Goodman GMEC96 Operating instructions

RS6612013r7
November 2017
This manual is to be used by qualified, professionally trained HVAC technicians only. Goodman does not
assume any responsibility for property damage or personal injury due to improper service procedures or
services performed by an unqualified person. The material in this manual does not supercede manufacturers
installation and operation instructions.
Copyright© 2014 - 2017 Goodman Company, L.P.
Service Instructions
Goodman®Brand GMEC96/GCEC96
&Amana®BrandAMEC96/ACEC96
Two Stage Furnace
withmulti-speedECMMotor
®
is a registered trademark of Maytag Corporation or its related companies and
is used under license to Goodman Company, L.P., Houston, TX, USA. All rights reserved.

2
IMPORTANTINFORMATION
Prideandworkmanshipgointoeveryproducttoprovideourcustomerswithqualityproducts. Itispossible,however,
thatduringitslifetimeaproductmayrequireservice. Productsshouldbeservicedonlybyaqualifiedservicetechnician
whoisfamiliarwiththesafetyproceduresrequiredintherepairandwhoisequippedwiththeproper tools,parts,testing
instrumentsandtheappropriateservicemanual. REVIEWALLSERVICEINFORMATIONINTHEAPPROPRIATE
SERVICEMANUALBEFOREBEGINNINGREPAIRS.
IMPORTANT NOTICES FOR CONSUMERS AND SERVICERS
RECOGNIZESAFETYSYMBOLS,WORDSANDLABELS
TABLEOFCONTENTS
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY
BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
IMPORTANTINFORMATION ...............................3
PRODUCTIDENTIFICATION ..............................5
FURNACESPECIFICATIONS...............................9
OPERATIONINSTRUCTIONS............................10
SYSTEMOPERATION. .....................................11
ACCESSORIES.................................................44
SERVICING TABLE OF CONTENTS..................48
SERVICING ........................................................49
MAINTENANCE ..................................................66
WIRINGDIAGRAMS ....................................70 -72
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 .

3
IMPORTANTINFORMATION
To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased this
product. For further assistance, please contact:
CONSUMERINFORMATIONLINE
GOODMAN®BRAND PRODUCTS
TOLLFREE
1-877-254-4729(U.S. only)
email us at:
[email protected]
fax us at: [phone]
(Not a technical assistance line for dealers.)
CONSUMERINFORMATIONLINE
AMANA®BRANDPRODUCTS
TOLLFREE
1-877-254-4729(U.S. only)
email us at:
hac.consumer[email protected]
fax us at: [phone]
(Not a technical assistance line for dealers.)
Outside the U.S., call 1-713-861-2500.
(Not a technical assistance line for dealers.) Your telephone company will bill you for the call.
B10259-216
CO can cause serious illness including permanent brain
damage ordeath.
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 MONOXYDE DE CARBONE
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 appareilproduisant du monoxyde
de carbone continue de fonctionner au sein de la zone confinée.

4
IMPORTANT INFORMATION
RO B INE T AGA
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M A N U ALG A S
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PRODUCT IDENTIFICATION
5
Themodelandmanufacturingnumberareusedforpositiveidentificationofcomponentpartsusedinmanufacturing.
Pleaseusethesenumberswhenrequestingserviceorpartsinformation.
* M E C 96 60 3 B N A A
12345,67,8,91011121314
Brand Minor Revision
A - Amana ®Brand A - Initial Release
G - Goodman ®Brand B - 1st Revision
Configuration Major Revision
M- Upflow / Horizontal A - Initial Release
C - Downflow / Horizontal B - 1st Revision
Motor NOx
V - Variable Speed ECM/ ComfortNet N - Low NOx
E - Multi-Speed ECM
S - Single Speed Cabinet Width
A - 14"
Gas Valve B - 17.5"
M - Modulating C - 21"
C - 2 Stage D - 24.5"
S - Single Stage Maximum CFM
AFUE 2 - 800 CFM
96 - 96% AFUE 3 - 1200 CFM
92 - 92% AFUE 4 - 1600 CFM
5 - 2000 CFM
MBTU/h
040 - 40,000 BTU/h
060 - 60,000 BTU/h

PRODUCT IDENTIFICATION
6
MODEL # MFG.# DESCRIPTION
AMEC960402BNAA
AMEC960603BNAA
AMEC960803BNAA
AMEC961004CNAA
AMEC961205DNAA
Amana®Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Up
flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECMmotor.
Stainless Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas.
AMEC960302BNAB
AMEC960402BNAB
AMEC960603BNAB
AMEC960803BNAB
AMEC961004CNAB
AMEC961205DNAB
AMEC960804CNAB
AMEC961005CNAB
Amana®Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Up
flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECMmotor.
Stainless Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas.
AMEC960303ANAA
AMEC960403ANAA
AMEC960603ANAA
AMEC960302BNAC
AMEC960402BNAC
AMEC960603BNAC
AMEC960803BNAC
AMEC960804CNAC
AMEC961004CNAC
AMEC961005CNAC
AMEC961205DNAC
Amana®Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Up
flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECMmotor.
Stainless Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas.
Control board changed from PCBBF137 to PCBBF139. New control feature gives
installer multiple choices for constant fan mode.
GMEC960402BNAA
GMEC960603BNAA
GMEC960803BNAA
GMEC961004CNAA
GMEC961205DNAA
Goodman®Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Up
flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECMmotor.
Stainless Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas.
GMEC960302BNAB
GMEC960402BNAB
GMEC960603BNAB
GMEC960803BNAB
GMEC961004CNAB
GMEC961205DNAB
GMEC960804CNAB
GMEC961005CNAB
Goodman®Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Up
flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECMmotor.
Stainless Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas.
For Control board part # change to PCBBF137 with heat speed DIP switches.
GMEC960303ANAA
GMEC960403ANAA
GMEC960603ANAA
GMEC960302BNAC
GMEC960402BNAC
GMEC960603BNAC
GMEC960803BNAC
GMEC960804CNAC
GMEC961004CNAC
GMEC961005CNAC
GMEC961205DNAC
Goodman®Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Up
flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECMmotor.
Stainless Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas.
For Control board part # change to PCBBF137 with heat speed DIP switches. Control
board changed from PCBBF137 to PCBBF139. New control feature gives installer
multiple CFM choices for constant fan mode.
AMEC96
GMEC96

PRODUCT IDENTIFICATION
7
MODEL # MFG. # DESCRIPTION
ACEC96
ACEC960403BNAA
ACEC960603BNAA
ACEC960803BNAA
ACEC961005BNAA
Amana ®Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Counter
flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECM motor.
Stainless Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas.
PCBBF139 Control board which gives installer multiple CFM choices for constant fan
mode.
GCEC96
GCEC960403BNAA
GCEC960603BNAA
GCEC960803BNAA
GCEC961005BNAA
Goodman®Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Counter
flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECMmotor.
Aluminized Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right
gas. PCBBF139 Control board which gives installer multiple CFM choices for constant
fan mode.

