Bryant 140, 140E, 312AAV, 312JAV Installation, Start-up, Operating And Service And Maintenance Instructions

312AAV/JAV
2--STAGE DELUXE, INDUCED COMBUSTION
4--WAY MULTIPOISE GAS FURNACE

Installation, Start--up, Operating and

Service and Maintenance Instructions

Series 140/E

SAFETY CONSIDERATIONS 2........................

INTRODUCTION 3..................................

CODES AND STANDARDS 5..........................

Safety 5...........................................

General Installation 5................................

Combustion and Ventilation Air 5......................

Duct Systems 5.....................................

Acoustical Lining and Fibrous Glass Duct 5...............

Gas Piping and Gas Pipe Pressure Testing 5...............

Electrical Connections 5..............................

Venting 5.........................................

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS

PROCEDURE 5.....................................

LOCATION 6.......................................

AIR FOR COMBUSTION AND VENTILATION 7.........

INSTALLATION 10..................................

UPFLOW INSTALLATION 10......................

DOWNFLOW INSTALLATION 11...................

HORIZONTAL INSTALLATION 11..................

FILTER ARRANGEMENT 15.......................

AIR DUCTS 15...................................

GAS PIPING 17..................................

ELECTRICAL CONNECTIONS 21..................

VENTING 26....................................

START--UP, ADJUSTMENT, AND SAFETY CHECK 33.....

General 33........................................

Start--Up Procedures 34..............................

Adjustments 34.....................................

Check Safety Controls 39.............................

Checklist 39.......................................

SERVICE AND MAINTENANCE PROCEDURES 44.....

Introduction 44...................................

Care and Maintenance 45...........................

Sequenceof Operation 49...........................

Wiring Diagrams 52...............................

Troubleshooting 52................................

Accessory List 55.................................

PARTS REPLACEMENT INFORMATION GUIDE 56.....

I

G

S

E

N

D

C

E

E

R

I

T

F

I

Use of the AHRI Certified TM Mark indicates a
manufacturer’s participation in the program. For
verification of certification for individual products,
go to www.ahridirectory.org.

ISO 9001:2000

D

REGISTERED

Always Ask For

NOTE: Read the entire instruction manual before starting the
installation.

Portions of the text and tables are reprinted from NFPA 54/ANSI
Z223.1--2009E, with permission of National Fire Protection
Association, Quincy, MA 02269 and American Gas Association,
Washington DC 20001. This reprinted material is not the
complete and official position of the NFPA or ANSI on the
referenced subject, which is represented only by the standard in
its entirety.

A

B

[736.9]

29

Ø7/8

[22.2]

ACCESSORY

5 15/16
[150.7]

28.39

[721.2]

Ø7/8

[22.2]

ACCESSORY

14 7/8
[337.3]

(BOTH SIDES)

Ø7/8
[22.2]
ACCESSORY

Ø7/8

[22.2]

ACCESSORY

Ø1 3/4
[44.5]
GAS ENTRY

Ø1/2
[12.7]
THERMOSTAT WIRE ENTRY

22 1/16

[560]

SIDE INLET

(BOTH SIDES)

11 7/16
[290.7]

9 11/16
[245.4]

[197.8]

7 13/16

Ø7/8
[22.2]

J.BOX PROVISION

Ø7/8
[22.2]
JUNCTION BOX
LOCATION

Ø1 3/4
[44.5]
GAS ENTRY

1 15/16
[49.2]

1

[25.4]

1 1/4
[31.8]

29 9/16
[750.7]

1 15/16

[49.2]

5 5/8

[143.3]

5 7/16

[138.5]

6 13/16
[172.3]

Ø1/2

[12.7]

THERMOSTAT WIRE ENTRY

19

[481.7]

OUTLET

D

21.6

[549.5]

BOTTOM INLET

C

33 1/4

[843.9]

9 9/16
[243.3]

3/4

[19.1]

5 7/8
[148.5]

3 7/16
[86.8]

9 7/8

[250.7]

27 3/4
[704.7]

2 5/16
[59]

FRONT OF CASING

TOP OF CASING

4 13/16
[122.2]

27 3/4
[704.7]

5 7/8

[148.5]

8 5/8
[219]

5 1/2
[140.3]

8 7/16
[213.5]

FRONT OF CASING

TOP OF CASING

6.1

[155.7]

2 1/16
[51.6]

5.1

5.1

[130.5]

1.7
[43.5]

Ø7/8
[22.2]
ACCESSORY (2)

AIR FLOW

AIR FLOW

BOTTOM RETURN

WIDTH

AIR FLOW

KNOCK OUTS FOR
VENTING(5
PLACES)

[130.5]

2 1/16
[51.6]

1.7
[43.5]

Ø7/8
[22.2]
ACCESSORY (2)

FRONT OF CASING

8 5/8
[219]

6 13/16

FRONT OF CASING

1 15/16
[49.2]

5 15/16
[150.7]

5 1/2
[140.3]

8 7/16
[213.5]

9 7/8

[250.7]

27 3/4
[704.7]

33 1/4

[843.9]

312AAV

NOTES:

1. Two additional 7/8 --- in. (22 mm) diameter holes are located in the top plate.

2. Minimum return ---air openings at furnace, based on metal duct. If flex duct is used, see flex duct manufacturer’s recommendations for equivalent diameters.

AIR FLOW

ACCESSORY

THERMOSTAT WIRE ENTRY

ACCESSORY

21.6

[549.5]

BOTTOM INLET

28.39

[721.2]

29

[736.9]

Ø7/8

[22.2]

Ø7/8

[22.2]

Ø1/2

[12.7]

6.1

[155.7]

3 7/16
[86.8]

5 7/8
[148.5]

2 5/16
[59]

TOP OF CASING

Ø7/8
[22.2]
JUNCTION BOX
LOCATION

Ø1 3/4
[44.5]
GAS ENTRY

AIR FLOW

A

BOTTOM RETURN

WIDTH

TOP OF CASING

3/4

[19.1]

29 9/16
[750.7]

27 3/4
[704.7]

KNOCK OUTS FOR
VENTING(5
PLACES)

[148.5]

5 7/16

[138.5]

4 13/16
[122.2]

9 9/16
[243.3]

J.BOX PROVISION

ACCESSORY

5 7/8

[172.3]

[143.3]

1 15/16

[49.2]

Ø7/8

[22.2]

Ø7/8

[22.2]

5 5/8

AIR FLOW

19

[481.7]

OUTLET

Ø1/2
[12.7]
THERMOSTAT WIRE ENTRY

Ø1 3/4
[44.5]
GAS ENTRY

Ø7/8
[22.2]
ACCESSORY

22 1/16

[560]

SIDE INLET

(BOTH SIDES)

a. For 800 CFM---16 ---in. (406 mm) round or 14 1/2 x 12---in. (368 x 305 mm) rectangle.

b. For 1200 CFM---20 ---in. (508 mm) round or 14 1/ 2 x 19 1/2 ---in. (368 x 495 mm) rectangle.

c. For 1600 CFM---22 ---in. (559 mm) round or 14 1/ 2 x 22 1/16 ---in. (368 x 560mm) rectangle.

d. For airfl ow requirements above 1800 C FM, see Air Delivery table in Product Data literature for specific use of single side inlets. The use of both sideinlets,

a combination of 1 side and the bottom, or the bottom only will ensure adequate return air openings f o r airflow requirements above 1800 CFM.

