Bryant 912SC Operation manual

1
912SC 92.1 AFUE
LEGACYtLINE SINGLE--STAGE
4--WAY MULTIPOISE
CONDENSING GAS FURNACE, SERIES A
Product Data
A11264
The 912S Multipoise Condensing Gas Furnace is part of the
LegacytLine product offering. Sporting a PSC blower motor
and an Annual Fuel Utilization Efficiency (AFUE) of 92.1%, this
single-stage gas furnace provides efficient comfort for
homeowners. This Legacy Line Gas Furnace also features 4-way
multipoise installation flexibility, and is available in eight model
sizes. The 912S can be vented for direct vent/two-pipe, ventilated
combustion air, or single-pipe applications. A BryantRAir
Conditioner or Heat Pump can be used to form a complete system.
All units meet California Air Quality Management District
emission requirements. These furnaces are approved for
Manufactured Housing (Mobile Home) applications. All sizes are
design certified in Canada.
STANDARD FEATURES
S4-way multipoise design for upflow, downflow or horizontal
installation.
SOptional through-the-cabinet downflow venting.
SInstallation flexibility with a 360-degree rotating elbow.
SIdeal condensing furnace height 35” cabinet: short enough for
taller coils, but still allows enough room for service.
SSilicon Nitride Perfect LighttHot Surface Igniter.
SAluminized-steel primary heat exchanger.
SStainless-steel condensing secondary heat exchanger.
SHigh-quality corrosion-resistant prepainted steel cabinet with
hemmed edges for safety.
SFactory-configured ready for upflow applications.
SDirect-vent/sealed combustion, single-pipe venting or ventilated
combustion air.
SPSC blower motor, single-speed inducer motor, and single-stage
gas valve.
SSelf-diagnostics
SApproved for Twinning applications (36060 through 60120
sizes, only).
SPropane convertible (See accessory list).
SApproved for Manufactured Housing/Mobile Home applications
with MH accessory kit.
SConvenient Air Purifier and Humidifier electrical connections.
SResidential installations may be eligible for consumer financing
through the Retail Credit Program.
SCertified to leak 2% or less of nominal air conditioning CFM
delivered when pressurized to 1-inch water column with all
present air inlets, air outlets, and condensate drain port(s) are
sealed.
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.
CERTIFIED

2
SAP ORDERING NO.
CASING
DIMENSIONS
(IN.)
RATED
HEATING
OUTPUT†
HEATING
AIRFLOW COOLING CFM @ 0.5 ESP
(in. W.C.)
MOTOR HP -
SPEED TAPS
H D W (BTUH) AFUE CFM‡
Heating
ESP
(in. W.C.)
912SC30040S14 35 29.5 14.2 37,000 92.1% 910 0.10 595---970 1/3 - 4
912SC36040S17 35 29.5 17.5 37,000 92.1% 980 0.10 655---1140 1/2 - 5
912SC36060S14 35 29.5 14.2 56,000 92.1% 910 0.12 645---1155 1/3 - 4
912SC48060S17 35 29.5 17.5 56,000 92.1% 980 0.12 985---1505 1/2 - 4
912SC48080S17 35 29.5 17.5 75,000 92.1% 1030 0.15 760 ---1555 1/2 - 5
912SC60080S21 35 29.5 21.0 75,000 92.1% 1115 0.15 865 ---1885 3/4 - 5
912SC48100S21 35 29.5 21.0 93,000 92.1% 1490 0.20 890 ---1490 1/2 - 4
912SC60100S21 35 29.5 21.0 93,000 92.1% 1550 0.20 1475 ---1970 3/4 - 4
912SC60120S24 35 29.5 24.5 112,000 92.1% 2070 0.20 1450---2050 3/4 - 4
† Capacity in accordance with DOE test procedures. Ratings are position dependent. See rating plate.
‡Heating CFM at factory default blower motor heating tap settings.
ESP --- External Static Pressure
FEATURES AND BENEFITS
HYBRID HEATRDual Fuel system — This system can provide
more control over your monthly energy bills by automatically
selecting the most economical method of heating. With HYBRID
HEAT, our system automatically switches between the gas furnace
and the single--stage electric heat pump as outside temperatures
change to maintain greater efficiency and comfort than with any
traditional single-source heating system. The heat pump also
delivers high-efficiency cooling in the summer.
Power HeattIgniter — Bryant’s unique SiN igniter is not only
physically robust but it is also electrically robust. It is capable of
running at line voltage and does not require complex voltage
regulators as do other brands. This unique feature further enhances
the gas furnace reliability and continues Bryant’s tradition of
technology leadership and innovation in providing a reliable and
durable product.
Reliable Heat Exchanger Design — The aluminized steel, clam
shell primary heat exchanger was re--engineered to achieve greater
efficiency out of a smaller size. The first two passes of the heat
exchanger are based on the current 80% product, a design with
more than ten years of field-proven performance and success.
These innovations, paired with the continuation of a crimped,
no-weld seam create an efficient, robust design for this essential
component.
The condensing heat exchanger, a stainless steel fin and tube
design, is positioned in the furnace to extract additional heat.
