Bryant EVOLUTION 986TA Operation manual

1
986TA
EVOLUTIONRTWO--STAGE
4--WAY MULTIPOISE, VARIABLE SPEED
CONDENSING GAS FURNACE, SERIES A
Product Data
A11264
The 986TA Multipoise Variable--Speed Condensing Gas Furnace is
features the two--stage EvolutionRSystem. The Perfect HeatR
technology two--stage gas valve is at the heart of the comfort
provided by this furnace, along with the variable--speed ECM
blower motor, and two--speed inducer motor. With an Annual Fuel
Utilization Efficiency (AFUE) up to 96.5%, the Evolution
two--stage gas furnace provides exceptional savings as well when
compared to standard gas furnaces. This Evolution Gas Furnace
also features 4--way multipoise installation flexibility, and is
available in five model sizes. The 986TA can be vented for direct
vent/two--pipe, ventilated combustion air, or single--pipe
applications. A Bryant Evolution Control and Evolution Air
Conditioner or Heat Pump, can be used to form a complete
Evolution System. All units meet California Air Quality
Management District emission requirements. All sizes are design
certified in Canada.
STANDARD FEATURES
SEvolutionRSystem; compatible with single--zone Evolution
systems
SEvolution Features—match with the Evolution Control for
Evolution System benefits
SQuiet operation. Compare for yourself at HVACpartners.com
SIdeal height 35” (889 mm) cabinet: short enough for taller coils,
but still allows enough room for service
SSilicon Nitride Perfect Light™Hot Surface Igniter
SSmartEvap™technology helps control humidity levels in the
home when used with a compatible humidity control system
SFanOn Plus™technology allows control of continuous fan speed
from a compatible thermostat
SExternal Media Filter Cabinet included
S4--way multipoise design for upflow, downflow or horizontal
installations, with unique vent elbow and optional through--
the--cabinet downflow venting capability
SVariable--Speed blower motor, two--speed inducer motor, and
two--stage gas valve
SSelf--diagnostics and extended diagnostic data through the
Advanced Product Monitor (APM) accessory or Evolution User
Interface
SAdjustable blower speed for cooling, continuous fan, and
dehumidification
SAluminized--steel primary heat exchanger
SStainless--steel condensing secondary heat exchanger
SPropane convertible (See Accessory list)
SFactory--configured ready for upflow applications
SFully--insulated casing including blower section
SConvenient Electronic Air Cleaner and Humidifier connections
SDirect--vent/sealed combustion, single--pipe venting or
ventilated combustion air
SInstallation flexibility: sidewall or vertical vent
SResidential installations may be eligible for consumer financing
through the Retail Credit Program
LIMITED WARRANTY*
S10 year parts and lifetime heat exchanger limited warranty to the
original purchaser upon timely registration.
SLimited warranty period is five years for parts and twenty years
for the heat exchanger if not registered within 90 days of
installation.{
* For owner occupied, residential applications.
{Jurisdictions where warranty benefits cannot be conditioned on registra-
tion will receive registered limited warranty benefits.
CERTIFIED
Always Ask For
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.