7 13/16

[197.8]

14 7/8
[337.3]

(BOTH SIDES)

[25.4]

9 11/16
[245.4]

1 1/4
[31.8]

A10290

11 7/16
[290.7]

A

FURNACE SIZE

045 ---08/024045 14--- 3/16 (360) 12---9/16 (319) 9--- 5/16 (237) 12---11/16 (322) 4 (102) 104 (47) 16 (406)
045 ---12/036045 14--- 3/16 (360) 12---9/16 (319) 9--- 5/16 (237) 12---11/16 (322) 4 (102) 107 (49) 16 (406)
070 ---08/024070 14--- 3/16 (360) 12---9/16 (319) 9--- 5/16 (237) 12---11/16 (322) 4 (102) 111 (50) 16 (406)
070 ---12/036070 14--- 3/16 (360) 12---9/16 (319) 9--- 5/16 (237) 12---11/16 (322) 4 (102) 115 (52) 16 (406)
070 ---16/048070 17---1/2 (445) 15--- 7/8 (403) 11--- 9/16 (294) 16 (406) 4 (102) 126 (57) 16 (406)
090 ---14/042090 17---1/2 (445) 15--- 7/8 (403) 11--- 9/16 (294) 16 (406) 4 (102) 127 (58) 16 (406)
090 ---16/048090 21 (533) 19 --- 3/8 (492) 13--- 5/16 (338) 19--- 1/2 (495) 4 (102) 140 (64) 20 (508)
090 ---20/060090 21 (533) 19 --- 3/8 (492) 13--- 5/16 (338) 19--- 1/2 (495) 4 (102) 146 (66) 20 (508)

CABINET

WIDTH

OUTLET WIDTH

110 ---12/036110 17---1/2 (445) 15--- 7/8 (403) 11--- 9/16 (294) 16 (406) 4 (102) 135 (61) 16 (406)
110 ---16/048110 21 (533) 19 --- 3/8 (492) 13--- 5/16 (338) 19--- 1/2 (495) 4 (102) 146 (66) 20 (508)
110 ---22/066110 21 (533) 19 --- 3/8 (492) 13--- 5/16 (338) 19--- 1/2 (495) 4 (102) 152 (69) 20 (508)
135 ---16/048135 21 (533) 19 --- 3/8 (492) 13--- 5/16 (338) 19--- 1/2 (495) 4 (102){ 149 (68) 20 (508)

135 ---22/066135 24---1/2 (622) 22--- 7/8 (581) 15--- 1/16 (383) 23 (584) 4 (102){ 163 (74) 24 (610)
155 ---20/060155 24---1/2 (622) 22--- 7/8 (581) 15--- 1/16 (383) 23 (584) 4 (102){ 170 (77) 24 (610)

*135 and 155 size furnaces require a 5 or 6---in. (127 or 152 mm) vent. Use a vent adapter between furnace and vent stack. See Installation Instructions for
complete installation requirements.

Fig. 1 -- Dimensional Drawing

Table 1 – Dimensions -- In. (mm)

B

C

TOP &

BOTTOM FLUE

COLLAR

INLET WIDTH

2

D

BOTTOM

VENT

CONNECTION

SIZE

SHIP WT

LB (KG)

ACCESSORY

FILTER MEDIA

CABINET

SAFETY CONSIDERATIONS

!

WARNING

FIRE, EXPLOSION, ELECTRICAL SHOCK, AND
CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in dangerous
operation, serious injury, death, or property damage.

Improper installation, adjustment, alteration, service,
maintenance, or use could cause carbon monoxide
poisoning, explosion, fire, electrical shock, or other
conditions which may cause personal injury or property
damage. Consult a qualified service agency, local gas
supplier, or your distributor or branch for information or
assistance. The qualified service agency must use only
factory--authorized and listed kits or accessories when
modifying this product.

!

FURNACE RELIABILITY HAZARD

Improper installation or misapplication of furnace may
require excessive servicing or cause premature component
failure.

Application of this furnace should be indoors with special
attention given to vent sizing and material, gas input rate,
air temperature rise, unit leveling, and unit sizing.

!

CUT HAZARD

Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care

and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.

Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock, or
other conditions which may cause death, personal injury, or
property damage. Consult a qualified installer, service agency, or
your distributor or branch for information or assistance. The
qualified installer or agency must use factory--authorized kits or
accessories when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Have a fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions
include in literature and attached to the unit. Consult local
building codes, the current editions of the National Fuel Gas
Code (NFGC) NFPA 54/ANSI Z223.1 and the National
Electrical Code (NEC) NFPA 70.

Recognize safety information. This is the safety--alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING,and

CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which will result in

severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is
used to identify unsafe practices which may result in minor
personal injury or product and property damage. NOTE is used
to highlight suggestions which will result in enhanced
installation, reliability, or operation.

CAUTION

CAUTION

.

product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.

1. Use only with type of gas approved for this furnace. Refer
to the furnace rating plate.

2. Install this furnace only in a location and position as spe­cified in the “Location” section of these instructions.

3. Provide adequate combustion and ventilation air to the
furnace space as specified in “Air for Combustion and
Ventilation” section.

4. Combustion products must be discharged outdoors. Con­nect this furnace to an approved vent system only, as spe­cified in the “Venting” section of these instructions.

5. Never test for gas leaks with an open flame. Use a com­mercially available soap solution made specifically for the
detection of leaks to check all connections, as specified in
the “Gas Piping” section.

6. Always install furnace to operate within the furnace’s in­tended temperature--rise range with a duct system which
has an external static pressure within the allowable range,
as specified in the “Start--Up, Adjustments, and Safety
Check” section. See furnace rating plate.

7. When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space con­taining the furnace, the return air shall also be handled by
duct(s) sealed to the furnace casing and terminating out­side the space containing the furnace. See “Air Ducts” sec­tion.

8. A gas--fired furnace for installation in a residential garage
must be installed as specified in the warning box in the
“Location” section.

9. The furnace may be used for construction heat provided
that the furnace installation and operation complies with
the first CAUTION in the LOCATION section of these in­structions.

10. These Multipoise Gas--Fired Furnaces are CSA (formerly
A.G.A. and C.G.A.) design--certified for use with natural
and propane gases (see furnace rating plate) and for install­ation in alcoves, attics, basements, closets, utility rooms,
crawlspaces, and garages. The furnace is factory--shipped
for use with natural gas. A CSA (A.G.A. and C.G.A.) lis­ted accessory gas conversion kit is required to convert fur­nace for use with propane gas.

11. See Fig. 2 for required clearances to combustible construc­tion.

12. Maintain a 1--in. (25 mm) clearance from combustible ma­terials to supply air ductwork for a distance of 36 inches
(914 mm) horizontally from the furnace. See NFPA 90B
or local code for further requirements.

13. These furnaces SHALL NOT be installed directly on car­peting, tile, or any other combustible material other than
wood flooring. In downflow installations, factory access­ory floor base MUST be used when installed on combust­ible materials and wood flooring. Special base is not re­quired when this furnace is installed on manufacturer’s
Coil Assembly Part No. CAR, CAP, CNRV, CNPV or
when Coil Box Part No. KCAKC is used. See Fig. 2 for
clearance to combustible construction information.

INTRODUCTION

The Series 140/E 4--way multipoise Category I fan--assisted
furnace is CSA (formerly A.G.A. and C.G.A.) design--certified. A
Category I fan--assisted furnace is an appliance equipped with an
integral mechanical means to either draw or force products of
combustion through the combustion chamber and/or heat
exchanger. The furnace is factory--shipped for use with natural

312AAV

3

gas. This furnace is not approved for installation in mobile
homes, recreational vehicles, or outdoors.

These furnaces shall not be installed directly on carpeting, tile, or
any other combustible material other than wood flooring. For
downflow installations, a factory accessory floor base must be
used when installed on combustible materials and wood flooring.
This special base is not required when this furnace is installed on
the manufacturer’s coil assembly, or when the manufacturer’s coil
box is used. See Fig. 2 for clearance to combustible material
information.

This furnace is designed for minimum continuous return--air
temperature of 60_F(16_C) db or intermittent operation down to

312AAV

55_F(13_C) db such as when used with a night setback
thermostat. Return--air temperature must not exceed 80_F(27_C)
db. Failure to follow these return--air temperature limits may
affect reliability of heat exchangers, motors, and controls. (See
Fig. 3.)

For accessory installation details, refer to the applicable
instruction literature.

NOTE: Remove all shipping brackets and materials before
operating the furnace.

A10269

Fig. 2 -- Clearances to Combustibles

4

80 / 27 C

60

/ 16 C

A06745

Fig. 3 -- Return Air Temperature

CODES AND STANDARDS

Follow all national and local codes and standards in addition
to these instructions. The installation must comply with

regulations of the serving gas supplier, local building, heating,
plumbing, and other codes. In absence of local codes, the
installation must comply with the national codes listed below and
all authorities having jurisdiction.

