Amana MVM97 Series User manual




(Type FSP CATEGORY IV Direct
or Non Direct Vent Air Furnace)
These furnaces comply with requirements
embodied in the American National Stan-
dard / National Standard of Canada ANSI
Z21.47·CSA-2.3 Gas Fired Central Furnaces.
Installer:
Ax 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 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.
IOG-2007H
09/2022
19001 Kermier Rd., Waller, TX 77484
www.goodmanmfg.com • www.amana-hac.com
© 2021-2022 Daikin Comfort Technologies Manufacturing, L.P.
is a registered trademark of Maytag Corporation or its related companies
and is used under license. All rights reserved.
ONLY PERSONNEL THAT HAVE BEEN TRAINED TO IN-
STALL, ADJUST, SERVICE, MAINTENANCE OR REPAIR
(HEREINAFTER, “SERVICE”) THE EQUIPMENT SPECIFIED
IN THIS MANUAL SHOULD
SERVICE THE EQUIPMENT. THE MANUFACTURER WILL
NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY
DAMAGE ARISING FROM IMPROPER SERVICE OR SER-
VICE PROCEDURES. IF YOU SERVICE THIS UNIT, YOU AS-
SUME RESPONSIBILITY FOR ANY INJURY OR PROPERTY
DAMAGE WHICH MAY RESULT. IN ADDITION, IN
JURISDICTIONS THAT REQUIRE ONE OR MORE LICENSES
TO SERVICE THE EQUIPMENT SPECIFIED IN THIS
MANUAL, ONLY LICENSED PERSONNEL SHOULD SERVICE
THE EQUIPMENT.
IMPROPER INSTALLATION, ADJUSTMENT, SERVICING,
MAINTENANCE OR REPAIR OF THE EQUIPMENT SPECI-
FIED IN THIS MANUAL, OR ATTEMPTING TO INSTALL, AD-
JUST, SERVICE OR REPAIR THE EQUIPMENT SPECIFIED IN
THIS MANUAL WITHOUT PROPER TRAINING MAY RESULT
IN PRODUCT DAMAGE, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
WARNING
WARNING
DO NOT BYPASS SAFETY DEVICES
90% HEX
DO NOT LIFT
PRODUCT USING
HEAT EXCHANGER

TABLE OF CONTENTS
THE MANUFACTURER WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES. IF
YOU INSTALL OR PERFORM SERVICE ON THIS UNIT, YOU ASSUME RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE WHICH MAY RESULT.
MANY JURISDICTIONS REQUIRE ALICENSE TO INSTALL OR SERVICE HEATING AND AIR CONDITIONING EQUIPMENT.
WARNING
Safety Considerations .........................................4
Shipping Inspection ............................................5
Electrostatic Discharge (ESD) Precautions .................5
To The 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 Certication: 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 In Canada ............................... 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
Upow Model Installed Vertically ......................... 24
Drain Exiting Right Side ..................................... 24
Drain Exiting Left Side ...................................... 24
Upow Model Installed Horizontally
with Right Side Down .................................... 25
Upow Model Installed Horizontally
with Left Side Down ....................................... 25
Upow Model Installed Horizontally
With Left Side Down - Alternate ........................ 26
Counterow Model Installed Vertically ................... 26
Drain Exiting Left Side ...................................... 26
NOTE: This equipment has been tested and found to comply with
the limits for a Class B digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment o󰀨 and
on, the user is encouraged to try to correct the interference by one or
more of the following measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and
receiver.
—Connect the equipment into an outlet on a circuit di󰀨erent
from that to which the receiver is connected.
—Consult the dealer or an experienced radio/ TV technician
for help.
This equipment complies with FCC radiation exposure limits. To ensure
compliance, human proximity to the antenna shall not be less than
20 cm during normal operations.
This device, which was assembled by Daikin Comfort Technologies
Manufacturing, L.P., contains a component that is classied as an
intentional radiator. This intentional radiator has been certied by the
FCC: FCC ID QOQBGM13P. And this international radiator has an
Industry Canada ID: IC 5123A-BGM13P.
This device complies with Part 15 of the FCC’s Rules. Operation of
this device is subject to two conditions:
(1) This device may not cause harmful interference; and
(2) This device must accept any interference received, including
interference that may cause undesirable operation.
And this device meets the applicable Industry Canada technical
specications.
The manufacturer of the intentional radiator (model no. BGM13P) is
Silicon Laboratories Finland Oy, which can be contacted by calling
617-951-0200. (www.silabs.com)
Daikin Comfort Technologies Manufacturing, L.P. may be contacted by
calling 713-861-2500, or at 19001 Kermier Rd., Waller TX 77484.
(www.daikincomfort.com)

