DIRECT-VENT DOWNFLOW
CONDENSING GAS FURNACE
for MANUFACTURED HOUSING
351DAS
Size 080
Series A
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.
The model 351DAS is a unique downflow condensing furnace 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.
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.
Sealed Combustion (Direct-Vent) System —Enclosed burner
assembly isolates operating noise without the expense of
sound deadening devices. The sealed combustion (directvent) 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 exchangers waste up the flue. The weld-free primary heat exchangers are made of aluminized steel for corrosion
resistance.
Flow-Through Secondary Heat Exchangers —Each cell is lami-
nated with our patented Everlastic
resistance to corrosion. This breakthrough in heating technology
helps extend the life of the furnace for years of trouble-free performance.
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-connection of a thermostat, a humidifier, an air cleaner, and air conditioning 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 selftest feature allows for a complete check of the major components 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 combustion. The extracted heat lowers the temperature of the combustion 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.
Fully-Insulated Casing —Foil-faced insulation in the heat ex-
changer section cuts heat loss, and insulation in the blower section reduces noise levels. The casing also has the required
openings for left- or right-side connection of gas, electric, drain,
and vent connections.
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.
Quality Registration —The 351DAS is engineered and manu-
factured under an ISO 9001 registered quality system.
TM
polypropylene for greater
Form No. PDS 351D.80.1
"
16
⁄
11
22
-IN. DIA
2
⁄
1
-IN. DIA
8
⁄
7
ACCESSORY
POWER ENTRY
"
2
⁄
1
"
24
16
⁄
9
TYP
27
"
8
⁄
5
27
"
16
⁄
11
TYP
"
29
16
⁄
13
30
"
8
⁄
5
32
"
16
/
11
-IN. DIA
2
⁄
1
GAS CONN
2-IN. VENT CONN
THERMOSTAT ENTRY
-IN. DIA
8
⁄
7
POWER CONN
TYP
"
4
⁄
1
TYP
33
"
16
⁄
5
"
2-IN.
COMBUSTION
-AIR CONN
2
⁄
1
22
"
4
⁄
"
1
24
16
⁄
26
15
26
TRAP LOCATION
CONDENSATE DRAIN
OUTLET FLANGE
AS SHIPPED
(REMOVE IN FIELD)
"
16
/
13
A98647
in. rectangle.
in. rectangle.
2
4
/
/
1
1
X 19-
X 23-
2
2
X 12-in. rectangle.
/
/
2
1
1
/
1
"
16
⁄
3
24
INLET
E
INLET
"
16
/
11
"
2
⁄
1
30
"
4
⁄
1
-IN. DIA GAS CONN
2
⁄
CONDENSATE DRAIN
TRAP LOCATION
OR ALTERNATE
1
D
OUTLET
"
16
/
13
A
AIRFLOW
DIMENSIONS (In.)
2. For 1200 CFM 20-in. round or 14-
NOTES: Minimum return-air opening at furnace, based on metal
duct. If flex duct is used, see flex duct manufacturer's
3. For 1600 CFM 22-in. round or 14-
recommendation for equivalent diameters:
1. For 800 CFM 16-in. round or 14-
036080 17-1/2 15-7/8 16 172
048080 17-1/2 15-7/8 16 175
UNIT SIZE A D E SHIP. WEIGHT (Lb)
060080 21 19-3/8 19-1/2 197
18
"
2
⁄
1
"
16
28
⁄
15
19"
OUTLET
"
4
⁄
1
26
"
26
16
⁄
5
22
"
16
⁄
11
22
-IN. DIA
2
⁄
1
-IN. DIA
8
⁄
7
2-IN. VENT CONN
THERMOSTAT ENTRY
POWER CONN
2-IN.
-IN. DIA
2
⁄
1
GAS CONN
AIR CONN
COMBUSTION-
"
16
⁄
11
"
8
⁄
7
"
"
8
⁄
16
⁄
5
13
39
—2—
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 w ill result
in equipment or property damage.
