Lennox SL280135V60D, SL280UH090V48B, SL280UH110V60C, SL280UH060NV36A, SL280UH100NV60C Installation Instructions Manual

...
© 2017 Lennox Industries Inc.
UPFLOW
HORIZONTAL LEFT HORIZONTAL RIGHT
AIR FLOW
AIR FLOWAIR FLOW
Dallas, Texas USA
INSTALLATION INSTRUCTIONS SL280UHV
507337-01 04/2017 Supersedes 05/2016
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in man­uals, be alert to the potential for personal injury or death.
CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.
WARNING
Table of Contents
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Parts Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SL280UHV Gas Furnace . . . . . . . . . . . . . . . . . . . . . . . . . 4
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Use of Furnace as a Construction Heater . . . . . . . . . . . 5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Combustion, Dilution & Ventilation Air . . . . . . . . . . . . . . 6
Setting Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Duct System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
NOTICE
A thermostat is not included and must be ordered separately.
• The Lennox icomfort Wi-Fi® thermostat must be used
in communicating applications.
In non-communicating applications, the Lennox
ComfortSense® 7500 thermostat may be used, as well as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system operation.
Field wiring for both communicating and non­communicating applications is illustrated in diagrams, which begin on Page 25.
Integrated Control Settings . . . . . . . . . . . . . . . . . . . . . . . 33
Blower Performance Data . . . . . . . . . . . . . . . . . . . . . . . . 36
Unit Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Gas Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . 42
Proper Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
High Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Other Unit Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Heating Sequence of Operation . . . . . . . . . . . . . . . . . . . 44
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Repair Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Integrated Control Diagnostic Codes . . . . . . . . . . . . . . . 49
Program Unit Capacity/Size Mode . . . . . . . . . . . . . . . . . 55
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Page 1
Unit Dimensions - inches (mm)
(19)
FRONT VIEW SIDE VIEW
1
NOTE - 60C and 60D size units that require second stage
air volumes over 1800 cfm (850 L/s) must have one of the following:
1. Single side return air with transition, to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) cleanable air filter. Required to maintain proper air velocity.
2. Single side return air with optional Return Air Base
3. Bottom return air.
4. Return air from both sides.
5. Bottom and
one side return air.
See Blower Performance Ta bles for additional information.
2
Flue outlet may be horizontal but furnace must be vented vertically
3
Optional External Side Return Air Filter Kit is not for use
with the optional Return Air Base.
A
B
9/16 (14)
3
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
33
(838)
D
FLUE OUTLET
(Top)
3
OPTIONAL
EXTERNAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
1-1/2 (38)
Front Panel
3 (76) Right 7 (178) Left
9-1/8 (232) Right
8-5/8 (219) Left
5-3/8 (137) Right
2-3/16 (56) Left
3-1/8 (79)
TOP VIEW
3-1/4 (83)
2
FLUE OUTLET
(Either Side)
GAS PIPING INLET
(Either Side)
ELECTRICAL INLET
(Either Side)
SUPPLY AIR
OPENING
23-3/4
(603)
25
(635)
27-3/4
(705)
19-7/16
(494)
9/16
(14)
23
14-3/4
(375)
16
(406)
AIR FLOW
5/8
3/4
Model No.