PRODUCT IDENTIFICATION
8
MODEL # MFG # DESCRIPTION
AFE18-60A N/A Fossil Fuel Kit. The AFE18-60Acontrol is designed for use where the indoor coil is located
above/downstream of a gas or fossil fuel furnace when used with a heat pump. Itwill
operate with single and two stage heat pumps and single and two stage furnaces
AMU1620
AMU1625
AMU2020
AMU2025
GMU1620
GMU1625
GMU2020
GMU2025
P1251305F
P1251306F
P1251307F
P1251308F
N/A
Media Air Cleaner. The Amana (AMU*) and Goodman (GMU*) Media Air Cleaneris a high
efficiencyair filtration device designed to remove dirt,dust, pollen and other microscopic
particles from the air passing through it. Flexible performance range up to 2,0
ASAS-10
ASAS-11
ASAS-12
ASAS-18
P1251301F
P1251302F
P1251303F
P1251304F
Electronic Air Cleaner. The High-EfficiencyElectronic Air Cleaner is designed to remove air
contaminants down to .01 microns.Carbon filters (optional) remove odors. Dual indicator
lights show unitoperation ata glance. Electronicproving switch cycle
DCVK-20 (CVENT - 2)
DCVK-30 (CVENT - 3)
P1254001F
P1254002F
Concentric Vent Kit.For use with Amana® Brand high efficiencyfurnace models. This kitis
designed to allow terminations of a directvent furnace to be "concentrically"vented through
a wall or roof.This kitallows a single penetration to supporttermin
0170K00000S N/A Side Wall Only Concentric Vent Kit.For use with high efficiencyfurnace models. This kit is
to be used with 2" - 3"ventsystems.The ventkitmustterminate outside the structure. This
kitis NOTintended for use with single pipe (indirectvent) instal
0170K00001S N/A Side Wall Only Concentric Vent Kit.For use with high efficiency90% furnace models. This
kitis to be used with 2" onlyventsystems.The vent kitmust terminate outside the structure.
This kitis NOTintended for use with single pipe (indirectvent) in
EFR02 P1221001
P1221002F
External Filter Rack Kit.This kitis intended to provide a location,external to the furnace
casing, for installation of a permanent filter.The rack is mounted over the indoor air blower
compartmentarea ofeither side panel,and provide filter retentio
LPLP03 N/A LP Gas Low Pressure Kit.Designed for application on Goodman® and Amana® Brand's
80% and 90% single-stage and two-stage gas fired furnace products installed on LP gas
listed in this manual.This kitincludes harness adaptors to work with White-Rodgers sin
RF000142 N/A Vent Drain Coupling.For use when the furnaces is installed in horizontal leftposition and
the internal elbow is removed. Mayalso be used in the combustion air intake if
condensation is an issue.
CFSB17
CFSB21
CFSB24 N/A
Counterflow Subbase Kit. For use with Amana® Brand,Goodman®brand 96% two stage
34.5 furnace model.These kits are available for the following furnace width:17.5"wide
(CFSB17),21" wide (CFSB21,and 24"Wide CFSB21.The kitmustbe used to prevent
excessive temperature from reaching combustible materials,ifthe furnace is installed on
combustible floor. This subbase effectivelyseparated the furnace base and plenum from
combustile materials.To ensure safe installation, do not install the counterflow floor base
directlyon carpeting, tile or other combusible material other than wood flooring.

FURNACE SPECIFICATIONS
9
1Natural Gas BTU/h
2DOE AFUE based upon Isolated Combustion System (ICS)
3Installer must supply one or two PVC pipes: one for
combustion air (optional) and one for the flue outlet (required).
Vent pipe must be either 2" or 3" in diameter, depending upon
furnace input, number of elbows, length of run and installation
(1 or 2 pipes). The optional Combustion Air Pipe is dependent
on installation/code requirements and must be 2" or 3"
diameterPVC.
4Minimum Circuit Ampacity = (1.25 x Circulator Blower Amps) +
ID Blower amps. Wire size should be determined in
accordance with National Electric Codes. Extensive wire runs
will require larger wire sizes.
5Maximum Overcurrent Protection Device refers to maximum
recommended fuse or circuit breaker size. May use fuses or
HACR-type circuit breakers of the same size as noted
Notes
•All furnaces are manufactured for use on 115 VAC, 60 Hz,
single-phase electrical supply.
•Gas Service Connection 1/2" FPT
•Important: Size fuses and wires properly and make electrical
connections in accordance with the National Electrical Code
and/or all existing local codes.
•For bottom return: Failure to unfold flanges may reduce
airflow by up to 18%. This could result in performance and
noise issues.
• For servicing or cleaning, a 24" front clearance is required.
Unit connections (electrical, flue and drain) may necessitate
greater clearances than minimum clearances listed above. In
all cases, accessibility clearance must take precedence over
clearances from the enclosure where accessibility clearances
are greater.
Heating Data
High Fire Input¹ 40,000 60,000 80,000 100,000
High Fire Output¹ 38,400 57,600 76,800 96,000
Low-Fire Steady-State Input¹ 28,000 42,000 56,000 70,000
Low-Fire Steady-State Output¹ 26,880 40,320 53,760 67,200
AFUE 96 96 96 96
Temperature Rise Range (°F) 25 - 55 25 - 55 40 - 70 36 - 65
Vent Diameterᶾ2" - 3" 2" - 3" 2" - 3" 2" - 3"
No.ofBurners 2345
CirculatorBlower
Available AC @ 0.5 ESP 1.5 - 3 1.5 - 3 1.5 - 3 3 - 5
Size (D x W) 10 x 8 10 x 8 11 x 8 11 x 10
Horsepower @ 1075 RPM 1/2 1/2 1/2 1 HP
Speed 5555
Electrical Data
Min. Circuit Ampacity⁴88813.3
Max. Overcurrent Device (AMPS)⁵15 15 15 15
*CEC96
0403BNAA
*CEC96
0603BNAA
*CEC96
0803BNAA
*CEC96
1005CNAA
*MEC96
0303ANA *MEC96 0403ANA *MEC96 0603ANA *MEC96 0302BNA *MEC96 0402BNA *MEC96 0603BNA *MEC96 0803BNA *MEC96 1004CNA *MEC96 1205DNA *MEC96 0804CNA *MEC96 1005CNA
Heating Data
High Fire Input¹ 30,000 40,000 60,000 30,000 40,000 60,000 80,000 100,000 120,000 80,000 100,000
High Fi re Output¹ 28,800 38,400 57,600 28,800 38,400 57,600 76,800 96,000 115,200 76,800 96,000
Low-Fire Steady-State Input¹ 21,000 28,000 42,000 21,000 28,000 42,000 56,000 70,000 84,000 56,000 70,000
Low-Fi re Stea dy-State Output¹ 20,160 26,880 40,320 20,160 26,880 40,320 53,760 67,200 80,640 53,760 67,200
AFUE² 9696969696969696969696
Tempe rature Ris e Range (°F) 20 - 50 20 - 50 30 - 60 20 - 50 20 - 50 25 - 55 35 - 65 35 - 65 35 - 65 25 - 55 35 - 65
Ve nt Di ameter³ 2" - 3" 2" - 3" 2" - 3" 2" - 3" 2" - 3" 2" - 3" 2" - 3" 2" - 3" 2" - 3" 2" - 3" 2" - 3"
No.ofBurners 22322345645
Circulator Blower
Avai lable AC @ 0.5” ESP 1.5 - 3 1.5 - 3 1.5 - 3 1.5 - 2 1.5 - 3 1.5 - 3 1.5 - 3 1.5 - 4 3 - 5 2.5 - 4 3 - 5
Size (D x W) 11" x 6" 11" x 6" 11" x 6" 10" x 8" 10" x 8" 11" x 8" 11" x 8" 11" x 10" 11" x 11" 11" x 10" 11" x 10"
Horse powe r @ 1075 RPM 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1 1 3/4 1
Speed 55555555555
Electrical Data
Min. Circuit Ampacity48.6 8.6 8.6 8 8 8 8 13.3 13.3 11.6 13.3
Max. Overcurrent Device (amps)515 15 15 15 15 15 15 15 15 15 15
Shipping Weight (lbs) 106 107 110 111 112 115 118 140 154 123 140

