Reznor SCE Owner's manual

Revision: SCE-IOM (01-22) 207697-B
MODEL SCE
INSTALLATION/OPERATION/MAINTENANCE FOR
SEPARATED-COMBUSTION PACKAGED FURNACE/BLOWER
Supersedes: I-SCE (04-21) 207697-A
⚠ 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.
• Be sure to read and understand the installation, operation, and service instructions in this
manual.
• 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.
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

2SCE-IOM (01-22) 207697-B
TABLE OF CONTENTS
GENERAL INFORMATION ............................................................................. 3
References ........................................................................................ 4
Important Safety Information........................................................................... 4
Separated Combustion ............................................................................... 5
Installation Codes ................................................................................... 5
Special Installations (Aircraft Hangars/Garages) ........................................................... 5
Warranty .......................................................................................... 5
Dimensions ........................................................................................ 5
Weights........................................................................................... 7
Clearances ........................................................................................ 7
Location .......................................................................................... 7
Hazards of Chlorine ................................................................................. 7
INSTALLATION ...................................................................................... 8
Uncrating/Unpacking................................................................................. 8
Shipped-Separate Parts .............................................................................. 8
Suspension ........................................................................................ 9
Mounting .......................................................................................... 9
Duct Connections .................................................................................. 10
Requirements and Suggestions for Connecting and Installing Ducts ........................................ 11
Venting/Combustion Air Connections ................................................................... 12
Specific Venting Requirements: Piping ............................................................... 12
Specific Venting Requirements: Venter Outlet and Combustion Air Inlet Connections........................... 13
Specific Venting Requirements: Joints and Sealing ..................................................... 13
Specific Venting Requirements: Support.............................................................. 14
Specific Venting Requirements: Clearance ............................................................ 15
Specific Venting Requirements: Concentric Adapter Box ................................................. 15
Specific Venting Requirements: Concentric Adapter Box Pipe Connections .................................. 15
Vent Terminal Options............................................................................ 16
Vertical Vent Terminal (Option CC2) Installation........................................................ 17
Horizontal Vent Terminal (Option CC6) Installation...................................................... 22
Piping Connections................................................................................. 26
Gas Supply Pressure............................................................................. 26
Gas Supply Piping............................................................................... 27
Supply Piping Connections ........................................................................ 27
Condensate Drain Installation ...................................................................... 28
Electrical Connections .............................................................................. 29
Control Wiring .................................................................................. 29
CONTROLS ........................................................................................ 30
Thermostat ....................................................................................... 30
Combustion Air Proving Switch........................................................................ 30
Blower Fan Control ................................................................................. 31
Limit Control ...................................................................................... 31
Variable Frequency Drive ............................................................................ 31
Combination Gas Valve ............................................................................. 31
Optional Two-Stage Control (Heating Only Application)..................................................... 32
Optional Two-Stage Control (Makeup Air Application) ...................................................... 32
Optional Ductstat with Capillary Tubing (Option AG3) ................................................... 32
Optional Ductstat with Electronic Remote Setpoint Module (Option AG15 or AG16) ............................ 33
Optional Electronic Modulation ........................................................................ 33
Electronic Modulation Between 50% and 100% Firing Rate (Option AG7, AG8, or AG9) ........................ 33
Computer-Controlled Electronic Modulation Between 50% and 100% Firing Rate (Option AG21).................. 34
Electronic Modulation Between 20–28% and 100% Firing Rate (Option AG39) ................................ 34
Electronic Modulation Between 20–28% and 100% Firing Rate (Option AG40) ................................ 35

