Goodman GMSS96 User manual

5151 San Felipe Suite 500
Houston, TX 77056
www.goodmanmfg.com • www.amana-hac.com
©2014 - 2015 Goodman Manufacturing Company, L.P.
I NSTALLATION I NSTRUCTIONS FOR
*MSS9* & *CSS9*
S
INGLE -S TAGE G AS F URNACE
IOG-2009E
10/2015
(Type FSP CATEGORY IV Direct
or Non Direct VentAir Furnace)
These furnaces comply with requirements em-
bodied in theAmerican National Standard / Na-
tional Standard of CanadaANSI Z21.47·CSA-2.3
Gas Fired Central Furnaces.
Installer:
Affix all manuals
adjacent to the unit.
As a professional installer you have an obligation to know
theproductbetterthanthecustomer.Thisincludesallsafety
precautions and related items.
Prior to actual installation, thoroughly familiarize yourself
with this Instruction Manual. Pay special attention to all
safety warnings. Often during installation or repair it is
possible to place yourself in a position which is more
hazardous than when the unit is in operation.
Remember, it is your responsibility to install the product
safely and to know it well enough to be able to instruct a
customer in its safe use.
Safety is a matter of common sense...a matter of thinking
before acting. Most dealers have a list of specific good
safety practices...follow them.
Theprecautionslistedinthis Installation Manual areintended
as supplemental to existing practices. However, if there is
adirect conflict between existing practices and the content
ofthismanual, the precautions listed here takeprecedence.
RECOGNIZE THIS SYMBOL
AS A SAFETY PRECAUTION.
is a registered trademark of Maytag Corporation or its related companies
and is used under license. All rights reserved.
TABLEOF CONTENTS
SAFETY CONSIDERATIONS .......................................... 3
SHIPPING INSPECTION ............................................ 4
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS.................... 4
TOTHE INSTALLER ............................................. 5
PRODUCT APPLICATION ............................................. 5
LOCATION REQUIREMENTS & CONSIDERATIONS ......................... 6
CLEARANCES AND ACCESSIBILITY ................................... 7
EXISTING FURNACE REMOVAL ..................................... 8
THERMOSTAT LOCATION .......................................... 9
COMBUSTION & VENTILATION AIR REQUIREMENTS ..................... 9
INSTALLATION POSITIONS ............................................ 9
HORIZONTAL APPLICATIONS & CONSIDERATIONS .......................10
FURNACE SUSPENSION ..........................................10
FRONT COVER PRESSURE SWITCH TUBE LOCATION ................10
DRAIN TRAP AND LINES ........................................10
LEVELING .....................................................10
ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS ..............10
DRAIN PAN ...................................................10
FREEZE PROTECTION ...........................................10
PROPANE GAS/HIGH ALTITUDE INSTALLATIONS .......................10
VENT/FLUE PIPE & COMBUSTION AIR PIPE .........................11
DUAL CERTIFICATION:NON-DIRECT/DIRECT VENT .................11
MATERIALS AND JOINING METHODS ..............................11
PROPER VENT/FLUE AND COMBUSTION AIR PIPING PRACTICES ......12
TERMINATION LOCATIONS ........................................12
CANADIAN VENTING REQUIREMENTS ..............................13
STANDARD FURNACE CONNECTIONS ..............................13
VENT/INTAKE TERMINATIONS FOR INSTALLATION
OF MULTIPLE DIRECT VENT FURNACES .........................17
CONCENTRIC VENT TERMINATION.................................18
SIDE WALL VENT KIT..........................................18
CONDENSATE DRAIN LINES & DRAIN TRAP ..........................18
GENERAL DRAIN INFORMATION ...................................19
FIELD SUPPLIED DRAIN .........................................19
UPFLOW MODEL INSTALLED VERTICALLY ..........................19
DRAIN EXITING RIGHT SIDE .....................................20
DRAIN EXITING LEFT SIDE ......................................20
UPFLOW MODEL INSTALLED HORIZONTALLY
WITH RIGHT SIDE DOWN ....................................20
UPFLOW MODEL INSTALLED HORIZONTALLY
WITH LEFT SIDE DOWN ......................................21
COUNTERFLOW MODEL INSTALLED VERTICALLY ....................21
DRAIN EXITING LEFT SIDE ......................................21
DRAIN EXITING RIGHT SIDE .....................................21
COUNTERFLOW MODEL INSTALLED HORIZONTALLY
WITH RIGHT SIDE DOWN .....................................22
COUNTERFLOW MODEL INSTALLED HORIZONTALLY
WITH LEFT SIDE DOWN ......................................22

2
G OODMAN WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES . I F YOU
INSTALL OR PERFORM SERVICE ON THIS UNIT , YOU ASSUME RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE WHICH MAY RESULT .
M
ANY JURISDICTIONS REQUIRE A LICENSE TO INSTALL OR SERVICE HEATING AND AIR CONDITIONING EQUIPMENT .
WARNING
ELECTRICAL CONNECTIONS .........................................23
WIRING HARNESS ..............................................23
115 VOLT LINE CONNECTIONS ..................................23
JUNCTION BOX RELOCATION .....................................24
24 VOLT THERMOSTAT WIRING..................................24
SINGLE-STAGE HEATING THERMOSTAT APPLICATION ................24
FOSSIL FUEL APPLICATIONS ......................................24
GAS SUPPLY AND PIPING ..........................................25
HIGH ALTITUDE DERATE ........................................25
PROPANE GAS CONVERSION .....................................25
GAS PIPING CONNECTIONS ......................................26
PROPANE GAS TANKS AND PIPING ...............................28
CIRCULATING AIR & FILTERS .......................................29
DUCT WORK -AIR FLOW .......................................29
CHECKING DUCT STATIC ........................................29
BOTTOM RETURN AIR OPENING [UPFLOW MODELS]...............30
FILTERS - READ THIS SECTION
BEFORE INSTALLING THE RETURN AIR DUCT WORK ..............31
HORIZONTAL INSTALLATIONS .....................................33
STARTUP PROCEDURE &ADJUSTMENT ..............................33
DRAIN TRAP PRIMING ..........................................33
FURNACE OPERATION ...........................................33
GAS SUPPLY PRESSURE MEASUREMENT ...........................34
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT ........34
GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY) ...........35
TEMPERATURE RISE ............................................36
CIRCULATOR BLOWER SPEEDS ...................................36
BLOWER HEAT OFF DELAY TIMINGS .............................37
NORMAL SEQUENCE OF OPERATION .................................37
POWER UP...................................................37
HEATING MODE ...............................................37
COOLING MODE ...............................................37
FAN ONLY MODE .............................................38
OPERATIONAL CHECKS ............................................38
SAFETY CIRCUIT DESCRIPTION ......................................38
INTEGRATED CONTROL MODULE .................................38
PRIMARY LIMIT.................................................38
AUXILIARY LIMIT ...............................................38
ROLLOUT LIMIT ...............................................38
PRESSURE SWITCHES ...........................................38
FLAME SENSOR ................................................38
TROUBLESHOOTING ...............................................38
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ...................38
DIAGNOSTIC CHART ............................................39
RESETTING FROM LOCKOUT .....................................39
MAINTENANCE ...................................................39
ANNUAL INSPECTION ...........................................39
FILTERS .......................................................40
BURNERS .....................................................40
INDUCED DRAFT AND CIRCULATOR BLOWERS ......................41
CONDENSATE TRAP AND DRAIN SYSTEM
(QUALIFIED SERVICER ONLY).................................41
FLAME SENSOR (QUALIFIED SERVICER ONLY).....................41
FLUE PASSAGES (QUALIFIED SERVICER ONLY).....................41
BEFORE LEAVING AN INSTALLATION .................................41
REPAIR AND REPLACEMENT PARTS ..................................41
TROUBLESHOOTING CHART ........................................42
TROUBLESHOOTING CHART ........................................43
AIRFLOW ........................................................44
*MSS92*** & *CSS92***A* ..................................44
*MSS96*** & *CSS96***A* ..................................45
WIRING DIAGRAM ................................................46
*MSS92*** & *CSS92***A* ..................................46
*MSS96*** & *CSS96***A* ..................................47
SPECIAL INSTRUCTIONS FOR PRODUCTS
INSTALLED IN THE STATE OF MASSACHUSETTS ......................48

3
T O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER
INSTALLATION , ADJUSTMENT , ALTERATION , SERVICE OR MAINTENANCE ,
REFER TO THIS MANUAL . F OR ADDITIONAL ASSISTANCE OR
INFORMATION , CONSULT A QUALIFIED INSTALLER , SERVICER AGENCY OR
THE GAS SUPPLIER .
WARNING
I F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED
EXACTLY , A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY
DAMAGE
, PERSONAL INJURY OR LOSS OF LIFE .
D O NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE .
D
O NOT TRY TO LIGHT ANY APPLIANCE .
D
O NOT TOUCH ANY ELECTRICAL SWITCH ; DO NOT USE ANY PHONE
IN YOUR BUILDING .
I
MMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR ’ S
PHONE . F OLLOW THE GAS SUPPLIER ’ S INSTRUCTIONS .
I
F YOU CANNOT REACH YOUR GAS SUPPLIER , CALL THE FIRE
DEPARTMENT .
I
NSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED
INSTALLER , SERVICE AGENCY OR THE GAS SUPPLIER .
WHAT TO DO IF YOU SMELL GAS:




