Reznor SFT-100 Installation Manual
NOTICE:
The information contained on the following page(s) was produced
prior to May 1, 2014. On that date Reznor became part of
Nortek, Inc.
References to any other company afliations are no longer valid.
©2014 Reznor, LLC. All Rights Reserved.
Trademark notice: Reznor is registered in at least the United States.
0514 PDF Form Cover1
Sizes 45, 60 and 75
are certified to
CSA Requirement
10-96 for
RESIDENTIAL
INSTALLATION
®
APPLIES TO: Installation/Operation/Service
Separated-Combustion,
Power-V ented
INST ALLA TION FORM RZ-I-SFT
Obsoletes Form RZ 432 (V ersion C)
Model SFT
Gas-Fired,
Unit Heaters
Models SFT 45, 60 and 75 are certified for both residential and commercial/industrial installations.
Models SFT 100-300 are certified for commercial/industrial installations only.
Table of Contents
Installation and Operation......................................................... Paragraphs 1-17....................Pages 1-15
Check Installation and Start-Up ....................................................Paragraph 18 ..................Pages 16-17
Maintenance/Troubleshooting/Service ................................... Paragraphs 19-31 ..................Pages 18-24
Index By Page No.
Burner Orifices ........................................ 19
Burner Removal....................................... 18
Burners .................................................... 14
Check Installation and Start-Up .............. 16
Clearances.................................................. 3
Combustion Air ......................................... 6
Combustion Air Proving Switch........ 14, 21
Concentric Adapter Box ............................ 6
Dimensions ................................................ 5
Downturn Nozzles (Option Kit) ................ 2
Electrical Supply and Connections.......... 13
Fan ........................................................... 20
Fan Motor ................................................ 13
Flame Rollout Switch .............................. 21
Gas Piping and Pressures ........................ 12
Gas V alve........................................... 14, 21
REFERENCES: Replacement Parts, Form RZ-NA-P-FT/SFT
Index By Page No.
General .................................................... 1
Hazard Intensity Levels ........................... 2
Heat Exchanger ..................................... 19
High Altitude Combustion Air
Pressure Switch ...................... 3, 13
High Altitude Operation ........................ 3
Ignition Control Module ....................... 14
Ignition Control Module LED
Codes ..................................... 14, 21
Ignition System................................ 14, 19
Installation Codes .................................... 2
Limit Control ......................................... 21
Location (Heater)..................................... 3
Louvers, Vertical (Option Kit)................. 2
Maintenance .......................................... 18
Manifold Pressure.................................. 13
Gas Conversion, Form RZ-NA-I-FT/SFT -GC
FOR YOUR SAFETY
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.
• Immediately call your gas supplier from
a neighbor's phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier,
call your fire department.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
Index By Page No.
Rating Plate .......................................... 23
Serial No. .............................................. 23
Service .................................................. 18
Start-Up ................................................ 16
Suspending ............................................. 3
Thermostat ............................................ 13
Troubleshooting.................................... 21
Uncrating and Preparation...................... 2
V ent/Combustion Air System ........... 6, 21
Horizontal Vent Terminal/
Combustion Air Inlet (Opt CC6) ...... 7-9
Vertical Vent T erminal/Combustion
Air Inlet (Opt CC2) .................... 10-11
Venter Motor ........................................ 20
Warranty ................................................. 2
Wiring Diagram .................................... 15
WARNING: Gas-fired appliances are not
designed for use in hazardous atmospheres
containing flammable vapors or combustible
dust. See Hazard Levels, page 2.
GENERAL
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 to the separated-combustion unit heater model shown
below.
Model Description
SFT Separated-Combustion,
Fan-Type, Suspended
Unit Heater
WARNING: Improper installation, adjustment,
alteration, service, or maintenance can cause
property damage, injury, or death. Refer to this
manual. For assistance or additional information,
consult a qualified installer, service agency, or
the gas supplier.
