Maytag Amana MVM97 Series User manual

5151 San Felipe Suite 500
Houston, TX 77056
www.goodmanmfg.com • www.amana-hac.com
©2014-2018 Goodman Manufacturing Company, L.P.
I NSTALLATION I NSTRUCTIONS FOR
*MVM97 & *CVM97
M
ODULATING G AS F URNACE
IOG-2007G
02/2018
(Type FSP CATEGORY IV Direct
or Non Direct Vent Air Furnace)
These furnaces comply with requirements em-
bodied in the American National Standard / Na-
tional Standard of Canada ANSI Z21.47·CSA-2.3
Gas Fired Central Furnaces.
Installer:
Affix all manuals
adjacent to the unit.
As a professional installer you have an obligation to know
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 specific 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 conflict between existing practices
and the content of this manual, the precautions listed
here take precedence.
RECOGNIZE THIS SYMBOL
AS A SAFETY PRECAUTION.
*NOTE: Please contact your distributor or our website for
the applicable Specification Sheet referred to in this manual.
TABLE OF CONTENTS
is a registered trademark of Maytag Corporation or its related companies and is used under license. All rights reserved.
SAFETY CONSIDERATIONS ..................................... 4
SHIPPING INSPECTION ......................................... 5
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS .............. 5
TOTHE INSTALLER ........................................... 6
PRODUCT DESCRIPTION ....................................... 6
FEATURES ................................................... 6
PRODUCT APPLICATION ....................................... 7
LOCATION REQUIREMENTS & CONSIDERATINOS .................. 8
CLEARANCES AND ACCESSIBILITY ............................... 9
EXISTING FURNACE REMOVAL ................................ 10
THERMOSTAT LOCATION .................................... 10
COMBUSTION & VENTILATION AIR REQUIREMENTS ............ 10
INSTALLATION POSITIONS .................................... 14
HORIZONTAL APPLICATIONS & CONSIDERATIONS ............... 14
FURNACE SUSPENSION ....................................... 14
FRONT COVER PRESSURE SWITCH TUBE LOCATION ............ 14
DRAIN TRAP AND LINES ..................................... 14
LEVELING .................................................. 15
ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS .......... 15
DRAIN PAN ................................................ 15
FREEZE PROTECTION ........................................ 15
PROPANE GAS/HIGH ALTITUDE INSTALLATIONS ................. 15
VENT/FLUE PIPE & COMBUSTION AIR PIPE .................. 15
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT............ 16
MATERIALS AND JOINING METHODS ........................... 16
PROPER VENT/FLUE AND COMBUSTION AIR PIPING PRACTICES .16
TERMINATION LOCATIONS .................................... 17
SPECIAL VENTING REQUIREMENTS
FOR INSTALLATIONS INCANADA .......................... 17
STANDARD FURNACE CONNECTIONS .......................... 19
COMBUSTION AIR PIPE ..................................... 19
VENT/INTAKE TERMINATIONS
FOR INSTALLATION OF MULTIPLE DIRECT VENT FURNACES .. 22
CONCENTRIC VENT TERMINATION ............................ 23
SIDE WALL VENT KIT ...................................... 23
CONDENSATE DRAIN LINES & DRAIN TRAP ................... 23
GENERAL DRAIN INFORMATION .............................. 23
FIELD SUPPLIED DRAIN ..................................... 23

2
TABLE OF CONTENTS
HEATING OPERATION WITH CTK01 THERMOSTAT
(COMMUNICATING) ...................................... 40
HEATING OPERATION WITH CTK02**, CTK03** & CTK04**
THERMOSTAT (MODULATING COMMUNICATING) ................ 40
CONDENSATE DRAIN TRAP PRIMING .......................... 40
FURNACE OPERATION ....................................... 40
GAS SUPPLY PRESSURE MEASUREMENT ........................ 41
GAS MANIFOLD PRESSURE MEASUREMENT ..................... 42
GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY) ....... 43
TEMPERATURE RISE ......................................... 43
CIRCULATOR BLOWER SPEEDS ................................ 44
BLOWER HEAT OFF DELAY TIMINGS .......................... 45
COMFORTNET™ SYSTEM .................................... 45
OVERVIEW ................................................. 45
AIRFLOW CONSIDERATIONS ................................... 46
FOSSIL FUEL APPLICATIONS .................................. 46
CTK0* WIRING .......................................... 46
COMFORTNET™ SYSTEM ADVANCED FEATURES ................. 47
DIP SWITCHES ............................................. 48
NETWORK TROUBLESHOOTING ................................ 49
SYSTEM TROUBLESHOOTING .................................. 50
FAULT RECALL SEQUENCE ................................... 50
FAULT CLEAR SEQUENCE: ................................... 50
NORMAL SEQUENCE OF OPERATION ........................... 50
POWER UP................................................ 50
HEATING MODE ............................................ 50
COOLING MODE ............................................ 51
FAN ONLY MODE ........................................... 51
OPERATIONAL CHECKS ...................................... 51
SAFETY CIRCUIT DESCRIPTION ............................... 51
FURNACE CONTROL BOARD .................................. 52
PRIMARY LIMIT ............................................. 52
AUXILIARY LIMIT ........................................... 52
ROLLOUT LIMIT ............................................ 52
FAN ONLY MODE ........................................... 52
OPERATIONAL CHECKS ...................................... 52
SAFETY CIRCUIT DESCRIPTION ............................... 52
FURNACE CONTROL BOARD .................................. 52
PRIMARY LIMIT ............................................. 52
AUXILIARY LIMIT ........................................... 52
ROLLOUT LIMIT ............................................ 53
PRESSURE SWITCHES ........................................ 53
T HE MANUFACTURER WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES . I F
YOU INSTALL OR PERFORM SERVICE ON THIS UNIT , YOU ASSUME RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE WHICH MAY RESULT .
M
ANY JURISDICTIONS REQUIRE A LICENSE TO INSTALL OR SERVICE HEATING AND AIR CONDITIONING EQUIPMENT .
WARNING
UPFLOW MODEL INSTALLED VERTICALLY ....................... 24
DRAIN EXITING RIGHT SIDE ................................. 24
DRAIN EXITING LEFT SIDE .................................. 24
UPFLOW MODEL INSTALLED HORIZONTALLY
WITH RIGHT SIDE DOWN ................................. 25
UPFLOW MODEL INSTALLED HORIZONTALLY
WITH LEFT SIDE DOWN .................................. 25
UPFLOW MODEL INSTALLED HORIZONTALLY
WITH LEFT SIDE DOWN - ALTERNATE ..................... 26
COUNTERFLOW MODEL INSTALLED VERTICALLY ................. 26
DRAIN EXITING LEFT SIDE .................................. 26
DRAIN EXITING RIGHT SIDE ................................. 27
COUNTERFLOW MODEL INSTALLED HORIZONTALLY
WITH RIGHT SIDE DOWN ................................ 27
COUNTERFLOW MODEL INSTALLED HORIZONTALLY
WITH LEFT SIDE DOWN .................................. 28
ELECTRICAL CONNECTIONS ................................... 28
WIRING HARNESS .......................................... 28
115 VOLT LINE CONNECTIONS .............................. 28
JUNCTION BOX RELOCATION ................................. 29
24 VOLT THERMOSTAT WIRING ............................. 29
SINGLE-STAGE HEATING THERMOSTAT APPLICATION ............ 30
24 VOLT DEHUMIDISTAT WIRING ............................ 30
FOSSIL FUEL APPLICATIONS .................................. 31
LINE VOLTAGE ACCESSORIES
(ELECTRONIC AIR CLEANER AND HUMIDIFIER).............. 31
24 VOLT HUMIDIFIER ...................................... 31
GAS SUPPLY AND PIPING .................................... 31
HIGH ALTITUDE DERATE ..................................... 32
PROPANE GAS CONVERSION ................................. 32
GAS PIPING CONNECTIONS .................................. 33
PROPANE GAS TANKS AND PIPING ............................ 35
CIRCULATING AIR & FILTERS ................................ 36
DUCT WORK - AIR FLOW ................................... 36
CHECKING DUCT STATIC ..................................... 36
BOTTOM RETURN AIR OPENING [UPFLOW MODELS] ........... 36
FILTERS - READ THIS SECTION
BEFORE INSTALLING THE RETURN AIR DUCT WORK .......... 37
UPRIGHT INSTALLATIONS ..................................... 38
HORIZONTAL INSTALLATIONS ................................. 39
STARTUP PROCEDURE & ADJUSTMENT ........................ 39

