Reznor SCE Installation Manual
Model SCE
Separated-Combustion
Packaged Furnace/Blower
NOTE: Model SCE units are not for residential use.
INSTALLATION/OPERATION/MAINTENANCE
Form I-SCE (12-14)
Obsoletes Form I-SCE (Version B.1)
TABLE OF CONTENTS Pa ges
Installation/Operation . ............. 1-30
Check Installation & Startup 30-31
Optional Equipment ................ 32-33
Service/Maintenance ............... 33-36
INDEX by Page No.
Belts ...... ................................................... 24
Blower ...................................................... 24
Blower Rotation ....................................... 24
Adjusting Blower Speed.......................... 24
Burner Air Shutters .................................. 30
Burner Carryover Systems ........................ 29
Burner
Burner Rack Removal .............................. 34
Burners..................................................... 29
Check Installation & Startup ................... 30
Cleaning the Heat Exchanger................... 35
Cleaning Pilot and Burners ..................... 34
Clearances .................................................. 4
Combustion Air .......................................... 7
Concentric Adapter Box............................ 10
Optional Condensation Drain.................... 6
Optional Dampers & Controls .................. 32
Dimensions ................................................ 3
Dirty Filter Switch (Option) .................... 33
Drives ........................................................ 24
Duct Connections...................................... 6
Ductstat (Optional)................................... 25
Electrical Supply & Connections ............ 20
Optional Electronic Modulation.............. 26
Fan Control ............................................. 23
Filter Rack & Filters ................................ 32
Gas Piping and Pressures......................... 18
Gas Valve ............................................ 24, 33
General ....................................................... 1
HAZARD
Horizontal Vent Terminal/
Combustion Air Inlet .......................... 12
Ignition System....................................... 29
Installation Codes ...................................... 2
Limit Control .......................................... 23
Limit Control Check ............................... 35
MAINTENANCE .................................... 33
Manifold Pressure Setting........................ 19
Motor ........................................................ 23
Mounting................................................... 5
Optional Accessories ................................. 32
Pilot and Ignition Systems...................... 29
SERVICE................................................. 33
Startup ..................................................... 30
Support ....................................................... 9
Suspension ................................................. 5
Thermostat ............................................... 20
Troubleshooting...................................... 35
Optional Two-Stage Operation ................ 24
Uncrating................................................... 3
Valve ........................................................ 24
Vent/Combustion Air System............... 7, 33
Venting.................................................. 7-17
Vertical
Combustion Air Inlet .......................... 15
Warranty..................................................... 2
Wiring Diagram .................................. 21-22
REFERENCE
Replacement Parts....................... Form P-SC
Gas Conversion.......................... Form P-GC
s .............................. ........... 29
INTENSITY LEVELS ............. 2
Vent Terminal/
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. Don't touch electrical switches.
3. Extinguish any open
.
4. Immediately call your gas supplier.
FOR YOUR SAFETY
The use and storage of gasoline or other
ammable vapors and liquids in
open containers in the vicinity of this appliance is hazardous.
WARNING: Improper installation, adjustment, alteration, service, or
maintenance can cause property damage, injury or death. Read the
installation, operation, and maintenance instructions thoroughly before
installing or servicing this equipment.
WARNING: red appliances are not designed for use in hazardous
atmospheres containing
ble vapors or combustible dust, in
atmospheres containing chlorinated or halogenated hydrocarbons, or in
applications with airborne silicone substances. See Hazard Levels, page
2.
Model Description
Separated-Combustion, Blower-Ty pe
GENERAL
The instructions in this manual apply to
Model SCE blower-type unit heater with
blower cabinet.
Installation should be done by a
agency in accordance with the instructions
in this manual and in compliance with all
codes and requirements of authorities having jurisdiction.
Model SCE is
Model SCE 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.
This separated combustion unit is designed and manufactured in accordance with the ANSI
of separated combustion. That 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) gas connections between the appliance and vent cap, of a type(s)
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 gases are discharged to the outside atmosphere."