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SCE-IOM (01-22) 207697-B
GENERAL INFORMATION
•This unit has been tested for capacity and efficiency so as to provide many years of safe and dependable comfort
providing it is properly installed and maintained. With regular maintenance, this unit will operate satisfactorily year
after year. Abuse, improper use, and/or improper maintenance can shorten the life of the appliance and create
unsafe hazards.
•To achieve optimum performance and minimize equipment failure, it is recommended that periodic maintenance
be performed on this unit. The ability to properly perform maintenance on this equipment requires certain tools
and mechanical skills.
•This unit has been design-certified by the Canadian Standards Association to ANSI Standards and is available
for use with either natural or propane gas. The type of gas, the rate, and the electrical characteristics are on the
unit rating plate.
TABLE OF CONTENTS—CONTINUED
Pilot and Ignition Systems............................................................................ 37
Burners, Burner Orifices, and Carryover System .......................................................... 37
Dampers and Damper Controls ....................................................................... 38
Dirty Filter Switch .................................................................................. 39
OPERATION ....................................................................................... 39
Pre-Startup Checklist ............................................................................... 39
Startup .......................................................................................... 40
Post-Startup Checklist .............................................................................. 40
ADJUSTMENTS..................................................................................... 41
Belts, Blowers, and Drives ........................................................................... 41
Checking and Adjusting Belt Tension ................................................................ 41
Adjusting Blower Speed .......................................................................... 41
Reversing Blower Rotation ........................................................................ 42
Motor Load and Amp Adjustment ...................................................................... 42
Measure and Adjust Manifold (Outlet) Gas Pressure ....................................................... 43
High Elevation (>2,000 Feet/609 Meters) Installations ................................................... 44
Conversion to LP (Propane) ....................................................................... 45
Burner Air Shutter Adjustment ........................................................................ 46
Damper Linkage Adjustment.......................................................................... 46
Dirty Filter Switch Adjustment ......................................................................... 47
MAINTENANCE..................................................................................... 48
Service Checklist .................................................................................. 48
Maintenance Procedures ............................................................................ 48
Combination Gas Valve Maintenance ................................................................ 48
Vent/Combustion Air System Maintenance ............................................................ 49
Burner Rack Maintenance......................................................................... 49
Cleaning Pilot and Burners ........................................................................ 50
Spark Ignition System Maintenance ................................................................. 51
Maintenance Procedures—Continued .................................................................. 52
Cleaning Heat Exchanger ......................................................................... 52
Venter Motor Maintenance ........................................................................ 52
Air Circulation System Maintenance ................................................................. 52
Limit Control Check .............................................................................. 52
TROUBLESHOOTING ................................................................................ 52
INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER)............................................. 56

4SCE-IOM (01-22) 207697-B
Table 1. Related Technical Manuals Available from Factory Distributor
Type Form*PN
Replacement parts SC-SCE-SSCBL-SSCDBL-RPL 269822
Vent/combustion air kit installation OPT-CC2-CC6 205892
Gas conversion OPT-GC 143147
*Also available at www.reznorhvac.com.
GENERAL INFORMATION—CONTINUED
References
Important Safety Information
Please read all information in this manual thoroughly and become familiar with the capabilities and use of your
appliance before attempting to operate or maintain this unit. Pay attention to all dangers, warnings, cautions, and
notes highlighted in this manual. Safety markings should not be ignored and are used frequently throughout to
designate a degree or level of seriousness.
DANGER: A danger statement describes a potentially hazardous situation that if not avoided, will result in severe
personal injury or death and/or property damage.
WARNING: A warning statement describes a potentially hazardous situation that if not avoided, can result in severe
personal injury and/or property damage.
CAUTION: A caution statement describes a potentially hazardous situation that if not avoided, can result in minor
or moderate personal injury and/or property damage.
NOTE: A note provides important information that should not be ignored.
⚠ DANGER ⚠
Gas-fired appliances are not designed for use in hazardous atmospheres containing flammable
vapors or combustible dust, in atmospheres containing chlorinated or halogenated hydrocarbons,
or in applications with airborne silicone substances.
⚠ WARNING ⚠
For your safety, read the warning labels on the unit.
NOTES:
• Installation should be done by a qualified agency in accordance with the instructions in this
manual and in compliance with all codes and requirements of authorities having jurisdiction.
• The instructions in this manual apply only to the model SCE blower-type unit heater with blower
cabinet.
• Model SCE units are not certified for residential use.