3
TABLE OF CONTENTS
FLAME SENSOR ............................................. 53
TROUBLESHOOTING ......................................... 53
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS .............. 53
DIAGNOSTIC CHART ........................................ 53
RESETTING FROM LOCKOUT ................................. 53
MAINTENANCE .............................................. 54
ANNUAL INSPECTION ........................................ 54
FILTERS ................................................... 54
BURNERS .................................................. 54
INDUCED DRAFT AND CIRCULATOR BLOWERS ................... 54
CONDENSATE TRAP AND DRAIN SYSTEM
(QUALIFIED SERVICER ONLY) ............................. 54
FLAME SENSOR (QUALIFIED SERVICER ONLY) ................. 55
BEFORE LEAVING AN INSTALLATION ............................ 55
REPAIR AND REPLACEMENT PARTS ............................ 55
TROUBLESHOOTING CODES ............................... 56-60
STATUS CODES ............................................. 61
WIRING DIAGRAM .......................................... 62
SPECIAL INSTRUCTIONS FOR PRODUCTS INSTALLED
IN THE STATE OF MASSACHUSETTS ........................ 63

4
SAFETY CONSIDERATIONS
Adhere to the following warnings and cautions when install-
ing, adjusting, altering, servicing, or operating the furnace.
To ensure proper installation and operation, thoroughly read
this manual for specifics pertaining to the installation and
application of this product.
This furnace is manufactured for use with natural gas. It
may be field converted to operate on L.P. gas by using the
appropriate L.P. conversion kit listed in the PROPANE GAS/
HIGHALTITUDE INSTALLATIONS section of this manual
Install this furnace only in a location and position as speci-
fied in LOCATION REQUIREMENTS & CONSIDERATIONS sec-
tion and INSTALLATION POSITIONS section of this manual.
Provide adequate combustion and ventilation air to the fur-
nace as specified in COMBUSTION & VENTILATION AIR RE-
QUIREMENTS section of this manual.
Combustion products must be discharged to the outdoors.
Connect this furnace to an approved vent system only, as
specified in VENT/FLUE PIPE & COMBUSTIONAIR PIPE sec-
tion of this manual.
Never test for gas leaks with an open flame. Use a commer-
cially available soap solution made specifically for the detec-
tion of leaks to check all connections, as specified in GAS
SUPPLY AND PIPING section of this manual.
Always install a furnace to operate within the furnace’s in-
tended temperature-rise range with a duct system which has
external static pressure within the allowable range, as speci-
fied on the furnace rating plate and OPERATIONALCHECKS
section of these instructions.
When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space contain-
ing 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.
A gas-fired furnace for installation in a residential garage
must be installed as specified in the LOCATION REQUIRE-
MENTSAND CONSIDERATIONS section of this manual.
This furnace may be used as a construction site heater only
if certain conditions are met. These conditions are listed in
the PRODUCTAPPLICATION section of this manual.
FROZEN ANDBURST WATER PIPE HAZARD
F
AILURE TO PROTECT AGAINST THE RISK OF FREEZING MAY RESULT IN
PROPERTY DAMAGE .
S
PECIAL PRECAUTIONS MUST BE MADE IF INSTALLING FURNACE IN AN
AREA WHICH MAY DROP BELOW FREEZING . T HIS CAN CAUSE IMPROPER
OPERATION OR DAMAGE TO EQUIPMENT . I F THE FURNACE
ENVIRONMENT HAS THE POTENTIAL OF FREEZING , THE DRAIN TRAP AND
DRAIN LINE MUST BE PROTECTED . T HE USE OF ACCESSORY DRAIN TRAP
HEATERS , ELECTRIC HEAT TAPE AND / OR RV ANTIFREEZE IS
RECOMMENDED FOR THESE INSTALLATIONS .
CAUTION
T O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER
INSTALLATION , ADJUSTMENT , ALTERATION , SERVICE OR MAINTENANCE ,
REFER TO THIS MANUAL . F OR ADDITIONAL ASSISTANCE OR
INFORMATION , CONSULT A QUALIFIED INSTALLER , SERVICER AGENCY OR
THE GAS SUPPLIER .
WARNING
I F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED
EXACTLY , A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY
DAMAGE
, PERSONAL INJURY OR LOSS OF LIFE .
D O NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE .
D
O NOT TRY TO LIGHT ANY APPLIANCE .
D
O NOT TOUCH ANY ELECTRICAL SWITCH ; DO NOT USE ANY PHONE
IN YOUR BUILDING .
I
MMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR ’ S
PHONE . F OLLOW THE GAS SUPPLIER ’ S INSTRUCTIONS .
I
F YOU CANNOT REACH YOUR GAS SUPPLIER , CALL THE FIRE
DEPARTMENT .
I
NSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED
INSTALLER , SERVICE AGENCY OR THE GAS SUPPLIER .
WHAT TO DO IF YOU SMELL GAS:




WARNING
T HIS PRODUCT CONTAINS OR PRODUCES A CHEMICAL OR CHEMICALS
WHICH MAY CAUSE SERIOUS ILLNESS OR DEATH AND WHICH ARE
KNOWN TO THE S TATE OF C ALIFORNIA TO CAUSE CANCER , BIRTH
DEFECTS OR OTHER REPRODUCTIVE HARM .
WARNING
H EATING UNIT SHOULD NOT BE UTILIZED WITHOUT REASONABLE ,
ROUTINE , INSPECTION , MAINTENANCE AND SUPERVISION . I F THE
BUILDING IN WHICH ANY SUCH DEVICE IS LOCATED WILL BE VACANT ,
CARE SHOULD BE TAKEN THAT SUCH DEVICE IS ROUTINELY INSPECTED ,
MAINTAINED AND MONITORED . IN THE EVENT THAT THE BUILDING
MAYBE EXPOSED TO FREEZING TEMPERATURES AND WILL BE VACANT ,
ALL WATER - BEARING PIPES SHOULD BE DRAINED , THE BUILDING SHOULD
BE PROPERLY WINTERIZED , AND THE WATER SOURCE CLOSED . IN THE
EVENT THAT THE BUILDING MAY BE EXPOSED TO FREEZING
TEMPERATURES AND WILL BE VACANT , ANY HYDRONIC COIL UNITS
SHOULD BE DRAINED AS WELL AND , IN SUCH CASE , ALTERNATIVE HEAT
SOURCES SHOULD BE UTILIZED .
WARNING
T O PREVENT POSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR
DEATH DUE TO ELECTRICAL SHOCK , THE FURNACE MUST BE LOCATED TO
PROTECT THE ELECTRICAL COMPONENTS FROM WATER .
WARNING
Drain trap must be primed at time of installation. Trap is
internally partitioned; add water to both inlet ports until wa-
ter appears at both sides of the outlet opening. Failure to
prime trap at time of installation may have a negative ef-
fect on combustion quality and pressure switch action.

