Reznor SSCBL Installation and operating instructions

Revision: SSCBL-RPBL-IOM (10-22) 149159-C
INDOOR SEPARATED-COMBUSTION MODEL SSCBL
OUTDOOR POWER-VENTED MODEL RPBL
INDOOR AND OUTDOOR PACKAGED SYSTEM INSTALLATION,
OPERATION, AND MAINTENANCE
Supersedes: SSCBL-RPBL-IOM (08-22) 149159-B
⚠ 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.
SSCBL
RPBL

2SSCBL-RPBL-IOM (10-22) 149159-C
TABLE OF CONTENTS
GENERAL INFORMATION .............................................................................4
References ........................................................................................4
Important Safety Information........................................................................... 4
Warranty ..........................................................................................5
Installation Codes ...................................................................................5
Dimensions ........................................................................................6
Weights........................................................................................... 7
Clearances ........................................................................................8
Package Configurations ..............................................................................8
Location ..........................................................................................8
Hazards of Chlorine ................................................................................. 8
INSTALLATION ......................................................................................9
Uncrating/Unpacking................................................................................. 9
Shipped-Separate Parts .............................................................................. 9
Mounting Support Structure ...........................................................................9
Curb Cap Base .................................................................................10
Optional Curb (Option CJ1, CJ2, CJ4, or CJ5) Assembly (Model RPBL) .....................................10
Field-Supplied Support Assembly ................................................................... 13
Mounting .........................................................................................14
Suspension (Model SSCBL) .......................................................................14
Mounting (Model SSCBL) .........................................................................15
Mounting (Model RPBL) .......................................................................... 15
Field-Installation of Cooling Coil Cabinet and Downturn Plenum .............................................. 16
Duct Connections ..................................................................................22
Requirements and Suggestions for Connecting and Installing Ducts ........................................ 23
Bottom Duct Connections (Model RPBL) ............................................................. 24
100% Outside Air Hood (Model RPBL with Option AS2).................................................. 25
Screened Air Hood for 30% Outside Air Opening (Model RPBL with Option AR6 or AR7)........................ 25
Evaporative Cooling Module (Option AS3, AS4, AS5, or AS8) .............................................25
Discharge Air Temperature Sensor Installation.........................................................25
Venting/Combustion Air Connections (Model SSCBL) ......................................................27
Specific Venting Requirements: Piping ............................................................... 27
Specific Venting Requirements: Venter Outlet and Combustion Air Inlet Connections...........................28
Specific Venting Requirements: Joints and Sealing .....................................................28
Specific Venting Requirements: Support.............................................................. 29
Specific Venting Requirements: Clearance ............................................................ 30
Specific Venting Requirements: Concentric Adapter Box ................................................. 30
Specific Venting Requirements: Concentric Adapter Box Pipe Connections ..................................31
Vent Terminal Options............................................................................ 32
Vertical Vent Terminal (Option CC2) Installation........................................................32
Horizontal Vent Terminal (Option CC6) Installation...................................................... 37
Venting Connections (Model RPBL) ....................................................................41
Piping Connections................................................................................. 42
Gas Supply Pressure............................................................................. 42
Gas Supply Piping............................................................................... 43
Supply Piping Connections ........................................................................ 43
Electrical Connections ..............................................................................45
Control Wiring ..................................................................................46
CONTROLS ........................................................................................49
Thermostat .......................................................................................49
Remote Console ...................................................................................49
Combustion Air Proving Switch........................................................................ 49
Blower Fan Control .................................................................................49
High Temperature Limit Control .......................................................................50

