Goodman GMEC96, AMEC96 User Manual

Service Instructions

®

Goodman® Brand GMEC96

& Amana

Two Stage Furnace

with multi-speed ECM Motor

®

Brand AMEC96

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.

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.

Copyright© 2014 Goodman Company, L.P.

RS6612013

August 2014

TABLE OF CONTENTS

IMPORTANT INFORMATION ......................... 2 - 6

PRODUCT IDENTIFICATION ........................ 7 - 8

INSTALLATION CONSIDERATIONS ........... 9 - 26

SYSTEM OPERATION ...............................27 - 33

ACCESSORIES..........................................34 - 37

SERVICING TABLE OF COnTENTS.................38

SERVICING .. .............................................. 39 - 56

MAINTENANCE ............................................57- 58

IMPORTANT INFORMATION

Pride and workmanship go into every product to provide our customers with quality products. It is possible, however,
that during its lifetime a product may require service. Products should be serviced only by a qualified service technician
who is familiar with the safety procedures required in the repair and who is equipped with the proper tools, parts, testing
instruments and the appropriate service manual. REVIEW ALL SERVICE INFORMATION IN THE APPROPRIATE

SERVICE MANUAL BEFORE BEGINNING REPAIRS.

IMPORTANT NOTICES FOR CONSUMERS AND SERVICERS

RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS

TO

PREVENT THE RISK OF PROPERTY DAMAGE, PERSONAL INJURY
OR DEATH, DO NOT STORE COMBUSTIBLE MATERIALS OR USE
GASOLINE OR OTHER FLAMMABLE LIQUIDS OR VAPORS IN THE
VICINITY OF THIS APPLIANC E

G

OODMAN WILL NOT BE RESPONSIBLE FOR ANY INJURY OR
PROPERTY DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE
PROCEDURES
YOU ASSUME RESPONSIBILITY FOR ANY PERSONAL INJURY OR
PROPERTY DAMAGE WHICH MAY RESULT
REQUIRE A LICENSE TO INSTALL OR SERVICE HEATING AND AIR
CONDITIONING EQUIPMENT

. IF

YOU INSTALL OR PERFORM SERVICE ON THIS UNIT

.

. M

ANY JURISDICTIONS

.

WARNING

HIGH VOLTAGE
D

ISCONNEC T ALL POWER BEFORE SERVICING OR

INSTALLI NG THIS UNIT .

BE PRESEN T.

DAMAGE, PER SONAL INJURY OR DEATH.

MULTIPLE POWER SOURCES MAY

FAILURE TO DO SO MAY CAUSE PROPERTY

,

,

2

IMPORTANT INFORMATION

A

DANGER

CARBON MONOX IDE POISONING HAZARD

Special warning for installation of furnaces or air handling units in enclosed area such as garages, utility rooms or parking areas. Carbon monoxide prod ucing
devices (such as automobile, space heater , gas water heate r , etc.) Should not be operated in enclosed area s such as unventilate d garages or utility rooms because
of the danger of carbon monoxide (CO) poisoning resulting from the exhaust emissions. If a furnace or air handler is installed in an enclosed area and a carbon
monoxide producing de vice is operated therein, there must be adequate direct outside ventilation. Carbon monoxide emissions can be ( re)cir culated through out
the structure if the furnace or air handler is operating in any mode. CO can cause serious illness including permanent brain damage or death.

RISQUE D'EMPOISONNEMENT AU MONOXYDE DE CARBONE

vertissement special au sujet de l'installation d'appareils de chauffage ou de traitement d'air dans des endroits clos, tets les gara g es , les locaux d'entr etien et les
stationnements. Evitez de mettre en marche les appareils prod uisant du monoxyde de carbone (tels que les automobile, les appareils de chauffage autonome,etc.)
dans des endroits non ventilés tels que les d'empoisonnement au monoxyde de carbone. Si vous devez faire fonctionner ces appareils dans un endroit clos,
assures-vous qu'il y ait une ventilation directe provenant de l'exterie . Les émissions de monoxyde de carbone peuvent etre recircules dan s les endroits clos,
si l'appareil de chauffage ou de traitement d'air sont en marche. Le monoxyde de carbone peut causer des maladies graves telles que des dommages permanents
au cerveau et meme la mort.

RIESGO DE INTOXICACIÓN POR MONÓXIDO DE CARBONO

Advertencia especial para la instalación de calentadores ó maneja oras de aire en áreas cerradas como estaciona mientos ó cuart os de servicio. Los equipos ó
aparatos que producen monóxido de carbono (tal como automóvil, calentador de gas, calentador de agua por medio de gas, etc) no deben ser operados en
áreas cerradas debido al riesgo de enve nenamiento por monóx i d o de ca rb on o (C O ) qu e resu lta de las emisiones de ga se s de co mb us t i ón. Si el equipo ó
aparato se opera en dichas áreas, debe existir una adecuada ventilac ón directa al exterior. Las emisiones de monóxido de carbono pueden circular a través
del aparato cuando se opera en cualquier modo. El monóxido de carbono puede causar enfermedades severas como daño cerebral permanent e ó muer te .

DANGER

PELIGRO

0140M00020-D

To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased this
product. For further assistance, please contact:

CONSUMER INFORMATION LINE

GOODMAN® BRAND PRODUCTS

TOLL FREE

1-877-254-4729 (U.S. only)

email us at:

[e-mail]

fax us at: [phone]

(Not a technical assistance line for dealers.)

CONSUMER INFORMATION LINE

AMANA® BRAND PRODUCTS

TOLL FREE

1-877-254-4729 (U.S. only)

email us at:

[e-mail]

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.

3

IMPORTANT INFORMATION

FOR Y OUR S AFETY READ BEFORE OPERATING

If you do not follow these instructions exactly,
a fire or explosion may result causing property
damage, personal injury or loss of life.