Separated combustion units are designed to separate air for combustion and
from the environment of the building in which the unit is installed. Separated combustion
by the Canadian Standards Association to ANSI Standards.
SCE
Unit Heater with Blower Cabinet
Front View
Rear View
products
Form RZ-NA I-SCE, Mfg #207697 Rev 7, Page 1
General (cont'd)
appliances are recommended for use in dust laden and some corrosive fume environments or
in buildings with negative pressure (up to .15" w.c.). As the definition states, all separated
combustion, power-vented equipment must be equipped with both combustion air and exhaust piping to the outdoors.
Definitions of
Hazard Levels
in this Manual
1. Installation Codes
Special Installations
(Aircraft Hangars/
Garages)
HAZARD INTENSITY LEVELS
1. DANGER: Failure to comply will result in severe personal injury or
death and/or property damage.
2. WARNING: Failure to comply could result in severe personal injury or
death and/or property damage.
3. CAUTION: Failure to comply could result in minor personal injury
and/or property damage.
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 54/ANSI Z223.1 (latest edition).
The 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.
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.
All Installations
2. Warranty
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 Z223.1a (latest edition) pertaining to gasburning devices, and such material must not attain a temperature over 160°F by continued
operation of the heater.
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.
Form RZ-NA I-SCE, Page 2
3. Dimensions
FIGURE 1 - Model SCE Dimensions - inches ±1/8 (mm ±3)
Standard
Model
SCE
Model SCE
with Optional
Horizontal
Inlet with
Duct Flanges
Size
Dimensions (inches±1/8)
125
150, 175
200, 225
250
300
350
400
Dimensions (mm±3)
125
150, 175
200, 225
250
300
350
400
A B D E F G H J K L
32-1/4 25-1/4 15-1/4 8-1/8 16-1/4717-3/4 17-3/8 17 1/2 40-1/4 27-3/4
32-1/4 30-3/4 20-3/4 8-1/8 21-3/4723-1/4 22-7/8 18-3/8 1/2 39 27-3/4
35-1/4 36-1/4 26-1/4 10-3/4 27-1/4 10 28-3/4 28-3/8 17 1/2 40-1/4 30-3/4
35-1/4 43-1/2 33-1/2 9-3/4 34-1/2 9 36 35-5/8 16 1/2 39-1/4 30-3/4
35-1/4 44-1/2 4-1/5 10-3/4 35-1/2 10 37 38-5/8 17 3/4 40-1/4 30-3/4
35-1/4 50 40 10-3/4 41 10 42-1/
35-1/4 55-1/2 45-1/2 10-3/4 46-1/2 10 48 47-5/8 17 3/4 40-1/4 30-3/4
819 641 387 206 413 178 451 441 432 13 1022 705
819 781 527 206 552 178 591 581 467 13 991 705
895 921 667 273 692 254 730 721 432 13 1022 781
895 1105 851 248 876 229 914 905 406 13 997 781
895 1130 876 273 902 254 940 930 432 19 1022 781
895 1270 1016 273 1041 254 1080 1070 467 19 991 781
895 1410 1156 273 1181 254 1219 1210 432 19 1022 781
4. Uncrating
NM
2 42-1/8 18-3/8 3/4 39 30-3/4
The furnace is shipped completely assembled. Immediately upon uncrating, check the gas specications and electrical characteristics of the unit 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 Reznor distributor. If you are an authorized Distributor, follow the FOB freight policy procedures.
The bottom corners are fastened to the crate with angle clips. Remove the lag screws from the
shipping clips. Remove the clips and return the bolts to the heater legs to support the corner leg
and the heater bottom. Putting the bolts back in the heater is required.
Form RZ-NA I-SCE, Mfg #207697 Rev 7, Page 3
4. Uncrating (cont'd)
To protect the unit during shipping, blower models have special supports that must be
removed before installation. Follow these instructions to remove:
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 that are 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
units factory equipped with an optional belt guard, the belt guard must be removed to
reach the shipping plate.