In the United States, follow all codes and standards for the
following:

Step 1 — Safety

National Fuel Gas Code (NFGC) NFPA 54--2009/ANSI
Z223.1--2009 and the Installation Standards, Warm Air Heating
and Air Conditioning Systems ANSI/NFPA 90B

Step 2 — General Installation

Current edition of the NFGC and the NFPA 90B. For copies,
contact the National Fire Protection Association Inc.,
Batterymarch Park, Quincy, MA 02269; (www.NFPA.org) or for
only the NFGC, contact the American Gas Association, 400 N.
Capitol Street, N.W., Washington DC 20001 (www.AGA.org.)

Step 3 — Combustion and Ventilation Air

Section 9.3 of the NFGC, NFPA 54/ ANSI Z223.1--2009 Air for
Combustion and Ventilation

Step 4 — Duct Systems

Air Conditioning Contractors Association (ACCA) Manual D,
Sheet Metal and Air Conditioning Contractors National
Association (SMACNA), or American Society of Heating,
Refrigeration, and Air Conditioning Engineers (ASHRAE) 2001
Fundamentals Handbook Chapter 34 or 2000 HVAC Systems
and Equipment Handbook Chapters 9 and 16.

Step 5 — Acoustical Lining and Fibrous Glass Duct

Current edition of SMACNA and NFPA 90B as tested by UL
Standard 181 for Class I Rigid Air Ducts

Step 6 — Gas Piping and Gas Pipe Pressure Testing

NFPA 54 / ANSI Z223.1--2009; chapters 5, 6, 7, and 8 and
National Plumbing Codes

Step 7 — Electrical Connections

National Electrical Code (NEC) ANSI/NFPA 70--2008

Step 8 — Venting

NFGC; NFPA 54 / ANSI Z223.1--2009 chapters 12 and 13

ELECTROSTATIC DISCHARGE (ESD)

PRECAUTIONS PROCEDURE

!

CAUTION

FURNACE RELIABILITY HAZARD

Improper installation or service of furnace may cause
premature furnace component failure.

Electrostatic discharge can affect electronic components.
Follow the Electrostatic Discharge Precautions Procedure
listed below during furnace installation and servicing to
protect the furnace electronic control. Precautions will
prevent electrostatic discharges from personnel and hand
tools which are held during the procedure. These
precautions will help to avoid exposing the control to
electrostatic discharge by putting the furnace, the control,
and the person at the same electrostatic potential.

1. Disconnect all power to the furnace. Multiple disconnects
may be required. DO NOT TOUCH THE CONTROL OR
ANY WIRE CONNECTED TO THE CONTROL PRIOR
TO DISCHARGING YOUR BODY’S
ELECTROSTATIC CHARGE TO GROUND.

2. Firmly touch the clean, unpainted, metal surface of the fur­nace chassis which is close to the control. Tools held in a
person’s hand during grounding will be satisfactorily dis­charged.

3. After touching the chassis, you may proceed to service the
control or connecting wires as long as you do nothing to
recharge your body with static electricity (for example;
DO NOT move or shuffle your feet, do not touch un­grounded objects, etc.).

4. If you touch ungrounded objects (and recharge your body
with static electricity), firmly touch a clean, unpainted
metal surface of the furnace again before touching control
or wires.

5. Use this procedure for installed and uninstalled (ungroun­ded) furnaces.

6. Before removing a new control from its container, dis­charge your body’s electrostatic charge to ground to pro­tect the control from damage. If the control is to be in­stalled in a furnace, follow items 1 through 4 before
bringing the control or yourself in contact with the fur­nace. Put all used and new controls into containers before
touching ungrounded objects.

7. An ESD service kit (available from commercial sources)
mayalsobeusedtopreventESDdamage.

312AAV

5

THE BLOWER IS LOCATED

TO THE RIGHT OF THE

BURNER SECTION, AND

AIR CONDITIONED AIR IS

DISCHARGED TO THE LEFT.

THE BLOWER IS

LOCATED BELOW THE

BURNER SECTION, AND

CONDITIONED AIR IS

DISCHARGED UPWARD.

THE BLOWER IS

LOCATED ABOVE THE

BURNER SECTION, AND

312AAV

CONDITIONED AIR IS

DISCHARGED DOWNWARD

LOCATION

GENERAL

This multipoise furnace is shipped in packaged configuration.
Some assembly and modifications are required when used in any
of the four applications shown in Fig. 4.

NOTE: For high--altitude installations, the high--altitude
conversion kit MUST be installed at or above 5500 ft. (1676 M)
above sea level. Obtain high--altitude conversion kit from your
area authorized distributor.

This furnace must:
S be installed so the electrical components are protected from

water.

S not beinstalled directly onany combustible material other than

wood flooring for upflow applications. Downflow installations
require use of a factory--approved floor base or coil assembly
when installed on combustible materials or wood flooring (refer
to SAFETY CONSIDERATIONS).

S be located close to the chimney or vent and attached to an air

distribution system. Refer to Air Ducts section.

S be provided ample space for servicing and cleaning. Always

comply with minimum fire protection clearances shown on the
furnace clearance to combustible construction label.

The following types of furnace installations may require
OUTDOOR AIR for combustion due to chemical exposures:

S Commercial buildings
S Buildings with indoor pools
S Laundry rooms
S Hobby or craft rooms, and
S Chemical storage areas

If air is exposed to the following substances, it should not be used
for combustion air, and outdoor air may be required for

combustion:

S Permanent wave solutions
S Chlorinated waxes and cleaners
S Chlorine based swimming pool chemicals

Fig. 4 -- Multipoise Orientations

S Water softening chemicals
S De--icing salts or chemicals
S Carbon tetrachloride
S Halogen type refrigerants
S Cleaning solvents (such as perchloroethylene)
S Printing inks, paint removers, varnishes, etc.
S Hydrochloric acid
S Cements and glues
S Antistatic fabric softeners for clothes dryers

S Masonry acid washing materials

CARBON MONOXIDE POISONING AND UNIT
DAMAGE HAZARD

Failure to follow this warning could result in personal
injury or death, and furnace damage.

Corrosive or contaminated air may cause failure of parts
containing flue gas, which could leak into the living space.
Air for combustion must not be contaminated by halogen
compounds, which include fluoride, chloride, bromide, and
iodide. These elements can corrode heat exchangers and
shorten furnace life. Air contaminants are found in aerosol
sprays, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products. Do not install
furnace in a corrosive or contaminated atmosphere. Make
sure all combustion and circulating air requirements are met,
in addition to all local codes and ordinances.

All fuel--burning equipment must be supplied with air for fuel
combustion. Sufficient air must be provided to avoid negative
pressure in the equipment room or space. A positive seal must be
made between the furnace cabinet and the return--air duct to
prevent pulling air from the burner area and from draft safeguard
opening.

!

WARNING

THE BLOWER IS

LOCATED TO THE LEFT

OF THE BURNER SECTION,

AND CONDITIONED AIR IS

DISCHARGED TO THE RIGHT.

A02097

6

!

WARNING

!

CAUTION

FIRE, INJURY OR DEATH HAZARD

Failure to follow this warning could result in personal
injury, death, and/or property damage.

When the furnace is installed in a residential garage, the
burners and ignition sources must be located at least 18
inches (457 mm) above the floor. The furnace must be
located or protected to avoid damage by vehicles. When the
furnace is installed in a public garage, airplane hangar, or
other building having a hazardous atmosphere, the furnace
must be installed in accordance with the NFGC. (See Fig.

5.)

18-IN. (457.2 mm)

MINIMUM TO BURNERS

A93044

Fig. 5 -- Installation in a Garage

!

WARNING

FIRE HAZARD

Failure to follow this warning could result in personal
injury, death and/or property damage.

Do not install the furnace on its back or hang furnace with
control compartment facing downward. Safety control
operation will be adversely affected. Never connect
return--air ducts to the back of the furnace. (See Fig. 6.)

PROPERTY DAMAGE HAZARD

Improper use or installation of this furnace may cause
premature component failure. This gas furnace may be used
for construction heat provided that:

--The furnace is permanently installed with all electrical
wiring, piping, venting and ducting installed according to
these installation instructions. A return air duct is provided,
sealed to the furnace casing, and terminated outside the
space containing the furnace. This prevents a negative
pressure condition as created by the circulating air blower,
causing a flame roll--out and/or drawing combustion
products into the structure.

--The furnace is controlled by a thermostat. It may not be
”hot wired” to provide heat continuously to the structure
without thermostatic control.