2
SPECIFICATIONS
Heating Capacity and Efficiency 030040 042060 048080 048100 066120
Input High Heat (BTUH) 40,000 60,000 80,000 100,000 120,000
Low Heat (BTUH) 26,000 39,000 52,000 65,000 78,000
Output High Heat (BTUH) 39,000 58,000 78,000 98,000 117,000
Low Heat (BTUH) 25,000 38,000 50,000 63,000 76,000
Efficiency AFUE % (ICS) 96.5 96.3 96.2 96.5 96.5
Certified Temperature
Rise Range ºF (ºC)
High Heat 40 - 70
(21-38)
35 - 65
(19-36)
40 - 70
(21-38)
45 - 75
(25-41)
45 - 75
(25-41)
Low Heat 30 - 60
(17-33)
30 - 60
(17-33)
30 - 60
(17-33)
30 - 60
(17-33)
30 - 60
(17-33)
Airflow Capacity and Blower Data 030040 042060 048080 048100 066120
Certified External Static
Pressure (in. w.c.) Heating 0.10 0.12 0.15 0.20 0.20
Cooling 0.5 0.5 0.5 0.5 0.5
Airflow Delivery
@RatedESP(CFM)
High Heat 815 1135 1510 2035 2375
Low Heat 660 860 860 1530 1675
Cooling 905 1475 1610 1805 2115
Cooling Capacity (tons)
@ 400, 350 CFM/ton
400 CFM/ton 23.5 44.5 5
350 CFM/ton 2.5 44.5 5 6
Direct-Drive Motor Type Electronically Commutated Motor (ECM)
Direct-Drive Motor HP 1/2 3/4 3/4 1 1
Motor Full Load Amps 6.8 8.4 8.4 10.9 10.9
RPM Range 600 - 1200
Speed Selections Variable (PWM)
Blower Wheel Dia x Width in. 11x7 11x8 11x8 11x10 11 x 11
Air Filtration System Factory Supplied Media Cabinet
FieldSuppliedFilter
Filter Used for Certified Watt Data KGAWF1606UFR KGAWF1306UFR KGAWF1406UFR KGAWF1506UFR KGAWF1506UFR
Electrical Data 030040 042060 048080 048100 066120
Input Voltage Volts-Hertz-Phase 115-60-1
Operating Voltage Range Min-Max 104-127
Maximum Input Amps Amps 8.2 9.8 9.8 12.3 12.3
Unit Ampacity Amps 11.0 13.0 13.0 16.1 16.1
Minimum Wire Size AWG 14 14 14 12 12
Maximum Wire Length
@ Minimum Wire Size
Feet 33 28 28 35 35
(M) (10.1) (8.5) (8.5) (10.7) (10.7)
Maximum Fuse/Ckt Bkr
(Time-Delay Type Recommended) Amps 15 15 15 20 20
Transformer Capacity (24vac output) 40 VA
External Control Power
Available
Heating 24.3 VA
Cooling 34.6 VA
Controls 030040 042060 048080 048100 066120
Gas Connection Size 1/2” - NPT
Burners (Monoport) 2 3 4 5 6
Gas Valve (Redundant)
Manufacturer White Rogers™
Minimum Inlet Gas
pressure (in. W.C.) 4.5
Maximum Inlet Gas
pressure (in. W.C.) 13.6
Gas Conversion Kit - Natural to Propane KGANP5201VSP
Gas Conversion Kit - Propane to Natural KGAPN4401VSP
Manufactured (Mobile) Home Kit not approved for MH use
Ignition Device Silicon Nitride
Limit Control 165 180 170 160 160
Heating Blower Control (Heating Off-Delay) Adjustable: 90, 120, 150, 180 seconds
Cooling Blower Control (Time Delay Relay) 90 seconds
Communication System Evolution (non-zoning)
Thermostat Connections W2,Y1,DHUM,G,COM24V,W/W1,Y/Y2,R
Accessory Connections EAC (115vac); HUM (24vac); 1-stg AC (via Y/Y2)

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MODEL NUMBER NOMENCLATURE
98 6TA30 040 V14 A-- A
S - Single Stage
T - Two Stage
M - Modulating
0 --- 90 AFUE
3 --- 93 AFUE
5 --- 95 AFUE
6 --- 96 AFUE
7 --- 97 AFUE
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
Not all familes have these models.