Stainless steel coupling box componentry between heat exchangers
has exceptional corrosion resistance in both natural gas and
propane applications.
4-Way Multipoise Design — One model for all applications –
there is no need to stock special downflow or horizontal models
when one unit will do it all. The new heat exchanger design allows
these units to achieve the certified AFUE in all positions.
Direct or Single-pipe Venting, or Optional Ventilated
Combustion Air — This furnace can be installed as a 2-pipe
(Direct Vent) furnace, in an optional ventilated combustion air
application, or in single-pipe, non-direct vent applications. This
provides added flexibility to meet diverse installation needs.
Sealed Combustion System — This furnace brings in combustion
air from outside the furnace, which results in especially quiet
operation. By sealing the entire combustion vestibule, the entire
furnace can be made quieter, not just the burners.
Monoport Burners — The burners are specially designed and
finely tuned for smooth, quiet combustion and economical
operation.
Bottom Closure — Factory--installed for side return; easily
removable for bottom return. The multi-use bottom closure can
also serve for roll-out protection in horizontal applications, and act
as the bottom closure for the optional return air base accessory.
Blower Access Panel Switch — Automatically shuts off 115-v
power to furnace whenever blower access panel is opened.
Quality Registration — Our furnaces are engineered and
manufactured under an ISO 9001 registered quality system.
Certifications — This furnace is CSA (AGA and CGA) design
certified for use with natural and propane gases. The furnace is
factory--shipped for use with natural gas. A CSA listed gas
conversion kit is required to convert furnace for use with propane
gas. The efficiency is AHRI efficiency rating certified. This furnace
meets California Air Quality Management District emission
requirements.
912SC

3
SPECIFICATIONS
The furnace should be sized to provide 100 percent of the design
heating load requirement plus any margin that occurs because of
furnace model size capacity increments. None of the furnace
model sizes can be used if the heating load is 20,000 BTU or
lower. Use Air Conditioning Contractors of America (Manual J
and S); American Society of Heating, Refrigerating, and
Air-Conditioning Engineers; or other approved engineering
method to calculate heating load estimates and select the furnace.
Excessive oversizing of the furnace may cause the furnace and/or
vent to fail prematurely, customer discomfort and/or vent freezing.
Failure to follow these guidelines is considered faulty installation
and/or misapplication of the furnace; and resulting failure, damage,
or repairs may impact warranty coverage.
Heating Capacity and Efficiency 30040 36040 36060 48060 48080 60080 48100 60100 60120
Input High
Heat (BTUH) 40,000 40,000 60,000 60,000 80,000 80,000 100,000 100,000 120,000
Output High
Heat (BTUH) 37,000 37,000 56,000 56,000 75,000 75,000 93,000 93,000 112,000
Certified Temperature
Rise Range ºF (ºC) High Heat 40 - 70 (22 - 39)
35 - 65
(19 - 36)
40 - 70
(22 - 39)
35 - 65
(19 - 36)
35 - 65
(19 - 36)
35 - 65
(19 - 36)
40 - 70
(22 - 39)
40 - 70
(22 - 39)
45 - 75
(25 - 42)
Airflow Capacity and Blower Data 30040 36040 36060 48060 48080 60080 48100 60100 60120
Rated External Static
Pressure (in. W.C.)
Heating 0.10 0.10 0.12 0.12 0.15 0.15 0.20 0.20 0.20
Cooling 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Airflow Delivery
@ Rated ESP (CFM)
High Heat 910 980 910 980 1030 1115 1480 1550 2070
Cooling 970 1140 1155 1505 1555 1885 1490 1970 2050
Cooling Capacity (tons) 400 CFM/ton 2.5 2.5 2.5 3.5 44.5 3.5 5 5
350 CFM/ton 2.5 3344.5 5.0 4.0 5.5 5.5
Direct-Drive Motor Type Permanent Split Capacitor (PSC)
Direct-Drive Motor HP 0.3 0.5 0.3 0.5 0.5 0.75 0.5 0.75 0.75
Motor Full Load Amps 4.6 6.8 4.6 7.9 7.4 7.9 6.5 11.1 11.1
RPM Range 500 - 1150
Speed Selections 454455444
Blower Wheel Dia x Width in. 11 x 7 11 x 8 11 x 7 11 x 8 11 x 8 11 x 10 11 x 10 11 x 10 11 x 11
Air Filtration System Field Supplied
Filter Used for Certified Watt Data* KGAWF**06UFR
Electrical Data 30040 36040 36060 48060 48080 60080 48100 60100 60120
Input Voltage Volts-Hertz-Phase 115-60-1
Operating Voltage Range Min-Max 104-127
Maximum Input Amps Amps 5.2 7.4 5.3 8.6 8.1 8.6 7.3 11.9 11.9
Unit Ampacity Amps 7.5 10.3 7.6 11.7 11.1 11.7 10.1 15.8 15.8
Minimum Wire Size AWG 14 14 14 14 14 14 14 12 12
Maximum Wire Length
@ Minimum Wire Size
Feet 49 36 48 31 33 31 36 36 36
(M) (14.9) (11.0) (14.6) (9.4) (10.1) (9.4) (11.0) (11.0) (11.0)
Maximum Fuse/Ckt Bkr
(Time-Delay Type Recommen-
ded)
Amps 15 15 15 15 15 15 15 20 20
Transformer Capacity (24vac output) 40 VA
External Control Power
Available
Heating 27.9 VA
Cooling 34.6 VA
Controls 30040 36040 36060 48060 48080 60080 48100 60100 60120
Gas Connection Size 1/2" - NPT
Burners (Monoport) 223344556
Gas Valve (Redundant) Manufacturer White Rodgers
Minimum Inlet Gas pressure (in. W.C.) 4.5
Maximum Inlet Gas pressure (in. W.C.) 13.6
Ignition Device Silicon Nitride
Limit Control 195 180 220 190 185 195 220 220 165
Heating Blower Control (Heating Off-Delay) Adjustable: 90, 120, 150, 180 seconds
Cooling Blower Control (Time Delay Relay) 90 seconds
Communication System none
Thermostat Connections Com24V,R,W,G,Y
Accessory Connections EAC (115vac); HUM (24vac)
* See Accessory List for part numbers available.