WARNING
T HIS PRODUCT CONTAINS OR PRODUCES A CHEMICAL OR CHEMICALS
WHICH MAY CAUSE SERIOUS ILLNESS OR DEATH AND WHICH ARE
KNOWN TO THE S TATE OF C ALIFORNIA TO CAUSE CANCER , BIRTH
DEFECTS OR OTHER REPRODUCTIVE HARM .
WARNING
H EATING UNIT SHOULD NOT BE UTILIZED WITHOUT REASONABLE ,
ROUTINE , INSPECTION , MAINTENANCE AND SUPERVISION . I F THE
BUILDING IN WHICH ANY SUCH DEVICE IS LOCATED WILL BE VACANT ,
CARE SHOULD BE TAKEN THAT SUCH DEVICE IS ROUTINELY INSPECTED ,
MAINTAINED AND MONITORED . IN THE EVENT THAT THE BUILDING
MAYBE EXPOSED TO FREEZING TEMPERATURES AND WILL BE VACANT ,
ALL WATER - BEARING PIPES SHOULD BE DRAINED , THE BUILDING SHOULD
BE PROPERLY WINTERIZED , AND THE WATER SOURCE CLOSED . IN THE
EVENT THAT THE BUILDING MAY BE EXPOSED TO FREEZING
TEMPERATURES AND WILL BE VACANT , ANY HYDRONIC COIL UNITS
SHOULD BE DRAINED AS WELL AND , IN SUCH CASE , ALTERNATIVE HEAT
SOURCES SHOULD BE UTILIZED .
WARNING
T O PREVENT POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR
DEATH DUE TO ELECTRICAL SHOCK , THE FURNACE MUST BE LOCATED TO
PROTECT THE ELECTRICAL COMPONENTS FROM WATER .
WARNING
Drain trap must be primed at time of installation. Trap is
internallypartitioned; add waterto both inletports until wa-
ter appears at both sides of the outlet opening. Failure to
prime trap at time of installation may have a negative ef-
fect on combustion quality and pressure switch action.
S AFETY C ONSIDERATIONS
Adhere to the following warnings and cautions when install-
ing, adjusting, altering, servicing, or operating the furnace.
To ensure proper installation and operation, thoroughly read
this manual for specifics pertaining to the installation and
application of this product.
This furnace is manufactured for use with natural gas. It
may be field converted to operate on L.P. gas by using the
appropriate L.P. conversion kit listed in the PROPANE GAS/
HIGHALTITUDE INSTALLATIONS section of this manual
Install this furnace only in a location and position as speci-
fied in LOCATION REQUIREMENTS & CONSIDERATIONS sec-
tion and INSTALLATION POSITIONS section of this manual.
Provide adequate combustion and ventilation air to the fur-
nace as specified in COMBUSTION & VENTILATION AIR RE-
QUIREMENTS section of this manual.
Combustion products must be discharged to the outdoors.
Connect this furnace to an approved vent system only, as
specified in VENT/FLUE PIPE & COMBUSTIONAIR PIPE sec-
tion of this manual.
Never test for gas leaks with an open flame. Use a commer-
ciallyavailable soap solutionmade specifically forthe detec-
tion of leaks to check all connections, as specified in GAS
SUPPLY AND PIPING section of this manual.
Always install a furnace to operate within the furnace’s in-
tended temperature-rise range with a duct system which has
external static pressure within the allowable range, as speci-
fied on the furnace rating plate and OPERATIONAL CHECKS
section of these instructions.
When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space contain-
ingthefurnace, the return air shallalso be handled by duct(s)
sealed to the furnace casing and terminating outside the
space containing the furnace.
A gas-fired furnace for installation in a residential garage
must be installed as specified in the LOCATION REQUIRE-
MENTSAND CONSIDERATIONS section of this manual.
This furnace may be used as a construction site heater only
if certain conditions are met. These conditions are listed in
the PRODUCTAPPLICATION section of this manual.
FROZEN AND BURST WATER PIPE HAZARD
F
AILURE TO PROTECT AGAINST THE RISK OF FREEZING MAY RESULT IN
PROPERTY DAMAGE .
S
PECIAL PRECAUTIONS MUST BE MADE IF INSTALLING FURNACE IN AN
AREA WHICH MAY DROP BELOW FREEZING . T HIS CAN CAUSE IMPROPER
OPERATION OR DAMAGE TO EQUIPMENT . I F THE FURNACE
ENVIRONMENT HAS THE POTENTIAL OF FREEZING , THE DRAIN TRAP AND
DRAIN LINE MUST BE PROTECTED . T HE USE OF ACCESSORY DRAIN TRAP
HEATERS , ELECTRIC HEAT TAPE AND / OR RV ANTIFREEZE IS
RECOMMENDED FOR THESE INSTALLATIONS .
CAUTION

4
B10259-216
CO can cause serious illness including permanent brain
damageordeath.
Advertencia especialparala instalaciónde calentadores ó manejadoras
de aire en áreas cerradas como estacionamientos ó cuartos de servicio.
B10259-216
El monóxido de carbono puede causar enfermedades severas
como daño cerebral permanente ó muerte.
Las emisiones de monóxido de carbono pueden circular a través
del aparato cuando se opera en cualquier modo.
B10259-216
RISQUE D'EMPOISONNEMENT AU MONOXYDEDECARBONE
Le monoxyde de
des carbone peut causerdes maladies graves telles que dommages permanents au cerveau et meme la mort.
Cette ventilation est nécessaire pour éviter le danger d'intoxication
au CO pouvant survenir si un appareil produisant du monoxyde
de carbone continue de fonctionner au sein de la zone confinée.
P OSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , EXPLOSION , SMOKE , SOOT , CONDENSATION , ELECTRICAL SHOCK
OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION ,
REPAIR OPERATION , OR MAINTENANCE OF THIS PRODUCT .
WARNING
S HOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF ,
TURN OFF THE MANUAL GAS SHUTOFF VALVE EXTERNAL TO THE
FURNACE BEFORE TURNING OFF THE ELECTRICAL SUPPLY .
WARNING
SHIPPINGINSPECTION
All units are securely packed in shipping containers tested accord-
ing to International Safe Transit Association specifications. The
cartonmustbe checkeduponarrivalforexternal damage. If dam-
age is found, a request for inspection by carrier’s agent must be
madein writingimmediately.
Thefurnacemustbecarefullyinspectedonarrivalfordamageand
boltsor screwswhichmayhavecomelooseintransit. Intheevent
ofdamage the consignee should:
1. Make a notation on delivery receipt of any visible damage to
shipmentorcontainer.
2. Notifycarrierpromptlyand requestaninspection.
3. With concealed damage, carrier must be notified as soon as
possible - preferably within five days.
4. Filetheclaimwiththe followingsupportdocumentswithin aninemonthstatuteof limitations.
• Originalorcertifiedcopy of the Bill of Lading, orindemnitybond.
• Originalpaidfreightbillorindemnityinlieuthereof.
• Originalor certified copy of the invoice, showing trade and other discounts or reductions.
• Copy of the inspection report issued by carrier’s representative at the time damage is reported to carrier.
Thecarrieris responsibleformakingprompt inspectionofdamageand forathoroughinvestigation ofeachclaim.The distributoror
manufacturerwillnotacceptclaimsfrom dealersfortransportationdamage.
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
NOTE: Discharge your body’s static electricity before touching unit. An electrostatic discharge can adversely affect electrical
components.
Use the following precautions during furnace installation and servicing to protect the integrated control module from damage. By
putting the furnace, the control, and the person at the same electrostatic potential, these steps will help avoid exposing the
integratedcontrolmodule toelectrostaticdischarge. Thisprocedure isapplicabletoboth installedandnon-installed(ungrounded)
furnaces.
1. Disconnectallpowertothefurnace. Donottouchtheintegratedcontrolmoduleoranywireconnectedto thecontrolprior to
dischargingyourbody’s electrostatic charge to ground.
2. Firmly touch a clean, unpainted, metal surface of the furnaces near the control. Any tools held in a person’s hand during
groundingwill bedischarged.

