Bryant 315AAV User Manual
315AAV/JAV
VARIABLE--SPEED, INDUCED--COMBUSTION DELUXE
4--WAY MULTIPOISE GAS FURNACE
Installation, Start--up, Operating and
Service and Maintenance Instructions
Series 150/F
SAFETY CONSIDERATIONS 2........................
INTRODUCTION 4..................................
CODES AND STANDARDS 4..........................
Safety 4...........................................
General Installation 4................................
Combustion and Ventilation Air 4......................
Duct Systems 4.....................................
Acoustical Lining and Fibrous Glass Duct 4...............
Gas Piping and Gas Pipe Pressure Testing 4...............
Electrical Connections 4..............................
Venting 4.........................................
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
PROCEDURE 4.....................................
LOCATION 5.......................................
AIR FOR COMBUSTION AND VENTILATION 8.........
Outdoor Combustion Air Method 9....................
The Standard Method: 9............................
Combination of Indoor and Outdoor Air 10.............
INSTALLATION 10..................................
Bottom Return Air Inlet 10..........................
Side Return Air Inlet 10.............................
Leveling Legs (If Desired) 11........................
Bottom Return Air Inlet 11..........................
Suspended Furnace Support 11.......................
Platform Furnace Support 11.........................
Roll--Out Protection 12.............................
Bottom Return Air Inlet 12..........................
Side Return Air Inlet 12.............................
Filter Arrangement 13..............................
AIR DUCTS 13......................................
General Requirements 13............................
Ductwork Acoustical Treatment 13....................
Supply Air Connections 14..........................
Upflow and Horizontal Furnaces 14...................
Downflow Furnaces 15.............................
Return Air Connections 18..........................
Downflow Furnaces 18.............................
Upflow and Horizontal Furnaces 18...................
GAS PIPING 19.....................................
ELECTRICAL CONNECTION 20.......................
ACCESSORIES 22...................................
VENTING 22.......................................
START--UP, ADJUSTMENT, AND SAFETY CHECK 34.....
General 34........................................
Start--Up Procedures 37..............................
Adjustments 37.....................................
Check Safety Controls 45.............................
Checklist 46.......................................
SERVICE AND MAINTENANCE PROCEDURES 46.......
General 46........................................
Care and Maintenance 47.............................
Sequenceof Operation 52.............................
Wiring Diagram 56..................................
Troubleshooting 56..................................
Accessory List 59...................................
PARTS REPLACEMENT INFORMATION GUIDE 60.......
ISO 9001:2000
REGISTERED
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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.
1
SAFETY CONSIDERATIONS
!
WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK, AND
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in dangerous
operation, personal injury, death, or property damage.
Improper installation, adjustment, alteration, service,
maintenance, or use can 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.
315AAV
FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in unit component
damage.
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.
Installing and servicing heating equipment can be hazardous due
to gas and electrical components. Only trained and qualified
personnel should install, repair, or service heating equipment.
Untrained personnel can perform basic maintenance functions
such as cleaning and replacing air filters. All other operations
must be performed by trained service personnel. When working
on heating equipment, observe precautions in literature, on tags,
and on labels attached to or shipped with furnace and other safety
precautions that may apply.
These instructions cover minimum requirements and conform to
existing national standards and safety codes. In some instances,
these instructions exceed certain local codes and ordinances,
especially those that may not have kept up with changing
residential construction practices. We require these instructions as
a minimum for a safe installation.
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.
Wear safety glasses, protective clothing and work gloves. Have
fire extinguisher available during start--up and adjustment
procedures and service calls.
This is the safety--alert symbol
the furnace 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 a hazard
which could result in personal injury or death. CAUTION is used
!
CAUTION
!
CAUTION
. When you see this symbol on
to identify hazards 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.
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. 1 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 in. (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. CNRV, CNPV, CAP, or CAR or
when Coil Box Part No. KCAKC is used. See Fig. 1 for
clearance to combustible construction information.
2
Fig. 1 -- Clearances to Combustibles
315AAV
A10269
3
INTRODUCTION
The Series 150/F 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
gas. This furnace is not approved for installation in mobile
homes, recreational vehicles, or outdoors.
315AAV
60
80 / 27 C
/ 16 C
only the NFGC, contact the American Gas Association, 400 N.