MINIMUM INCHES CLEARANCE TO
COMBUSTIBLE CONSTRUCTION
DOWNFLO W POS ITION:
Mimimum front clearance for service 30 inches (762mm).
*
For installation on combustible floors only when installed on special base No. KGASB0201ALL,
†
Coil Assembly, Part No. CD5 or CK5, or Coil Casin g , Part No. KCAKC .
MANUFACTURED MOBILE HOME STANDARDS
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.
This furnace must be installed with a direct vent (combustion air and flue) system, and use a factory
accessory termination kit.
This furnace is approved for
DOWNF LOW installation.
0"
0"
Clearance in inches
B
A
C
LEVEL (0")
1/2" MAX
DOWNFLOW
K
E
D
I
S
TO
FRONT
1"
TOP/PLENUM
E
C
A
N
R
U
F
T
N
O
R
F
F
R
O
N
T
BOTTOM
0"
†
0"
E
D
I
S
S
E
R
V
I
C
E
*
30
3"
MIN
Condensate Trap
on LEFT Side
COLLECTOR BOX
DRAIN TUBE
CONDENSATE TRAP
INDUCER HOUSING
DRAIN TUBE
BURNER ENCLOSURE
PRESSURE REFERENCE
TUBE ASSEMBLY
NOTE:
CONTROLS—THERMOSTATS AND ZONING
THERMOSTAT—NON-PROGRAMMABLE
THERMOSTAT—PROGRAMMABLE
THERMIDISTAT—PROGRAMMABLE THERMOSTAT
—with Humidity Control
TUBE ROUTING
BURNER ENCLOSURE
PRESSURE
REFERENCE TUBE
ASSEMBLY
CAP / PLUG
LOWER CO LLECTOR
BOX PRESSURE TUBE
UPPER COLLECTOR
BOX PRESSURE TUBE
GAS VALVE
1. All tubing must be connected securely and routed to avoid kinks and traps.
COLLECTOR BOX
DRAIN TUBE
INDUCER HOUSING
DRAIN TUBE
DRAIN TUBE
COUPLING
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
For Use with 1-Speed Air Conditioner—TSTATBBPAC01-B
For Use with 2-Speed Air Conditioner—TSTATBBP2S01-B
For Use with 2-Speed Heat Pump—TSTATBBP2S01-B or TSTATBBPDF01-B
For Use with 1-Speed Heat Pump—TSTATBBPDF01-B
TSTATBBPRH01-B
Condensate Trap
on RIGHT Side
CAP / PLUG
LOWER CO LLECTOR BOX
PRESSURE TUBE
UPPER COLLECTOR BOX
PRESSURE TUBE
GAS VALVE
COLLECTOR BOX EXTENSION DRAIN
TUBE
DRAIN TUBES ROUTED IN
FRONT OF GAS VALVE
CONDENSATE TRAP
324997-201 REV. A / LIT
A99001e
—3—
*
SPECIFICATIONS
UNIT SIZE 036080 048080 060080
RATINGS AND PERFORMANCE
Input Btuh *
Output Capacity† ICS Downflow 75,000 75,000 75,000
AFUE%†
Nonweatherized ICS Downflow 90.0 90.0 90.0
Certified Temperature Rise Range °F 40—70 30—60 20—50
Certified External Static Pressure Heating 0.15 0.15 0.15
Cooling 0.50 0.50 0.50
Airflow CFM‡ Heating 1190 1285 1785
ELECTRICAL
Unit Volts—Hertz—Phase 115—60—1
Operating Voltage Range Min—Max **
Maximum Unit Amps 7.6 10.0 14.1
Unit Ampacity†† 10.4 13.4 18.4
Minimum Wire Size 14 14 12
Maximum Wire Length (Ft)‡‡ 36 28 31
Maximum Fuse Size or Ckt Bkr Amps
(Time-Delay Fuse Recommended) 15 15 20
Transformer (24v) 40va
External Control Heating 12va
Power Available Cooling 21va
