconnecting.Recon-
nect wires correctly.
•Verify proper operation after servic-
ing.
!WARNING:
Toavoidpossibleequipmentdamage,
fire, or death, the following instruc-
tionsmustbeobservedregardingfur-
nacelocation,combustionairrequire-
ments, and operation procedures.
Inspect the furnace installation to ensure that
the vent and combustion air intake pipes have
been installed properly.
ABOUT YOUR CENTRAL
FURNACE SYSTEM
NORDYNE has been involved in the design of
products for the manufactured home industry
since the first manufactured home or trailer
was built.
NORDYNE originated the sealed combustion
system, which separates the furnace com-
bustion system from the living area of the home
and is now a standard for the manufactured
home industry.
NORDYNE engineers developed the first cen-
tral heating system and the first central air
conditioner for manufactured homes.
NORDYNE is dedicated to bringing to its cus-
tomers the finest heating and cooling comfort
possible.NORDYNEconstantlyseekstofurther
refine its products to continuously provide ex-
ceptional comfort.
Follow the instructions in this booklet carefully
and this appliance will provide many years of
superior performance.
Ifyou wishto coolyour homeautomatically with
acentralairconditioningsysteminvestigatethe
excellentNORDYNEcoolingsystemsavailable
fromyourheatingandcoolingcontractor.These
systems are designed to work best with your
NORDYNE furnace and have been carefully
engineeredtodeliveroptimalperformancewhen
mated with NORDYNE manufactured home
furnaces.

4
NORDYNE also offers water heaters, fire-
places and ventilating systems specifically de-
signed for manufactured housing applications.
Ask your manufactured home retailer, your
heating and cooling contractor, or your dis-
tributor for more information. Write directly to
the factory (PO Box 46911, St. Louis, MO
63146) if you are unable to locate a source for
NORDYNE manufactured housing products in
your area.
1. Furnace Location
The furnace area and the vicinity of any other
gas appliance must be kept clear and free of
combustiblematerials,gasoline,andotherflam-
mable vapors and liquids. Do not store or use
flammable items such as paint, varnish, or
strippers in the vicinity of the furnace.
Do not use the furnace closet or area next to
the furnace as a storage area. This area must
be kept clear, clean, and free of lint. The
furnace must also be kept clear of loose or
exposed insulation materials. Examine the fur-
nace area when the furnace is installed or
when insulation is added. Some insulation
materials may be combustible.
Do not use this furnace if any part has been
under water. Immediately call a qualified ser-
vice technician to inspect the furnace and to
replace any part of the control system and any
gas control which has been under water.
Familiarize yourself with the controls that shut
off the gas and electrical power to the furnace.
Ifthefurnaceistobeshutdownforanextended
periodoftime,turnoffboththegasandelectrical
power. For your safety always turn off both the
gas and electrical power before performing
service or maintenance on the furnace.
2. Combustion Air Supply
A furnace needs an adequate supply of com-
bustion and ventilation air for proper and safe
operation. Follow the installation instructions
included with the furnace to properly vent air to
the combustion air inlet and exhaust the prod-
ucts of combustion to the outside from the
exhaust vent.
If the furnace is operated with a restricted com-
bustion air supply, the pressure switch will
open, turning off the gas supply to the burners.
(See Figure 1). DO NOT install a jumper wire
across this switch to defeat its function. If this
switch must be replaced, use only authorized
replacement parts from your authorized dis-
tributor.
If the furnace is operated with inadequate
combustion air supply, due to sooting of the
heat exchanger, or partial blockage of the vent
or air intake pipe, the flame roll-out control
switch located above the burners may open,
turning off the gas supply to the burners. The
flame roll-out control is a manually resettable
device (See Figure 1). If the flame roll-out
control opens again after once reset, DO NOT
install a jumper wire across this switch to
defeat its function. DO NOT reset the control
without identifying and correcting the fault con-
dition which caused the control to trip. If this
switch must be replaced, use only authorized
replacement parts from your authorized dis-
tributor.
Airopeningsinwarmairregisters,andreturnair
grilles must not be restricted.
!
CAUTION:
Combustion air must not be drawn
from occupied spaces.