3
SSCBL-RPBL-IOM (10-22) 149159-C
TABLE OF CONTENTS—CONTINUED
Reverse Flow Limit Control (Model RPBL) ...............................................................50
High Ambient Limit Control (Model RPBL) ............................................................... 50
Airflow Proving Switch (Makeup Air with Option BW1) ...................................................... 50
Variable Frequency Drive ............................................................................ 50
Combination Gas Valve ............................................................................. 50
Optional Two-Stage Control (Heating Only Application).....................................................50
Optional Two-Stage Control (Makeup Air Application) ...................................................... 51
Optional Ductstat with Capillary Tubing (Option AG3, AG4, or AG5) ........................................ 51
Optional Ductstat with Remote Temperature Selector (Option AG15 , AG17, or AG19) ......................... 52
Optional Electronic Modulation ........................................................................52
Electronic Modulation Between 50% and 100% Firing Rate (Option AG7, AG8, or AG9) ........................ 52
Computer-Controlled Electronic Modulation Between 50% and 100% Firing Rate (Option AG21).................. 53
Electronic Modulation Between 25% and 100% Firing Rate (Options AG39, AG40, AG41, and AG42).............. 53
Computer-Controlled Electronic Modulation Between 25% and 100% Firing Rate (Options AG40 and AG42) ........ 54
Pilot and Ignition Systems............................................................................56
Burners and Carryover System........................................................................ 56
Dampers and Damper Controls ....................................................................... 57
Pressure Null Switch................................................................................ 57
Dirty Filter Switch ..................................................................................57
OPERATION ....................................................................................... 57
Pre-Startup Checklist ...............................................................................58
Startup ..........................................................................................58
Post-Startup Checklist ..............................................................................59
ADJUSTMENTS..................................................................................... 59
Belts, Blowers, and Drives ...........................................................................59
Checking and Adjusting Belt Tension ................................................................59
Adjusting Blower Speed ..........................................................................60
Reversing Blower Rotation ........................................................................61
Motor Load and Amp Adjustment ...................................................................... 61
Adjust Heat Stage Controllers (Option AG41 or AG42) .....................................................62
Pressure Null Switch Adjustment ......................................................................63
Measure and Adjust Manifold (Outlet) Gas Pressure ....................................................... 63
High Elevation (>2,000 Feet/609 Meters) Installations ................................................... 64
Conversion to LP (Propane) .......................................................................65
Dirty Filter Switch Adjustment ......................................................................... 65
Burner Air Shutter Adjustment ........................................................................ 66
Damper Linkage Adjustment.......................................................................... 67
MAINTENANCE..................................................................................... 67
Maintenance Procedures ............................................................................68
Combination Gas Valve Maintenance ................................................................68
Burner Rack Maintenance......................................................................... 69
Cleaning Pilot and Burners ........................................................................70
Spark Ignition System Maintenance .................................................................71
Blower Bearing Lubrication ........................................................................ 72
Venter Motor Maintenance ........................................................................ 72
Cooling Coil Maintenance ......................................................................... 72
Heat Exchanger Cleaning ......................................................................... 72
TROUBLESHOOTING ................................................................................ 73
APPENDIX: FILTER PRESSURE DROPS ................................................................ 75
INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER)............................................. 76

4SSCBL-RPBL-IOM (10-22) 149159-C
Table 1. Related Technical Manuals Available from Factory Distributor
Type Form*PN
Replacement parts SC-SCE-SSCBL-SSCDBL 269822
RP-HRPD-RPB-RPBL 263984
Control system guide OPT-D19-D21-D22-D23 1042481
Maxitrol amplifier replacement kit installation OPT-AG7,8,9,9H 262319
Outside air hood installation RPB-RPBL-AS2 132901
30% screened air hood installation OPT-AIR-HOOD 131794
Evaporative cooling module installation OPT-AS3,4,5,8 160202
Ignition controller replacement kit installation OPT-IGN-CNTRL 134704
Gas conversion OPT-GC 143147
*Also available at www.reznorhvac.com.
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.
•These packaged systems include duct furnaces that are design-certified to ANSI and CSA standards by the
Canadian Standards Association and that are approved for installation in the United States and in Canada. The
furnaces are approved for use with either natural gas or propane. The type of gas for which the furnace is equipped,
the correct firing rate, and electrical requirements are shown on the unit’s rating plate.
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.
• Improper installation,adjustment,alteration,service,or maintenance can cause property damage,
injury, or death. Read these installation, operation, and maintenance instructions thoroughly
before installing or servicing this equipment.

5
SSCBL-RPBL-IOM (10-22) 149159-C
⚠ 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.
• Read this manual and become familiar with the installation requirements of your particular
furnace. If you do not have knowledge of local requirements, check with the local gas company
or any other local agencies who might have requirements concerning this installation.
• The instructions in this manual apply only to model SSCBL and RPBL units.
Warranty
Refer to the limited warranty information on the warranty card in the owner’s envelope. Warranty is void if:
a. Furnaces 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 or without proper ventilation and air for
combustion.
d. Furnace air throughput is not adjusted within the range specified on the rating plate.
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 NFPA/ANSI Z223.1 (latest edition), National Fuel Gas Code.
A Canadian installation must be in accordance with 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.
•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 (model SSCBL): 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.
• Separated-combustion (model SSCBL): The separated-combustion furnaces in model SSCBL are 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. As the definition states, all separated-combustion, power-vented equipment must be equipped with
both combustion-air and exhaust piping to the outdoors.
• Special installations in aircraft hangars and garages (model SSCBL): 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 the CSA B149 code.