All sizes of Model SFT heaters are design-certified by the Canadian
Standards Association (CSA) to ANSI Z83.8a and CGA 2.6a for industrial/commercial installations in the United States and Canada. Models SFT 45, 60 and 75 are approved by the Canadian Standards Association to CSA 10-96 for residential installations in both the United
States and Canada. All heaters are available for use with either natural
or propane gas. The type of gas, the firing rate, and the electrical characteristics are on the unit rating plate.
Form RZ -NA-I-SFT, Mfg No. 173474 (Rev 6), Page 1
GENERAL (Cont'd)
These separated combustion units are designed and manufactured in
accordance with the ANSI definition of separated combustion. That
definition 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 the air for combustion and the 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 .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.
WARNING: Model SFT separated combustion
units are not designed or approved for use in
atmospheres containing flammable vapors or
combustible dust. See Hazard Levels, below.
W ARNING: Should overheating occur or the gas
supply fail to shut off, shut off the manual gas
valve to the appliance before shutting off the
electrical supply .
garages in accordance with ANSI/NFPA No. 88A (latest edition), S tandard for Parking Structures; and for repair garages in accordance with
ANSI/NFPA No. 88B (latest edition), Standard for Repair Garages.
ANSI/NFPA-88 (latest edition) specifies overhead heaters must be installed at least eight feet above the floor. In Canada, installations in
aircraft hangars should be in accordance with the requirements of the
enforcing authorities, and in public garages in accordance with CAN/
CGA B149 codes.
ANSI/NFPA 409 (latest edition) specifies a clearance of ten feet to the
bottom of the heater from the highest surface of the top of the wing or
engine enclosure of whatever aircraft would be the highest to be housed
in the hangar, and a minimum clearance of eight feet from the floor in
other sections of aircraft hangars, such as the offices, and shops which
communicate with areas used for servicing or storage. The heaters must
be located so as to be protected from damage by aircraft or other objects such as cranes and movable scaffolding. In addition, the heaters
must be located so as to be accessible for servicing, adjustment, etc.
2. W arranty
Refer to the limited warranty information on the warranty form in the
"Owner's Envelope".
Warranty is void if ...
a. Wiring is not in accordance with the diagram furnished with the
heater.
b. The unit is installed without proper clearance to combustible
materials.
c. The heater is connected to a duct system or if the air delivery
system is modified.
W ARNING: Do not use this appliance if any part
has been under water. Immediately call a
qualified service technician to inspect the
appliance and replace any gas control which has
been under water.
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.
1. 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 ANSI Z223.1a
(latest edition). A Canadian installation must be in accordance with the
CAN/CGA B149.1 and B149.2 Installation Code for Gas Burning Appliances and Equipment. 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.
Special Commercial Installations (Aircraft
Hangars/Repair Garages/Parking Garages)
Installations in aircraft hangars should be in accordance with ANSI/
NFP A No. 409 (latest edition), S tandard for Aircraft Hangars; in public
Form RZ -NA-I-SFT, Page 2
3. Uncrating and Preparation
This unit was test operated and inspected at the factory prior to crating
and was in operating condition. If the heater has incurred any damage
in shipment, document the damage with the transporting agency and
immediately contact your Reznor Distributor .
Check the rating plate for the gas specifications and electrical characteristics of the heater to be sure that they are compatible with the gas
and electric supplies at the installation site.
Read this booklet and become familiar with the installation requirements of your particular heater . 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.
Before beginning, make preparations for necessary supplies, tools, and
manpower. If the installation includes optional vertical louvers or a
downturn nozzle, install these options before the heater is suspended.
Follow the instructions included in the option package; option packages are shipped separately .
If the heater is to be operated at an altitude above 2000 ft (610M), a
pressure adjustment may be required. See Paragraph 4.