--Clean outside air is provided for combustion. This is to
minimize the corrosive effects of adhesives, sealers and
other construction materials. It also prevents the
entrainment of drywall dust into combustion air, which can
cause fouling and plugging of furnace components.

--The temperature of the return air to the furnace is
maintained between 55_F(13_C) and 80_F(27_C), with
no evening setback or shutdown. The use of the furnace
while the structure is under construction is deemed to be
intermittent operation per our installation instructions.

--The air temperature rise is within the rated rise range on
the furnace rating plate, and the gas input rate has been set
to the nameplate value.

--The filters used to clean the circulating air during the
construction process must be either changed or thoroughly
cleaned prior to occupancy.

--The furnace, ductwork and filters are cleaned as necessary
to remove drywall dust and construction debris from all
HVAC system components after construction is completed.

--Verify proper furnace operating conditions including
ignition, gas input rate, air temperature rise, and venting
according to these installation instructions.

LOCATION RELATIVE TO COOLING EQUIPMENT

The cooling coil must be installed parallel with, or on the
downstream side of the unit to avoid condensation in the heat
exchangers. When installed parallel with the furnace, dampers or
other flow control must prevent chilled air from entering the
furnace. If the dampers are manually operated, they must be
equipped with means to prevent operation of either unit unless
the damper is in the full--heat or full--cool position.

312AAV

Fig. 6 -- Prohibit Installation on Back

AIR FOR COMBUSTION AND

VENTILATION

Provisions for adequate combustion, ventilation, and dilution air
must be provided in accordance with:

U.S. installations: Section 9.3 of the NFPA 54 /A ANSI
Z223.1--2009, Air for Combustion and Ventilation, and
applicable provisions of the local building codes.

A02054

7

!

CAUTION

FURNACE CORROSION HAZARD

Failure to follow this caution may result in furnace damage.
Air for combustion must not be contaminated by halogen

compounds, which include fluoride, chloride, bromide, and
iodide. These elements can corrode heat exchangers and
shorten furnace life. Air contaminants are found in aerosol
sprays, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products.

!

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal
injury or death.

The operation of exhaust fans, kitchen ventilation fans,

312AAV

clothes dryers, attic exhaust fans or fireplaces could create a
NEGATIVE PRESSURE CONDITION at the furnace.
Make--up air MUST be provided for the ventilation devices,
in addition to that required by the furnace. Refer to Carbon
Monoxide Poisoning Hazard warning in venting section of
these instructions to determine if an adequate amount of
make--up air is available.

The requirements for combustion and ventilation air depend upon
whether or not the furnace is located in a space having a volume
of at least 50 cubic feet per 1,000 Btuh input rating for all gas
appliances installed in the space.

S Spaces having less than 50 cubic feet per 1,000 Btuh require the

Outdoor Combustion Air Method.

S Spaces having at least 50 cubic feet per 1,000 Btuh may use the

Indoor Combustion Air, Standard orKnown Air Infiltration
Method.

Outdoor Combustion Air

Method

1. Provide the space with sufficient air for proper combus­tion, ventilation, and dilution of flue gases using perman­ent horizontal or vertical duct(s) or opening(s) directly
communicating with the outdoors or spaces that freely
communicate with the outdoors.

2. Fig. 7 illustrates how to provide TWO OUTDOOR
OPENINGS, one inlet and one outlet combustion and
ventilation air opening, to the outdoors.

e. One opening MUST commence within 12 in. (300 mm)

of the ceiling and the second opening MUST commence
within 12 in. (300 mm) of the floor.

f. Size openings and ducts per Fig. 7 and Table 2.

2

g. TWOHORIZONTALDUCTS require1 --in

per 2,000 Btuh (1,100 mm

2

/kW) of combined input for

of freearea

all gas appliances in the space per Fig.7 and Table 2.

h. TWO OPENINGS OR VERTICAL DUCTS require 1

2

of free area per 4,000Btuh (550mm2/kW) for com-

-- i n
bined input of all gas appliances in the space per Fig. 7
and Table 2.

3. ONE OUTDOOR OPENING requires:

a. One square inch of free area per 3,000 Btuh (734

2

/kW)for combined input of all gas appliancesin the

mm
space per Table 2 and

b. Not less than the sum of the areas of all vent connectors

in the space.

Table 2 – Minimum Free Area Required for Each Combustion Air opening of Duct to Outdoors

FURNACE

INPUT

(BTUH)

44,000 22 (14194) 6 (152) 14.7 (9484) 5 (127) 11 (7096) 4 (102)
66,000 33 (21290) 7 (178) 22 (14193) 6 (152) 16.5 (10645) 5 (127)

88,000 44 (28387) 8 (203) 29.3 (18903) 7 (178) 22 (14193) 6 (152)
110,000 55 (35484) 9 (229) 36.7 (23677) 7 (178) 27.5 (17742) 6 (152)
132,000 66 (42580) 10 (254) 44 (28387) 8 (203) 33 (21290) 7 (178)
154,000 77 (49677) 10 (254) 51.3 (33096) 9 (229) 38.5 (24839) 8 (203)

TWO HORIZONTAL DUC TS SINGLE DUCT OR OPENING TWO OPENINGS OR VERTICAL DUCTS

(1 SQ. IN./2,000 BTUH) (1,100 SQ. MM/KW) (1 SQ. IN./3,000 BTUH) (734 SQ. MM/KW) (1 SQ. IN./4,000 BTUH) (550 SQ. MM/KW)

Free Area of Opening

and Duct

Sq. In. (Sq. mm)

Round Duct

Dia.

In. (mm)

Free Area of Opening

and Duct

Sq. In. (Sq. mm)

Round Duct

Dia.

In. (mm)

Free Area of Opening

and Duct

Sq. In. (Sq. mm)

Round Duct

Dia.

In. (mm)

EXAMPLES: Determining Free Area

FURNACE WATER HEATER TOTAL INPUT

110,000 + 30,000 = (140,000 divided by 4,000) = 35.0 Sq. In. for each two Vertical Ducts or Openings

66,000 + 40,000 = (106,000 divided by 3,000) = 35.3 Sq. In. for a Single Duct or Opening
88,000

+ 30,000 = (118,000 divided by 2,000) = 59.0 Sq. In. for each of two Horizontal Ducts

8

1 SQ IN.

E

12 ″ MAX

(305mm)

1 SQ IN.
PER 4000
BTUH*

PER 4000
BTUH*

F

1 SQ IN .

BTUH*

1 SQ IN .

BTUH*

G

12 ″
MAX

PER

4000

OUTDOORS

PER
4000

12 ″
MAX

DUCTS

TO

O UTDOORS

(305mm)

12 ″ MAX

1 SQ IN.
PER 2000
BTUH*

DUCT S

TO

OUTDOORS

1 SQ IN.
PER 2000
BTUH*

(305mm)

12 ″ MAX

CIRCULA TING AIR DUCT S

*Minimum dimensions of 3 ---in. (76 mm).
Note: Use any of the following combinations of openings:

A&BC&DD&EF&G

B

AIR DUCTS

C IRCULA TING

A

OF COMB USTION AIR

CLEARANCE IN FRONT

D

VENT
THR OUGH
R OOF

(76mm)

AT LEAST 3 IN .

OPENINGS SHALL BE

C

DUCT

TO

OUTDOORS

Fig. 7 -- Air for Combustion, Ventilation, and Dilution for

Outdoors

(305mm)

(305mm)

A03174

CIRCULATING AIR

DUCTS

INTERIOR

HEATED

SPACE

CIRCULATING AIR DUCTS

* Minimum opening size is 100 sq in. (64516 sq. mm) with minimum

dimensions of 3 in. (76 mm)

†Minimumof3in.(76mm)whentype-B1ventisused.

VENT THROUGH ROOF

12" MAX

1 SQ IN.
PER 1000
BTUH* IN DOOR
OR WALL

UNCONFINED
SPACE

(152mm)

6" MIN
(FRONT)

1 SQ IN.
PER 1000
BTUH* IN DOOR

OPENINGS SHALL BE AT LEAST 3 IN.