6SSCBL-RPBL-IOM (10-22) 149159-C
GENERAL INFORMATION—CONTINUED
Dimensions
Figure 1. SSCBL Dimensions (Refer to Table 2)
Table 2. SSCBL Dimensions
Dimension
(See Figure 1)
Unit Size
400 500, 600 700 800 1050 1200
Inches (mm)
A 58-7/8 (1495) 47-7/8 (1216) 53-3/8 (1356) 58-7/8 (1495) 53-3/8 (1356) 58-7/8 (1495)
B 47-5/8 (1210) 36-5/8 (930) 42-1/8 (1070) 47-5/8 (1210) 42-1/8 (1070) 47-5/8 (1210)
C 56-1/8 (1426) 45-1/8 (1146) 50-5/8 (1286) 56-1/8 (1426) 50-5/8 (1286) 56-1/8 (1426)
D 45-1/2 (1156) 34-1/2 (876) 40 (1016) 45-1/2 (1156) 40 (1016) 45-1/2 (1156)
E 83-1/2 (2121) 109-1/2 (2781) 135-1/2 (3442)
Air Opening (See Figure 1) Inches (mm)
Horizontal air inlet opening 19-1/2 (495) × B
Optional return air opening (bottom)
Horizontal discharge air opening 18 (457) D
Gas Connection Location*
(See Figure 1)
Approximate Distance from Inside Curb Cap
on Blower End of System Unit Size
1 89–90 pouces (2261–2286 mm) 400
2 103–104 pouces (2616–2642 mm) 500, 600, 700, 800
3 110–111 pouces (2794–2819 mm) 1050, 1200
*The gas connection is at curb cap height on the control side of the system.
FRONT VIEW
3/4
(19)
3/4
(19)
3/4
(19)
3/4
(19)
4-1/4
(108)
4-1/4
(108)
8-15/32
(215)
D
B
C
18 (457)
A
4-3/32
(104)
5 (127)
19-1/2
(495)
19-1/2
(495)
LEFT SIDE VIEW
7-13/32
(188)
7-13/32
(188)
7-13/32
(188)
11-11/32 (288)
18-1/2
(470)
18-1/2
(470)
40-1/8 (1019)
VENT
INLET AIR
FURNACE
CONTROL CONN
ELECTRIC
CONN GAS CONNS
E
(1) (2) (3)
VENTVENT
INLET AIRINLET AIR
FURNACEFURNACE
AIRFLOW
BLOWER
CABINET
OPTIONAL
RETURN
AIR
OPENING
NOTES:
Inches (mm)
The vent pipe collar OD = 6 (152). The inlet air
collar ID = 6 (152).
⚠ CAUTION ⚠
To ensure complete weather resistance, an outside air hood or evaporative cooling module is
required for model RPBL units.

7
SSCBL-RPBL-IOM (10-22) 149159-C
Figure 2. RPBL Dimensions (Refer to Table 3)
Table 3. RPBL Dimensions
Dimension
(See Figure 2)
Unit Size
400 500, 600 700 800 1050 1200
Inches (mm)
A 58-7/8 (1495) 47-1/8 (1216) 53-3/8 (1356) 58-7/8 (1495) 53-3/8 (1356) 58-7/8 (1495)
B 47-5/8 (1210) 36-5/8 (930) 42-1/8 (1070) 47-5/8 (1210) 42-1/8 (1070) 47-5/8 (1210)
C 56-1/8 (1426) 45-1/8 (1146) 50-5/8 (1286) 56-1/8 (1426) 50-5/8 (1286) 56-1/8 (1426)
D 45-1/2 (1156) 34-1/2 (876) 40 (1016) 45-1/2 (1156) 40 (1016) 45-1/2 (1156)
E83-3/4 (2127) 109-3/4 (2788) 135-3/4 (3448)
107-3/4 (2737)*133-3/4 (3397)*159-3/4 (4058)*
F60-5/16 (1532)*86-5/16 (2192)*112-5/16 (2853)*
Air Opening (See Figure 2) Inches (mm)
Standard horizontal air inlet opening
19-1/2 (495) × BOptional return air opening (bottom)
Optional discharge air opening with downturn plenum
Standard horizontal discharge air opening 18 (457) × D
Gas Connection Location**
(See Figure 2)
Approximate Distance from Inside Curb Cap
on Blower End of System Unit Size
1 89–90 inches (2261–2286 mm) 400
2 103–104 inches (2616–2642 mm) 500, 600, 700, 800
3 110–111 inches (2794–2819 mm) 1050, 1200
*With downturn plenum (option AQ5 or AQ8).
**The gas connection is at curb cap height on the control side of the system.
Weights
Table 4. Weights
Unit Size
400 500, 600 700 800 1050 1200
Net Weight (Pounds (kg))
849 (385) 1104 (500) 1184 (537) 1245 (565) 1476 (670) 1565 (710)
FRONT VIEW
(STANDARD HORIZONTAL DISCHARGE)
LEFT SIDE VIEW
CONTROL CONN
ELECTRIC CONN GAS CONNS
FURNACE
AIRFLOW
BLOWER
CABINET
CURB
CAP
OPTIONAL
RETURN AIR
OPENING
OPTIONAL
SUPPLY AIR
OPENING
4-3/32
(104) 19-1/2
(495)
19-1/2
(495)
3/4
(19)
3/4
(19)
3/4
(19)
3/4
(19)
4-1/4
(108)
4-1/4
(108)
4-3/32
(104)
8-15/32
(215)
40-1/8 (1019)
F
E
D
B
C
OPTIONAL
DOWNTURN
PLENUM
(2) (3)(1)
18 (457)
A
FURNACEFURNACE
AIRFLOWAIRFLOW
NOTES:
Inches (mm)
Burner and control access shown left-hand side. Specify right-hand side for opposite access and connections.