Capitol Street, N.W., Washington, DC 20001 (www.AGA.org.) .
Combustion and Ventilation
Section 9.3 NFPA 54/ANSI Z223.1--2009, Air for Combustion
and Ventilation .
Systems
Duct
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.
Acoustical Lining and Fibrous Glass
Current edition of SMACNA and NFPA 90B as tested by UL
Standard 181 for Class I Rigid Air Ducts
Gas Piping and Gas Pipe Pressure T
NFPA 54/ANSI Z223.1--2009 ; chapters 5, 6, and 7 and National
Plumbing Codes .
Electrical
National Electrical Code (NEC) ANSI/NFPA70--2008 .
enting
V
NFPA 54/ANSI Z223.1--2009; chapters 12 and 13.
Connections
Air
Duct
esting
A06745
Fig. 2 -- Return Air Temperature
This furnace is designed for minimum continuous return--air
temperature of 60_F(15_C) db or intermittent operation down to
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. 2.)
For accessory installation details, refer to the applicable
instruction literature.
NOTE: Remove all shipping brackets and materials before
operating the furnace.
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:
Safety
NFPA 54/ANSI Z223.1--2009 and the Installation Standards,
Warm Air Heating and Air Conditioning Systems ANSI/NFPA
90B .
General
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
Installation
ELECTROSTATIC DISCHARGE (ESD)
PRECAUTIONS PROCEDURE
!
CAUTION
FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in unit component
damage.
Electrostatic discharge can affect electronic components.
Take precautions 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
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]
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)
7 13/16
[197.8]
14 7/8
[337.3]
(BOTH SIDES)
[25.4]
9 11/16
[245.4]
1 1/4
[31.8]
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 airflow requirements above 1800 CFM, 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 for airflow requirements above 1800 CFM.
11 7/16
[290.7]
A10290
315AAV
Fig. 3 -- Dimensional Drawing
Table 1 – Dimensions -- In. (mm)
A
FURNACE SIZE
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)
090---16/048090 17---1/2 (445) 15---7/8 (403) 11---9/16 (294) 16 (406) 4 (102) 130 (59) 16 (406)
110---20/060110 21 (533) 19 ---3/8 (492) 13 ---5/16 (338) 19 --- 1/2 (495) 4 (102) 155 (70) 20 (508)
135---22/066135 24---1/2 (622) 22---7/8 (581) 15---1/16 (383) 23 (584) 4 (102)† 166 (75) 24 (610)
155---22/066155 24---1/2 (622) 22---7/8 (581) 15---1/16 (383) 23 (584) 4 (102)† 175 (79) 24 (610)
CABINET
WIDTH
B
OUTLET
WIDTH
*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.
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.
C
TOP AND
BOTTOM FLUE
COLLAR
D
BOTTOM
INLET WIDTH
VENT
CONNECTION
SIZE
SHIP WT.
LB (KG)
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.
7. An ESD service kit (available from commercial sources)
mayalsobeusedtopreventESDdamage.
5
ACCESSORY
FILTER MEDIA
CABINET SIZE
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
315AAV
CONDITIONED AIR IS
DISCHARGED DOWNWARD
This furnace must:
S be installed so the electrical components are protected
from water.
S not be installed directly on any combustible material
other than 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.
!
WARNING
CARBON MONOXIDE POISONING / COMPONENT
DAMAGE HAZARD
Failure to follow this warning could result in personal injury
or death and unit component 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.
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
Fig. 4 -- Multipoise Orientations
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
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
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.
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 in.
(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 NFPA 54/ANSI
Z223.1--2009 . (See Fig. 5.)
!
WARNING
THE BLOWER IS
LOCATED TO THE LEFT
OF THE BURNER SECTION,
AND CONDITIONED AIR IS
DISCHARGED TO THE RIGHT.
A02097
6
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.)
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.
!
CAUTION
PERSONAL INJURY AND/OR PROPERTY
DAMAGE HAZARD
Improper use or installation of this furnace may result in
premature furnace component failure. This gas furnace may
be used for heating buildings under construction 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 rollout 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.
