Reznor SC User manual

Revision: SC-TSL (07-23) REV-0
TECHNICAL SPECIFICATIONS FOR MODEL SC
Supersedes: — (Original Version)
GAS-FIRED, INDOOR, COMMERCIAL/INDUSTRIAL,
SEPARATED-COMBUSTION DUCT FURNACE
TABLE OF CONTENTS
Unit Sizes ............................................................................. 2
Features .............................................................................. 2
Factory-Installed Options ................................................................. 2
Field-Installed Options ................................................................... 3
Technical Data ......................................................................... 3
Certification ........................................................................... 4
Installation Codes....................................................................... 4
Unit Location .......................................................................... 4
Separated Combustion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Hazards of Chlorine ..................................................................... 5
Venting/Combustion Air Requirements ...................................................... 5
Ductwork Requirements.................................................................. 5
Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Weights .............................................................................. 7
Clearances ............................................................................ 7
Duct Furnace Airflow .................................................................... 7
In keeping with our policy of continuous product improvement, we reserve the right
to alter, at any time, the design, construction, dimensions, weights, etc., of equipment
information shown here.

2SC-TSL (07-23) REV-0
TECHNICAL SPECIFICATIONS—CONTINUED
Unit Sizes
These duct furnaces are available in ten unit sizes based on 100,000–400,000 BTUh input.
Features
• 115V supply
• 80% thermal efficient
• Aluminized-steel burner with SST insert
• Aluminized-steel heat exchanger
• Intermittent spark pilot
• Single-stage combination gas valve (standard)
• Natural gas or propane
• 115V venter motor with SST shaft
• Fan control and high limit safety control
• 24V control transformer
• May be packaged with a blower unit to create a customized air handling system
Factory-Installed Options
Option Description
AA1 Natural gas
AA2 Propane
AB1 Installation elevation of 0–2000 feet
AB2 Installation elevation of 2001–3000 feet
AB3 Installation elevation of 3001–4000 feet
AB4 Installation elevation of 4001–5000 feet
AB5 Installation elevation of 5001–6000 feet
AB6 Installation elevation of 6001–7000 feet
AC1 Aluminized-steel heat exchanger
AC2 409 SST heat exchanger
AD1 Aluminized-steel burner
AD2 409 SST burner
AE1 No burner air shutters
AE2 Burner air shutters (required on propane units)
AF1 Aluminized-steel drip pan/bottom panel
AF2 409 SST drip pan/bottom panel
AGA US installation rating plate
AG1 Single-stage combination gas valve
AG2 Two-stage combination gas valve
AG3 Two-stage combination gas valve with unit-mounted ductstat
AG8 Electronic modulation with ductstat
AG15 Two-stage combination gas valve with electronic ductstat and remote temperature selector
AG21 Electronic modulation with Maxitrol signal conditioner
AG39 Electronic modulation with 4:1 turndown ratio and remote temperature selector (natural gas units)
AG40 Electronic modulation with 4:1 turndown ratio and DDC interface (natural gas units)
AH2 Intermittent spark pilot
AH3 Intermittent spark pilot with timed lockout
AJ1 Left side controls (facing airstream)
AJ2 Right side controls (facing airstream)
AK1 115/1/60 voltage
AK2 208/1/60 voltage
AK3 230/1/60 voltage
AK9 460/1/60 voltage

3
SC-TSL (07-23) REV-0
Field-Installed Options
Option Description
AG7 Electronic modulation with room thermostat
AG9 Electronic modulation with ductstat and remote temperature selector
CC2 Vertical vent terminal
CC6 Horizontal vent terminal
CE1 Manual shutoff valve, natural gas
CE2 Manual shutoff valve, propane
CL1 Single-stage thermostat
CL9 Electronic modulating room override
CL22 Two-stage thermostat
CL33 Two-stage digital thermostat
CL52 Single-stage digital thermostat
CM1 Locking cover for CL1 thermostat
CM1B Locking cover for CL22 and CL33 thermostats
CP2, CP3, CP4 Indoor disconnect switches (US only)
CP41 Indoor disconnect switch (Canada only)
CS1 Condensate drain flange
SA1 Photoelectric air duct smoke detector
Parameter Unit of
Measure
Unit Size
100 125 150 175 200 225 250 300 350 400
Input heating
capacity
BTUh 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000
kW 29.3 36.6 44.0 51.3 58.6 65.9 73.3 87.9 102.6 117.2
Output heating
capacity (80%)
BTUh 80,000 100,000 120,000 140,000 160,000 180,000 200,000 240,000 280,000 320,000
kW 23.4 29.3 35.2 41.0 46.9 52.8 58.6 70.3 82.1 93.8
Air volume
with finger-
baffles
CFM 820–1480 1025–
1850
1235–
2200
1440–
2590
1645–
2960
1850–
3330
2055–
3700
2465–
4440
2880–
5185
3290–
5925
meter3/hr 1393–
2514
1741–
3143
2098–
3738
2446–
4400
2795–
5029
3143–
5657
3491–
6286
4188–
7543
4893–
8809
5590–
10,066
Air volume
without finger-
baffles*
CFM 985–3700 1230–
4630
1480–
5555
1725–
6480
1975–
7405
2020–
8330
2465–
9255
2960–
11,110
3455–
12,960
3950–
14,815
meter3/hr 1673–
6286
2090–
7866
2514–
9438
2931–
11,009
3355–
12,581
3432–
14,152
4188–
15,724
5029–
18,875
5870–
22,018
6711–
25,170
Temperature
rise °F 50–90
20–75*
Gas
connection,
natural gas inch
1/2 3/4
Gas
connection,
propane
1/2
Full load amps
(120V) amp
1.9
Unit control
amps (24V) 0.83
*High CFM conversion requires removal of the finger baffles. This conversion shall be done by a qualified service agency in accordance with
the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction.
Technical Data
Option Description
BG3A–BG3Z Various relay options
BP4 High- and low-pressure gas pressure safety switches
BW1 Air flow pressure proving switch
CGA Canadian installation rating plate
CN1A–CN3Z Various remote switch options