5
P OSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , EXPLOSION , SMOKE , SOOT , CONDENSATION , ELECTRICAL SHOCK
OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION ,
REPAIR OPERATION , OR MAINTENANCE OF THIS PRODUCT .
WARNING
S HOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF ,
TURN OFF THE MANUAL GAS SHUTOFF VALVE EXTERNAL TO THE
FURNACE BEFORE TURNING OFF THE ELECTRICAL SUPPLY .
WARNING
SHIPPINGINSPECTION
All units are securely packed in shipping containers tested
according to International Safe Transit Association specifica-
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 dam-
age and bolts or screws which may have come loose in tran-
sit. 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 notified
as soon as possible - preferably within five days.
4. File the claim with the following support documents
within a nine month statute of limitations.
• Original or certified copy of the Bill of Lading, or
indemnity bond.
• Original paid freight bill or indemnity in lieu thereof.
B10259-216
CO can cause serious illness including permanent brain
damageor 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 causerdes maladies gravestelles 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.
• Original or certified copy of the invoice, showing trade
and other discounts or reductions.
• Copy of the inspection report issued by carrier’s
representative at the time damage is reported to
carrier.
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 deal-
ers for transportation damage.
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
NOTE: Discharge your body’s static electricity before touch-
ing unit. An electrostatic discharge can adversely affect elec-
trical components.
Use the following precautions during furnace installation and
servicing to protect the integrated control module from dam-
age. 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 dis-
charge. 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.

6
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 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.
TOTHE INSTALLER
Before installing this unit, please read this manual thoroughly
to familiarize yourself with specific 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 .
WARNING
P RODUCT D ESCRIPTION
FEATURES
This furnace is a part of the ComfortNet™ family of products.
The CTK family of thermostat kits allow this furnace to be
installed as part of a digitally communicating system. The
ComfortNet system provides advanced airflow configuration,
enhanced setup features, and enhanced diagnostics. It also
reduces the number of thermostat wires to a maximum of
four. It may be also installed as part of a non-communicating
system using a standard 24 VAC thermostat.
This product may be installed with the ComfortNet thermo-
stat and a non-ComfortNet compatible single stage air condi-
tioning unit. However, this reduces the benefits of the
ComfortNet system as the enhancements will only apply to
the furnace.
The modulating furnace operation is based off of nega-
tive pressure created by the draft inducer. The furnace
control board receives commands from the room ther-
mostat. The furnace control board then controls the RPM
of the (3 phase) inducer by varying the frequency and
voltage to the inducer. This is known as variable fre-
quency drive (VFD). The inducer, pressure switches, and
gas valve are linked by pneumatic tubing. The gas valve
modulates based on this negative pressure.
5
9
4
3
12
16
28
32
11
14 15
3017
18
2
19
21 27
24
25
20
23
26
20
2213
30
29
31
16
77
888
Both Sides
10
UPFLOW / HORIZONTAL MODEL
Figure 1
2
5
6
9
10
11
3
12
13
16 18
19
20
23
25
26
27
21
20
31
32
77
88 88 88 4
2
17
15
1
COUNTERFLOW/HORIZONTAL
Figure 2

7
This product is 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 these instructions.
• All other warranty exclusions and restrictions apply
This furnace is an ETL dual-certified appliance and is
appropriate for use with natural or propane gas
(NOTE: If using propane, a propane conversion kit is
required).
Gas furnaces manufactured on or after May 1, 2017 are not
permitted to be used in Canada for heating of buildings or
structures under construction.
In the U.S.A. this furnace may be used as a construction site
heater ONLY if 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 affected by vibration must not be used
during construction.
• Return air ducts are provided and sealed to the
furnace.
• A return air temperature range between 60ºF
(16ºC) and 80ºF (27ºC) is maintained.
• Air filters are installed in the system and
replaced daily 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 filters and evaporator coils are
thoroughly cleaned following final construction
clean up by a qualified person.
• All furnace operating conditions (including
ignition, input rate, temperature rise and
venting) are verified by a qualified 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 is not covered under the
warranty.
1 Gas Valve
2 Gas Line Entrance (Alternate)
3 Pressure Switch(es)
4 Gas Manifold
5 Combustion Air Intake Connection
6 Hot Surface Igniter
7 Rollout Limit
8 Burners
9 Flame Sensor
10 Flue Sensor
11 Flue Pipe
12 Primary Limit
13 Gas Line Entrance
14 Flue Pipe Connection (Alternate) NK
15 Rubber Elbow
16 Variable-Speed Induced Draft Blower
17 Electrical Connection Inlets (Alternate)
18 Coil Front Cover Pressure Tap
19 Coil Font Cover Drain Port
20 Drian Line Penetrations
21 Drain Trap
22 Blower Door Interlock Switch
23 Inductor (Not All Models)
24 Integrated Control Module
25 24 Volt Thermostat Connections
26 Transformer (40 VA)
27 ECM Variable Speed Circulator Blower
28 Auxiliary Limit
29 Junction Box
30 Electrical Connection Inlets
31 Coil Front Cover
32 “H” Fitting
P RODUCT A PPLICATION
This furnace is primarily designed for residential home-heat-
ing applications. It is NOT designed or certified for use in
mobile homes, trailers or recreational vehicles. Neither is it
designed or certified for outdoor applications. The furnace
must be 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 com-
mercial 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
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.
• It must not be used as a “make-up” air unit.

8
NOTE: 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 fitter.
• 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
flooring.
To ensure proper furnace operation, install, operate and
maintain the furnace in accordance with these instal-
lation and operation instructions, all local building codes
and ordinances. In their absence, follow the latest edi-
tion 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:
American National Standards Institute
25 West 43rd Street, 4th Floor
New York, NY 10036
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02169-7471
CSA International
8501 East Pleasant Valley
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 Contractors of
America.
A copy of the CAN/CSA B149.1-15 Installation Codes can
also be obtained from:
CSA International
178 Rexdale Boulevard
Etobicoke, Ontario, Canada M9W 1R3
L OCATION R EQUIREMENTS & C ONSIDERATINOS
Follow the instructions listed below and the guidelines
provided inthe CombustionandVentilationAirRequirements
section when selecting a furnace location.
T O PREVENT POSSIBLE EQUIPMENT DAMAGE , PROPERTY DAMAGE ,
PERSONAL INJURY OR DEATH , THE FOLLOWING BULLET POINTS MUST BE
OBSERVED WHEN INSTALLING THIS UNIT .
WARNING
P OSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH DUE TO
FIRE , EXPLOSION , SMOKE , SOOT , CONDENSATION , ELECTRICAL SHOCK
OR CARBON MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION ,
REPAIR OPERATION , OR MAINTENANCE OF THIS PRODUCT .
WARNING
• Centrally 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/flue 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. NOTE:
The length of flue and/or combustion air piping
can be a limiting factor in the location of the
furnace.
• Locate the furnace so condensate flows
downwards to the drain. Do not locate the
furnace or its condensate drainage system in any
area subject to below freezing temperatures
without proper freeze protection. Refer to
Condensate Drain Lines and Trap for further
details.
• Ensure adequate combustion air is available for
the furnace. Improper or insufficient combustion
air can expose building occupants to gas
combustion products that could include carbon
monoxide. Refer to Combustion and Ventilation
Air Requirements.
• Set the furnace on a level floor to enable proper
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 Applications and Considerations
for leveling of horizontal furnaces.
• Ensure upflow or horizontal furnaces are not
installed directly on carpeting, or any other
combustible material. The only combustible
material allowed is wood.
• A special accessory subbase must be used for
upright counterflow unit installations over any
combustible material (including wood). Refer to
subbase instructions for installation details.
(NOTE: A subbase will not be required if an air
conditioning coil is located beneath the furnace
between the supply air opening and the combustible
floor.
• Exposure to contaminated combustion air will
result in safety and performance-related