5
3. Serviceintegratedcontrolmoduleorconnectingwiringfollowingthedischargeprocessin step2. Usecaution nottorecharge
yourbodywithstaticelectricity;(i.e., donotmoveor shuffleyourfeet,do nottouchungroundedobjects,etc.). Ifyoucome
incontactwith anungroundedobject,repeat step2beforetouching controlorwires.
4. Discharge your body to ground before removing a new control from its container. Follow steps 1 through 3 if installing the
controlona furnace. Returnanyold ornewcontrolsto theircontainersbeforetouchingany ungroundedobject.
TOTHE INSTALLER
Before installing this unit, please read this manual thoroughly to
familiarizeyourselfwithspecificitemswhichmustbeadhered to,
including but not limited to: unit maximum external static pres-
sure, gas pressures, BTU input rating, proper electrical connec-
tions,circulatingairtemperaturerise,minimumormaximumCFM,
andmotorspeedconnections.
P RODUCT A PPLICATION
Thisfurnaceisprimarilydesignedfor residentialhome-heatingapplications. ItisNOTdesignedor certifiedforusein mobilehomes,
trailersor recreational vehicles. Neither is it designed orcertified for outdoor applications. The furnace must be installed indoors
(i.e., attic space, crawl space, or garage area provided the garage area is enclosed with an operating door).
Thisfurnacecan beusedinthe followingnon-industrialcommercialapplications:
Schools, Office buildings, Churches, Retail stores, Nursing homes, Hotels/motels, Common or office areas
Insuchapplications, thefurnacemustbe installedwiththefollowingstipulations:
• Itmustbe installedpertheinstallationinstructions providedandperlocaland nationalcodes.
• It must be installed indoors in a building constructed on site.
• It must be part of a ducted system and not used in a free air delivery application.
• It must not be used as a “make-up” air unit.
• It must be installed as a two-pipe systems for combustion air.
• AllotherwarrantyexclusionsandrestrictionsapplyThisfurnaceisanETLdual-certifiedapplianceandisappropriateforuse
with natural or propane gas (NOTE: If using propane, a propane conversion kit is required).
Dual certification means that the combustion air inlet pipe is optional and the furnace can be vented as a:
Non-directvent (single pipe) central forced airfurnace in which combustion air istaken from the installation areaorfrom
airducted from the outside or,
Directvent(dualpipe)centralforcedairfurnace inwhichallcombustionairsupplieddirectlytothefurnaceburnersthrough
a special air intake system outlined in these instructions.
This furnace may be used as a construction site heater ONLY if all of the following conditions are met:
• Theventsystem is permanentlyinstalledpertheseinstallation instructions.
• Aroomthermostatisusedtocontrolthefurnace. Fixed jumpers that provide continuous heating CANNOT be usedandcan
causelongtermequipment damage. Bi-metal thermostats, or any thermostat affected by vibration, must not be used
during construction.
• Return air ducts areprovided and sealed to the furnace.
• A return air temperature range between 60ºF (16ºC) and 80ºF (27ºC) is maintained.
• Airfiltersare installedinthesystem andreplaced daily during construction andupon completionof construction.
• The input rate and temperature rise are set per the furnace rating plate.
• The furnace must be installed as a two pipe system, using 100% outside air for combustion during construction.
• The furnace heat exchanger, components, duct system, air filters and evaporator coils are thoroughly cleaned
following final construction clean up by a qualified person.
• All furnace operating conditions (including ignition, input rate, temperature rise and venting) are verified according to
theseinstallationinstructions.
• Furnace doors must be in place on the furnace while the furnace is operating in any mode.
• Damage or repairs due to failure to comply with these requirements are not covered under the warranty.
NOTE: TheCommonwealthofMassachusettsrequiresthatthefollowingadditionalrequirements must also be met:
• Gas furnaces must be installed by a licensed plumber or gas fitter.
• AT-handle gas cock must be used.
T O PREVENT PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , DO NOT INSTALL THIS FURNACE IN A MOBILE HOME , TRAILER , OR
RECREATIONAL VEHICLE .
WARNING

6
• If the unit is to be installed in an attic, the passageway to and the service area around the unit must have flooring.
To ensure proper furnace operation, install, operate and maintain the furnace in accordance with these installation and
operationinstructions,all local buildingcodes and ordinances. Intheirabsence,followthelatesteditionoftheNational FuelGas
Code (NFPA54/ANSI Z223.1), and/or CAN/CSAB149 Installation Codes, local plumbing or waste water codes, and other applicable
codes. Acopy of the National Fuel Gas Code (NFPA54/ANSI Z223.1) can be obtained from any of the following:
American National Standards Institute NationalFireProtectionAssociation CSA International
25 West 43rd Street, 4th Floor 1BatterymarchPark 8501EastPleasantValley
New York, NY 10036 Quincy, MA 02169-7471 Independence,OH44131
Therated heatingcapacity ofthe furnaceshould begreaterthan orequal tothe totalheat lossofthe areatobe heated. The total heat
lossshouldbecalculatedbyanapprovedmethodorinaccordancewith“ASHRAEGuide”or“ManualJ-LoadCalculations”publishedby
theAir Conditioning Contractors ofAmerica.
Acopyof the CAN/CSA B149 Installation Codescanalso be obtained from:
CSAInternational • 178 Rexdale Boulevard • Etobicoke, Ontario, Canada M9W 1R3
L OCATION R EQUIREMENTS &C ONSIDERATIONS
Follow the instructions listed below and the guidelines provided in the Combustion and Ventilation Air Requirements section when
selectinga furnacelocation.
T O PREVENT POSSIBLE EQUIPMENT DAMAGE , PROPERTY DAMAGE ,
PERSONAL INJURY OR DEATH , THE FOLLOWING BULLET POINTS MUST BE
OBSERVED WHEN INSTALLING THIS UNIT .
WARNING
P OSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , EXPLOSION , SMOKE , SOOT , CONDENSATION , ELECTRICAL SHOCK
OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION ,
REPAIR OPERATION , OR MAINTENANCE OF THIS PRODUCT .
WARNING
• Centrally locatethefurnacewithrespecttotheproposed or existing air distributionsystem.
• Ensure the temperature of the return air entering the furnace is between 55°F and 100°F when the furnace is heating.
• Provide provisionsforventing combustionproductsoutdoors throughaproperventingsystem. Specialconsiderationshould
begiventovent/fluepiperoutingandcombustionairintakepipewhenapplicable. Referto Vent/FluePipeandCombustion
AirPipe -TerminationLocationsforappropriateterminationlocationsandtodetermineifthepipingsystemfromfurnaceto
terminationcan be accomplished within theguidelines given. NOTE: The length of flueand/or combustion air piping can
bea limiting factor inthe location of thefurnace.
• Locate the furnace so condensate flows downwards to the drain. Do not locate the furnace or its condensate drainage
system in any area subject to below freezing temperatures without proper freeze protection. Refer to Condensate Drain
Lines and Trap for further details.
• Ensure adequate combustion air is available for the furnace. Improper or insufficient combustion air can expose building
occupants to gas combustion products that could include carbon monoxide. Refer to Combustion and Ventilation Air
Requirements.
• Setthefurnaceonalevelfloortoenablepropercondensatedrainage. Ifthefloorbecomeswetordampattimes,placethe
furnace above the floor on a concrete base sized approximately 1-1/2" larger than the base of the furnace. Refer to the
HorizontalApplicationsandConsiderationsforlevelingofhorizontalfurnaces.
• Ensure upflow or horizontal furnaces are not installed directly on carpeting, or any other combustible material. The only
combustiblematerialallowediswood.
• Aspecialaccessorysubbasemustbeusedforuprightcounterflow unitinstallationsoveranycombustiblematerial(including
wood). Refertosubbaseinstructionsforinstallationdetails. (NOTE:Asubbasewill notberequiredifanairconditioningcoil
islocatedbeneaththefurnacebetweenthesupplyair openingandthecombustiblefloor.
• Exposuretocontaminatedcombustionair willresultinsafetyandperformance-relatedproblems. Donotinstallthefurnace
wherethecombustion air is exposed to thefollowingsubstances:
permanentwave solutions chlorinatedwaxes orcleaners chlorine-based
carbontetrachloride watersofteningchemicals swimmingpool chemicals
deicingsaltsor chemicals halogentyperefrigerants printing inks
cleaningsolutions(suchasperchloroethylene)