A11163
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

4
ACCESSORIES
DESCRIPTION PART NUMBER 10040 42060 48080 48100 66120
Venting, Drainage and Installation
Vent Kit - Through the Cabinet KGADC0101BVC XXXXX
Vent Terminal - Concentric - 2” (51 mm) KGAVT0701CVT X X X X N/A
Vent Terminal - Concentric - 3” (76 mm) KGAVT0801CVT N/A X X X X
Vent Terminal Bracket - 2” (51 mm) KGAVT0101BRA X X X X N/A
Vent Terminal Bracket - 3” (76 mm) KGAVT0201BRA N/A X X X X
CPVC to PVC Drain Adapters - 1/2” CPVC to 3/4” PVC KGAAD0110PVC XXXXX
Horizontal Trap Grommet - Direct Vent KGACK0101HCK XXXXX
Freeze Protect Kit - Heat Patch for Drain Trap KGAHT0201CFP XXXXX
Freeze Protect Kit - Heat Tape KGAHT0101CFP XXXXX
Furnace Base Kit for Combustible Floors KGASB0201ALL XXXXX
Gas Conversion
GasCnvKit-NattoLP;Var-spdProducts KGANP5201VSP XXXXX
Gas Cnv Kit - LP to Nat; Var-spd Products KGAPN4401VSP XXXXX
GasOrificeKit-#42(NatGas) KGAHA0150N42 XXXXX
GasOrificeKit-#43(NatGas) KGAHA0250N43 XXXXX
GasOrificeKit-#44(NatGas) KGAHA0350N44 XXXXX
GasOrificeKit-#45(NatGas) KGAHA0450N45 XXXXX
GasOrificeKit-#46(NatGas) KGAHA0550N46 XXXXX
GasOrificeKit-#47(NatGas) KGAHA1550N47 XXXXX
GasOrificeKit-#48(NatGas) KGAHA1650N48 XXXXX
Gas Orifice Kit - #54 (LP) KGAHA0650P54 XXXXX
Gas Orifice Kit - #55 (LP) KGAHA0750P55 XXXXX
Gas Orifice Kit - #56 (LP) KGAHA0850P56 XXXXX
Gas Orifice Kit - 1.25mm (LP) KGAHA5750125 XXXXX
Gas Orifice Kit - 1.30mm (LP) KGAHA5750130 XXXXX
Indoor Air Quality
Bryant Perfect Air Purifier - 16x25 (406x635 mm) GAPAAXBB1625-A08 XXXXX
Bryant Perfect Air Purifier - 20x25 (508x635 mm) GAPAAXBB2025-A08 XXXXX
Bryant Perfect Air Purifier Repl. Filter- 16x25 (406x635 mm) GAPABBCAR1625-A05 XXXXX
Bryant Perfect Air Purifier Repl. Filter- 20x25 GAPABBCAR1625-A05 XXXXX
EZ Flex Cabinet 16” (406 mm) EZXCABBB1016-A20 XXXXX
EZ Flex Cabinet 20” (508 mm) EZXCABBB1020-A20 XXXXX
Cartridge Media Filter - 16” (406 mm) FILXXCAR0016 XXXXX
Cartridge Media Filter - 20” (508 mm) FILXXCAR0020 XXXXX
Cartridge Media Filter - 24” (610 mm) FILXXCAR0024 N/A X X X X
EZ-Flex Filter - 16” (406 mm) EXPXXFIL0016 XXXXX
EZ-Flex Filter - 20” (508 mm) EXPXXFIL0020 XXXXX
EZ-Flex Filter - 24” 610 mm) EXPXXFIL0024 N/A X X X X
EZ-Flex Filter with End Caps - 16” (406 mm) EXPXXUNV0016 XXXXX
EZ-Flex Filter with End Caps - 20” (508 mm) EXPXXUNV0020 XXXXX
EZ-Flex Filter with End Caps - 24” (610 mm) EXPXXUNV0024 N/A X X X X
Filter Pack (6 pack) - Washable - 16x25x1 (406x635x25 mm) KGAWF1306UFR XXXXX
Filter Pack (6 pack) - Washable - 24x25x1 (610x635x25 mm) KGAWF1506UFR N/A X X X X
Controls
Evolution™ Control User Interface SYSTXBBUID01-D XXXXX
Service Tools
Advanced Product Monitor - APM KGASD0301APM XXXXX
ECM Motor Simulator Kit KGASD0301FMS XXXXX
X = Used with this model furnace
N/A = Not used with this model furnace

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AIR DELIVERY -- CFM (BOTTOM RETURN WITH FILTER)
(SW1-5 and SW4-3 set to OFF, except as indicated. See Notes 1 and 2.)
INPUT
BTUH
Cooling Switch Settings External Static Pressure (E.S.P.)
SW2-3 SW2-2 SW2-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
40000
OFF OFF OFF 1125 1080 1020 970 905 855 805 755 700 635
OFF OFF ON 615 555 510 475 440 395 355 270 230 note 7
OFF ON OFF 785 740 695 665 630 590 565 520 485 450
OFF ON ON 990 950 910 875 850 815 770 720 670 615
ON OFF OFF 1125 1080 1020 970 905 855 805 755 700 635
ON OFF ON 1125 1080 1020 970 905 855 805 755 700 635
ON ON OFF 1125 1080 1020 970 905 855 805 755 700 635
ON ON ON 1125 1080 1020 970 905 855 805 755 700 635
Maximum Cooling Airflow21125 1080 1020 970 905 855 805 755 700 635
High Heat Airflow3815 770 725 695 660 625 595 550 510 475
Low Heat Airflow3660 605 560 530 495 450 415 340 300 note 7
INPUT
BTUH
Cooling Switch Settings External Static Pressure (E.S.P.)
