Amana CEC96 Series User manual

5151 San Felipe Suite 500
Houston, TX 77056
www.goodmanmfg.com • www.amana-hac.com
©2014-2017 Goodman Manufacturing Company, L.P.
*MEC96 & *CEC96
T
WO -S TAGE
G AS F URNACES
IOG-2011K
11/2017
(Type FSPCATEGORY IV Direct
or Non Direct Vent Air 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.This includes all safety
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 are intended
as supplemental to existing practices. However, if there is
a direct conflict between existing practices and the content
ofthismanual, the precautions listed here takeprecedence.
RECOGNIZE THIS SYMBOL
AS A SAFETY PRECAUTION.
*NOTE: Please contact your distributor or our website for
theapplicableSpecificationSheetreferredtointhismanual.
TABLE OF CONTENTS
isaregisteredtrademarkofMaytagCorporationoritsrelatedcompaniesandisusedunderlicense. All rights reserved.
SAFETY CONSIDERATIONS .................................... 2
SHIPPING INSPECTION ............................................ 4
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ................... 4
TOTHE INSTALLER .............................................. 5
PRODUCT DESCRIPTION......................................... 5
FEATURES ....................................................... 5
PRODUCT APPLICATION ......................................... 5
LOCATION REQUIREMENTS & CONSIDERATIONS ........... 6
CLEARANCES AND ACCESSIBILITY ................................... 7
EXISTING FURNACE REMOVAL ..................................... 8
THERMOSTAT LOCATION .......................................... 8
COMBUSTION & VENTILATION AIR REQUIREMENTS .................. 8
INSTALLATION POSITIONS...................................... 9
HORIZONTAL APPLICATIONS & CONSIDERATIONS ..................... 9
FURNACE SUSPENSION ........................................... 9
FRONT COVER PRESSURE SWITCH TUBE LOCATION ................. 9
DRAIN TRAP AND LINES .........................................10
HORIZONTAL FURNACE 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 .................10
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT ................11
MATERIALS AND JOINING METHODS ..............................11
PROPER VENT/FLUE AND COMBUSTION AIR PIPING PRACTICES .....11
TERMINATION LOCATIONS ........................................12
CANADIAN VENT PIPE AND COMBUSTION AIR PIPE REQUIREMENTS ..12
STANDARD FURNACE CONNECTIONS ..............................13
VENT/FLUE PIPE ..............................................13
NON-DIRECT VENT (SINGLE PIPE) PIPING ........................15
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 ...................................18
FIELD SUPPLIED DRAIN .........................................18
UPFLOW MODEL INSTALLED VERTICALLY..........................19
DRAIN EXITING RIGHT SIDE .....................................19
DRAIN EXITING LEFT SIDE ......................................20
UPFLOW MODEL INSTALLED HORIZONTALLY
WITH RIGHT SIDE DOWN .....................................20
UPFLOW MODEL INSTALLED HORIZONTALLY
WITH LEFT SIDE DOWN ......................................20
COUNTERFLOW MODEL INSTALLED VERTICALLY...................21
DRAIN EXITING LEFT SIDE.....................................21
DRAIN EXITING RIGHT SIDE....................................22
COUNTERFLOW MODEL INSTALLED HORIZONTALLY WITH
RIGHT SIDE DOWN...........................................22
COUNTERFLOW MODEL INSTALLED HORIZONTALLY WITH
LEFT SIDE DOWN............................................23

2
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.
ELECTRICAL CONNECTIONS ...................................24
WIRING HARNESS...............................................24
115 VOLT LINE CONNECTIONS ..................................24
JUNCTION BOX RELOCATION .....................................24
24 VOLT THERMOSTAT WIRING ..................................25
SINGLE-STAGE HEATING THERMOSTAT APPLICATION ................25
FOSSIL FUEL APPLICATIONS ......................................25
TWINNING .....................................................26
115 VOLT LINE CONNECTION OF ACCESSORIES
(HUMIDIFIER AND ELECTRONIC AIR CLEANER) ..................26
GAS SUPPLY AND PIPING .......................................26
HIGH ALTITUDE DERATE.........................................27
PROPANE GAS CONVERSION .....................................27
GAS PIPING CONNECTIONS ......................................27
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] ..............31
FILTERS - READ THIS SECTION BEFORE INSTALLING
THE RETURN AIR DUCT WORK................................31
UPRIGHT INSTALLATIONS .........................................31
HORIZONTAL INSTALLATIONS......................................32
STARTUP PROCEDURE & ADJUSTMENT ......................32
DRAIN TRAP PRIMING ...........................................32
FURNACE OPERATION ...........................................32
GAS SUPPLY PRESSURE MEASUREMENT ...........................32
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT .......33
DIP SWITCH SETTINGS .........................................34
GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY)...........46
TEMPERATURE RISE .............................................46
CIRCULATOR BLOWER SPEEDS ...................................46
BLOWER HEAT OFF DELAY TIMINGS .............................47
NORMAL SEQUENCE OF OPERATION .........................47
POWER UP....................................................47
HEATING MODE ................................................47
COOLING MODE ................................................48
FAN ONLY MODE ..............................................48
OPERATIONAL CHECKS .........................................48
SAFETY CIRCUIT DESCRIPTION ...............................48
INTEGRATED CONTROL MODULE .................................48
PRIMARY LIMIT .................................................48
AUXILIARY LIMIT ................................................48
ROLLOUT LIMIT..............................................48
PRESSURE SWITCHES ............................................48
FLAME SENSOR ................................................48
TROUBLESHOOTING .............................................49
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ..................49
CHECKING FLAME SIGNAL .......................................49
LIMIT FAULT CODES ............................................49
DIAGNOSTIC CHART .............................................50
FAULT RECALL .................................................50
RESETTING FROM LOCKOUT .....................................50
MAINTENANCE ...................................................51
ANNUAL INSPECTION ............................................51
FILTERS ........................................................51
BURNERS ......................................................52
INDUCED DRAFT AND CIRCULATOR BLOWERS ......................52
CONDENSATE TRAP AND DRAIN SYSTEM (QUALIFIED SERVICER ONLY)52
FLAME SENSOR (QUALIFIED SERVICER ONLY) ....................52
FLUE PASSAGES (QUALIFIED SERVICER ONLY) ....................52
BEFORE LEAVING AN INSTALLATION .........................52
REPAIR AND REPLACEMENT PARTS...........................52
TROUBLESHOOTING CHART...................................53
WIRING DIAGRAM ...............................................55
SPECIAL INSTRUCTIONS FOR PRODUCTS INSTALLED
IN THE STATE OF MASSACHUSETTS ..................56
O NLY PERSONNEL THAT HAVE BEEN TRAINED TO INSTALL , ADJUST , SERVICE OR
REPAIR ( HEREINAFTER , “ SERVICE ”) THE EQUIPMENT SPECIFIED IN THIS MANUAL
SHOULD SERVICE THE EQUIPMENT . T HE MANUFACTURER WILL NOT BE RESPONSIBLE
FOR ANY INJURY OR PROPERTY DAMAGE ARISING FROM IMPROPER SERVICE OR
SERVICE PROCEDURES . I F YOU SERVICE THIS UNIT , YOU ASSUME RESPONSIBILITY
FOR ANY INJURY OR PROPERTY DAMAGE WHICH MAY RESULT . I N ADDITION , IN
JURISDICTIONS THAT REQUIRE ONE OR MORE LICENSES TO SERVICE THE EQUIPMENT
SPECIFIED IN THIS MANUAL , ONLY LICENSED PERSONNEL SHOULD SERVICE THE
EQUIPMENT . I MPROPER INSTALLATION , ADJUSTMENT , SERVICING OR REPAIR OF
THE EQUIPMENT SPECIFIED IN THIS MANUAL , OR ATTEMPTING TO INSTALL , ADJUST ,
SERVICE OR REPAIR THE EQUIPMENT SPECIFIED IN THIS MANUAL WITHOUT PROPER
TRAINING MAY RESULT IN PRODUCT DAMAGE , PROPERTY DAMAGE , PERSONAL
INJURY OR DEATH .
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 solution made specifically for the detec-
tion of leaks to check all connections, as specified in GAS
SUPPLY AND PIPING section of this manual.