Air Conditioning Blower Relay Standard
CONTROLS
Limit Control SPST
Heating Blower Control (Off Delay) Factory Set at 135 Sec
Burners (Monoport) 4 4 4
Gas Connection Size 1/2-in. NPT
GAS CONTROLS
Gas Valve (Redundant/Gas Convertible) Manufacturer White-Rodgers
Min Inlet Pressure (In. wc) 4.5 (Natural Gas) 11.0 (Propane)
Max Inlet Pressure (In. wc) 13.6 (Natural and Propane Gases)
Ignition Device Hot Surface
BLOWER DATA
Direct-Drive Motor HP (Permanent Split Capacitor) 1/3 1/2 3/4
Motor Full Load Amps 5.8 7.9 11.1
RPM (Nominal)—Speeds 1075—4
Blower Wheel Diameter x Width (In.) 10 x 7 11 x 8 11 x 10
Filter Size (In.)—Permanent Washable (1) 16 x 25 x 1 (1) 20 x 25 x 1
FACTORY-AUTHORIZED AND LISTED, DEALER-INSTALLED OPTIONS
Cooling 1245 1525 1925
Downflow Base ***
Vent Termination Kit (Bracket Only for 2 Pipes)
Concentric Vent Termination Kit (Single Exit)
Condensate Freeze Protection Kit KGAHT0101CFP
Electronic/Mechanical Air Cleaner Model AIRA or 902B or MACA
Humidifier 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
80,000 80,000 80,000
104—127
KGASB0201ALL
2-in.—KGAVT0101BRA
3-in.—KGAVT0201BRA
2-in.—KGAVT0501CVT
3-in.—KGAVT0601CVT
—4—
*
COMBUSTION-AIR AND VENT PIPING
MAXIMUM ALLOWABLE PIPE LENGTH (FT)
ALTITUDE
ABOVE SEA
LEVEL (FT) UNIT SIZE TERMINATION TYPE
0 to 2000
2001 to 3000
3001 to 4000
4001 to 5000†
5001 to 6000†
6001 to 7000†
7001 to 8000†
8001 to 9000†
9001 to
10,000†
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.
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
036080
048080
060080
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 Pipe or 2-In. Concentric
PIPE DIA
(IN.) *
1-1/2 10 NA NA NA NA NA
2 555035303020
2-1/2 70 70 70 70 70 70
2 494430252515
2-1/2 70 70 70 70 70 70
2 464128232213
2-/12 70 70 70 70 70 70
2 443926212011
2-1/2 70 70 70 70 70 70
2 4136231817 8
2-1/2 70 70 70 70 70 70
2 3833211615 6
2-1/2 70 70 68 67 66 64
2 3631191412NA
2-1/2 66 65 63 62 60 59
2 3328171210NA
2-1/2 62 60 58 56 55 53
2 302514 9 7NA
2-1/2 57 55 53 51 49 47
123456
NUMBER OF 90° ELBOWS
MAXIMUM ALLOWABLE EXPOSED VENT PIPE LENGTH (FT) WITH AND WITHOUT INSULATION
IN WINTER DESIGN TEMPERATURE AMBIENT *
WINTER DESIGN
TEMPERATURE
UNIT SIZE
036080
048080
060080
(°F)
20 2-1/2 70 70
0 2-1/2 47 70
–20 2-1/2 28 70
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.
MAX PIPE
DIAMETER
(IN.)
WITHOUT
INSULATION
WITH 3/8-IN. OR
THICKER INSULATION†
—5—
CONDENSATE TRAP
FURNACE
DOOR
FIELD
DRAIN
CONN
CONDENSATE
TRAP
1
4
26
FURNACE
SIDE
1
1
2
SIDE VIEW FRONT VIEW
(SHOWN ON RIGHT-HAND SIDE. MAY
BE INSTALLED ON LEFT-HAND SIDE.)