4SC-TSL (07-23) REV-0
TECHNICAL SPECIFICATIONS—CONTINUED
Certification
These gas-fired products are certified by ANSI Z83 family of standards governing the safe usage of heating equipment
in the industrial/commercial marketplace. This includes using the heaters in makeup air applications to supply corridor
pressurization in commercial buildings such as office structures and apartment complexes. The heaters are not
certified as residential heating equipment and should not be used as such.
Installation Codes
• These units must be installed in accordance with local building codes. In the absence of local codes, in the United
States, the unit must be installed in accordance with the National Fuel Gas Code NFPA/ANSI Z223.1 (latest edition).
A Canadian installation must be in accordance with the CSA B149.1 Natural Gas and Propane Installation Code.
This code is available from CSA Information Services, 1-800-463-6727. Local authorities having jurisdiction should
be consulted before installation is made to verify local codes and installation procedure requirements.
• Clearances from the heater and vent to combustible construction or material in storage must conform with the
National Fuel Gas Code ANSI Z223.1 (latest edition) pertaining to gas-burning devices, and such material must
not attain a temperature over 160°F (71°C) by continued operation of the heater.
• Special installations (aircraft hangars/garages): Installations in aircraft hangars should be in accordance with
NFPA No. 409 (latest edition), Standard for Aircraft Hangars, in public garages in accordance with NFPA No. 88A
(latest edition), Standard for Parking Structures, and for repair garages in accordance with NFPA No. 88B (latest
edition), Standard for Repair Garages. In Canada, installations in aircraft hangars, repair garages, and parking
garages should be in accordance with the requirements of the enforcing authorities and in accordance with CSA
B149 codes.
Unit Location
⚠ CAUTION ⚠
Do not locate the unit where it may be exposed to liquid spray, rain, or dripping water.
• A duct furnace is designed for connection to an inlet and an outlet duct and depends on an external air handler.
The location must comply with the Clearances section. There are a variety of factors, such as system application,
building structure, dimensions, and weight, that contribute to selecting the location. Read the installation manual
and select a location that complies with the requirements.
• For best results, the heater should be placed with certain rules in mind. In general, a unit should be located from
8–12 feet (2.6–3.6 meters) above the floor. Units should always be arranged to blow toward or along exposed wall
surfaces, if possible. Where two or more units are installed in the same room, a general scheme of air circulation
should be maintained.
• Suspended heaters are most effective when located as close to the working zone as possible, and this fact should
be kept in mind when determining the mounting heights to be used. However, avoid directing the discharged air
directly on the room occupants.
• Partitions, columns, counters, or other obstructions should be taken into consideration when locating the unit heater,
so that a minimum quantity of airflow will be deflected by such obstacles. When units are located in the center of the
space to be heated, the air should be discharged toward the exposed walls. In large areas, units should be located
to discharge air along exposed walls with extra units provided to discharge air in toward the center of the area.
• At those points where infiltration of cold air is excessive, such as at entrance doors and shipping doors, it is
desirable to locate the unit so that it will discharge directly toward the source of cold air from a distance of 15–20
feet (4.5–6 meters).