9
problems. Do not install the furnace where the
combustion air is exposed to the following
substances:
permanent wave solutions
chlorinated waxes or cleaners
chlorine-based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
carbon tetrachloride
halogen type refrigerants
cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
masonry acid washing materials
• Isolate a non-direct furnace from an area
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, air must be
ducted in 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
unit, install the furnace upstream or in parallel
with the cooling coil. Premature heat exchanger
failure will result if the cooling coil is placed
upstream of the furnace.
For vertical (upflow or downflow) applications,
the minimum cooling coil width shall not be less
than furnace width minus 1”. Additionally, a
coil installed above an upflow furnace or under
a counterflow furnace may be the same width
as the furnace or may be one size larger than
the furnace. Example: a “C” width coil may be
installed with a “B” width furnace.
For upflow applications, the front of the coil
and furnace must face the same direction.
• 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, ensure
the access doors are not on the “up/top” or
“down/bottom” side of the furnace.
• Do not connect this furnace to a chimney flue
that serves a separate appliance designed to
burn solid fuel.
• On Counterflow Installations, the air
conditioning coil must be downstream on the
supply (positive) side of the furnace heat
exchanger.
•Counterflow Installation over a noncombustible
floor. Before setting the furnace over the plenum
opening, ensure the surface around the opening
is smooth and level. A tight seal should be made
between the furnace base and floor by using a
silicone rubber caulking compound or cement
grout.
•CounterflowInstallation overa combustible floor.
If installation over a combustible floor becomes
necessary, use an accessory subbase (see
Specification Sheet applicable for your model for
details.) A special accessory subbase must be used
for upright counterflow unit installations over any
combustible material including wood. Refer to
subbase instructions for installation details. Follow
the instructions with the subbase for proper
installation. Do not install the furnace directly on
carpeting, tile, or other combustible material
other than wood flooring. (NOTE: The subbase will
not be required if an air conditioning coil is installed
between the supply air opening on the furnace and
the floor.)
CLEARANCES AND ACCESSIBILITY
POSITION* FRONT SIDES REAR TOP FLUE FLOOR
Upflow 3" 0" 0" 1" 0" C
Horizontal Alc ove 6" 0" 4" 0" C
C = If placed on combustible floor, floor MUST be wood only.
*MVM97* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
NOTES:
• For servicing or cleaning, a 24” front clearance is required.
• Unit connections (electrical, flue and drain) may necessitate
greater clearances than the minimum clearances listed above.
• In all cases, accessibility clearance must take precedence over
clearances from the enclosure where accessibility clearances are
greater.
POSITION* SIDES REAR FRONT BOTTOM FLUE TOP
Counterflow 0" 0" 3" NC 0" 1"
Horizontal 6" 0" 3" C 0" 6"
C = If placed on combustible floor, floor MUST be wood only.
NC = For installation on non-combustible floors only. A combustible subbase
must be used for installations on combustible flooring.
*CVM97* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
(INCHES)
NOTES:
• For servicing or cleaning, a 24” front clearance is required.
• Unit connections (electrical, flue and drain) may necessitate
greater clearances than the minimum clearances listed above.
• In all cases, accessibility clearance must take precedence over
clearances from the enclosure where accessibility clearances are
greater.

10
Installations must adhere to the clearances to combustible ma-
terials 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 perma-
nently maintained. Clearances must also accommodate an
installation’s gas, electrical, and drain trap and drain line con-
nections.
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.
TOP
BOTTOM
SIDE SIDE SIDE
TOP
BOTTOM
Upflow Counterflow Horizontal
Figure 3
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 Z21.4, CSA-
2.3 latest edition Section 1.23.1.
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while
any other appliances connected to the venting system are
not in operation:
1. Seal any unused openings in the venting system;
2. Inspect the venting system for proper size and hori-
zontal pitch, as required by the National Fuel Gas Code,
ANSI Z223.1 or the Natural Gas and Propane Installa-
tion Code, CSA B149.1-15 and these instructions. De-
termine that there is no blockage or restriction, leak-
age, corrosion and other deficiencies which could cause
an unsafe condition.
3. As far as practical, close all building doors and win-
dows and all doors between the space in which the
appliance(s) connected to the venting system are lo-
cated and other spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected
to the venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they shall
operate at maximum speed. Do not operate a summer
exhaust fan.
6. Follow the lighting instructions. Place the appliance be-
ing inspected in operation. Adjust thermostat so appli-
ance shall operate continuously.
7. Test for spillage from draft hood appliances at the draft
hood relief opening after 5 minutes of main burner op-
eration. Use the flame of a match or candle.
8. If improper venting is observed during any of the above
tests, the venting system must be corrected in accor-
dance with the National Fuel Gas Code ANSI Z223.1/
NFPA 54 and/or National Gas and Propane Installation
Code CSA B149.1-15.
9. After it has been determined that each appliance con-
nected to the venting system properly vents when
tested as outlined above, return doors, windows, ex-
haust fans, fireplace dampers and any other gas burn-
ing 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 edition
of the National Fuel Gas Code ANSI Z223.1 and/or
CSA B149.1-15 Installation Codes.
THERMOSTAT LOCATION
The thermostat should be placed approximately five feet
from the floor on a vibration-free, inside wall in an area
having good air circulation. Do not install the thermostat
where it may be influenced by any of the following:
• Drafts, or dead spots behind doors, in corners, or
under cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
• Light fixtures or other appliances.
• Radiant heat from a fireplace.
• 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.
C OMBUSTION & V ENTILATION A IR R EQUIREMENTS
T O AVOID PROPERTY DAMAGE , PERSONAL INJURY OR DEATH ,
SUFFICIENT FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF
FLUE GASES MUST BE SUPPLIED . M OST HOMES REQUIRE OUTSIDE AIR BE
SUPPLIED INTO THE FURNACE AREA .
WARNING
Improved construction and additional insulation in buildings
have reduced heat loss by reducing air infiltration and es-
cape around doors and windows. These changes have helped
in reducing heating/cooling costs but have created a prob-
lem supplying combustion and ventilation air for gas fired
and other fuel burning appliances. Appliances that pull air

