Goodman *MEC96 User manual



IOG-2011S
01/2021
(Type FSP CATEGORY IV Direct
or Non Direct Vent Air Furnace)
(Type FSP CATÉGORIE IV Direct
ou four á air sou󰀪י non direct)

As a professional installer you have an obligation to know
the product better than the customer. This includes all safety
precautions and related items.
Prior to actual installation, thoroughly familiarize yourself with
this Instruction Manual. Pay special attention to all safety
warnings. Often during installation or repair it is possible to
place yourself in a position which is more hazardous than
when the unit is in operation.
Remember, it is your responsibility to install the product safely
and to know it well enough to be able to instruct a customer
in its safe use.
Safety is a matter of common sense...a matter of thinking
before acting. Most dealers have a list of specic good safety
practices...follow them.
The precautions listed in this Installation Manual are intended
as supplemental to existing practices. However, if there is
a direct conict between existing practices and the content
of this manual, the precautions listed here take precedence.


*NOTE: Please contact your distributor or our website for
the applicable Specication Sheet referred to in this manual.
These furnaces comply with requirements
embodied in the American National
Standard / National Standard of Canada
ANSI Z21.47·CSA-2.3 Gas Fired Central
Furnaces.
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 .
Cancer and Reproductive Harm -
www.P65Warnings.ca.gov
19001 Kermier Rd. Waller, Tx 77484
www.goodmanmfg.com•www.amana-hac.com
© 2014-2021 Goodman Manufacturing Company, L.P.
is a registered trademark of Maytag Corporation or its related companies and is
used under license. All rights reserved.
90% HEX
DO NOT LIFT
PRODUCT USING
HEAT EXCHANGER

2
Table of Contents
 3
 5
 5
 6
 10
 10
 11
 11
 18
 23
 26
 29
 32
 34
 49
 50
 50
 51
 53
 54
 54
 55
 57

3


FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame.
Use a commercially available soap solution made
specifically for the detection of leaks to check all
connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
RISQUE D'INCENDIE OU D'EXPLOSION
Si les consignes de sécurité ne sont pas suivies à la lettre,
cela peut entraîner la mort, de graves blessures ou des
dommages matériels.
Ne jamais vérifier la présence de fuites de gaz au moyen
d'une flamme nue. Vérifier tous les raccords en utilisant
une solution savonneuse commerciale conçue
spécialement pour la détection de fuites. Un incendie ou
une explosion risque de se produire, ce qui peut entraîner
la mort, des blessures ou des dommages matériels.

Adhere to the following warnings and cautions when install-
ing, adjusting, altering, servicing, or operating the furnace.
To ensure proper installation and operation, thoroughly read
this manual for specics pertaining to the installation and
application of this product.
This furnace is manufactured for use with natural gas. It
may be eld converted to operate on L.P. gas by using the
appropriate L.P. conversion kit listed in the 
section of this manual
Install this furnace only in a location and position as specied
in    
section and  section of this
manual.
Provide adequate combustion and ventilation air to the fur-
nace as specied in 

Combustion products must be discharged to the outdoors.
Connect this furnace to an approved vent system only, as
specied in 
section of this manual.
Never test for gas leaks with an open ame. Use a com-
mercially available soap solution made specically for the
detection of leaks to check all connections, as specied in
 section of this manual.
Always install a furnace to operate within the furnace’s
intended temperature-rise range with a duct system which
has external static pressure within the allowable range, as
specied on the furnace rating plate and 
 section of these instructions.
When a furnace is installed so that supply ducts carry air cir-
culated by the furnace to areas outside the space containing
the furnace, the return air shall also be handled by duct(s)
sealed to the furnace casing and terminating outside the
space containing the furnace.
FROZEN AND BURST WATER PIPE HAZARD
F AILURE TO PROTECT AGAINST THE RISK OF FREEZING MAY RESULT IN
PROPERTY DAMAGE .
S
PECIAL PRECAUTIONS MUST BE MADE IF INSTALLING FURNACE IN AN
AREA WHICH MAY DROP BELOW FREEZING . T HIS CAN CAUSE IMPROPER
OPERATION OR DAMAGE TO EQUIPMENT . I F THE FURNACE
ENVIRONMENT HAS THE POTENTIAL OF FREEZING , THE DRAIN TRAP AND
DRAIN LINE MUST BE PROTECTED . T HE USE OF ACCESSORY DRAIN TRAP
HEATERS , ELECTRIC HEAT TAPE AND / OR RV ANTIFREEZE IS
RECOMMENDED FOR THESE INSTALLATIONS .

A gas-red furnace for installation in a residential garage
must be installed as specied in the 
 section of this manual.
This furnace may be used as a construction site heater only
if certain conditions are met. These conditions are listed in
the  section of this manual.
T O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER
INSTALLATION , ADJUSTMENT , ALTERATION , SERVICE OR MAINTENANCE ,
REFER TO THIS MANUAL . F OR ADDITIONAL ASSISTANCE OR
INFORMATION , CONSULT A QUALIFIED INSTALLER , SERVICER AGENCY OR
THE GAS SUPPLIER .

I F THE
INFORMATION IN THESE
INSTRUCTIONS
IS NOT FOLLOWED
EXACTLY , A FIRE
OR EXPLOSION MAY RESULT
CAUSING PROPERTY
DAMAGE
, PERSONAL INJURY OR LOSS OF LIFE .
D O NOT STORE
OR USE GASOLINE OR
OTHER FLAMMABLE VAPORS
AND
LIQUIDS
IN THE VICINITY OF THIS OR ANY
OTHER APPLIANCE .
D
O NOT TRY TO LIGHT ANY APPLIANCE .
D
O NOT
TOUCH ANY ELECTRICAL SWITCH ; DO NOT USE ANY PHONE
IN YOUR BUILDING
.
I
MMEDIATELY CALL YOUR GAS
SUPPLIER FROM A NEIGHBOR
’ S
PHONE . F OLLOW THE
GAS SUPPLIER ’ S INSTRUCTIONS
.
I
F YOU CANNOT REACH YOUR GAS SUPPLIER , CALL THE FIRE
DEPARTMENT .
I
NSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED
INSTALLER , SERVICE AGENCY OR THE GAS SUPPLIER .
WHAT TO DO IF YOU SMELL GAS:
�
�
�
�


