DIRECT-VENT DOWNFLOW
CONDENSING GAS FURNACE
for MANUFACTURED HOUSING
351DAS
Size 080
Series A
Flow-Through Secondary Heat Exchangers—Each cell is lami-
nated with our patented EverlasticTM polypropylene for greater
resistance to corrosion. This breakthrough in heating technology
helps extend the life of the furnace for years of trouble-free per-
formance.
Warranty—Limited 20-year Warranty on the heat exchangers
for the original owner in single family residence. Contact your
dealer for details. Two-year limited parts and labor warranty on
entire unit.
Monoport Inshot Burners—Produce precise air-to-gas mixture
which gives a clean burn. The large monoport on the inshot or
injection-type burners seldom, if ever, needs cleaning.
Control Center—The printed-circuit board and all internal wiring
are factory installed. Convenient terminals permit quick-connec-
tion of a thermostat, a humidifier, an air cleaner, and air condi-
tioning control circuits.
As an added feature, the control has a built-in status indicator
and self-test feature. The status indicator flashes to indicate a
problem condition and assists the servicer in diagnosis. The self-
test feature allows for a complete check of the major compo-
nents in only seconds.
Combustion Air and Ventilation—The 351DAS advanced design
allows Schedule 40PVC, PVC-DWV, SDR-21 PVC, SDR-26
PVC (not approved in Canada), ABS-DWV, or ABS-F628
Schedule 40 pipe to bring outdoor air into the furnace for com-
bustion. The extracted heat lowers the temperature of the com-
bustion products to a point (typically below 115°F) that any of the
approved types of pipe can also be used for venting combustion
products outside the structure. The combustion-air and vent
pipes can terminate through a side wall or through the roof when
using 1 of our approved vent termination kits.
Utilizing the extensive resources available to Bryant, a new
standard of excellence has been achieved with the model
351DAS Downflow Furnace for manufactured (mobile) or
modular homes.
Fully-Insulated Casing—Foil-faced insulation in the heat ex-
changer section cuts heat loss, and insulation in the blower sec-
tion reduces noise levels. The casing also has the required
openings for left- or right-side connection of gas, electric, drain,
and vent connections.
The model 351DAS is a unique downflow condensing fur-
nace with features like no other product in its class. The
351DAS builds on the many Bryant successes in the furnace
industry and establishes a new standard for high-efficiency
gas furnaces.
Certifications—The 351DAS units are A.G.A. and C.G.A. design
certified for use with natural and propane gases, as well as
GAMA efficiency rating certified. The furnace is factory-shipped
for use with natural and propane gases. (All parts necessary to
convert the gas valve for propane gas use are shipped with the
furnace.) Model 351DAS is design certified for installation in
manufactured (mobile) homes.
FEATURES
Factory Configuration—Factory configured for downflow ap-
plications in manufactured (mobile) or modular homes.
The model 351DAS is available in 3 heat/airflow combina-
tions.
Quality Registration—The 351DAS is engineered and manu-
factured under an ISO 9001 registered quality system.
Sealed Combustion (Direct-Vent) System—Enclosed burner
assembly isolates operating noise without the expense of
sound deadening devices. The sealed combustion (direct-
vent) system brings outdoor air directly into the combustion
chamber, reducing infiltration of cold air into the structure and
reducing heat loss.
3-Pass Primary Heat Exchangers—This design accelerates
heat transfer and extracts heat that conventional heat ex-
changers waste up the flue. The weld-free primary heat ex-
changers are made of aluminized steel for corrosion
resistance.
Form No. PDS 351D.80.1
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INSTALLATION
This forced air furnace is equipped for use with natural or propane gas at altitudes 0 - 10,000 ft (0 - 3,050m).
This furnace is for indoor installation in a manufactured (mobile) or modular home.
This furnace may be installed on combustible flooring in alcove or closet at minimum clearance from combustible material.