TABLE OF CONTENTS
Drain Exiting Right Side ..................................... 27
Counterow Model Installed Horizontally
with Right Side Down .................................... 27
Counterow 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 Humidier) ................ 31
24 Volt Humidier............................................ 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 [Upow Models]............. 36
Filters - Read This Section
Before Installing The Return Air Duct work ............ 37
Upright Installations ......................................... 38
Horizontal Installations ..................................... 39
Startup Procedure & Adjustment .......................... 39
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 O Delay Timings............................. 45
ComfortNet™ System ........................................ 45
Overview ...................................................... 45
Airow 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
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
(Qualied Servicer Only) .................................. 54
Flame Sensor (Qualied 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


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 PROPANE GAS/
HIGH ALTITUDE INSTALLATIONS section of this manual
Install this furnace only in a location and position as speci-
ed in LOCATION REQUIREMENTS & CONSIDERATIONS section
and INSTALLATION POSITIONS section of this manual.
Provide adequate combustion and ventilation air to the
furnace as specied in COMBUSTION & VENTILATION AIR
REQUIREMENTS section of this manual.
Combustion products must be discharged to the outdoors.
Connect this furnace to an approved vent system only, as
specied in VENT/FLUE PIPE & COMBUSTION AIR PIPE 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
GAS SUPPLY AND PIPING 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 OPERATIONAL
CHECKS section of these instructions.
When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space con-
taining 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-red furnace for installation in a residential garage
must be installed as specied in the LOCATION REQUIRE-
MENTS AND 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 PRODUCT APPLICATION section of this manual.
T O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER
INSTALLATION , ADJUSTMENT , ALTERATION , SERVICE OR MAINTENANCE ,
REFER TO THIS
MANUAL . F
OR
ADDITIONAL ASSISTANCE OR
INFORMATION , CONSULT A QUALIFIED INSTALLER , SERVICER AGENCY OR
THE GAS SUPPLIER .
WARNING
I F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED
EXACTLY , A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY
DAMAGE
, PERSONAL INJURY OR LOSS OF LIFE .
D O NOT STORE OR USE GASOLINE
OR
OTHER
FLAMMABLE VAPORS
AND
LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE .
D
O NOT TRY TO LIGHT ANY APPLIANCE .
D
O NOT TOUCH ANY ELECTRICAL SWITCH ; DO NOT USE ANY PHONE
IN YOUR BUILDING .
I
MMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR ’ S
PHONE . F OLLOW THE GAS SUPPLIER ’ S INSTRUCTIONS .
I
F YOU CANNOT REACH YOUR GAS SUPPLIER , CALL THE FIRE
DEPARTMENT .
I
NSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED
INSTALLER , SERVICE AGENCY OR THE GAS SUPPLIER .
WHAT TO DO IF YOU SMELL GAS:
�
�
�
�
WARNING
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
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.

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.
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

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 Landing, or
indemnity bond.
• Original paid freight bill or indemnity in lieu
thereof.
• Original or certied copy of the 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.




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 sameelectrostatic 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 thorough-
ly to familiarize yourself with specic items which must be
adhered to, including but not limited to: unit maximum ex-
ternal static pressure, gas pressures, BTU input rating, prop-
er electrical connections, circulating air temperature rise,
minimum or maximum CFM, and motor speed connections.