SW2-3 SW2-2 SW2-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
60000
OFF OFF OFF 1330 1295 1260 1220 1190 1150 1110 1075 1045 1005
OFF OFF ON 725 660 600 520 435
OFF ON OFF 780 725 660 615 540
OFF ON ON 975 925 875 835 785 750 690 655 610 570
ON OFF OFF 1160 1120 1090 1045 1010 970 920 885 840 800
ON OFF ON 1330 1295 1260 1220 1190 1150 1110 1075 1045 1005
ON ON OFF 1705 1650 1595 1545 1475 1415 1340 1275 1200 1105
ON ON ON 1705 1650 1595 1545 1475 1415 1340 1275 1200 1105
Maximum Cooling Airflow21705 1650 1595 1545 1475 1415 1340 1275 1200 1105
High Heat Airflow31145 1105 1075 1030 995 955 905 870 825 785
Low Heat Airflow3870 820 760 720 655 620 560 525 470 435
INPUT
BTUH
Cooling Switch Settings External Static Pressure (E.S.P.)
SW2-3 SW2-2 SW2-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
80000
OFF OFF OFF 1805 1765 1720 1665 1610 1540 1475 1400 1315 1235
OFF OFF ON 775 635 455 230 note 7
OFF ON OFF 840 740 675 625 555
OFF ON ON 995 955 910 860 815 770 720 660 620 585
ON OFF OFF 1175 1140 1090 1060 1025 980 940 905 855 815
ON OFF ON 1325 1280 1245 1210 1180 1140 1105 1070 1025 990
ON ON OFF 1545 1515 1480 1445 1410 1380 1350 1315 1245 1175
ON ON ON 1805 1765 1720 1665 1610 1540 1475 1400 1315 1235
Maximum Cooling Airflow21805 1765 1720 1665 1610 1540 1475 1400 1315 1235
High Heat Airflow31520 1490 1455 1420 1385 1355 1320 1285 1220 1155
Low Heat Airflow31180 1145 1095 1065 1030 985 945 910 860 820

6
AIR DELIVERY -- CFM (BOTTOM RETURN WITH FILTER) (CONTINUED)
(SW1-5 and SW4-3 set to OFF, except as indicated. See Notes 1 and 2.)
INPUT
BTUH
Cooling Switch Settings External Static Pressure (E.S.P.)
SW2-3 SW2-2 SW2-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
100000
OFF OFF OFF 2115 2035 1965 1890 1805 1725 1625 1540 1435 1345
OFF OFF ON 870 715 585 525 450
OFF ON OFF 1025 950 900 835 770
OFF ON ON 1210 1165 1105 1055 1000 950 895 845 800 735
ON OFF OFF 1400 1355 1295 1250 1205 1155 1110 1060 1020 960
ON OFF ON 1615 1570 1525 1485 1435 1395 1345 1310 1260 1210
ON ON OFF 2115 2035 1965 1890 1805 1725 1625 1540 1435 1345
ON ON ON 2115 2035 1965 1890 1805 1725 1625 1540 1435 1345
Maximum Cooling Airflow22115 2035 1965 1890 1805 1725 1625 1540 1435 1345
High Heat Airflow32115 2035 1965 1890 1805 1725 1625 1540 1435 1345
Low Heat Airflow31575 1530 1485 1445 1395 1350 1305 1265 1215 1165
INPUT
BTUH
Cooling Switch Settings External Static Pressure (E.S.P.)
SW2-3 SW2-2 SW2-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
1200006
OFF OFF OFF 2010 1960 1910 1850 1800 1750 1690 1645 1565 1480
OFF OFF ON 1015 805 645 550 480
OFF ON OFF 1075 975 915 835 765
OFF ON ON 1205 1135 1055 1000 935
ON OFF OFF 1400 1330 1260 1190 1145 1080 1035 970 905 845
ON OFF ON 1615 1550 1500 1435 1370 1325 1265 1215 1160 1110
ON ON OFF 2010 1960 1910 1850 1800 1750 1690 1645 1565 1480
ON ON ON note 7 2375 2300 2205 2115 2010 1890 1750 1645 1550
Maximum Cooling Airflow2note 7 2375 2300 2205 2115 2010 1890 1750 1645 1550
High Heat Airflow3note 7 2375 2300 2205 2115 2010 1890 1750 1645 1550
Low Heat Airflow31735 1675 1625 1560 1500 1455 1395 1345 1285 1225
1. Nominal 350 CFM/ton cooling airflow is delivered with SW1-5 and SW4-3 set to OFF.
Set both SW1-5 and SW4-3 to ON for +7% airflow (nominal 370 CFM/ton).