912SC

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MODEL NUMBER NOMENCLATURE
98 6TA30 040 V14 A-- A
S - Single Stage
T - Two Stage
M - Modulating
S - Standard
E - Energy Efficient
V - Variable Speed
14 - 14.2”
17 - 17.5”
21 - 21.0”
24 - 24.5”
91 - Legacy
92 - Preferred
98 - Evolution
Voltage
L - Low NOx
1 - 2
Family/Tier
3
Base Eff. Htg. Stages
45
Major Series 6 - 7
Clg. Cap. Htg. Cap.
8 - 10
Motor
11 12 - 13
Width 14
Voltage
15
Features Minor Series
16
Major Series
24 - 800 CFM
30 - 1000 CFM
36 - 1200 CFM
42 - 1400 CFM
48 - 1600 CFM
54 - 1800 CFM
60 - 2000 CFM
66 - 2200 CFM
(@ 0.5” ESP)
040= 40,000 BTU
060= 60,000 BTU
080= 80,000 BTU
100=100,000 BTU
120=120,000 BTU
140=140,000 BTU
Not all familes have these models.
0 - +90 AFUE
2 - +92 AFUE
3 - +93 AFUE
5 - +95 AFUE
6 - +96 AFUE
7 - +97 AFUE
Example of a Model Number
A12374
FURNACE COMPONENTS
RATING PLATE NOT SHOWN
(LOCATED ON BLOWER DOOR)
GAS VALVE
MAIN LIMIT SWITCH
(BEHIND GAS VALVE)
REPRESENTATIVE DRAWING ONLY, SOME MODELS MAY VARY IN APPEARANCE.
ELECTRICAL JUNCTION
BOX (IF REQUIRED,
LOCATION MAY VARY)
MEDIA CABINET
OPERATING INSTRUCTIONS
NOT SHOWN (LOCATED ON
MAIN FURNACE DOOR, SEE
OPERATING INSTRUCTIONS
INSIDE DOOR FIGURE).
FURNACE
CONTROL
BOARD
MANUAL RESET
ROLLOUT SWITCH
FLAME
SENSOR
MANUAL RESET
ROLLOUT SWITCH
GAS BURNER
HOT SURFACE
IGNITER
INDUCER MOTOR
ASSEMBLY
BLOWER AND
MOTOR
CAPACITOR/
POWER CHOKE
(IF USED)
BLOWER DOOR
SAFETY SWITCH
A11408
912SC

5
ACCESSORIES
DESCRIPTION PART NUMBER 30040 36060 36040 48060 48080 60080 48100 60100 60120
Venting Accessories
Vent Kit - Through the Cabinet KGADC0101BVC DDDDDDDDD
Vent Terminal - Concentric - 2” (51 mm) KGAVT0701CVT
See Venting Tables
Vent Terminal - Concentric - 3” (76 mm) KGAVT0801CVT
Vent Terminal Bracket - 2” (51 mm) KGAVT0101BRA
Vent Terminal Bracket - 3” (76 mm) KGAVT0201BRA
Vent Kit --- Rubber Coupling KGAAC0101RVC See Venting Tables
Condensate Drainage Accessories
Freeze Protect Kit - Trap Heater KGAHT0201CFP DDDDDDDDD
CPVC to PVC Drain Adapters - 1/2” CPVC to 3/4” PVC KGAAD0110PVC DDDDDDDDD
Horizontal Trap Grommet - Direct Vent KGACK0101HCK All DV Horizontal
Condensate Neutralizer Kit P908---0001 DDDDDDDDD
External Trap Kit KGAET0201ETK DDDDDDDDD
Ductwork Adapter Accessories
Furnace Base Kit for Combustible Floors KGASB0201ALL DDDDDDDDD
Coil Adapter Kits --- No Offset KGADA0101ALL DDDDDDDDD
Coil Adapter Kits --- Single Offset KGADA0201ALL DDDDDDDDD
Coil Adapter Kits --- Double Offset KGADA0301ALL DDDDDDDDD
Return Air Base (Upflow Applications) 14.0 --- in. wide KGARP0301B14 D D
Return Air Base (Upflow Applications) 17.5 --- in. wide KGARP0301B17 DDD
Return Air Base (Upflow Applications) 21.0 --- in. wide KGARP0301B21 D D D
Return Air Base (Upflow Applications) 24.5 --- in. wide KGARP0301B24 D
IAQ Device Duct Adapters 20.0---in. IAQ to 16 in. Side
Return KGAAD0101MEC 20”x25” IAQ Devices
IAQ Device Duct Adapters 24.0---in. IAQ to 16 in. Side
Return KGAAD0201MEC 24”x25” IAQ Devices
Gas Conversion Accessories
Mobile Home Kit KGBMH0601KIT DDDDDDDDD
Gas Conversion Kit - Nat to LP KGBNP50011SP DDDDDDDDD