8SSCBL-RPBL-IOM (10-22) 149159-C
Package Configurations
Table 6. Package Configurations
Unit Size No. of Furnace Sections No. of Blower Cabinets
400 1
1500, 600, 700, 800 2
1050, 1200 3
GENERAL INFORMATION—CONTINUED
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, adequate combustion air, and convenient installation and service, ensure that the clearances
listed in Table 5 are provided.
Location
⚠ CAUTION ⚠
Do not locate an indoor model SSCBL unit where it may be exposed to water spray, rain, or dripping
water.
•Select a location that complies with the requirements in this manual.
•There are a variety of factors, such as system application, building structure, dimensions, and weight, that contribute
to selecting the location.
•The location must comply with the clearances listed in Table 5.
•If the unit is equipped with an outside air hood, it is recommended that the inlet to the hood not be facing into the
prevailing wind.
Hazards of Chlorine
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.
Table 5. Clearances
Unit Surface Model SSCBL Model RPBL
Minimum Clearance (Inches (mm))
Top 6 (152) —
Control side 56 (1422)
Side opposite controls, to combustibles 6 (152) —
Side opposite controls, for motor access 30 (762)
Bottom 6 (152) 0 (0)*
*When the unit is installed on a roof curb on a combustible roof, the roof area enclosed within the curb must be either ventilated, left open, or
covered with noncombustible material that has an R-value of at least 5.0.

9
SSCBL-RPBL-IOM (10-22) 149159-C
INSTALLATION
NOTE: Before installation,make preparations for necessary supplies,tools,and manpower.
Uncrating/Unpacking
•This furnace was test-operated and inspected at the factory prior to crating and was in operating condition. If
the furnace has incurred any damage in shipment, document the damage with the transporting agency and
immediately contact an authorized Reznor®distributor. If you are an authorized Distributor, follow the FOB freight
policy procedures.
•Check the rating plate for the gas specifications and electrical characteristics of the furnace to ensure that they
are compatible with the gas and electric supplies at the installation site.
Shipped-Separate Parts
•Check to see if there are any field-installed options that need to be connected to the furnace prior to installation.
• Model SSCBL: All model SSCBL installations require a vent/combustion air kit (option CC2 or CC6), which includes
a concentric adapter box, for each duct furnace. Ensure that all of the factory-supplied and field-supplied parts
needed for the vent/combustion air kit(s) are at the job site.
•Shipped-separate options could include a roof curb, a screened outside air hood, a gas shutoff valve, a thermostat,
a different control switch, a remote console, a manual fan switch, a vertical vent terminal, a vent extension, a gas
supply regulator, and/or a disconnect switch.
•If ordered with either an evaporative cooling module or a DX or chilled water cooling coil module, the module is
shipped separately. A drain and fill or freeze kit and a water hammer arrestor are shipped-separate options for an
evaporative cooling module.
•Some gas control options will have parts either shipped loose with the heater or shipped separately. If the unit is
equipped with any of the gas control options listed in Table 7, ensure that these parts are available at the job site.
Table 7. Shipped-Separate Parts for Gas Control Options
Application Option Part(s)
Heating
AG7 Thermostat (PN 48033)
AG10 Thermostat (PN 91919)
AG11 Thermostat (PN 93435)
Makeup air
AG3, AG8 Control switch (PN 29054)
AG9 Control switch (PN 29054), remote temperature selector (PN 48042)
AG15, AG17,
AG19 Control switch (PN 29054), remote temperature selector (PN 115848), stage adder module(s) (PN 115849)
AG39, AG41 Remote temperature selector (PN 174849)
NOTE: If an optional remote console is ordered, the control switch and temperature selector may be mounted on the console.
Mounting Support Structure
⚠ WARNING ⚠
Before installation, check the supporting structure to ensure that it has sufficient load-carrying
capacity to support the weight of the unit.
⚠ CAUTION ⚠
• Before installing the curb, verify that the size is correct for the system being installed.
• Whether using an optional roof curb available with the system or a field-supplied curb, the curb
must be secure, square and level.
• IMPORTANT:The area enclosed by the roof curb must comply withTable 5.If the roof is constructed
of combustible materials, the area within curb must be either ventilated, left open, or covered
with non-combustible material that has an R-value of at least 5.0.