7
paint removers varnishes hydrochloricacid
cementsandglues antistaticfabric softenersforclothesdryers
masonry acid washing materials
• Sealoffanon-directventfurnaceifitisinstallednearanareafrequentlycontaminatedbyanyoftheabovesubstances. This
protectsthenon-directventfurnacefrom airbornecontaminants. Toensurethattheenclosednon-direct vent furnace has
anadequate supplyofcombustionair,ventfromanearbyuncontaminatedroomorfromoutdoors. Refertothe Combustion
andVentilationAirRequirementsfordetails.
• Ifthe furnace is used in connection with a cooling coil unit, install the furnace upstream or in parallel with the cooling coil
unit. Prematureheatexchangerfailure willresultifthecooling unitisplacedaheadof thefurnace.
For vertical (upflow or downflow) applications, the minimum cooling coil width shall not be less than furnace width
minus 1”. Additionally, a coil installed above an upflow furnace or under a counterflow furnace may be the same
width as the furnace or may be one size larger than the furnace. Example: a “C” width coil may be installed with
a “B” width furnace.
For upflow applications, the front of the coil and furnace must face the same direction.
• Ifthefurnaceisinstalledinaresidentialgarage,positionthefurnace sothattheburnersandignitionsourcearelocatednot
less than 18 inches (457 mm) above the floor. Protect the furnace from physical damage by vehicles.
• If the furnace is installed horizontally, ensure the access doors are not on the “up/top” or “down/bottom” side of the
furnace.
• Do not connect this furnace to a chimney flue that serves a separate appliance designed to burn solid fuel.
• On Counterflow Installations, the air conditioning coil must be downstream on the supply (positive) side of the
furnace heat exchanger.
•Counterflow Installation over a noncombustible floor. Before setting the furnace over the plenum opening, ensure
the surface around the opening is smooth and level.Atight seal should be made between the furnace base and floor
by using a silicone rubber caulking compound or cement grout.
•CounterflowInstallationoveracombustiblefloor.Ifinstallationoveracombustiblefloorbecomesnecessary,useanaccessory
subbase(seeSpecificationSheetapplicableforyourmodelfordetails.) Aspecialaccessorysubbasemustbeusedforupright
counterflowunit installations over any combustible material includingwood. Refer to subbase instructionsfor installation
details.Followtheinstructionswiththesubbase forproperinstallation.Donotinstallthefurnacedirectlyoncarpeting,tile,
orothercombustible materialotherthanwoodflooring.(NOTE:Thesubbase willnotberequiredif anairconditioningcoil
isinstalledbetween thesupplyairopeningon thefurnaceandthefloor.)
CLEARANCES AND ACCESSIBILITY
NOTES:
• For servicing or cleaning, a 24” front clearance is
required.
• Unit connections (electrical, flue and drain) may
necessitate greater clearances than the minimum
clearances listed above.
• In all cases, accessibility clearance must take
precedence over clearances from the enclosure
where accessibility clearances are greater.
NOTES:
• For servicing or cleaning, a 24” front clearance is
required.
• Unit connections (electrical, flue and drain) may
necessitate greater clearances than the minimum
clearances listed above.
• In all cases, accessibility clearance must take
precedenceoverclearancesfrom theenclosurewhere
accessibility clearances are greater.
Installationsmustadhere totheclearancestocombustible materialstowhichthisfurnace hasbeendesigncertified. Theminimum
clearanceinformationforthisfurnaceis providedontheunit’sclearancelabel. Theseclearances mustbepermanentlymaintained.
Clearances must also accommodate an installation’s gas, electrical, and drain trap and drain line connections. If the alternate
combustionairintakeorvent/flueconnections areusedadditionalclearance mustbeprovidedtoaccommodatetheseconnections.
Referto Vent/FluePipeandCombustionAirPipefordetails.
POSITION* SIDES REAR FRONT BOTTOM FLUE TOP
Upflow 0" 0" 3" C 0" 1"
Horizontal 6" 0" 3" C 0" 6"
C = If placed on combustible floor, floor MUST be wood only.
*MSS[92 & 96]* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
POSITION* SIDES REAR FRONT BOTTOM FLUE TOP
Counterflow0"0"3"NC0"1"
Horizontal 6" 0" 3" C 0" 6"
C = If placed on combustible floor, floor MUST be wood only.
NC = For installation on non-combustible floors only. Acombustible subbase
must
b
e use
d
f
or
i
nsta
ll
at
i
ons on com
b
ust
ibl
e
fl
oor
i
ng.
*CSS[92 & 96]* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)

8
NOTE: Inadditionto therequiredclearancestocombustible materials,aminimumof 24inchesserviceclearancemust beavailable
in front of the unit. TOP
BOTTOM
SIDE SIDE SIDE
TOP
BOTTOM
Upflow Counterflow Horizontal
Figure 1
A furnaceinstalledin a confined space (i.e.,acloset or utility room) musthavetwo ventilation openings with atotalminimumfree
area of 0.25 square inches per 1,000 BTU/hr of furnace input rating. Refer to Specification Sheet applicable to your model for
minimumclearancestocombustiblesurfaces. Oneoftheventilationopeningsmustbewithin 12inchesofthetop;theotheropening
must be within 12 inches of the bottom of the confined space. In a typical construction, the clearance between the door and door
frame is usually adequate to satisfy this ventilation requirement.
EXISTING FURNACE REMOVAL
NOTE: Whenanexistingfurnaceisremovedfromaventingsystem serving other appliances, the venting system may be too large to
properlyvent theremainingattachedappliances.
The following vent testing procedure is reproduced from the American National Standard/National Standard of Canada for Gas-
Fired Central Furnaces ANSI Z21.47, CSA-2.3 latest edition Section 1.23.1.
The following steps shall be followed with each appliance connected to the venting system placed in operation, while any 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 by the National Fuel Gas Code,ANSI Z223.1
or the Natural Gas and Propane Installation Code, CSA B149.1-05 and these instructions. Determine that there is no
blockage or restriction, leakage, corrosion and other deficiencies 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 fireplace 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 shall operate at maximum speed. Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance being inspected in operation.Adjust thermostat so appliance shall
operatecontinuously.
7. Test for spillage from draft hood appliances at the draft hood relief opening after 5 minutes of main burner operation.
Use the flame 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 CodeANSI Z223.1/NFPA54 and/or National Gas and Propane Installation Code CSAB149.1-05.
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, fireplace dampers and any other gas burning appliance to their
previous conditions of use.

9
If resizing is required on any portion of the venting system, use the appropriate table inAppendix G in the latest edition of the
National Fuel Gas CodeANSI Z223.1 and/or CSAB149.1-05 Installation Codes.
THERMOSTAT LOCATION
The thermostatshould beplacedapproximately five feetfrom the flooron avibration-free, inside wallin an areahaving good air
circulation. Donotinstallthethermostatwhereitmaybe influenced by any of the following:
• Drafts, or dead spots behind doors, in corners, or under cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
• Light fixtures or other appliances.
• Radiantheatfromafireplace.
• Concealedhotorcoldwaterpipes,orchimneys.
• Unconditionedareasbehindthethermostat, such as an outside wall.
Consulttheinstructions packaged with the thermostatformounting instructions and further precautions.
C OMBUSTION & V ENTILATION A IR R EQUIREMENTS
Improvedconstructionand additionalinsulationinbuildings have
reducedheatlossbyreducingairinfiltrationand escape around
doorsand windows. Thesechangeshave helpedinreducing heat-
ing/coolingcostsbuthavecreated a problem supplying combus-
tionandventilationair for gas firedandotherfuelburningappli-
ances. Appliancesthatpullair out of the house (clothes dryers,
exhaust fans, fireplaces, etc.) increase the problem by starving appliances for air.
House depressurization can cause back drafting or improper combustion of gas-fired appliances, thereby exposing building
occupantstogascombustionproductsthatcouldincludecarbonmonoxide.
Ifthisfurnaceistobe installed in the same space with other gas appliances,suchasawaterheater, ensure there is an adequate
supplyofcombustionandventilationairfortheotherappliances. Refer to the latest edition of the National Fuel Gas Code NFPA
54/ANSIZ223.1 or CAN/CSA B1491-05 Installation Codes or applicableprovisions of the local buildingcodes for determining the
combustionairrequirementsfortheappliances.
Mosthomeswillrequireoutsideairbesuppliedtothefurnaceareabymeansofventilationgrillesorductsconnectingdirectly to
the outdoors or spaces open to the outdoors such as attics or crawl spaces.
I NSTALLATION P OSITIONS
Figure 2A Figure 2B Figure 2C
Recommended Installation Positions
This furnacemay beinstalledinanuprightpositionorhorizontaloneithertheleft orright sidepanel. Donotinstallthis furnace
on its back. For upright upflow furnaces, return air ductwork may be attached to the side panel(s) and/or basepan. For
horizontal upflow furnaces, return air ductwork must be attached to the basepan. For both upright or horizontal counterflow
furnaces,returnductworkmustbeattachedto the basepan (top end of theblowercompartment). NOTE: Ductworkmustnever
T O AVOID PROPERTY DAMAGE , PERSONAL INJURY OR DEATH ,
SUFFICIENT FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF
FLUE GASES MUST BE SUPPLIED . M OST HOMES REQUIRE OUTSIDE AIR BE
SUPPLIED INTO THE FURNACE AREA .
WARNING