Gas Conversion Kit - LP to Nat KGBPN42011SP DDDDDDDDD
GasOrificeKit-#42(NatGas) LH32DB207 DDDDDDDDD
GasOrificeKit-#43(NatGas) LH32DB202 DDDDDDDDD
GasOrificeKit-#44(NatGas) LH32DB200 DDDDDDDDD
GasOrificeKit-#45(NatGas) LH32DB205 DDDDDDDDD
GasOrificeKit-#46(NatGas) LH32DB208 DDDDDDDDD
GasOrificeKit-#47(NatGas) LH32DB078 DDDDDDDDD
GasOrificeKit-#48(NatGas) LH32DB076 DDDDDDDDD
Gas Orifice Kit - #54 (LP) LH32DB203 DDDDDDDDD
Gas Orifice Kit - #55 (LP) LH32DB201 DDDDDDDDD
Gas Orifice Kit - #56 (LP) LH32DB206 DDDDDDDDD
Gas Orifice Kit - 1.25mm (LP) LH32DB209 DDDDDDDDD
Gas Orifice Kit - 1.30mm (LP) LH32DB210 DDDDDDDDD
Control Accessories
Twinning Kit KGATW0701HSI D D D D D D D
IAQ Accessories
Filter Rack --- Side Return for 1” Filters KGAFR0201ALL DDDDDDDDD
Filter Rack --- Bottom Return for 1” Filters --- 14.2” wide KGBFR0401B14 DDD
Filter Rack --- Bottom Return for 1” Filters --- 17.5” wide KGBFR0501B17 D D
Filter Rack --- Bottom Return for 1” Filters --- 21.0” wide KGBFR0601B21 D D D
Filter Rack --- Bottom Return for 1” Filters --- 24.5” wide KGBFR0701B24 D
Filter Pack (6 pack) --- Washable - 16x25x1 KGAWF1306UFR DDDDDDDDD
Filter Pack (6 pack) --- Washable - 24x25x1 KGAWF1506UFR DDDDDDDDD
EZ-Flex Filter - 16” (406 mm) EXPXXFIL0016 Use with EZXCAB ---1016
EZ-Flex Filter - 20” (508 mm) EXPXXFIL0020 Use with EZXCAB ---1020
EZ-Flex Filter - 24” (610 mm) EXPXXFIL0024 Use with EZXCAB ---1024
EZ-Flex Filter with End Caps - 16” (406 mm) EXPXXUNV0016 Use with EZXCAB---1016
EZ-Flex Filter with End Caps - 20” (508 mm) EXPXXUNV0020 Use with EZXCAB---1020
EZ-Flex Filter with End Caps - 24” (610 mm) EXPXXUNV0024 Use with EZXCAB---1024
Cartridge Media Filter - 16” (406 mm) FILXXCAR0016 Use with FILCABXL---1016
Cartridge Media Filter - 20” (508 mm) FILXXCAR0020 Use with FILCABXL---1020
Cartridge Media Filter - 24” (610 mm) FILXXCAR0024 Use with FILCABXL---1024
EZ Flex Cabinet Side or Bottom Return 4” Filters --- 16” EZXCABCC0016 DDDDD
EZ Flex Cabinet Side or Bottom Return 4” Filters --- 20” EZXCABCC0020 D D D
EZ Flex Cabinet Side or Bottom Return 4” Filters --- 24” FILCABXL0024 D
D= Used with the model furnace
912SC

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AIR DELIVERY -- CFM (BOTTOM RETURN WITH FILTER)
Furnace Return Air
Connection
Wire Lead
Color
Cooling
Ton s
CFM /
Ton
Test Airflow Delivery @ Various External Static Pressures
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
030040 SIDE/BOTTOM
Black 2.5 388 1145 1100 1060 1015 970 920 860 785 680 615
Blue 2.0 413 970 940 905 870 825 775 730 675 570 505
Yellow 2.0 385 910 880 845 810 770 725 675 600 535 475
Red 1.5 397 725 695 665 635 595 555 510 460 390 340
036060 SIDE/BOTTOM
Black 3.0 385 1215 1205 1205 1195 1155 1100 1045 975 910 805
Blue 2.5 370 980 985 980 955 925 880 835 780 695 585
Yellow 2.0 425 910 920 905 880 850 815 765 695 630 545
Red 31.5 430 750 730 705 680 645 605 555 490 435 370
036040 SIDE/BOTTOM
Black 3.0 380 1365 1310 1255 1200 1140 1080 1015 950 860 795
Yellow 2.5 418 1245 1200 1150 1100 1045 990 930 855 790 730
Orange 2.5 366 1050 1025 985 950 915 870 820 760 705 655
Blue 2.0 435 980 955 935 905 870 830 780 725 675 625
