Broan CMF2 Installation guide

CMF2 80-PG CONVERTIBLE (65, 75, & 85 KBTU/H INPUTS)

CMF2 80-PO CONVERTIBLE (65, 75, & 85 KBTU/H INPUTS)

Counterﬂow Gas or Oil Heating Appliance

INSTALLATION INSTRUCTIONS

DO NOT DESTROY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

FIRE OR EXPLOSION HAZARD

• Failuretofollowsafetywarningsexactlycould

resultinseriousinjuryorpropertydamage.

• Installationandservicemustbeperformed

byaqualiedinstaller,serviceagencyorthe

gas supplier.

• Do not store or use gasoline or other

ammable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

neighborsphone.Followthegassuppliers

instructions.

• If youcannot reachyourgas supplier, call

theredepartment.

WARNING:

ATTENTION INSTALLERS:

It is your responsibility to know this product better

than your customer. This includes being able to install

the product according to strict safety guidelines and

instructing the customer on how to operate and maintain

the equipment for the life of the product. Safety should

always be the deciding factor when installing this

product and using common sense plays an important

role as well. Pay attention to all safety warnings and

any other special notes highlighted in the manual.

Improper installation of the furnace or failure to follow

safety warnings could result in serious injury, death,

or property damage.

These instructions are primarily intended to assist

qualified individuals experienced in the proper

installation of this appliance. Some local codes require

licensed installation/service personnel for this type of

equipment. Please read all instructions carefully before

starting the installation. Return these instructions to

the customer’s package for future reference.

For installation in:

• ManufacturedHomes

• RecreationalVehicles,Park Models,& Manufactured

Buildings

• ModularHomes/Buildings

TABLE OF CONTENTS

ImportantSafetyInformation ....................................3

Requirements&Codes ..............................................3

MinimumInstallationClearances ..............................4

CombustionAir&VentingRequirements ................5

General Information ...................................................6

CombustionAirQuality ..............................................6

DirectVentFurnaces .................................................7

ManufacturedHousingInstallations .......................7

Residential Installations .........................................7

VentingthroughaChimney .......................................8

VentiaireIIIorIVAirQualityPackage .......................8

CirculatingAirRequirements ....................................9

Plenums&AirDucts .................................................9

SupplyAirConnections ..........................................9

Dampers ................................................................9

Unconditioned Spaces ..............................................9

ClosetInstallations ....................................................9

FurnaceFilter ..........................................................10

Furnace Installation ..................................................10

General Information .................................................10

BeforeYouInstallthisFurnace ................................10

Locating the Unit .....................................................10

MA-200BaseInstallation ........................................11

InstallingthefurnaceonanMA-200Base ..............12

MA-100UniversalBaseInstallation ........................12

InstallingthefurnaceonanMA-100Base ..............12

CombustionAirDuct/PipeInstallation ...................13

SRJ Roof Jack Installation ......................................13

Damper Installation .................................................14

CB-200ACottageBaseInstallation ......................... 14

Fuel Connections .....................................................15

GasPiping-PGSeriesOnly ...................................15

LeakCheck ..........................................................15

HighAltitudeApplication ......................................16

ConvertingtoLPGas ........................................... 16

OilPiping-POSeriesOnly .....................................17

FuelLineHook-up:SingleLineSystem ...............17

FuelLineHook-up:TwoLineSystem ...................17

Hook-upProcedure ..............................................17

EliminatingAirLeaks ...........................................17

FuelOilType ........................................................17

Electrical Connections ............................................. 18

Pre-ElectricalChecklist ...........................................18

LineVoltage ............................................................. 18

WiringConnections .................................................18

Grounding................................................................18

ThermostatConnections .........................................19

HeatAnticipator ...................................................19

Blower Speed ..........................................................19

ConstantBlowerOperation ..................................19

Startup&Adjustments ............................................20

Important Safety Information ...................................20

Pre-StartChecklist ..................................................20

RefrigerantCharging ...............................................20

OperatingInstructions-PGDirectIgnition .............. 20

ShuttingOfftheGasSupply ................................20

CheckingtheInputoftheFurnace .......................21

CheckingtheInletGasLinePressure .................. 21

CheckingtheManifoldPressure ..........................21

AdjustingtheManifoldPressure ..........................21

Installing the Pressure Gauge .............................. 21

AdjustingtheBurner ............................................21

OperatingInstructions-POOilBurners .................. 22

Start-upProcedure...............................................22

AirBleed-SinglePipeInstallation .........................22

OilBurnerShutdownProcedure ..........................22

FlameAdjustment ................................................22

Electrode Setting .................................................. 22

Switching from Interrupted to Intermittent

IgnitionControl .....................................................22

FiringRateConversion ............................................23

OperatingSequence .................................................23

PGGasFurnaces ...................................................23

POOilFurnaces ......................................................23

Troubleshooting ........................................................24

PGDirectIgnition-GasGun...................................24

POOilFurnace .......................................................25

ControlModuleStatusIndicator ..............................26

ComponentFunctions .............................................26

Unit Maintenance ...................................................... 27

Figures&Tables ....................................................... 28

Figure18.CMF2PhysicalDimensions ................ 28

Figure19.CMF2WiringDiagram ......................... 29

Figure20.FurnaceComponentLocation ............. 30

Installation/PerformanceChecklist ....................... 32

IMPORTANT SAFETY INFORMATION

INSTALLER:Pleasereadallinstructionsbeforeservicing

this equipment. Pay attention to all safety warnings and

any other special notes highlighted in the manual. Safety

markings are used frequently throughout this manual to

designate a degree or level of seriousness and should not

be ignored. WARNING indicates a potentially hazardous

situation that if not avoided, could result in personal injury

or death. CAUTION indicates a potentially hazardous

situation that if not avoided, may result in minor or moderate

injury or property damage.

WARNING:

ELECTRICAL SHOCK, FIRE OR EXPLOSION

HAZARD

Failuretofollowsafetywarningsexactlycould

resultinseriousinjuryorpropertydamage.

Improper servicing could result in dangerous

operation, serious injury, death or property

damage.

• Before servicing, disconnect all electrical

powertoairhandler.

• Whenservicingcontrols,labelallwiresprior

todisconnecting.Reconnectwirescorrectly.

• Verifyproperoperationafterservicing.

WARNING:

Donotusethisapplianceifanyparthasbeen

submerged under water. Immediately call a

qualied service technician to inspect the

applianceandtoreplaceanypartofthecontrol

system and any gas control that has been

submergedunderwater.

PROPOSITION 65 WARNING: This product

contains chemicals known to the state of

Californiatocausecancer,birthdefectsor

otherreproductiveharm.

WARNING:

REQUIREMENTS & CODES

WARNING:

Thisunitmustbeinstalledinaccordancewith

instructions outlined in this manual during

the installation, service, and operation of

this unit. Unqualied individuals should not

attempt to interpret these instructions or

installthisequipment.Failuretofollowsafety

recommendations could result in possible

damage to the equipment, serious personal

injuryordeath.

• Allmanufacturedandresidentialhousinginstallations

must be installed in accordance with these instructions,

all applicable local building codes and the current

revisionoftheNationalFuelGasCode(ANSIZ223.1/

NFPA54),InstallationofOilBurningEquipment(ANSI/

NFPA31) or the National Electric Code (ANSI/NFPA

70), the Manufactured Home Construction & Safety

Standard,Title24CFR,Part3280,orwhenthisstandard

isnotapplicable,theStandardforManufacturedHome

InstallationManufacturedHome Sites,Communities

andSetups(ANSI225.1).Residentialinstallationsmust

alsoconformtothestandardforChimey’s,Fireplaces,

Vents,&SolidFuelBurningAppliances(NFPA211).

• Useonlywithtypeofgasoroilapprovedforthisfurnace.

Refer to the furnace rating plate.

• Installthisfurnaceonlyinalocationandpositionas

speciﬁed on page 4.

• Provideadequatecombustionandventilationairtothe

furnacespaceasspeciedonpages5-8.

• Provideadequateclearancesaroundtheventairintake

terminalasspeciedinFigure1(page8).

• Combustion products must be discharged outdoors.

Connectthisfurnacetoanapprovedventsystemonly,

asspeciedonpages7-8.

• Never test for gas leaks with an open ame. Use a

commercially available soap solution to check all

connections.Seepages15-16.

• Thisfurnaceisdesignedtooperatewithamaximum

external pressure rise of 0.5 inches of water column.