OR WALL

CLEARANCE IN FRONT OF COMBUSTION AIR

12" MA X

(305mm)

Ü

(305mm)

A03175

Fig. 8 -- Air for Combustion, Ventilation, and Dilution from

Indoors

312AAV

The opening shall commence within 12 in. (300 mm) of the
ceiling. Appliances in the space shall have clearances of at least 1
in. (25 mm) from the sides and back and 6 in. (150 mm) from the
front. The opening shall directly communicate with the outdoors
or shall communicate through a vertical or horizontal duct to the
outdoors or spaces (crawl or attic) that freely communicate with
the outdoors.

Indoor Combustion Air
Known--Air--Infiltration Rate

E NFPA & AGA Standard and

Methods

Indoor air is permitted for combustion, ventilation, and dilution,
if the Standard or Known--Air--Infiltration Method is used.

!

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in death and/or
personal injury.

Many homes require air to be supplied from outdoors for
furnace combustion, ventilation, and dilution of flue gases.
The furnace combustion air supply must be provided in
accordance with this instruction manual.

The Standard Method:

1. The space has no less volume than 50 cubic feet per 1,000
Btuh of the maximum input ratings for all gas appliances
installed in the space and

2. The air infiltration rate is not known to be less than 0.40
air changes per hour (ACH).

The Known Air Infiltration Rate Method shall be used, if the
infiltration rate is known to be:

1. Less than 0.40 ACH and

2. Equal to or greater than 0.10 ACH

Infiltration rates greater than 0.60 ACH shall not be used. The
minimum required volume ofthe space varies with the number of
ACH and shall be determined per Table 3 or Equations 1 and 2.
Determine the minimum required volume for each appliance in
the space and add the volumes together to get the total minimum
required volume for the space.

9

Table 3 – Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors

OTHER THAN FAN---ASSISTED TOTAL

ACH

0.60 1,050 1,400 1,750 1,100 1,650 2,200 2,750 3,300 3,850

0.50 1,260 1,680 2,100 1,320 1,980 2,640 3,300 3,960 4,620

0.40 1,575 2,100 2,625 1,650 2,475 3,300 4,125 4,950 5,775

0.30 2,100 2,800 3,500 2,200 3,300 4,400 5,500 6,600 7,700

0.20 3,150 4,200 5,250 3,300 4,950 6,600 8,250 9,900 11,550

0.10 6,300 8,400 10,500 6,600 9,900 13,200 16,500 19,800 23,100

0.00 NP NP NP NP NP NP NP NP NP

NP = Not Permitted

Table 3--Minimum Space Volumes were determined by using
the following equations from the National Fuel Gas Code ANSI

Z223.1--2009/NFPA 54--2009, 9.3.2.2:

1. For other than fan--assisted appliances, such as a draft

hood--equipped water heater:

312AAV

Volume

2. For fan--assisted appliances such as this furnace:

Volume

If:

= combined input of all other than fan--assisted

I

other

= combined input of all fan--assisted appliances in

I

fan

ACH = air changes per hour (ACH shall not exceed 0.60.)

The following requirements apply to the Standard Method and
to the Known Air Infiltration Rate Method.

1. Adjoining rooms can be considered part of a space if:
a. There are no closeable doors between rooms.

b. Combining spaces on same floor level. Each opening

shall have free area of at least 1 in.
mm
in the space, but not less than 100 in.
opening shall commence within 12 in. (300 mm) of the
ceiling and the second opening shall commence within
12 in. (300 mm) of the floor. The minimum dimension
of air openings shall be at least 3 in. (80 mm). (See Fig.

8.)

c. Combining space on different floor levels. The volumes

of spaces on different floor levels shall be considered as
communicating spaces if connected by oneor moreper­manent openings in doors or floors having free area of
at least 2 in.
rating of all gas appliances.

2. An attic or crawlspace may be considered a space that

freely communicates with the outdoors provided there are
adequate permanent ventilation openings directly to out­doors having free area of at least 1--in.2/4,000 Btuh of
total input rating for all gas appliances in the space.

3. In spaces that use the Indoor Combustion Air Method, in-

filtration should be adequate to provide air for combus­tion, permanent ventilation and dilution of flue gases.

(1,000s BTUH GAS INPUT RATE)

30 40 50 44 66 88 110 132 154

SpaceVolume(ft.3)

3

21ft

=

Other

Fan

appliances in Btuh/hr

Btuh/hr

2

/kW) of the total input rating of all gas appliances

ACH

3

15ft

=

ACH

2

/1,000 Btuh (4,400 mm2/kW) of totalinput

I

other

1000 Btu/hr

I

fan

1000 Btu/hr

2

/1,000 Btuh (2,000

2

(0.06 m2). One

A04002

Combination of Indoor and Outdoor

1. Indoor openings shall comply with the Indoor Combus-

A04003

2. Outdoor openings shall be located as required in the Out-

3. Outdoor openings shall be sized as follows:

UPFLOW INSTALLATION
Bottom Return Air

These furnaces are shipped with bottom closure panel installed in
bottom return--air opening. Remove and discard this panel when
bottom return air is used. To remove bottom closure panel,
perform the following:

1. Tilt or raise furnace and remove 2 screws holding bottom

2. Rotate bottom filler panel downward to release holding

3. Remove bottom closure panel.

4. Reinstall bottom filler panel and screws.

Side Return Air

These furnaces are shipped with bottom closure panel installed in
bottom return--air opening. This panel MUST be in place when
only side return air is used.

FAN---ASSISTED TOTAL

(1,000s BTUH GAS INPUT RATE)

However, in buildings with unusually tight construction,
additional air MUST be provided using the methods de­scribed in the Outdoor Combustion Air Method section.
Unusually tight construction is defined as Construction
with:

a. Walls and ceilings exposed to the outdoors have a con-

tinuous, sealed vapor barrier. Openings are gasketed or

sealed and
b. Doors and openable windows are weatherstripped and
c. Other openings are caulked or sealed. These include

joints around window and door frames, between sole

plates and floors, between wall--ceiling joints, between

wall panels, at penetrations for plumbing, electrical and

gas lines, etc.

Air

tion Air Method below and,

door Combustion Air Method mentioned previously and,

a. Calculate the Ratio of all Indoor Space volume divided

by required volume for IndoorCombustion Air Meth-

od below.
b. Outdoor opening size reduction Factor is 1 minus the

Ratio in a. above.
c. Minimum size of Outdoor openings shall be the size re-

quiredinOutdoorCombustionAirMethodabovemul-

tiplied by reduction Factor in b. above. The minimum

dimension ofair openings shall be not lessthan 3 in. (80

mm).

INSTALLATION

Inlet

filler panel. (See Fig. 9.)

tabs.

Inlet

10

NOTE: Side return--air openings can be used in UPFLOW and
most HORIZONTAL configurations. Do not use side return--air
openings in DOWNFLOW configuration.

Bottom
Closure Panel

Bottom Filler Panel

A10273

Fig. 9 -- Removing Bottom Closure Panel

Leveling Legs (If Desir

ed)

In upflow position with side return inlet(s), leveling legs may be
used. (See Fig. 10.) Install field--supplied, 5/16 x 1--1/2 in. (8 x
38 mm) (max) corrosion--resistant machine bolts, washers and
nuts.

NOTE: Bottom closure must be used when leveling legs are
used. It may be necessary to remove and reinstall bottom closure
panel to install leveling legs. To remove bottom closure panel, see
item 1 in Bottom Return Air Inlet section in Step 1 above.

To install leveling legs:

1. Position furnace on its back. Locate and drill a hole in
each bottom corner of furnace. (See Fig. 10.)

2. For each leg, install nut on bolt and then install bolt and
nut in hole. (Install flat washer if desired.)

3. Install another nut on other side of furnace base. (Install
flat washer if desired.)

4. Adjust outside nut to provide desired height, and tighten
inside nut to secure arrangement.

5. Reinstall bottom closure panel if removed.

5/

16 ″

(8mm)

(8mm)

5/

16 ″

1 3 / 4 ″

(44mm)

3

1

/ 4 ″

(44mm)

(8mm)

5

/ 16 ″

(8mm)

5/

16 ″

1

(44mm)

3/

4 ″

3/

1

4 ″

A89014

(44mm)

Fig. 10 -- Leveling Legs

DOWNFLOW INSTALLA

TION

NOTE: For downflow applications, this furnace is approved for

use on combustible flooring when any one of the following 3
accessories are used:

S Special Base, KGASB
S Cased Coil Assembly Part No. CNPV, CNRV, CAP, and CAR
S Coil Box Part No. KCAKC

1. Determine application being installed from Table 4.

2. Construct hole in floor per Table 4 and Fig. 11.

3. Construct plenum to dimensions specified in Table 4 and
Fig. 11.

4. If downflow subbase, KGASB is used, install as shown in
Fig. 12. If Coil Assembly Part No. CNPV, CNRV, CAP,
CAR or Coil Box Part No. KCAKC is used, install as
shown in Fig. 13.