Concentric Adapter Kits for combustion air and
venting (Option CC2 or Option CC6)
The concentric adapter is a required component in the installation of
all Model SFT heaters. The kit is shipped in a separate carton. Be sure
that the concentric adapter carton is at the installation site. A horizontal
vent/combustion air kit including the concentric adapter is identified
as Option CC6. A vertical vent/combustion air kit including the concentric adapter is identified as Option CC2. See the parts lists in Paragraph 9.
4. High Altitude Operation
If the heater is being installed in an altitude above 2000 ft (610M),
check the rating plate to determine what must be done to prepare the
heater for high altitude operation.
Check the rating plate, determine which circumstance below applies,
and follow the instructions.
• If the altitude range on the rating plate agrees with the altitude at
the site, no further action is required. Proceed with the installation.
• If the altitude range on the rating plate reads "Sea Level" and the
altitude at the site is between 2000 ft and 6000 ft (610M to
1830M), install the heater and follow the instructions in Paragraph
10 to derate by manifold gas pressure adjustment.
• If the altitude range on the rating plate reads "Sea Level" and the
altitude at the site is above 6000 ft (1830M), in addition to adjusting the manifold pressure, it will be necessary to replace the combustion air pressure switch. Order the appropriate switch from the
list below and replace the switch before suspending the heater.
After the heater is installed, follow the instructions in Paragraph
10 to derate by adjusting the manifold gas pressure.
High Altitude (above 6000 ft) Combustion Air Pressure Switches
SFT P/N Description
45-75 173316 Orange Label, -.55", #PPS10143-2908
100-125 173315 Gray Label, -.35", #PPS10143-2907
150-300 173312 White Label, -.60", #PPS10143-2904
Figure 1 - Model SFT with Access Panel Open showing
Combustion Air Pressure Switch
(flexible combustion air hose removed
for clarity)
Combustion Air
Pressure Switch
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 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) .
CAUTION: Do not locate the heater where it may be
exposed to water spray, rain, or dripping water.
6. Clearances
This heater must be installed so that the clearances in the table below
are provided for required spacing from combustible construction and
for service and inspection. 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.
Required Clearances - inches (mm)
Model SFT 45, 100, 125, 250,
60, 75 150, 200 300
Top 1 (25) 6 (152) 6 (152)
Flue Connector 6 (152) 6 (152) 6 (152)
Access Panel 20 (508) 24 (610) 24 (610)
Non-Access Side 1 (25) 6 (152) 6 (152)
Bottom* 1 (25) 1 (25) 1 (25)
Rear 18 (457) 18 (457) 24 (610)
*A Model SFT 45, 60, or 75 installed in a residential garage must be
installed with a minimum clearance above the floor of 18 inches
(457mm). Sizes 100-300 are not certified for residential installations.
Gas
Valve
If the heater is going to be de-rated by adjusting the manifold pressure,
find the label in the owner's envelope. When the adjustment is completed, fill-in the correct pressure setting with permanent marker and
adhere the label to the heater in a conspicuous location close to the gas
valve.
5. Unit Heater Location
For best results, the heater should be placed with certain rules in mind.
In general, a unit should be located from 8 to 12 feet (2.4 to 3.6 M)
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. 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.
7. Suspending the Heater
Before suspending the heater, check the supporting structure to be used
to verify that it has sufficient load-carrying capacity to support the
weight of the unit.
Net Weight - lbs and kg
Size 45 60 75 100 125 150 200 250 300
lbs 85 110 120 148 153 216 226 272 294
kg 39 50 54 67 69 98 103 123 133
When the heater is lifted for suspension, support the bottom of the
heater with plywood or other appropriately placed material. If the bottom is not supported, damage could occur.
Determine type of suspension to be used:
• All Sizes - The heater is equipped with four-point suspension. Two
3/8"-16 threaded nut retainers are located on each side of the heater.
See Dimensions in Paragraph 8 and illustration in Figure 2A.
• Sizes 45, 60, and 75 may be installed with two-point suspension.
Follow the illustrated instructions in Figure 2B, page 4.