ConsultTable6(page19),andtheratingplateforthe

proper circulating air ow andtemperature rise. It is

important that the duct system be designed to provide

thecorrectowratesand external pressure rise.An

improperly designed duct system can result in nuisance

shutdowns, and comfort or noise issues.

• Whensupplyductscarryaircirculatedbythefurnace

to areas outside the space containing the furnace, the

return airshall also behandled byduct(s)sealed to

the furnace casing and terminating in the conditioned

space.Seepages9-10.

• Thisfurnacemaynotbeusedfortemporaryheatingof

buildings or structures under construction.

• The Commonwealth of Massachusetts requires

compliancewithregulation248CMR4.00and5.00for

installation of through – the – wall vented gas appliances

asfollows:

1. Fordirect-ventappliances,mechanical-ventheating

appliances or domestic hot water equipment, where

the bottom of the vent terminal and the air intake is

installed below four feet above grade the following

requirementsmustbesatised:

a.)Acarbonmonoxide(CO)detectorandalarmshallbe

placedoneachoorlevelwheretherearebedrooms.

The detector shall comply with NFPA 720 (2005

Edition)andbemountedinthelivingareaoutside

thebedroom(s).

b.)A(CO)detectorshallbelocatedintheroomthat

housestheapplianceorequipmentandshall:

• Bepoweredbythesameelectricalcircuitasthe

applianceorequipment.Onlyoneserviceswitch

shallpowertheapplianceandthe(CO)detector;

• Havebatteryback-uppower;

• MeetANSI/UL2034Standardsandcomplywith

NFPA720(2005Edition);andApprovedandlisted

by a Nationally Recognized Testing Laboratory as

recognizedunder527CMR.

c.)A Product-approvedventterminalmustbeused,

andifapplicable,aproduct-approvedairintakemust

be used. Installation shall be in strict compliance

with the manufacturer’s instructions. A copy of

the installation instructions shall remain with the

appliance or equipment at the completion of the

installation.

d.)Ametalorplasticidenticationplateshallbemounted

at the exterior of the building, four feet directly above

the location of vent terminal. The plate shall be of

sufﬁcient size, easily read from a distance of eight

feetaway,andread“GasVentDirectlyBelow”.

2. Fordirect-ventappliances,mechanical-ventheating

appliances or domestic hot water equipment where

the bottom of the vent terminal and the air intake is

installed above four feet above grade the following

requirementsmustbesatised:

a.)A(CO)detectorandalarmshallbeplacedoneach

oorlevelwheretherearebedrooms.Thedetector

shallcomplywithNFPA720(2005Edition)andbe

mountedinthelivingareaoutsidethebedroom(s).

b.)The(CO)detectorshall:

• Belocatedintheroomthathousestheappliance

orequipment;

• Behard-wiredorbatterypoweredorboth.

• ShallcomplywithNFPA720(2005Edition).

c.)Aproduct-approvedventterminalmustbeused,and

ifapplicable,aproduct-approvedairintakemustbe

used. Installation shall be in strict compliance with the

manufacturer’sinstructions.Acopyoftheinstallation

instructions shall remain with the appliance or

equipment at the completion of the installation.

MinimumInstallationClearances

• Accessforpositioningandservicingtheunitmustbe

considered when locating unit. The need to provide

clearance for access to panels or doors may require

clearance distances over and above the requirements.

• This appliance must be installed in accordance with

clearances listed in Table 1. The furnace must be installed

with ample clearance for easy access to the air ﬁlter,

blower assembly, burner assembly, controls, and vent

connections.

• Locateandinstallthisunitinpositionasspeciedon

pages10& 11.This unit isdesigned only forIndoor

installations and should be located with consideration

of minimizing the length of the supply and return ducts.

Table1.MinimumClearanceRequirements

INSTALLATION CLEARANCES

CLOSET ALCOVE

Front* 6" 18"

Rear 0" 0"

Sides 0" 0"

To p 17" 17"

Duct w/in 3ft of furnace 1/4" 1/4"

Vent 6” 6”

Plenum 1" 1"

Roof Jack Barrel 0” 0”

†

NOTES:

* ServiceClearance

AlcoveInstallations-Allow18in.minimumclearancefrom front of

unit to nearest wall or partition for servicing.

Closetinstallations-Requireareturnairgrillinstalledinthedoor

or a partially louvered door across the opening for proper air

circulation.Forclearances6”orgreater,theclosetmusthavean

open free area of 235 in

minimum.Forspecialclearancesbetween

1”-5”,requirementsarealouvereddoorwithaminimumof250

(1613cm

)freearea.Afullylouveredclosetdoorisstrongly

recommended for both installation types.

LEFT

SIDE

FRONT

RIGHT

SIDE

REAR

VENT

The information listed below is for reference purposes only

and does not necessarily have jurisdiction over local or state

codes.Alwaysconsultwithlocalauthoritiesbeforeinstalling

any gas appliance.

DuctSystems

• USandCANADA:AirConditioningContractorsAssociation

(ACCA) Manual D, Sheet Metal and Air Conditioning

ContractorsNationalAssociation(SMACNA),orAmerican

Society of Heating, Refrigeration,and Air Conditioning

Engineers(ASHRAE)FundamentalsHandbook

Electrical Connections

• US:NationalElectricalCode(NEC)ANSI/NFPA70

• CANADA:CanadianElectricalCodeCSAC22.1

General Installation

• US:CurrenteditionoftheNFGCandtheNFPA90B.For

copies,contacttheNationalFireProtectionAssociation

Inc.,BatterymarchPark,Quincy,MA02269;orAmerican

GasAssociation,400N.Capitol,N.W.,WashingtonDC

20001orwww.NFPA.org

• CANADA:NSCNGPIC.Foracopy,contactStandardSales,

CSA International, 178 Rexdale Boulevard, Etobicoke

(Toronto),Ontario,M9W1R3Canada

Safety

• US: (NFGC) NFPA 54–1999/ANSI Z223.1 and the

Installation Standards, Warm Air Heating and Air

ConditioningSystemsANSI/NFPA90B.

• CANADA: CAN/CGA-B149.1 and .2–M00 National

StandardofCanada.(NSCNGPIC)

• Sufcientclearanceforunobstructedairowthrougha

louvered door must be maintained in order to achieve

ratedperformance.Airreturntothefurnacemusthave

theminimumrequiredtotalfreearea:

200 in

(1290cm

)forfurnaceonly.Mayalsoinclude

return air grille and frame assembly P/N 902989 or wall

mount grille P/N902999).

235 in

(1516cm

)with4tonA.C.orH.P.installed.

250 in

.(1613cm

)with4tonA.C.orH.P.installed&

1”specialclearance.

390 in

(2516cm

)withupto5tonA.C.orH.P.installed.

COMBUSTION AIR & VENTING

REQUIREMENTS

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below

foreachapplianceconnectedtotheventing

system being placed into operation could

resultincarbonmonoxidepoisoningordeath.

The following steps shall be followed with

eachindividualapplianceconnectedtothe

venting system being placed in operation,

whileallotherappliancesconnectedtothe

ventingsystemarenotinoperation:

1. Seal any unused openings in the venting

system.

2. Inspecttheventingsystemforpropersizeand

horizontalpitch,asrequiredintheNational

Fuel Gas Code, ANSI Z223.1/NFPA 54 or

the CSA B149.1, Natural Gas and Propane

Installation Codes and these instructions.

Determine that there is no blockage or

restriction, leakage, corrosion and other

deciencies which could cause an unsafe

condition.

3. Asfaraspractical,closeallbuildingdoors

andwindowsandalldoorsbetweenthespace

in which the appliance(s) connected to the

ventingsystemarelocatedandotherspaces

ofthebuilding.

4. Closereplacedampers.

5. Turnonclothesdryersandanyappliancenot

connected to the venting system. Turn on

anyexhaustfans,suchasrangehoodsand

bathroomexhausts,sotheyareoperatingat

maximumspeed.Donotoperateasummer

exhaustfan.

6. Follow the lighting instructions. Place the

appliance being inspected into operation.

Adjust the thermostat so appliance is

operatingcontinuously.

7. Test for spillage from draft hood equipped

appliances at the draft hood relief opening

after5minutesofmainburneroperation.Use

theameofamatchorcandle.

8. Ifimproperventingisobservedduringanyof

theabovetests,theventingsystemmustbe

correctedinaccordancewiththeNationalFuel

GasCode,ANSIZ223.1/NFPA54and/orCSA

B149.1,NaturalGasandPropaneInstallation

Codes.

9. After it has been determined that each

applianceconnected to theventingsystem

properlyventswhentestedasoutlinedabove,

returndoors,windows,exhaustfans,replace

dampers and any other gas-red burning

appliancetotheirpreviousconditionsofuse.