4
H EATING UNIT SHOULD NOT BE UTILIZED WITHOUT REASONABLE ,
ROUTINE , INSPECTION , MAINTENANCE AND SUPERVISION . I F THE
BUILDING IN WHICH ANY SUCH DEVICE IS LOCATED WILL BE VACANT ,
CARE SHOULD BE TAKEN THAT SUCH DEVICE IS ROUTINELY INSPECTED ,
MAINTAINED AND MONITORED . IN THE EVENT THAT THE BUILDING
MAYBE EXPOSED TO FREEZING TEMPERATURES AND WILL BE VACANT ,
ALL WATER - BEARING PIPES SHOULD BE DRAINED , THE BUILDING SHOULD
BE PROPERLY WINTERIZED , AND THE
WATER SOURCE CLOSED . IN THE
EVENT THAT THE BUILDING MAY BE EXPOSED TO FREEZING
TEMPERATURES AND WILL BE VACANT , ANY HYDRONIC COIL UNITS
SHOULD BE DRAINED AS WELL AND , IN SUCH CASE , ALTERNATIVE HEAT
SOURCES SHOULD BE UTILIZED .

T O PREVENT POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR
DEATH DUE TO ELECTRICAL SHOCK , THE FURNACE MUST BE LOCATED TO
PROTECT THE ELECTRICAL COMPONENTS FROM WATER .

Drain trap must be primed at time of installation. Trap is in-
ternally partitioned; add water to both inlet ports until water
appears at both sides of the outlet opening. Failure to prime
trap at time of installation may have a negative e󰀨ect on
combustion quality and pressure switch action.

All units are securely packed in shipping containers tested
according to International Safe Transit Association specica-
tions. The carton must be checked upon arrival for external
damage. If damage is found, a request for inspection by
carrier’s agent must be made in writing immediately.
The furnace must be carefully inspected on arrival for damage
and bolts or screws which may have come loose in transit.
In the event of damage the consignee should:
1. Make a notation on delivery receipt of any visible
damage to shipment or container.
2. Notify carrier promptly and request an inspection.
3. With concealed damage, carrier must be notied as
soon as possible - preferably within ve days.
4. File the claim with the following support documents
within a nine month statute of limitations.
• Original or certied copy of the Bill of Lading, or
indemnity bond.
• Original paid freight bill or indemnity in lieu thereof.
• Original or certied copy of the invoice, showing
trade and other discounts or reductions.
• Copy of the inspection report issued by carrier’s
representative at the time damage is reported to
carrier.
The carrier is responsible for making prompt inspection of
damage and for a thorough investigation of each claim. The
distributor or manufacturer will not accept claims from dealers
for transportation damage.
S HOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF ,
TURN OFF THE MANUAL GAS SHUTOFF VALVE EXTERNAL TO THE
FURNACE BEFORE TURNING OFF THE ELECTRICAL SUPPLY .

P OSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , EXPLOSION , SMOKE , SOOT , CONDENSATION , ELECTRICAL SHOCK
OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION ,
REPAIR OPERATION , OR MAINTENANCE OF THIS PRODUCT .



 Discharge your body’s static electricity before
touching unit. An electrostatic discharge can adversely a󰀨ect
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
non-installed (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
furnaces 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 shu󰀪e 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 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.

Before installing this unit, please read this manual thoroughly
to familiarize yourself with specic items which must be ad-
hered to, including but not limited to: unit maximum external
static pressure, gas pressures, BTU input rating, proper elec-
trical connections, circulating air temperature rise, minimum
or maximum CFM, and motor speed connections.
T O PREVENT PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , DO
NOT INSTALL THIS FURNACE IN A MOBILE HOME ,
TRAILER , OR
RECREATIONAL VEHICLE .


5


The *MEC96 furnace may be installed upow or horizon-
tally with left or right side down. The *CEC96 furnace may
be installed downow or horizontally with left or right side
down. *MEC96 & *CEC96 two-stage gas furnaces features
a multi-speed ECM indoor fan motor, two heating inputs (W1
& W2), two cooling inputs (YLO & Y) and a two stage gas
valve. A single stage heating thermostat may also be used
in conjunction with timed transition to high re by the furnace
integrated control board.

This furnace is primarily designed for residential home-heat-
ing applications. It is NOT designed or certied for use in
mobile homes, trailers or recreational vehicles. Neither is it
designed or certied for outdoor applications. The furnace
must be installed indoors (i.e., attic space, crawl space, or
garage area provided the garage area is enclosed with an
operating door).
This furnace can be used in the following non-industrial
commercial applications:
Schools, O󰀩ce buildings, Churches, Retail stores, Nursing
homes, Hotels/motels, Common or o󰀩ce areas
In such applications, the furnace must be installed with the
following stipulations:
• It must be installed per the installation instructions
provided and per local and national codes.
• It must be installed indoors in a building constructed
on site.
• It must be part of a ducted system and not used in
a free air delivery application.
B10259-216
CO can cause serious illness including permanent brain
damage or death.
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 causer des maladies graves telles que
dommages permanents au cerveau et meme la mort.
Cette ventilation est nécessaire pour éviter le danger d'intoxication
au CO pouvant survenir si un appareil produisant du monoxyde
de carbone continue de fonctionner au sein de la zone confinée.
• It must not be used as a “make-up” air unit.
• It must be installed as a two-pipe system for
combustion air.
• All other warranty exclusions and restrictions apply
This furnace is an ETL dual-certied appliance and
is appropriate for use with natural or propane gas
(If using propane, a propane conversion kit
is required).
Dual certication 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 these instructions.
This furnace may be used as a construction site heater 
if all of the following conditions are met:
• The vent system is permanently installed per these
installation instructions.
• A room thermostat is used to control the furnace.
Fixed jumpers that provide continuous heating
CANNOT be used and can cause long term
equipment damage. Bi-metal thermostats, or any
thermostat a󰀨ected by vibration must not be used
during construction.