• Sizes 45, 60, and 75 may be suspended using an optional ceiling
suspension kit. Refer to Figure 2C. Step-by-step instructions are
included with the option kit.
WARNING: Suspend any size of Model SFT
heater from the threaded nut retainers (Figure
2A). Or , suspend a Size 45, 60, or 75 as illustrated
in Figure 2B or using the Ceiling Suspension Kit
in Figure 2C.
DO NOT suspend any heater from the heater
cabinet panels.
Form RZ -NA-I-SFT, Mfg No. 173474 (Rev 6), Page 3
7. Suspending the Heater
(cont'd)
WARNING: Unit must be level for
proper operation. Do not place or add
additional weight to the suspended
heater. See Hazard Levels, page 2.
Figure 2A - Four-point Suspension
(applies to all sizes)
Be sure that the
threaded hanger rods
are locked to the
heater as illustrated.
Recommended
maximum hanger rod
length is 6 feet
(1829mm).
Add a 3/8 nut
to lock the hanger
rod to the heater
3/8 Threaded Rod
Figure 2B - Two-point
Suspension - Applies to
Sizes 45, 60, and 75 only
On the bottom of the heater, use a washer
and double nuts to attach each threaded rod.
Use double nuts. Lock lower nut to upper by
holding upper nut while tightening lower nut.
9-9/16
(243mm)
C
L
5/16 or 3/8 threaded rods
(maximum length above
the heater is 18/457mm )
17-15/16
(456mm)
C
L
Sizes 45 --
12-1/8 (308mm)
Sizes 60/75 --
18-1/8 (591mm)
Sizes 45 --
21-1/4 (540mm)
Sizes 60/75 --
23-1/4 (591mm)
Figure 2C - Suspending with Ceiling Suspension Kit, Option CK22.
When suspending, use a minimum of two anchor points per angle.
NOTES: Quantity of screws used to attach the suspension angles
will vary by heater size and from front to rear of
cabinet. If optional vertical louvers
are being added,
install louvers
after suspension
angles are attached.
Attach suspension angle -
(1) Remove ALL screws
across top edge of cabinet.
(2) Position suspension angle, aligning
holes with same holes emptied in Step (1).
(3) Using ALL screws that were
removed and the same cabinet
holes, attach suspension angle.
Form RZ -NA-I-SFT, Page 4
Suspension angle
attached to rear
of heater
8. Dimensions
Figure 1
U
V
T
Hanger
Location
E
B
F
S
Top View
C
A
4-pt suspension points
3/8-16 cage nuts
Front
View
Air Inlet
Flue Outlet
L
Air Inlet
K
Flue Outlet
L
M
K
P
R
Field wiring connections
Gas Connection 1/2
N
Rear View - Model SFT 45-125
P
R
G
J
H
Right Side
View
M
Gas
Connection
1/2 Sizes 150-200
3/4 Sizes 250-300
N
Rear View - Model SFT 150-300
Field wiring connections
Dimensions (inches ± 1/8")
Size A B C D E F G H J K L M N P R S T U V
45 29-5/8 12-1/8 15 2-5/8 1 10-1/8 26-1/4 21-1/4 3/8 4 3 5-3/4 7-5/8 10 6 18 16 1/ 2 3/4
60-75 29-5/8 18-1/8 15 2-5/8 2-1/2 16-1/8 31-3/8 23-1/4 3 / 8 5 4 10-1/2 8 10 9 18 16 1/ 2 3/4
100 38 22 20-5/8 2-1/4 5 12 33-1/2 25-3/8 1 5 4 11 9-1/2 13-1/4 11 24-1/4 16 1/2 4-5/8
125 38 22 20-5/8 2-1/4 3-5/8 14-3/4 33-1/2 25-3/8 1 5 4 11 9-1/2 13-1/4 11 24-1/4 16 1/ 2 4-5/8
150 38 33 20-5/8 2 6 21 34 25-3/8 1 5 5 21-3/4 9-1/4 13 16-1/2 24-1/4 1 6 1/2 4-5/8
200 38 33 20-5/8 2 4-1/2 24 34 25-3/8 1 5 5 21-3/4 9-1/4 13 16-1/2 24-1/4 16 1/2 4-5/8
250 51-1/4 33 34-1/2 2 4-1/2 21 35-3/8 25-3/8 1 5 5 21-1/2 9-1/4 15-1/8 16-1/2 29-3/8 16 8-1/2 4-5/8
300 51-1/4 33 34-1/2 2 4-1/2 24 35-3/8 25-3/8 1 6 6 22 9-1/4 15-1/8 16-1/2 29-3/8 16 8-1/2 4-5/8
Dimensions (mm ± 3)
Size A B C D E F G H J K L M N P R S T U V
45 752 308 381 67 25 257 667 540 10 102 76 146 194 254 152 457 406 13 19
