Bryant EVOLUTION 987MA Operation manual

1
987MA
EVOLUTIONRMODULATING
4--WAY MULTIPOSE, VARIABLE SPEED
CONDENSING GAS FURNACE, SERIES A
Product Data
A11264
The 987MA Multipoise Variable--Speed Condensing Gas Furnace
features the modulating EvolutionRSystem. The Perfect HeatR
Technology modulating gas system is at the heart of the comfort
provided by this furnace, along with the Perfect ECMt
full--featured variable--speed communicating blower motor, and
variable--speed inducer motor. With an Annual Fuel Utilization
Efficiency (AFUE) of up to 98.3%, the Evolution modulating gas
furnace provides exceptional savings as well. This Evolution Gas
Furnace also features 4--way multipoise installation flexibility, and
is available in six model sizes. The 987MA 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
SEvolution System; compatible with single-- and multi--zone
Evolution systems.
SEvolution Features—match with the Evolution Control for
Evolution System benefits.
SAll sizes meet ENERGY STARRVersion 4.0 criteria for gas
furnaces: 95+AFUE; AMACF electrical rating; 2% or less
cabinet airflow leakage.
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
installation with unique vent elbow and optional through--
the--cabinet downflow venting capability.
SFull--featured variable--speed communicating blower motor,
variable--speed inducer motor, and modulating gas valve.
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 Air Purifier and Humidifier connections.
SDirect--vent/sealed combustion or ventilated combustion air.
SInstallation flexibility: sidewall or vertical vent.
SResidential installations may be eligible for consumer financing
through the Retail Credit Program.
SVariable--Speed blower motor, variable--speed inducer motor,
and modulating 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.
SCertified to leak 2% or less of nominal air conditioning CFM
delivered when pressurized to 1--in. water column with all
present air inlets, air outlets, and condensate drain port(s) sealed.
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
SAP ORDERING NO.
CASING
DIMENSIONS (IN.)
RATED HEATING OUTPUT{
(BTUH) HEATING AIRFLOW COOLING
CFM @ 0.5
ESP
MOTOR
HP
(VARIABLE
SPEED)
MEDIA
CABINET
SUPPLIED
(IN.)
APPROX.
SHIP WT
(LB)
H D W Maximum Minimum AFUE
CFM‡
(Minimum
Heating)
CFM
(Maximum
Heating)
Rated Heat-
ing ESP
@Maximum
987MA42060V17 35 29.5 17.5 59,000 24,000 97.0% 415 1075 0.12 510 - 1335 1/2 16 154
987MA60060V21 35 29.5 21.0 60,000 24,000 98.3% 555 1085 0.12 510 - 1905 120 159
987MA42080V17 35 29.5 17.5 78,000 31,000 97.0% 620 1500 0.15 490 - 1375 1/2 16 164
987MA60080V21 35 29.5 21.0 78,000 31,000 97.0% 620 1345 0.15 750 - 1945 120 169
987MA66100V21 35 29.5 21.0 98,000 39,000 97.0% 725 1575 0.20 715 - 2160 120 179
987MA66120V24 35 29.5 24.5 117,000 47,000 97.0% 900 1820 0.20 885 - 2185 124 203
{Capacity in accordance with DOE test procedures. Ratings are position dependent. See rating plate.
‡Minimum heat CFM when low---heat rise adjustment switch (SW 1---3) and comfort/efficiency adjustment switch (SW1 ---4) on control center are OFF.
ESP --- External Static Pressure
FEATURES AND BENEFITS
Fully Modulating Gas Valve — When paired with the
EvolutionRcontrol, this furnace improves comfort by adjusting
heating output in 1% increments from 40% to 100% capacity to
meet the heating needs of the home. Precision begins with a
stepper motor to adjust manifold pressures. Stepper motors are
used in electronic devices, such as computer disc drives, which
require precise mechanical positioning. The precision of the
stepper motor, combined with our unique two-point calibration,
allows the modulating furnace to accurately control and directly
deliver the right amount of gas to the burners every time.
Perfect HumidityRTechnology —The Perfect Humidity system
actively controls both temperature and humidity in the home to
provide the best comfort all year long. Other systems depend on
heating or cooling demand to manage the moisture in the air. But,
Perfect Humidity gives the homeowner the right amount of
humidity day and night, even in mild weather. No other
manufacturer can do this! Perfect Humidity saves energy, too. By
keeping humidity under control, the homeowner can set their
thermostat lower to stay comfortable and save energy.
SmartEvaptTechnology — When paired with a compatible
thermostat, this dehumidification feature overrides the cooling
blower off-delay when there is a call for dehumidification. By
deactivating the blower off-delay, SmartEvap technology prevents
condensate that remains on the coil after a dehumidification cycle
from re-humidifying throughout the home. This results in reduced
humidity and a more comfortable indoor environment for the
homeowner.
Unlike competitive systems, SmartEvap technology only overrides
the cooling when humidity control is needed. Once humidity is
back in control, SmartEvap re-enables the energy-saving cooling
blower off-delay.
FanOnPlustTechnology — Sometimes the constant fan setting
on a standard furnace system can actually reduce homeowner
comfort by providing too much or too little air! Fan On Plus
technology improves comfort all year long by allowing the
homeowner to select the continuous fan speed of their choice using
a compatible thermostat.
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.
Full-Featured, Communicating, Variable Speed Motors —Our
Perfect ECMt(Electronically Commutated Motor) provides
variable-speed operation to optimize comfort levels in the home
year round; features such as passive/active dehumidification,
ramping profiles, constant air flow and quiet operation. They can
provide cooling match enhancements to increase the effective
SEER of select Bryant air conditioner or heat pump system, and
feature the highest efficiency of all indoor fan motors.
Reliable Heat Exchanger Design — The aluminized steel,
clamshell primary heat exchanger was reengineered 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.
Media Filter Cabinet — Enhanced indoor air quality in the home
is made easier with our media filter cabinet—a standard accessory
on all deluxe furnaces. When installed as a part of the system, this
cabinet allows for easy and convenient addition of a Bryant high
efficiency air filter.
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 Venting or Optional Ventilated Combustion Air —This
furnace can be installed as a 2-pipe (Direct Vent) furnace or as an
optional ventilated combustion air application. 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.
Insulated Casing — Foil-faced insulation in heat exchanger
section of the casing minimizes heat loss. The acoustical insulation
in the blower compartment reduces air and motor noise for quiet
operation.
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 GAMA efficiency rating certified. This
furnace meets California Air Quality Management District
emission requirements.
987MA