®
ama
1
⁄4 OD
COLLECTOR BOX TO
1
2
1
3
4
7
8
4
3
4
1
WIRE TIE
GUIDES
(WHEN USED)
1
8
7
7
8
1
4
2
TRAP RELIEF PORT
1
⁄2 OD
INDUCER HOUSING
DRAIN CONNECTION
5
⁄8 OD
COLLECTOR BOX
DRAIN CONNECTION
SCREW HOLES FOR
DOWNFLOW (OPTIONAL)
1
⁄2-IN. PVC OR CPVC
FRONT VIEW SIDE VIEW
A98648
CANADIAN GAS ASSOCIATION
APPROVED
R
MEETS DOE RESIDENTIAL CONSERVATION SERVICES
PROGRAM STANDARDS.
Before purchasing this appliance, read important
energy cost and efficiency information available
from your retailer.
REGISTERED QUALITY SYSTEM
SM
As an ENERGY STAR
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.
—6—
*
B IN. DIA PVC
VENT/EXHAUST
1
1
/2
*
ACCESSORIES
CONCENTRIC VENT
C IN. DIA
13/16
D
F
E
LOCATING
TAB
LOCATING
TAB
B IN. DIA PVC
A
INTAKE/COMBUSTION AIR
DIMENSIONS (In.)
A97110
PART NO. A *
KGAVT0501CVT 33-3/8 2 3-1/2 16-5/8 6-1/4 5-3/4
KGAVT0601CVT 38-7/8 3 4-1/2 21-1/8 7-3/8 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.
B C D† E F
ACCESSORY DOWNFLOW SUBBASE
1 1/4″ TYP
PLENUM
B
4
3
D
2
1
A
OPENING
1
2
3
4
A88207
FACTORY-SUPPLIED
FIELD-INSTALLED
INSULATION
Disassembled Assembled
FURNACE
CASING
WIDTH FURNACE IN DOWNFLOW APPLICATION
17-1/2
21
Furnace with or without CD5 or CK5 Coil
Assembly or KCAKC Coil Box
Furnace with or without CD5 or CK5 Coil
Assembly or KCAKC Coil Box
The plenum should be constructed 1/4 in. smaller in width and depth than the plenum dimensions shown above.
PLENUM OPENING * FLOOR OPENING HOLE NO.
15-1/8 19 16-3/4 20-3/8 3
18-5/8 19 20-1/4 20-3/8 2
—7—
C
A97427
FOR WIDTH
ADJUSTMENTABCD
UNIT SIZE
036080 Top
048080 Top
060080 Top
*
A filter is required for return-air supply.
RETURN-AIR
SUPPLY SPEED
High
Med-High
Med-Low
Low
High
Med-High
Med-Low
Low
High
Med-High
Med-Low
Low
AIR DELIVERY—CFM (With Filter) *
EXTERNAL STATIC PRESSURE (In. wc)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
1535
1395
1200
1040
1750
1495
1310
1135
2200
2100
1815
1560
1470
1350
1175
1020
1685
1455
1260
1105
2175
2025
1760
1555
1405
1300
1125
990
1635
1405
1225
1075
2085
1945
1720
1515
1330
1225
1065
960
1575
1355
1170
1040
2025
1865
1670
1460
1245
1155
1030
910
1525
1305
1125
995
1925
1785
1620
1435
1160
1080
970
860
1445
1250
1095
995
1820
1700
1550
1390
1065
985
890
785
1380
1185
1040
910
1735
1620
1480
1340
SERVICE TRAINING
935
880
780
680
1310
1120
980
860
1635
1540
1405
1270
Packaged Service Training programs are an excellent way to increase your
knowledge of the equipment discussed in this manual, including:
• Unit Familiarization • Maintenance
• Installation Overview • 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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