OPERATIONS INSTRUCTIONS
10
Introduction
Thisisa Category lV furnace. This furnace usesa pressur-
izedventingsystemandmustbeinstalledper National and
local codes requirements and the installation manual that
wasshippedwiththefurnace.
The *MEC96 34.5" furnace is one of the products in our
newlyredesigned lineofshorterchassis furnaces. Itisavail-
ableinthefollowingsizesandsuitableforupflow/horizon-
tal installation.
*MEC960303ANA *CEC960402BNAA
*MEC960403ANA *CEC960603BNAA
*MEC960603ANA *CEC960803BNAA
*MEC960302BNA *CEC961005CNAA
*MEC960402BNA Suitable for counter
*MEC960603BNA flow or horizontal
*MEC960803BNA installation.
*MEC960804CNA
*MEC961004CNA
*MEC961005CNA
*MEC961205DNA
Safety
Pleaseadhere to the following warnings andcautionswhen
installing,adjusting,altering,servicing,oroperating the fur-
nace.
TO PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER INSTALLATION,
ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE, REFER TO THIS
MANUAL. FOR ADDITIONAL ASSISTANCE OR INFORMATION, CONSULT A
QUALIFIED INSTALLER, SERVICE AGENCY OR THE GAS SUPPLIER.
WARNING
WARNING
THIS PRODUCT CONTAINS OR PRODUCES A CHEMICAL OR CHEMICALS WHICH
MAY CAUSE SERIOUS ILLNESS OR DEATH AND WHICH ARE KNOWN TO THE
STATE OF CALIFORNIA TO CAUSE CANCER, BIRTH DEFECTS OR OTHER
REPRODUCTIVE HARM.
WARNING
TO PREVENT POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH
DUE TO ELECTRICAL SHOCK, THE FURNACE MUST BE LOCATED TO PROTECT
THE ELECTRICAL COMPONENTS FROM WATER.
Charge(ESD)Precautions
NOTE: Discharge body’s static electricity before touching
unit.Anelectrostaticdischargecanadverselyaffectelectri-
calcomponents.
Usethefollowingprecautionsduringfurnaceinstallation and
servicingto protect theintegratedcontrolmodule from dam-
age. By putting the furnace, the control, and the person at
thesameelectrostatic potential, these steps will help avoid
exposingtheintegrated control module to electrostatic dis-
charge. This procedure is applicable to both installed and
uninstalled(ungrounded)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
chargeto ground.
2. Firmly touch a clean, unpainted, metal surface of the
furnace near the control. Any tools held in a person’s
handduring grounding will be discharged.
3. Service integrated control module or connecting wiring
following the discharge process in Step 2. Use caution
nottorecharge your body with static electricity;(i.e., do
notmove or shuffle your feet,do nottouch ungrounded
objects,etc.). Ifyoucomein contactwithanungrounded
object,repeat Step 2 before touching control orwires.
4. Dischargeany static electricityfromyour body toground
beforeremoving a newcontrolfromits container. Follow
Steps 1 through 3 if installing the control on a furnace.
Returnany old ornewcontrolsto their containers before
touchinganyungrounded object.
Product Application
This product is designed for use as a residential home gas
furnace.Itisnot designedorcertified foruse inmobile home,
trailer,orrecreationalvehicle applications.
This furnace can be used in the following non-industrial
commercial applications: Schools, Office buildings, Churches,
Retail stores, Nursing homes, Hotels/motels, Common or
office areas. In such applications, the furnace must be installed
with the installation instructions.
The*MEC96furnacesare ETL certified appliances and are
appropriate for use with natural or propane gas. (NOTE: If
usingpropanegas,apropaneconversionkitisrequired).
*MEC96furnacesare dual certified.
Dualcertificationmeans that the combustion air inlet pipeis
optionalandthe furnace can be vented as a:
Non-directvent (singlepipe)central forcedairfurnace
in which combustion air is taken from the installation
areaor from air ducted from the outsideor,
Directvent(dualpipe)centralforcedairfurnaceinwhich
allcombustionairsupplieddirectlytothe furnaceburn-
ers through a special air intake system outlined in
this manual and the installation instructions.
Toensureproper installation, operation and servicing, thor-
oughlyreadtheinstallationand service manuals for specif-
icspertainingto the installation, servicing and application of
this product.
WARNING
POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE,
EXPLOSION, SMOKE, SOOT, CONDENSTAION, ELECTRICAL SHOCK OR CARBON
MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION, REPAIR, OPERATION,
OR MAINTENANCE OF THIS PRODUCT.

11
SYSTEM OPERATION
WARNING
TO PREVENT PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE,
DO NOT INSTALL THIS FURNACE IN A MOBILE HOME, TRAILER, OR RECREATIONAL
VEHICLE.
Toensureproperfurnaceoperation,install,operate,main-
tainand service the furnaceinaccordancewiththe installa-
tion, operation and service instructions, all local building
codes and ordinances. In their absence, follow the latest
edition of the National Fuel Gas Code (NFPA 54/ANSI
Z223.1), and/or CAN/CGA B149 Installation Codes, local
plumbingorwastewater codes,and otherapplicablecodes.
A copy of the National Fuel Gas Code (NFPA 54/ANSI
Z223.1)canbeobtainedfromanyofthe following:
American National Standards Institute
25 West 43rd Street, 4th Floor
New York, NY 10036
National Fire Protection Association
1 Batterymarch Park
Quincy,MA 02169-7471
CSA International
8501 East Pleasant Valley
Cleveland,OH 44131
A copy of the CAN/CGA B149 Installation Codes can be
obtainedfrom:
CSA International
178RexdaleBoulevard
Etobicoke,Ontario,CanadaM9W, 1R3
Therated heating capacity ofthefurnaceshould be greater
thanorequaltothetotalheatlossoftheareatobeheated.
The total heat loss should be calculated by an approved
methodor in accordance with“ASHRAEGuide”or “Manual
J-LoadCalculations”publishedby theAirConditioningCon-
tractors of America.
Location Requirements and Considerations
WARNING
TO PREVENT POSSIBLE EQUIPMENT DAMAGE, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH, THE FOLLOWING BULLET POINTS MUST BE OBSERVED
WHEN INSTALLING THE UNIT.
Follow the instructions listed below when selecting a fur-
nace location. Refer also to the guidelines provided in the
Combustion and Ventilation Air Requirements section in
this manual or the installation instructions for details.
• Centrally locate the furnace with respect to the pro-
posed or existing air distribution system.
• Ensure the temperature of the return air entering the
furnaceis between 55°Fand100°Fwhen the furnace
is heating.
• If the furnace is installed in an application where the
typical operating sound level of a furnace is deemed
objectionable,an optional soundreductionkitis avail-
able. Consult your local distributor for more details.
• Provide provisions for venting combustion products
outdoors through a proper venting system. Special
considerationshouldbegiven tovent/fluepipe routing
andcombustionairintake pipe when applicable.
90% Furnaces: RefertotheVent/FluePipeandCom-
bustionAir Pipe-TerminationLocations sectioninthis
manualortheinstallationinstructionsforappropriate
terminationlocations.Alsofor90% furnaces, refer to
the Vent/Flue Pipe and Combustion Air Pipe -Termi-
nation Locations section in this manual or the instal-
lation instructions to determine if the piping system
from furnace to termination can be accomplished
withintheguidelines given.
NOTE:The lengthofflueand/or combustion airpipingcan
be a limiting factor in the location of the furnace.
• Locate the 90% furnace so that the condensate can
bepipedatadownwardslopeawayfromthefurnace
to the drain. Do not locate the furnace or its conden-
sate drainage system in any area subject to below
freezing temperatures without proper freeze protec-
tion. Refer to the Condensate Drain Lines and Trap
section in this manual or the installation instructions
forfurther details.
• Setthe90%furnace on a level floor to enable proper
condensatedrainage.Ifthefloorbecomeswetordamp
at times, place the furnace above the floor on a
concretebasesized approximately 1-1/2" larger than
thebaseof the furnace. Refer to the Horizontal Appli-
cationsandConsiderations section in this manualor
the installation instructions for leveling of horizontal
furnaces.
• Ensureupflow or horizontal furnacesarenotinstalled
directlyoncarpeting,oranyothercombustiblemate-
rial.Theonly combustible material allowed is wood.
• Exposure to contaminated combustion air will result
in safety and performance-related problems. Do not
install the furnace where the combustion air is ex-
posedtothe following substances:
chlorinatedwaxesorcleaners
chlorine-basedswimmingpoolchemicals
watersofteningchemicals
deicing salts or chemicals
carbontetrachloride
halogentype refrigerants
cleaningsolutions(suchasperchloroethylene)
printinginks
paintremovers
varnishes