315AAV
Fig. 6 -- Prohibit Installation on Back
7
A02054
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 DUCTS 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)
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
315AAV
88,000
NP = Not Permitted
ACH
0.60
0.50
0.40
0.30
0.20
0.10
0.00 NP NP NP NP NP NP NP NP NP
+ 30,000 = (118,000 divided by 2,000) = 59.0 Sq. In. for each of two Horizontal Ducts
Table 3 – Minimum Space Volumes for100% Combustion, Ventilation, and Dilution from Indoors
OTHER THAN FAN-ASSISTED TOTAL
(1,000’S BTUH GAS INPUT RATE)
30 40 50 44 66 88 110 132 154
1,050
(29.7)
1,260
(35.6)
1,575
(44.5)
2,100
(59.4)
3,150
(89.1)
6,300
(178.3)
1,400
(39.6)
1,680
(47.5)
2,100
(59.4)
2,800
(79.2)
4,200
(118.9)
8,400
(237.8)
5,250 (148.6)
1,750
(49.5)
2,100
(59.4)
2,625
(74.3)
3,500
(99.1)
10,500
(297.3)
Space Volume Ft3(M3)
1,100
(31.1)
1,320
(37.3)
1,650
(46.7)
2,200
(62.2)
3,300
(93.4)
6,600
(186.8)
1,650
(46.7)
1,980
(56.0)
2,475
(70.0)
3,300
(93.4)
4,950
(140.1)
9,900
(280.3)
FAN-ASSISTED TOTAL
(1,000’S BTUH GAS INPUT RATE)
2,200
(62.2)
2,640
(74.7)
3,300
(93.4)
4,400
(124.5)
6,600
(186.8)
13,200
(373.7)
2,750
(77.8)
3,300
(93.4)
4,125
(116.8)
5,500
(155.7)
8,250
(233.6)
16,500
(467.2)
3,300
(93.4)
3,960
(112.1)
4,950
(140.1)
6,600
(186.8)
9,900
(280.3)
19,800
(560.6)
Round Duct
Dia.
In. (mm)
3,850
(109.0)
4,620
(130.8)
5,775
(163.5)
7,700
(218.0)
11,550
(327.0)
23,100
(654.1)
AIR FOR COMBUSTION AND
VENTILATION
Provisions for adequate combustion, ventilation, and dilution air
must be provided in accordance with:
S U.S. Installations: Section 9.3 of the NFPA 54/ANSI
Z223.1--2009 , Air for Combustion and Ventilation and
applicable provisions of the local building codes.
!
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,
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 the
Carbon Monoxide Poisoning Hazard warning in the venting
section of these instructions to determine if an adequate
amount ofmake--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.
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
of3in.(76mm)
†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
315AAV
S Spaces having at least 50 cubic feet per 1,000 Btuh
may use the INDOOR COMBUSTION AIR,
STANDARD or KNOWN 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.
g. TWO HORIZONTAL DUCTS require 1 sq. in. (645
sq. mm) of free area per 2,000 Btuh (1,100 mm
of combined input for all gas appliances in the space
per Fig. 7 and Table 2.
h. TWO OPENINGS OR VERTICAL DUCTS require 1
sq. in. (645 sq. mm) of free area per 4,000 Btuh (550
2
/kW) for combined input of all gas appliances in
mm
the space per Fig. 7 and Table 2.
3. ONE OUTDOOR OPENING requires:
a. 1 sq. in. (645 sq. mm) of free area per 3,000 Btuh
(734 mm
ances in the space per Table 2 and
b. Not less than the sum of the areas of all vent connect-
ors in the space.
2
/kW) for combined input of all gas appli-
2
/kW)
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 AirE NFPA & AGA
Standard and Known--Air--Infiltration Rate 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 personal
injury or death.
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
9
Infiltration rates greater than 0.60 ACH shall not be used. The
minimum required volume of the 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.
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:
3
Volume
315AAV
Volume
If: Iother = combined input of all other than fan--assisted
appliancesin Btuh/hr
Ifan = combined input of all fan--assisted appliances in Btuh/hr
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.
Other
2. For fan--assisted appliances such as this furnace:
Fan
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).(SeeFig.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
one or more permanent openings in doors or floors
having free area of at least 2 in.
mm
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.
input rating for all gas appliances in the space.
3. In spaces that use the Indoor Combustion Air Method,
infiltration should be adequate to provide air for combustion, permanent ventilation and dilution of flue gases.