SL280UH070V36A 14 368 13-3/8 340 13 330 4-3/4 121 SL280UH090V36B
SL280UH090V48B SL280UH09060C SL280UH110V60C SL280135V60D 24-1/2 622 23-3/8 546 23 584 9-3/4 248
C
1
Bottom Return
Air Opening
17-1/2 446 16-3/8 416 16 406 6-1/4 159
in. mm in mm in mm in mm
A B C D
21 533 19-7/8 504 19-1/2 495 8 203
3/4
(19)
(16)
3-1/4
(83)
(584)
1
Side Return Air Opening (Either Side)
23-1/2
(597)
1
Bottom Return
Air Opening
14
(356)
1-15/16 (49)
Page 2
1-1/2
(38)
Parts Arrangement
COMBUSTION AIR INDUCER
COMBUSTION AIR INDUCER
PRESSURE SWITCH
HEAT EXCHANGER
BURNER BOX
INNER BLOWER ACCESS PANEL
GAS VALV E
ACCESS PANEL
SIGHT GLASS
CABINET
CONTROL BOX
(Includes two-stage integrated control,
transformer and circuit breaker)
BLOWER
ASSEMBLY
FIGURE 1
Page 3
SL280UHV Gas Furnace
The SL280UHV gas furnace is equipped with a two-stage, variable speed integrated control. the control is compati­ble with:
Communicating thermostats - icomfort Wi-Fi®. Non-comunicating thermostats - ComfortSense or other
conventional thermostats. Control systems - Harmony III™ Zone Control System
(non-communicating). Each SL280UHV unit is shipped ready for installation in
the upow or horizontal position (left or right). The furnace
is shipped with the bottom panel in place. The bottom panel must be removed if the unit is to be installed in a horizontal application. The panel may also be removed in
upow applications.
Shipping and Packing List
Package 1 of 1 contains
1 - Assembled SL280UHV unit 1 - Bag assembly containing the following: 2 - Screws 1 - Snap bushing 1 - Snap plug 1 - Wire tie 1 -Vent warning label 1 - Owner’s manual and warranty card
The following items may be ordered separately:
1 - Thermostat 1 -Suspension Kit (for horizontal installations) 1 - Propane/LP changeover kit 1 - Return air base 1 - High altitude kit
1 - Side lter kit
Check equipment for shipping damage. If you nd any
damage, immediately contact the last carrier.
Safety Information
WARNING
Danger of explosion. There are circumstances in which odorant
used with LP/propane gas can lose its scent. In case of a leak, LP/propane gas will settle
close to the oor and may be difcult to
smell. An LP/propane leak detector should be installed in all LP applications.
WARNING
CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.
Certications
SL280UHV units are CSA International certied to ANSI
Z21.47. In the USA, installation of gas furnaces must conform with
local building codes. In the absence of local codes, units must be installed according to the current National Fuel Gas Code (ANSI-Z223.1). The National Fuel Gas Code is available from the following address:
American National Standards Institute, Inc. 11 West 42nd Street New York, NY 10036
Clearances
Adequate clearance must be made around the air open­ings into the vestibule area. In order to ensure proper unit operation, combustion and ventilation air supply must be provided according to the current National Fuel Gas Code.
Vent installations must be consistent with the venting ta­bles (in this instruction) and applicable provisions of local building codes.
This furnace is CSA International certied for installation
clearances to combustible material as listed on the unit nameplate and in the tables in gures 7 and 11. Accessi­bility and service clearances must take precedence over
re protection clearances.
NOTE - For installation on combustible oors, the furnace shall not be installed directly on carpeting, tile, or other combustible material other than wood ooring.
Installed Locations
For installation in a residential garage, the furnace must be installed so that the burner(s) and the ignition source are located no less than 18 inches (457 mm) above the
oor. The furnace must be located or protected to avoid
physical damage by vehicles. When a furnace is installed in a public garage, hangar, or other building that has a hazardous atmosphere, the furnace must be installed ac­cording to recommended good practice requirements and current National Fuel Gas Code.
Temperature Rise
NOTE - Furnace must be adjusted to obtain a temperature rise(high and low re) within the range(s) specied on the unit nameplate. Failure to do so may cause erratic lim­it operation and may result in premature heat exchanger failure.
This SL280UHV furnace must be installed so that its elec­trical components are protected from water.
Page 4
Installed in Combination with a Cooling Coil
When this furnace is used with cooling units, it shall be in­stalled in parallel with, or on the upstream side of, cooling units to avoid condensation in the heating compartment.