A. This appliance does not have a pilot. It
is equipped with an ignition device which
automatically lights the burners. Do not
try to light the burners by hand.

B. BEFORE OPERATING smell around
the appliance area for gas. Be sure to
smell next to the floor because some gas
is heavier than air and will settle on the
floor.

WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.
Do not touch any electric switch;
do not use any telephone in your
building.
Immediately call your supplier
from a neighbor's phone. Follow
the gas suppliers instructions.

If you cannot reach your gas supplier,

call the fire department.

C. Use only your hand to move the gas
control switch or knob. Never use
tools. If the gas control switch or knob
will not operate, don't try to repair it,
call a qualified service technician.
Force or attempted repair may result in
a fire or explosion.

D. Do not use this appliance if any part
has been under water. Immediately call
a qualified service technician to inspect
the appliance and to replace any part of
the control system and any gas control
which has been under water.

OPERATING INSTRUCTIONS

1. STOP! Read the safety information

2. Set the thermostat to lowest setting.

3. Turn off all electric power to the
appliance.

4. This appliance is equipped with an
automatic ignition system which
automatically lights the burners. Do not
try to light the burners by hand.

5. Remove control access panel.

6. Move the gas control switch or knob
to "OFF ".

GAS CONTROL
SWITCH SHOWN
IN "ON" POSITION

7. Wait five (5) minutes to clear out any
gas. If you then smell gas, STOP!above on this label.
Follow "B" in the safety information
above on this label. If you don't smell
gas, go to the next step.

8. Move the gas control switch or knob
to "ON".

9. Replace control access panel.

10. Turn on all electric power to the
appliance.

11. Set the thermostat to the desired
setting.

12. If the appliance will not operate,
follow the instructions "To Turn Off Gas
To Appliance" and call your service
technician or gas supplier.

TO TURN OFF GAS TO APPLIANCE

1. Set the thermostat to its lowest setting.

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

3. Remove control access panel.

4. Move the gas control switch or knob
to "OFF". Do not force.

5. Replace control access panel.

WARNING: Improper
alteration, service or

maintenance can
cause injury or
property damage.

Refer to the user's
information manual
provided with this

consult a qualified
or the gas supplier.

This furnace must be

instructions and local
codes. In the absence
of local codes, follow
the National Fuel Gas

Code, ANSI Z223.1.

For indoor installation.

PGB & PGJ
For outdoor
installation only .

If notWARNING:

installed, operated
and maintained in
accordance with the
manufacturer's
instru ctions, this
product could expose
you to substances
in fuel combust ion
which can cause
death or serious
illness and which
are known to the
State of California to
cause cancer, birth
defects or other
reproductive harm.
This product contains
fiberglass insulation.
Fiberglass insu la tion
contains a chemic al

California to cause
cancer.

FOR YOUR SAFETY

Do not store or use gasoline or
other flammable vapors and liquids in the vicinity of this
or any other app liance.

4

0140F00001P

IMPORTANT INFORMATION

CONSIGNES DE SECURITE - LIRE

AVANT D'ALLUMER L'APPAREIL

AVERTISSEMENT: Le non-respect des in structions qui suivent peut

^

entrainer un r i sque d'incendie ou d'explosion causant des dommages,
des blessures ou la mort.

A. Cet appareil comporte pas de veilleuse. Il est muni d'un mecanis m e qui allume
automatiquement le bruleur. N

B. Sentir tout autour de l'appariel AVANT D'ALLUMER afin de deceler toute fuite de gaz.
Assurez-vous de sentir tout pres du plancher car certains gaz sont plus lourds que l'air
et se deposeront sur le plancher.

SI VOUS SENTEZ UNE ODEUR DE GAZ:
Ne tentez d'allumer aucun appariel.

Ne touchez pas aux interrupteurs electriques; n'utiliser aucun telephone
dans l'edifice ou vous vous trouvez.
Appelez immediatement votre fournisseur de gaz en utilisant le telephone
d'un voisin et suivez les instructions du fournisseur.
Appelez les pompiers si vous ne parvenez pas a rejoindre votre fournisseur
de gaz.

C. N'utiliser que votre main pour pousser ou tourner le commande du gaz. N'utilisez
jamais d'outils. Si vous ne parvenez pas a pousser ou a t ourner la commande, ne tentez
pas de la reparer; appelez un reparateur qualifie. Forcer la commande ou essayer de la
reparer peut entrainer un risque d'incendie ou d'explosion.

D. N'utilisez pas cet appareil si l'une de ses parties a ete dans l'eau. Si cela se produit,
demandez immediatement a un reparateur qualifie d'insp ecter l'appareil et de remplacer
toute piece du systeme de controle et toute commande de gaz ayant ete dans l'eau.

^^

'allumez paz le bruleur manuellement.

^

^

0140F00002P

1. UN INSTANT! Lisez d'abord les consignes

INSTRUCTIONS DE SERVICE

d e securi te ci-dessus.

2. Reglez le thermostat a son point le plus bas.

3. Coupez l'alimentation electrique de l'appareil.

4. Cet appareil est muni d'un mecanisme qui
allume automatiquement le bruleur. Ne tentez
pa s d'allum er le bruleur manuellement.

5. Retirez le panneau d'acces de la commande.

6. Mettez la commande de gaz a la position

^

ARRET ("OFF").

7. Attendez cinq (5) minutes afin de permettre a
t ou t gaz present d'etre evacue. Si vous sentez
une odeur de gaz a ce moment, ARRETEZ! et
suivez les consignes de securite donnees au
paragraphe B ci-dessus. Si vous ne sentez pas
de gaz, passez a l'etape suivante.