Set SW1-5 to ON and SW4-3 to OFF for +15% airflow (nominal 400 CFM/ton).
Set SW4-3 to ON and SW1-5 to OFF for -7% airflow (nominal 325 CFM/ton).
2. Maximum cooling airflow is achieved when switches SW3-1, SW3-2, SW3-3 and SW1-5 are set to ON, and SW4-3 is set to OFF.
3. All heating CFM's are when low heat rise adjustment switch (SW1-3) and comfort/efficiency adjustment switch (SW1-4) are both set to OFF.
4. Ductwork must be sized for high-heating CFM within the operational range of E.S.P. Operation within the blank areas of the chart is not recommended
because high-heat operation will be above 1.0 E.S.P.
5. All airflows on 21" (533 mm) casing size furnaces are 5% less on side return only installations.
6. Side returns for 24.5" (622 mm) casing sizes require two sides, or side and bottom, to allow sufficient airflow at the return of the furnace.
7. Airflow not stable at this E.S.P.

7
MAXIMUM EQUIVALENT VENT LENGTH -- FT. (M)
NOTE: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations. Use Table 2- Deductions from
Maximum Equivalent Vent Length to determine allowable vent length for each application.
Table 1 – Maximum Equivalent Vent Length -- Ft. (M)
0 to 4500 Ft. (0 to 1370 M) Altitude
Altitude
FT (M)
Unit Size
BTU/Hr DIRECT VENT (2-PIPE) AND NON---DIRECT VENT (1---PIPE)
Vent Pipe Diameter (in.)
1-1/2 22-1/2 3 4
0 to 2000
(0 to 610)
40,000* 50 (15.2) 210 (64.0) 250 (76.2) NA NA
60,000 30 (9.1) 135 (41.1) 235 (71.6) 265 (80.8) NA
80,000 20 (6.1) 70 (21.3) 175 (53.3) 235 (71.6) 265 (80.8)
100,000 NA 25 (7.6) 110 (33.5) 235 (71.6) 265 (80.8)
120,000 NA NA 15 (4.6) 100 (30.5) 250 (76.2)
2001 to 3000
(610 to 914)
40,000* 45 (13.7) 198 (60.4) 232 (70.7) NA NA
60,000 27 (8.2) 127 (38.7) 222 (67.7) 250 (76.2) NA
80,000 17 (5.2) 64 (19.5) 165 (50.3) 222 (67.7) 249 (75.9)
100,000 NA 22 (6.7) 104 (31.7) 223 (68.0) 250 (76.2)
120,000 NA NA 11 (3.4) 93 (28.3) 237 (72.2)
3001 to 4000
(914 to 1219)
40,000* 39 (11.9) 184 (56.1) 214 (65.2) NA NA
60,000 23 (7.0) 119 (36.3) 210 (64.0) 235 (71.6) NA
80,000 15 (4.6) 59 (18.0) 155 (47.2) 210 (64.0) 232 (70.7)
100,000 NA 19 (5.8) 98 (29.9) 211 (64.3) 236 (71.9)
120,000 NA NA 8(2.4) 86 (26.2) 224 (68.3)
4001 to 4500
(1219 to
1370)
40,000* 36 (11.0) 177 (53.9) 205 (62.5) NA NA
60,000 21 (6.4) 115 (35.1) 204 (62.2) 228 (69.5) NA
80,000 14 (4.3) 56 (17.1) 150 (45.7) 202 (61.6) 224 (68.3)
100,000 NA 17 (5.2) 94 (28.7) 205 (62.5) 229 (69.8)
120,000 NA NA NA 83 (25.3) 217 (66.1)
* Not all families have these models.
Note: See notes at end of venting tables.