12
SYSTEM OPERATION
hydrochloricacid
cementsandglues
antistaticfabric softeners for clothes dryers
andmasonryacidwashing materials
• Isolateanon-directventfurnaceifitisinstallednear
anarea frequently contaminatedbyanyof the above
substances.Thisprotectsthe non-directventfurnace
from airborne contaminants. To ensure that the en-
closednon-direct vent furnacehasan adequate sup-
plyof combustion air, ventfromanearby uncontami-
nated room or from outdoors. Refer to the Combus-
tion andVentilation Air Requirements sectionin this
manual or the installation instructions for details.
• If the furnace is used in connection with a cooling
unit, install the furnace upstream or in parallel with
thecoolingunit coil. Premature heat exchanger fail-
ure will result if the cooling unit coil is placed in the
returnairofthefurnace.
• Ifthe furnace is installed ina residential garage,po-
sition the furnace so that the burners and ignition
sourceare located not less than 18inches(457mm)
abovethefloor.Protectthefurnacefromphysicaldam-
agebyvehicles.
• Ifthe furnace is installedhorizontally,thefurnace ac-
cess doors must be vertical so that the burners fire
horizontally into the heat exchanger. Do not install
theunitwiththeaccessdoorsonthe“up/top”or“down/
bottom”sideofthe furnace.
• Oncounterflowinstallations,theairconditioningcoil
mustbedownstreamonthesupply(positive)sideof
thefurnaceheat exchanger.
•CounterflowInstallation overanoncombustiblefloor.
Beforesettingthefurnaceovertheplenum opening,
ensurethesurfacearoundtheopening issmooth and
level. A tight seal should be made between the fur-
nacebase and floor byusingasiliconerubber caulk-
ingcompoundorcement grout.
•Counterflow Installation over a combustible floor. If
installationover a combustiblefloorbecomesneces-
sary,useanaccessory sub-base (see Specification
Sheetapplicablefor your model for details). A spe-
cial accessory sub-base must be used for upright
counterflow unit installations over any combustible
materialincludingwood. Refer to sub-base instruc-
tions for installation details. Follow the instructions
with the sub-base for proper installation. Do not in-
stall the furnace directly on carpeting, tile, or other
combustiblematerialotherthanwood flooring.
(NOTE: The sub-base will not be required if an air
conditioning coil is installed between the supply air
openingonthe furnace and the floor.)
POSITION* SIDES REAR FRONT BOTTOM FLUE TOP
Upflow 0" 0" 1" C 0" 1"
Horizontal 6" 0" 1" C 0" 6"
*MEC96 MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
POSITION* SIDES REAR FRONT BOTTOM FLUE TOP
Counterflow0"0"1"NC0"
Horizontal 6" 0" 1" C 0" 6"
*CEC96 MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
• 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.
• For servicing or cleaning, a 24" front clearance is recommended.
• 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 from
the enclosure where accessibility clearances are greater.
• Approved for line contact in the horizontal position.
ClearancesandAccessibility
Installationsmustadhere to the clearances to combustible
materials to which this furnace has been design certified.
Theminimumclearance information for this furnace is pro-
videdonthe unit’s clearance label. These clearances must
bepermanently maintained.Referto SpecificationSheetfor
minimumclearancestocombustible materials. Clearances
must also accommodate an installation’s gas, electrical,
and drain trap and drain line connections. If the alternate
combustionairintake or vent/flue connections are used on
a 90% furnace, additional clearances must be provided to
accommodate these connections. Refer to Vent Flue Pipe
and Combustion Air Pipe section in this manual or the in-
stallation instructions for details. NOTE: In addition to the
required clearances to combustible materials, a minimum
of24inches service clearance must be available infront of
the unit.
A furnace installed in a confined space (i.e., a closet or
utilityroom)musthavetwoventilationopeningswithatotal
minimumfreeareaof 0.25 square inches per 1,000 BTU/hr
offurnace input rating.Oneof the ventilationopeningsmust
be within 12 inches of the top; the other opening 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.