See gure 1. With a parallel ow arrangement, a damper (or other means to control the ow of air) must adequately
prevent chilled air from entering the furnace. If the damper is manually operated, it must be equipped to prevent op­eration of either the heating or the cooling unit, unless it is
in the full HEAT or COOL setting. See gure 1.
Heating Unit Installed Parallell to Air Handler Unit
Dampers
(open during heating operation only)
Gas Unit
Air Handler Unit
Dampers
(open during cooling operation only)
Heating Unit Installed Upstream of Cooling Unit
Gas Unit
Evaporator
FIGURE 2
When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, installation must conform with the current National Elec­tric Code, ANSI/NFPA No. 70. The National Electric Code (ANSI/NFPA No. 70) is available from the following ad­dress:
National Fire Protection Association 1 Battery March Park Quincy, MA 02269 NOTE - This furnace is designed for a minimum contin-
uous return air temperature of 60°F (16°C) or an inter­mittent operation down to 55°F (13°C) dry bulb for cases where a night setback thermostat is used. Return air tem­perature must not exceed 85°F (29°C) dry bulb.
The SL280UHV furnace may be installed in alcoves, clos­ets, attics, basements, garages, and utility rooms in the
upow or horizontal position.
This furnace is not designed for installation in mobile homes, recreational vehicles, or outdoors.
Never use an open ame to test for gas leaks. Check all
connections using a commercially available soap solution
made specically for leak detection.
operation of the unit with clogged or misplaced lters will
damage the unit. SL280UHV units may be used for heating of buildings or
structures under construction, if the following conditions are met:
• The vent system must be permanently installed per these installation instructions.
• A room thermostat must control the furnace. The use of
xed jumpers that will provide continuous heating is not
allowed.
• The return air duct must be provided and sealed to the furnace.
• Return air temperature range between 60°F (16°C) and 80°F (27°C) must be maintained.
Air lters must be installed in the system and must be maintained during construction.
Air lters must be replaced upon construction comple- tion.
• The input rate and temperature rise must be set per the furnace rating plate.
• One hundred percent (100%) outdoor air must be pro­vided for combustion air requirements during construc­tion. Temporary ducting may supply outdoor air to the furnace. Do not connect duct directly to the furnace. Size the temporary duct following these instructions in section for Combustion, Dilution and Ventilation Air in a
conned space with air from outside.
• The furnace heat exchanger, components, duct sys-
tem, air lters and evaporator coils must be thoroughly cleaned following nal construction clean-up.
• All furnace operating conditions (including ignition, input rate, temperature rise and venting) must be veried ac­cording to these installation instructions.
General
These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.
In addition to the requirements outlined previously, the following general recommendations must be considered when installing a SL280UHV furnace:
• Place the furnace as close to the center of the air distri­bution system as possible. The furnace should also be located close to the chimney or vent termination point.
• Do not install the furnace where drafts might blow di­rectly into it. This could cause improper combustion and unsafe operation.
Use of Furnace as Construction Heater
Lennox does not recommend the use of SL280UHV units as a construction heater during any phase of construc­tion. Very low return air temperatures, harmful vapors and
Page 5
• Do not block the furnace combustion air openings with clothing, boxes, doors, etc. Air is needed for proper combustion and safe unit operation.
• When the furnace is installed in an attic or other insulat­ed space, keep insulation away from the furnace.
• Please consult the manufacturer of your evaporator coil for their recommendations on distance required between the heat exchanger and their drain pan. Ad­equate space must be provided between the drain pan and the furnace heat exchanger.
NOTE - The Commonwealth of Massachusetts stipu­lates these additional requirements:
• Gas furnaces shall be installed by a licensed plumber
or tter only.
• The gas cock must be “T handle” type.
• When a furnace is installed in an attic, the passageway
to and service area surrounding the equipment shall
be oored.
WARNING
This prodcut contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.
