912SC 92.1 AFUE
LEGACYt LINE SINGLE--STAGE
4--WAY MULTIPOISE
CONDENSING GAS FURNACE, SERIES A
Product Data
A11264
The 912S Multipoise Condensing Gas Furnace is part of the
Legacyt Line product offering. Sporting a PSC blower motor
and an Annual Fuel Utilization Efficiency (AFUE) of 92.1%, this
single-stagegasfurnaceprovidesefficientcomfortfor
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 BryantR Air
Conditioner or Heat Pump can be used to form a complete system.
All units meet California Air Quality Management District
emissionrequirements.These furnaces are approvedfor
Manufactured Housing (Mobile Home) applications. All sizes are
design certified in Canada.
STANDARD FEATURES
S 4-way multipoise design for upflow, downflow or horizontal
installation.
S Optional through-the-cabinet downflow venting.
S Installation flexibility with a 360-degree rotating elbow.
S Ideal condensing furnace height 35” cabinet: short enough for
taller coils, but still allows enough room for service.
S Silicon Nitride Perfect Lightt Hot Surface Igniter.
S Aluminized-steel primary heat exchanger.
S Stainless-steel condensing secondary heat exchanger.
S High-quality corrosion-resistant prepainted steel cabinet with
hemmed edges for safety.
S Factory-configured ready for upflow applications.
S Direct-vent/sealed combustion, single-pipe venting or ventilated
combustion air.
S PSC blower motor, single-speed inducer motor, and single-stage
gas valve.
S Self-diagnostics
S Approved for Twinning applications (36060 through 60120
sizes, only).
S Propane convertible (See accessory list).
S Approved for Manufactured Housing/Mobile Home applications
with MH accessory kit.
S Convenient Air Purifier and Humidifier electrical connections.
S Residential installations may be eligible for consumer financing
through the Retail Credit Program.
S Certified 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.
† 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
(IN.)
HDW(BTUH)AFUECFM‡
RATED
HEATING
OUTPUT†
HEATING
AIRFLOW
Heating
ESP
(in. W.C.)
COOLING CFM @ 0.5 ESP
(in. W.C.)
MOTOR HP -
SPEED TAPS
FEATURES AND BENEFITS
HYBRID HEATR Dual Fuel system — This system can provide
912SC
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 Heatt Igniter — 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.
2
Page 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
Heating Capacity and Efficiency300403604036060480604808060080481006010060120
Input
Output
Certified Temperature
Rise Range ºF (ºC)
Airflow Capacity and Blower Data300403604036060480604808060080481006010060120
Rated External Static
Pressure (in. W.C.)
Airflow Delivery
@ Rated ESP (CFM)
Cooling Capacity (tons)
Direct-Drive Motor TypePermanent Split Capacitor (PSC)
Direct-Drive Motor HP0.30.50.30.50.50.750.50.750.75
Motor Full Load Amps4.66.84.67.97.47.96.511.111.1
RPM Range500 - 1150
Speed Selections454455444
Blower Wheel Dia x Widthin.11 x 711 x 811 x 711 x 811 x 811 x 1011 x 1011 x 1011 x 11
Air Filtration SystemField Supplied
Filter Used for Certified Watt Data*KGAWF**06UFR
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.
Input VoltageVolts-Hertz-Phase115-60-1
Operating Voltage RangeMin-Max104-127
Maximum Input AmpsAmps5.27.45.38.68.18.67.311.911.9
Unit AmpacityAmps7.510.37.611.711.111.710.115.815.8
Minimum Wire SizeAWG141414141414141212
Maximum Wire Length
@ Minimum Wire Size
Maximum Fuse/Ckt Bkr
(Time-Delay Type Recommended)
Transformer Capacity (24vac output)40 VA
External Control Power
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 --- authorized 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 TH E 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 ar e shown in BOLD exceed 0.58 watts per CFM at the given external static pressure.
6
Page 7
Winter
Design
Temp
°F
MAXIMUM ALLOWABLE EXPOSED VENT LENGHT INSULATION TABLE
Table 1 – Maximum Allowable Exposed Vent Length in Unconditioned Space -- Ft.
Unit Size40,000* BTUH60,000 BTUH
Pipe Dia.
in.
20202020205045206050203030252075656020857565
01055202520203025151510102040302520454030
-2052015102020151052025201520302520
-401510515151052015151020201510
Uninsulated
1½22½ 1½22½ 1½22½1½22½31½22½31½22½3
3/8-in. Insulation1/2-in. Insulation
Uninsulated3/8-in. Insulation1/2-in. Insulation
Winter
Design
Temp
°F
Winter
Design
Temp
°F
Winter
Design
Temp
°F
Unit Size80,000 BTUH
Pipe Dia.
in.
20154040353015509075651550707070
015201510515504535301550504035
-201510515353020151540302515
-401051525201551530252010
Unit Size100,000 BTUH
Pipe Dia.
in.
202050403520809580208010590
0202015102055453520655545
-20151052035302020453525
-401052025201020302515
Unit Size120,000 BTUH140,000 BTUH
Pipe Dia.
in.