WARNING:

GeneralInformation

WARNING:

Thisfurnacemustbeinstalledbyaqualied

installing agency and in accordance with

applicable local codes and ordinances that

governthistypeofequipment.Failuretoproperly

installthefurnace,baseassembly,andventing

systemasdescribedhereinmaydamagethe

equipmentand/orthehome,cancreateare

or asphyxiation hazard, violates U.S. listing

requirements,andwillvoidthewarranty.This

furnaceisNOTapprovedforinstallationwith

splitsystemairconditioning.UseaNORDYNE

packagedairconditioningsystem.

• 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.ConsultwithB149.1andlocalcodeofcials

forCanadianinstallations.

Dependingonthetypeofinstallation(SeeTable1),the

CMF2Seriesfurnacecandrawcombustionairfromoutside

thehome(directvent)orfromthespacebeingconditioned.

These high quality, direct vent furnaces are used for

manufactured housing, recreational vehicle, and residential

applications. They are certiﬁed to the UL307 standards

(UL307-Aforoilmodels;UL307-Bforgasmodels),and

can be installed in a variety of applications, as shown in

Table 2.

TheCMF2furnaceisavailableinpowergas(PGmodels)

orpoweroil(POmodels)andcanbeconvertedfrompower

oil to power gas, and vice versa. The power gas models

are designed for operation with either natural or propane

CombustionAirQuality

CAUTION:

Combustion air must not be drawn from a

corrosiveatmosphere.

Provisions for adequate combustion air and ventilation air

mustbeinaccordancewiththeANSIZ223.1/NFPA54,

(NationalFuelGasCode),ANSI/NFPA31(Installationof

OilBurningEquipment),andallapplicablelocalcodes.

The installation of the furnace must allow for adequate

supplyoffreshairforcombustion.Airopeningsontop

of the furnace and openings in closet doors or walls

must never be restricted. The combustion air opening

of the furnace must be designed and located to prevent

blockage by snow.

If the furnace is operated without adequate air for

combustion,theameroll-outswitchwillopenandshut

off the gas supply to the burners. NOTE:Thissafetydevice

(LP) gas. The ring rate of the CMF2 80 Convertible

Seriescanbeeld-installedusingacertiedNORDYNE

conversion kit by a qualiﬁed service technician. Refer to

page 6 for conversion information.

CAUTION:

Exhaust fans, clothes dryers, replaces and

otherappliancesthatforceairfromthehouse

totheoutdoorscancreateanegativepressure

insidethehouse,resultinginimproperfurnace

operationorunsafeconditionssuchasameroll

out.Itisimperativethatsufcientairexchange

with the outdoors is provided to prevent

depressurization.Additionalinformationabout

howtotestfornegativepressureproblemscan

befoundintheNFGC.

TYPE OF

INSTALLATION

FURNACE

BASE

TYPE OF

EXHAUST

DUCTED

APPLICATION

DIRECT VENT

SYSTEM REQUIRED

ManufacturedHousingor

RecreationalVehicle

MA-100orMA-200

Universal Base

NORDYNESRJ

RoofjackOnly

Ye s Ye s

Residential

†

MA-100orMA-200

Universal Base

NORDYNESRJRoofjack

oranExistingChimney*

Ye s Ye s

Residential

†

CB-200ACottageBase

NORDYNESRJRoofjack

oranExistingChimney*

Ye s Ye s

Residential

†

CB-200ACottageBase

NORDYNESRJRoofjack

oranExistingChimney*

No No

†Residentialisdenedasasingle-storynon-manufacturedhousinginstallation.

*ConsulttheVentingRequirementssection(page#)formoredetailsonproperlyventingthisappliancethroughanexistingchimney.

Table2.CMF2InstallationTypes

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.

If a switch must be replaced, use only the correct sized part

speciﬁed in the Replacement Parts List provided online.

The combustion air from the outside needs to be clear of

chemicals that can cause corrosion. Excessive exposure

to contaminated combustion air will result in safety and

performance related problems. The list below are examples

of chemical contaminants found in a wide variety of some

commoncommercialandhouseholdproducts:

Permanent wave solutions

Chlorinatedwaxesandcleaners

Chlorinebasedswimmingpoolchemicals

Water softening chemicals

De-icingsaltsorchemicals

CarbonTetrachloride

Cleaningsolvents(perchloroethylene)

Printing inks, paint removers, varnishes, etc.

HydrochloricAcid

Cementsandglues

Antistaticfabricsofteners

Masonryacidwashingmaterials

When drawing combustion air from underneath the home,

a vent or duct of at least 18 in

of free area should be

installed outside and completely unobstructed. When using

the combustion air duct, make sure it extends through

theoor.Whenusingthedirectventkit,thecombustion

air opening must be located in the same pressure zone

astheueexitoftheroofjackorchimney.Refertothe

instructions provided with the kit for more information.

Direct Vent Furnaces

DirectVent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 conﬁned or unconﬁned space.

Fordirectventapplications,eitherthecombustionairduct

providedwiththeMASeriesbasekitorthedirectventkit

can be used. The direct vent kit must be ordered separately.

OnlyforaspecialCB-200Acottagebaseinstallationcan

theCMF2drawthecombustionairfromtheconditioned

space.TheCB-200Acottagebasekitmustbeordered

separately. Refer to the replacement parts listing provided

with the furnace to order the direct vent kit or the cottage

basekit.Followtheinstructionsprovidedwiththekitsfor

proper installation.

When unsure about combustion air supply availability,

adirectventsystemshouldbeused.Forsmallrooms,

conﬁned spaces, tight construction or similar situations

in which the combustion air requirements of the furnace

might not be met, a direct vent system must be used.

ManufacturedHousingInstallations

For all manufactured housing applications, the CMF2

furnace must be vented using the SRJ series roofjack.

The instructions for selecting the proper roofjack for your

installation are detailed later in these instructions.

Residential Installations

WARNING:

This furnace must never be connected to a

chimney ue serving a separate appliance

designedtoburnsolidfuel.

For residential applications (See Table 2), the CMF2

furnace may be vented through the SRJ series roofjack

or through an existing chimney. Figure 10 (page 14)

displays instructions for selecting the proper roofjack for

your installation. If venting through an existing chimney,

the venting system must be in accordance with these

instructions, all applicable local building codes, the National

FuelGasCode(ANSIZ223.1/NFPA54),theInstallation

ofOil-BurningEquipmentstandard(ANSI/NFPA31),and

thestandardforChimneys,Fireplaces,Vents,andSolid

Fuel-BurningAppliances(NFPA211).

WARNING:

When venting through a chimney, check the

chimney for soot, leaks, obstructions, and

proper installation.

The materials used to construct the venting system must

be capable of withstanding exposure to temperatures

of at least 700° F.The existing chimney servicing this

furnace must be vertical. Horizontal distances to an

existing chimney must be as short as possible, and the

connecting pipe must slope upward to the chimney at not

less than a 45° angle. The total length of the sloping pipe

must not exceed 6 ft. The venting system must have no

obstructions or sharp bends where soot and other foreign

matter can accumulate.

If an inspection determines that the chimney is obstructed,

thechimneymustbecleanedandtheconnectinguepipe

must be cleaned or replaced.

If venting a CMF2 power oil furnace into an existing

chimney, a barometric damper can be installed at the

vent connection of the furnace to regulate the draft. The

barometric damper must be properly installed per the

manufacturer’s instructions. Refer to all applicable codes

to determine whether or not a barometric damper can

be used for your CMF2 power oil furnace installation.

The barometric damper used must be installed such

that air from the conditioned space can only enter the

uepassageway.Donotuseadoubleactingbarometric

damper.Alluepipejointsshouldbefastenedwithsheet

metal screws for rigidity.

The chimney height, required draft, and number of

appliances served by the chimney must be in accordance

with all applicable codes. To prevent down draft, the

chimney should extend at least 2 feet above the peak of

theroof.SeeFigure1.

Itisrecommendedthatthefurnaceueservenoother

appliances. When the chimney serves only the furnace, the

ueareamustbesizedaccordingtoallapplicablecodes.

Theminimuminternalareaoftheuemustbeequaltoat

leasttheareaofthefurnaceueexit. When two or more

appliancesmustventthroughacommonue,thearea

ofthecommonueshouldbesizedinaccordancewith

all applicable codes.