3
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 shall alsobe handled by duct(s)
sealed to the furnace casing and terminating outside the
space containing the furnace.
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
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.
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 water to both inlet ports 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.

4
SHIPPINGINSPECTION
All units are securely packed in shipping containers tested ac-
cordingto International SafeTransitAssociationspecifications.
The carton must be checked upon arrival for external damage.
If damage is found, a request for inspection by carrier’s agent
mustbemade inwritingimmediately.
The furnace must be carefully inspected on arrival for damage
andboltsorscrewswhichmayhavecomelooseintransit. Inthe
event of damage the consignee should:
1. Makeanotationondeliveryreceiptofanyvisibledamage
toshipmentorcontainer.
2. Notifycarrierpromptlyandrequestaninspection.
3. Withconcealeddamage, carriermustbenotifiedassoon
as possible - preferably within five days.
4. Filetheclaimwiththefollowingsupportdocumentswithin
a nine month statute of limitations.
• Original or certified copy of the Bill of Lading, or
indemnitybond.
• Originalpaidfreightbillorindemnityinlieuthereof.
• Originalor certifiedcopyof theinvoice,showingtrade
andotherdiscounts or reductions.
• Copy of the inspection report issued by carrier’s
representativeatthetimedamageisreportedtocarrier.
Thecarrierisresponsibleformakingpromptinspectionofdam-
age and for a thorough investigation of each claim. The dis-
tributoror manufacturerwillnotacceptclaimsfromdealersfor
transportationdamage.
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
B10259-216
CO can cause serious illness including permanent brain
damageordeath.
Advertencia especial para la instalación de 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 MONOXYDEDE CARBONE
Le monoxyde de
des carbonepeutcauserdes maladies gravestellesque 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
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
NOTE: Dischargeyour body’sstatic electricitybeforetouching
unit. An electrostatic discharge can adversely affect electrical
components.
Usethefollowingprecautionsduringfurnaceinstallationandser-
vicingtoprotecttheintegratedcontrolmodulefromdamage. By
putting the furnace, the control, and the person at the same
electrostaticpotential,thesestepswill help avoid exposingthe
integratedcontrol module to electrostaticdischarge. This pro-
cedure is applicable to both installed and non-installed (un-
grounded)furnaces.
1. Disconnect all power to the furnace. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body’s electrostatic
chargetoground.
2. Firmly touch a clean, unpainted, metal surface of the
furnaces near the control. Any tools held in a person’s
handduringgroundingwillbedischarged.
3. Service integrated control module or connecting wiring
followingthedischargeprocessinstep2. Usecautionnot
torecharge yourbodywith staticelectricity;(i.e.,donot
move or shuffle your feet, do not touch ungrounded
objects,etc.). Ifyoucomeincontactwithanungrounded
object,repeatstep 2beforetouchingcontrol orwires.

5
4. Discharge your body to ground before removing a new
control from its container. Follow steps 1 through 3 if
installingthecontrolonafurnace. Return anyoldornew
controlstotheircontainersbeforetouchinganyungrounded
object.
TOTHE INSTALLER
Beforeinstalling thisunit,pleasereadthismanualthoroughlyto
familiarize yourself with specific items which must be adhered
to, including but not limited to: unit maximum external static
pressure,gas pressures,BTUinput rating,properelectrical con-
nections, circulating air temperature rise, minimum or maxi-
mum CFM, and motor speed connections.
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
P RODUCT D ESCRIPTION
FEATURES
The *MEC96 furnace may be installed upflow or horizontally
with left or right side down. The *CEC96 furnace may be
installeddownfloworhorizontallywith left or right sidedown.
*MEC96 & *CEC96 two-stage gas furnaces features a multi-
speed ECM indoor fan motor, two heating inputs (W1 & W2),
two cooling inputs (YLO & Y) and a two stage gas valve. A
single stage heating thermostat may also be used in con-
junction with timed transition to high fire by the furnace
integrated control board.
P RODUCT A PPLICATION
This furnace is primarily designed for residential home-heating
applications. It is NOT designed or certified for use in mobile
homes, trailers or recreational vehicles. Neither is it designed
or certified for outdoor applications. The furnace must be in-
stalled indoors (i.e., attic space, crawl space, or garage area
provided the garage area is enclosed with an operating door).
This furnace can be used in the following non-industrial com-
mercialapplications:
Schools, Office buildings, Churches, Retail stores, Nursing
homes, Hotels/motels, Common or office areas
Insuchapplications,thefurnace must be installedwiththefol-
lowingstipulations:
• It must be installed per the installation instructions
providedandperlocalandnationalcodes.
• Itmustbeinstalledindoorsinabuildingconstructedon
site.
• It must be part of a ducted system and not used in a
freeairdeliveryapplication.
• It must not be used as a “make-up” air unit.
• It mustbeinstalled as a two-pipe systemforcombustion
air.
• AllotherwarrantyexclusionsandrestrictionsapplyThis
furnace is an ETL dual-certified appliance and is
appropriateforusewithnaturalorpropanegas(NOTE:
Ifusingpropane,apropaneconversion kitisrequired).
Dual certification means that the combustion air inlet pipe is
optionaland the furnace can bevented as a:
Non-directvent (singlepipe)centralforcedairfurnace
in which combustion air is taken from the installation
area or from air ducted from the outside or,
Direct vent (dual pipe) central forced air furnace in
whichallcombustionairsupplieddirectlytothefurnace
burnersthrougha special air intake system outlinedin
theseinstructions.
Gas furnaces manufactured on or after May 1, 2017 are not
permitted to be used in Canada for heating of buildings or
structures under construction.
In the U.S.A. this furnace may be used as a construction site
heater ONLY if allofthe following conditions are met:
• The vent system is permanently installed per these
installationinstructions.
• Aroomthermostatisusedtocontrolthefurnace.Fixed
jumpers that provide continuous heating CANNOT be
usedandcancauselongterm equipment damage. Bi-
metal thermostats, or any thermostat affected by
vibration must not be used
during construction.
• Returnairductsareprovidedandsealedtothefurnace.
• A return air temperature range between 60ºF (16ºC)
and 80ºF (27ºC) is maintained.
• Airfilters areinstalledin thesystemandreplaceddaily
duringconstructionanduponcompletionofconstruction.
• The input rate and temperature rise are set per the
furnace ratingplate.
• The furnace must be installed as a two pipe system,
using 100% outside air for combustion during
construction.
•Thefurnaceheatexchanger,components,ductsystem,
air filters and evaporator coils are thoroughly cleaned
following final construction clean up by a qualified
person.
• Allfurnaceoperatingconditions(includingignition,input
rate, temperature rise and venting) are verified by a
qualified
person accordingtotheseinstallation instructions.
• Furnacedoorsmustbeinplaceonthefurnacewhilethe
furnace is operating in any mode.
• Damage or repairs due to failure to comply with these
requirementsarenotcoveredunderthewarranty.
NOTE: The Commonwealth of Massachusetts requires that the
followingadditionalrequirementsmustalsobemet:
• Gasfurnacesmustbeinstalledbyalicensedplumberor
gas fitter.