8. Mettez la commande de gaz a la position
MARCHE ("ON").

9. Remettez la panneau d'acces de la commande
en plac e.

10. Retablissez l'alimenation electrique de l'appareil.

11. Reglez le thermostat a le temperature desiree.

12. Si l'appareil ne fonctionne pas, suivez les
instructions intitulees "Arret du gaz" et appelez un
reparateur qualifie ou votre fournisseur de gaz.

1. Reglez le thermostat a son point le plus bas.

2. Coupez l'alimentation electrique de l'appareil si vous devez effectuer un entretien.

3. Retirez le panneau d'acces de la commande.

4. Mettez la commande de gaz a la position ARRET ("OFF").

5. Remettez le panneau d'acces de la commande en p lace.

^

^

^

^

^

^

ARRET DU GAZ

Commande de
gaz en position

"MARCHE"

^

5

IMPORTANT INFORMATION

A

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6

PRODUCT IDENTIFICATION

The model and manufacturing number are used for positive identification of component parts used in manufacturing.
Please use these numbers when requesting service or parts information.

* M E C 96 060 3 B N A A

1 2 3 4 5,6 7,8,9 10 11 12 13 14

Brand

A - Amanafi Brand

A - Amana® Brand

G - Goodmanfi Brand

G - Goodman® Brand

Motor

NOx

AFUE

MBTU/h

MODEL # MFG. # DESCRIPTION

AM E C060302BNAA

AMEC96

GM EC9 6

AM E C960402BNAA
AM E C060603BNAA
AM E C960803BNAA
AM E C961004CNA A
AMEC961205DNAA

GMEC06 0302BNAA
GMEC96 0402BNAA
GMEC06 0603BNAA
GMEC96 0803BNAA
GMEC96 1004CNA A
GMEC961205DNAA

Amana® Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Up
flow/Horiz ontal 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
ent

Goodman ® Br and 96 % Two Sta ge Heat ing / Two Stage Cooling Gas Fu rnace, Up
flow/Horiz ontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECM motor.
Al uminized S t eel t ubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas

7

PRODUCT IDENTIFICATION

MODEL # MFG # DESCRIPTION

AFE18-60A

AMU1 620
AMU1 625
AMU2 020
AMU2 025

GMU1620
GMU1625
GMU2020
GMU2025

ASAS-10
ASAS-11
ASAS-12
ASAS-18

DCVK-20

DCVK-30

N/A

P 1251305F
P 1251306F
P 1251307F
P 1251308F

N/A

P 1251301F
P 1251302F
P 1251303F
P 1251304F

P 1254001F

P 1254002F

Fossil Fuel Kit.

above/do wnstream of a gas or fo ssil fuel f urnace when used wit h a h eat pump. I t will
operate with single and two stage heat pumps and single and two stage f ur na c es. The
AFE 18- 60 A control will turn the he at pump unit of f when the f ur nace is turned on. An ant i­short c ycle feature initiate s a 3 minute timed off d elay when the compressor goes of f.

Media Air Cleaner

efficienc y air fil trat ion device designed to r emove dirt, dust, pollen and other microscopic
particles from th e a ir passing thro ugh it. Flexible performance range up to 2,0 00 CFM
capac ity. The air cl eaner should be installed in t he syst em so that a ll the sy stem air is
circ u lated t hr ough the air cleaner. The air cleaner will onl y remove the airborne
cont a minants delivered to it. Max imum perf or mance is obt ained when the syst em blower
is set for c o ntinuous operat ion. Carbon filt er s (optional) ar e available.

Electronic Air Cleane r

air co ntaminants down to .01 microns. Car bo n filters (optional) r emove odors. Dual
indicator lights show unit operation at a glan c e. Elec tronic pr oving switch cycles the air
cleaner On/Off wit h the sy stem fa n. Durable powde r - c o at paint finish resists corrosion.

Concentric Vent Kit

is design ed to allow t er minat ion s of a dir e c t vent furnace to be " c oncentr ically" vented
thr o ugh a wall or roof . Thi s kit allows a single penetration to support terminations for bo th
the vent/ f l ue and t he combustion air intake pipe. The DCVK-20 ( 2") and DCVK-30 (3" ) k its
are ce r tified for models listed above. See specif ic a tion sheets on future models for use of
the vent kit.

The AFE18-60A cont r ol is designed for use where the indoor coil is located

. The Amana (AMU*) and Goodman (GMU*) Media Air Cleaner is a high

. The High-E ffi c iency Electronic Air Cleaner is designed to r emove

. For use with Aman a® B r an d high efficiency furnace models. This kit

0170K00000S

0170K00001S

EFR0 2

LPLP03

RF000142

N/A

N/A

P1221001

P 1221002F

N/A

N/A

Side W all Only Concentr ic Vent Kit

is to be used with 2" - 3" v e nt syste ms. The vent k it must ter minate outside the str uc ture.
This kit is NOT intended for use with single pipe (indir ec t vent) insta llat ion s.

Side W all Only Concentr ic Vent Kit

This kit is to be used with 2" only vent systems. The vent kit must terminate outside the
structure. T his kit is NOT intended f or use wit h single pipe ( ind ir ect vent) insta llations.

External Filter Rack Kit

casing, for installation of a per manent filter . The r ack is moun ted over the indoor air
blower c ompartment area of eithe r side panel, and provide filt e r r etention as well as a
location for att aching ret urn air duct work.

LP Gas Low Pressure Kit

80% and 90% single-stage a nd two-stage gas f ired fur nac e pr o duc ts installed on LP ga s
listed in t hi s manual. T hi s kit includes harness adaptors to w or k with White-Rodgers
single & two stage gas valves,Honeywell single and two-stage g as valves, as well as
modulat ing gas valves.

Ve nt Dr ain Coupling

the in ternal elbow is removed.