5
SC-TSL (07-23) REV-0
Separated Combustion
• This separated-combustion unit is designed and manufactured in accordance with the ANSI definition of separated
combustion, which reads, “Separated Combustion System Appliance: A system consisting of an appliance and
a vent cap(s) supplied by the manufacturer, and (1) combustion air connections between the appliance and the
outside atmosphere, and (2) flue gas connections between the appliance and vent cap, of a type(s) specified by the
manufacturer but supplied by the installer, constructed so that, when installed in accordance with the manufacturer’s
instructions, air for combustion is obtained from the outside atmosphere and flue gases are discharged to the
outside atmosphere.”
• Separated-combustion units are designed to separate air for combustion and flue products from the environment
of the building in which the unit is installed. Separated-combustion appliances are recommended for use in dust-
laden and some corrosive-fume environments.
Hazards of Chlorine
⚠ WARNING ⚠
SC series separated-combustion units are not designed or approved for use in atmospheres
containing flammable vapors or atmospheres highly-laden with chlorinated vapors.
NOTE: Remember, chlorine is heavier than air. This fact should be kept in mind when determining
the installation location of heaters and building exhaust systems.
The presence of chlorine vapors in the combustion air of heating equipment presents a potential corrosion hazard.
Chlorine, found usually in the form of Freon or degreaser vapors, when exposed to flame will precipitate from the
compound and form a solution with any condensation present in the heat exchanger or associated parts. The result
is hydrochloric acid, which readily attacks all metals, including 300 grade stainless steel. Care should be taken to
separate these vapors from the combustion process. This may be done by wise location of the unit with regard to
exhausters or prevailing wind directions.
Venting/Combustion Air Requirements
⚠ WARNING ⚠
Do not use an existing venting system. This heater requires installation of the combustion air/vent
system ordered with the unit (either option CC2 or CC6). Vent installation to be any listed vent
system manufacturer. Do not intermix different vent system parts from different manufacturers
in the same venting system.
• All separated-combustion, power-vented units MUST BE equipped with both combustion air and exhaust piping
to the outdoors. The unique concentric adapter box designed for use with this heater allows for both combustion
air and exhaust piping with only one horizontal or vertical penetration hole in the building.
• Installation should be done by a qualified agency in accordance with the instructions. The service agency installing
this separated-combustion system is responsible for the installation. Refer to the installation manual for further
information on ventin/combustion air requirements.
Ductwork Requirements
⚠ CAUTION ⚠
Joints where ducts attach to furnace must be sealed securely to prevent air leakage into burner
rack area. Leakage can cause poor combustion, poor performance, and pilot problems and can
shorten heat exchanger life.
NOTE: Make adjustments to ductwork as necessary to obtain a temperature rise and static pressure
within the ranges specified on the heater rating plate.
Refer to the installation manual for further information on ductwork requirements.

6SC-TSL (07-23) REV-0
TECHNICAL SPECIFICATIONS—CONTINUED
Dimensions
SIDE VIEWREAR (SUPPLY AIR) VIEW
1 (25)
3/4 (19)
5-7/8
(149)
4-13/16 (122)
12-23/32 (323)
1-1/8 (29)
2-13/16 (71)
2-19/32 (66)
2 (51)
6-3/32
(155)
2-3/4 (70)
4-9/16 (116)
COMBUSTION AIR
INLET (6 (152) ID)
11-9/16
(294)
VENT CONNECTION
(6 (152) OD)
GAS CONNECTION
12-9/16
(319)
7-1/2
(191)
1-1/8 (29)
3/4
(19)
3/4
(19)
3/4 (19) 26 (660)
24-1/8
(613)
1-1/2 (38)
7-7/32 (183)
18 (457)
ELECTRICAL
CONNECTIONS
TOP VIEW
15/16 (24)
FREE-TURNING
MOUNTING
SOCKETS
(1 IPS FEM PIPE
THREAD)
NOTES:
Inches (mm)
Standard airflow may be reversed by changing
direction of heat exchanger air baffles.
Burner and control access shown left-hand
side. Specify right-hand side for opposite
access and connections.
Dimension
(See Graphic
Above)
Unit Size
100 125 150, 175 200, 225 250, 300 350 400
Inches (mm)
A 32-1/4 (819) 35-1/4 (895)
B 22-15/32 (571) 25-7/32 (641) 30-23/32 (780) 36-7/32 (920) 44-15/32 (1130) 49-31/32 (1269) 55-15/32 (1409)
D 12-1/2 (318) 15-1/4 (387) 20-3/4 (527) 26-1/4 (667) 34-1/2 (876) 40 (1016) 45-1/2 (1156)
E 8-1/8 (206) 10-3/4 (273)
F 13-9/16 (344) 16-15/16 (430) 21-13/16 (554) 27-5/16 (694) 35-9/16 (903) 41-1/16 (1043) 46-9/16 (1183)
G 6-15/16 (176) 9-15/16 (252)