10
beattachedto thebackofthefurnace. Contact yourdistributorforproperairflow requirementsandnumberofrequired ductwork
connections. Refer to “RecommendedInstallationPositions”figureforappropriateinstallationpositions,ductworkconnections,
andresultingairflowarrangements.
H ORIZONTAL A PPLICATIONS & C ONSIDERATIONS
When installing a furnace horizontally, additional consideration
mustbe given to the following:
FURNACESUSPENSION
Ifsuspending thefurnace fromrafters orjoists, use3/8" threaded
rodand 2”x2”x1/8”angleironasshowninthefollowingdiagram.
The length of rod will depend on the application and the clear-
ancesnecessary.
If the furnace is installed in a crawl space it must be suspended
fromthefloorjoistorsupported byaconcretepad. Never install
thefurnaceonthegroundor allow it to be exposed to water.
FRONT COVER PRESSURE SWITCH TUBE LOCATION
When an upflow model is installed horizontally with left side
downoracounterflowmodelisinstalledhorizontallywithright
side down, the front cover pressure switch tube must be re-located to the lower port of the collector box cover.
1. Remove tube from front cover pressure switch and collector box cover.
2. Remove rubber plug from bottom collector box port and install on top collector box port.
3. Locate 24” x 1/4” tube in parts bag.
4. Install one end on front cover pressure switch.
5. Route tube to lower port on collector box cover and cut off excess tubing.
DRAIN TRAP AND LINES
Inhorizontalapplicationsthecondensatedraintrapissecuredtothefurnacesidepanel,suspendingitbelowthefurnace. Aminimum
clearanceof 5.5”below thefurnacemustbeprovidedforthedraintrap. Additionally,theappropriate downwardpipingslopemust
bemaintained fromthedraintraptothedrainlocation.Referto CondensateDrain Trap andLinesfor furtherdetails.Ifthedraintrap
anddrainlinewillbeexposedtotemperaturesnearorbelowfreezing,adequatemeasuresmustbetakentopreventcondensatefrom
freezing.
LEVELING
Leveling ensures proper condensate drainage from the heat exchanger. For proper flue pipe drainage, the furnace must be level
lengthwise from end to end. The furnace should have a slight tilt from back to front with the access doors downhill from the
back panel approximately 1/2 to 3/4 inches. Theslight tilt allows the heat exchanger condensate, generated in the recuperator
coil,toflowforwardtotherecuperatorcoilfront cover.
ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS
Thisfurnacehasprovisionsallowingforelectricalandgaslineconnectionsthrougheithersidepanel. Inhorizontal applicationsthe
connectionscanbemadeeitherthroughthe“top”or“bottom”ofthefurnace.
DRAIN PAN
Adrain panmustbeprovidedifthefurnaceisinstalledaboveaconditionedarea. Thedrainpanmustcovertheentire areaunderthe
furnace(andairconditioningcoilif applicable).
FREEZE PROTECTION
Refer to HorizontalApplications andConditions - Drain Trap and Lines.
P ROPANE G AS /H IGH A LTITUDE I NSTALLATIONS
This furnaceis shippedfromthefactory configured fornatural gas atstandard altitude. Propane gas installationsrequire an orifice
andspringchangetocompensateforthe energycontentdifferencebetween naturalandpropanegas.
2" 2" 3/8" ANGLE IRON
(3 PLACES )
XX
Figure 3

11
Highaltitude installationsmayrequirebothapressureswitchand
an orifice/spring change. These changes are necessary to com-
pensate for the natural reduction in the density of both the gas
fuelandthecombustionair at higher altitude.
For installations above 7000 feet, please refer to the furnace
Specification Sheets for required kit(s).
Contact the distributor for a tabular listing of appropriate
manufacturer’skitsforpropanegasand/orhighaltitudeinstalla-
tions. The indicated kits must be used to insure safe and proper
furnaceoperation. Allconversionsmustbeperformedbyaquali-
fiedinstaller,orserviceagency.
V ENT /F LUE P IPE & C OMBUSTION A IR P IPE
A condensing gas furnace achieves its high level of efficiency by
extractingalmost alloftheheatfromtheproductsofcombustion
and cooling them to the point where condensation takes place.
Becauseoftherelativelylowfluegastemperatureandwatercon-
densation requirements, PVC pipe is used as venting material.
In addition to PVC and ABS pipe and fittings, Innoflue®by
Centrotherm Eco Systems and PolyPro®by M&G Duravent are
also approved vent and combustion air materials for installa-
tions in the U.S.A. and Canada. Manufacturers Installation
instructions for these products must be followed. These prod-
ucts have specific instructions for installing, joining and ter-
minating. Do not mix materials or components of one manu-
facturer with materials or components of another manufac-
turer.
All furnaces are built with 2" vent / intake pipe and connec-
tors. For furnaces requiring installation of 3" pipe, the tran-
sition from 2" to 3" should be done as close to the furnace as
practicallypossible.
This furnace must not be connected to Type B, BW, or L vent or
ventconnector,andmustnotbeventedintoanyportionofafactorybuiltormasonrychimneyexceptwhenusedasapathwayforPVC
asdescribedlaterinthissection. Nevercommonventthisappliancewithanotherapplianceoruseaventwhichisusedbyasolidfuel
appliance. Donotuse commerciallyavailable“nohub connectors”otherthanthose shippedwiththisproduct.
It is the responsibility of the installer to follow the manufacturers’ recommendations and to verify that all vent/flue piping and
connectorsarecompatiblewithfurnaceflueproducts. Additionally,itistheresponsibilityoftheinstallertoensurethatallpipingand
connections possess adequate structural integrity and support to prevent flue pipe separation, shifting, or sagging during furnace
operation.
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT
Thisfurnace isdualcertifiedandmaybeinstalledasanon-directvent(singlepipe)ordirectvent(dualpipe)appliance. Anon-direct
vent installation requires only a vent/fluepipe, while a directventinstallationrequires both a vent/flue pipe and acombustionair
intakepipe. Refertotheappropriatesectionfordetailsconcerningpipingsize, length,numberofelbows,furnaceconnections,and
terminations.
MATERIALS AND JOINING METHODS
Two-three-inch nominal diameter PVC Schedule 40 pipe meet-
ing ASTM D1785, PVC primer meeting ASTM F656, and PVC
solvent cement meeting ASTM D2564 specifications must be
used. Fittings must be DWV type fittings meetingASTM D2665
andASTM D3311. Carefully follow the manufacturer’s instruc-
tions for cutting, cleaning, and solvent cementing of PVC.
WARNING
P OSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH MAY
OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED . T HE
APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER
FURNACE OPERATION . A LL CONVERSIONS MUST BE PERFORMED BY A
QUALIFIED INSTALLER OR SERVICE AGENCY .
T O AVOID BODILY INJURY , FIRE OR EXPLOSION , SOLVENT CEMENTS
MUST BE KEPT AWAY FROM ALL IGNITION SOURCES ( I . E ., SPARKS , OPEN
FLAMES , AND EXCESSIVE HEAT ) AS THEY ARE COMBUSTIBLE LIQUIDS .
A
VOID BREATHING CEMENT VAPORS OR CONTACT WITH SKIN AND / OR
EYES .
WARNING
F AILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN BODILY
INJURY OR DEATH . C AREFULLY READ AND FOLLOW ALL INSTRUCTIONS
GIVEN IN THIS SECTION .
WARNING
U PON COMPLETION OF THE FURNACE INSTALLATION , CAREFULLY
INSPECT THE ENTIRE FLUE SYSTEM BOTH INSIDE AND OUTSIDE OF THE
FURNACE TO ASSURE IT IS PROPERLY SEALED . L EAKS IN THE FLUE
SYSTEM CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH DUE TO
EXPOSURE TO FLUE PRODUCTS , INCLUDING CARBON MONOXIDE .
WARNING
High
Stage Low Stage
Natural None #45 3.5" w.c. 1.9" w.c. None
Propane LPM-07*11.25mm 10.0" w.c. 6.0" w.c. None
Gas Altitude Kit Orifice ManifoldPressure Pressure Switch
Change
0-7000
1LPM-07* supports both Honeywell and White-Rodgers 1-stagevalves
NOTE: InCanada, gas furnaces are onlycertified to 4500 feet.

12
The use of Schedule 40 PVC cellular core DWV meeting ASTM F891-1 or ABS cellular core (Foam Core) plastic pipe is also
acceptable as a flue/vent and intake pipe material. PVC primer meetingASTM F656 and PVC solvent cement meetingASTM
D2564 specifications must be used. Fittings must be DWV type fittings meeting ASTM D2665 and ASTM D3311. Carefully
follow the manufactures instructions for cutting, cleaning and solvent cementing of PVC.
For Canadian installations; all PVC pipe, fittings and joining materials must be UL S636 listed.
As an alternative to PVC pipe, primer, solvent cement, and fittings, ABS materials which are in compliance with the following
specifications may be used. Two-or-three-inch ABS Schedule 40 pipe must meetASTM D1527 and, if used in Canada, must be CSA
listed. SolventcementforABStoABSjointsmustmeetASTMD2235and, ifusedinCanada,must beCSAlisted. Thesolventcement
forthePVC toABS transitionjointmustmeetASTMD3138. Fittingsmust beDWVtypefittings meetingASTMD2661andASTMD3311
and, if used in Canada, must be CSA listed. Carefully follow the manufacturers’ instructions for cutting, cleaning, and solvent
cementingPVCand/orABS.
All90°elbowsmustbemedium radius(1/4bendDWV) orlongradius(Longsweep1/4 bendDWV) typesconformingtoASTMD3311.
A medium radius (1/4 bend DWV) elbow measures 3 1/16” minimum from the plane of one opening to the center line of the other
opening for 2” diameter pipe, and 4 9/16” minimum for 3” pipe.
PROPER VENT/FLUE AND COMBUSTION AIR PIPING PRACTICES
Adhere to these instructions to ensure safe and proper furnace performance. The length, diameter, and number of elbows of the
vent/flue pipe and combustion air pipe (when applicable) affects the performance of the furnace and must be carefully sized. All
pipingmustbe installedinaccordancewithlocalcodesandtheseinstructions.
Some models require the use of 3” pipe. Do not transition from a 2” to 3” pipe in a horizontal section of pipe as this may
create a water trap.
PREFERRED
TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
ACCEPTABLE
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAPAND
RESTRICTS FLUE
GASES
Figure 4 Figure 5 Figure 6
Piping must be adequately secured and supported to prohibit sagging, joint separation, and/or detachment from the furnace.
Horizontalrunsofvent/fluepipingmustbesupportedeverythreetofivefeetandmustmaintaina1/4inchperfootdownwardslope,
back towards the furnace, to properly return condensate to the furnace’s drain system. Allowances should be made for minor
expansionandcontractionduetotemperaturevariations. Forthisreason,particularcaremustbetakentosecurepipingwhenalong
run is followed by a short offset of less than 40 inches.
Precautionsshouldbetakentopreventcondensatefromfreezinginsidethevent/fluepipeand/oratthevent/fluepipetermination.
All vent/flue piping exposed to freezing temperatures below 35°F for extended periods of time must be insulated with 1/2” thick
closedcellfoam. Alsoallvent/fluepipingexposedoutdoorsinexcessoftheterminationsshowninthismanual(orin unheatedareas)
must be insulated with 1/2” thick closed cell foam. Inspect piping for leaks prior to installing insulation.
TERMINATION LOCATIONS
NOTE: Refer toLocationRequirementsandConsiderationsforcombustionaircontaminant restrictions.
Thefollowing bulletsanddiagramdescribetherestrictionsconcerningtheappropriatelocationof vent/fluepipeandcombustionair
intakepipe(whenapplicable)terminations. RefertoNon-DirectVent (SinglePipe)Piping andDirectVent(DualPipe)Pipinglocated
in this section for specific details on termination construction.
• Allterminations(flueand/orintake)mustbelocatedatleast 12 inches above ground level or the anticipated snow level.
• Vent terminations (non-direct and direct vent) must terminate at least 3 feet above any forced air inlet located within 10
feet.
NOTE: This provision does not apply to the combustion air intake termination of a direct vent application.