6
• AT-handle gas cock must be used.
• Iftheunit istobeinstalledinanattic,thepassageway
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 operation instructions, all local building codes and ordi-
nances. In their absence, follow the latest edition of the Na-
tional Fuel Gas Code (NFPA 54/ANSI Z223.1), and/or CAN/CSA
B149.1-15InstallationCodes,localplumbingorwastewatercodes,
andotherapplicablecodes.
Acopy of the National Fuel Gas Code (NFPA54/ANSI Z223.1)
canbeobtained fromanyofthe following:
American National Standards Institute
25 West 43rd Street, 4th Floor
New York, NY 10036
NationalFireProtectionAssociation
1BatterymarchPark
Quincy, MA 02169-7471
CSAInternational
8501EastPleasantValley
Independence,OH44131
Theratedheatingcapacityofthefurnaceshouldbegreaterthan
orequaltothetotalheatlossoftheareatobeheated. Thetotal
heat loss should be calculated by an approved method or in ac-
cordancewith“ASHRAEGuide”or“ManualJ-LoadCalculations”
publishedbytheAirConditioningContractors ofAmerica.
Acopyof the CAN/CSA B149.1-15InstallationCodescanalso
beobtainedfrom:
CSAInternational
178RexdaleBoulevard
Etobicoke, Ontario, Canada M9W 1R3
L OCATION R EQUIREMENTS &C ONSIDERATIONS
Followtheinstructionslistedbelowandtheguidelinesprovided
intheCombustionandVentilationAirRequirementssectionwhen
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
• Centrallylocatethefurnacewithrespecttotheproposed
or existing air distribution system.
• Ensure the temperature of the return air entering the
furnaceisbetween55°Fand100°Fwhenthefurnaceis
heating.
• Provide provisions for venting combustion products
outdoors through a proper venting system. Special
considerationshould begiventovent/fluepiperouting
andcombustion airintakepipewhenapplicable. Refer
toVent/FluePipeandCombustionAirPipe-Termination
Locationsfor appropriateterminationlocationsand to
determine if the piping system from furnace to
terminationcan beaccomplishedwithin theguidelines
given. NOTE: The length of flue and/or combustion
airpipingcan be alimitingfactorinthe locationofthe
furnace.
• Locatethefurnacesocondensateflowsdownwardsto
thedrain. Do not locate thefurnace or its condensate
drainage system in any area subject to below freezing
temperatureswithoutproper freezeprotection.Refer
toCondensateDrainLinesandTrap forfurtherdetails.
• Ensure adequate combustion air is available for the
furnace. Improper or insufficient combustion air can
exposebuildingoccupantsto gascombustionproducts
that could include carbon monoxide. Refer to
Combustionand VentilationAirRequirements.
• Set the furnace on a level floor to enable proper
condensatedrainage. Ifthefloorbecomeswetordamp
attimes,placethefurnaceabovetheflooronaconcrete
base sized approximately 1-1/2" larger than the base
of the furnace. Refer to the Horizontal Applications
andConsiderationsforlevelingofhorizontalfurnaces.
• Ensure upflow or horizontal furnaces are not installed
directlyoncarpeting,oranyothercombustiblematerial.
Theonlycombustiblematerialallowediswood.
• Exposuretocontaminatedcombustionairwill resultin
safetyandperformance-relatedproblems. Donotinstall
thefurnace wherethecombustionairisexposedtothe
followingsubstances:
permanentwavesolutions
carbontetrachloride
deicingsaltsor chemicals
cleaningsolutions(suchasperchloroethylene)
paint removers
cementsandglues
chlorinatedwaxesorcleaners
watersofteningchemicals
halogentyperefrigerants
chlorine-basedswimmingpool chemicals
printing inks
varnishes
hydrochloricacid
antistaticfabricsofteners for clothesdryers
• Seal off a non-direct vent furnace if it is installed near
an area frequently contaminated by any of the above
substances. Thisprotectsthenon-direct vent furnace
from airborne contaminants. To ensure that the

7
enclosednon-directventfurnacehasanadequatesupply
ofcombustionair,ventfromanearbyuncontaminated
room or from outdoors. Refer to the Combustion and
VentilationAirRequirementsfordetails.
• If the furnace is used in connection with a cooling coil
unit,installthefurnaceupstreamorinparallelwiththe
coolingcoilunit. Prematureheatexchangerfailurewill
resultifthecoolingunitisplacedaheadofthefurnace.
For vertical (upflow or downflow) applications, the
minimum cooling coil width shall not be less than
furnacewidth 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.
• If the furnace is installed in a residential garage,
position the furnace so that the burners and ignition
source are located not less than 18 inches (457 mm)
above the floor. Protect the furnace from physical
damagebyvehicles.
• Ifthefurnaceisinstalledhorizontally,ensuretheaccess
doorsarenotonthe“up/top”or “down/bottom” side
ofthe 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. A tight seal should be made
between the furnace base and floor by using a
siliconerubber caulking compound or cement grout.
•Counterflow Installation over a combustible floor. If
installationoveracombustiblefloorbecomesnecessary,
use an accessory subbase (see Specification Sheet
applicableforyourmodelfordetails.) Aspecialaccessory
subbase must be used for upright counterflow unit
installations over any combustible material including
wood. Refer to subbase instructions for installation
details. Follow the instructions with the subbase for
proper installation. Do not install the furnace directly
oncarpeting,tile,orothercombustible materialother
than wood flooring. (NOTE: The subbase will not be
requiredifan airconditioningcoilis installedbetween
thesupplyairopeningonthefurnaceand the floor.)
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
precedence over clearances from the enclosure
where accessibility clearances are greater.
Installationsmustadheretotheclearancestocombustiblemate-
rials to which this furnace has been design certified. The mini-
mum clearance information for this furnace is provided on the
unit’s clearance label. These clearances must be permanently
maintained. Clearancesmustalsoaccommodateaninstallation’s
gas,electrical,and draintrapanddrain lineconnections. Ifthe
alternatecombustionairintakeorvent/flueconnectionsareused
additional clearance must be provided to accommodate these
connections. Refer to Vent/Flue Pipe and CombustionAir Pipe
fordetails.
NOTE: In addition to the required clearances to combustible
materials, a minimum of 24 inches service clearance must be
availablein front of the unit.
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 MUSTbe wood only.
*MEC96 MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
POSITION* SIDES REAR FRONT BOTTOM FLUE TOP
Counterflow 0" 0" 3" NC 0" 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. A combustible subbase
must be used for installations on combustible flooring.
*CEC96 MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
TOP
BOTTOM
TOP
BOTTOM
Figure 1