When an existing furnace is removed or replaced in a

venting system, the venting system may not be properly

sized to vent the attached appliances. The venting system

must be checked to ensure proper venting. Improperly sized

venting systems can result in the formation of condensate,

leakage, spillage, etc. Refer to the National Fuel Gas

Code (ANSI Z223.1/NFPA 54), and the Installation of

Oil Burning Equipment standard (ANSI/NFPA 31) for

correcting improper venting systems.

VentingThroughaChimney

WhenventingtheCMF2throughanexistingchimney,the

materials, sizing, and installation of the chimney must be

inaccordancewiththeANSIZ223.1/NFPA54,(National

FuelGasCode),ANSI/NFPA31(InstallationofOilBurning

Equipment),NFPA211(Chimneys,Fireplaces,Vents,and

SolidFuel-BurningAppliances)andallapplicablelocal

codes. The materials used must be capable of withstanding

exposuretotemperaturesofatleast700°F.TheCMF2

powergasunitsarefan-assisted.

VentilaireIIIorIVAirQualityPackage(Accessory)

CAUTION:

MAINTAIN 2 1/2” MINIMUM CLEARANCE

BETWEEN FLUE PIPE AND FLEX DUCT. FAILURE

TO COMPLY WITH THIS RESTRICTION COULD

CAUSE EQUIPMENT DAMAGE. VENTILAIRE III

ILLUSTRATED OTHER LISTED VARIATIONS

AVAILABLE. CHECK WITH MANUFACTURER.

TheVentilaireairqualitypackagesareavailabletomeet

theventilationrequirementsasoutlinedinH.U.D.Standard

Part3280.103(b)(2).Thesepackagesintroduceoutdoor

air into the living space during furnace blower operation.

TheVentilAireIValsoservestoexhaustmoistand/orhot

airfromtheatticspace.SeeFigure2fortypicalinstallation.

Completeinstallationinstructionsaresuppliedwitheach

air quality package.

VENT PIPE

3 FEET MIN.

ROOF JACK ASSY.

ROOF CAP ASSY.

FLEX DUCT

CEILING TRIM COLLAR

CONNECTOR

DRAW BAND

FURNACE

Figure1.TypicalInstallation

VentilAireIII

VentilAireIV

Figure 2. VentilAire III & IV

CIRCULATING AIR REQUIREMENTS

WARNING:

Allsupplyductsmustbesecuredtothefurnace

withsheetmetalscrewsandadequatelysealed.

Whensupplyairisprovidedthroughthebottom

oftheunit,thejointbetweenthefurnaceand

theplenummustbeairtight.

Thesurfacethatthefurnaceismountedonmust

providesoundphysicalsupportofthefurnace

withnogaps,cracksorsaggingbetweenthe

furnaceandtheoororplatform.

Supply air ducts must not be connected to

any other heat producing device such as a

replaceinsert,stove,etc.Thismayresultin

re, explosion, carbon monoxide poisoning,

personalinjury,orpropertydamage.

Plenums&AirDucts

This unit is designed only for use with a bottom return

supply duct and must be installed in accordance with

thestandardsoftheNationalFireProtectionAssociation

Standard for Installation of Air Conditioning Systems

(NFPA90A),StandardforInstallationofResidenceType

WarmAirHeatingandAirConditioningSystems(NFPA

90B),andallapplicablelocalcodes.NFPApublications

are available by writing to: National Fire Protection

Association,BatterymarchPark,Quincy,ME02269orvisit

www.NFPA.orgontheweb.

• Designtheairductsaccordingtomethodsdescribed

bytheAirConditioningContractorsofAmerica(ACCA).

• Airductsmustbealuminum,tinplate,galvanizedsheet

steel, or other approved materials for outlet or return

air ducts. Snap-Lock or Pittsburgh-Lock seams are

preferred.Allothertypesofseamsmustbemadetight

to prevent leakage.

• It isgood practiceto sealall connectionsand joints

with industrial grade sealing tape or liquid sealant.

Requirements for sealing ducts vary from region to

region.Consultwithlocalcodesforrequirementsspecic

to your area.

• Gaspipingmustnotruninorthroughanyoftheairduct

system.

SupplyAirConnections

• The supply duct system must be designed so that the

static pressure measured external to the furnace does

not exceed the listed static pressure shown on the

furnace rating plate. The supply air must be delivered

totheheatedspacebyduct(s)securedtothefurnace

casing, running full length and without interruption.

• Ductsystemmustbedesignedsothatnosupplyregisters

are located in duct system directly below the furnace.

Dampers

Anautomatedshutoffdamperisrequiredwhenthehome

is air conditioned by a self-contained unit. A damper

is required to prevent chilled air from owing over the

furnace heat exchanger. This damper is designed to ﬁt

inthefeederductcavity,directlyunderthefurnace.For

proper installation, refer to the instructions provided with

the damper. See replacement parts list provided online.

UnconditionedSpaces

Allductworkpassingthroughunconditionedspacemust

be properly insulated to minimize duct losses and prevent

condensation. Use insulation with an outer vapor barrier.

Refer to local codes for insulation material requirements

Closet Installations

WARNING:

Failure to comply with the the following

instructionsmayresultinre,asphyxiationor

carbonmonoxidepoisoning.

For proper air circulation, closet installations require

a return air grill installed in the door or side wall that

exchanges with the living area of the home as shown in

Figure3(page10).Apartiallylouvereddoormayalsobe

used across the opening. Return air openings should not

be located to draw air directly from a bathroom. Grilles

placedinasidewallrequirea6”clearancefromthewall

to the furnace so that the air may enter the front grille of

the furnace. In addition, all return air systems, including

the oor andceiling systems, must meetthe following

conditions:

• Thereturnairopening,regardlessofitslocationinthe

closet, must not be smaller than size speciﬁed on unit

datalabel.Iflocatedintheoor,theopeningmustbe

provided with a means of preventing its inadvertent

closurebyatobject(s)placedovertheopening.

• Thereturn-airopeningintothecloset,regardlessofits

location, must have an open free area of 200 in

(1290

)minimum.

• Thecross-sectionalareaofthereturnductsystem(in

oororceiling)leadingintotheclosetmustnotbeless

than 200 in

(1290cm

).

• Thetotalfreeareaoftheopeningsintheoororthe

ceiling registers serving the return air duct system must

not be not less than 300 in

(1935cm

).

• Materialslocatedinthereturnductsystemshallhave

aamespreadclassicationof200orless.

• Noncombustiblepanshavingoneinchupturnedanges

are located beneath openings in a oor return duct

system.

• Hollow spaces used as ducts or plenums for

environmentalairmaycontainmineral-insulatedmetal

sheathed cable, aluminum sheathed cable, electrical

metallic tubing, rigid metal conduit, exible metal

conduit(nottoexceed4ft),ormetal-cladcables.Wiring

materials, ﬁxtures, are to be suitable for the expected

ambient temperatures to which they will be subjected.

• Thenegativepressureintheclosetmustnotbelessthan

minus 0.05 inches water column with the closet door

closedandthefanoperatingathighspeed.Areading

belowminus0.05”indicatesadirtylterorarestricted

return air system.

• For oor return systems, the manufactured housing

manufacturer or installer shall affix a prominent

marking on or near the appliance where it is easily

read when the closet door is open. The marking shall

read:“CAUTION, HAZARD OF ASPHYXIATION. DO

NOTCOVER ORRESTRICT FLOOR RETURNAIR

OPENING.”orequivalent.NOTE: This label is supplied

with the instruction manual in each furnace.

• Forclosetinstallationwithlessthan6”frontclearance,

but not less than 1”, a louvered door must be used

having a minimum 200 in

(1290cm

)freeareaopening

directlyinlinewithopeningsinthefurnacedoor.Afully

louvered door having the minimum free area is also

permittedifthefronttoleranceisnotlessthan4”.Adjust

duct registers to obtain a temperature rise within the

range speciﬁed on the furnace nameplate.

Furnace Filter

WARNING:

Never operate the furnace without a lter in

place.Accumulatingdustinthereturnaircan

build up on internal components, resulting

inlossofefciency,equipmentdamage,and

possiblere.

• CMF2furnacesaresuppliedwithasingleairlterwhen

shipped from the factory. Accessingthelterdoesnot

require tools and can be easily removed from the inside

of the access door. The ﬁlter is secured to the door with

FURNACE INSTALLATION

NOTE: Since all installations are different, the sequence of

these steps may differ from the actual installation. These

installation procedures are suggested for typical furnace

installations. OnlyqualiedHVACtechniciansshould

installthisfurnace.