13
• The vent termination of a non-direct vent application must
terminateatleast4feetbelow,4feethorizontallyfrom,or1
foot above any door, window, or gravity air inlet into any
building.
• The vent termination of a direct vent application must
terminateatleast12inchesfromany openingthroughwhich
fluegases may enter a building (door,window, or gravityair
inlet).
• The vent termination of vent pipe run vertically through a
roofmustterminateatleast12inches abovetheroofline(or
the anticipated snow level) and be at least 12 inches from
anyvertical wall(includinganyanticipatedsnowbuildup).
• Avent terminationshallnotterminateoverpublicwalkways
or over an area where condensate or vapor could create a
nuisanceorhazard orcouldbedetrimentaltotheoperation
ofregulators,reliefvalves,orotherequipment.
• The combustion air intake termination of a direct vent
applicationshouldnotterminateinanareawhichisfrequently
dustyordirty.
NOTE: InCanada, the Canadian Fuel Gas Code takes precedence over thepreceding termination restrictions.
CANADIAN VENTING REQUIREMENTS
InCanada, ventingmustconformtotherequirementsofthecurrentCAN/CSA-B149.1-05InstallationCode.Useonly CSA-listed,ULC-
S636compliant two-orthree-inch diameterPVCorABSpipe,solventcement,andfittingsthroughout. Thecertifiedpipingshouldbe
clearly marked with the ULC Std “S636” on the pipe and fittings. Carefully follow the pipe manufacturers’ instructions for cutting,
cleaning,andsolvent cementingPVCand/orABS.
Theventcanberunthrough anexistingunusedchimneyprovidedthespace betweentheventpipeandthechimney isinsulatedand
closedwitha weather-tight, corrosion-resistant flashing.
STANDARD FURNACE CONNECTIONS
It is the responsibility of the installer to ensure that the piping connections to the furnace are secure, airtight, and adequately
supported.
Vent/FluePipe
The vent pipe outlet is sized to accept 2” pipe. Secure vent/flue pipe directly into the
furnace fitting with the appropriate glue. Alternately, a small section of 2" pipe may be
glued in the furnace socket and a rubber coupling installed to allow removal for future
service. CombustionAir and Vent piping should be routed in a manner to avoid contact
with refrigerant lines, metering devices, condensate drain lines, etc. If necessary,
clearances may be increased by creating an offset using two 45 degree elbows (Figure
8A). This joint can be rotated on the fitting to establish maximum clearance between
refrigerant lines, metering devices, and condensate drain lines, etc. This joint is the
equivalent of one 90 deg. elbow when considering elbow count.
NOTE: For non-direct vent installations, a minimum of one 90° elbow should be in-
stalled on the combustion air intake coupling to guard against inadvertent blockage.
DIRECTVENTINSTALLATIONS
On upflow units secure the combustion air intake pipe to the air intake coupling by using a take apart rubber coupling supplied
with the furnace or a plastic coupling. Also, the intake coupling may be inverted to allow the intake pipe to be glued directly
to it. After inverting the coupling, secure it to the furnace top with screws. Oncounterflow units secure the combustion air
intakepipeto theairintakecoupling usingtherubbercoupling andwormgearhose clampsprovidedwiththeunit.Thecounterflow
rubbercouplingallowsserviceremovalofairintakepipinginternaltothefurnaceblowercompartment. Thecombustionairintake
pipecanalsobesecureddirectlytothecounterflowunit airintakepipecoupling.
Vent Termination Clearances
Figure 7
12"
Non-Direct Vent
Vent/Flue Termination
No Terminations
Above Walkway
12"
min.
4'
min.
Non-Direct Vent
Vent/Flue Termination
Direct Vent
Vent/Flue Termination
<10'
Forced Air
Inlet
Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
Grade or Highest
Anticipated
Snow Level
3' min.
12" min.
4' min.
12" min.
45 DEGREE
ELBOWS
Increased Clearance Configuration
Figure 8A

14
COMBUSTIONAIR INTAKE OPTION: The RF000142 coupling (Figure 8B) can be secured
directly to the furnace intake coupling if condensation is a concern. If the RF000142 is
used on the combustion air inlet, it must be installed with the arrow pointing up. It
should be noted, the combustion air will actually be moving in a direction opposite of
the arrow on the RF000142 coupling. It must have a field supplied, trapped drain tube
free-draining to proper condensate disposal location. Aloop in the drain tube can serve
as a trap. The unused RF000142 drain fitting should be capped.
NON-DIRECT VENT INSTALLATIONS
Aminimumofone90°elbowshould beinstalledonthe combustion
air intake “coupling” to guard against inadvertent blockage.
ALTERNATE VENT/FLUE LOCATION
Thealternatevent/fluelocationisthelargeholedirectlyinlinewith
theinduceddraftbloweroutlet. Tousethealternatevent/flueloca-
tion refer to the following steps and the “Alternate Vent/Flue Loca-
tion” figure. To use an alternate vent location on a counterflow /
horizontal model, a special kit is required.
NOTE: In the horizontal left installation position, a means of con-
densate collection must be provided to keep vent pipe condensate
from entering the draft inducer housing. If the vent drain elbow is
eliminated from the installation, an RF000142 kit must be used.
1. Remove the four screws from the vent pipe flange on top the
furnace.
2. Remove the internal elbow and vent pipe
3. Cut 2 1/2" from the flange .
4. Remove plastic plug in line with the inducer outlet
5. Install cut end of the flanged section and connect to inducer
with rubber coupling supplied with furnace.
6. Install screws removed in step 1 securing flange to cabinet.
T HE RUBBER ELBOW IS NOT DESIGNED TO SUPPORT A LOAD . W HEN THE
RUBBER ELBOW IS MOUNTED EXTERNALLY TO THE FURNACE CABINET ,
EXTREME CARE MUST BE TAKEN TO ADEQUATELY SUPPORT FIELD -
SUPPLIED VENT / FLUE PIPING , AS DAMAGE CAN RESULT IN LEAKS
CAUSING BODILY INJURY OR DEATH DUE TO EXPOSURE TO FLUE GASES ,
INCLUDING CARBON MONOXIDE
WARNING
ALTERNATE COMBUSTION AIR PROVISION
(Upflow / Horizontal models only)
When using the alternate venting location, either in a horizontal
left side down installation or a vertical installation using down –
venting, an alternate combustion air opening can be used.Alocat-
ing dimple is located on the right side of the furnace cabinet. The
locating dimple is 1 7/8" measured from the front edge of the
cabinet in line with the knock out. To use the alternate com-
bustion air location:
1. Remove screws and combustion air flange from cabinet.
2. Insert cabinet plug in unused combustion air hole.
3. Drill a pilot hole at the cabinet dimple (size dictated by
knockout tool used).
E DGES OF SHEET METAL HOLES MAY BE SHARP . U SE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .
WARNING
CUTHERE
Figure 10
Vent/Flue Pipe Cuts
Insert flange. Cut 2 ½” long.
R 000142F
Figure 9
T HE RUBBER ELBOW IS NOT DESIGNED TO SUPPORT A LOAD . W HEN THE
RUBBER ELBOW IS MOUNTED EXTERNALLY TO THE FURNACE CABINET ,
EXTREME CARE MUST BE TAKEN TO ADEQUATELY SUPPORT FIELD -
SUPPLIED VENT / FLUE PIPING , AS DAMAGE CAN RESULT IN LEAKS
CAUSING BODILY INJURY OR DEATH DUE TO EXPOSURE TO FLUE GASES ,
INCLUDING CARBON MONOXIDE
WARNING
Figure 8B
VENT-DRAIN