11
)
(
)(
out of the house (clothes dryers, exhaust fans, fireplaces, etc.)
increase the problem by starving appliances of air.
House depressurization can cause back drafting or improper
combustion of gas-fired appliances, thereby exposing build-
ing occupants to gas combustion products that could include
carbon monoxide.
When the furnace is installed as a direct vent (2-pipe sys-
tem) furnace, no special provisions for air for combustion
are required. However, 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 appli-
cable 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 fur-
nace area by means of ventilation grilles or ducts connect-
ing directly to the outdoors or spaces open to the outdoors
such as attics or crawl spaces.
The following information on air for combustion and ventilation
is reproduced from the National Fuel Gas Code NFPA54/ANSI
Z223.1 Section 9.3.
9.3* Air for Combustion and Ventilation.
9.3.1 General.
9.3.1.1 Airforcombustion,ventilation,and dilution of flue gases for appli-
ances 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 appli-
ances.
9.3.1.2 Appliances of other than natural draft design and other than Cat-
egory 1 vented appliances shall be provided with combustion, ventilation,
and dilution air in accordance with the appliance manufacturer’s instruc-
tions.
9.3.1.3Appliances shall be located so as not to interfere with proper circu-
lationof combustion,ventilation,and dilutionair.
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
combustionairsupply.
9.3.1.5Makeup 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 require-
ments.
9.3.2IndoorCombustionAir. 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
wheretheairinfiltration rate is known to belessthan0.40 ACH, the method
in 9.3.2.2 shall be used. The total required volume shall be the sum of the
requiredvolume calculatedforallapplianceslocated withinthe space.Rooms
communicatingdirectlywiththe space in which the appliancesareinstalled
throughopenings notfurnishedwith doors,andthroughcombustionair open-
ings sized and located in accordance with 9.3.2.3, are considered a part of
therequiredvolume.
9.3.2.1* Standard Method. The minimum required volume shall be 50 ft
3per 1,000/Btu/hour (4.8m3/kW).
9.3.2.2*KnownAirInfiltrationRateMethod.Where the air infiltration
rate of a structure is known, the minimum required volume shall be deter-
minedasfollows:
(1) For appliances other than fan-assisted, calculate using the following
equation: 21 ft3I other
Required Volume other > ________ _________
ACH 1000Btu/hr
(2) Forfan-assisted appliances, calculate usingthefollowingequation:
15 ft3I fan
Required Volume fan > ________ _________
ACH 1000Btu/hr
where:
I other = all appliances other than fan-assisted input in Btu per hour
I fan = fan-assisted appliances input in Btu per hour
ACH = air change per hour (percent of volume of space exchanged
per hour, expressed as a decimal)
(3) For purposes of this calculation, an infiltration rate greater than 0.60
ACH shall not be used in the equations in 9.3.2.2(1) and 9.3.2.2(2).
9.3.2.3 Indoor Opening Size and Location. Openings used to 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 mini-
mum free area of 1 in.2/1000Btu/hr (2200 mm2/kW) of the total input
rating of all appliances in the space but not less than 100 in.2(0.60m2).
Oneopeningshall commencewithin12 in.(300mm) of thetop,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).
Figure A.9.2.3.3.(1) All Combustion Air from Adjacent
Indoor Spaces through Indoor Combustion Air Openings.

12
(2) Combining spaces in different stories.The volumes of spaces in dif-
ferentstoriesshallbeconsidered as communicating spaces where such
spacesareconnectedby one or moreopeningsin doors or floors having
atotalminimumfree area of 2 in.2/1000Btu/hr(4400mm2/kW) oftotal
inputratingofall appliances.
9.3.3 Outdoor Combustion Air. Outdoor combustion air shall be pro-
vided 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).
9.3.3.1 Two Permanent Openings Method. Two permanent openings,
one commencing within 12 in. (300 mm) of the top and one commencing
within12in. (300mm)of the bottom,ofthe enclosureshallbe provided. The
openingsshallcommunicate directly, orbyducts, withtheoutdoors orspaces
thatfreelycommunicatewiththeoutdoors, as follows:
(1)*Where directly communicating with the outdoors or where communi-
catingtotheoutdoorsthrough vertical ducts, each opening shall have a
minimum free area of 1 in.2/4000 Btu/hr (550 min2/kW) of total input
rating of all appliances in the enclosure. [See Figure A.9.3.3.1(1)(a)
and Figure A.9.3.3.1(1)(b).]
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.
Figure A.9.3.3.1(1)(b) All Combustion Air
From Outdoors through Ventilated Attic.
(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).]
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 openings,
commencing within 12 in. (300 mm) of the top of the enclosure, shall be
provided.Theapplianceshall have clearances of at least1in.(25 mm) from
the sides and back and 6 in. (150 mm) from the front of the appliance. The
openingshalldirectly communicate with theoutdoorsor 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
minimumfreeareaof the following:
(1) 1 in.2/3000 Btu/hr (700 mm2per kW) of the total input rating of all
appliances located in the enclosure, and
(2) Not less than the sum of the areas of all vent connectors in the space.

13
Figure A.9.3.3.2 All Combustion Air
From Outdoors through Single Combustion Air Opening.
9.3.4 Combination Indoor and OutdoorCombustionAir. The use of a
combination of indoor and outdoor combustion air shall be in accordance
with (1) through (3) (see example calculation in Annex J]:
(1) Indoor Openings: Whereused, openings connecting the interiorspaces
shallcomplywith 9.3.2.3.
(2) Outdoor Opening(s) Location. Outdoor opening(s) shall be located in
accordance with 9.3.3.
(3) Outdoor Opening(s) Size. The outdoor opening(s) size shall be calcu-
latedinaccordancewith the following:
(a) The ratiooftheinterior spaces shall betheavailable volume of all
communicatingspacesdividedby the required volume.
(b) The outdoor size reduction factor shall be 1 minus the ratio of
interior spaces.
(c) The minimum size of outdoor opening(s) shall be the full size of
outdooropening(s) calculatedinaccordance with9.3.3,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
shallprovidean adequate supply ofcombustion,ventilation, and dilution air
andshallbeapproved by the authorityhavingjurisdiction.
9.3.6 Mechanical CombustionAir Supply. Where all combustion air is
provided by a mechanical air supply system, the combustion air shall be
suppliedformoutdoorsatthe minimum rate of 0.35 ft3/minper1000Btu/hr
(0.034 m3/min per kW) for all appliances located within the space.
9.3.6.1Where 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 mechani-
cal air supply system to prevent main burner operation where the mechani-
cal air supply system is not in operation.
9.3.6.3Wherecombustion air is providedbythebuilding’s mechanicalven-
tilationsystem,thesystem shall provide the specifiedcombustionairrate in
additiontothe required ventilation air.
9.3.7 Louvers, Grilles, and Screens.
9.3.7.1 Louvers and Grilles. The required size of openings for combus-
tion, 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
isknown,itshall be used in calculating the sizeopeningrequiredto 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.
Nonmotorizedlouversandgrilles shall be fixedinthe open position.
9.3.7.2 Minimum Screen Mesh Size. Screens shall not be smaller than
1/4 in. mesh.
9.3.7.3 Motorized Louvers. Motorized louvers shall be interlocked with
theapplianceso theyareproven in thefullopen positionpriorto main burner
ignition and during main burner operation. Means shall be provided to pre-
ventthe mainburner formignitingshouldthelouverfailtoopenduring 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
9.3.8.1through9.3.8.8.
9.3.8.1 Ducts shall be constructed of galvanized steel or a material having
equivalentcorrosionresistance,strength, and rigidity.
Exception: Within dwellings units, unobstructed stud and joist spaces shall
not be prohibited from conveying combustion air, provided that not more
than one fireblock is removed.
9.3.8.2Ductsshallterminate in an unobstructed space, allowingfreemove-
ment of combustion air to the appliances.
9.3.8.3 Ducts shall serve a single space.
9.3.8.4Ductsshallnot serve both upper and lower combustion airopenings
where both such openings are used. The separation between ducts servic-
ingupper andlower combustionair openingsshallbemaintainedtothesource
ofcombustionair.
9.3.8.5 Ducts shall not be screened where terminating in an attic space.
9.3.8.6 Horizontal upper combustion air ducts shall not slope downward
toward the source of combustion air.
9.3.8.7The remaining space surrounding a chimney liner, gas vent, special
gasvent,orplasticpiping installed within a masonry, metal, or factory built
chimneyshallnotbeused 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.