GeneralInformation

TheCMF2furnaceisdesignedonlyforindoorinstallations

and can be readily connected to the high static duct

system of a home. Units are approved for single/multistory

residential or mobile/modular/manufactured structures in

freestanding/closet/alcovedownowonlycongurations.

This appliance will provide many years of safe and

dependable comfort, providing it is properly installed

andmaintained.Abuse,improperuse,and/orimproper

maintenance can shorten the life of the appliance and

create unsafe hazards. Please read all instructions before

installing the unit.

Approved installation, operation, and maintenance of

this appliance must be in accordance with the listed

speciﬁcations contained in these instructions and other

documents supplied with the furnace and/or optional air

conditioning equipment. Unless it is noted differently in this

manual, only use factory authorized kits and accessories

when modifying this appliance. Refer to local authorities

having jurisdiction for further information.

BeforeYouInstallthisFurnace

√ This equipment is securely packaged at the time of

shipment and upon arrival should be carefully inspected

for damage prior to installing the equipment at the job

site.Claimsfordamage(apparentorconcealed)should

be ﬁled immediately with the carrier.

√Checktheelectricalsupplyandverifythepowersupply

is adequate for unit operation. The system must be wired

and provided with circuit protection in accordance with

local building codes. If there is any question concerning

the power supply, contact the local power company.

√Verify the air delivery of the furnace is adequate to

handle the static pressure drop of the coil, ﬁlter, and

duct work.

LocatingtheUnit

• Surveythejobsitetodeterminethebestlocationfor

installing the unit. Consideration should be given to

availability of electric power, service access, and noise.

Figure 3. Closet Installation

a retaining bracket. It is recommended that the ﬁlter be

cleaned or replaced monthly. Newly built or recently

renovated homes may require more frequent changing

until the construction dust has minimized.

• Replacement ﬁlters are available at most local retailers.

Inspect ﬁlters frequently and replace when necessary

with ﬁlter of same dimensional size. Filtersdesignedto

remove smaller particles such as pollen, may require

additional maintenance.

Figure 4. MA-200 Base Pan

FRONT

Combustion Air

Knock-outs

(7-1/4” X 2-1/4”)

Feeder Duct

Opening

Flue

Location

24 1/8

8 3/8

12 1/8

9 1/8

18 1/4

MA-200 Base Installation

TheMA-200baseisdesignedforO.E.M.andreplacement

installationoftheCMF2seriesfurnace.Thewarmairduct

system should be designed so the duct static pressure

external to the furnace does not exceed the static pressure

listed on the furnace data label. Floorcut-outsmustbe

carefully located to avoid misalignment of the furnace

and air duct.

1. Usingthebasepan(Figure4)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andmarkthe2-1/4”

x7-1/4”openingontheooralso.

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angesontheunderside

of the base pan to ﬁt in 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. 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.Usingthefeeder

ductasaguide,markandcuta12”x12”openingin

the supply duct.

6. Insert the feeder tabs into the main duct and bend them

over tightly so that the main duct edges are trapped

betweenangesandtabs.NOTE:Metaltapemaybe

be used to ensure an air tight connection.

7. Install the base pan around the feeder duct. Secure

with 2 screws in the holes near the rear of the base

pan.

8. Slit the corners of the feeder duct down to the top of

thebasepan(Figure6).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aoneinchangeover

thetopofthebasepanandsealthatangewithmetal

tape.

• Thedimensions of the roomor alcovemustbe able

to accommodate the overall size of the unit and the

installation clearances in Table 1 (page 4). Physical

dimensions for this furnace are shown in Figure 18

(page29).

• Theunitmustbeleveledatinstallationandattachedto

a properly installed duct system.

• Thesurfacethatthefurnaceismountedonmustprovide

sound physical support of the unit.

Figure 5. Transition Duct

Heater Duct Below Joists

Flange

Bend

Over Tabs

Base

Floor

Joists

Slit 4 Corners

Bend Down 4 Sides

TRANSITION

DUCT

Figure6.FeederDuctInstallation

Heat Duct Below Joists

Base

Feeder Duct

Floor

Joists

Cut This Line

Bend Over

Along This Line

NOTE:Ifusinga“V”or“U”-boxcrossoversystem,use

manufacturers instructions for installation details.

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 CMF2 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 distribution 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.

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.

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”)

CombustionAirDuct/PipeInstallation

TheCMF2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.SeeTable2(page

6)forspecialcombustionairinstallations. NOTE: If using

the direct vent kit, the kit must be installed before the

furnaceispositioningonthebase.Followtheinstructions

provided with the 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.

3. Insert the vent pipe into the bottom of the roof jack with

locking slot pointed towards furnace. Slide the pipe

into the roof jack to a length that allows convenient

reach to the connection at the top of the furnace.

4. Ease the roof jack assembly through the openings.

NOTE: The lower portion of the outer barrel must

extend through the ﬁnished ceiling as indicated on the

barrel. Use sealant or caulking on the roof or adaptor

tosealundertheashingoftheroofjackassembly.

5. Extend the vent pipe until the locking slot engages the

screwinthetopofthefurnaceuepipe.

6. Twist the vent pipe to lock the two pipes together and

tightenthescrew.Alljointsandconnectionsshouldbe

inspectedbeforestartupofthefurnace.SeeFigures

10&11(page14).

7. Fastentheceilingtrim/restopplatesaroundtheupper

barrelwithfournailsorwoodscrews(eldsupplied).

NOTE:ThetopsectionofroofjackmodelsSRJ-3,-4,

and-5canberemovedfordwellingtransit.Ifthetopis

removed, remaining openings must be sealed from rain,

debris,etc.,untilthetopisreinstalled.Aplasticaccessory

cap must be fastened to the lower roof jack section using

the same screws securing the roof jack cap assembly.

IMPORTANT: When the top section of the roof jack is

removed for transit, a special warning label must be

attached adjacent to the fuel line connection of the gas

or oil burner. The special warning label is supplied with

two piece roof jack assemblies.

SRJRoofJackInstallation

Required ceiling and roof cut-out openings must be

accurately located to prevent hazardous misalignment

ofthefurnaceandroofjack.Figure8displaysatypical

installation for maufactured housing applications. Refer

toFigure9(page14)todetermineappropriateSRJroof

jack and accessories required for your installation. Install

only SRJ series roof jack as speciﬁed on the furnace label.

NOTE: Aroofjackadaptorisrequiredforslopedroofs.

WARNING:

• Theroofjackandventpipeasdeterminedfrom

thechartinFigure9mustbeapplied.

• Theindicatinglinenearthebottomoftheroof

jackmustextendbelowthenishedceiling.

• Theventpipemustbeattachedtothefurnace

uecollarwithprovidedsheetmetalscrews.

• DONOTinstallanyelbows(adjustableornon-

adjustable)orastackdamperintheventing

system.

1. Measureandcutan81/4”diameterholethroughthe

roofandceilingthatisalsoindirectlinewiththeue

connection on the top of the furnace.

2. Center theadaptor opening over theroof opening.

Use sealant or caulking under the adaptor. Use rooﬁng

nails or screws on wood construction or sheet metal

screws on metal roofs.

Flashing

Barrel

Ceiling Plate

Vent

Ventilation

Knock-Out

DUCT

CONNECTOR

Return Air

Grille and

Filter

Power Supply

Connection

Access

Door

Base Pan

Fuel Line

Feeder Duct

Combustion

Air Duct

FURNACE

ASSEMBLY

ROOF JACK

ASSEMBLY

Combustion Air

Adapter (Not Shown)

is to be Installed

Over Combustion

Air Duct

Figure8.TypicalFurnaceInstallationfor

ManufacturedHousingApplications

Figure 11. Vent Pipe Installation

VENT PIPE

FLUE PIPE

OF FURNACE

TURN TO LOCK-

TIGHTEN SCREW

RA-S4

RA-S3

RA-S2.5

4/12

3/12

2-1/2/12

None

Flat

NOTES:

SRJ1 & SRJ2 Models are one piece construction

SRJ3, SRJ4, & SRJ5 Models are two piece construction

-C Models are two piece construction

OPTIONAL:

Add -C for Raised Inlet Models (Example: SRJ3-34-C)

RoofJack Adaptor (for mounting roof jack on pitched roof)

Protective Cap (used when top of roofjack is removed)

Use Adaptor

Model No.

When roof pitch is:

1/2 Minimum

Furnace

CMF Series

57"

And Ceiling

Height is:

Add Suffix

For Vent Pipe

-28

7'6"

-34

-40

Ceiling Trim Plates

When Ceiling

Cavity is:

Use Roof Jack

Model No.