6
• Return air ducts are provided and sealed to the
furnace.
• A return air temperature range between 60ºF (16ºC)
and 80ºF (27ºC) is maintained.
• MERV 11 (Example P/N AMP-11-2025-45) air
lter(s) are installed in the system and inspected
daily and replaced as needed during construction
and upon completion of construction.
• The input rate and temperature rise are set per the
furnace rating plate.
• The furnace must be installed as a two pipe system,
using 100% outside air for combustion during
construction.
• The furnace heat exchanger, components,
duct system, air lters and evaporator coils are
thoroughly cleaned following nal construction clean
up by a qualied person.
• All furnace operating conditions (including ignition,
input rate, temperature rise and venting) are veried
by a qualied person according to these installation
instructions.
• Furnace doors must be in place on the furnace while
the furnace is operating in any mode.
• Damage or repairs due to failure to comply with
these requirements are not covered under the
warranty.
 The Commonwealth of Massachusetts requires
that the following additional requirements must also be met:
• Gas furnaces must be installed by a licensed
plumber or gas tter.
• A T-handle gas cock must be used.
• If the unit is to be installed in an attic, the passageway
to and the service area around the unit must have
ooring.
To ensure proper furnace operation, install, operate and
maintain the furnace in accordance with these installa
tion and operation instructions, all local building codes
 In their absence, follow the latest edition
of the National Fuel Gas Code (NFPA 54/ANSI Z223.1), and/
or CAN/CSA B149.1-15 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:

25 West 43rd Street, 4th Floor
New York, NY 10036
 
1 Batterymarch Park
Quincy, MA 02169-7471
 
8501 East Pleasant Valley
Independence, OH 44131
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 Con-
tractors of America.
A copy of the CAN/CSA B149.1-15 Installation Codes can
also be obtained from:

178 Rexdale Boulevard
Etobicoke, Ontario, Canada M9W 1R3


Follow the instructions listed below and the guidelines provided
in the Combustion and Ventilation Air Requirements section
when selecting a furnace location.
P OSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , EXPLOSION , SMOKE , SOOT , CONDENSATION , ELECTRICAL SHOCK
OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION ,
REPAIR OPERATION , OR MAINTENANCE OF THIS PRODUCT .

T O PREVENT POSSIBLE EQUIPMENT DAMAGE , PROPERTY DAMAGE ,
PERSONAL INJURY OR DEATH , THE FOLLOWING BULLET POINTS MUST BE
OBSERVED WHEN INSTALLING THIS UNIT .

• 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.
• Provide provisions for venting combustion products
outdoors through a proper venting system.
Special consideration should be given to vent/
ue pipe routing and combustion air intake pipe
when applicable. Refer to Vent/Flue Pipe and
Combustion Air Pipe -Termination Locations for
appropriate termination locations and to determine
if the piping system from furnace to termination can
be accomplished within the guidelines given. 
The length of ue and/or combustion air piping can
be a limiting factor in the location of the furnace.
• Locate the furnace so condensate ows downwards
to the drain. Do not locate the furnace or its
condensate drainage system in any area subject to
below freezing temperatures without proper freeze
protection. Refer to Condensate Drain Lines and
Trap for further details.
• Ensure adequate combustion air is available for
the furnace. Improper or insu󰀩cient combustion air
can expose building occupants to gas combustion
products that could include carbon monoxide. Refer
to Combustion and Ventilation Air Requirements.

7
• Set the furnace on a level oor to enable proper
condensate drainage. If the oor becomes wet or
damp at times, place the furnace above the oor on
a concrete base sized approximately 1-1/2” larger
than the base of the furnace. Refer to the Horizontal
Applications and Considerations for leveling of
horizontal furnaces.
• Ensure upow or horizontal furnaces are not installed
directly on carpeting, or any other combustible
material. The only 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
exposed to the following substances:
permanent wave solutions
carbon tetrachloride
deicing salts or chemicals
cleaning solutions (such as perchloroethylene)
paint removers
cements and glues
chlorinated waxes or cleaners
water softening chemicals
halogen type refrigerants
chlorine-based swimming pool chemicals
printing inks
varnishes
hydrochloric acid
antistatic fabric softeners for clothes dryers
• Seal o󰀨 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 supply of combustion air, vent from a
nearby uncontaminated room or from outdoors.
Refer to the Combustion and Ventilation Air
Requirements for details.
• If the furnace is used in connection with a cooling
coil unit, install the furnace upstream or in parallel
with the cooling coil unit. Premature heat exchanger
failure will result if the cooling unit is placed ahead
of the furnace.
For vertical (upow or downow) applications, the
minimum cooling coil width shall not be less than
furnace width minus 1”. Additionally, a coil installed
above an upow furnace or under a counterow
furnace may be the same width as the furnace or
may be one size larger than the furnace. Example:
a “C” width coil may be installed with a “B” width
furnace. For upow applications, the front of the coil
and furnace must face the same direction.
• If the furnace is installed in a residential garage,
position the furnace so that the burners and ignition
source are located not less than 18 inches (457 mm)
above the oor. Protect the furnace from physical
damage by vehicles.
• If the furnace is installed horizontally, ensure the
access doors are not on the “up/top” or “down/
bottom” side of the furnace.
• Do not connect this furnace to a chimney ue that
serves a separate appliance designed to burn solid
fuel.
• On Counterow Installations, the air conditioning coil
must be downstream on the supply (positive) side
of the furnace heat exchanger.
• Counterow Installation over a noncombustible oor.
Before setting the furnace over the plenum opening,
ensure the surface around the opening is smooth
and level. A tight seal should be made between the
furnace base and oor by using a silicone rubber
caulking compound or cement grout.
• Counterow Installation over a combustible oor.
If installation over a combustible oor becomes
necessary, use an accessory subbase (see
Specication Sheet applicable for your model for
details.) A special accessory subbase must be
used for upright counterow unit installations over
any combustible material including wood. Refer
to subbase instructions for installation details.
Follow the instructions with the subbase for proper
installation. Do not install the furnace directly on
carpeting, tile, or other combustible material other
than wood ooring.
: The subbase will not be required if an air conditioning
coil is installed between the supply air opening on the furnace
and the oor.