However, in buildings with unusually tight construction,
additional air MUST be provided using the methods describedintheOutdoor Combustion Air Method section.
4. 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
21ft
=
ACH
3
15ft
=
ACH
2
/kW) of the total input rating of all gas appliances
2
/kW) of total input rating of all gas appliances.
I
other
1000 Btu/hr
I
fan
1000 Btu/hr
2
/1,000 Btuh (2,000
2
/1,000 Btuh (4,400
2
/4,000 Btuh of total
2
(0.06 m2). One
A04002
A04003
plates and floors, between wall--ceiling joints, between
wall panels, at penetrations for plumbing, electrical
and gas lines, etc.
Combination of Indoor and Outdoor
1. Indoor openings shall comply with the Indoor Combustion Air Method below and,
2. Outdoor openings shall be located as required in the Outdoor Combustion Air Method mentioned previously and,
3. Outdoor openings shall be sized as follows:
a. Calculate the Ratio of all Indoor Space volume divided
by required volume for Indoor Combustion Air
Method 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
required in Outdoor Combustion Air Method above
multiplied by reduction Factor in b. above. The minimum dimension of air openings shall be not less than
3in.(80mm).
Air
INSTALLATION
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
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
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.
Fig. 9 -- Removing Bottom Closure Panel
NOTE: Side return--air openings can be used in UPFLOW and
most HORIZONTAL configurations. Do not use side return--air
openings in DOWNFLOW configuration.
Leveling Legs (If Desir
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.
Inlet
Inlet
Bottom
Closure Panel
Bottom Filler Panel
A10273
ed)
10
5/
16 ″
(8mm)
(8mm)
5/
16 ″
1 3 / 4 ″
(44mm)
3
/ 4 ″
1
(44mm)
(8mm)
5
/ 16 ″
(8mm)
5/
16 ″
1
(44mm)
3/
4 ″
3/
1
4 ″
A89014
(44mm)
Fig. 10 -- Leveling Legs
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 with
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.
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, or
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. CPVP, CAPMP or
CNPVP 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
!
WARNING
TION
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.
The furnace can be installed horizontally in an attic or crawlspace
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.
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 in. screws into the side and 2
#8 x in. screws 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.
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.
315AAV
11
FURNACE
(OR COIL CASING
WHEN USED)
A
PLENUM
OPENING
B
OPENING
D
FLOOR
C
315AAV
Fig. 11 -- Floor and Plenum Opening Dimensions
Roll--Out Pr
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--in. (305 mm) above the combustible
deck or suspended furnaces closer than 12--in. (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
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 two screws holding bot-
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
side return air inlet(s) are used without a bottom return air inlet.
otection
Inlet
tom filler panel. (See Fig. 9.)
tabs.
Inlet
A96283
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
A96285
Fig. 12 -- Furnace, Plenum, and Subbase Installed on a
Combustible Floor
FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
FLOOR
OPENING
A08556
Fig. 13 -- Furnace, Plenum, and Coil Assembly or Coil Box
Installed on a Combustible Floor
Not all horizontal furnaces are approved for side return air
connections (See Fig. 20.)
12
Table 4 – Opening Dimensions -- In. (mm)
FURNACE
CASING
WIDTH
IN. (mm)
14–3/16
(360)
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)
315AAV
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 degree 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.
13
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.
UPFLOW DOWNFLOW HORIZONTAL
315AAV
90°
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.
Downflow
Furnaces
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 supply
outlet 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.
90°
120°
MIN
YES
YES
NO
YES
120°
MIN
YES
Fig. 14 -- Duct Flanges
NO
120°
MIN
YES
YES
NO
A02020
14
OUTER DOOR
A S SEMBLY
8" (203mm)
FOR DOOR REMOVAL
MIN
1
/
4 " (6mm) THREADED ROD
4 REQ.
SECURE ANGLE
IRON TO BOTTOM
OF FURNACE WITH
3
/4" (19mm) SCREWS
3 #8 x
TYPICAL FOR 2 SUPPORTS
1” (25mm) SQUARE, 1-1/4”x1-1/4”x1/8” (32x32x3mm)
ANGLE IRON OR UNI-STRUT MAY BE USED
315AAV
(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
15
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.