. This kit is intended to provide a location, ex ternal to the furnace

. Designed for app lic at ion on Goodman® and A mana® Br and's

. For use when t he furnac es is installed in horizontal left posit ion an d

. For use with high effic i enc y furnace models. This kit

. For use with high effic i enc y 90% fur nac e models.

8

INSTALLATION CONSIDERATIONS

Introduction

This is a Category lV furnace. This furnace uses a pressur­ized venting system and must be installed per National and
local codes requirements and the installation manual that
was shipped with the furnace.

The *MEC96 34.5" furnace is one of the products in our
newly redesigned line of shorter chassis furnaces. It is avail­able in the following sizes and suitable for up flow / horizon­tal installation.

*MEC960302BNAA
*MEC960402BNAA
*MEC960603BNAA
*MEC960803BNAA
*MEC961004CNAA
*MEC961205DNAA

Safety

Please adhere to the following warnings and cautions when
installing, adjusting, altering, servicing, or operating the fur­nace.

WARNING

T

O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER INSTALLATION,

ADJUSTMENT, ALTERATI ON, SERVICE OR MAINTENANCE, RE FER TO THIS

MANUAL.

QUALIFIED INSTALLER, SERVICE AGENCY OR THE GAS SUPPLIER.

OR ADDITIONAL ASSISTANCE OR INFORMATION, CONSULT A

F

WARNING

HIS PRODUCT CONTAINS OR PRODUCES A CHEMICAL OR CHEMICALS WHICH

T

MAY CAUSE SERIOUS ILLNESS OR DEATH AND WHICH ARE KNOWN TO THE

S

TATE OF CALIFORNIA TO CAUSE CANCER, BI RTH 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 COMPO NENTS FROM WATER.

Charge (ESD) Precautions

NOTE: Discharge body’s static electricity before touching

unit. An electrostatic discharge can adversely affect electri­cal components.

Use the following precautions during furnace installation and
servicing to protect the integrated control module from dam­age. By putting the furnace, the control, and the person at
the same electrostatic potential, these steps will help avoid
exposing the integrated control module to electrostatic dis­charge. 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
charge to ground.

2. Firmly touch a clean, unpainted, metal surface of the
furnace near the control. Any tools held in a person’s
hand during grounding will be discharged.

3. Service integrated control module or connecting wiring
following the discharge process in Step 2. Use caution
not to recharge your body with static electricity; (i.e., do
not move or shuffle your feet, do not touch ungrounded
objects, etc.). If you come in contact with an ungrounded
object, repeat Step 2 before touching control or wires.

4. Discharge any static electricity from your body to ground
before removing a new control from its container. Follow
Steps 1 through 3 if installing the control on a furnace.
Return any old or new controls to their containers before
touching any ungrounded object.

Product Application

This product is designed for use as a residential home gas
furnace. It is not designed or certified for use in mobile home,
trailer, or recreational vehicle 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 *MEC96 furnaces are ETL certified appliances and are
appropriate for use with natural or propane gas. (NOTE: If
using propane gas, a propane conversion kit is required).

*MEC96 furnaces are dual certified.
Dual certification means that the combustion air inlet pipe is

optional and the furnace can be vented as a:

Non-direct vent (single pipe) central forced air furnace
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 which
all combustion air supplied directly to the furnace burn­ers through a special air intake system outlined in
this manual and the installation instructions.

To ensure proper installation, operation and servicing, thor­oughly read the installation and service manuals for specif­ics pertaining to the installation, servicing and application of
this product.

WARNING

OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE,

P

EXPLOSION, SMOKE, SOOT, CONDENSTAION, ELECTRICAL SHOCK OR CARBON

MONOXIDE MAY RESULT FROM IMPROPER INSTALLAT ION, REPAIR, OPERATION,

OR MAINTENANCE OF THIS PRODUCT.

9

INSTALLATION CONSIDERATIONS

WARNING

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.

To ensure proper furnace operation, install, operate, main­tain and service the furnace in accordance with the installa­tion, 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
plumbing or waste water codes, and other applicable codes.

A copy of the National Fuel Gas Code (NFPA 54/ANSI
Z223.1) can be obtained from any of the following:

American National Standards Institute
1430 Broadway
New York, NY 10018
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02269

CSA International
8501 East Pleasant Valley
Cleveland, OH 44131

A copy of the CAN/CGA B149 Installation Codes can be
obtained from:

CSA International
178 Rexdale Boulevard
Etobicoke, Ontario, Canada M9W, 1R3

The rated heating capacity of the furnace should be greater
than or equal to the total heat loss of the area to be heated.
The total heat loss should be calculated by an approved
method or in accordance with “ASHRAE Guide” or “Manual
J-Load Calculations” published by the Air Conditioning Con­tractors of America.

Location Requirements and Considerations

WARNING

O PREVENT POSSIBLE EQUIPMENT DAMAGE, P ROPERTY DAMAGE, PERSONAL

T

INJURY OR DEATH, THE FO LLOWING BULLET POINTS MUST BE OBSERVED

WHEN INSTALLING THE UNIT.

Follow the instructions listed below when selecting a fur­nace 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 pro­posed or existing air distribution system.

• Ensure the temperature of the return air entering the
furnace is between 55°F and 100°F when the furnace
is heating.

• If the furnace is installed in an application where the

• Provide provisions for venting combustion products

NOTE: The length of flue and/or combustion air piping can

• Locate the 90% furnace so that the condensate can

• Set the 90% furnace on a level floor to enable proper

• Ensure upflow or horizontal furnaces are not installed

• Exposure to contaminated combustion air will result

typical operating sound level of a furnace is deemed
objectionable, an optional sound reduction kit is avail­able. Consult your local distributor for more details.

outdoors through a proper venting system. Special
consideration should be given to vent/flue pipe routing
and combustion air intake pipe when applicable.