Red 1.5 437 720 705 690 675 655 625 590 555 525 485
048060 SIDE/BOTTOM
Black 4.0 376 1600 1545 1505 1475 1505 1445 1400 1330 1235 1140
Yellow 3.5 377 1380 1340 1335 1330 1320 1285 1225 1155 1085 1000
Blue 33.0 387 1190 1185 1195 1195 1160 1125 1075 1015 950 885
Red 32.5 394 1030 1025 1030 1010 985 940 905 855 805 735
048080 SIDE/BOTTOM
Black 4.0 389 1650 1620 1640 1605 1555 1495 1425 1345 1255 1165
Yellow 3.5 381 1420 1425 1400 1370 1335 1290 1230 1170 1095 1015
Orange 3.0 383 1205 1205 1185 1165 1150 1100 1055 1000 935 870
Blue 2.5 384 1035 1020 1005 985 960 930 895 845 795 735
Red 2.0 380 850 825 805 785 760 725 695 655 600 545
060080 BOTTOM or
TWO-SIDES 4, 5
Black 5.0 377 2225 2160 2070 1980 1885 1790 1690 1575 1460 1345
Yellow 4.0 386 1690 1665 1640 1595 1545 1485 1410 1330 1235 1135
Orange 3.5 397 1485 1470 1455 1430 1390 1340 1280 1205 1120 1035
Blue 32.5 426 1120 1110 1100 1090 1065 1035 990 935 870 805
Red 32.0 433 940 920 910 890 865 830 790 745 690 625
048100 SIDE/BOTTOM
Black 4.0 373 1715 1660 1610 1555 1490 1420 1340 1245 1150 1065
Yellow 33.5 379 1535 1480 1435 1380 1325 1260 1180 1095 1010 910
Blue 33.0 367 1300 1255 1205 1160 1100 1035 970 905 810 730
Red 32.0 445 1110 1055 1005 955 890 835 770 690 610 535
060100 BOTTOM or
TWO-SIDES 4, 5
Black 5.0 394 2270 2205 2130 2055 1970 1880 1780 1670 1555 1425
Yellow 5.0 367 2090 2040 1980 1910 1835 1755 1670 1570 1460 1340
Blue 4.0 416 1850 1815 1775 1725 1665 1600 1525 1435 1335 1225
Red 3.5 421 1580 1550 1540 1515 1475 1420 1355 1280 1190 1100
060120 BOTTOM or
TWO-SIDES 4, 5
Black 5.0 410 2385 2310 2230 2150 2050 1920 1780 1650 1540 1415
Yellow 5.0 369 2130 2070 2010 1940 1845 1740 1630 1525 1420 1305
Blue 4.0 416 1875 1840 1795 1735 1665 1580 1495 1410 1310 1205
Red 33.5 414 1610 1585 1555 1515 1450 1395 1325 1250 1160 1080
NOTE:
1. A filter is required for each return ---air inlet. Airflow performance includes a 3/4---in. (19 mm) washable filter media such as contained in a factory ---author-
ized accessory filter rack. See accessory list. To determine airflow performance without this filter, assume an additional 0.1 in. W.C.. available external static
pressure.
2. ADJUST THE BLOWER SPEED TAPS AS NECESSARY FOR THE PROPER AIR TEMPERATURE RISE FOR EACH INSTALLATION.
3. Shaded areas indicate that this airflow range is BELOW THE RANGE ALLOWED FOR HEATING OPERATION.
4. Airflows over 1800 CFM require bottom return, two ---side return, or bottom and side return. A minimum filter size of 20” x 25” (508 x 635 mm) is required.
5. For upflow applications, air entering from one side into both the side of the furnace and a return air base counts as a side and bottom return.
6. All airflows that are shown in BOLD exceed 0.58 watts per CFM at the given external static pressure.
912SC

7
MAXIMUM ALLOWABLE EXPOSED VENT LENGHT INSULATION TABLE
Table 1 – Maximum Allowable Exposed Vent Length in Unconditioned Space -- Ft.
Winter
Design
Temp
°F
Unit Size 40,000* BTUH 60,000 BTUH
Uninsulated 3/8-in. Insulation 1/2-in. Insulation Uninsulated 3/8-in. Insulation 1/2-in. Insulation
Pipe Dia.
in.