49" to 59"

37" to 48"

SRJ5

25" to 36"

13" to 24"

12" or Less

SRJ4

SRJ3

SRJ2

SRJ1

Adaptor

14" Removable SRJ3, SRJ4, & SRJ5

25" Removable All -C Models

Figure9.SelectionofRoofJack&AccessoriesChart

DamperInstallation

Anautomaticshut-offdamperisavailable(seereplacement

partslist).Anautomatedshutoffdamperisrequiredwhen

thehomeisairconditionedbyaself-containedunit.This

damper is designed to ﬁt in the feeder duct cavity, directly

underthefurnace.Adamperisrequiredtopreventchilled

air from owing over the furnace heat exchanger. For

proper installation, refer to the instructions provided with

the damper.

CB-200A Cottage Base Installation

TheCMF2canbeinstalledonaCB-200Acottagebase

incertainapplications,aslistedinTable2(page6).Refer

to the Replacement Parts List for information on ordering

thisbase.Forinstallation,refertotheinstructionsthatare

providedwiththeCB-200Abasekit.

Figure10.RoofJack

Insert Sliding Pipe

Fasten Ceiling

Trim Plates

Ceiling

Roof

Roof Jack Adaptor

Install With Line

Below Ceiling

Remove three screws

to separate two piece

models; replace with

protective cap for

transit only

Fasten roof flashing to adaptor

or flat roof; apply sealant or

caulking underneath

Fasten adaptor to

sloped roof; apply

sealant or caulking

underneath

FUEL CONNECTIONS

• Allgaspipingmustbeinstalledincompliancewith

localcodesandutilityregulations.Intheabsence

oflocalcodesthegaslineinstallationmustcomply

withthelatesteditionoftheNationalFuelGasCode

(ANSI Z223.1) or (CAN/CGA B149.1 or .2) Installation

Codes.

• Somelocalregulationsrequiretheinstallationofa

manualmainshut-offvalveandgroundjointunion

externaltothefurnace.Theshut-offvalveshould

bereadilyaccessibleforserviceand/oremergency

use. Consult the local utility or gas supplier for

additional requirements regarding placement of

themanualmaingasshut-off.

• Gaspipingmustneverruninorthroughairducts,

chimneys,gasvents,orelevatorshafts.

• Compoundsusedonthreadedjointsofgaspiping

mustberesistanttotheactionsofLPpropanegas.

• Themaingasvalveandmainpowerdisconnectto

thefurnacemustbeproperlylabeledbytheinstaller

incaseemergencyshutdownisrequired.

• Flexiblegasconnectorsarenotrecommendedfor

thistypeoffurnacebutmaybeusedifallowedby

local jurisdiction. Only new exible connectors

maybeused.Donotusea connectorwhichhas

previouslyservicedanothergasappliance.

• Adriplegshouldbeinstalledintheverticalpipe

runtotheunit.

TheCMF2furnacemaybeinstalledwithgasentrythrough

the bottom of the furnace. When installing the gas line,

connect a separate gas line from the gas meter to the

burnerwithamanualshut-offvalveinstalledinthesupply

lineatthefurnace.Alwaysusenewcleanpipingandroute

the line in an easily accessible manner. The piping and

threading must be free from cutting burrs and defects.

Thelinemustbedurable,substantial,andgastight.An

additionalmainmanualshut-offvalvemaybeinstalled

inthegassupplylinetoshut-offthemainfuelsupply,if

desired by the homeowner or required by local codes.

The proper gas supply line size can be determined using

the gas piping chart, shown in Table 3. Black pipe is the

most practical for natural gas, because of the larger sizes

required.Coppertubingwithaninternalcoatingoftinis

recommendedforusewithpropane(LP)gasinstallations.

Table3liststhegasowcapacitiesforstandardpipesizes

as a function of length in typical applications based on

nominal pressure drop in the line.

Gaspiping-PGSeriesOnly

Table3.PipeLengthSelectionChart

TypeofPipe

MaximumPossiblePipe

LengthRequiredfor

DifferentPipeDiameters

1/2” 5/8” 3/4” 1”

Black Iron Pipe for Natural Gas 20’ - 60’ 100’

AluminumorCopperTubingfor

Natural Gas

10’ - 30’ -

AluminumorCopperTubingfor

LP Gas

- 40’ 100’ -

LeakCheck

FIRE OR EXPLOSION HAZARD

Failuretofollowsafetywarningsexactlycould

resultinseriousinjuryorpropertydamage.

Nevertestforgasleakswithanopename.

Use a commercially available soap solution

made specically for the detection of leaks

tocheckallconnections.Areorexplosion

mayresultcausingpropertydamage,personal

injuryorlossoflife.

WARNING:

After the gas piping to the furnace is complete, all

connections must be tested for gas leaks. This includes

pipe connections at the main gas valve, emergency

shutoffvalveandexiblegasconnectors(ifapplicable).

The soap and water solution can be applied on each

FIRE OR EXPLOSION HAZARD

• Failuretofollowsafetywarningsexactlycould

resultinseriousinjuryorpropertydamage.

• Installationandservicemustbeperformed

byaqualiedinstaller,serviceagencyorthe

gas supplier.

• Do not store or use gasoline or other

ammable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redepartment.

WARNING:

joint or union using a small paintbrush. If any bubbling is

observed, the connection is not sealed adequately and

must be retightened. Repeat the tightening and soap

check process until bubbling ceases.

IMPORTANTNOTE:Whenpressuretestinggassupply

linesatpressuresgreaterthan1/2psig(14inchW.C.),

thegassupplypipingsystemmustbedisconnected

fromthefurnacetopreventdamagetothegascontrol

valve.Ifthetestpressureislessthanorequalto1/2

psig(14inchW.C.),closethemanualshut-offvalve.

required that you measure the gas input rate. This may

be accomplished in the usual way, by clocking the gas

meter and using the local gas heating value. To check the

input of the furnace see page 21.

IMPORTANTNOTE:Observetheactionoftheburners

tomakesurethereisnoyellowing,liftingorashback

oftheame.

ConvertingtoLPGas

TheCMF2furnaceisshippedfromthefactoryforusewith

natural gas but can be converted to use liquid propane

gas.UsethefollowingprocedureandFigure12(page17)

for converting the gas burner.

1. SetthermostattoOFF.

2. Turn off all power to the furnace.

3. Openfurnacedoorandlocatethegasvalve.

4. PushinonthegasknobandturnittoOFF.

5. Shut off gas supply at meter.

6. Disconnect gas burner electric cord, gas piping to

burner, and thermostat leads.

7. Remove nuts securing burner in place.

8. Disconnect inlet pipe union at burner.

9. Disconnect the two wires leading to gas control valve.

10.Removebolts securingU-shaped manifoldplate to

oriﬁce assembly.

11. Remove the main oriﬁce and replace it with the correct

LP fuel oriﬁce as shown in Table 4. Refer to the rating

plate on the furnace to determine the ﬁring rate for

your application. NOTE: If the ﬁring rate of your furnace

has been converted, make sure the appropriate LP

oriﬁce for the new ﬁring rate is installed.

12. Remove the regulator converter on top of the gas valve.

Invert the converter so that the red ring will be located

at the bottom and the LP stamping on the converter

appears up.

13. Screw converter back into the regulator, hand tight

plus 1/8 turn.

14. Reinstall the burner assembly into the furnace.

15. Reconnect the gas piping and electrical wires to the

gas valve.

16.Openthemanualshut-offvalveandfollowtheOperating

Instructions outlined on page 20.

HighAltitudeApplication

Installation of this furnace at altitudes above 2,000 feet

shall be in accordance with local codes, or in the absence

oflocalcodes,theNationalFuelGasCode,ANSIZ223.1/

NFPA54orNationalStandardofCanada,NaturalGas&

PropaneInstallationCodeCGAB149.1.Pleaseconsult

your local code authority.

WARNING:

Thereductionofinputratingnecessaryforhigh

altitudeinstallationmayonlybeaccomplished

withfactorysuppliedorices.Donotattemptto

drilloutoricesintheeld.Improperlydrilled

orices may cause re, explosion, carbon

monoxidepoisoning,personalinjuryordeath.

TheCMF2 furnaceisshippedfromthe factorywithits

oriﬁces and gas regulator setting for natural gas operation

atsealevelaltitudes.At2,000feet,theNFGCrequires

that this appliance be derated 4% for each 1,000 feet of

altitude.Forexample,theinputneedstobereduced8%

at 2,000 feet, 12% at 3,000 feet, etc. This deration is in

reference to the input rate and gas heating value at sea

level.