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 airow conguration,
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 ther-
mostat and a non-ComfortNet compatible single stage air
conditioning unit. However, this reduces the benets of the
ComfortNet system as the enhancements will only apply to
the furnace.
The modulating furnace operation is based o of negative
pressure created by the draft inducer. The furnace control
board receives commands from the room thermostat.
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 frequency drive (VFD).
The inducer, pressure switches, and gas valve are linked by
pneumatic tubing. The gas valve modulates based on this
negative pressure.
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
5
9
4
3
12
16
28
32
11
14 15
30
17
18
2
19
21
27
24
25
20
23
26
20
22
13
30
29
31
1
6
77
888
Both Sides
10
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

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

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
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
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
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
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
 


 



 



 

 






• 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 passage-
way 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 installation
and operation instructions, all local building codes and
ordinances. In their absence, follow the latest edition of
the National Fuel Gas Code (NFPA 54/ANSI Z223.1), and/or
CAN/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 Con-
ditioning 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

Follow the instructions listed below and the guidelines
provided in the Combustion and Ventilation Air Require-
ments 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 pro-
posed 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 applica-
ble. 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 ue and/
or combustion air piping can be a limiting factor in
the location of the furnace.
• Locate the furnace so condensate ows down-
wards 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 combus-
tion 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 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 com-
bustible material. The only combustible materi-
al allowed is wood.
• 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.
(Note: A subbase will not be required if an air
conditioning coil is located beneath the furnace
between the supply air opening and the combus-
tible oor.
• Exposure to contaminated combustion air will re-
sult in safety and performance-related 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 con-
taminated by any of the above substances. This
protects the non-direct vent furnace from air-
borne contaminants. To ensure that the enclosed
non-direct vent furnace has an adequate supply of
combustion air, air must be ducted in from a near-
by uncontaminated room or from outdoors. Refer
to the Combustion and Ventilation Air Require-
ments 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 exchang-
er failure will result if the cooling coil is placed
upstream 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 sili-
cone 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 de-
tails.) 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. Fol-
low 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. (NOTE: The subbase
will not be required if an air conditioning coil is
installed between the supply air opening on the
furnace and the oor.)

      
Upflow 3" 0" 0" 1" 0" C
Horizontal Alc o ve 6" 0" 4" 0" C
C = If placed on combustible floor, floor MUST be wood only.
       

NOTES:
• 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 pre-
cedence over clearances from the enclosure where
accessibility clearances are greater.
NOTES:
• 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 pre-
cedence over clearances from the enclosure where
accessibility clearances are greater.
      
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.



TOP
BOTTOM
SIDE SIDE SIDE
TOP
BOTTOM
Upflow Counterflow Horizontal
Installations must adhere to the clearances to combus-
tible 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 permanently maintained. Clearances
must also accommodate an installation’s gas, electrical,
and drain trap and drain line connections.
NOTE: In addition to the required clearances to combus-
tible materials, a minimum of 24 inches service clearance
must be available in front of the unit.





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 sys-
tem 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 restric-
tion, leakage, corrosion and other deciencies 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
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 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, replace dampers and any other gas
burning appliance to their previous conditions of use
If resizing is required on any portion of the venting sys-
tem, 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.

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.

Improved construction and additional insulation in build-
ings 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. Ap-
pliances that pull air out of the house (clothes dryers,
exhaust fans, replaces, etc.) increase the problem by
starving appliances of air.
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

House depressurization can cause back drafting or im-
proper combustion of gas-red appliances, thereby expos-
ing building 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 determin-
ing the combustion air requirements for the appliances.
Most homes will require outside air be supplied to the
furnace area by means of ventilation grilles or ducts
connecting directly to the outdoors or spaces open to the
outdoors such as attics or crawl spaces.

*MVM97 models may be installed upow or horizontal-
ly with left or right side down. *CVM97 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 basepan. 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). NOTE: Ductwork must
never be attached to the back of the furnace. Refer to
“Recommended Installation Positions” gure for appro-
priate installation positions, ductwork connections, and
resulting airow arrangements.



Recommended Installation Positions

When installing a furnace horizontally, additional consid-
eration 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
suspended 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-lo-
cated 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 o excess tubing.

In horizontal applications the condensate drain trap is se-
cured to the furnace side panel, suspending it below the
furnace. A minimum clearance of 5 1/2 inches below the
furnace must be provided for the drain trap. Additionally,
the appropriate downward piping slope must be main-
tained 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 approxi-
mately 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.