8
A furnace installed in a confined space (i.e., a closet or utility
room)musthavetwoventilationopenings withatotalminimum
free area of 0.25 square inches per 1,000 BTU/hr of furnace
inputrating.RefertoSpecificationSheetapplicabletoyourmodel
for minimum clearances to combustible surfaces. One of the
ventilation openings must be within 12 inches of the top; the
other opening must be within 12 inches of the bottom of the
confinedspace. Inatypicalconstruction,theclearancebetween
the door and door frame is usually adequate to satisfy this ven-
tilationrequirement.
EXISTING FURNACE REMOVAL
NOTE: When an existing furnace is removed from a venting sys-
tem serving other appliances, the venting system may be too
largetoproperlyventtheremainingattachedappliances.
The following vent testing procedure is reproduced from the
AmericanNationalStandard/NationalStandard of Canada for
Gas-FiredCentralFurnacesANSIZ21.47,CSA-2.3latestedition
Section 1.23.1.
The following steps shall be followed with each appliance con-
nectedtotheventingsystemplacedinoperation,whileanyother
appliancesconnectedtotheventingsystemarenotinoperation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and hori-
zontalpitch,asrequired by the National Fuel Gas Code,
ANSI Z223.1 or the Natural Gas and Propane Installa-
tion Code, CSA B149.1-15 and these instructions. De-
termine that there is no blockage or restriction, leak-
age,corrosionandother deficiencies which could cause
an unsafe condition.
3. As far as practical, close all building doors and win-
dows and all doors between the space in which the
appliance(s) connected to the venting system are lo-
cated and other spaces of the building.
4. Close fireplace dampers.
5. Turnonclothesdryers 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 ap-
pliance shall operate continuously.
7. Testfor spillage from drafthood 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 accor-
dance with the National Fuel Gas Code ANSI Z223.1/
NFPA54 and/or National Gas and Propane Installation
Code CSA B149.1-15.
9. After it has been determined that each appliance con-
nectedtothe ventingsystemproperlyventswhen tested
as outlined above, return doors, windows, exhaust
fans, fireplace dampers and any other gas burning ap-
pliance to their previous conditions of use.
Ifresizingisrequiredonanyportionoftheventingsystem,use
theappropriatetableinAppendixG in the latest edition of the
National Fuel Gas CodeANSI Z223.1 and/or CSAB149.1-15 In-
stallationCodes.
THERMOSTAT LOCATION
Thethermostatshouldbeplacedapproximatelyfivefeetfrom
theflooronavibration-free,insidewall in an area having good
air circulation. Do not install the thermostat where it may be
influencedbyanyof the following:
• Drafts,or deadspotsbehinddoors,incorners,orunder
cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
• Light fixtures or other appliances.
• Radiantheatfromafireplace.
• Concealedhotorcoldwaterpipes,orchimneys.
• Unconditioned areas behind the thermostat, such as
anoutsidewall.
Consulttheinstructions packaged withthethermostatfor
mountinginstructionsandfurtherprecautions.
C OMBUSTION & V ENTILATION A IR R EQUIREMENTS
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
Improved construction and additional insulation in buildings
have reduced heat loss by reducing air infiltration and es-
cape around doors and windows. These changes have helped
in reducing heating/cooling costs but have created a prob-
lem supplying combustion and ventilation air for gas fired
and other fuel burning appliances. Appliances that pull air
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
combustionofgas-firedappliances,therebyexposing building
occupants to gas combustion products that could include car-
bonmonoxide.
If this furnace is to be installed in the same space with other
gas appliances, such as a water heater, ensure there is an ad-
equate supply of combustion and ventilation air for the other
appliances. Refertothelatestedition of the NationalFuelGas
Code NFPA54/ANSI Z223.1 or CAN/CSAB149.1-15 Installation
Codes or applicable provisions of the local building codes for
determiningthecombustionairrequirementsfortheappliances.

9
Most homes will require outside air be supplied to the furnace
areabymeans ofventilationgrillesorducts connectingdirectly
totheoutdoorsorspaces open to the outdoorssuchasatticsor
crawlspaces.
I NSTALLATION P OSITIONS
Figure 2A
Figure 2B
Figure 2C
Figure 2D
Recommended Installation Positions
*MEC96 models may be installed upflow or horizontally with
left or right side down. *CEC96modelsmaybe installed down
floworhorizontallywithleftorright side down. Do not install
this furnace on its back. For upright upflow furnaces, return
air ductwork may be attached to the side panel(s) and/or
basepan. Forhorizontal upflow furnaces,returnairductwork
must be attached to the basepan. For both upright or hori-
zontal counterflow furnaces, return ductwork must be at-
tachedto the basepan (top end of the blower compartment).
NOTE: Ductwork must never be attached to the back of the
furnace. Referto“RecommendedInstallationPositions” figure
for appropriate installation positions, ductwork connections,
andresultingairflowarrangements.
H ORIZONTAL A PPLICATIONS & C ONSIDERATIONS
Wheninstallingafurnacehorizontally, additional consideration
mustbe given to the following:
FURNACESUSPENSION
Ifsuspendingthefurnacefromraftersorjoists,use3/8"threaded
rod and 2”x2”x1/8” angle iron as shown in the following dia-
gram. Thelength of rod willdepend on the application and the
clearancesnecessary.
If the furnace is installed in a crawl space it must be suspended
fromthefloorjoistorsupportedbyaconcretepad. Neverinstall
thefurnaceonthegroundorallowit to be exposed to water.
2" 2" 3/8" ANGLE IRON
(3 PLACES )
XX
Figure 2
FRONT COVER PRESSURE SWITCH TUBE LOCATION
When a furnace is installed horizontally with left side down,
the front cover pressure switch tube must be re-locaed to he
lower port of the collector box cover.
1. Remove tubefrom front cover pressure switch and
collector box cover.
2. Remove rubber plug from bottom collector box port
and install on top of collector box port.
3. Locate 24’’ x 1/4’’ tube in bag assembly.
4. Install one end on front cover pressure switch.
5. Route tube to lower port on collector box cover and cut
off excess tubing.