Highaltitudeconversionforthisfurnacerequiresreducing

the oriﬁce size or decreasing the manifold pressure. When

decreasing the manifold pressure, the pressure must not

besetbelow3.2inWC.Ifthepressureneedstobeset

below3.2inWCtoachieveproperderation,thenchange

the oriﬁce size and raise the manifold pressure back to

3.5inWC.

Afterchangingtheregulatorpressureortheorices,itis

* Timesarebasedonnaturalgasatanaverageof1,000BTUpercubicfoot,aburnermanifoldpressureof3.5inWC,andameterdialsizeof1cubicfoot.

** TimesarebasedonLPgasatanaverageof2,500BTUpercubicfoot,aburnermanifoldpressureof3.5inWC,andameterdialsizeof1cubicfoot.

Table4.Natural&LPGasOrices

Burner

Designation

Firing Rate

Input (BTUH)

Natural Gas

Orice Number

Natural Gas

TimePerRev.* (sec)

LP Gas

Orice

Number

LP Gas

Time PerRev.** (sec)

GasGun-65-DI-S 65,000 24 55 43 138

GasGun-75-DI-S 75,000 20 48 40 120

GasGun-90-DI-S 85,000 18 43 37 106

Oilpiping-POSeriesOnly

The following procedures are recommended as good

practice. However, requirements of local codes and

ordinances, H.U.D. Manufactured Home and Safety

StandardsorNationalFireProtectionAssociationmust

be satisﬁed, where they apply, for an approved installation.

• Use a tank capacity suitable for the application with a

weatherproof, capped ﬁll opening and shielded vent to

let air in as fuel is used. NOTE: The inside of the tank

mustbecleanbeforelling.Allwater,rust,sediment,

andotherforeignmattermustbeushedout.

• If a two pipe system is used or if oil is taken from the

bottomofthetank,alterisrecommended.Amanual

shut-off valve mayalso beused ona singlepipe or

two pipe system. NOTE: Local codes may dictate the

speciﬁc installation requirements.

• Afuelortankgaugeisrecommendedforeasychecking

ofthefuellevel.Checkthegaugeusingadipstick.

• Locatethestoragetankconvenientlynearthehome.For

above ground fuel tank installations, the tank may rest

threetofourinchesofftheground.Fueltanksmayalso

beburiedifproperlycoatedtoresistcorrosion.Forbelow

ground fuel tank installations, the vertical dimension

from the bottom of the tank to the fuel pump must not

exceed 10 feet. Keep the tank ﬁlled especially in the

summer to reduce the accumulation of condensation.

FuelLineHook-Up:SingleLineSystem

The single line system is highly recommended when

vertical lift, from bottom of tank to pump, is less than 8

feet.Asinglelinehookuphastheadvantageofcosting

less and giving quieter operation.

FuelLineHook-Up:TwoLineSystem

Two line systems should only be used when the vertical

lift exceeds 8 feet.

1. Install the oil feed line as outlined in the Hook-up

Procedure.

2. Install the oil pump bypass plug in the bottom return

port.

3. Run the return line up through the furnace base to

the return port of the pump. Run the other end of the

linetothetank,using3/8”O.D.coppertubingor1/4”

pipe with the ends capped, and routing the line so it

stays clean.

4. Insert the return line through the second opening in

the duplex bushing. If the bottom of the tank is lower

than the pump intake, the tube should be inserted 3

or 4 inches from the tank bottom. If the bottom of the

tank is higher than the pump intake, the return line

shouldextendnotmorethan8”insidethetank.

Hook-UpProcedure

1. Use3/8”O.D.coppertubingforthefuelline.Capthe

end with tape to keep out dirt while the line is being

routed.SeeFigure13(page18).

2. Installduplexbushingfortwo3/8”linesinthetoptting

of the tank.

3. Insert one end of the tubing through the duplex bushing

untilitis3”to5”fromthebottomdrain.Tightenthe

bushing.

4. Route the fuel line where it will not be subject to

damage.Makeallbendsgradualandavoidkinksthat

mightrestrictoilow.

5. Opentheburneraccessdoor.Connecttheoillineto

the intake port on the pump. Tighten other port plugs

on the pump.

6. Makesuretheoillineisairtight!NOTE:Airleakscan

cause the pump to lose prime and will create other

problems such as nozzle failure, odors, rumbling noise,

and false safety shut down.

7. Insert the short length of the copper tube level with

the bottom of the duplex bushing. Tighten the bushing.

Formthetubeintoaninverted“U”toserveasavent.

EliminatingAirLeaks

To eliminate problems caused by air in the oil line, all

connections in the oil supply line and all plugs, nuts, and

ﬁttings on the pump must be airtight, including the nut

that covers the pressure adjustment. It is important that

thehook-upbedonewithagoodaringtool.

FuelOilType

Grade No. 1 may be used where the oil supply is subject to

low temperatures. Do not use fuel oil heavier than Grade

No.2.Biodieselblendsupto5%(B5)arealsoacceptable.

DO NOT USE GASOLINE, CRANKCASE OIL, OR ANY

OIL CONTAINING GASOLINE.

WARNING:

Failure to keep supply oil clean may cause

failureofcertaincomponentssuchasthefuel

pumpgears,checkvalve,shaftseal,orburner

nozzlewhichmayresultinaburnerre.

Figure12.LP&NaturalGasConversion

Orifice

Inlet

U-Shaped

Manifold

Regulator

Converter

Gas Control Knob

• Electrical connections must be in compliance with

all applicable local codes and ordinances, and with

the current revision of the National Electric Code

(ANSI/NFPA70).

• ForCanadianinstallations,theelectricalconnections

andgroundingshallcomplywiththecurrentCanadian

ElectricalCode(CSAC22.1and/orlocalcodes).

Pre-ElectricalChecklist:

√Verifythevoltage,frequency,andphaseofthesupply

source match the speciﬁcations on the unit rating plate.

√Verifythattheserviceprovidedbytheutilityissufcient

to handle the additional load imposed by this equipment.

RefertotheunitwiringlabelorTable5(page19)for

proper high and low voltage wiring.

√Verifyfactorywiringisinaccordancewiththeunitwiring

diagram(Figure18,page29).Makesurenoconnections

loosened during shipping or installation.

Line Voltage

• Anelectricaldisconnectmustbelocatedwithin

sight of and easily accessible to the unit. This

switchshallbecapableofelectricallyde-energizing

the outdoor unit. See unit data label for proper

incomingeldwiring.Anyotherwiringmethodsmust

be acceptable to authority having jurisdiction.

• Itisrecommendedthatthelinevoltagetotheunitbe

supplied from a dedicated branch circuit containing

the correct fuse or circuit breaker for the unit. See

Table5(page19)forunitspecications.

• Overcurrentprotectionmustbeprovidedatthebranch

circuit distribution panel and sized as shown on the unit

rating label and according to applicable local codes.

• Useonlycopperwireforthelinevoltagepowersupply

tothisunit.Use14-2TypeNMcableorcodeagency

listed conduit and a conduit connector for connecting

the supply wires to the unit.

• If replacing any of the original wires supplied with

the unit, the replacement wire must be copper wire

consisting of the same gauge and temperature rating.

• Providepowersupplyfortheunitinaccordancewith

the unit wiring diagram, and the unit rating plate.

The installer should become familiar with the wiring

diagram/schematic before making any electrical

connectionstotheunit.SeeFigure18.

Wiring Connections

1. Opentheappliancedoorforaccesstothecontrolbox.

2. Remove the control box cover.

3. Connecttheblackwireofthefurnacetotheblackwire

of the power supply cable.

4. Connectthethewhitewireofthefurnacetothewhite

wire of the power supply cable.

5. Connectthegroundwireofthepowersupplycable

to the green screw in the control box of the furnace.

6. Verifyallelectricalconnectionsaresecurelyconnected.

7. Replace the control box cover.

Grounding

WARNING:

Theunitcabinetmusthaveanuninterruptedor

unbrokenelectricalgroundtominimizepersonal

injuryifanelectricalfaultshouldoccur.Donot

usegaspipingasanelectricalground!

This unit must be electrically grounded in accordance

with local codes or, in the absence of local codes, with

theNationalElectricalCode(ANSI/NFPA70)ortheCSA

C22.1ElectricalCode.Usethegroundinglugprovidedin

the control box for grounding the unit.

ELECTRICAL SHOCK, FIRE OR

EXPLOSION HAZARD

Failuretofollowsafetywarningsexactlycould

resultinseriousinjuryorpropertydamage.

Improperservicingcouldresultindangerous

operation, serious injury, death or property

damage.