• For servicing or cleaning, a 24” front clearance is
required.
• Unit connections (electrical, ue and drain) may
necessitate greater clearances than the minimum
clearances listed above.
• In all cases, accessibility clearance must take
precedence over clearances from the enclosure
where accessibility clearances are greater.

• For servicing or cleaning, a 24” front clearance is
required.
• Unit connections (electrical, ue and drain) may
necessitate greater clearances than the minimum
clearances listed above.
• In all cases, accessibility clearance must take
precedence over clearances from the enclosure
where accessibility clearances are greater.

8
Clearance in accordance with local installation codes, the
requirements of the gas supplier and the manufacturer's
installation instructions.
Dégaugement conforme aux codes d'installation locaux, aux
exigences du fournisseur de gaz et aux instructions
d'installation du fabricant.
Installations must adhere to the clearances to combustible
materials to which this furnace has been design certied. The
minimum clearance information for this furnace is provided
on the unit’s clearance label. These clearances must be per-
manently maintained. Clearances must also accommodate
an installation’s gas, electrical, and drain trap and drain line
connections. If the alternate combustion air intake or vent/ue
connections are used additional clearance must be provided
to accommodate these connections. Refer to Vent/Flue Pipe
and Combustion Air Pipe for details.
 In addition to the required clearances to combustible
materials, a minimum of 24 inches service clearance must
be available in front of the unit.
POSITION* SIDES REAR FRONT BOTTOM FLUE TOP
Upflow 0" 0" 3" C0" 1"
Horizontal 6" 0" 3" C0" 6"
C = If placed on combustible floor, floor MUST be wood only.
*M EC96 M INIMUM CLEARANCES TO COM BUSTIBLE M ATERIALS
(INCHES)
POSITION* SIDES REAR FRONT BOTTOM FLUE TOP
Counterflow 0" 0" 3" NC 0" 1"
Horizontal 6" 0" 3" C0" 6"
C = If placed on combustible floor, floor MUST be wood only.
NC = For installation on non-combustible floors only. A combustible subbase
must be used for installations on combustible flooring.
*CEC96 MINIMUM CLEARANCES TO COMBUSTIBLE M ATERIALS
(INCHES)
TOP
BOTTOM
TOP
BOTTOM

A furnace installed in a conned space (i.e., a closet or utility
room) must have two ventilation openings with a total min-
imum free area of 0.25 square inches per 1,000 BTU/hr of
furnace input rating. Refer to Specication Sheet applicable to
your model for minimum clearances to combustible surfaces.
One of the ventilation openings must be within 12 inches of
the top; the other opening must be within 12 inches of the
bottom of the conned space. In a typical construction, the
clearance between the door and door frame is usually ade-
quate to satisfy this ventilation requirement.
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being placed
into operation could result in carbon monoxide poisoning
or death.
The following steps shall be followed with each appliance
connected to the venting system placed in operation,
while any other appliances connected to the venting
system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and
horizontal pitch, as required by the National Fuel Gas
Code, ANSI Z223.1 or the Natural Gas and Propane
Installation Code, CSA B149.1-15 and these
instructions. Determine that there is no blockage or
restriction, leakage, corrosion and other deficiencies
which could cause an unsafe condition.
3. As far as practical, close all building doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system are
located and other spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not
connected to the venting system. Turn on any
exhaust fans, such as range hoods and bathroom
exhausts, so they shall operate at maximum speed.
Donot operate a summerexhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
appliance shall operate continuously.
7. Test for spillage from draft hood appliances at the
draft hood relief opening after 5 minutes of main
burner operation. Use the flame of a match or
candle.
8. If improper venting is observed during any of the
above tests, the venting system must be corrected in
accordance with the National Fuel Gas Code ANSI
Z223.1/NFPA 54 and/or National Gas and Propane
Installation Code CSA B149.1-15.
9. After it has been determined that each appliance
connected to the venting system properly vents
when tested as outlined above, return doors,
windows, exhaust fans, fireplace dampers and any
other gas burning appliance to their previous
conditions of use.


9
RISQUE D'INTOXICATION AU MONOXYDE DE CARBONE
Si les étapes décrites ci-dessous ne sont pas suivies pour
chacun des appareils raccordés au système de ventilation
au moment de sa mise en marche, cela peut entraîner une
intoxication au monoxyde de carbone ou la mort. Les
étapes suivantes doivent être suivies pour chacun des
appareils raccordés au système de ventilation au moment
de sa mise en marche, alors que tous les autres appareils
raccordés au système de ventilation ne sont pas en
marche :
1) Sceller toutes les ouvertures inutilisées du système de
ventilation.
2) Inspecter le système de ventilation afin de vérifier si la
taille et l'inclinaison par rapport à l'horizontale sont
conformes aux exigences du National Fuel Gas Code, ANSI
Z223.1/NFPA 54 ou du Code d'installation du gaz naturel
et du propane, CSA B149.1 et à ces instructions. Vérifier
qu'il n'y a pas d'obstruction ou de restriction, de fuite, de
corrosion et d'autres problèmes qui pourraient entraîner
une situation dangereuse.
3) Si possible, fermer toutes les portes et fenêtres du
bâtiment ainsi que toutes les portes séparant l'endroit où
se trouvent les appareils raccordés au système de
ventilation et les autres zones du bâtiment.
4) Fermer le registre des foyers.
5) Mettre les sécheuses en marche ainsi que tous les
autres appareils qui ne sont pas raccordés au système de
ventilation. Mettre en marche tous les ventilateurs de
tirage, comme celui des hottes de cuisine et des salles de
bains, et les régler à la puissance maximale. Ne pas mettre
en marche les ventilateurs d'été.
6) Suivre les instructions d'allumage. Mettre en marche
l'appareil soumis à l'inspection. Régler le thermostat de
manière à ce que l'appareil fonctionne en continu.
7) Vérifier la présence de fuite au niveau de l'ouverture du
coupe-tirage des appareils qui en sont dotés après 5
minutes de fonctionnement du brûleur principal. Utiliser
la flamme d'une allumette ou d'une bougie.
8) Si un problème de ventilation est observé pendant l'un
des essais décrits ci-dessus, des correctifs doivent être
apportés au système de ventilation conformément au
National Fuel Gas Code, ANSI Z223.1/NFPA 54 et (ou) au
Code d'installation du gaz naturel et du propane, CSA
B149.1.
9) Une fois qu'il a été déterminé que chaque appareil
raccordé au système de ventilation fonctionne
correctement au moyen des essais décrits ci-dessus, les
portes, les fenêtres, les ventilateurs, les registres de foyer
et tous les autres appareils de combustion alimentés au
gaz doivent être remis dans leur état initial.