Note: Table 3 for altitudes over 4500 ft. (1370 M)
Table 2 – 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) NA NA NA NA
Medium Radius 90º Elbow 5(1.5) 5(1.5) 5(1.5) NA NA NA NA
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) NA NA NA NA
Medium Radius 45º Elbow 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) NA NA NA NA
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)
* Note: 3 --- and 4 ---in. Vent pipe systems require long radius elbows.
Venting System Length Calculations
The maximum length for each vent pipe (inlet or exhaust) equals the Maximum Equivalent Vent Length (MEVL) from Table 1orTable 3
minus the number of elbows multiplied by the deduction for each elbow in Table 2.
Standard vent terminations and concentric vent terminations count for zero deductions.
Example
A direct--vent 60,000 Btuh furnace installed at 2100 ft. (640 M ) with 2--in. (51 mm) vent piping. Venting system includes, FOR EACH
PIPE, (3) 90_long radius elbows, (2) 45_long radius elbows and a concentric vent kit.
Maximum Equivalent Vent Length =127 ft. (From Table 1)
Deduct (3) 90 long radius 3 x 3 ft. =- 9 ft. (From Table 2)
Deduct (2) 45 long radius 2 x 1.5 ft. =- 3 ft. (From Table 2)
Maximum Vent Length =115 ft. For EACH vent or inlet pipe

8
NOTE: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations. Use Table 2 - Deductions from
Maximum Equivalent Vent Length to determine allowable vent length for each application.
Table 3 – Maximum Equivalent Vent Length -- Ft. (M)
4501 to 10,000 Ft. (1371 to 3048 M) Altitude
Altitude
FT (M) Unit Size
DIRECT VENT (2-PIPE) AND NON---DIRECT VENT (1---PIPE)
Vent Pipe Diameter
1-1/2 22-1/2 3 4
4501 to 5000
(1370 to
1524)
40,0002*33 (10.1) 171 (52.1) 196 (59.7) NA NA
60,000 20 (6.1) 111 (33.8) 198 (60.4) 221 (67.4) NA
80,000 13 (4.0) 54 (16.5) 146 (44.5) 195 (59.4) 216 (65.8)
100,000 NA 16 (4.9) 91 (27.7) 200 (61.0) 222 (67.7)
120,000 NA NA NA 80 (24.4) 211 (64.3)
5001 to 6000
(1524 to
1829)
40,000* 27 (8.2) 158 (48.2) 179 (54.6) NA NA
60,000 16 (4.9) 103 (31.4) 186 (56.7) 207 (63.1) NA
80,000 11 (3.4) 49 (14.9) 137 (41.8) 183 (55.8) 200 (61.0)
100,000 NA 12 (3.7) 85 (25.9) 188 (57.3) 208 (63.4)
120,000 NA NA NA 74 (22.6) 199 (60.7)
6001 to 7000
(1829 to
2134)
40,000* 21 (6.4) 145 (44.2) 162 (49.4) NA NA
60,000 13 (4.0) 96 (29.3) 174 (53.0) 194 (59.1) NA
80,000 NA 44 (13.4) 120 (36.6) 171 (52.1) 185 (56.4)
100,000 NA 10 (3.0) 79 (24.1) 178 (54.3) 195 (59.4)
120,000 NA NA NA 68 (20.7) 187 (57.0)
7001 to 8000
(2134 to
2438)
40,000* 15 (4.6) 133 (40.5) 146 (44.5) NA NA
60,000 10 (3.0) 89 (27.1) 163 (49.7) 181 (55.2) NA
80,000 NA 40 (12.2) 120 (36.6) 159 (48.5) 170 (51.8)
100,000 NA NA 73 (22.3) 167 (50.9) 182 (55.5)
120,000 NA NA NA 62 (18.9) 175 (53.3)
8001 to 9000
(2438 to
2743)
40,000* 10 (3.0) 121 (36.9) 130 (39.6) NA NA
60,000 7(2.1) 82 (25.0) 152 (46.3) 168 (51.2) NA
80,000 NA 35 (10.7) 111 (33.8) 148 (45.1) 156 (47.5)
100,000 NA NA 67 (20.4) 157 (47.9) 170 (51.8)
120,000 NA NA NA 56 (17.1) 164 (50.0)
9001 to
10,000
(2743 to
3048)
40,000* 5(1.5) 110 (33.5) 115 (35.1) NA NA
60,000 NA 76 (23.2) 142 (43.3) 156 (47.5) NA
80,000 NA 31 (9.4) 103 (31.4) 137 (41.8) 142 (43.3)
100,000 NA NA 62 (18.9) 147 (44.8) 157 (47.9)
120,000 NA NA NA 51 (15.5) 153 (46.6)
*Not all families have these models.