To maximize heat exchanger life, the combus-
tion air must be free of chemicals which form
corrosive acidic compounds in the combustion
gases. Some examples of these chemicals are
chlorine, fluorine, and sulphur. Some common
sources of these chemicals are detergents,
bleaches,aerosolsprays,cleaningsolvents,and
a wide variety of commercial and household
products.
3. Return Air Supply
ForM3models,thereturnairopeningislocated
at the front of the furnace. The floor or platform
on which the furnace is mounted must provide
sound physical support of the furnace with no
gaps, cracks, or sagging between the furnace
andfloororplatform. Thecirculatingairductwork
must not be connected to any other heat pro-
ducing device such as a fireplace insert, stove,
etc. Doing so may result in fire, explosion,
personal injury, carbon monoxide poisoning, or
property damage.

5
Use an air filter in the front door to maintain a
clean heat exchanger.
!WARNING:
Failure to prevent products of com-
bustionfrombeingcirculatedintothe
living space can create potentially
hazardous conditions including car-
bon monoxide poisoning that could
result in personal injury or death.
4. Vent System
The furnace must always be connected to an
approved vent pipe to carry the furnace com-
bustionproductsoutdoors.Atthebeginningand
endofeachheatingseason,inspecttheoutdoor
vent terminal closely with a flashlight to deter-
mine if any of the conditions listed under the
following warning exist.
5. Maintenance
Propermaintenanceismostimportanttoachieve
the best performance from this furnace and
shouldbeperformedbyaqualifiedservicetech-
nician. Follow the maintenance schedule (see
Table1)andthe following instructions for years
of safe, trouble free operation.
•Do not place combustible materials on
or against the furnace cabinet.
•Do not store gasoline or any other flam-
mable vapors and liquids in the vicinity
of the furnace.
•Annually inspect the furnace, ductwork,
and vent system for signs of physical
deterioration.
•Change or replace the air filters monthly
during any period when the circulating
blower is operating regularly.
•Always replace the doors on the furnace
after servicing or cleaning/changing the
filters. Do not operate the furnace with-
out all doors and covers in place, except
to check burner operation.
•Avoid operating the furnace when win-
dows and doors are open.
•Be sure that the thermostat is properly
installed and is not being affected by
drafts or heat from lamps or other appli-
ances.
!WARNING:
Never operate the furnace without a
filter in place. Dust and lint in the re-
turn air can build up on the internal
components, resulting in a loss of ef-
ficiency,equipmentdamage,andpos-
sible fire.
Air Filter —An air filter is supplied with the
furnace as shipped from the factory. The filter
must be removed and cleaned monthly during
the heating season to ensure proper furnace
operation. The filter is easily cleaned with soap
water or with vacuum cleaner. New or newly
renovated homes may require more frequent
changing until the construction dust has been
removed.
Alwaysreplace the filter with a filter ofthe same
size and type as the filter being removed.
Always replace the door(s) on the furnace after
servicingorcleaning/changingthefilters.Donot
operatethefurnacewithoutthedoor(s)inplace.
To clean or replace the filters, proceed as
follows: (See Figure 2).
1) Turn furnace electrical supply to OFF.
2) Remove furnace main door.
3) Release filter retainer wire.
4) Pull out filter.
5) Vacuum or wash filter with soap water
and allow to dry.
6) Place filter and retainer wire in door.
Figure 2. Filter Installation
Filter
Front Door
(Rear View)
Retainer
Wire

6
Lubrication —The bearings in the circulating
air blower motors used in these furnaces are
pre-lubricated and sealed at the factory. No
further oiling of the bearings is required for the
life of the motor.
Blower Compartment —The blower com-
partment should be cleaned monthly during the
heatingandcoolingseasons to remove any dirt
and lint that may have accumulated in the
compartment or on the blower and motor.
Buildup of dirt and lint on the blower and motor
can create excessive loads on the motor re-
sulting in higher than normal operating tem-
peratures and possible shortened service life.
Burner Maintenance —Check the burner
flames at the start of every heating season.