This appliance requires a special venting system. Refer to the installation instructions for parts list and method of installation. This furnace is for use with schedule-40 PVC,
PVC-DWV, or ABS-DWV pipe, and must not be vented in common with other gas-fired appliances. Construction through which vent/air intake pipes may be installed is
maximum 24 inches (600 mm), minimum 3/4 inches (19 mm) thickness (including roofing materials).
Furnace must be installed level, or pitched forward within 1/2 inch of level for proper drainage. Failure will result
in equipment or property damage.
LEVEL (0")
TO
1/2" MAX
FRONT
DOWNFLOW
This furnace is approved for
DOWNFLOW installation.
MINIMUM INCHES CLEARANCE TO
COMBUSTIBLE CONSTRUCTION
1"
DOWNFLOW POSITION:
Mimimum front clearance for service 30 inches (762mm).
*
0"
0"
B
A
E
D
For installation on combustible floors only when installed on special base No. KGASB0201ALL,
Coil Assembly, Part No. CD5 or CK5, or Coil Casing, Part No. KCAKC.
C
†
I
K
S
T
N
O
R
F
MANUFACTURED MOBILE HOME STANDARDS
S
E
R
V
This furnace must be installed in accordance with the manufacturer's instructions and Manufactured
Home Construction and Safety Standard, Title 24 CFR, Part 3280 or, when such standard is not
applicable, the ANSI A225.1, Standard for Manufactured Home Installation (Manufactured Home Sites,
Communities and Set-Ups), or the Mobile Homes Standard CAN/CSA-Z240 MH Series-M86.
I
C
E
E
F
D
*
R
I
S
30
O
N
T
MIN
0"
3"
This furnace must be installed with a direct vent (combustion air and flue) system, and use a factory
accessory termination kit.
0"