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 repro duced from
the   
       

The following steps shall be followed with each appliance
connected to the venting system placed in operation, while
any other appliances connected to the venting system are
not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and hor-
izontal pitch, as required by the National Fuel Gas
Code, ANSI Z223.1 or the Natural Gas and Propane
Installation Code, CSA B149.1-15 and these instruc-
tions. Determine that there is no blockage or restriction,
leakage, corrosion and other deciencies which could
cause an unsafe condition.
3. As far as practical, close all building doors and windows
and all doors between the space in which the appli-
ance(s) connected to the venting system are located
and other spaces of the building.
4. Close replace dampers.
5. Turn on clothes dryers and any appliance not connect-
ed to the venting system. Turn on any exhaust fans,
such as range hoods and bathroom exhausts, so they
shall operate at maximum speed. Do not operate a
summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
appliance shall operate continuously.
7. Test for spillage from draft hood appliances at the draft
hood relief opening after 5 minutes of main burner
operation. Use the ame of a match or candle.
8. If improper venting is observed during any of the above
tests, the venting system must be corrected in accor-
dance with the National Fuel Gas Code ANSI Z223.1/
NFPA 54 and/or National Gas and Propane Installation
Code CSA B149.1-15.
9. After it has been determined that each appliance
connected to the venting system properly vents when
tested as outlined above, return doors, windows,
exhaust fans, replace dampers and any other gas
burning appliance to their previous conditions of use.
If resizing is required on any portion of the venting system,
use the appropriate table in Appendix G in the latest edi-
tion of the National Fuel Gas Code ANSI Z223.1 and/or
CSA B149.1-15 Installation Codes.

10

The thermostat should be placed approximately ve feet from
the oor on a vibration-free, inside wall in an area having
good air circulation. Do not install the thermostat where it
may be inuenced by any of the following:
• Drafts, or dead spots behind doors, in corners, or
under cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
• Light xtures or other appliances.
• Radiant heat from a replace.
• Concealed hot or cold water pipes, or chimneys.
• Unconditioned areas behind the thermostat, such
as an outside wall.
Consult the instructions packaged with the thermostat
for mounting instructions and further precautions.


T O AVOID PROPERTY DAMAGE , PERSONAL INJURY OR DEATH ,
SUFFICIENT FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF
FLUE GASES MUST BE SUPPLIED . M OST HOMES REQUIRE OUTSIDE AIR BE
SUPPLIED INTO THE FURNACE AREA .

Improved construction and additional insulation in buildings
have reduced heat loss by reducing air inltration 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 red and
other fuel burning appliances. Appliances that pull air out
of the house (clothes dryers, exhaust fans, replaces, etc.)
increase the problem by starving appliances for air.
House depressurization can cause back drafting or improper
combustion of gas-red appliances, thereby exposing build-
ing occupants to gas combustion products that could include
carbon monoxide.
If this furnace is to be installed in the same 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 or CAN/CSA B149.1-
15 Installation Codes or applicable provisions of the local
building codes for determining the combustion air require-
ments for the appliances.
Most homes will require outside air be supplied to the fur-
nace 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.






11

*MEC96 models may be installed upow or horizontally with
left or right side down. *CEC96 models may be installed down
ow or horizontally with left or right side down. Do not install this
furnace on its back. For upright upow furnaces, return air
ductwork may be attached to the side panel(s) and/or base-
pan. For horizontal upow furnaces, return air ductwork must
be attached to the basepan. For both upright or horizontal
counterow furnaces, return ductwork must be attached to
the basepan (top end of the blower compartment).
Ductwork must never be attached to the back of the furnace.
Refer to “Recommended Installation Positions” gure for
appropriate installation positions, ductwork connections, and
resulting airow arrangements.


When installing a furnace horizontally, additional consider-
ation must be given to the following:

If suspending the furnace from rafters or joists, use 3/8”
threaded rod and 2”x2”x1/8” angle iron as shown in the
following diagram. The length of rod will depend on the
application and the clearances necessary.
If the furnace is installed in a crawl space it must be sus-
pended from the oor joist or supported by a concrete pad.
Never install the furnace on the ground or allow it to be
exposed to water.
2" 2" 3/8" ANGLE IRON
(3 PLACES )
X X



When a furnace is installed horizontally with left side down,
the front cover pressure switch tube must be re-located to
he lower port of the collector box cover.
1. Remove tube from front cover pressure switch and
collector box cover.
2. Remove rubber plug from bottom collector box port and
install on top of collector box port.
3. Locate 24’’ x 1/4’’ tube in bag assembly.
4. Install one end on front cover pressure switch.
5. Route tube to lower port on collector box cover and cut
o󰀨 excess tubing.

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 provid-
ed 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 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.

Leveling ensures proper condensate drainage from the heat
exchanger. For proper ue pipe drainage, the furnace must
be level lengthwise from end to end. The furnace should have
a slight tilt from back to front with the access doors downhill
from the back panel approximately 1/2 to 3/4 inches. The
slight tilt allows the heat exchanger condensate, generated
in the recuperator coil, to ow forward to the recuperator coil
front cover.