10
DRAIN TRAP AND LINES
Inhorizontalapplicationsthecondensatedraintrapissecuredto
thefurnacesidepanel,suspendingitbelowthefurnace. Amini-
mumclearanceof 5.5”below thefurnacemustbeprovided for
the drain trap. Additionally, the appropriate downward piping
slopemustbe maintained from the drain trapto the drain loca-
tion. Refer to Condensate Drain Trap and Lines for further de-
tails.Ifthedraintrapanddrainlinewill beexposedto tempera-
turesnearorbelowfreezing,adequatemeasuresmustbe taken
topreventcondensate fromfreezing.
HORIZONTAL FURNACE LEVELING
Levelingensurespropercondensatedrainagefromtheheatex-
changer. 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. The
slight tilt allows the heat exchanger condensate, generated in
therecuperatorcoil,toflowforwardtotherecuperatorcoilfront
cover.
ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS
This furnace has provisions allowing for electrical and gas line
connectionsthrougheithersidepanel. Inhorizontalapplications
the connections can be made either through the “top” or “bot-
tom” of the furnace.
DRAIN PAN
A drain pan must be provided if the furnace is installed above a
conditioned area. The drain pan must cover the entire area
underthefurnace(andairconditioning coilifapplicable).
FREEZE PROTECTION
RefertoHorizontalApplicationsandConditions-DrainTrapand
Lines.
P ROPANE G AS /H IGH A LTITUDE I NSTALLATIONS
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 .
This furnace is shipped from the factory configured for natural
gas at standard altitude. Propane gas installations require an
orificeandspring changetocompensatefortheenergycontent
differencebetweennaturalandpropanegas.
High altitude installations may require both a pressure switch
and an orifice/spring change. These changes are necessary to
compensateforthenaturalreductioninthedensityofboththe
gasfuelandthecombustionair athigheraltitude. For furnaces
being converted to LP gas, it is strongly recommended that
a LPLP03 kit also be installed. The use of this kit will prevent
the furnace from firing when the LP gas supply pressure is
too low to support proper combustion.
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’s kits for propane gas and/or high altitude instal-
lations. The indicated kits must be used to insure safe and
properfurnaceoperation. Allconversionsmustbeperformedby
aqualifiedinstaller,orserviceagency.
HIGH STAGE LOW STAGE
#45 (1)
#50 (2)
LPM-08* (1) 1.25MM (1)
LPM-30* (2) #57 (2)
*supports both Honeywell andWhite-Rodgers 2-stage valves
(1)FORUSEWITHALL MODELSEXCEPT*MEC960303ANand*MEC960302BN
(2)FORUSEWITHONLY*MEC960302BNMODEL
NATURAL 0 - 7000 NONE 3.5" w.c. 1.9" w.c. NONE
PROPANE 10.0" w.c. 6.0" w.c. NONE
GAS ALTITUDE KIT ORIFICE MANIFOLD PRESSURE PRESSURESWITCH
CHANGE
Vent/Flue Pipe&CombustionAir Pipe
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
This manual will refer to the pipe that discharges products
of combustion to the outdoors as the “vent” pipe or “flue”
pipe. The pipe that supplies air for combustion to the fur-
nace will be referred to as the “intake” pipe or “combustion
air” pipe.
Acondensinggasfurnace achieves itshighlevelofefficiencyby
extracting almost all of the heat from the products of combus-
tion and cooling them to the point where condensation takes
place. Because of the relatively low flue gas temperature and
watercondensationrequirements,PVCor ABS are typicallyused
as venting and intake pipe materials. In Canada, ABS is not
an approved vent pipe material but it is permissible to use
as combustion air pipe 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 instal-
lations in the U.S.A. and Canada. Manufacturers Installation
instructionsforthese products must be followed.Theseprod-
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 manufactured with 2" vent / intake pipe and
connectors. For furnaces requiring installation of 3" pipe,

11
the transition from 2" to 3" should be done as close to the
furnace as practically possible.
This furnace must not be connected to Type B, BW, or Lvent or
vent connector, and must not be vented into any portion of a
factorybuiltormasonrychimneyexceptwhenusedasapathway
for PVC as described later in this section. Never common vent
thisappliancewithanotherapplianceoruseaventwhichisused
bya solidfuelappliance. Do notusecommerciallyavailable“no
hubconnectors”otherthanthoseshippedwiththisproduct.
It is the responsibility of the installer to follow the manufactur-
ers’recommendationsandtoverifythatallvent/fluepipingand
connectorsarecompatiblewithfurnaceflueproducts. Addition-
ally,itistheresponsibilityoftheinstallertoensurethatallpiping
and connections possess adequate structural integrity and sup-
port to prevent flue pipe separation, shifting, or sagging during
furnaceoperation.
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT
Thisfurnaceisdualcertifiedandmaybeinstalledasanon-direct
vent (single pipe) or direct vent (dual pipe) appliance. A non-
direct vent installation requires only a vent/flue pipe, while a
directventinstallationrequiresbothavent/fluepipeandacom-
bustion air intake pipe. Refer to the appropriate section for
details concerning piping size, length, number of elbows, fur-
naceconnections,andterminations.
MATERIALS AND JOINING METHODS
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
Two-three-inchnominaldiameterPVCSchedule40pipemeet-
ing ASTM D1785, PVC primer meeting ASTM F656, and PVC
solvent cement meetingASTM D2564 specifications must be
used. Fittings must be DWV type fittings meeting ASTM
D2665 andASTM D3311. Carefully follow the manufacturer’s
instructions for cutting, cleaning, and solvent cementing of
PVC.
The use of Schedule 40 PVC cellular core DWV meetingASTM
F891-1 orABS 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 meeting
ASTM 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; field supplied PVC venting mate-
rials must be UL S636 listed. NOTE: Requirement does not
apply to the combustion air pipe.
As an alternative to PVC pipe, primer, solvent cement, and fit-
tings,ABSmaterialswhichareincompliancewiththe following
specificationsmaybe used. Two-or-three-inchABS Schedule 40
pipe must meet ASTM D1527 and, if used in Canada, must be
CSA listed. Solvent cement for ABS to ABS joints must meet
ASTM D2235 and, if used in Canada, must be CSA listed. The
solvent cement for the PVC to ABS transition joint must meet
ASTM D3138. Fittings must be DWV type fittings meetingASTM
D2661 and ASTM D3311 and, if used in Canada, must be CSA
listed. Carefullyfollowthe manufacturers’instructionsforcut-
ting,cleaning,and solvent cementing PVC and/orABS.
All 90° elbows must be medium radius (1/4 bend DWV) or long
radius (Long sweep 1/4 bend DWV) types conforming to ASTM
D3311. Amedium radius (1/4 bend DWV) elbow measures 3 1/
16”minimumfromtheplaneofoneopeningtothecenterlineof
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.Thelength,diameter,andnumberofelbowsofthe
vent/fluepipeandcombustionairpipe(whenapplicable)affects
theperformanceofthefurnaceandmustbecarefullysized. All
pipingmustbeinstalledinaccordancewithlocalcodesandthese
instructions.
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
Figure 4
TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
ACCEPTABLE
Figure 5