†
Clearance in inches
Condensate Trap
on RIGHT Side
Condensate Trap
on LEFT Side
TUBE ROUTING
BURNER ENCLOSURE
PRESSURE
REFERENCE TUBE
ASSEMBLY
CAP / PLUG
CAP / PLUG
LOWER COLLECTOR BOX
PRESSURE TUBE
LOWER COLLECTOR
BOX PRESSURE TUBE
UPPER COLLECTOR
BOX PRESSURE TUBE
UPPER COLLECTOR BOX
PRESSURE TUBE
COLLECTOR BOX
DRAIN TUBE
GAS VALVE
GAS VALVE
COLLECTOR BOX
DRAIN TUBE
CONDENSATE TRAP
COLLECTOR BOX EXTENSION DRAIN
TUBE
INDUCER HOUSING
DRAIN TUBE
DRAIN TUBES ROUTED IN
INDUCER HOUSING
DRAIN TUBE
FRONT OF GAS VALVE
DRAIN TUBE
COUPLING
CONDENSATE TRAP
BURNER ENCLOSURE
PRESSURE REFERENCE
TUBE ASSEMBLY
324997-201 REV. A / LIT
1. All tubing must be connected securely and routed to avoid kinks and traps.
NOTE:
A99001e
CONTROLS—THERMOSTATS AND ZONING
For Use with 1-Speed Air Conditioner—TSTATBBNAC01-B
For Use with 2-Speed Air Conditioner—TSTATBBN2S01-B
For Use with 2-Speed Heat Pump—TSTATBBN2S01-B
THERMOSTAT—NON-PROGRAMMABLE
THERMOSTAT—PROGRAMMABLE
For Use with 1-Speed Air Conditioner—TSTATBBPAC01-B
For Use with 2-Speed Air Conditioner—TSTATBBP2S01-B
For Use with 1-Speed Heat Pump—TSTATBBPDF01-B
For Use with 2-Speed Heat Pump—TSTATBBP2S01-B or TSTATBBPDF01-B
THERMIDISTAT—PROGRAMMABLE THERMOSTAT
—with Humidity Control
TSTATBBPRH01-B
—3—
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SPECIFICATIONS
UNIT SIZE
036080
048080
060080
RATINGS AND PERFORMANCE
Input Btuh*
80,000
80,000
75,000
80,000
75,000
Output Capacity† ICS
AFUE%†
Downflow
75,000
Nonweatherized ICS
Certified Temperature Rise Range °F
Certified External Static Pressure
Downflow
90.0
40—70
0.15
90.0
30—60
0.15
90.0
20—50
0.15
Heating
Cooling
Heating
Cooling
0.50
0.50
0.50
Airflow CFM‡
1190
1245
1285
1525
1785
1925
ELECTRICAL
Unit Volts—Hertz—Phase
Operating Voltage Range Min—Max**
Maximum Unit Amps
115—60—1
104—127
10.0
7.6
10.4
14
14.1
18.4
12
Unit Ampacity††
13.4
Minimum Wire Size
14
Maximum Wire Length (Ft)‡‡
36
28
31
Maximum Fuse Size or Ckt Bkr Amps
(Time-Delay Fuse Recommended)
15
15
40va
20
Transformer (24v)
External Control
Heating
Cooling
12va
Power Available
21va
Air Conditioning Blower Relay
CONTROLS
Standard
Limit Control
SPST
Factory Set at 135 Sec
4
Heating Blower Control (Off Delay)
Burners (Monoport)
4
4
Gas Connection Size
GAS CONTROLS
1/2-in. NPT
Gas Valve (Redundant/Gas Convertible)
Manufacturer
Min Inlet Pressure (In. wc)
Max Inlet Pressure (In. wc)
White-Rodgers
4.5 (Natural Gas) 11.0 (Propane)
13.6 (Natural and Propane Gases)
Hot Surface
Ignition Device
BLOWER DATA
Direct-Drive Motor HP (Permanent Split Capacitor)
Motor Full Load Amps
1/3
5.8
1/2
7.9
3/4
11.1
RPM (Nominal)—Speeds
1075—4
11 x 8
Blower Wheel Diameter x Width (In.)
Filter Size (In.)—Permanent Washable
FACTORY-AUTHORIZED AND LISTED, DEALER-INSTALLED OPTIONS
Downflow Base***
10 x 7
11 x 10
(1) 16 x 25 x 1
(1) 20 x 25 x 1
KGASB0201ALL
2-in.—KGAVT0101BRA
3-in.—KGAVT0201BRA
Vent Termination Kit (Bracket Only for 2 Pipes)
Concentric Vent Termination Kit (Single Exit)
2-in.—KGAVT0501CVT
3-in.—KGAVT0601CVT
Condensate Freeze Protection Kit
Electronic/Mechanical Air Cleaner
Humidifier
KGAHT0101CFP
Model AIRA or 902B or MACA
Model HUM
Heat/Energy Recovery Ventilator
Model VA3B, VB5B, VC5B, or VL3A
*
Gas input ratings are certified for elevations to 2000 ft. For elevations above 2000 ft, reduce ratings 2% for each 1000 ft above sea level. In Canada, derate
the unit 5% from 2000 to 4500 ft above sea level.
†
‡
Capacity and AFUE in accordance with U.S. Government DOE test procedures.
Airflow shown is for top only return-air supply.
** Permissible voltage limits for proper furnace operation.
†† Unit ampacity = 125% of largest component’s full load amps plus 100% of all other potential operating components (EAC, humidifier, etc.).
‡‡ Length shown is measured 1 way along wire path between unit and service panel for maximum 2% voltage drop.
*** Required for installation on combustible floors when no coil box is used, or when any coil box other than a Bryant CD5 or CK5 cased coil is used.