Combustion, Dilution & Ventilation Air
In the past, there was no problem in bringing in sufcient outdoor air for combustion. Inltration provided all the air
that was needed. In today’s homes, tight construction practices make it necessary to bring in air from outside for combustion. Take into account that exhaust fans, appli-
ance vents, chimneys, and replaces force additional air
that could be used for combustion out of the house. Un­less outside air is brought into the house for combustion, negative pressure (outside pressure is greater than inside pressure) will build to the point that a downdraft can oc­cur in the furnace vent pipe or chimney. As a result, com­bustion gases enter the living space creating a potentially dangerous situation.
In the absence of local codes concerning air for combus­tion and ventilation, use the guidelines and procedures in
this section to install SL280UHV furnaces to ensure ef­cient and safe operation. You must consider combustion air needs and requirements for exhaust vents and gas piping. A portion of this information has been reprinted
with permission from the National Fuel Gas Code (ANSI‐
Z223.1). This reprinted material is not the complete and
ofcial position of the ANSI on the referenced subject,
which is represented only by the standard in its entirety.
CAUTION
Do not install the furnace in a corrosive or contaminated atmosphere. Meet all combustion and ventilation air
requirements, as well as all local codes.
CAUTION
Insufcient combustion air can cause headaches,
nausea, dizziness or asphyxiation. It will also cause excess water in the heat exchanger resulting in rusting
and premature heat exchanger failure. Excessive exposure to contaminated combustion air will result in safety and performance related problems. Avoid exposure to the following substances in the combustion air supply:
Permanent wave solutions Chlorinated waxes and cleaners Chlorine base swimming pool chemicals Water softening chemicals De-icing salts or chemicals Carbon tetrachloride Halogen type refrigerants Cleaning solvents (such as perchloroethylene) Printing inks, paint removers, varnishes, etc. Hydrochloric acid Cements and glues Antistatic fabric softeners for clothes dryers Masonry acid washing materials ermanent waves
All gas-red appliances require air for the combustion process. If sufcient combustion air is not available, the furnace or other appliances will operate inefciently and
unsafely. Enough air must be provided to meet the needs of all fuel-burning appliances and appliances such as ex­haust fans which force air out of the house. When re­places, exhaust fans, or clothes dryers are used at the same time as the furnace, much more air is necessary to ensure proper combustion and to prevent a downdraft.
Insufcient air causes incomplete combustion which can
result in carbon monoxide. In addition to providing combustion air, fresh outdoor air
dilutes contaminants in the indoor air. These contaminants may include bleaches, adhesives, detergents, solvents
and other contaminants which can corrode furnace com­ponents.
The requirements for providing air for combustion and ventilation depend largely on whether the furnace is in-
stalled in an unconned or a conned space.
Page 6
Unconned Space
EQUIPMENT IN CONFINED
SPACE ALL AIR FROM INSIDE
CHIMNEY
OR GAS
VENT
FURNACE
WATER
HEATER
OPENINGS
(To Adjacent
Room)
NOTE - Each opening shall have a free area of at least one square inch (645 mm
2
ing of all equipment in the enclosure, but not less than 100 square inches (64516 mm
2
).
AIR FLOW
An unconned space is an area such as a basement or
large equipment room with a volume greater than 50 cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the com­bined input rating of all appliances installed in that space. This space also includes adjacent rooms which are not separated by a door. Though an area may appear to be
unconned, it might be necessary to bring in outdoor air
for combustion if the structure does not provide enough air
by inltration. If the furnace is located in a building of tight
construction with weather stripping and caulking around the windows and doors, follow the procedures in the air from outside section.
Conned Space
A conned space is an area with a volume less than 50
cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the combined input rating of all appliances installed in that
space. This denition includes furnace closets or small
equipment rooms. When the furnace is installed so that supply ducts carry
air circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace. This is especially important when the furnace is mounted on
a platform in a conned space such as a closet or small
equipment room. Even a small leak around the base of the unit at the platform or at the return air duct connection can cause a potentially dangerous negative pressure con­dition. Air for combustion and ventilation can be brought
into the conned space either from inside the building or
from outside.