14
I NSTALLATION P OSITIONS
*MVM97 models may be installed upflow or horizontally with
left or right side down. *CVM97 models may be installed
downflow or horizontally with left or right side down.
Do not install this furnace on its back. For upright upflow
furnaces, return air ductwork may be attached to the side
panel(s) and/or basepan. For horizontal upflow furnaces,
return air ductwork must be attached to the basepan. For
both uprightor horizontal counterflowfurnaces, return duct-
work must be attached to the basepan (top end of the blower
compartment). NOTE: Ductwork must never be attached to
the back of the furnace. Refer to “Recommended Installa-
tion Positions” figure for appropriate installation positions,
ductwork connections, and resulting airflow arrangements.
Figure 4A
Figure 4B
Figure 4C
Recommended Installation Positions
H ORIZONTAL A PPLICATIONS & C ONSIDERATIONS
When installing a furnace horizontally, additional consider-
ation must be given to the following:
FURNACE SUSPENSION
If suspending the furnace from rafters or joists, use 3/8"
threaded rod and 2”x2”x1/8” angle iron as shown in the fol-
lowing diagram. The length of rod will depend on the applica-
tion and the clearances necessary.
If the furnace is installed in a crawl space it must be sus-
pended from the floor joist or supported by a concrete pad.
Never install the furnace on the ground or allow it to be ex-
posed to water.
2" 2" 3/8" ANGLE IRON
(3 PLACES )
XX
Figure 5
FRONT COVER PRESSURE SWITCH TUBE LOCATION
When a furnace is installed horizontally with left side down,
the front cover pressure switch tube must be re-located
to the lower port of the collector box cover.
1. Remove tube from front cover pressure switch and
collector box cover.
2. Remove rubber plug from bottom collector box port
and install on top collector box port.
3. Locate 24” x 1/4” tube in bag assembly.
4. Install one end on front cover pressure switch.
5. Route tube to lower port on collector box cover and
cut off excess tubing.
DRAIN TRAP AND LINES
In horizontal applications the condensate drain trap is se-
cured to the furnace side panel, suspending it below the fur-
nace. A minimum clearance of 5 1/2 inches below the fur-
nace 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 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.

15
LEVELING
Leveling ensures proper condensate drainage from the heat
exchanger. For proper flue pipe drainage, the furnace must
be level lengthwise from end to end. The furnace should
have a slight tilt from back to front with the access doors
downhill from the back panel approximately 1/2 to 3/4
inches. The slight tilt allows the heat exchanger condensate,
generated in the recuperator coil, to flow forward to the
recuperator coil front cover.
ALTERNATE ELECTRICAL AND GAS LINE CONNECTIONS
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 “bot-
tom” of the furnace.
DRAIN PAN
A drain pan must be provided if the furnace is installed above
a conditioned area. The drain pan must cover the entire area
under the furnace (and air conditioning coil if applicable).
FREEZE PROTECTION
Refer to Horizontal Applications and Conditions - Drain Trap
and Lines.
P ROPANE G AS /H IGH A LTITUDE I NSTALLATIONS
WARNING
P OSSIBLE PROPERTY DAMAGE , PERSONAL INJURY OR DEATH MAY
OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED . T HE
APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER
FURNACE OPERATION . A LL CONVERSIONS MUST BE PERFORMED BY A
QUALIFIED INSTALLER OR SERVICE AGENCY .
This furnace is shipped from the factory configured for natural
gas up to 10,000 ft. altitude. Propane conversions require
the proper LP kit to compensate for the energy content dif-
ference between natural and propane gas.
High
Stage
Low Stage
(50% firing
rate)
Natural None #4513.5" w.c. 1" w.c. None
Propane LPM-09 1.25MM210.0" w.c. 2.6" w.c. None
OrificeGas
0-10,000
Manifold Pressure Pressure
Switch
Change
Altitude Kit
NOTE: In Canada,gas furnaces are onlycertified to 4500 feet.
For furnaces being converted to LP gas, it is strongly recom-
mended that a LPLP03 kit also be installed. The use of this
kit will prevent the furnace from firing when the LP gas sup-
ply pressure is too low to support proper combustion.
The indicated kit must be used to ensure safe and proper fur-
nace operation. All conversions must be performed by a quali-
fied installer, or service agency.
V ENT /F LUE P IPE & C OMBUSTION A IR P IPE
This manual will refer to the pipe that discharges products
of combustion to the outdoors as the “vent” pipe or “flue”
pipe. The pipe that supplies air for combustion to the fur-
nace will be referred to as the “intake”pipe or “combustion
air” pipe. 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 or ABS pipe is typi-
cally used as venting and intake pipe materials. In Canada
ABS is not an approved vent pipe material but it is permissable
to use as combustion air pipe material.
In addition to PVC and ABS pipe and fittings, Innoflue®by
Centrotherm Eco Systems and PolyPro®by M&G Duravent
are also approved vent and combustion air materials for
installations in the U.S.A. and Canada. Manufacturers In-
stallation instructions for these products must be followed.
These products have specific instructions for installing,
joining and terminating. Do not mix materials or compo-
nents of one manufacturer with materials or components of
another manufacturer.
All furnaces are manufactured with 2" vent / intake pipe and
connectors. For furnaces requiring installation of 3" pipe,
the transition from 2" to 3" should be done as close to the
furnace as practically possible.
This furnace must not be connected to Type B, BW, or 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 manufactur-
ers’ recommendations and to verify that all vent/flue piping and
connectors are compatible with furnace flue products. Addition-
ally, it is the responsibility of the installer to ensure that all piping
and connections possess adequate structural integrity and sup-
port to prevent flue pipe separation, shifting, or sagging during
furnace operation.
F AILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN BODILY
INJURY OR DEATH . C AREFULLY READ AND FOLLOW ALL INSTRUCTIONS
GIVEN IN THIS SECTION .
WARNING
U PON COMPLETION OF THE FURNACE INSTALLATION , CAREFULLY
INSPECT THE ENTIRE FLUE SYSTEM BOTH INSIDE AND OUTSIDE OF THE
FURNACE TO ASSURE IT IS PROPERLY SEALED . L EAKS IN THE FLUE
SYSTEM CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH DUE TO
EXPOSURE TO FLUE PRODUCTS , INCLUDING CARBON MONOXIDE .
WARNING