13
SYSTEM OPERATION f. Afterithasbeendeterminedthateachapplianceconnectedtothe
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;
g. Ifimproperventingis observedduringanyoftheabovetests,the
common venting system must be corrected.
Correctionsmustbeinaccordancewiththelatesteditionof
the National Fuel Gas Code NFPA 54/ANSI Z223.1 and/or
CSAB149InstallationCodes.
If resizing is required on any portion of the venting system,
usetheappropriatetableinAppendixGinthelatestedition
oftheNationalFuelGasCodeANSIZ223.1and/orCSAB149
InstallationCodes.
Thermostat Requirements
Atwo stageheat/coolthermostatis recommended. Asingle
stageheatingthermostatmay be used. It is recommended
thata high quality thermostat witha "C"terminal isusedto
operatethe furnace.
Thermostat Location
Inanarea having good air circulation, locate the thermostat
about five feet high on a vibration-free inside wall. Do not
install the thermostat where it may be influenced by any of
thefollowing:
• Drafts,ordeadspotsbehinddoors,incorners,orun-
dercabinets.
• Hot or cold air from registers.
• Radiantheatfrom the sun.
• Lightfixturesor other appliances.
• Radiantheatfrom a fireplace.
• Concealed hot or cold water pipes, or chimneys.
• Unconditioned areas behind the thermostat and de-
humidistat, such as an outside wall.
COMBUSTION AND VENTILATION AIR
REQUIREMENTS
WARNING
POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR
IF THE FURNACE IS NOT PROVIDED WITH ENOUGH FRESH AIR FOR PROPER
COMBUSTION AND VENTILATION OF FLUE GASES. MOST HOMES REQUIRE
OUTSIDE AIR BE SUPPLIED TO THE FURNACE AREA.
Improvedconstructionand additional insulation in buildings
have reduced heat loss by reducing air infiltration and es-
capearounddoorsandwindows.Thesechangeshavehelped
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.)increasethe problem by starving appliances for air.
When the furnace is installed as a direct ven (2-pipe) fur-
nace, no special provisions for air for combustion are re-
quired.However, if thisfurnaceisto be installed inthesame
space with other gas appliances, such as a water heater,
FurnaceSuspension
If suspending the furnace from rafters or joist, use 3/8"
threadedrodand2”x2”x1/8”angleironas shown in the fol-
lowing figure. If the furnace is installed in a crawl space it
mustalso be suspended fromthefloorjoistor supported by
a concrete pad. Never install the furnace on the ground or
allow it to be exposed to water. The length of rod will de-
pendon the application andthe clearancesnecessary.
TILT OUTWARD TO ALLOW FOR
DOOR AND CIRCULATOR BLOWER
REMOVAL.
3/8" DIAMETER
THREADED ROD
(6 PLACES)
PROVIDE 8" MINIMUM CLEARANCE BETWEEN
CENTER ROD AND FURNACE CABINET
TO ALLOW FOR CIRCULATOR BLOWER REMOVAL.
ASSURE FURNACE IS LEVEL FROM
END TO END.
ON 90% FURNACES MAKE SURE
THE UNIT HAS A SLIGHT
FORWARD TILT WITH THE FRONT
OF THE FURNACE 0"-3/4"
BELOW THE BACK OF THE FURNACE.
POSITION AS CLOSE AS POSSIBLE
TO BLOWER DECK TO ALLOW FOR
CIRCULATOR BLOWER REMOVAL.
2"X2"X1/8" ANGLE IRON
(3 PLACES)
HOLD DOWN
NUTS
SUPPORT
NUTS
CONDENSATE
DRAIN
GAS PIPING
ALTERNATE
GAS PIPING
90% Suspended Furnace Shown
EXISTING FURNACE REMOVAL
NOTE:When anexistingfurnace isremovedfrom aventing
system serving other appliances, the venting system may
be too large to properly vent the remaining attached appli-
ances.
The following vent testing procedure is reproduced from the
AmericanNationalStandard/NationalStandardofCanadafor
Gas-Fired Central Furnaces ANSI Z21.47, latest edition,
CSA-2.3b,latestedition Section 1.23.1.
Thefollowingsteps shallbe followedwitheach applianceconnectedto
the venting system placed in operation, while any other appliances
connected to the venting system are not in operation:
a. Seal any unused openings in the venting system;
b. Inspect the venting system for proper size and horizontal pitch,
as required by the National Fuel Gas Code, ANSI Z223.1 or the
CSAB149InstallationCodes andtheseinstructions. Determine
that there is no blockage or restriction, leakage, corrosion and
other deficiencies which could cause an unsafe condition;
c. In so far as practical, close all building doors and windows and
alldoors betweenthespacein whichthe appliance(s)connected
totheventingsystemarelocatedandotherspacesofthebuilding.
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. Close fireplace dampers;
d. Follow the lighting instructions. Place the appliance being in-
spected in operation. Adjust thermostat so appliance shall
operate continuously;
e. Test for draft hood equipped spillage at the draft hood relief
openingafter 5minutesof mainburneroperation. Usetheflame
of a match or candle;

14
SYSTEM OPERATION
ensurethereis an adequate supply of combustion and ven-
tilation air for the other appliances. Refer to the latest edi-
tion of the National Fuel Gas Code NFPA 54/ANSI Z223.1
(Section 9.3), or CAN/CGA B149 Installation Codes (Sec-
tions 7.2, 7.3, or 7.4), or applicable provisions of the local
building codes for determining the combustion air require-
mentsforthe appliances.
Most homes will require outside air be supplied to the fur-
nace area by means of ventilation grilles or ducts connect-
ing directly to the outdoors or spaces open to the outdoors
such as attics or crawl spaces.
The following information on air for combustion and ventilation
is reproduced from the NationalFuelGasCodeNFPA54/ANSI
Z223.1 Section 9.3.
9.3* Air for Combustion and Ventilation.
9.3.1 General.
9.3.1.1 Air for combustion, ventilation, and dilution of flue gases for
appliances installed in buildings shall be obtained by application of one
of the methods covered in 9.3.2 through 9.3.6. Where the requirements
of 9.3.2 are not met, outdoor air shall be introduced in accordance with
methods covered in 9.3.3 through 9.3.6.
ExceptionNo.1: This provisionshall not applytodirect ventappliances.
9.3.1.2 Appliances of other than natural draft design and other than
Category 1 vented appliances shall be provided with combustion, ven-
tilation, and dilution air in accordance with the appliance manufacturer’s
instructions.
9.3.1.3 Appliances shall be located so as not to interfere with proper
circulation of combustion, ventilation, and dilution air.
9.3.1.4 Where used, a draft hood or a barometric draft regulator shall be
installed in the same room or enclosure as the appliance served so as to
prevent any difference in pressure between the hood or regulator and the
combustion air supply.
9.3.1.5Makeupair requirementsfor theoperation ofexhaustfans, kitchen
ventilation systems, clothes dryers, and fireplaces shall be considered in
determining the adequacy of a space to provide combustion air require-
ments.
9.3.2 Indoor CombustionAir. The required volume of indoor air shall
be determined in accordance with the method in 9.3.2.1 or 9.3.2.2 ex-
cept that where the air infiltration rate is known to be less than 0.40
ACH, the method in 9.3.2.2 shall be used. The total required volume
shall be the sum of the required volume calculated for all appliances
located within the space. Rooms communicating directly with the space
in which the appliances are installed through openings not furnished
with doors, and through combustion air openings sized and located in
accordance with 9.3.2.3, are considered a part of the required volume.
9.3.2.1* Standard Method. The minimum required volume shall be 50
ft 3per 1,000/Btu/hour (4.8m3/kW).
9.3.2.2* KnownAir Infiltration Rate Method. Where the air infiltra-
tion rate of a structure is known, the minimum required volume shall be
determined as follows:
(1) For appliances other than fan-assisted, calculate using the follow-
ingequation: 21 ft3I other
Required Volume other > ________ _________
ACH 1000 Btu/hr
(2) For fan-assisted appliances, calculate using the following equation:
15 ft3I fan
Required Volume fan > ________ _________
ACH 1000 Btu/hr
where:
I other = all appliances other than fan-assisted input in Btu per
hour
I fan = fan-assisted appliances input in Btu per hour
ACH = airchange perhour(percentofvolumeofspaceexchanged
per hour, expressed as a decimal)
(3) For purposes of this calculation, an infiltration rate greater than
0.60 ACH shall not be used in the equations in 9.3.2.2(1) and
9.3.2.2(2).
9.3.2.3 Indoor Opening Size and Location. Openings used to con-
nect indoor spaces shall be sized and located in accordance with the
following:
(1)*Combining spaces on the same story. Each opening shall have a
minimum free area of 1 in.2/1000Btu/hr (2200 mm2/kW) of the total
input rating of all appliances in the space but not less than 100 in.2
(0.60m2). One opening shall commence within 12 in. (300 mm) of
the top, and one opening shall commence within 12 in. (300 mm) of
the bottom, of the enclosure [see Figure A.9.3.2.3(1)]. The mini-
mum dimension of air openings shall be not less than 3 in. (80 mm).
Furnace Water
Heater
Opening
Chimney or Gas Vent
Opening
NOTE: Each opening must have
a free area of not less than one
square inch per 1000 BTU of
the total input rating of all equip-
ment in the enclosure, but not
less than 100 square inches.
Figure A.9.2.3.3.(1) All Combustion Air from Adjacent
Indoor Spaces through Indoor Combustion Air Openings.
(2) Combining spaces in different stories.The volumes of spaces in
differentstoriesshall beconsideredas communicatingspaceswhere
such spaces are connected by one or more openings in doors or
floors having a total minimum free area of 2 in.2/1000 Btu/hr (4400
mm2/kW) of total input rating of all appliances.
9.3.3 Outdoor Combustion Air. Outdoor combustion air shall be
provided through opening(s) to the outdoors in accordance with the
methods in 9.3.3.1 or 9.3.3.2. The minimum dimension of air openings
shall not be less than 3 in. (80 mm).
()
()