90% Furnaces: Refer to the Vent/Flue Pipe and Com-
bustion Air Pipe -Termination Locations section in this

manual or the installation instructions for appropriate
termination locations. Also for 90% furnaces, refer to
the Vent/Flue Pipe and Combustion Air Pipe -Termi-
nation Locations section in this manual or the instal­lation instructions to determine if the piping system
from furnace to termination can be accomplished
within the guidelines given.

be a limiting factor in the location of the furnace.

be piped at a downward slope away from the furnace
to the drain. Do not locate the furnace or its conden­sate drainage system in any area subject to below
freezing temperatures without proper freeze protec­tion. Refer to the Condensate Drain Lines and Trap
section in this manual or the installation instructions
for further details.

condensate drainage. If the floor becomes wet or damp
at times, place the furnace above the floor on a con­crete base sized approximately 1-1/2" larger than the
base of the furnace. Refer to the Horizontal Applica-
tions and Considerations section in this manual or
the installation instructions for leveling of horizontal
furnaces.

directly on carpeting, or any other combustible mate­rial. The only combustible material allowed is wood.

in safety and performance-related problems. Do not
install the furnace where the combustion air is ex­posed to the following substances:

chlorinated waxes or cleaners
chlorine-based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
carbon tetrachloride
halogen type refrigerants

10

INSTALLATION CONSIDERATIONS

cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
and masonry acid washing materials

• Isolate a non-direct vent furnace if it is installed near
an area frequently contaminated by any of the above
substances. This protects the non-direct vent furnace
from airborne contaminants. To ensure that the en­closed non-direct vent furnace has an adequate sup-
ply of combustion air, vent from a nearby uncontami­nated room or from outdoors. Refer to the Combus-
tion and Ventilation Air Requirements section in 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
the cooling unit coil. Premature heat exchanger fail­ure will result if the cooling unit coil is placed in the
return air of the furnace.

• 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
damage by vehicles.

• If the furnace is installed horizontally, the furnace ac-

Clearances and Accessibility

Installations must adhere to the clearances to combustible
materials to which this furnace has been design certified.
The minimum clearance information for this furnace is pro­vided on the unit’s clearance label. These clearances must
be permanently maintained. Refer to Specification Sheet for
minimum clearances to combustible materials. Clearances
must also accommodate an installation’s gas, electrical,
and drain trap and drain line connections. If the alternate
combustion air intake 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 in­stallation instructions for details. NOTE: In addition to the
required clearances to combustible materials, a minimum
of 24 inches service clearance must be available in front of
the unit.

A furnace installed in a confined space (i.e., a closet or
utility room) must have two ventilation openings with a total
minimum free area of 0.25 square inches per 1,000 BTU/hr
of furnace input rating. 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 confined space. In a
typical construction, the clearance between the door and
door frame is usually adequate to satisfy this ventilation
requirement.

cess doors must be vertical so that the burners fire
horizontally into the heat exchanger. Do not install
the unit with the access doors on the “up/top” or “down/
bottom” side of the furnace.

MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS

POSITION SIDES REAR FRONT BOTTOM FLUE TOP

Upflow 0" 0" 1" C 0" 1"

Horiz ontal 6" 0" 1" C 0" 4"

• C = if plac ed on combustible floor, the floor MU ST be wood ONLY.

• For servic ing or cleaning, a 24" front cleara nce is recommended.

• Unit connections (electric al, fl ue, and drain) may nec essitate great er c l earances th an the min i mum c learanc es
listed above

• In all case, a c cessibility clearance must take precedence o v er from the enclosure where accessitilit y clearances
are gre ater.

• Approved for line con tact in t he horizontal positi on.

11

INSTALLATION CONSIDERATIONS

Furnace Suspension

If suspending the furnace from rafters or joist, use 3/8"
threaded rod and 2”x2”x1/8” angle iron as shown in the fol­lowing figure. If the furnace is installed in a crawl space it
must also be suspended from the floor joist or 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 de­pend on the application and the clearances necessary.

PROVIDE 8" MINIMUM CLEARANCE BETWEEN

CENTER ROD AND FURNACE CABINET

TO ALLOW FOR CIRCULATOR BLOWER REMOVAL.

3/8" DIAMETER

THREADED ROD

(6 PLACES)

HOLD DOWN

NUTS

SUPPORT

NUTS

GAS PIPING

2"X2"X1/8" ANGLE IRON

(3 PLACES)

ALTERNATE
GAS PIPING

POSITION AS CLOSE AS POSSIBLE

TO BLOWER DECK 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.

CONDENSATE

DRAIN

TILT OUTWARD TO ALLOW FOR

DOOR AND CIRCULATOR BLOWER

REMOVAL.

90% Suspended Furnace Shown

EXISTING FURNACE REMOVAL

NOTE: When an existing furnace is removed from a venting

system serving other appliances, the venting system may
be too large to properly vent the remaining attached appli­ances.

The following vent testing procedure is reproduced from the

American National Standard/National Standard of Canada for
Gas-Fired Central Furnaces ANSI Z21.47, latest edition,
CSA-2.3b, latest edition Section 1.23.1.

The following steps shall be followed with each appliance connected to
the venting system placed in operation, while any other appliances
connected to the venting system are not in operation:

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
CSA B149 Installation Codes and these instructions. 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

all doors between the space in which the appliance(s) connected
to the venting system are located and other spaces of the building.
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

opening after 5 minutes of main burner operation. Use the flame
of a match or candle;

f. After it has been determined that each appliance connected to the

g . If improper venting is observed during any of the above tests, the

Corrections must be in accordance with the latest edition of
the National Fuel Gas Code NFPA 54/ANSI Z223.1 and/or
CSA B149 Installation Codes.