1½ 22½ 1½ 22½ 1½ 22½ 1½ 22½ 31½ 22½ 31½ 22½ 3
20 20 20 20 20 50 45 20 60 50 20 30 30 25 20 75 65 60 20 85 75 65
010 5 5 20 25 20 20 30 25 15 15 10 10 20 40 30 25 20 45 40 30
-20 520 15 10 20 20 15 10 520 25 20 15 20 30 25 20
-40 15 10 515 15 10 520 15 15 10 20 20 15 10
Winter
Design
Temp
°F
Unit Size 80,000 BTUH
Uninsulated 3/8-in. Insulation 1/2-in. Insulation
Pipe Dia.
in.
1½ 22½ 3 4 1½ 22½ 3 4 1½ 22½ 3 4
20 15 40 40 35 30 15 50 90 75 65 15 50 70 70 70
015 20 15 10 515 50 45 35 30 15 50 50 40 35
-20 15 10 515 35 30 20 15 15 40 30 25 15
-40 10 515 25 20 15 515 30 25 20 10
Winter
Design
Temp
°F
Unit Size 100,000 BTUH
Uninsulated 3/8-in. Insulation 1/2-in. Insulation
Pipe Dia.
in.
22½ 3 4 2 2½ 342 2½ 3 4
20 20 50 40 35 20 80 95 80 20 80 105 90
020 20 15 10 20 55 45 35 20 65 55 45
-20 15 10 520 35 30 20 20 45 35 25
-40 10 520 25 20 10 20 30 25 15
Winter
Design
Temp
°F
Unit Size 120,000 BTUH 140,000 BTUH
Uninsulated 3/8-in. Insulation 1/2-in. Insulation Uninsulated 3/8-in. Insulation 1/2-in. Insulation
Pipe Dia.
in.
2½ 3 4 2½ 3 4 2½ 3 4 2½ 3 4 2½ 3 4 2½ 3 4
20 10 50 40 10 75 95 10 75 105 555 50 565 105 565 125
010 20 15 10 55 45 10 65 50 525 15 565 50 565 60
-20 10 10 10 35 25 10 45 30 510 5 5 45 30 550 40
-40 10 510 25 15 10 30 20 5 5 5 30 20 535 25
Maximum Allowable Exposed Vent Length in Unconditioned Space -- Meters
Winter
Design
Temp
°C
Unit Size 40,000* BTUH 60,000 BTUH
Uninsulated 3/8-in. Insulation 1/2-in. Insulation Uninsulated 3/8-in. Insulation 1/2-in. Insulation
Pipe Dia.
mm
38 51 64 38 51 64 38 51 64 38 51 64 76 38 51 64 76 38 51 64 76
-7 6.1 6.1 6.1 6.1 15.2 13.7 6.1 18.3 15.2 6.1 9.1 9.1 7.6 6.1 22.9 19.8 18.3 6.1 25.9 22.9 19.8
-18 3.0 1.5 1.5 6.1 7.6 6.1 6.1 9.1 7.6 4.6 4.6 3.0 3.0 6.1 12.2 9.1 7.6 6.1 13.7 12.2 9.1
-29 1.5 6.1 4.6 3.0 6.1 6.1 4.6 3.0 1.5 6.1 7.6 6.1 4.6 6.1 9.1 7.6 6.1
-40 4.6 3.0 1.5 4.6 4.6 3.0 1.5 6.1 4.6 4.6 3.0 6.1 6.1 4.6 3.0
Winter
Design
Temp
°C
Unit Size 80,000 BTUH
Uninsulated 3/8-in. Insulation 1/2-in. Insulation
Pipe Dia.
mm
38 51 64 76 102 38 51 64 76 102 38 51 64 76 102
-7 4.6 12.2 12.2 10.7 9.1 4.6 15.2 27.4 22.9 19.8 4.6 15.2 21.3 21.3 21.3
-18 4.6 6.1 4.6 3.0 1.5 4.6 15.2 13.7 10.7 9.1 4.6 15.2 15.2 12.2 10.7
-29 4.6 3.0 1.5 4.6 10.7 9.1 6.1 4.6 4.6 12.2 9.1 7.6 4.6
-40 3.0 1.5 4.6 7.6 6.1 4.6 1.5 4.6 9.1 7.6 6.1 3.0
Winter
Design
Temp
°C
Unit Size 100,000 BTUH
Uninsulated 3/8-in. Insulation 1/2-in. Insulation
Pipe Dia.
mm
51 64 76 102 51 64 76 102 51 64 76 102
-7 6.1 15.2 12.2 10.7 6.1 24.4 28.9 24.4 6.1 24.4 32.0 27.4
-18 6.1 6.1 4.6 3.0 6.1 16.8 13.7 10.7 6.1 19.8 16.7 13.7
-29 4.6 3.0 1.5 6.1 10.7 9.1 6.1 6.1 13.7 10.7 7.6
-40 3.0 1.5 6.1 7.6 6.1 3.0 6.1 9.1 7.6 4.6
Winter
Design
Temp
°C
Unit Size 120,000 BTUH 140,000 BTUH
Uninsulated 3/8-in. Insulation 1/2-in. Insulation Uninsulated 3/8-in. Insulation 1/2-in. Insulation
Pipe Dia.