15
SYSTEM OPERATION
9.3.3.1 Two Permanent Openings Method. Two permanent open-
ings, one commencing within 12 in. (300 mm) of the top and one com-
mencing within 12 in. (300 mm) of the bottom, of the enclosure shall be
provided. The openings shall communicate directly, or by ducts, with
the outdoors or spaces that freely communicate with the outdoors, as
follows:
(1)*Wheredirectlycommunicating with theoutdoors or wherecommu-
nicating to the outdoors through vertical ducts, each opening shall
have a minimum free area of 1 in.2/4000 Btu/hr (550 min2/kW) of
total input rating of all appliances in the enclosure. [See Figure
A.9.3.3.1(1)(a) and Figure A.9.3.3.1(1)(b).]
Furnace
Water
Heater
Outlet Air
Chimney or Gas Vent
NOTE: The inlet and outlet air
openings must each have a free
area of not less than one square
inch per 4000 BTU of the
total input rating of all equipment
in the enclosure.
Inlet Air
Ventilation louvers for
unheated crawl space
A
lternate
air inlet
Ventilation louvers
(each end of attic)
Figure A.9.3.3.1(1)(a) All Combustion Air From Outdoors -
Inlet Air from Ventilated Crawl Space and Outlet Air
to Ventilated Attic.
Furnace
Water
Heater
Outlet Air
Chimney or Gas Vent
NOTE: The inlet and outlet air
openings must each have a free
area of not less than one square
inch per 4000 BTU of the
total input rating of all equipment
in the enclosure.
Inlet air duct
[ends 1 ft (300 mm)
above floor]
Ventilation louvers
(each end of attic)
Figure A.9.3.3.1(1)(b) All Combustion Air
From Outdoors through Ventilated Attic.
(2)*Wherecommunicatingwith the outdoors through horizontal ducts,
each opening shall have a minimum free area of 1 in.2/2000 Btu/hr
(1100 min2/kW) of total input rating of all appliances in the enclo-
sure. [See Figure A.9.3.3.1(2).]
Furnace Water
Heater
Chimney or Gas Vent
NOTE: The air duct openings
must have a free area of not
less than one square inch per
2000 BTU of the total input
rating of all equipment in the
enclosure*.
Outlet air duct
Inlet air duct
Figure A.9.3.3.1(2) All Combustion Air From Outdoors
through Horizontal Ducts.
9.3.3.2* One Permanent Opening Method. One permanent open-
ings, commencing within 12 in. (300 mm) of the top of the enclosure,
shall be provided. The appliance shall have clearances of at least 1 in.
(25 mm) from the sides and back and 6 in. (150 mm) from the front of
the appliance. The opening shall directly communicate with the out-
doors or shall communicate through a vertical or horizontal duct to the
outdoors or spaces that freely communicate with the outdoors (see
Figure A.9.3.3.2) and shall have a minimum free area of the following:
(1) 1 in.2/3000 Btu/hr (700 mm2per kW) of the total input rating of all
appliances located in the enclosure, and
(2) Not less than the sum of the areas of all vent connectors in the
space.
Furnace
Water
Heater
Opening
Chimney or Gas Vent
NOTE: The single opening must have
a free area of not less than one
square inch per 3000 BTU of
the total input rating of all equip-
ment in the enclosure, but not less than
the sum of the areas of all vent
connectors in the confined space.
Alternate
Opening
Location
Figure A.9.3.3.2 All Combustion Air
From Outdoors through Single Combustion Air Opening.
9.3.4 Combination Indoor and Outdoor Combustion Air. The use
of a combination of indoor and outdoor combustion air shall be in
accordance with (1) through (3) (see example calculation in Annex J]:
(1) Indoor Openings: Where used, openings connecting the interior
spaces shall comply with 9.3.2.3.
(2) Outdoor Opening(s) Location. Outdoor opening(s) shall be lo-
cated in accordance with 9.3.3.
(3) Outdoor Opening(s) Size. The outdoor opening(s) size shall be
calculated in accordance with the following:
(a) The ratio of the interior spaces shall be the available volume
of all communicating spaces divided by the required volume.
(b) The outdoor size reduction factor shall be 1 minus the ratio
of interior spaces.