10 SSCBL-RPBL-IOM (10-22) 149159-C
INSTALLATION—CONTINUED
Mounting Support Structure—Continued
NOTES:
• Prior to installation, ensure that the method of support is in agreement with all local building
codes and, for outdoor installations, is suited to the climate.
• If the area within the curb is left open, higher radiated sound levels may result.
• The system can have a variety of configurations that affect installation. If the system does not
have a downturn plenum, the discharge is horizontal.
Curb Cap Base
•Units are equipped with a load bearing curb cap that forms an integral part of the unit. The curb cap is welded at
all joints.
• Model SSCBL: The curb cap has suspension holes at each corner and hanger brackets on the sides. Each
suspension location requires a 1/2-inch threaded rod (refer to Suspension (Model SSCBL) section).
• Model RPBL: The curb cap has a skirt that fits over a roof curb to provide a weatherproof installation. Four holes
are provided at the curb cap corners for lifting the unit. These holes do not interfere with unit weatherproofing. The
curb cap is not designed to be placed directly on the roof surface. The system may be mounted on an optional roof
curb purchased with the unit, a field-supplied roof curb, or field-supplied supports. If the system has a downturn
plenum and/or a bottom return air opening, a roof curb is recommended to provide a weatherproof installation
as well as more workable clearances for ductwork (refer to Bottom Duct Connections (Model RPBL) section).
Optional Curb (Option CJ1, CJ2, CJ4, or CJ5) Assembly (Model RPBL)
NOTES:
• Curbs are shipped unassembled. Field-assembly and mounting on the roof are the responsibility
of the installer. All required hardware necessary to complete the assembly is provided.
• The system can have a variety of configurations that affect installation. Option CJ1 is for a
standard RPBL unit. Option CJ2 is for a unit with a factory-installed downturn plenum (option
AQ5 or AQ8). Option CJ4 is for a unit with a field-installed cooling coil cabinet (option AU2 or
AU3). Option CJ5 is for a unit with a field-installed cooling coil cabinet with a downturn plenum
(option AU11, AU12, AU13, or AU14). Figure 3 shows a unit with an option AQ5 or AQ8 downturn
plenum. If the system does not have a downturn plenum, the discharge is horizontal.
• Field installed means that the cooling coil cabinet, with or without the downturn, is factory-
assembled and shipped separately. The roof curb is sized to accommodate the complete length
of the system. The shipped-separate cooling coil cabinet, with or without a downturn, must be
lifted to the roof separately from the packaged system, set on the roof curb, and connected to
the furnace section.

11
SSCBL-RPBL-IOM (10-22) 149159-C
CORNER DETAIL
CURB SECTION
TYPICAL CURB DETAIL
Cap
Screws
Figure 3. Optional Curb Assembly—Model RPBL (Refer to Table 8)
Table 8. Optional Curb Dimensions—Model RPBL
Dimension
(See Figure 3)Option
Unit Size
400 500, 600 700 800 1050 1200
Inches (mm)
A
CJ1 82-1/4 (2089) 108-1/4 (2750) 134-1/4 (3410)
CJ2 106-1/4 (2699) 132-1/4 (3359) 158-1/4 (4020)
CJ4 150-1/4 (3816) 165-1/4 (4197) 170-3/4 (4337) 176-1/4 (4477) 1-3/4 (4997) 202-1/4 (5137)
CJ5 174-1/4 (4426) 189-1/4 (4807) 194-3/4 (4947) 200-1/4 (5086) 220-3/4 (5607) 226-1/4 (5747)
B All 54-1/2 (1384) 43-9/16 (1106) 49-1/16 (1246) 54-1/2 (1384) 49-1/16 (1246) 54-1/2 (1384)
C*
CJ1 78-1/2 (1994) 104-1/2 (2654) 130-1/2 (3315)
CJ2 102-1/2 (2604) 128-1/2 (3264) 154-1/2 (3924)
CJ4 146-1/2 (3721) 161-1/2 (4102) 167 (4242) 172-1/2 (4382) 193 (4902) 198-1/2 (5042)
CJ5 170-1/2 (4331) 185-1/2 (4712) 191 (4851) 196-1/2 (4991) 217 (5512) 222-1/2 (5652)
D*All 50-13/16 (1291) 39-13/16 (1011) 45-5/16 (1151) 50-13/16 (1291) 45-5/16 (1151) 50-13/16 (1291)
*Roof opening dimensions.

12 SSCBL-RPBL-IOM (10-22) 149159-C
INSTALLATION—CONTINUED
Mounting Support Structure—Continued
Optional Curb (Option CJ1, CJ2, CJ4, or CJ5) Assembly (Model RPBL)—Continued
1. Position and connect cross rails and side rails as shown in Figure 3.
2. If side has two side pieces, fasten them using splice plates and hardware as shown in Figure 4.
3. Check assembly for squareness—adjust as neccesary so that diagonal measurements are equal within ±1/8-inch
(±3-mm) tolerance.
⚠ CAUTION ⚠
Curb must be leveled in both directions with no twist end-to-end to ensure good weather-tight seal
between unit’s curb cap and curb.
4. Level curb as necessary using shims.
5. Secure curb to roof deck using hardware provided.
6. Install field-supplied flashing.
Table 9. Optional Curb Weights—Model RPBL
Option
Unit Size
400 500, 600 700 800 1050 1200
Pounds (kg)
CJ1 150 (68) 167 (76) 173 (78) 179 (81) 202 (92) 208 (94)
CJ2 177 (80) 193 (88) 199 (91) 205 (93) 228 (103) 234 (106)
CJ4 227 (103) 231 (105) 243 (110) 255 (116) 271 (123) 282 (128)
CJ5 253 (115) 257 (117) 269 (122) 280 (127) 296 (134) 308 (140)
Figure 4. Splicing Detail