3
SPECIFICATIONS
Heating Capacity and Efficiency 42060 60060 42080 60080 66100 66120
Input Maximum
Heat (BTUH) 60,000 60,600 80,000 80,000 100,000 120,000
Intermediate
Heat (BTUH) 39,000 39,000 52,000 52,000 65,000 78,000
Minimum
Heat (BTUH) 24,000 24,000 32,000 32,000 40,000 48,000
Output Maximum
Heat (BTUH) 59,000 60,000 78,000 78,000 98,000 117,000
Intermediate
Heat (BTUH) 38,000 39,000 51,000 51,000 64,000 76,000
Minimum
Heat (BTUH) 24,000 24,000 31,000 31,000 39,000 47,000
Efficiency AFUE % (ICS) 97.0 98.3 97.0 97.0 97.0 97.0
Certified Temperature
Rise Range ºF (ºC)
Maximum Heat 35 - 65
(19 - 36)
35 - 65
(19 - 36)
40 - 70
(22 - 39)
40 - 70
(22 - 39)
45 - 75
(25 - 42)
45 - 75
(25 - 42)
Intermediate Heat 50 - 80
(28 - 44)
40 - 70
(22 - 39)
50 - 80
(28 - 44)
50 - 80
(28 - 44)
50 - 80
(28 - 44)
50 - 80
(28 - 44)
Minimum Heat 35 - 65
(19 - 36)
25 - 55
(14-31)
35 - 65
(19 - 36)
35 - 65
(19 - 36)
35 - 65
(19 - 36)
35 - 65
(19 - 36)
Airflow Capacity and Blower Data 42060 60060 42080 60080 66100 66120
Certified External Static
Pressure (in. w.c.)
Heating 0.12 0.12 0.15 0.15 0.20 0.20
Cooling 0.5 0.5 0.5 0.5 0.5 0.5
Airflow Delivery
@ Rated ESP (CFM)
Maximum Heat 1075 1080 1500 1345 1575 1820
Intermediate Heat 530 690 750 795 955 1100
Minimum Heat 415 555 620 595 745 900
Cooling 1335 1905 1375 1945 2160 2185
Cooling Capacity (tons)
@ 400, 350 CFM/ton
CFM/ton 34.5 3.5 4.5 5.5 5.5
CFM/ton 3.5 5.5 45.5 6 6
Direct-Drive Motor Type Electronically Commutated Motor (ECM)
Direct-Drive Motor HP 1/2 11/2 1 1 1
Motor Full Load Amps 7.7 12.8 7.7 12.8 12.8 12.8
RPM Range 300 - 1300
Speed Selections Variable (Communicating)
Blower Wheel Dia x Width in. 11 x 8 11 x 10 11 x 8 11 x 10 11 x 10 11 x 11
Air Filtration System Factory Supplied Media Cabinet
Field Supplied Filter
Filter Used for Certified Watt Data KGAWF1306UFR KGAWF1406UFR KGAWF1306UFR KGAWF1406UFR KGAWF1506UFR
Electrical Data 42060 60060 42080 60080 66100 66120
Input Voltage Volts-Hertz-Phase 115-60-1
Operating Voltage Range Min-Max 104 -127
Maximum Input Amps Amps 9.7 14.8 9.7 14.8 14.8 14.8
Unit Ampacity Amps 12.7 19.1 12.7 19.1 19.1 19.1
Minimum Wire Size AWG 14 12 14 12 12 12
Maximum Wire Length
@ Minimum Wire Size
Feet 29 30 29 30 30 30
(M) (8.8) (9.1) (8.8) (9.1) (9.1) (9.1)
Maximum Fuse/Ckt Bkr
(Time-Delay Type Recommended) Amps 15 20 15 20 20 20
Transformer Capacity (24vac output) 40VA
External Control Power
Available
Heating 27.9 VA
Cooling 34.6 VA
Controls 42060 60060 42080 60080 66100 66120
Gas Connection Size 1/2" - NPT
Burners (Monoport) 3 3 4 4 5 6
Gas Valve (Redundant) Manufacturer White Rogers
Minimum Inlet Gas pressure (in. wc) 4.5
Maximum Inlet Gas pressure (in. wc) 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
987MA

4
SPECIFICATIONS (CONTINUED)
Controls 42060 60060 42080 60080 66100 66120
Limit Control 180 160 170 200 180 160
Heating Blower Control (Heating Off-Delay) Adjustable: 90, 120, 150, 180 seconds
Cooling Blower Control (Time Delay Relay) 90 seconds
Communication System Evolution, Evolution Zoning
Thermostat Connections R, W/W1, W2 Y/Y2, Y1, G, Com 24V, DHUM
Accessory Connections EAC (115vac); HUM (24vac); 1-stg AC (via Y/Y2)
MODEL NUMBER NOMENCLATURE
98 7MA42 060 V17 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
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.
A11162
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
987MA