NOTE: It is recommended that the perforated supply--air duct
flanges be completely folded over or removed from furnace when
installing the furnace on a factory--supplied cased coil or coil box.
To remove the supply--air duct flange, use wide duct pliers or
hand seamers to bend flange back and forth until it breaks off. Be
careful of sharp edges. (See Fig. 14.)

Bottom Return Air

Inlet

These furnaces are shipped with bottom closure panel installed in
bottom return--air opening. Remove and discard this panel when
bottom return air is used. To remove bottom closure panel,
perform the following:

1. Tilt or raise furnace and remove 2 screws holding bottom
filler panel. (See Fig. 9.)

2. Rotate bottom filler panel downward to release holding
tabs.

3. Remove bottom closure panel.

4. Reinstall bottom filler panel and screws.

HORIZONTAL INSTALLA

TION

The furnace can be installed horizontally in an attic or crawl space
on either the left--hand (LH) or right--hand (RH) side. The furnace
can be hung from floor joists, rafters or trusses or installed on a
non--combustible platform, blocks, bricks or pad.

!

WARNING

FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD

Failure to follow this warning could result in personal
injury, death, or property damage.

Do not install the furnace on its back or hang furnace with
control compartment facing downward. Safety control
operation will be adversely affected. Never connect
return--air ducts to the back of the furnace.

Suspended Furnace Support

The furnace may be supported under each end with threaded rod,
angle iron or metal plumber’s strap as shown. (See Fig. 15 and

16.) Secure angle iron to bottom of furnace as shown.
Heavy--gauge sheet metal straps (plumber’s straps) may be used
to suspend the furnace from each bottom corner. To prevent
screws from pulling out, use 2 #8 x 3/4--in. (19 mm) screw into
the side and 2 #8 x 3/4--in. (19 mm) screw in the bottom of the
furnace casing for each strap. (See Fig. 15 and 16.)

If the screws are attached to ONLY the furnace sides and not the
bottom, the straps must be vertical against the furnace sides and
not pull away from the furnace sides, so that the strap attachment
screws are not in tension (are loaded in shear) for reliable support.

312AAV

11

Platform Furnace

Support

Construct working platform at location where all required furnace
clearances are met. (See Fig. 2 and 17.) For furnaces with 1--in.
(25 mm) clearance requirement on side, set furnace on
non--combustible blocks, bricks or angle iron. For crawlspace
installations, if the furnace is not suspended from the floor joists,
the ground underneath furnace must be level and the furnace set
on blocks or bricks.

Roll--Out Pr

otection

Provide a minimum 17--3/4--in. x 22--in. (451 x 559 mm) piece of
sheet metal for flame roll--out protection in front of burner area
for furnaces closer than 12 inches (305 mm) above the
combustible deck or suspended furnaces closer than 12 inches
(305 mm) to joists. The sheet metal MUST extend underneath the
furnace casing by 1 in. (25 mm) with the door removed.

The bottom closure panel on furnaces of widths 17--1/2 in. (445
mm) and larger may be used for flame roll--out protection when
bottom of furnace is used for return air connection. See Fig. 17.
for proper orientation of roll--out shield.

Bottom Return Air

312AAV

Inlet

These furnaces are shipped with bottom closure panel installed in
bottom return--air opening. Remove and discard this panel when
bottom return air is used. To remove bottom closure panel,
perform the following:

1. Tilt or raise furnace and remove 2 screws holding bottom
filler panel. (See Fig. 9.)

2. Rotate bottom filler panel downward to release holding
tabs.

3. Remove bottom closure panel.

4. Reinstall bottom filler panel and screws.

Side Return Air

Inlet

These furnaces are shipped with bottom closure panel installed in
bottom return--air opening. This panel MUST be in place when
side return air inlet(s) are used without a bottom return air inlet.

FURNACE

(OR COIL CASING

WHEN USED)

COMBUSTIBLE

FLOORING

DOWNFLOW

SUBBASE

SHEET METAL

PLENUM

FLOOR

OPENING

Fig. 12 -- Furnace, Plenum, and Subbase installed on a

Combustible Floor

FURNACE

APPROVED

COIL ASSEMBLY

OR

COIL BOX

A96285

A

PLENUM

OPENING

B

OPENING

D

FLOOR

C

Fig. 11 -- Floor and Plenum Opening Dimensions

A96283

COMBUSTIBLE

FLOORING

SHEET METAL

PLENUM

FLOOR

OPENING

A08556

Fig. 13 -- Furnace, Plenum, and Coil Assembly or Coil Box

Installed on a Combustible Floor

12

Table 4 – Opening dimensions -- In. (mm)

FURNACE

CASING

WIDTH

14–3/16

(376)

17–1/2

(445)

21

(533)

24--- 1/2

(622)

APPLICATION

Upflow Applications on Combustible or Noncombustible Floor-

ing (KGASB subbase not required)

Downflow Applications on Noncombustible Flooring (KGASB

subbase not required)

Downflow applications on combustible flooring (KGASB sub-

base required)

Downflow Applications on Combustible Flooring with CNPV,

CNRV, CAR, or CAP Coil Assembly or KCAKC coil box

(KGASB subbase not required)

Upflow Applications on Combustible or Noncombustible Floor-

ing (KGASB subbase not required)

Downflow Applications on Noncombustible Flooring (KGASB

subbase not required)

Downflow applications on combustible flooring (KGASB sub-

base required)

Downflow Applications on Combustible Flooring with CNPV,

CNRV, CAR, or CAP Coil Assembly or KCAKC coil box

(KGASB subbase not required)

Upflow Applications on Combustible or Noncombustible Floor-

ing (KGASB subbase not required)

Downflow Applications on Noncombustible Flooring (KGASB

subbase not required)

Downflow applications on combustible flooring (KGASB sub-

base required)

Downflow Applications on Combustible Flooring with CNPV,

CNRV, CAR, or CAP Coil Assembly or KCAKC coil box

(KGASB subbase not required)

Upflow Applications on Combustible or Noncombustible Floor-

ing (KGASB subbase not required)

Downflow Applications on Noncombustible Flooring (KGASB

subbase not required)

Downflow applications on Combustible flooring (KGASB sub-

base required)

Downflow Applications on Combustible Flooring with CNPV,

CNRV, CAR, or CAP Coil Assembly or KCAKC coil box

(KGASB subbase not required)

PLENUM OPENING FLOOR OPENING

A B C D

12--- 11/16

(322)

12--- 9/16

(319)

11--- 13/16

(284)

12--- 5/16

(319)

16

(406)

15--- 7/8

(403)

15--- 1/8

(384)

15--- 1/2

(394)

19--- 1/2

(495)

19--- 3/8

(492)

18--- 5/8

(473)

19

(483)

23

(584)

22--- 7/8

(581)

22--- 1/8

(562)

22--- 1/2

(572)

21--- 5/8

(549)

19

(483)

19

(483)

19

(483)

21--- 5/8

(549)

19

(483)

19

(483)

19

(483)

21--- 5/8

(549)

19

(483)

19

(483)

19

(483)

21--- 1/8

(537)

19

(483)

19

(483)

19

(483)

13--- 5/16

(338)

13--- 3/16

(335)

13--- 7/16

(341)

13--- 5/16

(338)

16--- 5/8

(422)

16--- 1/2

(419)

16--- 3/4

(425)

16--- 1/2

(419)

20--- 1/8

(511)

20

(508)

20--- 1/4

(514)

20

(508)

23--- 5/8

(600)

23--- 1/2

(597)

23--- 3/4

(603)

23--- 1/2

(597)

22--- 1/4

(565)

19--- 5/8

(498)

20--- 5/8

(600)

20

(508)

22--- 1/4

(565)

19--- 5/8

(498)

20--- 5/8

(600)

20

(508)

22--- 1/4

(565)

19--- 5/8

(498)