This furnace has 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.

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).

Refer to Horizontal Applications and Conditions - Drain Trap
and Lines.



POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY
OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED. THE
APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER
FURNACE OPERATION. ALL CONVERSIONS MUST BE PERFORMED BY A
QUALIFIED INSTALLER OR SERVICE AGENCY.
This furnace is shipped from the factory congured for natural
gas at standard altitude. Propane gas installations require
an orice and spring change to compensate for the energy
content di󰀨erence between natural and propane gas.

12
High altitude installations may require both a pressure switch
and an orice/spring 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.
For furnaces being converted to LP gas, it is strongly rec-
ommended that a LPLP03 kit also be installed. The use of
this kit will prevent the furnace from ring when the LP gas
supply pressure is too low to support proper combustion.
Installation of this furnace at altitudes above 7000 ft (2134 m)
shall be made in accordance with the Listed High Altitude
Conversion Kit available with this furnace.”
L'installation de ce générateur de chaleur à des altitudes
supérieures à 7000 pi (2134 m) doit être effectuée
conformément aux instructions accompagnant la trousse de
conversion pour haute altitude fournie avec cet appareil.
For installations above 7000 feet, please refer to the furnace
Specication Sheets for required kit(s).
Contact the distributor 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 per-
formed by a qualied installer, or service agency.
HIGH STAGE LOW STAGE
#45 (1)
#50 (2)
LPM-08* (1) 1.25MM (1)
LPM-30* (2) #57 (2)
*supports both Honeywell and White-Rodgers 2-stage valves
(1) FOR USE WITH ALL MODELS EXCEPT *MEC960303AN and *MEC960302BN
(2) FOR USE WITH ONLY *MEC960302BN MODEL
NATURAL
0 - 7000
NONE
3.5" w.c.
1.9" w.c.
NONE
PROPANE
10.0" w.c.
6.0" w.c.
NONE
GAS
ALTITUDE
KIT
ORIFICE
MANIFOLD PRESSURE
PRESSURE SWITCH
CHANGE

F AILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN BODILY
INJURY OR DEATH . C AREFULLY READ AND FOLLOW ALL INSTRUCTIONS
GIVEN IN THIS SECTION .

U
PON COMPLETION OF THE FURNACE
INSTALLATION , CAREFULLY
INSPECT THE ENTIRE
FLUE SYSTEM BOTH
INSIDE AND OUTSIDE
OF THE
FURNACE TO ASSURE IT IS PROPERLY SEALED . L EAKS IN THE FLUE
SYSTEM CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH DUE TO
EXPOSURE TO FLUE PRODUCTS , INCLUDING CARBON MONOXIDE .

This manual will refer to the pipe that discharges products of
combustion to the outdoors as the “vent” pipe or “ue” pipe.
The pipe that supplies air for combustion to the furnace will
be referred to as the “intake” pipe or “combustion air” pipe.
This furnace is dual certied and may be installed as a non-
direct vent (single pipe) or direct vent (dual pipe) appliance.
MA
PVC, CPVC, or ABS pipe & ttings are typically used as
venting and intake pipe materials. All 90° elbows must be
medium or long radius types. A medium radius elbow should
measure ~3-1/16” minimum from the plane of one opening
to the center line of the other opening for 2” diameter pipe,
and ~4-9/16” minimum for 3” pipe.
In addition to these materials, Innoue® by Centrotherm
Eco Systems and PolyPro® by M&G Duravent are also
approved vent and combustion air materials for installations
in the U.S.A. Manufacturers Installation instructions for these
products must be followed. These products have specic
instructions for installing, joining and terminating. Do not mix
materials or components of one manufacturer with materials
or components of another manufacturer. Refer to the following
chart for plastic pipe & ttings specications
M
All installations in Canada must conform to the requirements
of CAN/CSA B149.1-15 code. All vent components, including
primer and cement, must be listed to ULC S636. The certied
pipe and ttings should be clearly marked with the ULC
standard “S636”. The primer and cement used must be of
the same manufacturer as the vent system. For Royal Pipe
System 636; use GVS-65 Primer (Purple) and GVS-65 PVC
Solvent Cement. For IPEX System 636, use PVC/CPVC
Primer, Purple or clear. Use PVC Solvent cement (Gray). For
Canadian installations, ABS may be used as a combustion air
pipe only. ABS is not an approved vent material in Canada.
If ABS is used as a combustion air pipe, it must be CSA
certied. Always follow the manufacturer’s instructions in the
use of primer and cement. Do not use primer and cement
around potential sources of ignition. Do not use primer or
cement beyond its expiration date.

T O AVOID BODILY INJURY , FIRE
OR EXPLOSION , SOLVENT CEMENTS
MUST BE KEPT AWAY
FROM ALL IGNITION SOURCES
( I . E ., SPARKS , OPEN
FLAMES , AND EXCESSIVE HEAT ) AS THEY ARE COMBUSTIBLE LIQUIDS .
A
VOID BREATHING CEMENT VAPORS OR CONTACT WITH SKIN AND / OR
EYES .


13
PVC ASTMSTANDARD
SCHEDULE40PIPE D1785
SCHEDULE40CELLULARCOREPIPE F891
SDR21OR26PIPE D2241
FITTINGS D2466
ABS
SCHEDULE40PIPE D1527
SCHEDULE40CELLULARCOREPIPE F628
FITTINGS D2468
CPVC
SCHEDULE40PIPE F441
SDR21OR26PIPE F442
FITTINGS F438
POLYPROPYLENE
INNOFLUE®(CENTROTHERM)
POLYPRO®(DURAVENT)
PRIMER&SOLVENTCEMENT
PVCPRIMER F656
CPVCPRIMER F656
PVCSOLVENTCEMENT D2564
CPVCSOLVENTCEMENT F493
ABSSOLVENTCEMENT D2235
ABS/PVC/CPVCALLPURPOSECEMENT(FORPIPE&
FITTINGSOFTHESAMEMATERIAL) D2564,D2235,F493
TRANSITIONCEMENTFORABSTOPVCorCPVC D3188
INSTALLATIONSINCANADA
PVC&CPVCPIPE&FITTINGS
PVC&CPVCSOLVENTCEMENT
TRANSITIONCEMENT
INNOFLUE®(CENTROTHERM)
POLYPRO®(DURAVENT)
VENTINGMATERIALREQUIREMENTS
ULCS636



