5
ACCESSORIES
Part Number Used With Notes
1llACVB1010CDAGK
KGAVT0701CVT See Venting Tables 1
KGAVT0801CVT See Venting Tables 1
KGAVT0101BRA See Venting Tables 1, 2
KGAVT0201BRA See Venting Tables 1, 2
Part Number Used With Notes
7llAPFC1020THAGK
-llAPFC1010THAGK
-llACVP0110DAAGK
KGACK0101HCK All DV Horizontal -
6llA1000-809P
Part Number Used With Notes
-llALLA1020BSAGK
-llALLA1010ADAGK
-llALLA1020ADAGK
-llALLA1030ADAGK
KGARP0301B17 17.5" Wide Furnaces 7
KGARP0301B21 21" Wide Furnaces 7
KGARP0301B24 24.5" Wide Furnaces 7
KGAAD0101MEC 20"x25" IAQ Devices 7
KGAAD0201MEC 24"x25" IAQ Devices 7
Part Number Used With Notes
-llAPSV1025PNAGK
-llAPSV1044NPAGK
KGAHA0150N42 All 4, 6
KGAHA0250N43 All 4, 6
4llA44N0530AHAGK
4llA54N0540AHAGK
4llA64N0550AHAGK
4llA74N0551AHAGK
4llA
84N0561AHAGK
KGAHA0650P54 All 4, 6
4llA55P0570AHAGK
KGAHA0850P56 All 4, 6
KGAHA5750125 All 4, 6
KGAHA5750130 All 4, 6
Part Number Used With Notes
-llASMF1030DSAGK
-llAMPA1030DSAGK
-llAD-10DIUBBXTSYS
-llAD-10ZIUBBXTSYS
Part Number Used With Notes
5llARFU6031FWAGK
5llARFU6051FWAGK
EXPXXFIL0016 EZXCAB--1016 3, 5
EXPXXFIL0020 EZXCAB--1020 3, 5
EXPXXFIL0024 EZXCAB--1024 3, 5
EXPXXUNV0016 EZXCAB--1016 3, 5
EXPXXUNV0020 EZXCAB--1020 3, 5
EXPXXUNV0024 EZXCAB--1024 3, 5
FILXXCAR0016 FILCABXL1016 3, 5
FILXXCAR0020 FILCABXL1020 3, 5
FILXXCAR0024 FILCABXL2024 3, 5
GAPAAXBB1625 Up to 1600 CFM 5
GAPAAXBB2025 Up to 2000 CFM 5
GAPBBCAR1625 GAPAAXCC1625-A08 5
GAPBBCAR2025 GAPAAXCC2025-A08 5
PGAPXX1625 Up to 1600 CFM 5, 7
PGAPXX2025 Up to 2000 CFM 5, 7
PGAPAXXCAR1625 GAPAAXBB1625 5, 7
PGAPAXXCAR2025 GAPAAXBB2025 5, 7
Notes:
2. Not for use with Concentric Vent Termination Kits.
3. Last 2 digits of Part Number indicate filter size.
4. Last 2 digits of Part Number indicate orifice size.
5. Choose IAQ/filter assembly appropriate for the designed system airflow and static pressure. Use optional IAQ Device Duct Adapters as required.
6. Available from Replacement Components group.
7. Kit coming soon. Expected availability 2Q2012.
1. CSA requires that a termination kit be used. See latest PD for pipe and kit size selection. The qualified installer or agency must use only
factory-authorized kits when modifying these furnaces.
Bryant Preferred Air Purifier Repl. Filter 16 x 25
20 x 25
Bryant Perfect Air Purifier Replacement Filter 16 x 25
20 x 25
Bryant Preferred Air Purifier 16 x 25
20 x 25
Cartridge Media Filter
16-in.
20-in.
24.in.
Bryant Perfect Air Purifier 16 x 25
20 x 25
EZ-Flex Filter with End Caps
16-in.
20-in.
24-in.
Filter Pack (6 pack) - Washable 16 x 25 x 1
24 x 25 x 1
EZ-Flex Filter
16-in.
20-in.
24-in.
IAQ Accessories
Evolution™Control Zoning User Interface
Evolution™Control User Interface
ECM Motor Simulator Kit
#54 LP
#55 LP
#56 LP
1.25 mm LP
1.30 mm LP
Control Accessories
Advanced Product Monitor - APM
Gas Orifice Kit
#42 Natural Gas
#43 Natural Gas
#44 Natural Gas
#45 Natural Gas
#46 Natural Gas
#47 Natural Gas
#48 Natural Gas
Gas Conversion Accessories
Gas Conversion Kit - Nat to LP; Var-spd Products
Gas Conversion Kit - LP to Nat; Var-spd Products
Return Air Base (Upflow applications) - Painted
17.5-in. wide
21-in. wide
24.5-in. wide
IAQ Device Duct Adapters (side return) - Painted 20-in IAQ to 16-in side return
24-in IAQ to 16-in side return
Furnace Base Kit for Combustible Floors
Coil Adapters Kits - Painted
No Offset
Single Offsett
Double Offset
Condensate Drainage Accessories
Freeze Protect Kit - Heat Patch for Drain Trap
Freeze Protect Kit - Heat Tape
CPVC to PVC Drain Adapter - 1/2-in. CPVC to 3/4-in. PVC
Horizontal Trap Grommet for Direct Vent Applications
Condensate Neutralizer Kit
Venting Accessories
Vent Kit - Through the Cabinet
Vent Terminal - Concentric 2-in.
3-in.
Vent Terminal Bracket 2-in.
3-in.
Ductwork Adapter Accessories
987MA