20--- 5/8

(600)

20

(508)

22--- 1/4

(565)

19--- 5/8

(498)

20--- 5/8

(600)

20

(508)

312AAV

UPFLOW DOWNFLOW HORIZONTAL

120°

MIN

90°

YES

YES

NO

YES

120°

MIN

YES

Fig. 14 -- Duct Flanges

13

NO

120°

MIN

90°

YES

YES

NO

A02020

1

/

4 " (6mm) THREADED ROD

4 REQ.

OUTER DOOR
A S SEMBLY

SECURE ANGLE

312AAV

8" (203mm)
FOR DOOR REMOVAL

MIN

1” (25mm) SQUARE, 1-1/4”x1-1/4”x1/8” (32x32x3mm)
ANGLE IRON OR UNI-STRUT MAY BE USED

IRON TO BOTTOM
OF FURNACE WITH

3

/4" (19mm) SCREWS

3 #8 x
TYPICAL FOR 2 SUPPORTS

(2) HEX NUTS, (2) WASHERS & (2) LOCK WASHERS
REQ. PER ROD

Fig. 15 -- Horizontal Unit Suspension

METHOD 2
USE (4) #8 x 3/4 (19 mm) SHEET
METAL SCREWS FOR EACH
STRAP. THE STRAPS
SHOULD BE VERTICAL
AGAINST THE FURNACE
SIDES AND NOT PULL AWAY
FROM THE FURNACE
SIDES.

A10130

METHOD 1
FOLD ALL STRAPS UNDER
FURNACE AND SECURE WTH
(4) #8 x 3/4 (19 mm) SHEET METAL SCREWS
(2 SCREWS IN SIDE AND 2 SCREWS
IN BOTTOM).

Fig. 16 -- Horizontal Suspension with Straps

14

A10131

LINE CONT A CT ONL Y PERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE T OP AND TW O SIDES OF THE FURNA CE
JA CKET AND BUILDING JOISTS ,
STUDS , OR FRAMING.

EQUIPMENT MANU AL

SHUT -OFF GAS VA LV E

SEDIMENT

TRAP

UNION

SHEET
MET AL

GAS
ENTR Y

17 3 / 4 ″

22

(559mm)

″

(451mm)

6 ″

M IN

TYPE-B
VENT

(152mm)

*

Fig. 17 -- Typical Attic Installation

17 3 / 4 ″
4 3 / 4 ″
1 ″

(25mm)

EXTEND OUT 12 ″
FR OM FA CE OF DOOR

30-IN . (762mm)
MIN WORK AREA

(451mm)

(121mm)

* WHEN USED W ITH
SINGLE W ALL VEN T
CONNECTIONS

OVERALL

UNDER DOOR

UNDER FURNACE

(305mm)

312AAV

A10164

Not all horizontal furnaces are approved for side return air
connections. (See Fig. 20.)

FILTER

ARRANGEMENT

!

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal
injury, or death.

Never operate a furnace without a filter or with filter access
door removed.

There are no provisions for an internal filter rack in these
furnaces. A field--supplied, accessory external filter rack is
required.

Refer to the instructions supplied with the external filter rack for
assembly and installation options.

DUCTS

AIR
General Requir

ements

The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA)
or American Society of Heating, Refrigerating and Air
Conditioning Engineers (ASHRAE) or consult The Air Systems
Design Guidelines reference tables available from your local
distributor. The duct system should be sized to handle the
required system design CFM at the design external static pressure.
The furnace airflow rates are provided in Table 5--Air Delivery
CFM (With Filter).

When a furnace is installed so that the supply ducts carry air
circulated by the furnace to areas outside the space containing the
furnace, the return air shall also be handled by duct(s) sealed to
the furnace casing and terminating outside the space containing
the furnace.

Secure ductwork with proper fasteners for type of ductwork used.
Seal supply-- and return--duct connections to furnace with code
approved tape or duct sealer.

NOTE: Flexible connections should be used between ductwork
and furnace to prevent transmission of vibration.

Ductwork passing through unconditioned space should be
insulated to enhance system performance. When air conditioning
is used, a vapor barrier is recommended.

Maintain a 1--in. (25 mm) clearance from combustible materials
to supply air ductwork for a distance of 36 in. (914 mm)
horizontally from the furnace. See NFPA 90B or local code for
further requirements.

Ductwork Acoustical Tr

eatment

NOTE: Metal duct systems that do not have a 90_ elbow and 10

ft. (3 M) of main duct to the first branch take--off may require
internal acoustical lining. As an alternative, fibrous ductwork may
be used if constructed and installed in accordance with the latest
edition of SMACNA construction standard on fibrous glass
ducts. Both acoustical lining and fibrous ductwork shall comply
with NFPA 90B as tested by UL Standard 181 for Class 1 Rigid
air ducts.

Supply Air

Connections

For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable access panel. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger can be viewed for possible
openings using light assistance or a probe can be inserted for
sampling the air stream. The cover attachment shall prevent leaks.

Upflow and Horizontal

Furnaces

Connect supply--air duct to flanges on furnace supply--air outlet.
Bend flange upward to 90_ with wide duct pliers. (See Fig. 14.)
The supply--air duct must be connected to ONLY the furnace
supply--outlet--air duct flanges or air conditioning coil casing
(when used). DO NOT cut main furnace casing side to attach
supply air duct, humidifier, or other accessories. All accessories
MUST be connected to duct external to furnace main casing.

NOTE: For horizontal applications, the top--most flange may be
bent past 90_ to allow the evaporator coil to hang on the flange
temporarily while the remaining attachment and sealing of the
coil are performed.

15

Table 5 – Air Delivery -- CFM (With Filter)*

FURNACE

SIZE

045--- 08 /

024045

045--- 12/

036045

070--- 081 /

024070

070--- 12/

036070

312AAV

070--- 16/

048070

090--- 14/

042090

090--- 16/

048090

090--- 20/

060090

110--- 12/

036110

110--- 16/

048110

110--- 22/

066110

*A filter is r equired for each return --- air inlet. Airflow performance included 3/4 - --in. (19 mm) washable filter media such as contained in factory ---authorized ac­cessory filter rack. To determine airflow performance without this filter, assume an additional 0.1 In. W.C. available external static pressure.

------ Indicates unstable operating conditions.

RETURN---AIR

INLET

Bottom or

Side(s)

Bottom or

Side(s)

Bottom or

Side(s)

Bottom or

Side(s)

Bottom or

Side(s)

Bottom or

Side(s)

Bottom or

Side(s)

Bottom Only

Both Side or 1
Side & Bottom

1Side Only

Bottom or

Side(s)

Bottom or

Side(s)

Bottom Only

Bottom Sides or
1 Side & Bottom

1Side Only

SPEED

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

Medium

M e d --- L o w

Low

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

Medium

M e d --- L o w

Low

High

M e d --- H i g h

Medium

M e d --- L o w

Low

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

Medium

M e d --- L o w

Low

High

M e d --- H i g h

Medium

M e d --- L o w

Low

High

M e d --- H i g h

Medium

M e d --- L o w

Low

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

Medium

M e d --- L o w

Low

High

M e d --- H i g h

Medium

M e d --- L o w

Low

High

M e d --- H i g h

High

M e d --- H i g h

Medium

M e d --- L o w

Low

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

1120

930
820

725
1465
1295
1150
1030

860
1140

915

795

690
1440
1180
1015

885

695
1840

1610
1460
1260
1065

1650
1515
1385
1205
2060
1710
1470
1260
1030

2380
2185
1905
1595
1340

2485
2175
1845
1540
1280

2420
2160
1850
1530
1290

1625
1510
1360
1195
2055
1750
1545
1300
1050

2530
2225
1895
1565
1320

--- ---

2205
2485

2155
1830
1520
1275

1075

890
785

690
1400
1260
1120
1010

835
1105

885

770

665
1400
1165
1020

885

700
1790

1575
1430
1240
1040

1600
1485
1360
1180
2000
1695
1475
1365
1025

2295
2115
1865
1565
1310

2415
2130
1815
1515
1250

2345
2110
1815
1490
1250

1575
1470
1335
1180
1990
1725
1525
1290
1045

2460
2190
1885
1555
1295

--- ---

2175
2430

2135
1830
1505
1260

EXTERNAL STATIC PRESSURE (IN. W.C.)