If resizing is required on any portion of the venting system,
use the appropriate table in Appendix G in the latest edition
of the National Fuel Gas Code ANSI Z223.1 and/or CSA B149

Installation Codes.

Thermostat Requirements

A two stage heat/cool thermostat is recommended. A single
stage heating thermostat may be used. It is recommended
that a high quality thermostat with a "C" terminal is used to
operate the furnace.

Thermostat Location

In an area 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
the following:

• Drafts, or dead spots behind doors, in corners, or un-

• Hot or cold air from registers.

• Radiant heat from the sun.

• Light fixtures or other appliances.

• Radiant heat from a fireplace.

• Concealed hot or cold water pipes, or chimneys.

• Unconditioned areas behind the thermostat and de-

COMBUSTION AND VENTILATION AIR
REQUIREMENTS

OSSIBLE PROPERTY DAMAGE, PERSONAL I NJURY OR DEATH MAY OCCUR

P

IF THE FURNACE I S NOT PROVIDED WITH ENOUGH FRESH AIR FOR PROPER

COMBUSTION AND VENTILATION OF FLUE GASES. MOST HOMES REQUIR E

OUTSIDE AIR BE SUPPLIED TO THE FURNACE AREA.

Improved construction and additional insulation in buildings
have reduced heat loss by reducing air infiltration and es­cape around doors and windows. These changes have helped
in reducing heating/cooling costs but have created a prob­lem 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.

When the furnace is installed as a direct ven (2-pipe) fur­nace, no special provisions for air for combustion are re­quired. However, if this furnace is to be installed in the same

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;

common venting system must be corrected.

der cabinets.

humidistat, such as an outside wall.

WARNING

12

INSTALLATION CONSIDERATIONS

space with other gas appliances, such as a water heater,
ensure there is an adequate supply of combustion and ven­tilation air for the other appliances. Refer to the latest edi­tion of the National Fuel Gas Code NFPA 54/ANSI Z223.1
(Section 9.3), or CAN/CGA B149 Installation Codes (Sec­tions 7.2, 7.3, or 7.4), or applicable provisions of the local
building codes for determining the combustion air require­ments for the appliances.

Most homes will require outside air be supplied to the fur­nace area by means of ventilation grilles or ducts connect­ing 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 National Fuel Gas Code NFPA 54/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.

Exception No. 1: This provision shall not apply to direct vent appliances.

9.3.1.2 Appliances of other than natural draft design and other than
Category 1 vented appliances shall be provided with combustion, ven­tilation, 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.

9.3.1.5 Makeup air requirements for the operation of exhaust fans, kitchen
ventilation systems, clothes dryers, and fireplaces shall be considered in
determining the adequacy of a space to provide combustion air require­ments.

Required Volume

(2) For fan-assisted appliances, calculate using the following equation:

Required Volume

where:

I

other

I

fan

ACH = air change per hour (percent of volume of space exchanged

(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 con­nect 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.
input rating of all appliances in the space but not less than 100 in.
(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 mini­mum dimension of air openings shall be not less than 3 in. (80 mm).

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 equip­ment in the enclosure, but not
less than 100 square inches.

3

> ________ _________

other

> ________ _________

fan

= all appliances other than fan-assisted input in Btu per

hour

= fan-assisted appliances input in Btu per hour

per hour, expressed as a decimal)

21 ft

ACH 1000 Btu/hr

15 ft

ACH 1000 Btu/hr

2

/1000Btu/hr (2200 mm2/kW) of the total

Chimney or Gas Vent

Furnace

I

other

(

3

(

Water
Heater

)

I

fan

)

Opening

Opening

2

9.3.2 Indoor Combustion Air. The required volume of indoor air shall
be determined in accordance with the method in 9.3.2.1 or 9.3.2.2 ex­cept 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 3 per 1,000/Btu/hour (4.8m3/kW).

9.3.2.2* Known Air Infiltration Rate Method. Where the air infiltra­tion 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 following

equation:

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

different stories shall be considered as communicating spaces where
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).

13

INSTALLATION CONSIDERATIONS

A

9.3.3.1 Two Permanent Openings Method. Two permanent open­ings, one commencing within 12 in. (300 mm) of the top and one com­mencing 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)*Where directly communicating with the outdoors or where commu-

nicating to the outdoors through vertical ducts, each opening shall
have a minimum free area of 1 in.
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).]

2

/4000 Btu/hr (550 min2/kW) of

Chimney or Gas Vent

Water
Heater

Furnace

Outlet air duct

Inlet air duct

NOTE: The air du ct openings
must have a free area of not
less than one sq uare i nch per
2000 BTU of the total input
rating of all equipment in the
enclosure*.

Chimney or Gas Vent

Ventilation louvers
(each end of attic)

NOTE: Th e 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.

Outlet Air

Water
Heater

lternate

air inlet

Furnace

Ventilation louvers for
unheated crawl space

Inlet Air

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.

Chimney or Gas Vent

Ventilation louvers
(each end of attic)

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.

Outlet Air

Water
Heater

Furnace

Inlet air duct
[ends 1 ft (300 mm)
above floor]

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 out­doors 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 mm2 per 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.

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 equip­ment in the enclosure, but not less than
the sum of the areas of all vent
connectors in the confined space.

Chimney or Gas Vent

Water
Heater

Furnace

Opening

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]:

Figure A.9.3.3.1(1)(b) All Combustion Air

From Outdoors through Ventilated Attic.

(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-

(2)*Where communicating with 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 enclo­sure. [See Figure A.9.3.3.1(2).]

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.

14

INSTALLATION CONSIDERATIONS

(c) The minimum size of outdoor opening(s) shall be the 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 installa­tions shall provide an adequate supply of combustion, ventilation, and
dilution air and shall be approved by the authority having jurisdiction.