Vent Terminal/Combustion Air Inlet
Kit with Concentric Adapter Box -
Required for All Installations
Options
Some gas control options have parts either shipped loose
with the heater or shipped separately. If your unit is
equipped with any of the gas control options in the table,
be sure these parts are available at the job site.
Before beginning installation, be sure that all other
shipped-separate options ordered are available at the
site, also. 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.
5. Clearances
and Location
For safety and convenience, provide clearances as shown in the following table. 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 above the surrounding ambient temperature is not exceeded. Minimum clearances are also listed on the heater rating plate.
The concentric adapter assembly in the venting/combustion air kit (Option
CC2 or CC6) is required on all separated combustion models. Be sure that the
concentric adapter carton is at the installation site. (See parts lists in Paragraph 9.)
Application Option Shipped Separate Components
Heati ng -- Gas
Control Option
Makeup Air -- Gas
Control Options AG9
AG7
AG3
AG15
AG16
AG39
Thermostat, P/N 48033
Control Switch, P/N 29054
Remot e T emp erat ure Selector, P/N 48042
Control Switch, P/N 29054
Remot e T emp erat ure Selector, P/N 115848
Stage Adder Module, P/N 115849
Control Switch, P/N 29054
Remot e T emp erat ure Selector, P/N 115848
Stage Adder Module, P/N 115849
Remote Disp lay Module, P/N 115852
Control Switch, P/N 29054
Remot e T emp erat ure Selector, P/N 174849
Minimum
Clearances
- inches (mm)
Location
Form RZ-NA I-SCE, Page 4
Top
6"
(152mm)
For best results, the heater should be placed with certain rules in mind. In general, a unit should
be located from 8 to 12 ft (2.6 to 3.6M) 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 to 20 feet (4.5 to 6 M).
Control Side Side Oppos ite Controls To Combustibl es To Non-Combustibles
6" (152mm) plus
width of unit
6" (152mm) 6" (152mm) 0" (0mm)
BottomSides
CAUTION: Do not locate the heater where it may be exposed to water
spray, rain, or dripping water.
6. Suspension and
Mounting
Weights
Before installing, check the supporting structure to be sure that it has sucient load-carrying capacity to support the weight.
Net Weight (lbs and kg)
Size 125 150-175 200-225 250-300 350 400
lbs 313 358 382 482 498 560
kg 142 162 173 219 226 254
Suspension
WARNING: Units must be
supported level for proper
operation. Do not place or add
additional weight to the
suspended unit. See Hazard
Levels, page 2.
FIGURE 2 - Suspension
Methods
Mounting Supports
FIGURE 3 - Model SCE
Support Locations
FIGURE 4 - Corner Mounting Supports (NOTE: Support is also required where
furnace and blower cabinets
meet. See FIGURE 3.)
Model SCE has four-point suspension. See hanger centerline dimensions in FIGURE 1 ,
Paragraph 3.
At each suspension point, the unit is factory-equipped with a free-turning, female, 1" NPT
pipe hanger. Suspend by connecting the pipe hanger to a 1" threaded pipe. See suspension
method on the left in FIGURE 2 . As an alternative method, the factory-installed pipe hanger
may be removed and the heater suspended as illustrated on the right in FIGURE 2.
Model SCE requires six support locations. See FIGURE 3 .
Supports available from the manufacturer (P/N 74487) or eld-fabricated legs as illustrated 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 eld-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.
Field-supplied supports between
the blower cabinet and the furnace
must extend horizontally supporting both sections.
Support Locations
• above - available as a part
•
right - eld fabricated
Form RZ-NA I-SCE, Mfg #207697 Rev 7, Page 5
7. Optional
Condensation
Drain for Duct
Furnaces
FIGURE 5 - Option CS1,
P/N 31765, Optional
Condensate Drain
Connection
8. Duct Connections
FIGURE 6 - Duct
Connection Dimensions inches (mm)
Model SCE furnaces are for installation upstream or downstream from a cooling coil.