6
AIR DELIVERY -- CFM
Cooling4and Heating Air Delivery -- CFM (Bottom Return5With Filter)
(SW1-5 and SW4-3 set to OFF, except as indicated. See notes 1 and 2)
Unit Size Clg/CF Switch Settings External Static Pressure (ESP)
SWx-3 SWx-2 SWx-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
42060
Clg Default: OFF OFF OFF 1060 1070 1080 1080 1075 1065 1050 1035 1025 1010
CF Default: OFF OFF OFF 545 530 520 525 510 Seenote4
Cooling (SW2)
Cont Fan (SW3)
OFF OFF ON 545 530 520 525 510 Seenote4
OFF ON OFF 710 710 710 695 690 Seenote4
OFF ON ON 875 880 890 895 895 890 885 880 870 855
ON OFF OFF 1060 1070 1080 1080 1075 1065 1050 1035 1025 1010
ON OFF ON 1235 1240 1250 1255 1255 1250 1230 1190 1155 1115
ON ON OFF 1235 1240 1250 1255 1255 1250 1230 1190 1155 1115
ON ON ON 1235 1240 1250 1255 1255 1250 1230 1190 1155 1115
Clg SW2: Maximum Clg Airflow 21425 1425 1405 1370 1335 1300 1260 1225 1190 1155
Heating
(SW1)
Maximum Heat Airflow 31075 1085 1095 1095 1090 1080 1065 1050 1035 1020
Intermediate Heat Airflow 3535 515 505 515 495 Seenote4
Minimum Heat Airflow 3420 410 415 400 380 Seenote4
Unit Size Clg/CF Switch Settings External Static Pressure (ESP)
SWx-3 SWx-2 SWx-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
60060
Clg Default: OFF OFF OFF 1735 1735 1725 1715 1700 1685 1665 1650 1625 1605
CF Default: OFF OFF OFF 545 530 520 525 510 Seenote4
Cooling (SW2)
Cont Fan (SW3)
OFF OFF ON 540 525 525 520 540 Seenote4
OFF ON OFF 680 725 725 720 720 Seenote4
OFF ON ON 925 915 910 895 900 890 875 865 860 855
ON OFF OFF 1070 1075 1080 1070 1080 1075 1055 1045 1030 1020
ON OFF ON 1215 1245 1235 1220 1220 1210 1200 1195 1185 1175
ON ON OFF 1380 1385 1395 1390 1395 1390 1380 1365 1355 1340
ON ON ON 1735 1735 1725 1715 1700 1685 1665 1650 1625 1605
Clg SW2: Maximum Clg Airflow 21955 1950 1940 1925 1905 1885 1855 1815 1745 1685
Heating
(SW1)
Maximum Heat Airflow 31080 1085 1095 1090 1095 1085 1070 1055 1045 1030
Intermediate Heat Airflow 3685 725 730 725 730 Seenote4
Minimum Heat Airflow 3560 555 555 550 565 Seenote4
Unit Size Clg/CF Switch Settings External Static Pressure (ESP)
SWx-3 SWx-2 SWx-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
42080
Clg Default: OFF OFF OFF 1055 1065 1080 1075 1065 1050 1045 1035 1025 1005
CF Default: OFF OFF OFF 520 505 505 495 490 Seenote4
Cooling (SW2)
Cont Fan (SW3)
OFF OFF ON 520 505 505 495 490 Seenote4
OFF ON OFF 665 685 680 660 665 Seenote4
OFF ON ON 885 895 905 900 900 895 885 875 860 845
ON OFF OFF 1055 1065 1080 1075 1065 1050 1045 1035 1025 1005
ON OFF ON 1245 1245 1255 1255 1260 1255 1250 1235 1220 1185
ON ON OFF 1245 1245 1255 1255 1260 1255 1250 1235 1220 1185
ON ON ON 1245 1245 1255 1255 1260 1255 1250 1235 1220 1185
Clg SW2: Maximum Clg Airflow 21520 1485 1450 1415 1375 1335 1300 1265 1225 1190
Heating
(SW1)
Maximum Heat Airflow 31520 1485 1450 1415 1375 1335 1300 1265 1225 1190
Intermediate Heat Airflow 3755 745 755 755 765 Seenote4
Minimum Heat Airflow 3620 625 630 620 610 Seenote4
987MA