13
SSCBL-RPBL-IOM (10-22) 149159-C
Field-Supplied Support Assembly
⚠ WARNING ⚠
Do not close or block the openings under each end of a system mounted on 4 × 4 treated wooden
rails. If cross supports are used under the 4 × 4 rails, do not enclose the area under the furnace.
The space under the furnace MUST be left open for ventilation.
NOTES:
• The field-supplied, cross-support structure must be adequate for the weight of the system. Cross-
supports should run the entire width of the system to support the rails at the recommended
locations (see Figure 5, DETAIL A).
• Whether the supports are mounted directly on a surface or placed up on an additional structure,
the horizontal length of the system should be supported by two 4 × 4 treated wooden rails.
• Model RPBL: If considering this type of installation in snow areas, it is recommended that the
weather-resistant 4 × 4 wooden rails underneath the system be on a cross-support structure at
least 12 inches higher than the roof surface.
1. Cut treated 4 × 4 wooden rails for length in accordance with dimension A (see Figure 5, DETAIL A).
2. Space rails in accordance with dimension B (see Figure 5, DETAIL A) so that curb cap skirt fits over edge of
boards with rails sitting inside horizontal length of curb cap. If rails are being laid directly on roof, position them
as shown in Figure 5, DETAIL A).
3. If rails are not being placed directly on surface, install cross-supports underneath rails at ends of unit and at all
cabinet joints (see Figure 5, DETAIL B).
Figure 5. Field-Supplied Support Assembly (Refer to Table 10)
DETAIL A
DETAIL B

14 SSCBL-RPBL-IOM (10-22) 149159-C
INSTALLATION—CONTINUED
Mounting Support Structure—Continued
Field-Supplied Support Assembly—Continued
Table 10. Field-Supplied Support Assembly Dimensions
Dimension
(See Figure 5)Configuration
SSCBL Unit Size
400 500, 600 700 800 1050 1200
Inches (mm)
A
Standard 82-1/4
(2089)
108-1/4
(2750)
108-1/4
(2750)
108-1/4
(2750)
134-1/4
(3410)
134-1/4
(3410)
With cooling coil cabinet
(option AU2 or AU3)
150-1/4
(3816)
176-1/4
(4477)
176-1/4
(4477)
176-1/4
(4477)
202-1/4
(5137)
158-1/4
(4020)
B All 54-1/2
(1384)
43-9/16
(1106)
49-1/16
(1246)
54-1/2
(1384)
49-1/16
(1246)
54-1/2
(1384)
Dimension
(See Figure 5)Configuration
RPBL Unit Size
400 500, 600 700 800 1050 1200
Inches (mm)
A
Standard 82-1/4
(2089)
108-1/4
(2750)
108-1/4
(2750)
108-1/4
(2750)
134-1/4
(3410)
134-1/4
(3410)
With cooling coil cabinet
(option AU2 or AU3)
150-1/4
(3816)
165-1/4
(4197)
170-3/4
(4337)
176-1/4
(4477)
196-3/4
(4997)
202-1/4
(5137)
With downturn plenum
(option AQ5 or AQ8)*106-1/4 (2699)
132-1/4
(3359)
132-1/4
(3359)
132-1/4
(3359)
158-1/4
(4020)
158-1/4
(4020)
With cooling coil cabinet
with downturn plenum
(option AU11, AU12, AU13, or AU14)*
174-1/4
(4426)
189-1/4
(4807)
194-3/4
(4947)
200-1/4
(5086)
220-3/4
(5607)
226-1/4
(5747)
B All 54-1/2
(1384)
43-9/16
(1106)
49-1/16
(1246)
54-1/2
(1384)
49-1/16
(1246)
54-1/2
(1384)
*Although dimensions are included for units with a downturn plenum cabinet, it is strongly recommended that a full roof curb be used on an
installation with a downturn plenum cabinet and/or a bottom return air duct.
Mounting
Model SSCBL systems are designed for either suspension or mounting on rails. Model RPBL systems are designed
for mounting only on rails or on a curb.
⚠ DANGER ⚠
Use a suitable hoist to lift the unit (refer to Weights section). Lifting holes are provided for rigging.
Use spreader bars when lifting to prevent chains or cables from damaging the unit.
⚠ CAUTION ⚠
All installed systems must be level.
NOTE: Properly suspending or mounting the unit is the responsibility of the installer.
Suspension (Model SSCBL)
⚠ WARNING ⚠
Units must be level for proper operation. Do not place additional weight on or add additional weight
to the suspended unit.
The curb cap has suspension holes at each corner and six hanger brackets on the sides (see Figure 6, DETAIL
A for suspension dimensions). Each suspension point requires a 1/2-inch threaded rod (see Figure 6, DETAIL B).