Set the thermostat to a temperature setting
abovetheroomtemperature. Removethefront
door from the furnace, close the door switch
(see Figure 1), and visually inspect the burner
through the view hole to make sure that the
flame is drawn into the center of the heat
exchanger tube (see Figure 3). In a properly
adjusted burner assembly, the flame bends up
at the end of the heat exchanger tube, and the
end of the flame will be out of sight around the
bend. Theflame color should beblue, however
some light yellow streaks may occur on the
outer portions of the flame.
!CAUTION:
Some components in the burner ves-
tibule are at high temperatures while
the burners are operating. Use cau-
tionto avoid personal injury.
Inspect the burners, mounting brackets, and all
other parts in the vestibule for signs of deterio-
ration. The burner vestibule should be vacu-
umed clean and inspected annually. Open the
door switch and replace the front door.
!
CAUTION:
Do not strike any of the internal elec-
trical components while vacuuming.
6. OperatingInstructions
READ THE SAFETY INFORMATION ON
PAGE 8 BEFORE OPERATING.
!WARNING
Should overheating occur, or the gas
supply fail to shut off, shut off the
manual gas valve to the furnace be-
foreshuttingofftheelectrical supply.
!ADVERTISSEMENT:
En cas de température excessive, ou
s’il est impossible de couper
l’alimentationengaz,fermerlerobinet
manuel d’alimentation en gaz du
générateur d’air chaud avant de
couperl’alimentation électrique.
These furnaces are equipped with roll-out limit
switch(s), a vent safety switch, and a pres-
sure switch (See Figure 1). The pressure
switch verifies that the flame is receiving com-
bustion air. If the flame is not drawn into the
heat exchanger tube, the roll out limit switch or
flame sensor, will shut the furnace down.
The vent safety switch shuts the furnace down
if the vent becomes blocked or restricted.
Furnace Fails To Operate —If the furnace
does not operate, check the following:
1) Is the thermostat operating properly?
2) Is the front door in place?
3) Is the furnace disconnect closed?
4) Has the circuit breaker tripped (or fuse
blown)?
5) Is the gas turned on?
6) Is the filter dirty or plugged?
If the combustion and circulating air blowers
areoperating, and items 1 through6 have been
Figure 3. Burner Inspection
Manifold
Burner Flame

7
Table 1. Maintenance Table
MAINTENANCE ITEM
VERIFY FURNACE AREA IS FREE
OF COMBUSTIBLE MATERIALS
VERIFY COMBUSTION AND VENTILATION
AIR IS NOT RESTRICTED
VERIFY NO SIGNS OF PHYSICAL
DETERIORATION OF THE FURNACE
VERIFY NO OBSTRUCTIONS OR
RESTRICTIONS IN VENT OR CHIMNEY
VERIFY NO HOLES OR CRACKS IN VENT PIPE
VERIFY NO CORROSION IN VENT PIPE
VERIFY THAT HORIZONTAL VENT PIPES
SLOPE UPWARDS AWAY FROM FURNACE
VERIFY BURNER FLAME
CLEAN OR REPLACE FILTER(S)
CLEAN BLOWER COMPARTMENT
CLEAN BURNER ASSEMBLY
BEGINNING OF END OF EACH
EACH HEATING SEASON HEATING SEASON MONTHLY
XXX
XXX
XXX
XX
XX
XX
XX
XX
X
X
FRE
QU
EN
C
Y
O
F MAINTENAN
C
E
checked without identifying the cause of the
problem, press the red reset buttons on the
vent safety and the roll out limit switches. (See
Fig-ure 1).
IMPORTANT: If the furnace operates after
depressing the reset button on the vent
limit or roll out limit, it is an indication of a
potentially serious problem in the installa-
tion. Follow the instructions "To Turn Off
Gas To the Appliance" located in these
instructions or on the door of the furnace.
Contact a qualified serviceman to identify
and repair the problem.
MANUFACTURER WARRANTY, OWNER
RESPONSIBILITIES
It is the sole responsibility of the homeowner to
make certain the gas furnace has been cor-
rectly set up and adjusted to operate properly.