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SCE-IOM (01-22) 207697-B
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 or in buildings with negative pressure (up to 0.15 IN WC). As the
definition states, all separated-combustion, power-vented equipment must be equipped with both combustion-air
and exhaust piping to the outdoors.
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.
These codes are 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.
•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.
•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.
Warranty
Refer to the limited warranty information on the warranty card in the owner’s envelope. Warranty is void if:
a. Separated-combustion heaters are used in atmospheres containing flammable vapors or atmospheres containing
chlorinated or halogenated hydrocarbons or any contaminant (silicone, aluminum oxide, etc.) that adheres to
the spark ignition flame sensing probe.
b. Wiring is not in accordance with the diagram furnished with the heater.
c. Unit is installed without proper clearance to combustible materials.
Dimensions
All dimensions for the model SCE unit heater are shown in Figure 1 and are listed in Table 2.

6SCE-IOM (01-22) 207697-B
GENERAL INFORMATION—CONTINUED
Figure 1. Model SCE Dimensions in Inches (±1/8 (mm ±3))
STANDARD MODEL SCE
MODEL SCE WITH OPTIONAL HORIZONTAL INLET WITH DUCT FLANGES
Table 2. Dimensions
Dimension
(See Figure 1)
Unit Size
125 150, 175 200, 225 250 300 350 400
Inches ±1/8 (mm ±3)
A 32-1/4 (819) 35-1/4 (895)
B 25-1/4 (641) 30-3/4 (781) 36-1/4 (921) 43-1/2 (1105) 44-1/2 (1130) 50 (1270) 55-1/2 (1410)
D 15-1/4 (387) 20-3/4 (527) 26-1/4 (667) 33-1/2 (851) 34-1/2 (876) 40 (1016) 45-1/2 (1156)
E 8-1/8 (206) 10-3/4 (273) 9-3/4 (248) 10-3/4 (273)
F 16-1/4 (413) 21-3/4 (552) 27-1/4 (692) 34-1/2 (876) 35-1/2 (902) 41 (1041) 46-1/2 (1181)
G 7 (178) 10 (254) 9 (229) 10 (254)
H 17-3/4 (451) 23-1/4 (591) 28-3/4 (730) 36 (914) 37 (940) 42-1/2 (1080) 48 (1219)
J 17-3/8 (441) 22-7/8 (581) 28-3/8 (721) 35-5/8 (905) 38-5/8 (930) 42-1/8 (1070) 47-5/8 (1210)
K 17 (432) 18-3/8 (467) 17 (432) 16 (406) 17 (432) 18-3/8 (467) 17 (432)
L 1/2 (13) 3/4 (19)
M 40-1/4 (1022) 39 (991) 40-1/4 (1022) 39-1/4 (997) 40-1/4 (1022) 39 (991) 40-1/4 (1022)
N 27-3/4 (705) 30-3/4 (781)

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SCE-IOM (01-22) 207697-B
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 the clearances listed in Table 4 are provide as shown in the
following table. Minimum clearances are also listed on the heater rating plate.
Table 3. Weights
Unit Size
125 150, 175 200, 225 250, 300 350 400
Net Weight (Pounds (kg))
313 (142) 358 (162) 382 (173) 482 (219) 498 (226) 560 (254)
Weights
Before installation, check the supporting structure to ensure that it has sufficient load-carrying capacity to support
the weight of the unit. Refer to Table 3, which lists unit weight based on unit size.
Location
⚠ CAUTION ⚠
Do not locate the heater where it may be exposed to water spray, rain, or dripping water.
•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).
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.
Table 4. Clearances
Unit Surface Minimum Clearances (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)