7
AIR DELIVERY -- CFM (CONTINUED)
Cooling4and Heating Air Delivery -- CFM (Bottom Return5With Filter)
(SW1-5 and SW4-3 set to OFF, except as indicated. See notes 1 and 2)
Unit Size Clg/CF Switch Settings External Static Pressure (ESP)
SWx-3 SWx-2 SWx-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
60080
Clg Default: OFF OFF OFF 1745 1755 1755 1760 1755 1750 1745 1725 1705 1685
CF Default: OFF OFF OFF 700 710 750 725 750 Seenote4
Cooling (SW2)
Cont Fan (SW3)
OFF OFF ON 700 710 750 725 750 Seenote4
OFF ON OFF 830 860 870 890 960 Seenote4
OFF ON ON 1045 1045 1060 1070 1070 1070 1095 1090 1080 1070
ON OFF OFF 1215 1220 1245 1240 1235 1235 1225 1220 1235 1235
ON OFF ON 1370 1370 1390 1390 1400 1395 1400 1390 1390 1385
ON ON OFF 1745 1755 1755 1760 1755 1750 1745 1725 1705 1685
ON ON ON 1745 1755 1755 1760 1755 1750 1745 1725 1705 1685
Clg SW2: Maximum Clg Airflow 21920 1920 1945 1945 1945 1960 1950 1940 1915 1900
Heating
(SW1)
Maximum Heat Airflow 31340 1355 1370 1385 1380 1385 1400 1400 1385 1380
Intermediate Heat Airflow 3780 810 835 840 845 Seenote4
Minimum Heat Airflow 3595 595 600 595 605 Seenote4
Unit Size Clg/CF Switch Settings External Static Pressure (ESP)
SWx-3 SWx-2 SWx-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
66100
Clg Default: OFF OFF OFF 1820 1825 1840 1845 1840 1835 1825 1805 1780 1770
CF Default: OFF OFF OFF 750 740 745 730 715 Seenote4
Cooling (SW2)
Cont Fan (SW3)
OFF OFF ON 750 740 745 730 715 Seenote4
OFF ON OFF 900 900 915 910 905 Seenote4
OFF ON ON 1070 1075 1095 1095 1090 1085 1095 1080 1065 1070
ON OFF OFF 1280 1285 1305 1305 1310 1305 1295 1300 1290 1285
ON OFF ON 1440 1445 1465 1465 1470 1485 1480 1485 1475 1460
ON ON OFF 1820 1825 1840 1845 1840 1835 1825 1805 1780 1770
ON ON ON 2135 2140 2140 2135 2140 2130 2115 2100 2070 2015
Clg SW2: Maximum Clg Airflow 22160 2165 2175 2170 2160 2150 2135 2120 2065 2020
Heating
(SW1)
Maximum Heat Airflow 31570 1575 1595 1595 1600 1605 1600 1600 1590 1575
Intermediate Heat Airflow 3950 955 965 975 970 Seenote4
Minimum Heat Airflow 3755 745 750 735 720 Seenote4
Unit Size Clg/CF Switch Settings External Static Pressure (ESP)
SWx-3 SWx-2 SWx-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
66120
Clg Default: OFF OFF OFF 1850 1855 1860 1855 1850 1830 1805 1775 1750 1730
CF Default: OFF OFF OFF 930 925 915 900 885 Seenote4
Cooling (SW2)
Cont Fan (SW3)
OFF OFF ON 765 745 740 705 680 Seenote4
OFF ON OFF 930 925 915 900 885 Seenote4
OFF ON ON 1095 1100 1110 1105 1085 Seenote4
ON OFF OFF 1265 1255 1265 1280 1275 1285 1270 1260 1250 1230
ON OFF ON 1465 1455 1470 1465 1465 1470 1455 1450 1435 1415
ON ON OFF 1850 1855 1860 1855 1850 1830 1805 1775 1750 1730
ON ON ON 2200 2200 2200 2190 2185 2170 2145 2085 1990 1890
Clg SW2: Maximum Clg Airflow 22200 2200 2200 2190 2185 2170 2145 2085 1990 1890
Heating
(SW1)
Maximum Heat Airflow 31815 1820 1825 1820 1815 1795 1775 1745 1720 1700
Intermediate Heat Airflow 31095 1100 1110 1105 1085 Seenote4
987MA

8
AIR DELIVERY -- CFM NOTES
1. Nominal 350 CFM/ton cooling airflow is delivered with SW1-5 and SW4-3 set to OFF.
Set SW1-5 to ON for nominal 400 CFM/ton (+15% airflow).
Set SW4-3 to ON for nominal 325 CFM/ton (-7% airflow).
Set both SW1-5 and SW4-3 to ON for nominal 370 CFM/ton (+7% airflow).
The above adjustments in airflow are subject to motor horsepower range/capacity.
2. Maximum cooling airflow is achieved when switches SW2-1, SW2-2, SW2-3 and SW1-5 are set to ON, and SW4-3 is set to OFF.
3. All heating CFM’s are when low/medium 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 ESP. Operation within the blank areas of the chart is not
recommended because high-heat operation will be above 1.0 ESP.
5. All airflows on 21” casing size furnaces are 5% less on side return only installations.
6. Side returns for 24.5” casing sizes require two sides, or side and bottom, to allow sufficient airflow at the return of the furnace.
987MA