15
SSCBL-RPBL-IOM (10-22) 149159-C
Figure 6. Suspension of Model SSCBL (Refer to Table 11)
Mounting (Model SSCBL)
Lift the unit using a suitable hoist and spreader bars and set it on the rails. Leave the ends open underneath for
ventilation.
Mounting (Model RPBL)
⚠ CAUTION ⚠
IMPORTANT: To prevent damage from wind blown rain and capillary action, the top surface of the
curb MUST be sealed using 1/4-inch × 1-1/4-inch sealant tape or two 1/4-inch beads of suitable
sealant.
NOTE: If the system includes an outside air hood, a cooling coil cabinet, or an evaporative cooling
module, install it after the unit is in place. Options AU2, AU3, AU11, AU12, AU13, and AU14 are not
factory-installed and must must be lifted to the roof separately from the packaged system, set on
the roof curb, and attached to the furnace.
1. Apply furnished 1/4-inch × 1-1/4-inch foam sealant tape or two 1/4-inch beads of suitable sealant to top surface
of curb, making good butt joints at corners.
2. Lift unit using suitable hoist and spreader bars and set it on curb or rails. If set on rails, leave ends open underneath
for ventilation.
Top View of Curb Cap Assembly
Suspension Point Dimensions
G
F
H
Airflow
58-25/32 (1493) 3/4
(19)
3/4
(19)
DETAIL A DETAIL B
Table 11. SSCBL Suspension Dimensions
Dimension
(See Figure 6)
Unit Size
400 500, 600 700 800 1050 1200
Inches (mm)
F 59-9/16 (1513) 48-9/16 (1233) 54-1/16 (1373) 59-9/16 (1513) 54-1/16 (1373) 59-9/16 (1513)
G 54-3/8 (1381) 43-3/8 (1102) 48-7/8 (1229) 54-3/8 (1381) 48-7/8 (1229) 54-3/8 (1381)
H*27-3/32 (688) 53-3/32 (1352) 79-7/32 (2012)
*Does not apply to a system with a field-installed cooling coil cabinet (option AU2 or AU3).

16 SSCBL-RPBL-IOM (10-22) 149159-C
INSTALLATION—CONTINUED
Field-Installation of Cooling Coil Cabinet and Downturn Plenum
⚠ WARNING ⚠
Do NOT install the cooling coil cabinet before lifting the packaged blower/furnace system into
position. Lift the cooling coil cabinet separately. Do NOT install the cooling coil cabinet while the
furnace is in operation.
NOTES:
• If the cabinet is being installed on an indoor model SSCBL, consult the factory regarding
installation. If suspending the cabinet, consult the factory.
• The optional cooling coil cabinet is shipped separately for field-installation.The cabinet includes
either a chilled water or a refrigerant (DX) air conditioning coil. Cabinets alone have horizontal
discharge but may have an attached downturn plenum for vertical discharge.
• The total length of an indoor system with a cooling coil cabinet depends on how the system is
installed. If the blower/furnace is suspended, a special curb cap and a field-installed transition
duct are required. Contact your Sales Representative to receive specific information. If an indoor
system is mounted, add the cabinet length to the blower/furnace length listed inTable 2 orTable 3.
• Optional two-position discharge dampers in option AU12 or AU14 fit in the discharge air opening.
The damper motor fits inside the downturn cabinet.
• If the downturn plenum is equipped with discharge dampers, field wiring including drilling holes
and running wires is required. Cooling coil cabinet dimensions are listed in Table 12 and shown
in Figure 7.
Table 12. Cooling Coil Cabinet and Downturn Plenum Dimensions
Dimension
(See Figure 7)
Unit Size
500, 600 700, 1050 400, 800, 1200
Inches (mm)
A 47-3/4 (1213) 53-1/4 (1353) 58-3/4 (1492)
B 34-1/2 (876) 40 (1016) 45-1/2 (1156)
C 45-1/8 (1146) 50-5/8 (1286) 56-1/8 (1426)
D 56-3/8 (1432) 62 (1575) 67-3/8 (1711)
E59-3/8 (1508) 64-7/8 (1648) 70-3/8 (1788)
83-3/8 (2118)** 88-7/8 (2257)** 94-3/8 (2397)**
F57-3/8 (1457) 63 (1600) 68-3/8 (1737)
81-3/8 (2067)** 87 (2210)** 92-3/8 (2346)**
G 29-1/8 (740) 31-7/8 (810) 34-5/8 (879)
H 45-1/8 (1146) 50-5/8 (1286) 56-1/8 (1426)
**With downturn plenum (option AQ5 or AQ8).
Configuration Cabinet
Dimension
Unit Size
400 500, 600 700 800 1050 1200
Inches (mm)
With chilled water coil cabinet
Width
58-7/8
(1495)
47-1/8
(1197)
53-3/8
(1356)
58-7/8
(1495)
53-3/8
(1356)
58-7/8
(1495)
With DX coil cabinet 66-7/8
(1698)
55-1/8
(1400)
61-3/8
(1559)
66-7/8
(1698)
61-3/8
(1559)
66-7/8
(1698)
With cooling coil cabinet
Length
150-3/8
(3820)
165-3/8
(4201)
171
(4343)
176-3/8
(4480)
197
(5004)
202-3/8
(5140)
With cooling coil cabinet with
downturn plenum
173-1/2
(4407)
188-1/2
(4788)
194-1/8
(4931)
199-1/2
(5067)
220-1/8
(5591)
225-1/2
(5728)

17
SSCBL-RPBL-IOM (10-22) 149159-C
Figure 7. Cooling Coil Cabinet and Downturn Plenum Dimensions (Refer to Table 12)
DX COIL CABINET (OPTION AU3 FOR RPBL AND SSCBL AND OPTIONS AU13 AND AU14 FOR RPBL)
DOWNTURN PLENUM CABINET
(FACTORY-INSTALLED)
CHILLED WATER COIL CABINET
(OPTION AU2 FOR RPBL AND SSCBL AND OPTIONS AU11 AND AU12 FOR RPBL)