15
4. Use a knockout tool to create a 3" diameter hole
5. Install combustion air flange and secure with screws
removed in step one.
NON-DIRECT VENT (SINGLE PIPE) PIPING
Non-direct vent installations require only a vent/flue pipe. The
vent pipe can be run horizontally with an exit through the side of
the building or run vertically with an exit through the roof of the
building. The vent can also be run through an existing unused
chimney; however, it must extend a minimum of 12 inches above
thetopofthe chimney. The space between the ventpipeandthe
chimney must be closed with a weather-tight, corrosion-resistant
flashing.
Althoughnon-directventinstallationsdonotrequireacombustion
airintake pipe,aminimumofone90°elbowshouldbeattachedto
the furnace’s combustion airintake if:anuprightinstallationuses
the standard intake location, or a horizontal installation uses the
alternate air intake location. This elbow will guard against inad-
vertent blockage of the air intake.
VENT/FLUE PIPE LENGTHS AND DIAMETERS
(For Installations At or Above 7,000 Feet using 3” Venting)
NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
RefertotheDirectandNon-DirectVentTableforapplicablelength,
elbows, and pipe diameter for construction of the vent/flue pipe
system of a non-direct vent installation. In addition to the vent/
fluepipe,asingle90° elbow should be secured to the combustion
air intake to prevent inadvertent blockage. The tee used in the
vent/flueterminationmustbeincludedwhendeterminingthenum-
ber of elbows in the piping system.
VENT/FLUE PIPE TERMINATIONS
NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
Thevent/fluepipe may terminate vertically,asthrougha roof, or
horizontally,as throughanoutsidewall.
Vertical vent/fluepipeterminationsshouldbeasshowninthe fol-
lowing figure. Refer to Vent/Flue Pipe and Combustion Air Pipe -
TerminationLocationsfordetailsconcerning locationrestrictions.
Thepenetration of the vent through the roof must be sealed tight
with proper flashing such as is used with a plastic plumbing vent.
Horizontal vent/flue pipe terminations should be as shown in the
followingfigure. RefertoVent/FluePipeandCombustionAirPipe.
Tosecurethepipepassingthroughthewallandprohibitdamageto
pipingconnections,acouplingshouldbe installedoneithersideof
the wall and solvent cemented to a length of pipe connecting the
twocouplings. The lengthofpipeshouldbethewallthickness plus
the depth of the socket fittings to be installed on the inside and
outside of the wall. The wall penetration should be sealed with silicone caulking material.
NOTE: Terminate both pipes in the same pressure zone (same side of roof, no major obstacles between pipes, etc.).
B E SURE NOT TO DAMAGE INTERNAL WIRING OR OTHER COMPONENTS
WHEN REINSTALLING COUPLING AND SCREWS .
CAUTION
MODEL PIPE
SIZE 12345678
2^145 140 135 130 125 120 115 110
3 168 161 154 147 140 133 126 119
25550454035302520
3 127 120 113 106 99 92 85 78
2^30 25 20 15 10 5 N/A N/A
3^72 65 58 51 44 37 30 23
2^30 25 20 15 10 5 N/A N/A
3^72 65 58 51 44 37 30 23
2^40 35 30 25 20 15 10 5
37265585144373023
26055504540353025
3 168 161 154 147 140 133 126 119
23025201510 5N/AN/A
3 113 106 99 92 85 78 71 64
2 N/A N/A N/A N/A N/A N/A N/A N/A
36558514437302316
2 100 95 90 85 80 75 70 65
3 137 130 123 116 109 102 95 88
26055504540353025
3 127 120 113 106 99 92 85 78
2353025201510 5N/A
3 160 153 146 139 132 125 118 111
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 127 120 113 106 99 92 85 78
7,000 ft altitude or above use 3" pipe
^*MSS920402BN - add 20' of 2" pipe for upflow position
^*MSS920803BN- add 10' of 2" pipe for upflow position, add 66' of 3" pipe for upflow position
^*MSS920804CN- add 25' of 2" pipe for upflow position, add 58' of 3" pipe for upflow position
^ *MSS920805CN- add 15' of 2" pipe for upflow position, add 58' of 3" pipe for upflow position
MODEL PIPE
SIZE 12345678
2^100 95 90 85 80 75 70 65
3 168 161 154 147 140 133 126 119
24540353025201510
3 168 161 154 147 140 133 126 119
2^35 30 25 20 15 10 5 N/A
3 168 161 154 147 140 133 126 119
26055504540353025
3 113 106 99 92 85 78 71 64
24540353025201510
3 120 113 106 99 92 85 78 71
2403530252015105
3 151 144 137 130 123 116 109 102
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 158 151 144 137 130 123 116 109
2 100 95 90 85 80 75 70 65
3 137 130 123 116 109 102 95 88
24540353025201510
3 168 161 154 147 140 133 126 119
2403530252015105
3 120 113 106 99 92 85 78 71
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 113 106 99 92 85 78 71 64
2 N/A N/A N/A N/A N/A N/A N/A N/A
3 110 103 96 89 82 75 68 61
7,000 ft altitude or above use 3" pipe
^ *MSS960402BN- add 25' of 2" pipe for upflow position
^*MSS960803BN- add 20' of 2" pipe for upflow position
Number of Elbows
*MSS920402BN
*MSS920603BN
*MSS921004CN
*MSS960603BN
*MSS920803BN
*MSS920804CN
*MSS920805CN
*CSS920804CN
*CSS921005CN
*MSS960402BN
*MSS921005CN
*MSS921205DN
*CSS920402BN
*CSS920603BN
*MSS960804CN
*MSS960805CN
*MSS961005CN
*CSS961005CN
*MSS960803BN
*CSS961205DN
*MSS961205DN
*CSS960402BN
*CSS960603BN
*CSS960804CN
*MSS9* / *CSS9 Direct Vent (2-Pipe) & Non-Direct Vent (1-Pipe)
Maximum Allowable Length of Vent/FLue Pipe

16
Figure 11
VENT/FLUE TEE (
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
OPTIONAL)
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
12" MIN.
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
Figure 14
Figure 13
STRAIGHT
ELBOWS
Floor
Use alternate vent
& combination air locations
DOWN VENTING UPFLOW MODEL FURNACES ONLY
Basement/Crawlspace
Condensate trapped
to prevent flue gas from escaping
and routed to field supplied
condensate disposal
Combustion Air Pipe
Vent Pipe
All piping and fittings must be joined per material manufacturer’s specifications
to prevent separation and flue gas leaks.
Both Pipes Terminated
Outside Structure
1/4” per foot min. slope
6’ MAX.
Field Supplied
Drain Tee on Vent Pipe
COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
TEE (OPTIONAL)
96”MAX.-3”MIN.
ROOFLINE
12” MIN
HEIGHT
DIFFERENCE
12” MIN TO ROOF OR
HIGHEST ANTICIPATED
SNOW LEVEL
Figure 12

17
DIRECT VENT (DUAL PIPE) PIPING
Direct vent installations require both a combustion air intake and a vent/flue pipe. The pipes may be run horizontally and exit
through theside ofthe buildingor runvertically and exitthrough theroof ofthe building. The pipesmay berun throughan existing
unusedchimney; however, they must extend a minimum of 12 inches above the top of the chimney. The space between the pipes
andthe chimney mustbe closed with a weather tight, corrosion resistant flashing. Both the combustion air intake and a vent/flue
pipe terminations must be in the same atmospheric pressure zone. Refer to Vent/Flue and Combustion Air Pipe - Termination
LocationsorConcentricVentTerminationforspecificdetailsonterminationconstruction. Fordetailsconcerning connectionofpipes
tothe furnace,referto theVent/FluePipeandCombustionPipe-StandardFurnaceConnectionsorAlternateFurnaceConnections.
VENT/FLUE & COMBUSTION AIR PIPE LENGTHS & DIAMETERS
Refertothefollowingtableforapplicablelength,elbows,and
pipediameter forconstructionof thevent/flueandcombus-
tion air intake pipe systems of a direct vent (dual pipe) in-
stallation. The number of elbows tabulated represents the
numberofelbowsand/orteesineach(Vent/Flue&Combus-
tionAir Intake) pipe. Elbows and/or tees used in the termi-
nations must be included when determining the number of
elbows in the piping systems.
If the combustion air intake pipe is to be installed above a
finished ceiling or other area where dripping of condensate
will be objectionable, insulation of the combustion air pipe
maybe required.
Use 1/2” thick closed cell foam insulation such as
Armaflex™ or Insultube™ where required.
VENT/FLUE AND COMBUSTION AIR PIPE TERMINATIONS
Thevent/flueandcombustionairpipesmayterminateverti-
cally,asthrougharoof,orhorizontally,asthroughanoutside
wall.
Verticalpipeterminationsshouldbeasshowninthefollowing
figure. Refer to Vent/Flue Pipe and Combustion Pipe - Ter-
minationLocations fordetailsconcerninglocationrestric-
tions. The penetrations through the roof must be sealed
tight with proper flashing such as is used with a plastic
plumbingvent.
Vent & CombustionAir Intake Measurements for Stan-
dard Horizontal Terminations (Dual Pipe)
Center to center = 10” min / 24” max.
Vertical separation: 0” - 24”
Vent termination from wall = 8” min / 12” max.
Combustion air intake from wall = 6” max.
Vent and intake clearancetogroundoranticipatedsnow
level = 12” min.
VENT/INTAKE TERMINATIONS FOR INSTALLATION OF
MULTIPLE DIRECT VENT FURNACES
If more than one direct vent furnace is to be installed
verticallythrougha commonrooftop,maintain thesame
Standard Horizontal Terminations (Dual Pipe)
Figure 15
90º OR 45°
ELBOW
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
6” MAX
10”- 24”
4” MIN
Alternate Horizontal Vent Termination (Dual Pipe)
Figure 16
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3” - 24”