This manual will refer to the pipe that discharges prod-
ucts 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. A condensing gas furnace achieves
its high level of eciency 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 ue gas temperature and water con-
densation requirements, PVC or ABS pipe is typically 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 ttings, 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. and Canada. Manufactur-
ers 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.
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 anoth-
er appliance or use a vent which is used by a solid fuel
appliance.
It is the responsibility of the installer to follow the man-
ufacturers’ recommendations and to verify that all vent/
ue piping and connectors are compatible with furnace
ue products. Additionally, it is the responsibility of the
installer to ensure that all piping and connections pos-
sess adequate structural integrity and support to prevent
ue 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


This furnace is dual certied 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/ue pipe, while a direct vent installation requires
both a vent/ue pipe and a combustion air intake pipe.
Refer to the appropriate section for details concerning
piping size, length, number of elbows, furnace connec-
tions, and terminations.

Two- or three-inch nominal diameter PVC Schedule 40
pipe meeting ASTM D1785, PVC primer meeting ASTM
F656, and PVC solvent cement meeting ASTM D2564 speci-
cations must be used. Fittings must be DWV type ttings
meeting ASTM D2665 and ASTM D3311. Carefully follow
the pipe manufacturer’s instructions 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 ue/vent and intake pipe material.
PVC primer meeting ASTM F656 and PVC solvent cement
meeting ASTM D2564 specications must be used. Fittings
must be DWV type ttings meeting ASTM D2665 and ASTM
D3311. Carefully follow the manufactures instructions for
cutting, cleaning and solvent cementing of PVC.
For Canadian installations; all PVC pipe, ttings and join-
ing 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 ttings, ABS materials which are in compliance with
the following specications 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,
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
two-or-three-inch cellular core ABS Schedule 40 pipe must
meet ASTM F628 and, if used in Canada, must be CSA list-
ed. Solvent cement for ABS to ABS joints must meet ASTM
D2235 and, if used in Canada, must be CSA listed. The sol-
vent cement for the PVC to ABS transition joint must meet
ASTM D3138. Fittings must be DWV type ttings meeting
ASTM D2661 and ASTM D3311 and, if used in Canada, must
be CSA listed. Carefully follow the manufacturers’ instruc-
tions for cutting, cleaning, 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 open-
ing 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.


Adhere to these instructions to ensure safe and proper
furnace performance. The length, diameter, and number
of elbows of the vent/ue pipe and combustion air pipe
(when applicable) aects 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 pro-
hibit sagging, joint separation, and/or detachment from
the furnace. Horizontal runs of vent/ue and combustion
air piping 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.

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
PREFERRED



Precautions should be taken to prevent condensate from
freezing inside the vent/ue pipe and/or at the vent/ue
pipe termination. All vent/ue piping exposed to tem-
peratures below 35°F for extended periods of time must
be insulated with 1/2” thick closed cell foam. Also, all
vent/ue piping exposed outdoors in excess of the termi-
nations shown in this manual (or in unheated areas) must
be insulated with 1/2” thick closed cell foam. Inspect
piping for leaks prior to installing insulation.

NOTE: Refer to Location Requirements and Consider-
ations for combustion air contaminant restrictions.
The following bullets and diagram describe the restric-
tions concerning the appropriate location of vent/ue
pipe and combustion 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 specic details on termination construction.
• All terminations (ue and/or intake) must be locat-
ed 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
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
must terminate at least 12 inches from any open-
ing through which ue 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 va-
por 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 termina-
tion restriction.


All installations in Canada must conform to the require-
ments 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 Sys-
tem 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 certied. 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 dened by ULC S636, of the vent
system is based on following these installation instruc-
tions, the vent system manufacturer’s installation in-
structions, and proper use of primer and cement. It is
recommended under this standard, that the vent system
be checked once a year by qualied service personnel. All
re stops and roof ashings 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, re
department, etc.) before installation to determine the
need to obtain a permit. *IPEX System 636™ is a trade-
mark of IPEX Inc.
Carefully follow the pipe manufacturers’ instructions for
cutting, cleaning, and solvent cementing PVC and/or ABS.

v
V
X

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
10,000 Btuh (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.
*
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
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) ‡ *
1. In accordance with the current CSA B149.1, Natural Gas and Propane Instal-
lation Code.
2. In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway
that is located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck or balcony is fully open on a mini-
mum of two sides beneath the oor.
* For clearances not specied in ANSI Z223.1/nfpa 54 or CSA B149.1, the
following statement shall be included:
“Clearance in accordance with local installation codes and the requirements of the
gas supplier and the manufacturer’s installation instruction.”