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
ducts servicing upper and lower combustion air openings shall be main­tained to the source of combustion air.

9.3.8.5 Ducts shall not be screened where terminating in an attic space.

9.3.6 Mechanical Combustion Air Supply. 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 m
the space.

9.3.6.1 Where exhaust fans are installed, additional air shall be provided
to replace the exhausted air.

9.3.6.2 Each of the appliances served shall be interlocked to the me­chanical air supply system to prevent main burner operation where the
mechanical air supply system is not in operation.

9.3.6.3 Where 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
of each opening. Where the free area through a design of louver or grille
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
louvers will have 25 percent free area, and metal louvers and grilles will
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 Combustion Air 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.

3

/min per kW) for all appliances located within

9.3.8.6 Horizontal upper combustion air ducts shall not slope down­ward 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 open­ings located at least 12 in. (300 mm) vertically from the adjoining grade
level.

Horizontal Applications and Considerations

Horizontal applications, in particular, may dictate many of
the installation’s specifics such as airflow direction, duct­work connections, flue and/or combustion air pipe connec­tions, etc. The basic application of this furnace as a hori­zontal furnace differs only slightly from an upright installa­tion.

Horizontal Installations

1. Horizontal installations require 5.5" under the furnace
to accommodate the drain trap.

2. Horizontal furnaces must be installed with ¾” slope from
back to front to permit condensate flow towards the
front of the furnace.

When installing a *MEC96 horizontally with the left side
down, there are two options for connecting the vent pipe to
the furnace.

1. Venting may be connected to the furnace vent pipe fit­ting on the original top (now the end) of the furnace

2. The internal vent pipe and elbow may be removed from
the furnace to permit the vent to exit the top (original
side) of the furnace. If this option is used, an RF000142
Vent-Drain coupling must be used to keep condensate
from collecting in the inducer assembly

Refer to the following instructions and illustration.

9.3.8.2 Ducts shall terminate in an unobstructed space, allowing free
movement of combustion air to the appliances.

15

INSTALLATION CONSIDERATIONS

A

T

A

R 000142F

Insert flange. Cut 2 ½” lo n g.

E
R
E
H

T
U
C

Leveling

Leveling ensures proper condensate drainage from the heat
exchanger and induced draft blower. For proper flue pipe
drainage, the furnace must 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 (approxi­mately 3/4") from the back panel. The slight tilt allows the
heat exchanger condensate, generated in the recuperator
coil, to flow forward to the recuperator coil front cover.

IR

DISCHARGE

Side

Return

Duct

Connection

Bottom

Return

Duct

Connection

Side

Return

Duct

Connection

UPFLOW
UPRIGH

Vent/Flue Pipe Cuts

1. Remove screws from the vent flange.

2. Remove the internal elbow and vent pipe

3. Cut 2 1/2" from the flange .

4. Remove cabinet plug adjacent to inducer outlet and
install an original cabinet vent hole.

5. Install RF000142 coupling on inducer outlet.

6. Install flanged vent section removed in step 2 and se­cure with clamps.

7. Secure flange to cabinet using screws removed in step1.

Drain Trap and Lines

In horizontal applications the condensate drain trap is se­cured to the furnace side panel, suspending it below the
furnace. A minimum clearance of 5.5" below the furnace
must be provided for the drain trap. Additionally, the appro­priate downward piping slope must be maintained from the
drain trap to the drain location. Refer to Condensate Drain
Trap and Lines section in this manual or the installation
instructions for further details. If the drain trap and drain line
will be exposed to temperatures near or below freezing,
adequate measures must be taken to prevent condensate
from freezing. NOTE: The use of insulation and/or heat tape
is recommended. Failure to provide proper condensate drain­age can result in property damage.

Bottom
Return

Duct

Connection

UPFLOW HORIZONTAL

LEFT AIR DISCHARGE

Bottom
Return

Duct

IR

DISCHARGE

UPFLOW HORIZONTAL
RIGHT AIR DISCHARGE

90% Furnace Recommended Installation Positions

Alternate Electrical and Gas Line Connections

The furnaces have provisions allowing for electrical and gas
line connections through either side panel. In horizontal ap­plications the connections can be made either through the
“top” or “bottom” 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
under the furnace (and air conditioning coil if applicable).

16

INSTALLATION CONSIDERATIONS

Freeze Protection

If the drain trap and drain line will be exposed to tempera­tures near or below freezing, adequate measures must be
taken to prevent condensate from freezing. NOTE: The use
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

P

OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF

THE CORRECT CONVERS ION KITS ARE NOT I NSTALLED.

MUST BE APPLIED TO INSURE SAFE AN D PROPER FURNACE OPERATI ON.

CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE

AGENCY .

THE APPROPRIATE KITS

ALL

This furnace is shipped from the factory configured for natu­ral gas at standard altitude. Propane gas installations re­quire an orifice change to compensate for the energy con­tent difference between natural and propane gas.

High altitude installations may require both a pressure switch
and an orifice change. These changes are necessary to com­pensate 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’s kits for propane gas and/or high altitude in­stallations. The indicated kits must be used to insure safe
and proper furnace operation. All conversions must be per­formed by a qualified installer, or service agency.

This furnace must not be connected to Type B, BW, or L
vent or vent connector, and must not be vented into any
portion of a factory built or masonry chimney except when
used as a pathway for PVC as described later in this sec­tion. Never common vent this appliance with another ap­pliance or use a vent which is used by a solid fuel appli­ance.

It is the responsibility of the installer to follow the manufac­turers’ recommendations and to verify that all vent/flue pip­ing and connectors are compatible with furnace flue prod­ucts. Additionally, it is the responsibility of the installer to
ensure that all piping and connections possess adequate
structural integrity and support to prevent flue pipe separa­tion, shifting, or sagging during furnace operation.