When installed downstream from a refrigeration system, condensation will form; and therefore, adequate provision must be made to dispose of condensate.
Periodic cleaning of the condensate collection and disposal system is required.
Install drain connection, Option CS1, on the furnace casing as illustrated in FIGURE 5.
#10-32 x 1”Lg Machine
Screw & Nut
Terminate drain outside of the building. Provide a trap to prevent air from entering the
combustion zone. Periodic cleaning of the condensate collection and disposal system is
required. NOTE: Requires a four-inch (102mm) minimum clearance under the furnace if a
90° street elbow is used.
RTV Sealant
Size G
125 15-1/4" (387mm)
150, 175 20-3/4" (527mm)
200, 225 26-1/4" (667mm)
250, 300 34-1/2" (876mm)
350 40" (1016mm)
400 45-1/2" (1156mm)
Seal holes in bottom
pan with RTV sealant
Requirements and Suggestions for Connecting and Installing Ducts
•
Type of Ductwork - The type of duct installation to be used depends in part on the type of construction of the roof (whether
wood joist, steelbar joist, steel truss, pre-cast concrete) and the ceiling (whether hung,
etc.).
• Ductwork Material - Rectangular duct should be constructed of not lighter than No. 26 U.S. gauge galvanized iron or No. 24 B
& S gauge aluminum.
• Ductwork Structure - All duct sections 24 inches (610mm) or wider, and over 48 inches (1219mm) in length, should be cross
broken on top and bottom and should have standing seams or angle-iron braces. Joints should be S and drive strip, or locked.
• Through Masonry Walls - No warm air duct should come in contact with masonry walls. Insulate around all air duct through
masonry walls with not less than 1/2" (1" is recommended) of insulation.
• Through Unheated Space - Insulate all exposed warm air ducts passing through an unheated space with at least 1/2" (1" is
recommended) of insulation.
• Duct Supports - Suspend all ducts securely from adjacent buildings members. Do not support ducts from unit duct connections.
• Duct Sizing - Proper sizing of the supply air ductwork is necessary to ensure a satisfactory heating installation. The recognized
authority for such information is the Air Conditioning Contractors Association, 2800 Shirlington Road, Suite 300, Arlington, VA
22206 (www.acca.org). A manual covering duct sizing in detail may be purchased directly from them.
CAUTION: An external duct system static pressure not within the limits shown on the rating
plate, or improper motor pulley or belt adjustment, may overload the motor. See Hazard Levels,
page 2.
• Removable Panels - The ducts should have removable access panels on both upstream and downstream sides of the furnace.
These openings must be accessible when the furnace is in service and should be a minimum of 6" x 10" (152mm x 254mm) in size
so smoke or light may be observed inside the casing to indicate the presence of leaks in the heat exchanger. The
covers for the openings must be attached in such a manner as to prevent leakage. See FIGURE 7A
• Horizontal Discharge Duct Length - A minimum horizontal duct run of 24" (610mm) is recommended before turns or branches
are made in the duct system to reduce losses at the furnace outlet.
• Supply Air Duct/Furnace Horizontal Connection - The seal between the furnace and the duct must be mechanical. Duct
connection should be made with "U" type
of the heater giving an airtight Provide "U" type channels for the side to ensure tight joints. Use sheetmetal screws
to fasten ducts and "U" channels to the furnace
Form RZ-NA I-SCE, Page 6
on the top and bottom of the connecting duct. Slide the duct over the
See FIGURE 7B
CAUTION: Joint where supply air duct attaches to the furnace must
be sealed securely to prevent air leakage into drafthood or burner
rack area. Leakage can cause poor combustion, pilot problems, shorten
heat exchanger life, and cause poor performance. See Hazard levels,
page 2.
• Return Air Duct/Furnace Connection - All return air ducts should be attached and
sealed to return air anges to provide airtight connection.
• Return Air Duct/Grill Size - Make certain that return air ducting or grills have a free
area equal to the return duct size connection.