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) ‡*
1. In accordance with the 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.
† A vent shall not terminate directly above a sidewalk or paveable driveway
that is located between two single family dwellings and serves both dwelling.
‡ Permitted only if veranda, porch, deck or balcony is fully open on a mini-
mum of two sides beneath the oor.
* For clearances not specied in ANSI Z223.1/nfpa 54 or CSA B149.1, the
following statement shall be included:
“Clearance in accordance with local installation codes and the requirements of the
gas supplier and the manufacturer’s installation instruction.”

The vent can be run through an existing unused chimney
provided the space between the vent pipe and the chim-
ney is insulated and closed with a weather-tight, corro-
sion-resistant ashing.

It is the responsibility of the installer to ensure that the
piping connections to the furnace are secure, airtight,
and adequately supported.

The vent pipe outlet is sized to accept 2” pipe. Secure
vent/ue pipe directly into the furnace tting 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. Combus-
tion 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 oset using two 45 degree el-
bows. This joint can be rotated on the tting 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
VENT-DRAIN


On upow 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
counterow 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 coun-
terow rubber coupling allows service removal of air in-
take piping internal to the furnace blower compartment.
The combustion air intake pipe can also be secured
directly to the counterow unit air intake pipe coupling.
COMBUSTION AIR INTAKE OPTIONS: The RF000142 cou-
pling 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 combus-
tion 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 ac-
ceptable 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.

A minimum of one 90° elbow should be installed on the
combustion air intake “coupling” to guard against inad-
vertent blockage.

The alternate vent/ue location is the large hole direct-
ly in line with the induced draft blower outlet. To use
the alternate vent/ue location on an upow / horizon-
tal model, refer to the following steps and the “Alternate
Vent/Flue Location” gure. This feature is not currently
available on counterow models.
 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.
E DGES OF SHEET METAL HOLES MAY BE SHARP . U SE GLOVES AS A
PRECAUTION WHEN REMOVING HOLE PLUGS .
WARNING

Insert flange. Cut 2 ½” long.
R 000142
F



1. Remove screws from vent ange.
2. Remove internal elbow and vent pipe.
3. Cut pipe 2 1/2” from ange.
4. Remove cabinet plug adjacent to inducer outlet and
install an original cabinet vent hole.
5. Install RF000142 coupling on inducer outlet.
6. Install anged vent section removed in step 2 & se-
cure with clamps.
7. Secure ange to cabinet using screws removed in step
1.


(Upow / Horizontal models only)
When using the alternate venting location, either in a hor-
izontal left side down installation or a vertical installation
using down – venting, an alternate combustion air opening
can used. A locating dimple is located on the right side of
the furnace cabinet. The locating dimple is 1 7/8” mea-
sured from the front edge of the cabinet in line with the
knock out. To use the alternate combustion air location:
1. Remove screws and combustion air ange from cabi-
net.
2. Insert cabinet plug in unused combustion air hole.
3. Drill a pilot hole at the cabinet dimple (size dictated
by knockout tool used).
4. Use a knockout tool to create a 3” diameter hole
5. Install combustion air ange and secure with screws
removed in step one.