Materials and Joining Methods

O AVOID BODILY INJURY, FIRE OR EXPLOSION, SOLVENT CEMENTS MUST BE

T

KEPT AWAY FROM ALL IGNITION SOURCES (I.E., SPARKS, OPEN FLAMES, AND

EXCESSIVE HEAT) AS THEY ARE COMBUSTIBLE LIQUIDS.

CEMENT VAPORS OR CONTACT WITH SKIN AND/OR EYES.

Precautions should be taken to prevent condensate from
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
outdoors in excess of the terminations shown in this manual
(or in unheated areas) should be insulated with 1/2” thick
closed cell foam. Inspect piping for leaks prior to installing
insulation.

WARNING

VOID BREATHING

A

VENT/FLUE PIPE AND COMBUSTION AIR PIPE

WARNING

F

AILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN BODILY INJURY OR

DEATH.

ONLY)

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.

PERSONAL I NJURY OR DEATH D UE TO EXPOSURE TO FLUE PRODUCTS,

INCLUDING CARBON MONOXIDE.

LEAKS IN THE FLUE SYSTEM CAN RESULT IN SERIOUS

A condensing gas furnace achieves its high level of efficiency
by extracting almost all of the heat from the products of
combustion and cooling them to the point where condensa­tion takes place. Because of the relatively low flue gas tem­perature and water condensation requirements, PVC pipe is
used as venting material.

The following bullets and diagram describe the restrictions
concerning the appropriate location of vent/flue pipe and
combustion air intake pipe (when applicable) terminations.
Refer to or the installation instructions for specific details
on termination construction.

• All terminations must be located at least 12 inches
above ground level or the anticipated snow level.

• Vent terminations must terminate at least 3 feet
above any forced air inlet located within 10 feet.

NOTE: This provision does not apply to the combus­tion air intake termination of a direct vent applica­tion.

• The vent termination of a non-direct vent application
must terminate at least 4 feet below, 4 feet horizon­tally from, or 1 foot above any door, window, or grav­ity air inlet into any building.

• The vent termination of a direct vent application must
terminate at least 12 inches from any opening through
which flue gases may enter a building (door, win­dow, or gravity air inlet).

17

INSTALLATION CONSIDERATIONS

• The vent termination of vent pipe run vertically through
a roof must terminate at least 12 inches above the
roof line (or the anticipated snow level) and be at least
12 inches from any vertical wall (including any antici­pated snow build up).

• A vent termination shall not terminate over public walk­ways or over an area where condensate or vapor could
create a nuisance or hazard or could be detrimental
to the operation of regulators, relief valves, or other
equipment.

• The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.

NOTE: In Canada, the B149 Fuel Gas Code takes prece­dence over the preceding termination restrictions.

OTHER THAN

COMBUSTION AIR

TERMINATION INTAKE

NON-DIRECT VENT

VENT/FLUE TERM I NA TION

NO TERMINATIONS

ABOVE WALKWAY

3"

GRADE OR HIGHEST

ANTICIPATED

SNOW LEV EL

FORCED AIR

INLET

10'

VENT/FLUE TERMINATION

12"

12"

12"

DIRECT VENT

VENT/FLUE TERM INATION

4'

4'

12"

NON-DIRECT VENT

90% Furnace Vent Termination Clearances

Vent/Flue Pipe Lengths (Non-Direct Vent) and Diam­eters

Refer to the following tables for applicable length, elbows,
and pipe diameter for construction of the vent/flue pipe sys­tem of a non-direct vent installation. In addition to the vent/
flue pipe, a single 90° elbow must be secured to the com­bustion air intake to prevent inadvertent blockage. The tee
or elbows used in the vent/flue termination must be included
when determining the number of elbows in the piping sys­tem.

Unit In pu t

(Btu)

40,000

60,000

80,000 "B" 2 o r 2 1/2 75 70 65 60 55 50 45 40
80,000 "B" 3 200 193 186 179 172 165 158 151

80,000 "C" 2 o r 2 1/2 25 20 15 10 5 N/A N/A N/A
80,000 "C" 3 200 193 186 179 172 165 158 151

100,000 2 or 2 1/2 25 20 15 10 5 N /A N/A N/A
100,000 3 200 193 186 179 172 165 158 151
120,000 2 or 2 1/2 45 40 35 30 25 20 15 10
120,000 3 95 90 85 80 75 70 65 60

1) Maximum allowable limits listed on individual lengths for inlet and flue and NOT a combination.

2) Minimum requirement for each vent pipe is 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 Configurations 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.

*MEC96 Dire c t Ven t (2 - Pipe) an d N on-Direct Vent (1- Pi p e)

M aximum A l l owable Length of Vent / Fl ue Pi pe

& Combu stion Air Pi p e (ft )

Pipe Si ze

(4)

(in .)

2

or 2 1/2

2

or 2 1/2

12345678

120 115 110 105 100 95 90 85

95 90 85 80 75 70 65 60

Number of Elbows

(1) (2)

(3) (5)

(6)

WARNING

HE RUBBER ELBOW IS NOT DESIGNED TO SUPPORAT A LOAD. WHEN THE

T

RUBBER ELBOW IS MOUNTED EXTERNALLY TO THE FURNACE CABINET,

EXTREME CARE MUST BE TAKEN TO ADEQUATELY SUPPORT FIELD-SUPPLIED

VENT/FLUE PIPIN G, AS DAMAGE CAN RESULT IN LEAKS CAUSING BODILY

INJURY OR DEATH DUE TO EXPOSURE T O FLUE GASES, INCLUDING CARBON

MONOXIDE.

18

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