12
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAPAND
RESTRICTS FLUE
GASES
Figure 6
Piping must be adequately secured and supported to prohibit
sagging,joint separation,and/ordetachment fromthefurnace.
Horizontalrunsofvent/fluepipingmustbesupportedeverythree
to five feet and must maintain a 1/4 inch per foot downward
slope,backtowards thefurnace,toproperly returncondensate
to the furnace’s drain system. Allowances should be made for
minorexpansionandcontractionduetotemperaturevariations.
For this reason, particular care must be taken to secure piping
when a long run is followed by a short offset of less than 40
inches.
Precautions should be taken to prevent condensate from freez-
inginside thevent/fluepipeand/oratthevent/fluepipetermi-
nation. All vent/flue piping exposed to freezing temperatures
below35°Fforextendedperiodsof timemustbeinsulatedwith
1/2” thick closed cell foam. Also all vent/flue piping exposed
outdoors in excess of the terminations shown in this manual (or
inunheated areas)mustbeinsulatedwith1/2” thickclosedcell
foam. Inspect piping for leaks prior to installing insulation.
TERMINATION LOCATIONS
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.
Vent Termination Clearances
Figure 7
NOTE: RefertoLocationRequirementsandConsiderationsfor
combustionaircontaminant restrictions.
Thefollowingbulletsanddiagramdescribe therestrictionscon-
cerningtheappropriatelocation of vent/fluepipeandcombus-
tion air intake pipe (when applicable) terminations. Refer to
Non-DirectVent(SinglePipe)Pipingand Direct Vent (DualPipe)
Piping located in this section for specific details on termination
construction.
• All terminations (flue and/or intake) must be located
atleast12inchesabovegroundlevelortheanticipated
snowlevel.
• Vent terminations (non-direct and direct vent) must
terminate at least 3 feet above any forced air inlet
locatedwithin 10feet.
NOTE: Thisprovisiondoesnotapplytothe combustion
airintake termination of a direct vent application.
• The vent termination of a non-direct vent application
mustterminateatleast4feetbelow,4feethorizontally
from, or 1 foot above any door, window, or gravity air
inletintoanybuilding.
• Theventtermination ofadirectventapplicationmust
terminateatleast12inches from any opening through
whichfluegasesmayenterabuilding(door,window,or
gravity air inlet).
• Theventterminationofventpiperunverticallythrough
aroofmustterminateatleast12inchesabove theroof
line (or the anticipated snow level) and be at least 12
inchesfromanyverticalwall(includinganyanticipated
snowbuildup).
• A vent termination shall not terminate over public
walkways or over an area where condensate or vapor
couldcreateanuisanceorhazardorcouldbedetrimental
to the operation of regulators, relief valves, or other
equipment.
• Thecombustionair intaketerminationofadirect vent
application should not terminate in an area which is
frequentlydustyordirty.
NOTE: InCanada,the current edition of CAN/CSA B149.1-15
takesprecedenceovertheprecedingterminationdescription.
CANADIAN VENT PIPE & COMBUSTION AIR PIPE REQUIRE-
MENTS
All installations in Canada must conform to the requirements
of CAN/CSAB149.1-15 code.All vent components,including
primer and cement, must be listed to ULC S636. The certi-
fied pipe and fittings should be clearly marked with the
ULC standard “S636”. The primer and cement used must be
of the same manufacturer as the vent system. For Royal
Pipe System 636; use GVS-65 Primer (Purple) and GVS-65
PVC Solvent Cement. For IPEX System 636, use PVC/CPVC
Primer, Purple or clear. Use PVC Solvent Cement (Gray). For
Canadian installations, ABS may be used as a combustion
airpipe only.ABS is not an approved vent material in Canada.
If ABS is used as a combustion air pipe, it must be CSA
certified.Always follow the manufacturer’s instructions in
the use of primer and cement. Do not use primer and ce-
ment around potential sources of ignition. Do not use primer
or cement beyond its expiration date. The safe operation,
as defined by ULC S636, of the vent system is based on
following these installation instructions, the vent system
manufacturer’s installation instructions, and proper use of
primer and cement. It is recommended under this standard,
that the vent system be checked once a year by qualified

13
service personnel.All fire stops and roof flashings used with
this system must be ULlisted. Acceptability under CAN/CSA
B149.1-15 is dependent upon full compliance with all instal-
lation instructions. Consult the authority having jurisdic-
tion (gas inspection authority, municipal building depart-
ment, fire department, etc.) before installation to deter-
mine the need to obtain a permit. *IPEX System 636™ is a
trademark of IPEX Inc. Carefully follow the pipe manufac-
turers’ instructions for cutting, cleaning, and solvent ce-
menting PVC and/or ABS. The vent can be run through an
existing unused chimney provided the space between the
vent pipe and the chimney is insulated and closed with a
weather-tight, corrosion-resistant flashing.
STANDARD FURNACE CONNECTIONS
It is the responsibility of the installer to ensure that the piping
connectionstothe furnacearesecure,airtight, andadequately
supported.
VENT/FLUEPIPE
The vent pipe outlet is sized to accept 2” pipe. Secure vent/
fluepipedirectlyinto 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. Combustion Air and Vent piping
should be routed in a manner to avoid contact with refriger-
ant lines, metering devices, condensate drain lines, etc. If
necessary, clearances may be increased by creating an offset
using two 45 degree elbows. This joint can be rotated on the
fitting to establish maximum clearance between refrigerant
lines,meteringdevices, and condensate drain lines, etc. This
jointis the equivalent of one 90 deg. elbow when considering
elbow count. (Figure 8A)
45 DEGREE
LONG-SWEEP
ELBOWS
V
E
N
T
Increased Clearance Configuration
Figure 8A
NOTE: For non-direct vent installations, a minimum of one
90° elbow should be installed on the combustion air intake
coupling to guard against inadvertent blockage.
DIRECTVENTINSTALLATIONS
E DGES OF SHEET METAL HOLES MAY BE SHARP . U SE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .
WARNING
Onupflow unitssecurethe combustionairintake pipe totheair
intakecoupling by using a take apart rubber coupling supplied
with the furnace or a plastic coupling. Also, the intake cou-
pling 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. Oncounterflowunitssecurethecom-
bustionairintakepipetotheairintakecouplingusingtherubber
couplingandwormgearhoseclampsprovidedwiththeunit.The
counterflowrubber couplingallowsserviceremovalofairintake
piping internal to the furnace blower compartment. The com-
bustion air intake pipe can also be secured directly to the
counterflowunit airintakepipecoupling.
COMBUSTION AIR INTAKE OPTIONS: The RF000142 coupling
can be secured directly to the furnace intake coupling if con-
densation is a concern. If the RF000142 is used on the com-
bustion 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. (Figure 8B) Atee installed in
the intake pipe is also an acceptable method of catching
condensation. It must have a field supplied, trapped drain
tube or pipe, free-draining to proper condensate disposal
location. A loop in the drain tube can serve as a trap.
VENT-DRAIN
The RF000142 Coupling
Figure 8B
NON-DIRECTVENTINSTALLATIONS
Aminimumofone90°elbowshouldbeinstalledonthecombus-
tion air intake “coupling” to guard against inadvertent block-
age.
ALTERNATE VENT/FLUE LOCATION
On upflow models, thealternatevent/fluelocationisthelarge
holedirectly inlinewiththeinduceddraft bloweroutlet. Touse
thealternatevent/fluelocationrefertothefollowingsteps and
the“Alternate Vent/FlueLocation” figure.