PREFERRED

TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
ACCEPTABLE

NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATES A
WATER TRAP AND
RESTRICTS FLUE
GASES


14

Non-Direct Vent
Vent/Flue Termination
No Terminations
Above Walkway
Non-Direct Vent
Vent/Flue Termination
Direct Vent
Vent/Flue Termination
Forced Air
Inlet
Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
Grade or Highest
Anticipated
Snow Level


VENT-DRAIN







Insert flange. Cut 2 ½” long. RF000142
SEE FIGURE 8


15
12345678
275 70 65 60 55 50 45 40
3114 107 100 93 86 79 72 65
275 70 65 60 55 50 45 40
3114 107 100 93 86 79 72 65
2100 95 90 85 80 75 70 65
3168 161 154 147 140 133 126 119
250 45 40 35 30 25 20 15
3143 136 129 122 115 108 101 94
260 55 50 45 40 35 30 25
3113 106 99 92 85 78 71 64
260 55 50 45 40 35 30 25
3120 113 106 99 92 85 78 71
245 40 35 30 25 20 15 10
3103 96 89 82 75 68 61 54
245 40 35 30 25 20 15 10
3151 144 137 130 123 116 109 102
*M EC961205DN 3185 178 171 164 157 150 143 136
2100 95 90 85 80 75 70 65
3110 103 96 89 82 75 68 61
245 40 35 30 25 20 15 10
3110 103 96 89 82 75 68 61
235 30 25 20 15 10 5NA
3103 96 89 82 75 68 61 54
245 40 35 30 25 20 15 10
3110 103 96 89 82 75 68 61
*MEC96/*CEC96 Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
(6)
Maximum Allowable Length of Vent/Flue Pipe
M ODEL
Pipe Size
(4)
(in.)
Number of Elbows
(3) (5)
*M EC960303AN
&
*M EC960403AN
*M EC960603AN
*M EC960302BN
&
*M EC960402BN
*M EC960603BN^
*M EC960803BN
*M EC960804CN
*M EC961004CN
*M EC961005CN
*CEC960403BN
*CEC960603BN
*CEC960803BN
*CEC961005CN
^ *MEC960603BN-add 45' of 2" pipe for upflow.











16



or











6” MAX



Vent Pipe
Use alternate vent
& combination
air locations
Combustion Air Pipe
Field Supplied
Drain Tee on Vent Pipe
Condensate trapped
to prevent flue gas from escaping
and routed to field supplied
condensate disposal
1/4” per foot min.
slope to furnace
6’ Max.
Floor
Basement/Crawlspace
DOWN VENTING UPFLOW MODEL FURNACES ONLY
All piping and fittings must be joined per material manufacturers specifications
to prevent separation and flue gas leaks.


The RF000142 coupling (Figure 8) can be secured directly
to the furnace intake coupling if condensation is a concern.
If the RF000142 is used on the combustion air inlet, it must
be installed with the arrow pointing up. It should be noted,
the combustion air will actually be moving in a direction
opposite of the arrow on the RF000142 coupling. It must
have a eld supplied, trapped drain tube free-draining to
proper condensate disposal location. A loop in the drain
tube can serve as a trap. The unused RF000142 drain tting
should be capped. A tee installed in the intake pipe is also an
acceptable method of catching condensation. It must have
a eld supplied, trapped drain tube or pipe, free-draining to
proper condensate disposal location. A loop in the drain tube
can serve as a trap.









17



single pipe installation

96”MAX3”M
ROOE
12” MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKE AND VENT
12” MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL

STRAIGHT
ELBOWS


90°
ELBOWS




TEE









90°

3”-24” BETWEEN PIPES
Alternate vent termination above anticipated




3” MIN
12” MIN TO GRADE OR HIGHEST
ANTICIPATED SNOW LEVEL
3”MIN
24”MAX
12” MIN SEPARATION



18


If more than one direct vent furnace is to be installed vertically
through a common roof top, maintain the same minimum
clearances between the exhaust vent and air intake termi-
nations of adjacent units as with the exhaust vent and air
intake terminations of a single unit.
If more than one direct vent furnace is to be installed horizon-
tally through a common side wall, maintain the clearances
as in the following gure. Always terminate all exhaust vent
outlets at the same elevation and always terminate all air
intakes at the same elevation.
3” MIN
12” MIN TO GRADE OR HIGHEST
ANTICIPATED SNOW LEVEL
12” MIN SEPARATION
3”MIN
24”MAX
Termination of


Refer to the directions provided with the Concentric Vent Kit
(CVENT) for installation specications.

This kit is to be used with 2” or 3” direct vent systems. The
vent kit must terminate outside the structure and may be in-
stalled with the intake and exhaust pipes located side-by-side
or with one pipe above the other. These kits are intended
for use with single pipe (non-direct vent) installations.



Vertical Installation
Horizontal Installation




A condensing gas furnace achieves its high level of e󰀩cien-
cy by extracting heat from the products of combustion to
the point where condensation takes place. The condensate
must be collected in the furnace drain trap and routed to
an appropriate drain location in compliance with local and
national codes.
Follow the bullets listed below when installing the drain
system. Refer to the following sections for specic details
concerning furnace drain trap installation and drain hose
hook ups.
• The drain trap supplied with the furnace must be
used.
• The drain trap must be primed at time of
installation.
• The drain line between furnace and drain location
must meet local and national codes.
• The drain line between furnace and drain location
must maintain a 1/4 inch per foot downward slope
toward the drain.
• Do not trap the drain line in any other location
than at the drain trap supplied with the furnace.
• If the drain line is routed through an area which
may see temperatures near or below freezing,
precautions must be taken to prevent condensate
from freezing within the drain line.
• If an air conditioning coil is installed with the
furnace, a common drain may be used. An open
tee must be installed in the drain line, to relieve
positive air pressure from the coil’s plenum. This
is necessary to prohibit any interference with the
function of the furnace’s drain trap.