NOTES:
1. 3 --- and 4 --- in. Vent pipe systems require long radius elbows.
2. Total equivalent vent lengths under 10’ for 40,000 Btuh furnaces, require the use of an outlet choke plate at altitudes 0 --- 2000 ft. (0 to 610 M).
Failure to use an outlet choke, when required, may result in flame disturbance or flame sense lockout.
3. Vent sizing for Canadian installations over 4500 ft (1370m) above sea level are subject to acceptance by the local authorities having jurisdiction.
4. NA --- Not allowed; pressure switch will not close, or flame disturbance may result.
5. Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.
6. Size both the combustion---air and vent pipe independently, then use the larger diameter 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. Elbows 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. (1.5 M) for all applications.
10. Use 3---in. (76 mm) diameter vent termination kit for installations requiring 4 ---in. (102 mm) diameter pipe.

9
MAXIMUM ALLOWABLE EXPOSED VENT LENGTHS INSULATION TABLE -- FT. (M)
Maximum Length of Uninsulated and Insulated Vent Pipe-Ft (M)
Two
Stage
Furnace
High Heat
Input
Winter
Design
Tem p °F
(°C)
Pipe
Length in
Ft. & M
No Insulation 3/8-in. (9.5 mm) 1/2-in. (12.7 mm)
Pipe Diameter-inches (mm) Pipe Diameter-inches (mm) Pipe Diameter-inches (mm)
1.5 2.0 2.5 3.0 4.0 1.5 2.0 2.5 3.0 4.0 1.5 2.0 2.5 3.0 4.0
(38) (51) (64) (76) (102) (38) (51) (64) (76) (102) (38) (51) (64) (76) (102)
40000**
20 (-10) Ft. 40.0 35.0 35.0 N/A N/A 50.0 104.0 94.0 N/A N/A 50.0 122.0 110.0 N/A N/A
M12.2 10.7 10.7 N/A N/A 15.2 31.7 28.7 N/A N/A 15.2 37.2 33.5 N/A N/A
0 (-20) Ft. 19.0 14.0 12.0 N/A N/A 50.0 61.0 54.0 N/A N/A 50.0 74.0 65.0 N/A N/A
M5.8 4.3 3.7 N/A N/A 15.2 18.6 16.5 N/A N/A 15.2 22.6 19.8 N/A N/A
-20 (-30) Ft. 9.0 3.0 1.0 N/A N/A 50.0 41.0 35.0 N/A N/A 50.0 51.0 43.0 N/A N/A
M2.7 0.9 0.3 N/A N/A 15.2 12.5 10.7 N/A N/A 15.2 15.5 13.1 N/A N/A
-40 (-40) Ft. 3.0 0.0 0.0 N/A N/A 39.0 29.0 23.0 N/A N/A 48.0 37.0 30.0 N/A N/A
M0.9 0.0 0.0 N/A N/A 11.9 8.8 7.0 N/A N/A 14.6 11.3 9.1 N/A N/A
60000
20 (-10) Ft. 30.0 51.0 51.0 45.0 N/A 30.0 135.0 138.0 120.0 N/A 30.0 135.0 162.0 141.0 N/A
M9.1 15.5 15.5 13.7 N/A 9.1 41.1 42.1 36.6 N/A 9.1 41.1 49.4 43.0 N/A
0 (-20) Ft. 30.0 24.0 23.0 16.0 N/A 30.0 93.0 82.0 69.0 N/A 30.0 111.0 98.0 83.0 N/A
M9.1 7.3 7.0 4.9 N/A 9.1 28.3 25.0 21.0 N/A 9.1 33.8 29.9 25.3 N/A
-20 (-30) Ft. 18.0 11.0 9.0 1.0 N/A 30.0 65.0 56.0 44.0 N/A 30.0 79.0 68.0 55.0 N/A