NORDYNE warrants this furnace to be free
from defects in material or workmanship for a
period of one year. A warranty certificate with
fulldetailsisincludedwiththisdocument. How-
ever,NORDYNE will not be responsible for any
costs found necessary to correct problems
due to improper setup, improper installation,
furnace adjustments, improper operating pro-
cedure on the part of the user, etc.
Some specific examples of service calls which
cannot be included in warranty payments are:
1. Converting the furnace to use another type
of gas.
2. Repairing duct work in the home found to be
faulty.
3. Correcting wiring problems in the electrical
circuit supplying the furnace.
4. Resetting circuit breakers, blown fuses or
other switches.
5. Correcting problems due to improper gas
supply pressure to the furnace.
6. Providing instructional training on how to
light and operate the furnace.
7. Correcting any problems caused by installa-
tion of an air conditioner, heat pump or other
air comfort devices.
8. Revising installation of the furnace flue as-
sembly.
9. Adjusting or calibrating of thermostat.
10. Removing any construction debris which
has fallen into flue system.
Carefully review these responsibilities with your
dealer, service company, or gas supplier so
there will be no misunderstanding at a later time.
Read Your Warranty
Please read your limited warranty completely. It
contains valuable information about your fur-
nace. If you have any questions about the
warranty information, contact your NORDYNE
distributor.

O’Fallon, MO
7080830
Specificationsandillustrationssubjecttochangewithout
noticeandwithoutincurringobligations. Printedin
U.S.A.(03/02)
¢708083.¤
7080830
Knob (Robinet)
Figure 2
1. Mettrelethermostatàlapositionminimale.
2. Débrancherl’appareilenprévisiondelaréparation.
3. Retirerlepanneau/voletd’accèsdecommande(panneausupérieur
s’ils’agitd’unmodèleàdeuxpanneaux).
4. Faire tournerlerobinetàgazdanslesensdesaiguillesd’une
montre pourl’amenersurlapositionOFF(Arrêt)Nepas
forcer(Voir Figure2).
5. Remettrelepanneau/voletd’accèsdecommandeenplace
(panneausupérieurs’ils’agitd’unmodèleàdeuxpanneaux).
1. ATTENTION! Lired'abordlalistedesmesuresdesécuritécidessus.
2. Mettrelethermostatàlapositionminimale.
3. Couperlecourantélectriquequimèneàl’appareil.
4. Cetappareilménagerétantdotéd’unsystèmed’allumageautomatique,
nepasessayerd'allumerlebrûleurmanuellement.
5. Retirerlepanneau/voletd’accèsdecommande(panneausupérieurs’il
s’agitd’unmodèleàdeuxpanneaux).
6. Fairetournerlerobinetàgazdanslesensdesaiguillesd’unemontre
pourl’amenersurlapositionOFF(Arrêt)(Voir Figure2).
7. Attendrecinq(5)minutespours’assurerdeladissipationdugaz. En
casd’odeur,ARRÊTERLEPROCÉDÉ. Suivrelesinstructionsci-
dessus(SectionB). Enl’absence detouteodeur degaz,avancer à
l’étapesuivante.
8. Faire tournerlerobinetàgazdanslesensinversedesaiguillesd’une
montre pourl’amenersurlapositionON(Marche)(Voir Figure2).
9. Remettrelepanneau/voletd’accèsdecommandeenplace(panneau
supérieurs’ils’agitd’unmodèleàdeuxpanneaux).
10. Rebrancherl’appareilsurleréseauélectrique.
11. Ajusterlethermostatàlapositiondésirée.
12. Sil’appareilnefonctionnepas,suivreles“Directivesd’arrêt”cidessous
etappelerletechniciendeservice.
1. STOP!Readthesafetyinformationaboveonthislabel.
2. Setthethermostattothelowestsetting.
3. Turn offallelectricalpowertotheappliance.
4. Theappliance’signitiondeviceautomaticallylightstheburner.Donot
trytolight burnerbyhand.
5. Removethecontrolaccessdoor/panel(upperdooriftwo-door
model).
6. Move thegas controlknob clockwise to“OFF”. (SeeFigure2)
7. Wait five (5)minutes toclear outany gas. Then smellfor gas,
includingnear thefloor. If yousmell gas, STOP! Follow “B”inabove
information.Ifyoudon’tsmellgas,gotothenextstep.