ICS—Isolated Combustion System
—4—
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COMBUSTION-AIR AND VENT PIPING
MAXIMUM ALLOWABLE PIPE LENGTH (FT)
ALTITUDE
ABOVE SEA
LEVEL (FT)
NUMBER OF 90° ELBOWS
PIPE DIA
(IN.)*
UNIT SIZE
TERMINATION TYPE
1
2
3
4
5
6
1-1/2
2
2-1/2
2
10
55
70
49
NA
50
70
44
NA
35
70
30
NA
30
70
25
NA
30
70
25
NA
20
70
15
036080
048080
060080
0 to 2000
2 Pipe or 2-In. Concentric
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
2001 to 3000
3001 to 4000
4001 to 5000†
5001 to 6000†
6001 to 7000†
7001 to 8000†
8001 to 9000†
2 Pipe or 2-In. Concentric
2 Pipe or 2-In. Concentric
2 Pipe or 2-in Concentric
2 Pipe or 2-In. Concentric
2 Pipe or 2-In. Concentric
2 Pipe or 2-In. Concentric
2 Pipe or 2-In. Concentric
2 Pipe or 2-In. Concentric
2-1/2
2
70
46
70
44
70
41
70
38
70
36
66
33
62
30
57
70
41
70
39
70
36
70
33
70
31
65
28
60
25
55
70
28
70
26
70
23
70
21
68
19
63
17
58
14
53
70
23
70
21
70
18
70
16
67
14
62
12
56
9
70
22
70
20
70
17
70
15
66
12
60
10
55
7
70
13
70
11
70
8
2-/12
2
2-1/2
2
2-1/2
2
70
6
2-1/2
2
64
NA
59
NA
53
NA
47
2-1/2
2
2-1/2
2
9001 to
10,000†
2-1/2
51
49
*
†
Disk usage—Unless otherwise specified, use perforated disk assembly (factory-supplied in loose parts bag).
Vent sizing for Canadian installations over 4500 ft (1370m) above sea level are subject to acceptance by the local authorities having jurisdiction.
NA—Not Allowed; pressure switch will not make.
NOTES:
1. Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.
2. Size both the combustion-air and vent pipe independently, then use the larger diameter for both pipes.
3. Assume two 45° elbows equal one 90° elbow. Long radius elbows are desirable and may be required in some cases.
4. Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
5. The minimum pipe length is 5 ft for all applications.
MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH AND WITHOUT INSULATION
IN WINTER DESIGN TEMPERATURE AMBIENT*
WINTER DESIGN
TEMPERATURE
(°F)
MAX PIPE
DIAMETER
(IN.)
WITHOUT
INSULATION
WITH 3/8-IN. OR
THICKER INSULATION†
UNIT SIZE
20
0
2-1/2
2-1/2
2-1/2
70
47
28
70
70
70
036080
048080
060080
–20
* Pipe length (ft) specified for maximum vent pipe lengths located in unconditioned spaces. Vent pipes located in unconditioned space cannot exceed the
total allowable pipe length as specified in Maximum Allowable Pipe Length table.
† Insulation thickness based on R value of 3.5 per in.
—5—
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CONDENSATE TRAP
FURNACE
DOOR
CONDENSATE
TRAP
1⁄4 OD
COLLECTOR BOX TO
TRAP RELIEF PORT
1
FURNACE
SIDE
1
2
1⁄2 OD
INDUCER HOUSING
DRAIN CONNECTION
3
4
5⁄8 OD
COLLECTOR BOX
DRAIN CONNECTION
7
4
8
1
7
8
8
SCREW HOLES FOR
DOWNFLOW (OPTIONAL)
3
1
4
7
WIRE TIE
GUIDES
(WHEN USED)
1
1
FIELD
DRAIN
CONN
26
4
1
1⁄2-IN. PVC OR CPVC
1
2
2
4
SIDE VIEW
FRONT VIEW
FRONT VIEW
SIDE VIEW
(SHOWN ON RIGHT-HAND SIDE. MAY
BE INSTALLED ON LEFT-HAND SIDE.)
A98648
MEETS DOE RESIDENTIAL CONSERVATION SERVICES
PROGRAM STANDARDS.
CANADIAN GAS ASSOCIATION
ama
®
A PPROVED
R
Before purchasing this appliance, read important
energy cost and efficiency information available
from your retailer.
As an ENERGY STARSM Partner, Bryant Heating & Cooling
Systems has determined that this product meets the
ENERGY STAR guidelines for energy efficiency.