16
DUAL CERTIFICATION: NON-DIRECT/DIRECT VENT
This furnace is dual certified and may be installed as a non-direct
vent (single pipe) or direct vent (dual pipe) appliance. A non-
direct vent installation requires only a vent/flue pipe, while a
directventinstallation requires both a vent/flue pipe and a com-
bustion air intake pipe. Refer to the appropriate section for
details concerning piping size, length, number of elbows, fur-
nace connections, and terminations.
T O AVOID BODILY INJURY , FIRE OR EXPLOSION , SOLVENT CEMENTS
MUST BE KEPT AWAY FROM ALL IGNITION SOURCES ( I . E ., SPARKS , OPEN
FLAMES , AND EXCESSIVE HEAT ) AS THEY ARE COMBUSTIBLE LIQUIDS .
A
VOID BREATHING CEMENT VAPORS OR CONTACT WITH SKIN AND / OR
EYES .
WARNING
MATERIALS AND JOINING METHODS
Two- or three-inch nominal diameter PVC Schedule 40 pipe meet-
ing ASTM D1785, PVC primer meeting ASTM F656, and PVC sol-
vent cement meeting ASTM D2564 specifications must be used.
Fittings must be DWV type fittings meeting ASTM D2665 and
ASTM D3311. Carefully follow the pipe manufacturer’s instruc-
tions for cutting, cleaning, and solvent cementing of PVC.
The use of Schedule 40 PVC cellular core DWV meeting ASTM
F891-1 or ABS cellular core (Foam Core) plastic pipe is also
acceptable as a flue/vent and intake pipe material. PVC primer
meeting ASTM F656 and PVC solvent cement meeting ASTM
D2564 specifications must be used. Fittings must be DWV type
fittings meeting ASTM D2665 and ASTM D3311. Carefully fol-
low the manufactures instructions for cutting, cleaning and sol-
vent cementing of PVC.
For Canadian installations; all PVC pipe, fittings and joining
materials must be UL S636 listed.
NOTE: Requirement does not apply to the combustion air
pipe.
As an alternative to PVC pipe, primer, solvent cement, and
fittings, ABS materials which are in compliance with the
following specifications may be used: Two-or-three-inch solid
wall ABS Schedule 40 pipe must meet ASTM D1527 and, if
used in Canada, must be CSA listed or, two-or-three-inch
cellular core ABS Schedule 40 pipe must meet ASTM F628
and, if used in Canada, must be CSA listed. Solvent cement
for ABS to ABS joints must meet ASTM D2235 and, if used in
Canada, must be CSA listed. The solvent cement for the
PVC to ABS transition joint must meet ASTM D3138. Fittings
must be DWV type fittings meeting ASTM D2661 and ASTM
D3311 and, if used in Canada, must be CSA listed. Carefully
follow the manufacturers’ instructions for cutting, clean-
ing, and solvent cementing PVC and/or ABS.
All 90° elbows must be medium radius (1/4 bend DWV) or long
radius (Long sweep 1/4 bend DWV) types conforming to ASTM
D3311. A medium radius (1/4 bend DWV) elbow measures 3 1/
16” minimum from the plane of one opening to the centerline of
the other opening for 2” diameter pipe, and 4 9/16” minimum
for 3” pipe.
The use of two short radius 45 degree elbows is permit-
ted to provide clearance to refrigerant piping above the
furnace.
PROPER VENT/FLUE AND COMBUSTION AIR PIPING PRACTICES
Adhere to these instructions to ensure safe and proper fur-
nace performance. The length, diameter, and number of el-
bows of the vent/flue pipe and combustion air pipe (when
applicable) affects the performance of the furnace and must
be carefully sized. All piping must be installed in accordance
with local codes and these instructions.
Piping must be adequately secured and supported to prohibit
sagging, joint separation, and/or detachment from the fur-
nace. Horizontal runs of vent/flue and combustion air pip-
ing must be properly supported. PVC pipe supports must be
no more than 5' apart. For ABS pipe, supports must be no
more than 3' apart. Horizontal pipe runs must maintain a
1/4 inch per foot downward slope, back towards the furnace,
to properly return condensate to the furnace’s drain system.
PREFERRED
Figure 6
TRANSITION NO LESS
THAN 45 DEGREES TO
HORIZONTAL PLANE TO
AVOID CREATING A WATER
TRAP IN VENT PIPING.
ACCEPTABLE
Figure 7

17
NO TRANSITION ON
HORIZONTAL PLANE,
THIS CREATESA
WATER TRAPAND
RESTRICTS FLUE
GASES
Figure 8
Precautions should be taken to prevent condensate from freez-
ing inside the vent/flue pipe and/or at the vent/flue pipe
termination. All vent/flue piping exposed to temperatures
below 35°F for extended periods of time must 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) must be insulated with 1/2”
thick closed cell foam. Inspect piping for leaks prior to in-
stalling insulation.
TERMINATION LOCATIONS
NOTE: Refer to LocationRequirements andConsiderationsfor
combustion air contaminant restrictions.
The following bullets and diagram describe the restrictions
concerning the appropriate location of vent/flue pipe and com-
bustion air intake pipe (when applicable) terminations. Refer
to Non-Direct Vent (Single Pipe) Piping and Direct Vent (Dual
Pipe) Piping located in this section for specific details on ter-
mination construction.
• All terminations (flue and/or intake) must be located
at least 12 inches above ground level or the
anticipated snow level.
• Vent terminations (non-direct and direct vent) must
terminate at least 3 feet above any forced air inlet
located within 10 feet.
NOTE: This provision does not apply to the
combustion air intake termination of a direct vent
application.
• 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).
• The vent termination running 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 current edition of CAN/CSA B149.1-
15 takes precedence over the preceding termination
restriction.
CANADIAN VENT PIPE & COMBUSTION AIR PIPE REQUIREMENTS
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-
fied pipe and fittings should be clearly marked with the ULC
standard “S636”. The primer and cement used must be of
the same manufacturer as the vent system. For Royal Pipe
System 636; use GVS-65 Primer (Purple) and GVS-65 PVC Sol-
vent 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 combus-
tion 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 certified. Always follow the manufacturer’s instruc-
tions 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.
The safe operation, as defined by ULC S636, of the vent
system is based on following these installation instruc-
tions, the vent system manufacturer’s installation instruc-
tions, and proper use of primer and cement. It is recom-
mended under this standard, that the vent system be
checked once a year by qualified service personnel. All
fire stops and roof flashings used with this system must
be UL listed. Acceptability under CAN/CSA B149.1-15 is
dependent upon full compliance with all installation in-
structions. Consult the authority having jurisdiction (gas
inspection authority, municipal building department, fire
department, etc.) before installation to determine the need
to obtain a permit. *IPEX System 636™ is a trademark of
IPEX Inc.
Carefully follow the pipe manufacturers’ instructions for cutting,
cleaning, and solvent cementing PVC and/or ABS.
The vent can be run through an existing unused chimney pro-
vided the space between the vent pipe and the chimney is insu-
lated and closed with a weather-tight, corrosion-resistant flash-
ing.