20105040107595107510555550565105565125
0102015105545106550525155655056560
-20101010352510453051055453055040
-40105102515103020555302053525
1½22½341½22½341½22½34
22½3422½3422½34
Uninsulated
2½342½342½342½342½342½34
Uninsulated3/8-in. Insulation1/2-in. Insulation
Uninsulated3/8-in. Insulation1/2-in. Insulation
3/8-in. Insulation1/2-in. Insulation
Uninsulated3/8-in. Insulation1/2-in. Insulation
Maximum Allowable Exposed Vent Length in Unconditioned Space -- Meters
Standard 2-in., 3-in., or
optional 4-in. termination.
A13110
Table 3 – Deductions from Maximum Equivalent Vent Length -- Ft. (M)
Pipe Diameter (in):1-1/222-1/234
Mitered 90º Elbow8(2.4)8(2.4)8(2.4)8(2.4)8(2.4)
Medium Radius 90º Elbow5(1.5)5(1.5)5(1.5)5(1.5)5(1.5)
Long Radius 90º Elbow3(0.9)3(0.9)3(0.9)3(0.9)3(0.9)
Mitered 45º Elbow4(1.2)4(1.2)4(1.2)4(1.2)4(1.2)
Medium Radius 45º Elbow2.5(0.8)2.5(0.8)2.5(0.8)2.5(0.8)2.5(0.8)
Long Radius 45º Elbow1.5(0.5)1.5(0.5)1.5(0.5)1.5(0.5)1.5(0.5)
Tee16(4.9)16(4.9)16(4.9)16(4.9)16(4.9)
8
Page 9
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:
Add equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of (2) 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of vent termination0ft.From Table 3
Add correction for flexible vent pipe, if any0ft.
Total Equivalent Vent Length (TEVL)112 ft.Add all of the above lines
Maximum Equivalent Vent Length (MEVL)127 ft.For 2” pip e from T able 2
Is TEVL less than MEVL?YESTherefore, 2” pipe may be used
3x3ft=9ft.From Table 3
2x1.5 ft=3ft.From T able 3
100 ft
Use length of the longer of the vent
or air inlet piping system
From Vent Manufacturer’s instructions;
zero for PVC/ABS DWV
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:
Add equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of (2) 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of vent termination9M x3ft/M=18 ft.From Vent Manufacturer’s instructions
Add correction for flexible vent pipe, if any1.8x20 ft=36 ft.From Vent Manufacturer’s instructions
Total Equivalent Vent Length (TEVL)163 ft.Add all of the above lines
3x3ft=9ft.From Vent Manufacturer’s instructions
0x=0ft.From Vent Manufacturer’s instructions
100 ft
Use length of the longer of the vent
or air inlet piping system
912SC
Maximum Equivalent Vent Length (MEVL)127 ft.For 2” pip e from T able 2
Is TEVL less than MEVL?NO
Maximum Equivalent Vent Length (MEVL)250 ft.For 3” pip e from T able 2
Is TEVL less than MEVL?YESTherefore, 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 cl ose, 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 a n 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 BTU H input models.
5. Vent sizing for Canadian installations over 4500 f t (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 al l applications.
10. Use 3 ---in. (76 mm) diameter vent termination kit for installations requir ing 4 ---in. (102 mm) diameter pipe.
Therefore, 60mm pipe may NOT be used;
try 80 mm
9
Page 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.
80/ 27˚C
SUPPLY AIR
60
/ 16˚C
912SC
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
POSITIONCLEARANCE
Rear0(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)
Sides0(0mm)
Ve n t0(0mm)
* Recommended
**Consult your local building codes
Top of Furnace1in. (25mm)
A10490
COMBUSTION--AIR PIPE FOR NON--DIRECT (1--PIPE) VENT APPLICATION
NOTE: Not all models may be available in all casing sizes shown in the table above.
11
Page 12
DOWNFLOW SUBBASE
LOCATING
TAB
11/
4-IN. TYP
PLENUM
OPENING
A
LOCATING
TAB
B
4
3
D
2
1
FACTORY-SUPPLIED
FIELD-INSTALLED
INSULATION
C
A97427
Assembled
DIMENSIONS (IN. / MM)
FURNACE
CASING WIDTH
912SC
14--- 3/16 (360)
17--- 1/2 (445)
21 (533)
24--- 1/2 (622)
*The plenum should be constructed 1/4 ---in. (6 mm) smaller in width and depth than the plenum dimensions shown above.
FURNACE IN DOWNFLOW
APPLICATION
Furnace with or without Cased Coil
Assembly or Coil Box
Furnace with or without Cased Coil
Assembly or Coil Box
Furnace with or without Cased Coil
Assembly or Coil Box
Furnace with or without Cased Coil
Assembly or Coil Box
PLENUM OPENING*FLOOR OPENING
ABCD
11--- 3/16
(322)
15--- 1/8
(384)
18--- 5/8
(396)
22--- 1/8
(562)
19 (483)
19 (483)
19 (483)
19 (483)
13--- 7/16
(341)
16--- 3/4
(426)
20--- 1/4
(514)
23--- 3/4
(603)
Disassembled
20--- 5/8
(600)
20--- 5/8
(600)
20--- 5/8
(600)
20--- 5/8
(600)
1
2
3
4
A88207
HOLE NO. FOR
WIDTH
ADJUSTMENT
4
3
2
1
Concentric Vent Kit
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.