8. Move thegas controlknobcounterclockwise to“ON”.(See
Figure2)
9. Replacethecontrolaccess
door/panel(upperdoorif
two-doormodel).
10. Turn onallelectricalpower
totheappliance.
11. Turn thethermostatto
desiredsetting.
12. Iftheappliancewillnotoperate,followtheinstructions“To Turn Off
GasTo Appliance”andcallyourservicetechnicianorgassupplier.
WARNING: If you do not follow these
instructions exactly, a fire or explosion may
result causing property damage, personal
injury, or loss of life.
1. Setthethermostattothelowestsetting.
2. Turn offallelectricalpowertotheapplianceifserviceistobe
performed.
3. Removethecontrolaccessdoor/panel(upperdooriftwo-door
model).
4. Move thegas controlknob clockwise to “OFF”. Do not use
force. (See Figure2)
5. Replacethecontrolaccessdoor/panel(upperdooriftwo-door
model).
MODE D'EMPLOI
DIRECTIVES D’ARRÊT
A. Thisappliancedoesnothave apilot. Itisequippedwithanignition
devicewhichautomaticallylightstheburner. Donottrytolightthe
burnerbyhand.
B. BEFOREOPERATING smellallaroundtheapplianceareaforgas.
Be sureto smellnext tothe floor becausesome gasis heavier than
airandwillsettleonthefloor.
WHAT TO DOIF YOU SMELL GAS
•Donottrytolightanyappliance.
•Donottouchanyelectricalswitch;donotuseanyphonein
yourbuilding.
•Immediatelycallyourgassupplierfromaneighbor’sphone.
Followthegassupplier’sinstructions.
•Ifyou cannotreachyour gassupplier, callthe firedepartment.
C. Use only your hand to push inor turn the gascontrol knob. Never
use tools. If the knob willnot push inor move by hand, donot tryto
repairit,callaqualifiedservicetechnician. Forceorattemptedrepair
mayresultinafireorexplosion.
D. Donotusethisapplianceifanyparthasbeenunderwater. Immedi-
atelycallaqualifiedservicetechniciantoinspecttheapplianceandto
replaceanypartofthecontrolsystemandanygascontrolwhichhas
beenunderwater.
OPERATING INSTRUCTIONS
A. Cetappareilménagern'apasdeveilleuse. IIestdotéd’un
systèmed’allumageautomatique. Nepasessayerd'allumerle
brûleurmanuellement.
B. AVANT L’USAGE. Attentionàunepossibleodeurdegazsurtout
auniveauduplancheroùlesgazlespluslourdsontlatendancede
seconcentrer.
ENCASD’ODEURDEGAZ.
•Nemettreenmarcheaucunappareilélectrique.
•Netoucheràaucuncommutateurélectrique,nepasemployer
letéléphone.
•Quitterlebâtimentimmédiatementetavertirlacompagniedu
gazenutilisantletéléphoned'unvoisin.
•Adéfautdelacompagniedugaz,avertirleservicedes
pompiers.
C. Enfonceroufairetournerlerobinetàgazàlamainseulement.Ne
jamaisutiliserd'outils.S’iln’estpaspossibledefairetournerou
d’enfoncer lerobinetàla main,nepas essayer dele réparer. Faire
appelàunspécialiste.Forceroutenterderéparerlerobinet
pourraitêtreàl’origined’uneexplosionoud’unincendie.
D. IIestdéconseilléd’utilisercetappareilencontactprolongéavec
l’eau. Faireinspecterouremplacertoutecommandeparun
technicienqualifiésiundessystèmesdecontrôledugazs'est
trouvésousl'eau.
ATTENTION! L’inobservation de ces
instructions peut entraîner un incendie ou une
explosion pouvant causer des dammages à
votre propriétéàvotre personne, ou la mort.
POURVOTRE SÉCURITÉ.
ÀLIREAVANTL’EMPLOI
FORYOUR SAFETY
READBEFOREOPERATING
TO TURN OFF
GAS TO APPLIANCE