60-75 752 308 381 67 64 410 797 591 10 127 102 267 203 254 229 457 406 13 19
100 965 559 524 57 127 305 851 645 25 127 102 279 241 337 279 616 406 13 117
125 965 559 524 57 92 375 851 645 25 127 102 279 241 337 279 616 406 13 117
150 965 559 524 51 152 533 864 645 25 127 127 552 241 330 419 616 406 13 117
200 965 559 524 51 114 610 864 645 25 127 127 552 241 330 419 616 406 13 117
250 1302 559 876 5 1 114 533 899 645 25 127 127 546 241 384 419 746 406 216 117
300 1302 559 876 5 1 114 610 899 645 25 152 152 559 241 384 419 746 406 216 117
Form RZ -NA-I-SFT, Mfg No. 173474 (Rev 6), Page 5
9. V enting and Combustion Air
All separated combustion, power vented units MUST BE equipped with both combustion air and exhaust piping to the outdoors. The unique
concentric adapter assembly required with this heater allows for both combustion air and exhaust piping with only one horizontal or vertical
penetration hole in the building.
Installation should be done by a qualified agency in accordance with these instructions. The qualified service agency installing this separatedcombustion system is responsible for the installation.
The systems illustrated in this manual are the only venting/combustion air systems approved for a Model SFT heater.
Hazards of Chlorine - The presence of chlorine vapors in the combustion air of gas-fired 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 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 terminals 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: 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).
Specific Venting Requirements (read all before installing)
1. Concentric Adapter Kit (ordered with the heater as either Option CC2 or Option CC6)
All Model SFT installations require a concentric adapter kit. Each kit includes the concentric adapter box (See Figure 4), a vent terminal cap, and
an inlet air guard or cap. Follow the instructions on pages 7 - 9 to install a horizontal vent/combustion air system (Option CC6). Follow the
instructions on pages 10 - 11 to install a vertical vent/combustion air system (Option CC2).
The vent/combustion air systems illustrated in Figure 6D or 7E are the only venting/combustion air systems appr oved for this heater.
Figure 4A - Concentric Adapter Box Required with all Model SFT Installations
(included in both Option CC2 and Option CC6)
View of Vent Terminal Connection Side
Collar for outside portion of the combustion
air pipe (vent pipe extends through the box
internally concentric to the outside portion
of the combustion air pipe)
View of Heater Connection Side
Collar for
connecting
indoor portion
of the
combustion air
Install rubber
seal for vent pipe
pipe
End View
H
2 (51mm)
6 (152mm)
2 (51mm)
F
Figure 4B - Concentric Adapter Box
Dimensions - inches (mm)
SFT 45-125 150-250 30 0
A 4 (102) 5 (127) 6 (152)
B 4 (102) 4 (102) 5 (127)
C 3 (76) 4 (102) 4 (102)
D 5-1/2 (140) 7-1/2 (191) 7-1/2 (191)
E 3-1/2 (89) 5 (127) 5 (127)
F 4 (102) 4 (102) 5 (127)
G 12 (305) 16-1/2 (419) 16-1/2 (419)
H 8 (203) 8 (203) 10 (254)
J 6 (152) 6 (152) 8 (203)
J = Diameter of the Collar for
attaching the "Outside" Portion of
the Combustion Air Pipe
Top View of the Concentric
Adapter Box Showing Air Flow
= Combustion Air Flow
= Exhaust (Vent) Gas Flow
Field-supplied vent
pipe passes through
the rubber seal and
extends out both sides
of the concentric
adapter box.