7
SC-TSL (07-23) REV-0
Clearances
Clearance to combustibles is defined as the minimum distance—from the heater to a surface or object—that is
necessary to ensure that a surface temperature of 90°F (50°C) above the surrounding ambient temperature is not
exceeded. For safety and convenience, ensure that clearances are as follows:
Type
Unit Size
100 125 150, 175 200, 225 250, 300 350 400
Net Weight (Pounds (kg))
Unit 158 (72) 178 (81) 203 (92) 283 (128) 321 (146) 350 (159) 410 (186)
Shipping 184 (83) 204 (93) 244 (111) 314 (142) 354 (161) 384 (174) 447 (203)
Weights
Unit Surface Minimum Clearance (Inches (mm))
Top 6 (152)
Control side 6 (152) + width of unit
Side opposite controls 6 (152)
Bottom, to combustibles 6 (152)
Bottom, to noncombustibles 0 (0)
Duct Furnace Airflow
The duct furnace must be installed on the positive pressure side of the field-supplied blower. Air throughput must
be within the CFM range stated on the heater rating plate. The air distribution must be even over the entire heat
exchanger. To determine temperature rise, the inlet and outlet air temperatures should be measured at points not
affected by heat radiating from the heat exchanger. Refer to the following table section for the approved temperature
rise range with the required CFM and the internal pressure drop for each size of unit. Refer to the installation manual
for suggested blower connections that include turning vanes used in elbows or turns in the air inlet to ensure proper
air distribution. If it is determined that the blower CFM is greater than that which is allowed or desirable, refer to the
installation manual for instructions on determining the correct size of bypass duct required.
Temp-
erature
Rise
Unit Size
100 125 150 175 200 225 250 300 350 400
CFM/Pressure Drop (IN WC)
80% Thermal Efficient
50°F 1480/0.50 1850/0.50 2220/0.36 2590/0.52 2960/0.41 3330/0.53 3700/0.42 4440/0.58 5185/0.67 5925/0.67
55°F 1345/0.34 1680/0.41 2020/0.30 2355/0.43 2690/0.34 3030/0.44 3365/0.35 4040/0.48 4710/0.55 5385/0.55
60°F 1235/0.29 1540/0.34 1850/0.26 2160/0.36 2465/0.28 2775/0.37 3085/0.30 3700/0.40 4320/0.46 4935/0.46
70°F 1055/0.21 1320/0.25 1585/0.19 1850/0.26 2115/0.21 2380/0.27 2645/0.22 3175/0.30 3700/0.34 4230/0.34
80°F 925/0.16 1155/0.19 1385/0.14 1620/0.20 1850/0.17 2080/0.21 2315/0.20 2775/0.23 3240/0.26 3700/0.26
85°F 870/0.14 1085/0.18 1305/0.13 1525/0.18 1740/0.15 1960/0.19 2175/0.20 2610/0.22 3050/0.23 3485/0.23
90°F 820/0.12 1025/0.16 1235/0.12 1440/0.16 1645/0.13 1850/0.17 2055/0.18 2465/0.20 2880/0.21 3290/0.21
With Finger Baffles Removed
20°F 3700/1.08 4630/1.12 5555/0.85 6480/1.11 7405/1.02 8330/1.24 9255/0.90 11,110/1.24 12,960/1.24 14,815/1.24
30°F 2465/0.48 3085/0.50 3700/0.38 4320/0.50 4935/0.45 5555/0.55 6170/0.40 7405/0.55 8640/0.55 9875/0.55
40°F 1850/0.27 2315/0.28 2775/0.21 3240/0.28 3700/0.25 4165/0.31 4630/0.22 5555/0.31 6480/0.31 7405/0.31
50°F 1480/0.17 1850/0.18 2220/0.14 2590/0.18 2960/0.16 3330/0.20 3700/0.14 4440/0.20 5185/0.20 5925/0.20
60°F 1230/0.13 1540/0.13 1850/0.11 2160/0.14 2465/0.12 2775/0.15 3085/0.11 3700/0.15 4320/0.15 4935/0.15
70°F 1055/0.10 1320/0.11 1585/0.10 1850/0.13 2115/0.10 2380/0.11 2645/0.09 3170/0.11 3700/0.11 4230/0.11
75°F 985/0.09 1230/0.10 1480/0.09 1725/0.11 1975/0.09 2220/0.10 2465/0.08 2960/0.10 3455/0.10 3950/0.10

Specifications and illustrations subject to change without notice or incurring obligations.
Latest version of this document is available at www.reznorhvac.com.
©2023 Nortek Global HVAC LLC, O’Fallon, MO. All rights reserved.
SC-TSL (07-23) REV-0
For more information on Reznor HVAC products:
• Contact your local Reznor representative at 1-800-695-1901
• Refer to the manuals and additional consumer materials found at
www.reznorhvac.com
⚠ DANGER ⚠
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could result in serious injury, death, or property
damage.
• Improper installation, adjustment, alteration, service, or maintenance can cause serious
injury, death, or property damage.
• Installation and service must be performed by a qualified installer, service agency, or the
gas supplier.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a phone remote from the building. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
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