18
minimumclearancesbetweentheexhaustvent andairintaketerminations ofadjacentunitsaswiththeexhaustventandairintake
terminations of a single unit.
If more than one direct vent furnace is to be installed horizontally through a common side wall, maintain the clearances as in the
following figure.Always terminate all exhaust vent outlets at the same elevation and always terminate all air intakes at the same
elevation.
CONCENTRIC VENT TERMINATION
Refer to the directions provided with the Concentric Vent Kit
(DCVK)forinstallationspecifications.
SIDE WALL VENT KIT
Thiskitistobeusedwith2”or3” directventsystems.The vent kit mustterminateoutsidethestructure andmaybeinstalled with
theintakeand exhaustpipeslocated side-by-sideorwith onepipeabove theother.These kits are NOTintendedfor use withsingle
pipe(non-directvent)installations.
Refer to the directionsfurnished with the SideWall Vent Kit (p/n 0170K00000S or 0170K00001S)for installationspecifica-
tions.
C ONDENSATE D RAIN L INES & D RAIN T RAP
A condensinggas furnaceachieves itshigh levelof efficiencyby extractingheat fromthe productsof combustion tothe point where
condensation takes place. The condensate must be collected in the furnace drain trap and routed to an appropriate drain
location in compliance with local and national codes.
Followthebulletslistedbelowwheninstallingthedrainsystem. Refertothefollowingsectionsforspecificdetailsconcerningfurnace
drain trap installation and drain hose hook ups.
Vertical Installation
HorizontalInstallation
Side Wall Vent Kit
Figure 19
Combustion Air Intake may also be snorkeled
to obtain 12” min ground clearance.
Alternate Vent Termination Above Anticipated Snow Level
(Dual Pipe)
Figure 17
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3”-24” BETWEEN PIPES
Termination of Multiple Direct Vent Furnaces
Figure 18
3” MIN
12” MIN TO GRADE OR HIGHEST
ANTICIPATED SNOW LEVEL
3”MIN
24”MAX
12” MIN SEPARATION

19
• Thedraintrapsuppliedwiththefurnacemust be used.
• The drain trap must be primed at time of installation.
• Thedrainline betweenfurnaceanddrain locationmustmeet local and nation codes.
• Thedrainline betweenfurnace anddrain locationmust maintain a1/4 inchper footdownward slopetoward thedrain.
• Donottrapthedrainlinein any other location than at thedraintrapsuppliedwiththefurnace.
• If the drain line is routed through an area which may see temperatures near or below freezing, precautions must be
takentopreventcondensate fromfreezingwithinthedrainline.
• If an air conditioning coil is installed with the furnace, a common drain may be used. An open tee must be installed in
the drain line, near the cooling coil, to relieve positive air pressure from the coil’s plenum. This is necessary to prohibit
anyinterferencewith thefunctionofthefurnace’sdraintrap.
NOTE: In vertical installations, air conditioning coil condensate may drain into the furnace trap as long as there is a trap
between the coil and the furnace trap and the drain pipe is not terminating below the water level of the furnace trap.
GENERAL DRAIN INFORMATION
All furnace models come with a factory installed drain trap. For vertical installations, the trap will remain in the factory
position except for a counterflow when the installer desires the drain to exit the right side. All furnace models installed
horizontally require the trap to be relocated. Many drain hoses have a built–in grommet which will provide a cabinet seal
when installed. See instructions below for your model and installation position. NOTE: Both sides of the drain trap must be
primed prior to initial furnace start up
FIELD SUPPLIED DRAIN
Drain the furnace and air conditioning coil if applicable, in compliance with code requirements. In horizontal or counterflow
installations, a field installed rubber coupling will allow the drain trap to be removed for cleaning. The drain trap must be
primed before initial furnace start up. When an air condition-
ing coil drain is connected to the field supplied furnace drain,
it must be vented.An open tee must be installed at a height no
higher than the bottom of the furnace collector box to prevent
air conditioning condensate from backing up into the furnace,
if the common drain was blocked.
UPFLOW MODEL INSTALLED VERTICALLY
The trap and factory installed hoses remain as shipped. The
furnace drain may exit either the right or left side of the fur-
nace cabinet. Both sides of the cabinet have two .875” diam-
eter holes which can be used interchangeably for drain and low
voltage wiring purposes. If a higher drain exit is needed, a
.875” diameter hole may be added in the area shown in Figure
21. Any unused cabinet opening must be sealed. Do not allow
drain hose to sag or trap water.
Side Cut-Out
12”
3” Right side shown.
Acceptable
area for
drain hole.
Figure 21
#3
#1 #2
#4 #5
#6
#7 #8
#9
#10
#11
100 Degree
Elbow
Coupling
Figure 20
NOTE: Hoses are model specific
and not all hoses will be shipped with all models.

20
DRAIN EXITING RIGHT SIDE
1. Locate and Install the 45º pipe / hose drain coupling
from the outside of the cabinet (barbed end goes in
the cabinet) through hole in the right side of the
cabinet and secure with two field supplied #8 self-
tapping screws (see Figure 22).
2. Locate the long drain hose #3 and cut at line “A” .
3. Install large end of hose #3 to trap outlet and secure
with 1.25" clamp.
4. Installsmallerendofhose#3 on 45º elbow and secure
with 1" clamp.
5. Refer to Field Supplied Drain section for instructions
onfieldsupplied/installeddrainonoutletoffurnace
trap.
DRAIN EXITING LEFT SIDE
1. Install the 45 degree pipe / hose drain coupling from
the outside of the cabinet (barbed end goes in the
cabinet) through the hole in the left side of the
cabinet and secure with two field supplied #8 self-
tapping screws (see Figure 22).
2. Locate the long drain hose #3 and cut at “B” line for
a 17.5" cabinet; cut at line “C” for a 21" cabinet; do
not cut for a “D” width cabinet.
3. Install large end of hose #3 to trap outlet and secure
with 1.25" clamp.
4. Install smaller end of hose #3 on 45º elbow and secure with 1" clamp.
5. Refer to Field Supplied Drain section for instructions on field supplied / installed drain on outlet of furnace trap.
UPFLOW MODEL INSTALLED HORIZONTALLY WITH RIGHT SIDE DOWN
Minimum 5 1/2" clearance is required for the drain trap beneath the furnace.
1. Remove the clamps from both ends of the drain hoses.
2. Removethetwoscrews holding the drain trap to the blower
deck.
3. Remove the trap and two hoses from the blower deck
4. Remove the two plugs from the right side of the cabinet
and install them in the blower deck.
5a.(Draining the Vent Elbow) Locate hose #2 (factoryinstalled)
and cut 1” away from the 45 degree bend, discard the 45
degree section. Insert hose #2 from outside the cabinet
through the cabinet drain hole nearest the top, secure it to
the barbed fitting in the elbow with a red clamp.
5b. (Option for draining the vent elbow) The RF000142 drain
coupling may be used in conjunction with the steps in 5a if
waterisnotdraining effectively from the internal vent pipe.
The RF000142 may be installed externally to the furnace
cabinet on a short PVC stub in the vent outlet fitting. The
unused drain port on the RF000142 must be capped.Afield
installed drain tube attached to the RF000142 must be
trapped to prevent flue gas from escaping.
6. (Draining the Collector Box) Install the non-grommet end of hose #11 from outside the cabinet in the bottom drain
hole. Install on collector box and secure with a silver clamp.
7. Use two silver clamps and secure the hoses to drain trap. The trap outlet faces the front of the furnace. Secure the
trap to the cabinet using two screws removed in step 2 by inserting the two screws through the large set of holes in the
top mounting tabs of the trap into the two predrilled holes in the side of the cabinet.
8. Refer to Field Supplied Drain section for instructions on field supplied / installed drain on outlet of furnace trap.
Installer selects right or left side drain
and installs this hose accordingly.
Hose #1
Hose #2
45 degree
barb-pipe
adapter
45 degree
barb-pipe
adapter
Figure 22
Hose #11
Hose #2
Figure 23