9
MAXIMUM ALLOWABLE EXPOSED VENT LENGHTS INSULATION TABLE -- FT. / M
Maximum Length of Uninsulated and Insulated Vent Pipe-Ft (M)
Modulating
Furnace High
Heat Input
Winter Design
Te m 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)
60000
20 (-10)
Ft. 34.0 29.0 28.0 23.0 N/A 55.0 88.0 79.0 69.0 N/A 55.0 104.0 93.0 81.0 N/A
M10.4 8.8 8.5 7.0 N/A 16.8 26.8 24.1 21.0 N/A 16.8 31.7 28.3 24.7 N/A
0 (-20)
Ft. 14.0 9.0 7.0 0.0 N/A 55.0 49.0 43.0 34.0 N/A 55.0 60.0 52.0 42.0 N/A
M4.3 2.7 2.1 0.0 N/A 16.8 14.9 13.1 10.4 N/A 16.8 18.3 15.8 12.8 N/A
-20 (-30)
Ft. 5.0 0.0 0.0 0.0 N/A 41.0 32.0 26.0 18.0 N/A 50.0 40.0 33.0 24.0 N/A
M1.5 0.0 0.0 0.0 N/A 12.5 9.8 7.9 5.5 N/A 15.2 12.2 10.1 7.3 N/A
-40 (-40)
Ft. 0.0 0.0 0.0 0.0 N/A 30.0 21.0 16.0 8.0 N/A 37.0 28.0 22.0 13.0 N/A
M0.0 0.0 0.0 0.0 N/A 9.1 6.4 4.9 2.4 N/A 11.3 8.5 6.7 4.0 N/A
60600
20 (-10)
Ft. 34.0 29.0 28.0 23.0 N/A 55.0 88.0 79.0 69.0 N/A 55.0 104.0 93.0 81.0 N/A
M10.4 8.8 8.5 7.0 N/A 16.8 26.8 24.1 21.0 N/A 16.8 31.7 28.3 24.7 N/A
0 (-20)
Ft. 14.0 9.0 7.0 0.0 N/A 55.0 49.0 43.0 34.0 N/A 55.0 60.0 52.0 42.0 N/A
M4.3 2.7 2.1 0.0 N/A 16.8 14.9 13.1 10.4 N/A 16.8 18.3 15.8 12.8 N/A
-20 (-30)
Ft. 5.0 0.0 0.0 0.0 N/A 41.0 32.0 26.0 18.0 N/A 50.0 40.0 33.0 24.0 N/A
M1.5 0.0 0.0 0.0 N/A 12.5 9.8 7.9 5.5 N/A 15.2 12.2 10.1 7.3 N/A
-40 (-40)
Ft. 0.0 0.0 0.0 0.0 N/A 30.0 21.0 16.0 8.0 N/A 37.0 28.0 22.0 13.0 N/A
M0.0 0.0 0.0 0.0 N/A 9.1 6.4 4.9 2.4 N/A 11.3 8.5 6.7 4.0 N/A
80000
20 (-10)
Ft. 35.0 39.0 39.0 33.0 25.0 35.0 118.0 107.0 92.0 76.0 35.0 130.0 125.0 109.0 90.0
M10.7 11.9 11.9 10.1 7.6 10.7 36.0 32.6 28.0 23.2 10.7 39.6 38.1 33.2 27.4
0 (-20)
Ft. 22.0 16.0 14.0 7.0 0.0 35.0 69.0 60.0 49.0 35.0 35.0 83.0 72.0 60.0 45.0
M6.7 4.9 4.3 2.1 0.0 10.7 21.0 18.3 14.9 10.7 10.7 25.3 21.9 18.3 13.7
-20 (-30)
Ft. 11.0 5.0 2.0 0.0 0.0 35.0 46.0 39.0 29.0 16.0 35.0 57.0 48.0 37.0 23.0
M3.4 1.5 0.6 0.0 0.0 10.7 14.0 11.9 8.8 4.9 10.7 17.4 14.6 11.3 7.0
-40 (-40)
Ft. 4.0 0.0 0.0 0.0 0.0 35.0 33.0 26.0 17.0 4.0 35.0 41.0 34.0 24.0 11.0
M1.2 0.0 0.0 0.0 0.0 10.7 10.1 7.9 5.2 1.2 10.7 12.5 10.4 7.3 3.4
100000
20 (-10)
Ft. N/A 47.0 47.0 41.0 32.0 N/A 50.0 110.0 112.0 93.0 N/A 50.0 110.0 132.0 110.0
MN/A 14.3 14.3 12.5 9.8 N/A 15.2 33.5 34.1 28.3 N/A 15.2 33.5 40.2 33.5
0 (-20)
Ft. N/A 21.0 19.0 12.0 1.0 N/A 50.0 74.0 61.0 45.0 N/A 50.0 89.0 74.0 57.0
MN/A 6.4 5.8 3.7 0.3 N/A 15.2 22.6 18.6 13.7 N/A 15.2 27.1 22.6 17.4
-20 (-30) Ft. N/A 8.0 6.0 0.0 0.0 N/A 50.0 49.0 38.0 23.0 N/A 50.0 60.0 48.0 32.0
MN/A 2.4 1.8 0.0 0.0 N/A 15.2 14.9 11.6 7.0 N/A 15.2 18.3 14.6 9.8
-40 (-40) Ft. N/A 1.0 0.0 0.0 0.0 N/A 42.0 34.0 24.0 10.0 N/A 50.0 43.0 32.0 18.0
MN/A 0.3 0.0 0.0 0.0 N/A 12.8 10.4 7.3 3.0 N/A 15.2 13.1 9.8 5.5
120000
20 (-10)
Ft. N/A N/A 15.0 49.0 40.0 N/A N/A 15.0 100.0 111.0 N/A N/A 15.0 100.0 131.0
MN/A N/A 4.6 14.9 12.2 N/A N/A 4.6 30.5 33.8 N/A N/A 4.6 30.5 39.9
0 (-20)
Ft. N/A N/A 15.0 17.0 6.0 N/A N/A 15.0 75.0 57.0 N/A N/A 15.0 90.0 70.0
MN/A N/A 4.6 5.2 1.8 N/A N/A 4.6 22.9 17.4 N/A N/A 4.6 27.4 21.3
-20 (-30)
Ft. N/A N/A 10.0 2.0 0.0 N/A N/A 15.0 48.0 32.0 N/A N/A 15.0 59.0 42.0
MN/A N/A 3.0 0.6 0.0 N/A N/A 4.6 14.6 9.8 N/A N/A 4.6 18.0 12.8
-40 (-40)
Ft. N/A N/A 1.0 0.0 0.0 N/A N/A 15.0 32.0 17.0 N/A N/A 15.0 41.0 25.0
MN/A N/A 0.3 0.0 0.0 N/A N/A 4.6 9.8 5.2 N/A N/A 4.6 12.5 7.6
* 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 Table 1 or 3.
† Insulation thickness based on R value of 3.5 per in.
987MA

10
MAXIMUM EQUIVALENT VENT LENGTH -- FT. (M)
NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows.
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 VENTILATED COMBUSTION AIR ONLY
Vent Pipe Diameter (in.)
1-1/2 22-1/2 3 4
0 to 2000
(0 to 610)
60,000 55 (16.8) 135 (41.1) 235 (71.6) 265 (80.8) NA
80,000 35 (10.7) 130 (39.6) 175 (53.3) 235 (71.6) 265 (80.8)
100,000 NA 50 (15.2) 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)
60,000 45 (13.7) 127 (38.7) 222 (67.7) 250 (76.2) NA
80,000 30 (9.1) 90 (27.4) 165 (50.3) 222 (67.7) 249 (75.9)
100,000 NA 40 (12.2) 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)
60,000 40 (12.2) 119 (36.3) 210 (64.0) 235 (71.6) NA
80,000 25 (7.6) 85 (25.9) 155 (47.2) 210 (64.0) 232 (70.7)
100,000 NA 40 (12.2) 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)
60,000 35 (10.7) 115 (35.1) 204 (62.2) 228 (69.5) NA
80,000 23 (7.0) 85 (25.9) 150 (45.7) 202 (61.6) 224 (68.3)
100,000 NA 40 (12.2) 94 (28.7) 205 (62.5) 229 (69.8)
120,000 NA NA NA 83 (25.3) 217 (66.1)
* See notes at end of venting tables.
*See Table 3 for altitudes over 4500 ft. (1370 M)
Long Medium Mitered
Concentric
Standard
ELBOW CONFIGURATIONS VENT TERMINAL CONFIGURATIONS
A11580
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) 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)
Concentric Vent Termination NA 0(0.0) NA 0(0.0) NA
Standard Vent Termination 0(0.0) 0(0.0) 0(0.0) 0(0.0) 0(0.0)
Venting System Length Calculations
The maximum length for each vent pipe (inlet or exhaust) equals the Maximum Equivalent Vent Length (MEVL) from Table 1 or Table 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.
See Vent Manufacturers’ data for equivalent lengths of flexible vent piping.
DO NOT ASSUME that one foot of flexible vent pipe is equivalent to one foot of standard PVC vent pipe.
987MA