A = Diameter of the
Collar for attaching the
Combustion Air Pipe
from the Heater
E
B
D
C
Side View - Side of the
Adapter Box that
Connects to the Heater
2. Type of Pipe (field-supplied)
Vent Pipe - the type of vent pipe required depends on the type of installation.
Type of COMMERCIAL/INDUSTRIAL (Harmonized ANSI Z83.8-1996 RESIDENTIAL (CSA Requirement 10-96)
Installation and Canadian Standard CAN/CGA A 2.6-M96) - Applies to all Applies to Model SFT 45, 60, and 75 ONLY
sizes of Model SFT Heaters
Type of VENT Use either vent pipe approved for a Category III appliance OR Vent pipe approved for a Category III
Pipe Required single-wall, 26-gauge or heavier galvanized (or a material of appliance is required.
equivalent durability and corrosion resistance) vent pipe.
Form RZ -NA-I-SFT, Page 6
G
2. Type of Pipe (field-supplied) (cont'd)
Combustion Air Inlet Pipe Between the Heater and the Concentric
Adapter - Sealed, single-wall galvanized pipe is recommended.
Combustion Air Pipe Between the Adapter Box and the Combustion
Air Inlet - The vent pipe is internally concentric to the combustion air
pipe; use single-wall galvanized pipe for the combustion air pipe.
3. Pipe Diameter and Length - ft (M)
Maximum Pipe Length from Heater to Concentric
Adapter - minimum length is five feet (1524 mm)
Model Pipe Diameter Maximum 90° Elbow 45° Elbow
SFT V ent Inlet Air Length Equals* Equals*
45 3" or 4" 3" 30 ft (9.1M) 5 ft (1.5M) 2.5 ft (.8M)
60, 75, 4" or 4" 40 ft 5 ft 2.5 ft
100, 125 5" (12.1M) (1.5M) (.8M)
150, 200 5" 5" 40 ft (12.1M) 5 ft (1.5M) 2.5 ft (.8M)
250 5" 5" 50 ft (15.2M) 5 ft (1.5M) 2.5 ft (.8M)
300 6" 6" 50 ft (15.2M) 5 ft (1.5M) 2.5 ft (.8M)
*Reduce maximum length by this amount for each elbow .
Concentric Pipes (the vent pipe runs through the concentric adapter
extending internally concentric through the outdoor portion of the combustion air pipe) - Sizes 45 - 250 require 6" diameter combustion air pipe
for the outdoor portion and a 4" vent pipe through the concentric adapter
to the terminal; Size 300 requires an 8" diameter combustion air pipe for
the outdoor portion and a 5" diameter vent pipe through the concentric
adapter to the terminal. Refer to the installation instructions for the concentric adapter kit for length requirements.
4. Joints/Seals
In Pipe Runs - provide pipe as specified in Requirement No. 2 and make
joints as follows:
• If using single wall, 26-gauge or heavier galvanized pipe, secure
slip-fit pipe connections using sheetmetal screws or rivets. Seal all
joints. Seal combustion air pipe with pressure sensitive tape ordinarily used for warm-air ductwork. Wrap two full turns around each
joint. Seal flue exhaust pipe with either tape suitable for 550°F (such
as Option FA1, P/N 98266) or high-temperature (450°F) silicone sealant.
• If using Category III vent pipe, follow the pipe manufacturer's in-
structions for joining and sealing vent pipe sections.