FIGURE 7A - Connecting
Ductwork to the Furnace
(1) Flanges on the furnace (heat exchanger) turn out as shown. (2) Shape duct connection as
shown -- "U" on top and bottom; "L" on sides. (3) Slide "U" channels over furnace top and
bottom anges making connection. (4) Form "U" channels to seal sides. Drill and lock with
sheetmetal screws.
FIGURE 7B - Install "U"
Channel on Sides of Duct
Connection
9. Venting and
Combustion Air
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 Option
CC6).
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.
These instructions apply to installation and use of the concentric adapter and vent/combustion air kit (Option CC2 or CC6) designed for use with all Reznor separated-combustion
products. The systems illustrated in this manual are the only venting/combustion air systems approved for these separated combustion units. Do not use this concentric adapter box
with any other products.
Installation should be done by a qualied agency in accordance with these instructions. The
qualied service agency installing this separated-combustion system is responsible for the
installation.
Hazards of Chlorine - The presence of chlorine vapors in the combustion air of gas-red
heating equipment presents a potential corrosion hazard. Chlorine found usually in the form
of freon or degreaser vapors, when exposed to ame, will precipitate from the compound, and
go into solution with any condensation that is 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 unit vent terminal and combustion air inlet with regard
to exhausters or prevailing wind directions. Remember, chlorine is heavier than air. This fact
should be kept in mind when determining installation location of these heaters and building
exhaust systems.
WARNING: SC Series separated combustion units are not designed or
approved for use in atmospheres containing ammable vapors or
atmospheres highly laden with chlorinated vapors. See Hazard Levels,
page 2.
Form RZ-NA I-SCE, Mfg #207697 Rev 7, Page 7
9. Venting and
Combustion Air
(cont'd)
1) Type of Pipe
Vent Pipe
Specific Venting Requirements
All pipe is field supplied. Requirements are listed for both the vent pipe and the combustion
air inlet pipe.
• Vent pipe approved for a Category III appliance OR single-wall, 26-gauge or heavier
galvanized (or a material of equivalent durability and corrosion resistance) vent pipe is
required between the heater and the concentric adapter box.
• Double-wall (Type B) vent pipe is required for vent terminal section. The length of
vent pipe that extends through the box and runs concentric through the combustion air
pipe must be one-piece with no joints.
Combustion Air Pipe
2) Venter Outlet and
Combustion Air Inlet
• NOTE: If using 7" pipe on
Sizes 200-400 (see table
below), use a taper-type 6"
to 7" enlarger to attach the
vent pipe and a 7" to 6"
reducer to attach the
combustion air pipe.
3) Pipe Length
and Diameter
Pipe Diameter and
Maximum Pipe Length
Between the Heater and
the Concentric Adapter
Box
• Minimum length between the
heater and the concentric
adapter box is 5 feet (1.5M).
Diameters of Outdoor
Concentric Pipes
Model SCE - All Sizes
Inl et Ai r P i pe
Diameter
Vent Pipe Di ameter
8"
203mm
5"
127mm
• Sealed, single-wall galvanized pipe is recommended for combustion air.
Model SCE heaters have both an inlet air and a venter outlet connection. Both are 6" diameter for all sizes.
Taper-type
Enlarger
Airflow
Taper-type
Reducer
Airflow
Pipe diameter and length requirements listed for the indoor sections of pipe (between the
heater and the concentric adapter box) are in the table below. Vent pipe diameters and
maximum indoor vent lengths apply to both horizontal and vertical vents. Add all straight
sections and equivalent lengths for elbows. The total length of the straight sections and
elbows must not exceed the Maximum Length.
Pipe Diameter and Maximum Pipe Length from Heater to Concentric Adapter
Pipe Diameter
SCE
125
150
175
200
225
250
300
350
400
The diameters of the outside (terminal) concentric pipes are shown in the concentric box
connection illustrations in FIGURE 11, page 11. The outdoor lengths depend on the instal-
lation. Outdoor vent length requirements are listed in the installation instructions for the
horizontal and vertical vent/combustion air kits on pages 12-17.