11
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)
No deduction for Concentric Vent Kit 0 ft. =- 0 ft. (From Table 2)
Maximum Vent Length =115 ft. For EACH vent or inlet pipe
NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows.
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. (0 to 1370 M) Altitude
Altitude
FT (M) Unit Size
DIRECT VENT (2-PIPE) AND VENTILATED COMBUSTION AIR ONLY
Vent Pipe Diameter
1-1/2 22-1/2 3 4
4501 to 5000
(1370 to
1524)
60,000 35 (10.7) 111 (33.8) 198 (60.4) 221 (67.4) NA
80,000 23 (7.0) 85 (25.9) 146 (44.5) 195 (59.4) 216 (65.8)
100,000 NA 40 (12.2) 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)
60,000 37 (11.3) 103 (31.4) 186 (56.7) 207 (63.1) NA
80,000 22 (6.7) 76 (23.2) 137 (41.8) 183 (55.8) 200 (61.0)
100,000 NA 33 (10.1) 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)
60,000 35 (10.7) 96 (29.3) 174 (53.0) 194 (59.1) NA
80,000 20 (6.1) 71 (21.6) 120 (36.6) 171 (52.1) 185 (56.4)
100,000 NA 31 (9.4) 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)
60,000 32 (9.8) 89 (27.1) 163 (49.7) 181 (55.2) NA
80,000 18 (5.5) 66 (20.1) 120 (36.6) 159 (48.5) 170 (51.8)
100,000 NA 29 (8.8) 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)
60,000 30 (9.1) 82 (25.0) 152 (46.3) 168 (51.2) NA
80,000 17 (5.2) 62 (18.9) 111 (33.8) 148 (45.1) 156 (47.5)
100,000 NA 27 (8.2) 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)
60,000 27 (8.2) 76 (23.2) 142 (43.3) 156 (47.5) NA
80,000 15 (4.6) 57 (17.4) 103 (31.4) 137 (41.8) 142 (43.3)
100,000 NA 24 (7.3) 62 (18.9) 147 (44.8) 157 (47.9)
120,000 NA NA NA 51 (15.5) 153 (46.6)
Notes:
1. Use only the vent pipe sizes shown for each furnace. It is NOT necessary to choose the smallest diameter pipe possible for venting.
2. NA --- Not allowed. Pressure switch will not close, or flame disturbance may result.
3. Vent sizing for Canadian installations over 4500 ft. (1370 M) above sea level are subject to acceptance by the local authorities having jurisdiction.
4. Size both the combustion air and vent pipe independently, then use the larger size for both pipes.
5. Assume the two 45_elbows equal one 90_elbow. Wide radius elbows are desirable and may be required in some cases.
6. Elbow and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
7. The minimum pipe length is 5 ft. (1.5 M) linear feet (meters) for all applications.
8. Use 3---in. (76 mm) diameter vent termination kit for installations requiring 4 ---in. (102 mm) diameter pipe.
987MA

12
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
VENTILATED COMBUSTION--AIR PIPE FOR ATTIC / CRAWLSPACE APPLICATIONS
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
NOTE: See Installation Instructions for specific venting configurations.
987MA

13
DOWNFLOW SUBBASE
LOCATING
TAB
LOCATING
TAB
1234
4321
B
D
C
A
1
1
/4-IN. TYP
PLENUM
OPENING
FACTORY-SUPPLIED
FIELD-INSTALLED
INSULATION
Assembled Disassembled
A97427 A88207
DIMENSIONS (IN. / MM)
FURNACE
CASING WIDTH
FURNACE IN DOWNFLOW
APPLICATION
PLENUM OPENING* FLOOR OPENING HOLE NO. FOR
WIDTH
ADJUSTMENT
A B C D
17---1/2 (444.5) Furnace with or without Cased Coil
Assembly or Coil Box
15---1/8
(384.2) 19 (482.6) 16---3/4 (425.5)
20---3/8
(517.5) 3
21 (533.4) Furnace with or without Cased Coil
Assembly or Coil Box
18---5/8
(396.4) 19 (482.6) 20---1/4 (514.4)
20---3/8
(517.5) 2
24---1/2 (622.3) Furnace with or without Cased Coil
Assembly or Coil Box
22---1/8
(562.0) 19 (482.6) 23---3/4 (603.3)
20---3/8
(517.5) 1
*The plenum should be constructed 1/4---in. (6 mm) smaller in width and depth than the plenum dimensions shown above.
Concentric Vent Kit
A93086
A concentric vent kit allows vent and combustion--air pipes to
terminate through a single exit in a roof or side wall. One pipe
runs inside the other allowing venting through the inner pipe and
combustion air to be drawn in through the outer pipe.
Downflow Subbase
A88202
One base fits all furnace sizes. The base is designed to be installed
between the furnace and a combustible floor when no coil box is
used or when a coil box other than a Bryant cased coil is used. It is
CSA design certified for use with Bryant branded furnaces when
installed in downflow applications.
987MA