In Concentric Pipes (outdoor portion) from the Adapter Box to Air
Inlet and Vent Terminal - Follow the instructions for concentric adapter
kit (pages 7 - 9 for a horizontal system or pages 10 - 110 for a vertical
system).
Joints Requiring Taper-type Connections (See Figure 5 and Tables
that follow) - When the diameter of the pipe in the inlet air or vent pipe
run is different from the connections at either the heater or the concentric adapter box, the joint must be made with a taper-type pipe
connector.
When the diameter change is at the heater, install the connector at
the collar or no more than 6" (152mm) from the heater.
When the diameter change is at the concentric adapter box, install
the connector no more than 6" (152mm) from the opening or collar
on the concentric adapter box.
Figure 5 - Use taper-type connections (see where
they are required below)
Reducer
Airflow
Tap er-type connector(s) required in the
SFT
Size
45
60-125
150-250 5" dia
300 6" dia
A taper-type connector is always
AIR PI PE
concentric adapter. When using 4" pipe, install th e r ed u cer at the heater. Other
sizes do n ot r equire a taper-type connection in the inlet air pip e r un.
Size
SFT
45
60-125 4" dia
150-250 5" dia
300 6" dia
Enlarger
Airflow
Venter
Vent
Pipe
Run
3" dia 4" to 3" Reducer 3" to 4" Enlarger
4" dia
4" dia 5" to 4" Reducer
5" dia
on Mo d el SFT 45. When using 3" pip e, install the reducer at t he
Inlet
Air
Pipe
3" dia 4" to 3" Reducer
4" dia
Reducer
Collar
to join venter collar
on
Heater
4" dia
5" dia
5" dia None
6" dia None
Air Inlet
Collar on
Concentric
Adapter
4" dia 3" dia
4" dia None None 4" dia
5" dia None None 5" dia
6" dia None None 6" dia
Reducer
to join concentric
adapter collar and
Taper-type Connector
Secure joints with sheetmetal
screws and seal.
VENT PIPE RUN
required
and pipe
None None
None
required
required
pipe
None
Taper-type
connection
to join different
diameter vent pipes
5" to 4" Reducer
5" to 4" Reducer
6" to 5" Reducer
in the indoor portion of the
Reducer
t o jo in heater
collar and pipe
4" to 3" Reducer
required
None
None
Either collar
or smaller
diameter pipe
req u ire d
Vent Pip e
through
Adapter
Box
4" dia
4" dia
4" dia
5" dia
INLET
Inlet Air
Collar at
Heater
5. Support
Support horizontal runs every six feet (1829mm); do not rely on the
heater or the adapter box for support of either horizontal or vertical
pipes. Use non-combustible supports on vent pipe.
6. Clearance
Do not enclose the vent pipe or place pipe closer than 6" (152mm)
to combustible material.
Instructions and Requirements for Installing a Horizontal Vent T erminal/Combustion Air
Inlet (Requires Concentric Adapter Kit, Option CC6)
Horizontal Vent
Terminal/Combustion
Air Package
(Option CC6)
includes:
Qty Size P/N Description
1 45-125 157157
150-250 157158
300 82131
1 45-125 155118
150-250 155392
300 68404
1 45-250 155096 Screened
300 53316
Complete Horizontal Vent Kit
(Same as Option CC6)
Concentric Adapter Box
Assemby (See Figure 3A)
Exhaust Assy
Qty S ize P/N Description
1 45-250 151755 Inlet
300 124940
4 45-300 37661
1 45-250 164492 4" I.D. Rubbe r Seal
1 300 1 64493 5" I.D. Rubber Sea l
1 45-300 53335
Form RZ -NA-I-SFT, Mfg No. 173474 (Rev 6), Page 7
Guard
#10-16 x 1/2" lg Screws to
attach the in let guard
Tube of High Temperature
(450°F) Silicon e Sealant
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