For installations at or above 7,000 feet altitude, use
3” venting. Refer to the following table for applicable
length, elbows, and pipe diameter for construction of the
vent/ue pipe system. The tee used in the vent/ue ter-
mination must be counted as an elbow when determining
the number of elbows in the piping system.
1. Maximum allowable limits listed on individual lengths
for inlet and ue and NOT a combination.
2. Minimum requirement for each vent pipe is ve (5)
feet in length and one elbow/tee.
3. Tee used in the vent/ue termination must be includ-
ed when determining the number of elbows in the
piping system.
1234 5 67 8
2 or 2 1/2 115 110 105 100 95 90 85 80
3137 130 123 116 109 102 95 88
2 or 2 1/2 115 110 105 100 95 90 85 80
3147 140 133 126 119 112 105 98
2 or 2 1/2 60 55 50 45 40 35 30 25
3120 113 106 99 92 85 78 71
2 or 2 1/2 40 35 30 25 20 15 10 5
3144 137 130 123 116 109 102 95
2 or 2 1/2 40 35 30 25 20 15 10 5
3144 137 130 123 116 109 102 95
2 or 2 1/2 95 90 85 80 75 70 65 60
3144 137 130 123 116 109 102 95
2 or 2 1/2 95 90 85 80 75 70 65 60
3144 137 130 123 116 109 102 95
2 or 2 1/2 60 55 50 45 40 35 30 25
3120 113 106 99 92 85 78 71
2 or 2 1/2 40 35 30 25 20 15 10 5
3103 96 89 82 75 68 61 54
*MVM970803BNA*
*MVM970804CNA*
*MVM971005CNA*
*CVM971005CNA*
*MVM971205DNA*
*CVM970603BNA*
*CVM970803BNA*
*CVM970804CNA*
Direct Vent (2 - Pipe) and Non-Direct Vent (1- Pipe)
(6)
Pipe
Size
Model
Number of Elbows
*MVM970603BNA*
4. 2 1/2” or 3” diameter pipe can be used in place of 2”
diameter pipe.
5. Increased Clearance Congurations using (2) 45 deg.
elbows should be considered equivalent to one 90
deg. elbow.
6. One 90° elbow should be secured to the combustion
air intake connection.
7. For installations at or above 7,000 feet altitude, use
3” venting.

NOTE: If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
The vent/ue pipe may terminate vertically, as through a
roof, or horizontally, as through an outside wall.
Vertical vent/ue pipe terminations should be as shown in
the following gure. Refer to Vent/Flue Pipe and Com-
bustion Air Pipe - Termination Locations for details con-
cerning location restrictions. The penetration of the vent
through the roof must be sealed tight with proper ashing
such as is used with a plastic plumbing vent.
Horizontal vent/ue pipe terminations should be as shown
in the following gure. Refer to Vent/Flue Pipe and Com-
bustion Air Pipe - Termination Locations for details con-
cerning location restrictions. The wall penetration should
be sealed with silicone caulking material.
NOTE: Terminate both pipes in the same pressure zone
(same side of roof, no major obstacles between pipes,
etc.).


STRAIGHT
ELBOWS

VENT/FLUE TEE (
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
OPTIONAL)
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
12" MIN.





If there is a dierence between the vent and combustion
air pipes, count the pipe with the most ttings. Elbows
and/or tees used in the terminations must be included
when determining the number of elbows in the piping
systems.
If the combustion air intake pipe is to be installed above
a nished ceiling or other area where dripping of conden-
sate will be objectionable, insulation of the combustion
air pipe may be required. Use 1/2” thick closed cell
foam insulation such as Armaex™ or Insultube™ where
required.





Center to center = 10” min / 24” max.
Vertical separation: 0” - 24”
Vent termination from wall = 8” min / 12” max.
Combustion air intake from wall = 6” max.
Vent and intake clearance to ground
or anticipated snow level = 12” min.










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 terminations 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
horizontally 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.



Refer to the directions provided with the Concentric Vent
Kit (DCVK) 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 installed with the intake and exhaust pipes locat-
ed side-by-side or with one pipe above the other. These
kits are NOT intended for use with single pipe (indirect
vent) installations.
Refer to the directions furnished with the Side Wall Vent
Kit (p/n 0170K00000S or 0170K00001S) for installation
specications.

A condensing gas furnace achieves its high level of e-
ciency by extracting heat from the products of combus-
tion 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 de-
tails 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 installa-
tion.
• 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 fur-
nace, a common drain may be used. An open tee
must be installed in the drain line, near the cooling
coil, to relieve positive air pressure from the coil’s
plenum. This is necessary to prohibit any interfer-
ence 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 except for a counterow when the in-
staller desires the drain to exit the right side. All furnace
models installed horizontally require the trap to be relo-
cated. Many drain hoses have a built–in grommet which
will provide a cabinet seal when installed. See following
instructions for your model and installation position.
NOTE: Both sides of the drain trap must be primed prior
to initial furnace start up.

Drain the furnace and air conditioning coil if applicable,
in compliance with code requirements. In horizontal or
counterow installations, 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.