14
MEDIA FILTER CABINET
Media Filter
Cabinet AB
16" (406mm)
20" (508mm)
24" (610mm)
17" (432mm)
Furnace Side
Centerline Screw Slots
23-3/4”
23-3/8”
23-5/8"
5
34
Duct Side
Opening
Opening with Flanges Bent
24-1/4”
25-5/8"
B Opening
A
"
(600mm)
(594mm)
(603mm)
(146mm)
(651mm)
(616mm)
23-1/8”
(588mm)
16" (406mm)
20" (508mm)
24" (610mm)
21" (533mm)
25" (635mm)
A11456
TYPICAL WIRING SCHEMATIC
115-VOLT FIELD-
SUPPLIED
FUSED
DISCONNECT
JUNCTION
BOX
24-VOLT
TERMINAL
BLOCK
THREE-WIRE
HEATING-
ONLY
FIVE
WIRE
NOTE 2
NOTE 1
1-STAGE
THERMOSTAT
TERMINALS
FIELD-SUPPLIED
FUSED DISCONNECT
CONDENSING
UNIT
FURNACE
COM
R
WCY RG
GND
GND
FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING
Connect Y/Y2-terminal as shown for proper operation.
Some thermostats require a "C" terminal connection as shown.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
208/230- OR
460-VOLT
THREE
PHASE
208/230-
VOLT
SINGLE
PHASE
WHT
BLK
WHT
BLK
W/W1
W2
Y/Y2
G
NOTES: 1.
2.
3.
BLOWER
DOOR
SWITCH
C
O
N
T
R
O
L
A11401
987MA

15
DIMENSIONAL DRAWING
A11607
987MA

16
GUIDE SPECIFICATIONS
General
System Description
Furnish a ______________________ 4--way multipoise
modulating gas--fired condensing furnace for use with natural gas
or propane (factory-- authorized conversion kit required for
propane); furnish cold air return plenum; furnish external media
cabinet for use with accessory media filter or standard filter.
Quality Assurance
Unit will be designed, tested and constructed to the current ANSI Z
21.47/CSA 2.3 design standard for gas--fired central furnaces.
Unit will be third party certified by CSA to the current ANSI Z
21.47/CSA 2.3 design standard for gas--fired central furnaces. Unit
will carry the CSA Blue StarRand Blue FlameRlabels. Unit
efficiency testing will be performed per the current DOE test
procedure as listed in the Federal Register.
Unit will be certified for capacity and efficiency and listed in the
latest AHRI Consumer’s Directory of Certified Efficiency Ratings.
Unit will carry the current Federal Trade Commission Energy
Guide efficiency label.
Delivery, Storage, and Handling
Unit will be shipped as single package only and is stored and
handled per unit manufacturer’s recommendations.
Warranty (for inclusion by specifying engineer)
U.S. and Canada only. Warranty certificate available upon request.
Equipment
Blower Wheel and ECM Blower Motor
Galvanized blower wheel shall be centrifugal type, statically and
dynamically balanced. Blower motor of ECM type shall be
permanently lubricated with sealed ball bearings, of _______hp,
and have infinitely variable speed from 300--1300 RPM operating
only when motor inputs are provided. Blower motor shall be direct
drive and soft mounted to the blower scroll to reduce vibration
transmission.
Filters
Furnace shall have reusable--type filters. Filter shall be ______ in.
(mm) X ________ in. (mm). An accessory highly efficient Media
Filter is available as an option. _____________ Media Filter.
Casing
Casing shall be of .030 in. thickness minimum, pre--painted
galvanized steel.
Draft Inducer Motor
Draft inducer motor shall be variable--speed design.
Primary Heat Exchangers
Primary heat exchangers shall be 3--Pass corrosion--resistant
aluminized steel of fold--and--crimp sectional design and applied
operating under negative pressure.
Secondary Heat Exchangers
Secondary heat exchangers shall be of a stainless steel
flow--through of fin--and--tube design and applied operating under
negative pressure.
Controls
Controls shall include a micro--processor--based integrated
electronic control board with at least 16 service troubleshooting
codes displayed via diagnostic flashing LED light on the control, a
self--test feature that checks all major functions of the furnace, and
a replaceable automotive--type circuit protection fuse. Multiple
operational settings available including separate blower speeds for
all modulating capacities, low cooling, high cooling and
continuous fan. Continuous fan speed may be adjusted from the
thermostat. Cooling airflow will be selectable between 325 and
400 CFM per ton of air conditioning. Features will also include
temporary reduced airflow in the cooling mode for improved
dehumidification when an Evolution Control or T6--PRH is
selected as the thermostat.
Operating Characteristics
Heating capacity shall be _________________ Btuh input;
______________ Btuh output capacity.
Fuel Gas Efficiency shall be __________ AFUE.
Air delivery shall be ________________ cfm minimum at 0.50 in.
W.C. external static pressure.
Dimensions shall be: depth_________in. (mm); width
__________in. (mm); height___________in. (mm) (casing only).
Height shall be _________in. (mm) with A/C coil and
_________________in. (mm) overall with plenum.
Electrical Requirements
Electrical supply shall be 115 volts, 60 Hz, single--phase (nominal).
Minimum wire size shall be ________AWG; maximum fuse size
of HACR--type designated circuit breaker shall be _________
amps.
Special Features
Refer to section of the product data identifying accessories and
descriptions for specific features and available enhancements.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
E2012 Bryant Heating & Cooling Systems D7310 W. Morris St. DIndianapolis, IN 46231 Printed in U.S.A. Edition Date: 01/12
Replaces: PDS987MA---03
Catalog No. PDS987M
A
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987MA