18 SSCBL-RPBL-IOM (10-22) 149159-C
INSTALLATION—CONTINUED
Field-Installation of Cooling Coil Cabinet and Downturn Plenum—Continued
Using the parts shipped inside the cooling coil cabinet (refer to Table 13), follow the instructions to connect the coil
cabinet to the furnace. In addition to normally-required tools, a driver extension, a hammer, and a bar or short length
of 2 × 4 will be required. Silicone caulking must be field-supplied.
1. After blower/furnace packaged system is in place on roof curb or mounting rails, remove lifting lugs on discharge
end of system using 9/16 wrench or socket.
2. Lift cooling coil cabinet and position it with inlet side next to discharge opening of furnace. Remove lifting lugs
on cooling coil cabinet.
3. Slide cooling coil cabinet so that furnace duct flanges and cooling coil cabinet butt together (see Figure 8).
Figure 8. Cooling Coil Cabinet Mounting Position
4. Join duct flanges:
a. Connect one side duct connector to both top and bottom duct connectors using #14 × 3/4 sheet metal screws
(see Figure 9, DETAIL A).
b. Install partially-assembled connectors with screw holes in top piece at open side (see Figure 9, DETAIL B)
into space between furnace and cooling coil cabinet. Tap with hammer—first on side, then on top, and lastly
on bottom—until duct connector assembly is seated over both duct flanges.
Table 13. Cooling Coil Cabinet Factory-Supplied Components
Component Description
Unit Size
500, 600 700, 1050 400, 800, 1200
PN (Quantity)
Duct connector
Top/bottom, 36-inch 106338 (2) —
Top/bottom, 41-1/2-inch — 106339 (2) —
Top/bottom, 47-inch — 106340 (2)
Side, 19-1/2-inch 106395 (2)
Filler panel
Left side 172357 (1)
Right side 172358 (1)
Top 172362 (1) 172363 (1) 172364 (1)
Rubber gasket strip
3/32 × 1-1/8 × 53-7/8 103608 (1) —
3/32 × 1-1/8 × 59-3/8 — 103609 (1) —
3/32 × 1-1/8 × 64-7/8 — 106310 (1)
Insulation 1 × 42 × 9 172546 (2)
Sheet metal screw #10 × 1/2 11813 (24) 11813 (25) 11813 (26)
#14 × 3/4 105171 (8)
Furnace
Discharge
with Duct
Flange
Duct Flanges
Cooling Coil
Cabinet

19
SSCBL-RPBL-IOM (10-22) 149159-C
c. Install other side duct connector and use driver extension to install #14 × 3/4 sheet metal screws that secure
side connector to top and bottom connectors (see Figure 9, DETAIL C). Ensure that top screws are vertical
and bottom screws are horizontal and that U-shaped rectangular frame joins duct flanges on all four sides.
Figure 9. Duct Connector Assembly
5. If cabinet does not include downturn plenum with discharge damper, proceed to step 6. If installing an option AU12
or AU14 cooling coil cabinet with downturn plenum cabinet equipped with optional discharge dampers, connect
damper motor wires to terminal blocks in furnace electrical compartment as follows:
a. Drill three 7/8-inch holes ensuring that all holes are free of burrs:
(1) Remove control side door on discharge plenum. Locate discharge damper motor with three wires long
enough to reach furnace section.
(2) On leg of downturn plenum next to cooling coil cabinet locate mounting screw shown in Figure 10, DETAIL
A and measure up 6 inches (152 mm). Drill first 7/8-inch hole at same center line as mounting screw.
Figure 10. Wiring Hole Locations
(3) Remove cooling coil access panel(s).
DETAIL A DETAIL B DETAIL C
MOUNTING SCREW
6 INCHES (152 mm)
FIRST HOLE
CENTER HOLE PLUG
DETAIL A DETAIL B

20 SSCBL-RPBL-IOM (10-22) 149159-C
INSTALLATION—CONTINUED
Field-Installation of Cooling Coil Cabinet and Downturn Plenum—Continued
(4) Locate coil blockoff plate and measure up 4 inches (102 mm) from bottom of blockoff plate. Drill second
7/8-inch hole at that location at center point of blockoff plate. Hole should be approximately even with first
hole drilled in downturn plenum leg.
(5) On cabinet leg on entering air side of cooling coil cabinet, measure up 10 inches (254 mm) from bottom
pan and then in 4inches (102 mm) from edge. Drill third 7/8-inch hole at that location.
b. On outside of furnace section where flanges were joined in step 4, locate three hole plugs and remove center
plug to expose 7/8-inch hole in cabinet leg (see Figure 10, DETAIL B).
c. Run damper motor wires:
(1) Out through hole in discharge plenum leg into cooling coil cabinet.
(2) Through blockoff plate across coil cabinet.
(3) Out through hole in cooling coil cabinet leg.
(4) Into furnace section.
d. On bottom of electrical box in furnace section, remove hole plug below terminal blocks and route damper motor
wires up through hole and into electrical box.
e. Connect wires in accordance with Figure 11.
Figure 11. Discharge Damper Wiring Connections