16
SYSTEM OPERATION
(c) Theminimum size ofoutdoor opening(s) shallbethe full size
of outdoor opening(s) calculated in accordance with 9.3.3,
multiplied by the reduction factor. The minimum dimension
of air openings shall not be less than 3 in. (80 mm).
9.3.5 Engineered Installations. Engineered combustion air installa-
tions shall provide an adequate supply of combustion, ventilation, and
dilution air and shall be approved by the authority having jurisdiction.
9.3.6MechanicalCombustionAirSupply. Where all combustion air
is provided by a mechanical air supply system, the combustion air shall
be supplied form outdoors at the minimum rate of 0.35 ft3/min per
1000 Btu/hr (0.034 m3/min per kW) for all appliances located within
the space.
9.3.6.1Whereexhaust fansareinstalled, additionalairshall be provided
to replace the exhausted air.
9.3.6.2 Each of the appliances served shall be interlocked to the me-
chanical air supply system to prevent main burner operation where the
mechanical air supply system is not in operation.
9.3.6.3Where combustion air is provided by the building’s mechanical
ventilation system, the system shall provide the specified combustion
air rate in addition to the required ventilation air.
9.3.7 Louvers, Grilles, and Screens.
9.3.7.1 Louvers and Grilles. The required size of openings for com-
bustion, ventilation, and dilution air shall be based on the net free area
ofeachopening. Where thefreearea through adesign of louverorgrille
or screen is known, it shall be used in calculating the size opening
required to provide the free area specified. Where the louver and grille
design and free area are not known, it shall be assumed that wood
louverswillhave 25 percentfreearea, and metallouvers and grilleswill
have 75 percent free area. Nonmotorized louvers and grilles shall be
fixed in the open position.
9.3.7.2 Minimum Scree Mesh Size. Screens shall not be smaller than
1/4 in. mesh.
9.3.7.3 Motorized Louvers. Motorized louvers shall be interlocked
with the appliance so they are proven in the full open position prior to
main burner ignition and during main burner operation. Means shall be
provided to prevent the main burner form igniting should the louver fail
to open during burner startup and to shut down the main burner if the
louvers close during burner operation.
9.3.8 CombustionAir Ducts. Combustion air ducts shall comply with
9.3.8.1 through 9.3.8.8.
9.3.8.1 Ducts shall be constructed of galvanized steel or a material
having equivalent corrosion resistance, strength, and rigidity.
Exception: Within dwellings units, unobstructed stud and joist spaces
shall not be prohibited from conveying combustion air, provided that
not more than one fireblock is removed.
9.3.8.2 Ducts shall terminate in an unobstructed space, allowing free
movement of combustion air to the appliances.
9.3.8.3 Ducts shall serve a single space.
9.3.8.4 Ducts shall not serve both upper and lower combustion air
openings where both such openings are used. The separation between
ductsservicingupper andlowercombustion airopeningsshall bemain-
tained to the source of combustion air.
9.3.8.5Ducts shall not be screened where terminating in an attic space.
9.3.8.6 Horizontal upper combustion air ducts shall not slope down-
ward toward the source of combustion air.
9.3.8.7 The remaining space surrounding a chimney liner, gas vent,
special gas vent, or plastic piping installed within a masonry, metal, or
factory built chimney shall not be used to supply combustion air.
Exception: Direct vent appliances designed for installation in a solid
fuel-burning fireplace where installed in accordance with the
manufacture’s installation instructions.
9.3.8.8 Combustion air intake openings located on the exterior of the
building shall have the lowest side of the combustion air intake open-
ingslocatedat least 12in. (300 mm)verticallyfrom theadjoininggrade
level.
Installation Positions
*MEC96 models may be installed up flow or horizontally
with left or right side down. *CEC96 models may be in-
stalleddown floworhorizontallywith leftorright side down.
Do not install any furnace on its back.
Horizontal Applications and Considerations
Horizontalapplications, in particular, may dictate manyof
the installation’s specifics such as airflow direction, duct-
workconnections, flue and/or combustionairpipeconnec-
tions, etc. The basic application of this furnace as a hori-
zontalfurnacediffers only slightly from an upright installa-
tion.
Horizontal Installations
1. Horizontal installations require 5.5" under the furnace
toaccommodate the drain trap.
2. Horizontalfurnacesmustbe installedwith¾”slopefrom
back to front to permit condensate flow towards the
frontofthe furnace.
When installing horizontally with the left side down, there
aretwo options for connectingtheventpipe to the furnace.
1. Ventingmaybeconnected to the furnace vent pipe fit-
tingonthe original top (now the end)of the furnace
2. Theinternalvent pipeandelbow mayberemovedfrom
the furnace to permit the vent to exit the top (original
side)of thefurnace.Ifthis optionisused, an RF000142
Vent-Draincoupling must be used to keepcondensate
from collecting in the inducer assembly
Refertothe following instructions and illustration.

17
SYSTEM OPERATION
Leveling
Levelingensurespropercondensatedrainagefromthe heat
exchanger and induced draft blower. For proper flue pipe
drainage,thefurnacemust be level lengthwise from end to
end. The furnace should also be level from back to front or
have a slight tilt with the access doors downhill (approxi-
mately 3/4") from the back panel. The slight tilt allows the
heat exchanger condensate, generated in the recuperator
coil,toflowforwardto the recuperator coil front cover.
A
IR
DISCHARGE
Bottom
Return
Duct
Connection
Side
Return
Duct
Connection
Side
Return
Duct
Connection
UPFLOW
UPRIGHT
Counterflow
Bottom
Return
Duct
Connection
UPFLOW HORIZONTAL
LEFT AIR DISCHARGE
Bottom
Return
Duct
A
IR
DISCHARGE
UPFLOW HORIZONTAL
RIGHT AIR DISCHARGE
90% Furnace Recommended Installation Positions
Alternate Electrical and Gas Line Connections
Thefurnaces haveprovisionsallowingfor electricalandgas
lineconnectionsthrough either side panel. In horizontal ap-
plications the connections can be made either through the
“top”or“bottom”ofthefurnace.
Drain Pan
Adrainpanmustbeprovidedifthefurnaceisinstalledabove
aconditionedarea.The drainpanmustcoverthe entirearea
underthefurnace(andairconditioningcoilifapplicable).
Insert flange. Cut 2 ½” long.
R 000142F
Figure 9
CUTHERE
Figure 10
1. Removescrews from theventflange.
2. Removethe internal elbowandventpipe
3. Cut 2 1/2" from the flange .
4. Remove cabinet plug adjacent to inducer outlet and
installanoriginalcabinet vent hole.
5. InstallRF000142couplingoninduceroutlet.
6. Install flanged vent section removed in step 2 and se-
cure with clamps.
7. Secureflangetocabinetusingscrewsremovedinstep1.
Drain Trap and Lines
In horizontal applications the condensate drain trap is se-
cured to the furnace side panel, suspending it below the
furnace. A minimum clearance of 5.5" below the furnace
mustbe provided for thedraintrap.Additionally,the appro-
priatedownward piping slope must bemaintainedfromthe
draintraptothe drain location. Refer to Condensate Drain
Trap and Lines section in this manual or the installation
instructionsfor furtherdetails.If the draintrapand drainline
will be exposed to temperatures near or below freezing,
adequatemeasuresmustbetakentoprevent condensate
fromfreezing.NOTE: Theuseofinsulationand/orheattape
isrecommended.Failuretoprovidepropercondensatedrain-
agecanresult in property damage.