Vent Pipe Inlet Air Pipe
inches mm inches mm feet M feet M feet M
6 152 6 152 50 15 8 2.4 4 1.2
6 152 6 152 50 15 8 2.4 4 1.2
6 152 6 152 50 15 8 2.4 4 1.2
6 152 6 152 50 15 8 2.4 4 1.2
7 178 7 178 70 21 8 2.4 4 1.2
6 152 6 152 50 15 8 2.4 4 1.2
7 178 7 178 70 21 8 2.4 4 1.2
6 152 6 152 50 15 8 2.4 4 1.2
7 178 7 178 70 21 8 2.4 4 1.2
6 152 6 152 50 15 8 2.4 4 1.2
7 178 7 178 70 21 8 2.4 4 1.2
6 152 6 152 30 15 8 2.4 4 1.2
7 178 7 178 70 21 8 2.4 4 1.2
6 152 6 152 30 15 8 2.4 4 1.2
7 178 7 178 70 21 8 2.4 4 1.2
Venter Outlet Connection (diameter)
SCE 125 150 175 200 225 250 300 350 400
inches666666666
mm 152 152 152 152 152 152 152 152 152
Combus tion Air Inlet Connection (diameter)
SCE 125 150 175 200 225 250 300 350 400
inches666666666
mm 152 152 152 152 152 152 152 152 152
Maxi mum
Length 90° Elbow
Equivalent Straight Length for a
45° Elbow
4) Joints and Sealing
Form RZ-NA I-SCE, Page 8
Provide pipes as specified in Requirement No. 1 and seal joints as follows:
• If using Category III
joining and sealing Category III vent pipe sections.
• If using single-wall vent pipe run, secure slip-fit pipe connections using sheetmetal
screws or rivets. Seal all joints with aluminum tape or silicone sealant.
vent pipe run, follow the pipe manufacturer’s instructions for
FIGURE 8 - Follow STEPS to
join Double-Wall (Type B)
Pipe and
the Vent Terminal
Cap (horizontal or vertical)
(NOTE: Pipes and vent caps may
not look exactly as shown in the
illustrations. Instructions apply to
both horizontal and vertical vent
kits.)
• To seal joints in the single-wall combustion air pipe, secure slip t pipe connections
using sheetmetal screws or rivets. Seal all joints with aluminum tape or silicone sealant.
• To seal joint in the terminal section of double-wall vent pipe (allowed ONLY ABOVE
the concentric pipes on a VERTICAL vent, follow the pipe manufacturer’s instructions
for joining and sealing double-wall vent pipe sections.
• When joining the terminal section of
illustrated step-by-step instructions in FIGURE 8.
When joining the terminal section of double-wall vent pipe to a single-wall or Category III vent pipe run, follow the illustrated step-by-step instructions in FIGURE 9.
Figure 8 -
Place a continual 3/8” bead of silicone sealant
around the circumference of the vent cap collar. This will prevent any water inside the vent
cap from running down the double-wall pipe.
Do STEP 2
STEP 1
immediately following STEP 1.
Figure 8 - STEP 2
Insert the collar on the vent cap inside the
inner wall of the double-wall pipe. Insert
as far as possible. Add additional silicone
sealant to fully close any gaps between
the vent cap and the double wall pipe.
This is necessary to prevent water from
entering the double wall pipe.
double-wall vent pipe to the vent cap, follow the
FIGURE 9 - Follow STEPS
to join the Double-Wall (Type
B) Pipe to the Taper-type
Reducer that Joins it to the
Single-Wall or Category III
Vent Run
Figure 9 -
On the taper-type reducer, place a continual 1/4” bead of silicone sealant
around the circumference.
STEP 1
Do STEP 2
immediately
following
STEP 1.
5) Support
NOTE: The double-wall vent
terminal pipe does not attach to the
concentric adapter box and must be
supported during installation.