GAS
ENTR Y
6 ″
M IN
TYPE-B
VENT
(152mm)
*
30-IN . (762mm)
MIN WORK AREA
17 3 / 4 ″
(451mm)
4 3 / 4 ″
(121mm)
1 ″
(25mm)
EXTEND OUT 12 ″
OVERALL
UNDER DOOR
UNDER FURNACE
(305mm)
FR OM FA CE OF DOOR
* WHEN USED W ITH
SINGLE W ALL VEN T
CONNECTIONS
(451mm)
SHEET
MET AL
17 3 / 4 ″
22
″
(559mm)
EQUIPMENT MANU AL
SHUT -OFF GAS VA LV E
315AAV
SEDIMENT
TRAP
UNION
A10164
Fig. 17 -- Typical Attic Installation
Fig. 18 -- Upflow Return Air Configurations and Restrictions
16
A02075
Fig. 19 -- Downflow Return Air Configurations and Restrictions
A02163
315AAV
Fig. 20 -- Horizontal Return Air Configurations and Restrictions
17
A02162
Unit Size Operating Mode
070--- 12 AIRFLOW (CFM)
†† Low Heat 735 (615)† 0 ---0.50 735 735 735 735 725
†† 1 --- 1 / 2 --- To n C o o l i n g 525 0 --- 0.50‡ 515 500 500 490 485
†† 2 --- To n A / C C o o l i n g 700 0---0.50‡ 690 680 675 680 675
2 --- 1/ 2 --- To n A / C C o o l i n g 875 0 ---1.0‡ 875 875 875 870 865 855 850 835 825 820
3 --- To n A / C C o o l i n g 1050 0 --- 1.0‡ 1050 1050 1050 1050 1050 1050 1045 1035 1020 1000
3 --- 1/ 2 --- To n A / C C o o l i n g 1225 0 --- 1 . 0 1220 1225 1225 1225 1225 1220 1205 1190 1185 1170
090--- 16
†† 1 --- 1 / 2 --- To n A / C C o o l i n g 525 0 --- 0.50‡ 525 520 525 495 475
†† 2 --- To n A / C C o o l i n g 700 0---0.50‡ 680 680 680 675 670
2 --- 1/ 2 --- To n A / C C o o l i n g 875 0 ---1.0‡ 815 845 845 855 850 850 845 835 820 805
315AAV
3 --- To n A / C C o o l i n g 1050 0 --- 1.0‡ 1005 1005 1015 1035 1040 1040 1035 1030 1025 1010
3 --- 1/ 2 --- To n A / C C o o l i n g 1225 0 --- 1 . 0 1190 1200 1200 1205 1205 1215 1205 1200 1185 1170
4 --- To n A / C C o o l i n g 1400 0 --- 1. 0 1350 1370 1390 1390 1400 1390 1380 1380 1360 1340
110--- 20***
†† 2 --- To n A / C C o o l i n g 700 0---0.50‡ 700 700 700 700 700
†† 2 --- 1 / 2 --- To n A / C C o o l i n g 875 0 --- 0.50‡ 875 875 875 875 875
†† 3 --- To n A / C C o o l i n g 1050 0--- 0.50‡ 1050 1050 1050 1050 1050
3 --- 1/ 2 --- To n A / C C o o l i n g 1225 0 -- -1.0‡ 1225 1225 1225 1225 1225 1225 1225 1225 1225 1225
4 --- To n A / C C o o l i n g 1400 0 --- 1.0‡ 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400
5 --- To n A / C C o o l i n g 1750 0 --- 1.0‡ 1750 1750 1750 1750 1750 1750 1750 1750 1740 1725
6 --- To n A / C C o o l i n g 2100 0 --- 1. 0 2100 2100 2100 2100 2090 2075 2055 2040 2005 1970
135--- 22
†† 2 --- To n A / C C o o l i n g 700 0---0.50‡ 700 700 700 700 665
†† 2 --- 1 / 2 --- To n A / C C o o l i n g 875 0 --- 0.50‡ 870 870 865 865 865
†† 3 --- To n A / C C o o l i n g 1050 0--- 0.50‡ 1010 1030 1050 1050 1050
3 --- 1/ 2 --- To n A / C C o o l i n g 1225 0 -- -1.0‡ 1155 1180 1200 1210 1220 1225 1225 1225 1225 1225
4 --- To n A / C C o o l i n g 1400 0 --- 1.0‡ 1395 1400 1400 1400 1400 1400 1400 1390 1375 1355
5 --- To n A / C C o o l i n g 1750 0 --- 1.0‡ 1740 1750 1750 1750 1735 1740 1735 1730 1715 1700