mm
64 76 102 64 76 102 64 76 102 64 76 102 64 76 102 64 76 102
-7 3.0 15.2 12.2 3.0 22.9 28.9 3.0 22.9 32.0 1.5 16.7 15.2 1.5 19.8 32.0 1.5 19.8 38.1
-18 3.0 6.1 4.6 3.0 16.8 13.7 3.0 19.8 15.2 1.5 7.6 4.6 1.5 19.8 15.2 1.5 19.8 18.3
-29 3.0 3.0 3.0 10.7 7.6 3.0 13.7 9.1 1.5 3.0 1.5 1.5 13.7 9.1 1.5 15.2 12.2
-40 3.0 1.5 3.0 7.6 4.6 3.0 9.1 6.1 1.5 1.5 1.5 9.1 6.1 1.5 35 7.6
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MAXIMUM EQUIVALENT VENT LENGTH
Table 2 – Maximum Equivalent Vent Length -- Ft.
NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows.
Use Table 3 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
Unit Size
40,000
Outlet choke
required under 10
ft. TEVL
60,000 80,000 100,000 120,000 140,000
Altitude (feet)
Pipe Dia.
(in) 1½ 22½ 1½ 22½ 31½ 22½ 3 4 2 2½ 3 4 2½ 3 4 2½ 3 4
0-2000 20 85 185 20 100 175 200 15 50 130 175 200 20 80 175 200 10 75 185 565 155
2001-3000 15 80 175 95 165 185
10
45 125 165 185 15 75 165 185 70 175
N/A
60 140
3001-4000 70 160
15
90 155 175 115 155 175 155 175 565 165 120
4001-4500
10
65 155 85 150 170 40 110 150 165
10
70 170
N/A
60 160 50 110 4501-5000 60 145 80 165 145 160 65 150 165 45 100
5001-6000 55 130 75 140 155 35 100 135 150 140 155 155 35 80
6001-7000 545 120 10 70 130 145
N/A
30 90 125 140 60 135 145 50 140 30 65
7001-8000 40 110 65 120 135 120 125
N/A
55 125 135 45 130 25 45
8001-9000 N/A 30 95 560 115 125 25 80 110 115 50 115 125 40 120 15 30
9001-10000 25 85 N/A 55 105 115 20 75 100 105 45 100 115 30 115 10 15
Meters
Unit Size
40,000
Outlet choke
required under 10
ft. TEVL
60,000 80,000 100,000 120,000 140,000
Altitude (meters)
Pipe Dia.
(mm) 38 51 64 38 564 76 38 51 64 76 102 51 64 76 102 64 76 102 64 76 102
0-610 626 57 6.5 31 54 61 216 40 54 61 625 54 61 323 57 1.5 21 48
611-914 4.5 24 53 29 51 57
3
15 38 51 57 523 51 57 21 54
N/A
18 42
915-1219 22 49
5
27 48 54 36 48 53 48 54 1.5 20 51 36
1220-1370
3
20 47 26 46 52 13 34 46 51
3
22 52
N/A
19 50 16 33 1371-1524 19 45 24 51 45 50 21 46 51 14 31
1525-1829 17 41 82 43 47 11 31 42 46 43 48 48 11 25
1830-2134 1.5 15 37 322 40 44
N/A
10 27 39 42 19 41 45 16 43 920
2135-2438 12 34 20 37 42 36 39
N/A
18 38 42 14 40 715
2439-2743 N/A 10 30 1.5 19 35 38 826 34 36 15 36 39 13 38 510
2744-3048 826 N/A 17 33 36 724 31 33 14 34 36 12 35 3.5 5
Long Medium Mitered
Concentric
Standard 2-in., 3-in., or
optional 4-in. termination.
ELBOW CONFIGURATIONS VENT TERMINAL CONFIGURATIONS
A13110
Table 3 – Deductions from Maximum Equivalent Vent Length -- Ft. (M)
Pipe Diameter (in): 1-1/2 22-1/2 3 4
Mitered 90º Elbow 8(2.4) 8(2.4) 8(2.4) 8(2.4) 8(2.4)
Medium Radius 90º Elbow 5(1.5) 5(1.5) 5(1.5) 5(1.5) 5(1.5)
Long Radius 90º Elbow 3(0.9) 3(0.9) 3(0.9) 3(0.9) 3(0.9)
Mitered 45º Elbow 4(1.2) 4(1.2) 4(1.2) 4(1.2) 4(1.2)
Medium Radius 45º Elbow 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8)
Long Radius 45º Elbow 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5)
Tee 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9)
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Venting System Length Calculations
The Total Equivalent Vent Length (TEVL) for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent
length of elbows used in the venting system from Table 3.
Standard vent terminations or factory accessory concentric vent terminations count for zero deduction.
See vent system manufacturer’s data for equivalent lengths of flexible vent pipe or other termination systems. DO NOT ASSUME that one
foot of flexible vent pipe equals one foot of straight PVC/ABS DWV vent pipe.
Compare the Total Equivalent Vent Length to the Maximum Equivalent Vent Lengths in Table 2.