M5.5 3.4 2.7 0.3 N/A 9.1 19.8 17.1 13.4 N/A 9.1 24.1 20.7 16.8 N/A
-40 (-40) Ft. 10.0 3.0 0.0 0.0 N/A 30.0 48.0 40.0 29.0 N/A 30.0 59.0 50.0 38.0 N/A
M3.0 0.9 0.0 0.0 N/A 9.1 14.6 12.2 8.8 N/A 9.1 18.0 15.2 11.6 N/A
80000
20 (-10) Ft. 20.0 64.0 64.0 56.0 47.0 20.0 70.0 173.0 150.0 125.0 20.0 70.0 175.0 177.0 147.0
M6.1 19.5 19.5 17.1 14.3 6.1 21.3 52.7 45.7 38.1 6.1 21.3 53.3 53.9 44.8
0 (-20) Ft. 20.0 32.0 30.0 22.0 11.0 20.0 70.0 104.0 87.0 67.0 20.0 70.0 124.0 104.0 82.0
M6.1 9.8 9.1 6.7 3.4 6.1 21.3 31.7 26.5 20.4 6.1 21.3 37.8 31.7 25.0
-20 (-30) Ft. 20.0 17.0 14.0 6.0 0.0 20.0 70.0 71.0 57.0 40.0 20.0 70.0 86.0 71.0 52.0
M6.1 5.2 4.3 1.8 0.0 6.1 21.3 21.6 17.4 12.2 6.1 21.3 26.2 21.6 15.8
-40 (-40) Ft. 15.0 7.0 5.0 0.0 0.0 20.0 61.0 52.0 40.0 24.0 20.0 70.0 64.0 50.0 33.0
M4.6 2.1 1.5 0.0 0.0 6.1 18.6 15.8 12.2 7.3 6.1 21.3 19.5 15.2 10.1
100000
20 (-10) Ft. N/A 25.0 79.0 70.0 59.0 N/A 25.0 110.0 186.0 155.0 N/A 25.0 110.0 219.0 182.0
MN/A 7.6 24.1 21.3 18.0 N/A 7.6 33.5 56.7 47.2 N/A 7.6 33.5 66.8 55.5
0 (-20) Ft. N/A 25.0 40.0 31.0 19.0 N/A 25.0 110.0 109.0 86.0 N/A 25.0 110.0 131.0 104.0
MN/A 7.6 12.2 9.4 5.8 N/A 7.6 33.5 33.2 26.2 N/A 7.6 33.5 39.9 31.7
-20 (-30) Ft. N/A 23.0 21.0 13.0 0.0 N/A 25.0 91.0 74.0 54.0 N/A 25.0 110.0 90.0 68.0
MN/A 7.0 6.4 4.0 0.0 N/A 7.6 27.7 22.6 16.5 N/A 7.6 33.5 27.4 20.7
-40 (-40) Ft. N/A 13.0 10.0 1.0 0.0 N/A 25.0 68.0 53.0 35.0 N/A 25.0 83.0 66.0 46.0
MN/A 4.0 3.0 0.3 0.0 N/A 7.6 20.7 16.2 10.7 N/A 7.6 25.3 20.1 14.0
120000
20 (-10) Ft. N/A N/A 15.0 85.0 73.0 N/A N/A 15.0 100.0 190.0 N/A N/A 15.0 100.0 224.0
MN/A N/A 4.6 25.9 22.3 N/A N/A 4.6 30.5 57.9 N/A N/A 4.6 30.5 68.3
0 (-20) Ft. N/A N/A 15.0 41.0 29.0 N/A N/A 15.0 100.0 109.0 N/A N/A 15.0 100.0 131.0
MN/A N/A 4.6 12.5 8.8 N/A N/A 4.6 30.5 33.2 N/A N/A 4.6 30.5 39.9
-20 (-30) Ft. N/A N/A 15.0 20.0 7.0 N/A N/A 15.0 94.0 71.0 N/A N/A 15.0 114.0 88.0
MN/A N/A 4.6 6.1 2.1 N/A N/A 4.6 28.7 21.6 N/A N/A 4.6 34.7 26.8
-40 (-40) Ft. N/A N/A 15.0 7.0 0.0 N/A N/A 15.0 69.0 48.0 N/A N/A 15.0 85.0 62.0
MN/A N/A 4.6 2.1 0.0 N/A N/A 4.6 21.0 14.6 N/A N/A 4.6 25.9 18.9
* Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe
length calculated from Ta b l e 1or3.
**Not all families have these models.
† Insulation thickness based on R value of 3.5 per in.

10
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
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.
TIGHT RADIUS
PVC 90°ELBOW
12” (300 mm) Minimum
A11487