18
SYSTEM OPERATION
Freeze Protection
If the drain trap and drain line will be exposed to tempera-
tures near or below freezing, adequate measures must be
takento prevent condensate from freezing.NOTE: Theuse
of insulation and/or heat tape is recommended. Failure to
provide proper condensate drainage can result in property
damage.
Propane Gas and/or High Altitude Installations
WARNING
POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF
THE CORRECT CONVERSION KITS ARE NOT INSTALLED. THE APPROPRIATE KITS
MUST BE APPLIED TO INSURE SAFE AND PROPER FURNACE OPERATION. ALL
CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE
AGENCY.
Thisfurnace is shipped fromthefactoryconfiguredfor natu-
ral gas at standard altitude. Propane gas installations re-
quire an orifice change to compensate for the energy con-
tentdifference between natural and propanegas.
Highaltitudeinstallationsmayrequireboth apressure switch
andanorificechange.Thesechangesarenecessarytocom-
pensate for the natural reduction in the density of both the
gas fuel and the combustion air at higher altitude.
Refer to the Accessories Charts in this manual or product
Specification Sheet for a tabular listing of appropriate
manufacturer’skits for propane gasand/orhigh altitude in-
stallations. The indicated kits must be used to insure safe
andproperfurnaceoperation.Allconversionsmustbeper-
formedbyaqualifiedinstaller, or service agency.
VENT/FLUE PIPE AND COMBUSTION AIR PIPE
ONLY)
WARNING
FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN BODILY INJURY OR
DEATH. CAREFULLY READ AND FOLLOW ALL INSTRUCTIONS GIVEN IN THIS
SECTION.
WARNING
UPON COMPLETION OF THE FURNACE INSTALLATION, CAREFULLY INSPECT THE
ENTIRE FLUE SYSTEM BOTH INSIDE AND OUTSIDE THE FURNACE TO ASSURE IT
IS PROPERLY SEALED. LEAKS IN THE FLUE SYSTEM CAN RESULT IN SERIOUS
PERSONAL INJURY OR DEATH DUE TO EXPOSURE TO FLUE PRODUCTS,
INCLUDING CARBON MONOXIDE.
Acondensinggasfurnaceachieves itshighlevelofefficiency
by extracting almost all of the heat from the products of
combustionandcoolingthem to the point where condensa-
tiontakesplace.Becauseoftherelativelylowfluegastem-
peratureand watercondensationrequirements, PVCpipeis
usedasventingmaterial.
This furnace must not be connected to Type B, BW, or L
vent or vent connector, and must not be vented into any
portionofafactorybuiltormasonrychimneyexceptwhen
used as a pathway for PVC as described later in this sec-
tion. Never common vent this appliance with another ap-
pliance or use a vent which is used by a solid fuel appli-
ance.
Itisthe responsibility of the installer to followthemanufac-
turers’recommendations andtoverifythat allvent/fluepip-
ingandconnectorsarecompatiblewithfurnace flue prod-
ucts. Additionally, it is the responsibility of the installer to
ensure that all piping and connections possess adequate
structuralintegrity and supporttopreventflue pipe separa-
tion,shifting,orsaggingduringfurnaceoperation.
Materials and Joining Methods
WARNING
TO 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. AVOID BREATHING
CEMENT VAPORS OR CONTACT WITH SKIN AND/OR EYES.
Precautionsshould be taken toprevent condensatefrom
freezing inside the vent/flue pipe and/or at the vent/flue
pipe termination. It is our recommendation that all vent/
flue piping exposed to temperatures below 35°F for
extended periods of time should be insulated with 1/2”
thick closed cell foam. Also all vent/flue piping exposed
outdoorsinexcessoftheterminationsshown inthismanual
(or in unheated areas) should be insulated with 1/2” thick
closedcellfoam.Inspectpiping for leaks prior to installing
insulation.
Thefollowing bullets and diagramdescribetherestrictions
concerning the appropriate location of vent/flue pipe and
combustionair intake pipe(whenapplicable)terminations.
Refer to or the installation instructions for specific details
onterminationconstruction.
• All terminations must be located at least 12 inches
aboveground level or theanticipatedsnowlevel.
• Vent terminations must terminate at least 3 feet
aboveanyforcedair inlet located within 10 feet.
NOTE:This provisiondoesnot applytothe combus-
tion air intake termination of a direct vent applica-
tion.
• Thevent termination of anon-directventapplication
mustterminateat least 4 feet below, 4 feet horizon-
tallyfrom, or1footabove anydoor,window,or grav-
ity air inlet into any building.
• Theventterminationofadirectventapplicationmust
terminateatleast12inchesfromanyopeningthrough
which flue gases may enter a building (door, win-
dow,orgravityairinlet).
• Theventterminationofventpiperunverticallythrough
a roof must terminate at least 12 inches above the
roof line (or the anticipated snow level) and be at
least12inchesfromanyvertical wall (including any
anticipatedsnowbuildup).

19
SYSTEM OPERATION bustionairintaketopreventinadvertentblockage.Thetee
orelbowsusedinthevent/flue terminationmustbeincluded
when determining the number of elbows in the piping sys-
tem.
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3 126 120 115 110 105 99 94 89
2 3733302622181511
3 107 102 96 91 86 81 75 70
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
*CEC960603BN
*CEC960803BN
*CEC961005CN
*MEC960603BN^
*MEC960803BN
*MEC960804CN
*MEC961004CN
*MEC961005CN
*CEC960403BN
*MVC96/*CVC96 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)
*MEC960302BN
&
*MEC960402BN
*MEC960303AN
&
*MEC960403AN
*MEC960603AN^
1) Maximumallowablelimits listedonindividuallengths forinletandflue andNOTacombination.
2) Minimumrequirement for eachvent pipe isfive (5) feetin length andone elbow/tee.
3) Tee used inthevent/flueterminationmustbeincludedwhendeterminingthenumberofelbowsin
thepipingsystem.
4) 21/2” or3”diameter pipecan beusedin placeof 2”diameterpipe.
5) IncreasedClearance Configurations using(2) 45deg.Long Sweepelbowsshould beconsid-
eredequivalenttoone 90 deg.elbow.
6) One90°elbow shouldbesecuredtothe combustionairintakeconnection.
12" MINIMUM
VENT/FLUE TEE
OR
90° ELBOW TURNED
DOWN
12" MINIMUM ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
90% Furnace Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
NOTE:Terminate bothpipes in thesame pressurezone
(same side of roof, no major obstacles between pipes,
etc.).
• Aventterminationshallnotterminateoverpublicwalk-
ways or over an area where condensate or vapor
couldcreateanuisance or hazard or could be detri-
mentalto theoperationof regulators,reliefvalves,or
otherequipment.
• Thecombustionairintake terminationof adirectvent
applicationshouldnot terminate in an area whichis
frequently dusty or dirty.
NOTE: In Canada, the B149 Fuel Gas Code takes prece-
denceovertheprecedingtermination restrictions.
12"
12"
NON-DIRECT VENT
VENT/FLUE TERMINATION
NO TERMINATIONS
ABOVE WALKWAY
12"
4'
4'
NON-DIRECT VENT
VENT/FLUE TERMINATION
DIRECT VENT
VENT/FLUE TERMINATION
12"
10'
3"
FORCED AIR
INLET
OTHER THAN
COMBUSTION AIR
TERMINATION INTAKE
GRADE OR HIGHEST
ANTICIPATED
SNOW LEVEL
90% Furnace Vent Termination Clearances
WARNING
THE RUBBER ELBOW IS NOT DESIGNED TO SUPPORAT A LOAD. WHEN 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.
Vent/Flue Pipe Lengths (Non-Direct Vent) and Diam-
eters
Refertothefollowingtables for applicable length, elbows,
andpipe diameterforconstruction ofthevent/flue pipesys-
temofa non-direct vent installation. In addition tothevent/
flue pipe, a single 90° elbow must be secured to the com-

20
SYSTEM OPERATION
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
STRAIGHT
ELBOWS
VENT/FLUE TEE (
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
OPTIONAL)
12" MIN. ABOVE
HIGHESTANTICIPATED
SNOW LEVEL
12" MIN.
HorizontalTermination(SinglePipe)
AboveHighestAnticipatedSnowLevel
90º OR 45°
ELBOW
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
6” MAX
10”- 24”
4” MIN
StandardHorizontalTerminations (DualPipe)
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3” - 24”
AlternateHorizontalVentTermination(DualPipe)
90°
ELBOWS
12" MIN.ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3”-24” BETWEEN PIPES
Combustion Air Intake may also be snorkeled to obtain 12” min groun
d
c
learance.
AlternateVentTerminationAboveAnticipated Snow Level
(DualPipe)