• Before servicing, disconnect all electrical

powertofurnace.

• Whenservicingcontrols,labelallwiresprior

todisconnecting.Reconnectwirescorrectly.

• Verifyproperoperationafterservicing.

WARNING:

ELECTRICAL CONNECTIONS

Figure13.RecommendedTankHook-Up

200-300GallonTank

Drain

End of Oil Supply Line

3" to 5" Above

Bottom Drain

Guide pipe

Gauge

Vent with

Cap

2" Duplex

Bushing

2" Fill

3/8" Oil Supply Line

Note: Additional venting may

be required if tank is filled rapidly.

ThermostatConnections

• Thermostatconnectionsshallbeinaccordancewiththe

instructions supplied with the thermostat and the indoor

equipment. The low voltage wires must be properly

connected to the units low voltage terminal block. Route

R&W from the thermostat to the burner compartment.

ConnectR to one of the low voltage terminals of the

burner. Connect W to the burner’s other low voltage

terminal.

• Asinglestagethermostatisusedwiththisequipment

and must operate in conjunction with any installed

accessories.

• Thethermostatshouldbemountedabout5feetabovethe

ooronaninsidewall.DONOTinstallthethermostaton

an outside wall or any other location where its operation

may be adversely affected by radiant heat from ﬁreplaces,

sunlight, or lighting ﬁxtures, and convective heat from

warm air registers or electrical appliances. Refer to the

thermostat manufacturer’s instruction sheet for detailed

mounting and installation information.

• Theheatanticipatorofthethermostatshouldbeadjusted

to .4 amps for power oil models, and .9 for power gas

direct ignition models.

HeatAnticipator

Set the heat anticipator according to the instructions

supplied by the thermostat manufacturer. To determine

theheatanticipatorsetting:

1. Addthecurrentdrawofthesystemcomponents;or

2. MeasurethecurrentowonthethermostatR-W circuit

after the circulating blower motor has started.

BlowerSpeed

TheCMF2furnaceisequippedwitha3speedPSCmotor

thatispre-setatthefactoryforHIGHspeedoperation.

For optimumsystem performance and comfort, it may

be necessary to change the factory speed setting. This

is accomplished by changing a wire connection at the

blower motor. Refer to the wiring diagram label on the

insideofthepaneldoororseeFigure18(page29)for

wiring conﬁguration. Table 6 lists the proper circulating air

owandtemperaturerisefortheCMF2furnace.

CAUTION:

Toavoidpersonalinjuryorpropertydamage,

makesurethemotorleadsdonotcomeinto

contactwithanyuninsulatedmetalcomponents

oftheunit.

• High Speed Operation:Connecttheblack wire from

the fan switch to the black wire of the blower motor.

NOTE: This is the factory default setting and should not

be changed if high speed operation is desired.

• Medium Speed Operation:Connect the black wire

from the fan switch to the blue wire of the blower motor.

• Low Speed Operation:Connecttheblack wire from

the fan switch to the red wire of the blower motor.

ConstantBlowerOperation

TheFANON&OFFswitchislocatedontopofthecontrol

box. This switch provides either automatic operation of the

blower through the thermostat or constant blower opeation.

CMF 80 PG

Convertible

CMF 80 PO

Convertible

FactorySetFiringRate(btu/hr)* 75,000 75,000

HeatingCapactiy(btu/hr) 56,000 60,000

KitConvertedFiringRate(btu/hr)**

65,000

85,000

65,000

85,000

AFUERating(%) 75+ 80+

OriceNumber(NaturalGas) 20 N/A

OriceNumber(PropaneGas) 40 N/A

BurnerNozzleforOil N/A 0.60gph;A;80

Blower D x W 10 x 7 10 x 7

MotorH.P.-Speed-Type 1/4-3-PSC 1/4-3-PSC

MotorFLA 6.0 6.0

FuseorBreaker 15Amps 15Amps

Nom.AnticipatorSetting 0.6 0.6

TemperatureRiseRange(

F) 55

-85

-85

NOTES:

Electrical:Allmodelsare115volt,60Hz,1phase.Thermostat

circuitis24V,60Hz,15VAC.

Gasconnections:1/2”NPT.

AFUE=AnnualFuelUtilizationEfciency

* Ratingsto2,000feet.Over2,000ft,reduceratingsby4%for

each additional 1,000 ft above sea level.

** TheringrateoftheCMF80Convertibleseriesfurnacescanbe

changed using an approved conversion kit.

Table5.CMF2Specications

Table6.CMF2AirowData

External

Static

Pressure

(in WC)

Airﬂow (CFM)

Lowspeed

For

65Kbtu/hInput

MediumSpeed

For

75Kbtu/hInput

HighSpeed

For

85Kbtu/hInput

0.1 730 920 1000

0.2 690 880 960

0.3 650 840 900

0.4 610 780 860

0.5 560 740 810

0.6 510 690 760

Pre-StartCheckList

√Verifythepolarityoftheconnectionsarecorrect,the

line voltage power leads are securely connected and

the furnace is properly grounded.

√Verify the thermostat wires (R & W) are securely

connected in the burner compartment.

√Verifythegaslineservicepressuredoesnotexceed

10.0inchesofW.C.,andisnotlessthan4.5inchesW.C.

fornaturalgas.ForLPgasthelineservicepressure

mustnotexceed14in.W.C.,andmustnotbelessthan

11.0in.W.C.

√Verifytheroll-outandmanualresetswitchisclosed.If

necessary, press the red button to reset a switch. DO

NOTinstallajumperwireacrossaswitchtodefeat

itsfunction.Ifaswitchreopensonstartup,DONOT

reset the switch without identifying and correcting the

fault condition.

√Verifytheblowerdoorisinplace,closingthedoorswitch

in the line voltage circuit.

√Verifythegaslinehasbeenpurgedandallconnections

are leak free.

OperatingInstructionsforPGDirectIgnition

Burner

Do not perform these steps until all of the safety checks

havebeencompleted:

1. STOP!Readallsafetyinformationonthispage.

2. SetthethermostattoOFFortoitslowestsetting.

3. Turn off all electric power to the appliance. NOTE: This

appliance is equipped with an ignition device which

automaticallylightstheburner.DONOTtrytolight

the burner by hand.

4. Turn the latch and open the furnace door.

5. Push in the gas control knob and turn to OFF.

IMPORTANT: DO NOT FORCE. Wait 10 minutes

toclearoutanygas.Ifyoustillsmellgas,STOP!

andreadWHATTODOIFYOUSMELLGAS. If you

don’t smell gas, go to the next step.

6. TurnthegascontrolknogtoON.

7. Closethefurnacedoorandturnthelatch.

8. Turn on all electric power to the appliance.

9. Turn the thermostat to ON and set to the desired

setting.

10.Iftheappliancewillnotoperateafteronere-try,follow

theinstructionsShuttingOfftheGasSupplybelow

and call your service technician or gas supplier.

ShuttingOfftheGasSupply

1. SetthethermostattoOFFortoitslowestsetting.

2. Turn off all electric power to the appliance if service

is to be performed.

3. Turn the latch and open the furnace door.

4. PushinthegascontrolknobandmovetoOFF.DO

NOTFORCE.

5. Closethefurnacedoorandturnthelatch.

FIRE OR EXPLOSION HAZARD

• Failure to follow safety warnings exactly

could result in serious injury or property

damage.

• Installationandservicemustbeperformed

bya qualied installer, service agency or

thegassupplier.

• Do not store or use gasoline or other

ammable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redepartment.

WARNING:

START-UP & ADJUSTMENTS

ImportantSafetyInformation

WARNING:

Allsafetyinformationmustbefollowedduring

the start-up and operation of the furnace.

Unqualiedindividualsshouldnotattemptto

interprettheseinstructions.Improperservicing

couldresultindangerousoperation,property

damage,personalinjuryordeath.

• Thisappliancedoesnothaveapilot.Itisequippedwith

an ignition device which automatically lights the burner.

Donottrytolighttheburnerbyhand.

• BEFORELIGHTINGOROPERATINGsmellallaround

the appliance area for gas. Be sure to smell next to the

oor because some gas is heavier than air and will

settleontheoor.

• Use only your hand to push in and move the gas

control lever. Never use tools. If the lever will not push

in by hand, don’t try to repair it, call a qualiﬁed service

technician.Forceorattemptedrepairmayresultina

ﬁre or explosion.

• Shouldoverheatingoccur,orthegassupplyfailtoshut

off,turnthemanualgasvalvetotheapplianceOFF.

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Broan CMF2 Installation guide

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