14
CUTHERE
Vent/Flue Pipe Cuts
Figure 10
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
12345678
2 7570656055504540
3 114 107 100 93 86 79 72 65
2 7570656055504540
3 114 107 100 93 86 79 72 65
2 100 95 90 85 80 75 70 65
3 168 161 154 147 140 133 126 119
2 5045403530252015
3 143 136 129 122 115 108 101 94
2 6055504540353025
3 113 106 99 92 85 78 71 64
2 6055504540353025
3 120 113 106 99 92 85 78 71
2 4540353025201510
3 103 96 89 82 75 68 61 54
2 4540353025201510
3 151 144 137 130 123 116 109 102
*MEC961205DN 3 185 178 171 164 157 150 143 136
2 100 95 90 85 80 75 70 65
3 110 103 96 89 82 75 68 61
2 4540353025201510
3 110 103 96 89 82 75 68 61
2 353025201510 5NA
3 103 96 89 82 75 68 61 54
2 4540353025201510
3 110 103 96 89 82 75 68 61
*MEC96/*CEC96 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe) (6)
Maximum Allowable Length of Vent/Flue Pipe
MODEL Pipe Size
(4) (in.)
Number of Elbows (3) (5)
*MEC960303AN
&
*MEC960403AN
*MEC960603AN
*MEC960302BN
&
*MEC960402BN
*MEC960603BN^
*MEC960803BN
*MEC960804CN
*MEC961004CN
*MEC961005CN
*CEC960403BN
*CEC960603BN
*CEC960803BN
*CEC961005CN
^ *MEC960603BN-add 45' of 2" pipe for upflow.
2.5" pipe may be used instead of 2" pipe.
For installations at or above 7,000 altitude use 3"
venting (and combustion air pipe if applicable)
NOTE: In the horizontal left installation position, a means of
condensate 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.
Insert flange. Cut 2 ½” long.
R 000142F
Figure 9
*MEC96/*CEC96 Direct Vent (2-Pipe) and Non-Direct Vent (1-Pipe)
1. Maximum allowable limits listed on individual lengths for inlet and
flue and NOT a combination.
2. Minimum requirement for each vent pipe if five (5) feet in length
and one elbow/tee.
3. Tee used in the vent/flue termination must be included when
determining the number of elbows in the piping system.
4. 2 1/2” or 3” diameter pipe can be used in place of 2” diameter
pipe.
5. Increased Clearance Configuration using (2) 45 deg. Long Sweep
elbows should be considered equivalent to one 90 deg. elbow.
6. One 90° elbow should be secured to the combustion air intake
connection.

15
ALTERNATE COMBUSTION AIR PROVISION
(Upflow / Horizontal models only)
When using the alternate venting location, either in a hori-
zontal left side down installation or a vertical installation
using down – venting, an alternate combustion air opening
can be used.Alocating dimple is located on the right side of
the furnace cabinet. The locating dimple is 1 7/8" mea-
sured from the front edge of the cabinet in line with the
knock out.To use the alternate combustion 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).
4. Use a knockout tool to create a 3" diameter hole
5. Install combustion air flange and secure with screws
removed in step one.
B E SURE NOT TO DAMAGE INTERNAL WIRING OR OTHER COMPONENTS
WHEN REINSTALLING COUPLING AND SCREWS .
CAUTION
NON-DIRECT VENT (SINGLE PIPE)PIPING
Non-directvent installations requireonlyavent/flue pipe. The
ventpipecanberunhorizontallywith anexitthroughthesideof
thebuildingorrunverticallywithanexitthrough theroofofthe
building. The vent can also be run through an existing unused
chimney;however,itmustextendaminimumof12inchesabove
thetopofthechimney. Thespacebetweentheventpipeandthe
chimney must be closed with a weather-tight, corrosion-resis-
tant flashing.
Althoughnon-directventinstallationsdonotrequirea combus-
tion air intake pipe, a minimum of one 90° elbow should be
attached to the furnace’s combustion air intake if: an upright
installation uses the standard intake location, or a horizontal
installationusesthealternateairintakelocation. Thiselbowwill
guard against inadvertent blockage of the air intake.
VentPipe
Use alternate vent
& combination
air locations
Combustion Air Pipe
Field Supplied
Drain Tee on Vent Pipe
Condensatetrapped
to prevent flue gas fromescaping
and routed to field supplied
condensate disposal
1/4” per foot min.
slopeto furnace
6’ Max.
Floor
Basement/Crawlspace
DOWN VENTING UPFLOW MODEL FURNACES ONLY
All piping and fittings must be joined per material manufacturers specifications
to prevent separation and flue gas leaks.
Figure 12

16
VENT/FLUE PIPE LENGTHS AND DIAMETERS
For installations at or above 7,000 feet altitude, use 3” vent-
ing. Refer to the following table for applicable length, elbows,
andpipediameterforconstructionofthevent/fluepipesystem
of a non-direct vent installation. In addition to the vent/flue
pipe,a single90°elbowshouldbesecuredtothecombustionair
intake to prevent inadvertent blockage. The tee used in the
vent/flue termination must be included when determining the
number of elbows in the piping system.
COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
TEE (OPTIONAL)
96”MAX.-3”MIN.
ROOFLINE
12” MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKEAND VENT
12” MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL
Figure 12
STRAIGHT
ELBOWS
Figure 13
VENT/FLUE TEE (
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
OPTIONAL)
12" MIN. ABOVE
HIGHESTANTICIPATED
SNOW LEVEL
12" MIN.
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
Figure 14
VENT/FLUE PIPE TERMINATIONS
NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
The vent/flue pipe may terminate vertically, as through a roof,
orhorizontally,asthroughanoutsidewall.
Vertical vent/flue pipe terminations should be as shown in the
following figure. Refer to Vent/Flue Pipe and Combustion Air
Pipe - Termination Locations for details concerning location re-
strictions. Thepenetration ofthevent throughtheroof mustbe
sealed tight with proper flashing such as is used with a plastic
plumbingvent.
Horizontalvent/fluepipeterminationsshouldbeasshowninthe
following figure. Refer to Vent/Flue Pipe and Combustion Air
Pipe. To secure the pipe passing through the wall and prohibit
damagetopipingconnections,acouplingshouldbeinstalledon
eithersideofthe wall and solvent cemented to alengthofpipe
connectingthetwocouplings. Thelengthof pipe should be the
wallthicknessplusthedepthofthesocketfittingstobeinstalled
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.).
DIRECT VENT (DUAL PIPE) PIPING
Direct vent installations require both a combustion air intake
andavent/fluepipe. Thepipesmayberunhorizontallyandexit
throughthesideofthebuildingorrunverticallyandexitthrough
theroofof thebuilding. Thepipesmaybe runthroughanexist-
ingunused chimney; however, they must extend a minimum of
12inchesabovethetopofthechimney. Thespacebetweenthe
pipes and the chimney must be closed with a weather tight,
corrosionresistantflashing. Boththecombustionair intakeand
avent/fluepipeterminationsmustbeinthesameatmospheric
pressure zone. Refer to Vent/Flue and Combustion Air Pipe -
Termination Locations or Concentric Vent Termination for spe-
cificdetails onterminationconstruction. For detailsconcerning
connection of pipes to the furnace, refer to the Vent/Flue Pipe
and Combustion Pipe - Standard Furnace Connections or Alter-
nateFurnaceConnections.
The number of elbows tabulated represents the number of el-
bows and/or tees in each (Vent/Flue & CombustionAir Intake)
pipe. Elbows and/or tees used in the terminations must be in-
cluded when determining the number of elbows in the piping
systems.
If the combustion air intake pipe is to be installed above a fin-
ishedceilingor otherareawheredrippingof condensatewillbe
objectionable,insulation of the combustionair pipe may be re-
quired. Use 1/2” thick closed cell foam insulation such as
Armaflex™orInsultube™whererequired.