6 --- To n A / C C o o l i n g 2100 0 --- 1. 0 2075 2085 2090 2100 2100 2100 2090 2080 2055 2025
155--- 22
†† 2 --- To n A / C C o o l i n g 700 0---0.50‡ 700 700 700 700 680
†† 2 --- 1 / 2 --- To n A / C C o o l i n g 875 0 --- 0.50‡ 865 875 875 865 865
†† 3 --- To n A / C C o o l i n g 1050 0--- 0.50‡ 1015 1020 1035 1045 1050
3 --- 1/ 2 --- To n A / C C o o l i n g 1225 0 -- -1.0‡ 1160 1185 1215 1225 1225 1225 1225 1225 1225 1225
4 --- To n A / C C o o l i n g 1400 0 --- 1.0‡ 1385 1400 1400 1400 1400 1400 1395 1395 1380 1360
5 --- To n A / C C o o l i n g 1750 0 --- 1.0‡ 1745 1750 1750 1750 1745 1740 1745 1745 1740 1735
6 --- To n A / C C o o l i n g 2100 0 --- 1. 0 2055 2070 2080 2085 2095 2100 2100 2100 2090 2065
Table 5 – Air Delivery -- CFM (With Filter)*
External
Static
Pressure
Range*
(In. W.C.)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
0 --- 1. 0 1160 1165 1175 1180 1180 1180 1180 1180 1180 1175
High Heat
CFM
Airflow
Setting
1180
(1060)†
Maximum 1400 0 --- 1. 0 1395 1400 1400 1400 1395 1385 1370 1340 1300 1245
Low Heat 985 (825)† 0 --- 1. 0 950 970 985 985 985 985 985 985 985 980
High Heat
1210
(1090)†
0 --- 1. 0 1190 1205 1210 1210 1210 1210 1210 1210 1210 1200
Maximum 1600 0 --- 1. 0 1595 1600 1600 1600 1595 1555 1505 1465 1430 1390
Low Heat
High Heat
1320
(1110)†
1475
(1330)†
0 --- 1. 0 1275 1295 1315 1320 1320 1320 1320 1320 1320 1315
0 --- 1. 0 1460 1465 1475 1475 1475 1475 1475 1475 1465 1465
Maximum 2200 0 --- 1. 0 2200 2190 2190 2180 2155 2145 2125 2100 2080 2020
Low Heat
High Heat
1700
(1430)†
1915
(1725)†
0 --- 1. 0 1700 1700 1700 1700 1700 1695 1700 1695 1685 1670
0 --- 1. 0 1900 1905 1915 1915 1915 1915 1915 1915 1915 1915
Maximum 2200 0 --- 1. 0 2180 2195 2200 2200 2200 2200 2185 2165 2140 2095
Low Heat
High Heat
1715
(1440)†
1970
(1775)†
0 --- 1. 0 1715 1715 1715 1715 1715 1705 1710 1705 1705 1695
0 --- 1. 0 1955 1965 1965 1970 1970 1970 1970 1970 1970 1960
Maximum 2200 0 --- 1. 0 2175 2190 2200 2200 2200 2200 2200 2200 2180 2160
External Static Pressure (ESP) (IN. W.C.)
*Actual external static pressure (ESP) can be determined by using the fan laws (CFM 2 proportional to ESP); such as, a system with 1180 CFM
at 0.5 ESP would operate at cooling airflow of 1050 CFM at 0.4 ESP and low--- heating airflow of 735 CFM at 0.19 ESP.
{Comfort airflow values are shown in parenthesis. Comfort airflow is selected when the low --- heat rise adjustment switch (SW1 --- 3) is OFF and
the comfort/efficiency switch (SW1---4) is ON.
}Ductwork must be sized for high---heating CFM within the operational range of ESP.
{{Operation within the blank areas of the chart is not recommended because high ---heat operation will be above 1.0 ESP.
***All airflow on 110 size furnace are 5% less on side return only installations.
18
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