A93086
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.
12
Page 13
23-5/8"
(600mm)
23-3/8”
(594mm)
MEDIA FILTER CABINET
A
25-5/8"
(651mm)
24-1/4”
(616mm)
Opening with Flanges Bent
23-1/8”
(588mm)
Opening
B Opening
Furnace Side
Duct Side
23-3/4”
(603mm)
Centerline Screw Slots
3
"
5
4
(146mm)
Media Filter
Cabinet
16" (406mm)
20" (508mm)
24" (610mm)
A
17" (432mm)
21" (533mm)
25" (635mm)
NOTE: Media cabinet is matched to the bottom opening on furnace. May also be used for side return.
TYPICAL WIRING SCHEMATIC
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
FIVE WIRE
THREE-WIRE
HEATING-ONLY
BLOWER DOOR SWITCH
BLK
WHT
115-V FIELD-
SUPPLIED
BLK
WHT
GND
AUXILIARY
J-BOX
DISCONNECT
GND
FURNACE
NOTE 2
W
C
R
O
N
T
G
R
O
COM
L
Y
24-V
TERMINAL
BLOCK
WCRGY
NOTE 1
NOTES:Connect Y-terminal in furnace as shown for proper blower operation.
1.
Some thermostats require a "C" terminal connection as shown.
2.
If any of the original wire, as supplied, must be replaced, use
3.
same type or equivalent wire.
THERMOSTAT
TERMINALS
CONDENSING
UNIT
TWO
WIRE
FIELD-SUPPLIED
DISCONNECT
GND
B
16" (406mm)
20" (508mm)
24" (610mm)
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
912SC
A12428
A11387
13
Page 14
912SC
29 1/2
[749.3]
DIMENSIONAL DRAWING
20 5/8
[522.7]
21 1/16
[535.8]
[557.4]
21 15/16
26 3/8
[669.9]
[678.1]
28 3/4
[730.5]
26 11/16
AIR FLOW
3
[76.2]
1 3/4
[44.5]
AIR INTAKE
GAS CONN
E
REV
1
SHT
23 3/8
7/8
[22.2] POWER CONN
[63.5]
SIDE INLET
7/8
[101.6]
[889.0]
28 3/8
[720.4]
[757]
29 13/16
[22.2]
28 5/8
17 7/16
24
[726.9]
7/8
[442.3]
[609.7]
[22.2]
THERMOSTAT ENTRY
[420.9]
16 9/16
[458.6]
18 1/16
20 1/4
[513.9]
4
35
7/8
7/8
[22.2]
[22.2]
2 1/2
3
[76.2 ]
21 5/8
[549.5]
BOTTOM INLET
6 1/16
[154.0]
11/16
[17.5]
[592.0]
1 5/16
[668.8]
26 5/16
[33.3]
SD5024-4
PART NUMBER
NEXT SHEET
2
B
A
NOTES:
1. Doors may vary by model.
2. Minimum return-air openings at furnace, based on metal duct. If ex duct is used,
see ex duct manufacturer's recommendations for equivalent diameters.
a. For 800 CFM-16-in. (406 mm) round or 14 1/2 x 12-in. (368 x 305 mm) rectangle.
b. For 1200 CFM-20-in. (508 mm) round or 14 1/2 x 19 1/2-in. (368 x 495 mm) rectangle.
c. For 1600 CFM-22-in. (559 mm) round or 14 1/2 x 22 1/16-in. (368 x 560mm) rectangle.
d. Return air above 1800 CFM at 0.5 in. w.c. ESP on 24.5" casing, requires one of the following
congurations: 2 sides, 1 side and a bottom or bottom only. See Air Delivery table in this
document for specic use to allow for sucient airow to the furnace.
3. Vent and Combustion air pipes through blower compartment must
use accessory “Vent Kit - Through the Cabinet”. See accessory list for
Furnish a ______________________ 4--way multipoise gas--fired
condensing furnace for use with natural gas or propane (factory-authorized conversion kit required for propane).
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 StarR and Blue FlameR labels. 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 PSC Blower Motor
Galvanized blower wheel shall be centrifugal type, statically and
dynamically balanced. Blower motor of PSC type shall be
permanently lubricated with sleeve bearings, of _______hp, and
have multiple speeds from 500--1150 RPM operating only when
115--VAC motor inputs are provided. Blower motor shall be direct
drive and soft mounted to the blower housing 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 steel.
Draft Inducer
Draft inducer motor shall be single--speed PSC design.
Motor
Primary Heat
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
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 blower speeds for heating
and cooling. Continuous fan speed is the same as selected heating
speed.