18
DIRECT VENT TERMINAL CLEARANCES
OTHER THAN DIRECT VENT TERMINAL CLEARANCES
v
V
X
1 Inaccordancewith the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
† Aventshall not terminate directly above a sidewalk or paveddrivewaythatislocated between two single family dwellings and serves
bothdwellings.
‡ Permittedonly if veranda, porch, deck or balcony isfully openon a minimumof two sidesbeneath thefloor.
* For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, the following statement shall be included:
“Clearancein accordance withlocalinstallation codesandtherequirements ofthegas supplier andthemanufacturer’s installation instruction.”
1 Inaccordancewiththe current CSA B149.1-15, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
† Avent shall notterminatedirectlyabove a sidewalkorpaveabledriveway that islocatedbetween two single familydwellingsandserves
bothdwelling.
‡ Permittedonly if veranda, porch, deck or balcony isfully openon a minimumof two sidesbeneath thefloor.
* For clearances not specified in ANSI Z223.1/NFPA 54 orCSA B149.1, the following statementshall be included:
“Clearancein accordance withlocalinstallation codes andtherequirements of thegassupplierand themanufacturer’sinstallationinstruction.”
Canadian Installations
1
U.S. Installations
2
I= Clearance to sevice
regulator vent outlet. 3 ft. (91 cm). *
J= Clearance to nonmechanical air
supply inlet to building or the
combustion air inlet to any other
appliance.
6 in. (15 cm) for appliances 10,000
Btuh (3 kW), 12 in. (30 cm) for
appliances > 10,000 Btuh (3kW) and
100,000 Btuh (30 kW), 36 in. (91 cm)
for appliances > 100,000 Btuh (30 kW).
4 ft. (1.2 m) below or to side of
opening; 1 ft. (300 m) above opening.
K= Clearance to a mechanical
air supply inlet. 6 ft. (1.83 m) 3 ft. (91 cm) above if within 10 ft. (3 m) horizontally.
L= Clearance above paved sidewalk or
paved driveway located on public
property.
7 ft. (2.13m) † 7 ft. (2.13m)
M= Clearance under veranda, porch,
deck or balcony. 12 in. (30 cm) ‡ *
Canadian Installations
1
U.S. Installations
2
I= Clearance to service
regulator vent outlet. 3 ft. (91 cm). *
J= Clearance to nonmechanical air
supply inlet to building or the
combustion air inlet to any other
appliance.
6 in. (15 cm) for appliances 10,000
Btuh (3 kW), 12 in. (30 cm) for
appliances > 10,000 Btuh (3kW) and
100,000 Btuh (30 kW), 36 in. (91 cm)
for appliances > 100,000 Btuh (30 kW).
6 in. (15 cm) for appliances 10,000
Btuh (3 kW), 9 in. (23 cm) for
appliances > 10,000 Btuh (3kW) and
50,000 Btuh (15 kW), 12 in. (30 cm) for
appliances > 50,000 Btuh (15 kW).
K= Clearance to a mechanical
air supply inlet. 6 ft. (1.83 m) 3 ft. (91 cm) above if within 10 ft. (3 m) horizontally.
L= Clearance above paved sidewalk or
paved driveway located on public
property.
7 ft. (2.13m) † *
M= Clearance under veranda, porch,
deck or balcony. 12 in. (30 cm) ‡ *
Canadian Installations
1
U.S. Installations
2
A= Clearance above grade,
veranda, porch, deck or
balcony. (See 1.24.6-i(9)b.)
12 in. (30 cm) 12 in. (30 cm)
B= Clearance to window or
door that may be opened. 6 in. (15 cm) for appliances 10,000 Btuh (3 kW), 12 in. (30 cm) for
appliances > 10,000 Btuh (3 kW) and
100,000 Btuh (30 kW), 36 in. (91 cm)
for appliances > 100,000 Btuh (30
kW).
4 ft. (1.2 m) below or to side of
opening; 1 ft. (300 m) above opening.
C= Clearance to permanently
closed window. **
D= Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet (61 cm)
from the center line of the terminal.
**
E= Clearance to unventilated soffit. * *
F= Clearance to outside corner. * *
G= Clearance to inside corner. * *
H= Clearance to each side of center
line extended above meter/regulator
assembly.
3 ft. (91 cm) within a height 15 ft.
(4.5 m) above the meter/regulator
assembly.
*
Canadian Installations
1
U.S. Installations
2
A= Clearance above grade,
veranda, porch, deck or
balcony. (See 1.24.6-i(9)b.)
12 in. (30 cm) 12 in. (30 cm)
B= Clearance to window or
door that may be opened. 6 in. (15 cm) for appliances 10,000 Btuh (3 kW), 12 in. (30 cm) for
appliances > 10,000 Btuh (3 kW) and
100,000 Btuh (30 kW), 36 in. (91 cm)
for appliances > 100,000 Btuh (30
kW).
6 in. (15 cm) for appliances
10,000Btuh (3 kW), 9 in. (23 cm) for
appliances > 10,000 Btuh(3 kW) and
50,000 Btuh (15 kW), 12 in. (30 cm) for
appliances > 500,000 Btuh (15 kW).
C= Clearance to permanently
closed window. **
D= Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet (61 cm)
from the center line of the terminal.
**
E= Clearance to unventilated soffit. * *
F= Clearance to outside corner. * *
G= Clearance to inside corner. * *
H= Clearance to each side of center
line extended above meter/regulator
assembly.
3 ft. (91 cm) within a height 15 ft.
(4.5 m) above the meter/regulator
assembly.
*

19
STANDARD FURNACE CONNECTIONS
It is the responsibility of the installer to ensure that the pip-
ing connections to the furnace are secure, airtight, and ad-
equately supported.
VENT PIPE CONNECTION
The vent pipe outlet is sized to accept 2” pipe. Secure
vent/flue pipe directly into the furnace fitting with the
appropriate glue. Alternately, a small section of 2" pipe
may be glued in the furnace socket and a rubber coupling
installed to allow removal for future service. Combustion
Air and Vent piping should be routed in a manner to avoid
contact with refrigerant lines, metering devices, condensate
drain lines, etc. If necessary, clearances may be increased
by creating an offset using two 45 degree elbows. This
joint can be rotated on the fitting to establish maximum
clearance between refrigerant lines, metering devices, and
condensate drain lines, etc. This joint is the equivalent of
one 90 deg. elbow when considering elbow count.
45 DEGREE
ELBOWS
Increased Clearance
Figure 9A
VENT-DRAIN
Figure 9B
COMBUSTION AIR PIPE
DIRECT VENT INSTALLATIONS
On upflow units secure the combustion air intake pipe to the
air intake coupling by using a take apart rubber coupling
supplied with the furnace or a plastic coupling. Also, the
intake coupling may be inverted to allow the intake pipe
to be glued directly to it. After inverting the coupling,
secure it to the furnace top with screws. On counterflow
units secure the combustion air intake pipe to the air intake
coupling using the rubber coupling and worm gear hose clamps
provided with the unit. The counterflow rubber coupling al-
lows service removal of air intake piping internal to the fur-
nace blower compartment. The combustion air intake pipe
can also be secured directly to the counterflow unit air intake
pipe coupling.
COMBUSTION AIR INTAKE OPTIONS: The RF000142 coupling
can be secured directly to the furnace intake coupling if
condensation is a concern. If the RF000142 is used on the
combustion air inlet, it must be installed with the arrow
pointing up. It should be noted, the combustion air will
actually be moving in a direction opposite of the arrow on
the RF000142 coupling. It must have a field supplied,
trapped drain tube free-draining to proper condensate dis-
posal location. A loop in the drain tube can serve as a
trap. The unused RF000142 drain fitting should be capped.
A tee installed in the intake pipe is also an acceptable method
of catching condensation. It must have a field supplied,
trapped drain tube or pipe, free-draining to proper conden-
sate disposal location. A loop in the drain tube can serve as
a trap.
NON-DIRECTVENTINSTALLATIONS
A minimum of one 90° elbow should be installed on the combus-
tion air intake “coupling” to guard against inadvertent block-
age.
E DGES OF SHEET METAL HOLES MAY BE SHARP . U SE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .
WARNING
ALTERNATE VENT/FLUE LOCATION
The alternate vent/flue location is the large hole directly in
line with the induced draft blower outlet. To use the alter-
nate vent/flue location on an upflow / horizontal model,
refer to the following steps and the “Alternate Vent/Flue Lo-
cation” figure. This feature is not currently available on
counterflow models.
NOTE: In the horizontal left installation position, a means
of condensate collection must be provided to keep vent
pipe condensate from entering the draft inducer housing.
If the vent-drain elbow is eliminated from the installation;
an RF000142 kit must be used.

20
Insert flange. Cut 2 ½” long.
R 000142F
Figure 10
Vent/Flue Pipe Cuts
Figure 11
1. Remove screws from vent flange.
2. Remove internal elbow and vent pipe.
3. Cut pipe 2 1/2” from 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 & secure
with clamps.
7. Secure flange to cabinet using screws removed in step
1.
Figure 12
Floor
Use alternate vent
& combination air locations
DOWN VENTING UPFLOW MODEL FURNACES ONLY
Basement/Crawlspace
Condensate trapped
to prevent flue gas from escaping
and routed to field supplied
condensate disposal
Combustion Air Pipe
Vent Pipe
All piping and fittings must be joined per material manufacturer’s specifications
to prevent separation and flue gas leaks.
Both Pipes Terminated
Outside Structure
1/4” per foot min. slope
6’ MAX.
Field Supplied
Drain Tee on Vent Pipe