1020

850
750

655
1325
1210
1085

980

810
1055

855

740

630
1355
1150
1010

880

700
1730

1535
1400
1215
1015

1535
1440
1320
1160
1930
1665
1450
1245
1020

2205
2045
1815
1530
1280

2330
2070
1770
1475
1220

2265
2045
1765
1455
1220

1515
1415
1295
1155
1910
1670
1490
1275
1015

2380
2135
1865
1535
1265

2415
2120

2360
2100
1810
1490
1240

960
805
700

605
1250
1155
1040

945

780
1010

825

700

590
1300
1125

990

865

690
1670

1485
1360
1180

985
1465

1380
1260
1120
1835
1585
1390
1225

990
2105

1960
1740
1485
1225

2230
2000
1720
1435
1190

2165
1960
1710
1420
1190

1445
1355
1250
1115
1815
1605
1445
1235

975
2285

2075
1820
1505
1235

2330
2065

2270
2040
1780
1470
1210

895
750
650

555
1175
1090

985

895

745

955

785

655

550
1240
1085

965

845

670
1605

1435
1315
1145

955
1385

1300
1195
1065
1755
1480
1335
1165

940
2005

1875
1670
1430
1170

2135
1930
1655
1385

115
2070

1885
1635
1375

115
1355

1285
1180
1065
1695
1515
1355
1165

935
2200

1995
1770
1465
1205

2235
1975

2175
1970
1730
1430
1180

815
680
585

495
1085
1015

920

835

700

885

725

600

475
1170
1030

925

815

640
1530

1370
1260

110

915
1285

1220
1120
1005
1620
1390
1230
1090

890
1900

1770
1590
1355
1120

2030
1840
1580
1335
1105

1960
1790
1560
1320
1110

1260
1185
1100

980
1575
1400
1260
1085

880
2085

1910
1700
1410
1160

2125
1900

2070
1885
1665
1385
1135

720
600
505
405
980
930
835
765
635

815
655
510
415

1090

970
875
770
600

1450
1305
1205
1040

875

1175
1115
1025

925
1490
1245
1120

995

810
1775

1655
1490
1275
1040

1920
1740
1500
1270
1035

1850
1695
1480
1250
1040

1165
1070

985

860
1425
1255
1135
1005

815
1970

1805
1610
1350
1105

1995
1790

1950
1790
1595
1330
1090

605
500
400
305
860
830
740
685
555

715
530
420
340

1000

890
800
700
540

1370
1230
1130

985
825

1055

990
915

810
1315
1110
1005

880

720
1650

1535
1390
1160

955
1790

1620
1395
1175

945
1720

1570
1380
1160

950

990

890

810

740
1230
1120
1020

895

715
1835

1695
1520
1265
1035

1860
1685

1825
1680
1505
1250
1025

455
345
235

--- --­725
700
620
570
445
545
420
325
245
890
785
700
605
460

1275
1145
1055

915
765

895
830
710
630

1115

955
855
750
615

1510
1400
1245
1055

850

1645
1495
1270
1045

845

1570
1445
1250
1055

835
785

725
670
605

1090

975
880
750
610

1695
1565
1410
1175

950

1735
1580

1685
1560
1395
1165

930

340
195

--- ---

--- --­560
545
510
345
260
390
280

--- ---

--- --­745
645
560
475
345

1170
1055

965
835
695

645
600
565
510
910
775
690
600
500

1335
1240
1110

920
750

1485
1345
1090

915
745

1420
1305
1110

905
740

595
530
475
410
910
785
750
620
515

1545
1430
1290
1050

870

1605
1460

1535
1420
1275
1055

840

16

Table 5 -- Air Delivery -- CFM (With Filter)* (Cont.)

FURNACE

SIZE

135--- 16/

048135

135--- 22/

066135

155--- 20/

060155

*A filter is r equired for each return --- air inlet. Airflow performance included 3/4 - --in. (19 mm) washable filter media such as contained in factory ---authorized ac­cessory filter rack. To determine airflow performance without this filter, assume an additional 0.1 In. W.C. available external static pressure.

------ Indicates unstable operating conditions.

RETURN---AIR

INLET

Bottom

or

Side(s)

Bottom

Only

Bottom Sides

or

1 Side & Bottom

1SideOnly

Bottom Only

Both Sides O r 1

Side & Bottom

1SideOnly

SPEED

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

M e d --- L o w

Low

High

M e d --- H i g h

High

M e d --- H i g h

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

2090
1790
1545
1325
2485
2195
1880
1640

--- --­2180
1880
1640

2320
2125
1845
1640

2465
2115
1800
1570

--- --­2155

--- --­2140

2010
1755
1525
1320
2400
2150
1850
1635

--- --­2145
1850
1635

2250
2065
1825
1620

2430
2105
1790
1565

--- --­2135

--- --­2095

Downflow Furnaces

EXTERNAL STATIC PRESSURE (IN. W.C.)

1930
1705
1500
1295
2310
2090
1820
1615

2385
2060
1820
1615

2155
1995
1765
1580

2375
2075
1770
1550

2375
2095

2260
2040

1835
1640
1450
1265
2215
2000
1780
1585

2305
2010
1780
1585

2055
1910
1710
1540

2305
2030
1735
1525

2285
2040

2180
1975

GAS

1710
1550
1380
1210
2110
1920
1715
1530

2195
1945
1715
1530

1970
1815
1650
1485

2230
1980
1695
1495

2200
1975

2085
1890

PIPING

1590
1465
1315
1150
2000
1825
1635
1465

2085
1865
1635
1465

1855
1710
1570
1410

2110
1910
1640
1445

2105
1895

1975
1810

1470
1360
1215

995
1880
1720

1540
1370

1960
1765
1540
1370

1725
1610
1475
1330

2000
1830
1570
1370

1995
1790

1865
1705

1335
1210
1005

865
1725
1565

1415
1255

1825
1660
1415
1255

1600
1490
1370
1220

1865
1725
1465
1270

1870
1685

1740
1595

1025

945
855

745
1535
1405

1290
1150

1670
1515
1290
1150

1450
1340
1240
1080

1725
1590
1345
1175

1730
1550

1605
1480

835
785
670

540
1355
1255

1160
1040

1465
1325
1160
1040

1280
1175
1100

960
1545

1425
1225
1070

1570
1400

1455
1325

Connect supply--air duct to supply--air outlet on furnace. Bend
flange inward past 90_ with wide duct pliers. (See Fig. 14.) The
supply--air duct must be connected to ONLY the furnace
supplyoutlet or air conditioning coil casing (when used). When
installed on combustible material, supply--air duct must be
connected to ONLY the factory--approved accessory subbase, or
a factory approved air conditioning coil casing. DO NOT cut
main furnace casing to attach supply side air duct, humidifier, or
other accessories. All accessories MUST be connected to duct
external to furnace casing.

Return Air

Connections

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal
injury, death, and/or property damage.

Never purge a gas line into a combustion chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection
of leaks to check all connections.

!

WARNING

312AAV

!

WARNING

FIRE HAZARD

Failure to follow this warning could cause personal injury,
death and/or property damage.

Never connect return--air ducts to the back of the furnace.
Follow instructions below.

Downflow Furnaces

The return--air duct must be connected to return--air opening
(bottom inlet) as shown in Fig. 1. DO NOT cut into casing sides
(left or right). Side opening is permitted for only upflow and most
horizontal furnaces. Bypass humidifier connections should be
made at ductwork or coil casing sides exterior to furnace. (See
Fig. 19.)

Upflow and Horizontal

Furnaces

The return--air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing as shown in Fig. 1. Bypass humidifier may be attached
into unused return air side of the furnace casing. (See Fig. 18 and

20.) Not all horizontal furnaces are approved for side return air
connections. (See Fig. 20.)

!

WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal
injury, death, and/or property damage.

Use proper length of pipe to avoid stress on gas control
manifold and a gas leak.

!

WARNING

FIRE OR EXPLOSION HAZARD

Failure to protect gas valve inlet from water and debris
could result in death, personal injury and/or property
damage.

Gas valve inlet and/or inlet pipe must remain capped until
gas supply line is permanently installed to protect the valve
from moisture and debris. Also, install a sediment trap in the
gas supply piping at the inlet to the gas valve.

17