17
90º OR 45°
ELBOW
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
6” MAX
10”- 24”
4” MIN
Standard Horizontal Terminations (Dual Pipe)
Figure 15
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3” - 24”
Alternate Horizontal Vent Termination (Dual Pipe)
Figure 16
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3”-24” BETWEEN PIPES
Combustion Air Intake may also be snorkeled to obtain 12” min ground
clearance.
Alternate Vent Termination Above Anticipated Snow Level
(Dual Pipe)
Figure 17
VENT/FLUE AND COMBUSTION AIR PIPE TERMINATIONS
The vent/flue and combustion air pipes may terminate verti-
cally, as through a roof, or horizontally, as through an outside
wall.
Vertical pipe terminations should be as shown in the following
figure. Referto Vent/FluePipeandCombustionPipe-Termina-
tion Locations for details concerning location restrictions. The
penetrations through the roof must be sealed tight with proper
flashing such as is used with a plastic plumbing vent.
Vent & CombustionAir Intake Measurements for Standard
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 clearance to ground
or anticipated snow level = 12” min.
VENT/INTAKE TERMINATIONS FOR INSTALLATION OF MULTIPLE
DIRECT VENT FURNACES
Ifmore than one directvent furnace is to be installed vertically
throughacommonrooftop,maintainthesameminimumclear-
ances between the exhaust vent and air intake terminations of
adjacent units as with the exhaust vent and air intake termina-
tions of a single unit.
If more than one direct vent furnace is to be installed horizon-
tallythrougha commonsidewall,maintainthe clearancesasin
thefollowingfigure.Alwaysterminateallexhaustventoutletsat
the same elevation and always terminate all air intakes at the
same elevation.
3” MIN
12” MIN TO GRADE OR HIGHEST
ANTICIPATED SNOW LEVEL
12” MIN SEPARATION
3”MIN
24”MAX
Termination of Multiple Direct Vent Furnaces
Figure 18

18
CONCENTRIC VENT TERMINATION
Refer to the directions provided with the Concentric Vent Kit
(CVENT)forinstallationspecifications.
SIDE WALL VENT KIT
This kit is to be used with 2” or 3” direct vent systems. The
vent kit must terminate outside the structure and may be in-
stalledwith theintakeandexhaustpipeslocatedside-by-sideor
with onepipe abovetheother.These kits are NOT intendedfor
usewithsinglepipe(non-directvent) installations.
Refertothe directions furnished with theSideWall VentKit
(p/n 0170K00000S or 0170K00001S)for installation speci-
fications.
Vertical Installation
HorizontalInstallation
Side Wall Vent Kit
Figure 19
C ONDENSATE D RAIN L INES & D RAIN T RAP
Acondensinggasfurnace achieves itshighlevelofefficiencyby
extracting heat from the products of combustion to the point
where condensationtakes place. Thecondensate must be col-
lected in the furnace drain trap and routed to an appropriate
drain location in compliance with local and national codes.
Follow the bullets listed below when installing the drain sys-
tem. Refer to the following sections for specific details con-
cerning furnace drain trap installation and drain hose hook
ups.
• The drain trap supplied with the furnace must be
used.
• The drain trap must be primed at time of
installation.
• The drain line between furnace and drain location
must meet local and national codes.
• The drain line between furnace and drain location
must maintain a 1/4 inch per foot downward slope
toward the drain.
• Do not trap the drain line in any other location
than at the drain trap supplied with the furnace.
• If the drain line is routed through an area which
may see temperatures near or below freezing,
precautions must be taken to prevent condensate
from freezing within the drain line.
• 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, to relieve
positive air pressure from the coil’s plenum. This
is necessary to prohibit any interference with the
function of the furnace’s drain 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. 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 posi-
tion. 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 installa-
tions, 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 condi-
tioning coil drain is connected to the field supplied furnace
drain,itmust be vented with an opentee 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 became blocked.

19
#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.
E DGES OF SHEET METAL HOLES MAY BE SHARP . U SE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .
WARNING
HIGH VOLTAGE !
T O AVOID THE RISK OF INJURY , ELECTRICAL SHOCK OR
DEATH , THE FURNACE MUST BE ELECTRICALLY
GROUNDED IN ACCORDANCE WITH LOCAL CODES OR IN
THEIR ABSENCE , WITH THE LATEST EDITION OF THE
N
ATIONAL E LECTRIC C ODE .
WARNING
WARNING
T O AVOID THE RISK OF INJURY , ELECTRICAL SHOCK OR DEATH , THE
FURNACE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH
LOCAL CODES OR , IN THEIR ABSENCE , WITH THE LATEST EDITION OF THE
N
ATIONAL E LECTRICAL C ODE .
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
furnace cabinet. Both sides of the cabinet have two .875”
diameter 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
DRAIN EXITING RIGHT SIDE
1. Locate and Install the 45º pipe / hose drain coupling
from the outside of the cabinet (barbed end goes in
thecabinet)throughhole in therightsideofthecabinet
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. 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.

20
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
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)throughthe hole in the left sideofthe 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 ½” clearance is required for the drain trap
beneath the furnace.
1. Remove the clamps from both ends of the drain hoses.
2. Remove the two screws 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.
5. (Draining the Vent Elbow) Locate hose #2 (factory
installed) 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.
6. For models DM96VE0303AN, DM96VE0403AN and
DM96VE0603AN; locate the hose #2 (factory installed) and
cut 1.5” length from the end of the hose. Insert hose #2
from outside the cabinet through the cabinet drain’s hole
nearest to the top. Secure it to the barbed fitting in the
elbow with a red clamp.
7. (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.
8. 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.
9. Refer to Field Supplied Drain section for instructions on
field supplied / installed drain on outlet of furnace trap.
Hose #11
Hose #2
Figure 23
UPFLOW MODEL INSTALLED HORIZONTALLY WITH LEFT SIDE
DOWN
Minimum 5 ½” clearance is required for the drain trap
beneath the furnace.
*Also see Front Cover Pressure Switch Tube Location on
page 9
1. Remove the clamps from the two drain tubes on the
trap.
2. Remove the two screws holding the drain trap to the
blower deck.
3. Remove the trap and hoses from the blower deck .
4. Remove the two plugs from the left side of the
cabinetand install them in the blower deck.
5. (Draining the Vent Elbow) Locate hose #6. Measuring
from the non-grommet end; cut off and discard 1 ½” for