These products are engineered and manufactured under an
ISO 9001 registered quality system.
REGISTERED QUALITY SYSTEM
—6—
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ACCESSORIES
CONCENTRIC VENT
B IN. DIA PVC
VENT/EXHAUST
F
E
C IN. DIA
13/16
11/2
D
A
B IN. DIA PVC
INTAKE/COMBUSTION AIR
A97110
DIMENSIONS (In.)
PART NO.
A*
B
2
3
C
D†
E
F
KGAVT0501CVT
KGAVT0601CVT
33-3/8
38-7/8
3-1/2
4-1/2
16-5/8
21-1/8
6-1/4
7-3/8
5-3/4
6-1/2
*Dimension A will change accordingly as dimension D is lengthened or shortened.
†Dimension D may be lengthened to 60 in. maximum. Dimension D may also be shortened by
cutting the pipes provided in the kit to 12 in. minimum.
ACCESSORY DOWNFLOW SUBBASE
LOCATING
TAB
1 1/4″ TYP
PLENUM
OPENING
B
D
4
A
3
2
1
LOCATING
TAB
C
FACTORY-SUPPLIED
1
2
3
4
FIELD-INSTALLED
INSULATION
A88207
A97427
Disassembled
Assembled
FURNACE
CASING
WIDTH
PLENUM OPENING*
FLOOR OPENING
HOLE NO.
FOR WIDTH
ADJUSTMENT
FURNACE IN DOWNFLOW APPLICATION
A
B
C
D
Furnace with or without CD5 or CK5 Coil
Assembly or KCAKC Coil Box
17-1/2
21
15-1/8
19
16-3/4
20-3/8
3
2
Furnace with or without CD5 or CK5 Coil
Assembly or KCAKC Coil Box
18-5/8
19
20-1/4
20-3/8
* The plenum should be constructed 1/4 in. smaller in width and depth than the plenum dimensions shown above.
—7—
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AIR DELIVERY—CFM (With Filter)*
EXTERNAL STATIC PRESSURE (In. wc)
RETURN-AIR
SUPPLY
UNIT SIZE
SPEED
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
High
Med-High
Med-Low
Low
1535
1395
1200
1040
1470
1350
1175
1020
1405
1300
1125
990
1330
1225
1065
960
1245
1155
1030
910
1160
1080
970
1065
985
890
785
935
880
780
680
036080
Top
Top
Top
860
High
Med-High
Med-Low
Low
1750
1495
1310
1135
1685
1455
1260
1105
1635
1405
1225
1075
1575
1355
1170
1040
1525
1305
1125
995
1445
1250
1095
995
1380
1185
1040
910
1310
1120
980
048080
060080
860
High
Med-High
Med-Low
Low
2200
2100
1815
1560
2175
2025
1760
1555
2085
1945
1720
1515
2025
1865
1670
1460
1925
1785
1620
1435
1820
1700
1550
1390
1735
1620
1480
1340
1635
1540
1405
1270
* A filter is required for return-air supply.
SERVICE TRAINING
Packaged Service Training programs are an excellent way to increase your
knowledge of the equipment discussed in this manual, including:
• Unit Familiarization
• Installation Overview
• Maintenance
• Operating Sequence
A large selection of product, theory, and skills programs is available, using popular
video-based formats and materials. All include video and/or slides, plus companion
book.
Classroom Service Training plus "hands-on" the products in our labs can mean
increased confidence that really pays dividends in faster troubleshooting, fewer
callbacks. Course descriptions and schedules are in our catalog.
CALL FOR FREE CATALOG 1-800-962-9212
[ ] Packaged Service Training
[ ] Classroom Service Training
A94328
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
UNIT MUST BE INSTALLED IN ACCORDANCE
WITH INSTALLATION INSTRUCTIONS
Cancels: New
© 1999 Bryant Heating & Cooling Systems, 7310 W. Morris St., Indianapolis, IN 46231
PRINTED IN U.S.A.
Catalog No. 5235-100
1-99
—8—
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