Example 1
A direct--vent 60,000 Btuh furnace installed at 2100 ft. (640 M). Venting system includes, FOR EACH PIPE, 100 feet (30 M) of vent pipe,
95 feet (28 M) of combustion air inlet pipe, (3) 90_long radius elbows, (2) 45_long radius elbows and a factory accessory concentric vent
kit.
Can this application use 2--in. (50 mm ND) PVC/ABS DWV vent piping?
Measure the required linear length of air inlet and vent pipe; insert the
longest of the two here: 100 ft Use length of the longer of the vent or air inlet piping system
Add equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
3 x 3ft =9ft. From Table 3
Add equiv length of (2) 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
2 x 1.5 ft =3ft. From Table 3
Add equiv length of vent termination 0ft. From Table 3
Add correction for flexible vent pipe, if any 0ft. From Vent Manufacturer’s instructions;
zero for PVC/ABS DWV
Total Equivalent Vent Length (TEVL) 112 ft. Add all of the above lines
Maximum Equivalent Vent Length (MEVL) 127 ft. For 2” pipe from Table 2
Is TEVL less than MEVL? YES Therefore, 2” pipe may be used
Example 2
A direct--vent 60,000 Btuh furnace installed at 2100 ft. (640 M) Venting system includes, FOR EACH PIPE, 100 feet (30 M) of vent pipe,
95 feet (28 M) of combustion air inlet pipe, (3) 90_long radius elbows, and a polypropylene concentric vent kit. Also includes 20 feet (6 M)
of flexible polypropylene vent pipe, included within the 100 feet (30 M) of vent pipe.
Assume that one meter of flexible 60 mm or 80 mm polypropylene pipe equals 2 Meters of PVC/ABS pipe. VERIFY FROM VENT
MANUFACTURER’S INSTRUCTIONS.
Can this application use 60 mm (O.D.) polypropylene vent piping? If not what size piping can be used?
Measure the required linear length of air inlet and vent pipe; insert the
longest of the two here: 100 ft Use length of the longer of the vent or air inlet piping system
Add equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
3 x 3ft =9ft. From Vent Manufacturer’s instructions
Add equiv length of (2) 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
0 x = 0ft. From Vent Manufacturer’s instructions
Add equiv length of vent termination 9M x3ft/M =18 ft. From Vent Manufacturer’s instructions
Add correction for flexible vent pipe, if any 1.8 x20 ft =36 ft. From Vent Manufacturer’s instructions
Total Equivalent Vent Length (TEVL) 163 ft. Add all of the above lines
Maximum Equivalent Vent Length (MEVL) 127 ft. For 2” pipe from Table 2
Is TEVL less than MEVL? NO Therefore, 60mm pipe may NOT be used;
try 80 mm
Maximum Equivalent Vent Length (MEVL) 250 ft. For 3” pipe from Table 2
Is TEVL less than MEVL? YES Therefore, 80 mm pipe may be used
NOTES:
1. Use only the smallest diameter pipe possible for venting. Over ---sizing may cause flame disturbance or excessive vent terminal icing or freeze---up.
2. NA --- Not allowed. Pressure switch will not close, or flame disturbance may result.
3. Total equivalent vent lengths under 10’ for 40,000 BTUH furnaces from 0 to 2000 ft. (0 to 610 M) above sea level require use of an outlet choke plate .
Failure to use an outlet choke when required may result in flame disturbance or flame sense lockout.
4. Not all furnace families include 140,000 BTUH input models.
5. Vent sizing for Canadian installations over 4500 ft (1370 M) above sea level are subject to acceptance by local authorities having jurisdiction.
6. Size both the combustion air and vent pipe independently, then use the larger size for both pipes.
7. Assume the two 45_elbows equal one 90_elbow. Wide radius elbows are desirable and may be required in some cases.
8. Elbow and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
9. The minimum pipe length is 5 ft. (2 M) linear feet (meters) for all applications.
10. Use 3 ---in. (76 mm) diameter vent termination kit for installations requiring 4 ---in. (102 mm) diameter pipe.
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RETURN AIR TEMPERATURE
This furnace is designed for continuous return--air minimum 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 thermometer. Return--air temperature must not exceed 80_F(27_C) db. Failure to follow these
return air limits may affect reliability of heat exchangers, motors and controls.
60
80 / 27˚C
/ 16˚C
SUPPLY AIR
A10490
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
POSITION CLEARANCE
Rear 0(0mm)
Front (Combustion air openings in furnace and in structure) 1in.(25mm)
Required for service** 24 in. (610 mm)*
All Sides of Supply Plenum** 1in.(25mm)
Sides 0(0mm)
Ven t 0(0mm)
Top of Furnace 1in. (25mm)
* Recommended
**Consult your local building codes
COMBUSTION--AIR PIPE FOR NON--DIRECT (1--PIPE) VENT APPLICATION
FIELD-SUPPLIED
2-IN. (51 mm) DIA.
PVC PIPE
FIELD-SUPPLIED
2-IN. (51 mm) DIA.
MITERED RADIUS
PVC 90°ELBOW
12” (300 mm) MINIMUM
A12376
NOTE: See Installation Instructions for specific venting configurations.
912SC