All furnace models come with a factory installed drain trap.
For vertical installations, the trap will remain in the factory
position. All furnace models installed horizontally require
the trap to be relocated. Many drain hoses have a built–in
grommet which will provide a cabinet seal when installed. See
instructions below for your model and installation position.



19

Drain the furnace and air conditioning coil if applicable, in
compliance with code requirements. In horizontal installa-
tions, a eld installed rubber coupling will allow the drain trap
to be removed for cleaning. The drain trap must be primed
before initial furnace start up. When an air conditioning coil
drain is connected to the eld supplied furnace drain, it must
be vented with an open tee installed at a height no higher
than the bottom of the furnace collector box to prevent air
conditioning condensate from backing up into the furnace if
the common drain became blocked.
#3
#1 #2
#4 #5
#6
#7 #8
#9
#10
#11
100 Degree
Elbow
Coupling

NOTE: Hoses are model specic
and not all hoses will be shipped with all models.
E DGES OF SHEET METAL HOLES MAY BE SHARP . U SE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .

HIGH VOLTAGE !
T O AVOID THE RISK OF INJURY , ELECTRICAL SHOCK OR
DEATH , THE FURNACE MUST BE ELECTRICALLY
GROUNDED IN ACCORDANCE WITH LOCAL CODES OR IN
THEIR
ABSENCE , WITH
THE
LATEST EDITION
OF THE
N ATIONAL E LECTRIC C ODE .


TOAVOID THE RISK OF INJURY, ELECTRICAL SHOCK OR DEATH, THE
FURNACE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH
LOCAL CODES OR, IN THEIR ABSENCE, WITH THE LATEST EDITION OF THE
NATIONAL ELECTRICAL CODE.

The trap and factory installed hoses remain as shipped.
The furnace drain may exit either the right or left side of the
furnace cabinet. Both sides of the cabinet have two .875”
diameter holes which can be used interchangeably for drain
and low voltage wiring purposes. If a higher drain exit is need-
ed, a .875” diameter hole may be added in the area shown
in Figure 25. Any unused cabinet opening must be sealed.
Do not allow drain hose to sag or trap water.
Side Cut-Out
12”
3” Right side shown.
Acceptable
area for
drain hole.


1. Locate and Install the 45º pipe / hose drain coupling
from the outside of the cabinet (barbed end goes in the
cabinet) through hole in the right side of the cabinet
and secure with two eld supplied #8 self-tapping
screws (see Figure 26).
2. Locate the long drain hose #3 and cut at line “A”.
3. Install large end of hose #3 to trap outlet and secure
with 1.25” clamp.

20
4. Install smaller end of hose #3 on 45º elbow and secure
with 1” clamp.
5. Refer to Field Supplied Drain section for instructions
on eld supplied / installed drain on outlet of furnace
trap.
Installer selects right or left side drain
and installs this hose accordingly.
Hose #1
Hose #2
45 degree
barb-pipe
adapter
45 degree
barb-pipe
adapter


1. Install the 45 degree pipe / hose drain coupling from
the outside of the cabinet (barbed end goes in the
cabinet) through the hole in the left side of the cabinet
and secure with two eld supplied #8 self-tapping
screws (see Figure 26).
2. Locate the long drain hose #3 and cut at “B” line for a
17.5” cabinet; cut at line “C” for a 21” cabinet; do not
cut for a “D” width cabinet.
3. Install large end of hose #3 to trap outlet and secure
with 1.25” clamp.
4. Install smaller end of hose #3 on 45º elbow and secure
with 1” clamp.
5. Refer to Field Supplied Drain section for instructions
on eld supplied / installed drain on outlet of furnace
trap.


Minimum 5 ½” clearance is required for the drain trap
beneath the furnace.
1. Remove the clamps from both ends of the drain hoses.
2. Remove the two screws holding the drain trap to the
blower deck.
3. Remove the trap and two hoses from the blower deck
4. Remove the two plugs from the right side of the cabinet
and install them in the blower deck.
5. (Draining the Vent Elbow) Locate hose #2 (factory
installed) and cut 1” away from the 45 degree bend,
discard the 45 degree section. Insert hose #2 from
outside the cabinet through the cabinet drain hole
nearest the top. Secure it to the barbed tting in the
elbow with a red clamp.
6. For models DM96VE0303AN, DM96VE0403AN and
DM96VE0603AN; locate the hose #2 (factory installed)
and cut 1.5” length from the end of the hose. Insert
hose #2 from outside the cabinet through the cabinet
drain’s hole nearest to the top. Secure it to the barbed
tting in the elbow with a red clamp.
7. (Draining the Collector Box) Install the non-grommet
end of hose #11 from outside the cabinet in the bottom
drain hole. Install on collector box and secure with a
silver clamp.
8. Use two silver clamps and secure the hoses to drain
trap. The trap outlet faces the front of the furnace.
Secure the trap to the cabinet using two screws
removed in step 2 by inserting the two screws through
the large set of holes in the top mounting tabs of the
trap into the two predrilled holes in the side of the
cabinet.
9. Refer to Field Supplied Drain section for instructions on
eld supplied / installed drain on outlet of furnace trap.
Hose #11 Hose #2



Minimum 5 ½” clearance is required for the drain trap
beneath the furnace.
*Also see Front Cover Pressure Switch Tube Location on
page 11
1. Remove the clamps from the two drain tubes on the trap.
2. Remove the two screws holding the drain trap to the
blower deck.
3. Remove the trap and hoses from the blower deck .
4. Remove the two plugs from the left side of the cabinet
and install them in the blower deck.
5. (Draining the Vent Elbow) Locate hose #6. Measuring
from the non-grommet end; cut o󰀨 and discard 1 ½”
for a “D” width cabinet, 5” for a “C” width cabinet, 8 ½”
for a “B” width cabinet.