Figure 8 - STEP 3
Secure the vent cap to the double-wall pipe by drilling and inserting a 3/4” long
sheetmetal screw into the vent cap collar. Do not overtighten screw.
Make this connection a maximum of 6" (152mm) from the concentric adapter box.
Figure 9 - STEP 2
Insert the collar of the reducer into the
inner pipe of the double-wall pipe until
the bead of sealant contacts the inner
pipe creating a sealed joint.
5" I.D.
Double-
Wall
Pipe
6" to 5" or
7" to 5"
Taper-
Type
Figure 9 - STEP 3
Spaced equally around the double-wall
pipe, drill three small holes below the
sealant ring. Insert 3/4 inch long
sheetmetal screws to secure the joint. Do
not overtighten screws.
Reducer
Support horizontal runs every six feet (1.8M). Support vertical runs of type "B" double-wall
or Category III vent pipe in accordance with the requirements of the pipe manufacturer.
Support single-wall vertical pipe in accordance with accepted industry practices. Do not rely
on the heater or the adapter box for support of either horizontal or vertical pipes. Use noncombustible supports on vent pipe.
Form RZ-NA I-SCE, Mfg #207697 Rev 7, Page 9
9. Venting and Combustion Air (cont'd)
Specific Venting Requirements (cont'd)
6) Clearance
7) Concentric
Adapter Box
Do not enclose the vent pipe or place pipe closer than 6" (152mm) to combustible material.
All separated combustion installations require a concentric adapter box as illustrated in FIGURE 10.
The concentric adapter box is included in the vent/combustion air kit. Installation instructions depend
on whether the vent system is horizontal (Option CC6) or vertical (Option CC2).
FIGURE 10 - A Concentric Adapter Box is a
Required Part of all Model SCE Installations
View of Heater Connection Side
Collar for connecting
indoor portion of the
combustion air pipe
Opening for
double-wall vent
pipe to pass
through the box.
P/N 205885, Concentric Adapter Box
2 (51mm)
6-1/32
(153mm)
2 (51mm)
Top View
Heater Side View
6 Collar for
Combustion
Air Pipe
8 dia Collar for
Combustion Air Pipe
View of Vent Terminal Connection Side
Collar for
attaching outside
concentric portion
of the combustion
air pipe
Concentric Adapter Box Airflow
Vent (exhaust gas) flows through
field-supplied double-wall pipe
that extends straight through
the concentric adapter box.
14-1/4
(362mm)
End View
showing
Airflow
5
(127mm)
5-7/32
(133mm)
5-21/32
(144mm)
5-9/32
(134mm)
13-3/8 (340mm)
diameter
4
(102mm)
Opening for
vent pipe to
pass through
the box
Gray Arrows
show Flow of
Combustion Air
Form RZ-NA I-SCE, Page 10
Pipe Connections at
the Concentric
Adapter Box
FIGURE 11 - Concentric
Adapter Box
Connections
• If using 6” diameter pipes ,
Model SCE always require a
6” to 5” (152 to 127 mm)
reducer in the vent pipe.
• If using 7” diameter pipes
(allowed on Sizes 200-400),
Model SCE always requires
a 7” to 5” (178 to 127 mm)
reducer in the vent pipe and
a 6” to 7” (152 to 178 mm)
enlarger for attaching the
combustion air pipe.
When pipe diameters dier, depending on direction of airow, join the pipes with either a tapertype reducer or enlarger. Refer to illustrations in FIGURE 11 for pipe connection requirements at
the concentric adapter box.
Do NOT make actual connections until after reading the instructions and length requirements for
installing the vent/combustion air kit. The connection requirements are the same for both verti-
cal and horizontal systems, but the length of the double-wall pipe will vary.
HORIZONTAL OR VERTICAL?
Is the Separated
Combustion Vent/
Combustion Air
System Horizontal or
Vertical?
instructions begin on page 12.
Horizontal, Option CC6,
Vertical, Option CC2,
instructions begin on page 15.
Form RZ-NA I-SCE, Mfg #207697 Rev 7, Page 11
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