8SCE-IOM (01-22) 207697-B
GENERAL INFORMATION—CONTINUED
Hazards of Chlorine—Continued
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 vent terminal
and combustion air inlet with regard to exhausters or prevailing wind directions.
INSTALLATION
NOTE: Before installation,make preparations for necessary supplies,tools,and manpower.
Uncrating/Unpacking
•The furnace is shipped completely-assembled. Immediately upon uncrating, check the gas specifications and
electrical characteristics on the unit’s rating plate to be sure that they agree with the gas and electric supply at
the installation site.
•Check the unit for any damage that may have been incurred during shipment. If damage is found, document the
damage with the transporting agency and immediately contact your Distributor. If you are an authorized Distributor,
follow the FOB freight policy procedures.
NOTE: After removing the shipping clips that fasten the unit to the crate, it is required that the
bolts that attach the shipping clips be reinstalled for support.
•The bottom corners are fastened to the crate using angled shipping clips. Remove the bolts from the shipping
clips and remove the clips. Reinstall the bolts on the heater legs to support the corner leg and the heater bottom.
•To protect the unit during shipping, blower models have special supports that must be removed before installation.
Remove the special supports as follows:
• Blower support legs: Remove the blower support legs and screws.
• Motor shipping block: Remove the wooden block located under the motor bracket. Find the two rubber pads
shipped in the instruction envelope. Place these pads on the ends of the motor bracket bolts.
• Motor shipping plate: Units equipped with motors of 1-1/2 HP or less have a metal shipping plate attached between
the motor and the blower housing. The shipping plate must be removed and the plate and screws discarded. on
a unit factory-equipped with an optional belt guard, the belt guard must be removed to reach the shipping plate.
• Concentric adapter box: The concentric adapter box assembly in the venting/combustion air kit (option CC2
or CC6) is required on all separated-combustion models. Ensure that the concentric adapter box carton is at the
installation site (refer to parts list in Table 8 or Table 10).
Shipped-Separate Parts
Some gas control options have parts that are either shipped loose—with the heater—or shipped separate. Before
beginning installation, ensure that any shipped-separate parts ordered are available at the site. Shipped-separate
options could include a shutoff valve, a condensate drain kit, a thermostat, a remote console, a disconnect switch, or
high-temperature vent sealing tape. Also, if your unit is equipped with any of the gas control options listed in Table
5, ensure that these parts are available at the job site.

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SCE-IOM (01-22) 207697-B
Suspension
⚠ WARNING ⚠
Units must be level for proper operation. Do not place additional weight on or add additional weight
to the suspended unit.
The unit has four-point suspension (see hanger center line dimensions shown in Figure 1). At each suspension point,
the unit is factory-equipped with a free-turning, female, 1-inch NPT pipe hanger. Suspend the unit by connecting the
pipe hanger to a 1-inch threaded pipe. See Figure 2 for the standard and alternative suspension methods. The factory-
installed pipe hanger may be removed and the heater may be suspended as shown in the right view of Figure 2.
Figure 2. Suspension Methods
Mounting
NOTE: Support is required where furnace and blower cabinets meet.
•Model SCE requires six mounting support locations—three on each side—as shown in Figure 3.
Table 5. Shipped-Separate Parts for Gas Control Options
Application Option Part(s)
Heating AG7 Thermostat (PN 48033)
Makeup air
AG3 Control switch (PN 29054)
AG8 Control switch (PN 29054); sensor and mixing tube (PN 48041)
AG9 Control switch (PN 29054); remote temperature selector (PN 48042); sensor and mixing tube (PN 48041)
AG15,
AG16
Control switch (PN 29054); remote temperature selector (PN 115848); stage adder module (PN 115849); discharge
air sensor holder (PN 115850); discharge air sensor holder bracket (PN 213612); AG16 also includes temperature
display (PN 115852)
AG39 Remote temperature selector (PN 174849); temperature sensor (PN 133228); mixing tube (PN 90323)
NOTE: If an optional remote console is ordered, the control switch and temperature selector may be mounted on the console.
Figure 3. Support Locations

10 SCE-IOM (01-22) 207697-B
Figure 4. Corner Mounting Supports
Duct Connections
Refer to Table 6 for duct connection dimensions.
FIELD-FABRICATED
AVAILABLE AS A PA RT
INSTALLATION—CONTINUED
Mounting—Continued
•Supports (PN 74487) available from the manufacturer or field-fabricated legs, as shown in Figure 4, may be
used at the four corner support locations. Do not use this type of support at the center support locations between
the furnace and the blower section. At the center locations, a field-fabricated angle-iron brace support must
extend horizontally, jointly supporting a portion of both the furnace and the blower cabinet. All supports must be
noncombustible.
Table 6. Duct Connection Dimensions
Unit Size
125 150, 175 200, 225 250, 300 350 400
Dimension G (Inches (mm)*
15-1/4 (387) 20-3/4 (527) 26-1/4 (667) 34-1/2 (876) 40 (1016) 45-1/2 (1156)
*See Figure 5.
Figure 5. Duct Connection Dimensions