Air from Inside
If the conned space that houses the furnace adjoins a space categorized as unconned, air can be brought in by
providing two permanent openings between the two spac­es. Each opening must have a minimum free area of 1 square inch (645 mm2) per 1,000 Btu (.29 kW) per hour of
total input rating of all gas-red equipment in the conned
space. Each opening must be at least 100 square inches (64516 mm2). One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12
inches (305 mm) of the bottom. See gure 3.
Air from Outside If air from outside is brought in for combustion and ventila-
tion, the conned space must have two permanent open­ings. One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. These openings must communi­cate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or in­directly through vertical ducts. Each opening shall have a minimum free area of 1 square inch (645 mm2) per 4,000 Btu (1.17 kW) per hour of total input rating of all equipment in the enclosure. See gures 4 and 5. When communi­cating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch (645 mm2) per 2,000 Btu (.56 kW) per total input rating of
all equipment in the enclosure. See gure 6.
When ducts are used, they shall be of the same cross-sec­tional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In calculating free
area, the blocking effect of louvers, grilles, or screens must be considered. If the design and free area of protec­tive covering is not known for calculating the size opening required, it may be assumed that wood louvers will have 20 to 25 percent free area and metal louvers and grilles will have 60 to 75 percent free area. Louvers and grilles
must be xed in the open position or interlocked with the
equipment so that they are opened automatically during equipment operation.
FIGURE 3
Page 7
other equipment in the enclosure.
CHIMNEY OR
GAS VENT
FURNACE
(Inlet Air from Crawlspace and Outlet Air to Ventilated Attic)
VENTILATION LOUVERS
(Each end of attic)
EQUIPMENT IN CONFINED SPACE
ALL AIR FROM OUTSIDE
OUTLET
AIR
WATER
HEATER
CHIMNEY
OR GAS
VENT
FURNACE
VENTILATION
LOUVERS
(For unheated crawl space)
AIR FLOW
NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch (645
2
mm
) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.
INLET
AIR
FIGURE 4
EQUIPMENT IN CONFINED SPACE
ALL AIR FROM OUTSIDE
(All Air Through Ventilated Attic)
CHIMNEY
OR GAS
VENT
OUTLET
AIR
VENTILATION LOUVERS
(Each end of attic)
INLET AIR
(Ends 12 in.
above bottom)
FURNACE
WATER
HEATER
EQUIPMENT IN
CONFINED SPACE
ALL AIR FROM
OUTSIDE
OUTLET AIR
AIR FLOW
NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm
ment in the enclosure.
FIGURE 5
WATER
HEATER
2
) per 4,000
Page 8
AIR FLOW
NOTE - Each air duct opening shall have a free area of at least one square inch (645 mm
2
) per 2,000 Btu (.59 kW) per hour of
INLET AIR
the total input rating of all equipment in the enclosure. If the equipment room is located against an outside wall and the air openings ing shall have a free area of at least one square inch (645 mm per 4,000 Btu (1.17 kW) per hour of the total input rating of all
FIGURE 6
2
)
Setting Equipment
WARNING
Do not install the furnace on its front or its back. Do not connect the return air ducts to the back of the furnace. Doing so will adversely affect the operation of the safety control devices, which could result in personal injury or death.
.The SL280UHV gas furnace can be installed as shipped
in either the upow position or the horizontal position.
Select a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, and installation and service clearances [24 inches (610 mm) at unit front]. The unit must be level.
NOTE - Units with 1/2 hp blower motors are equipped with three exible legs and one rigid leg. See gure 7. The rigid leg is equipped with a shipping bolt and a at white plastic washer (rather than the rubber mounting grommet used with a exible mounting leg). The bolt and washer must
be removed before the furnace is placed into opera­tion. After the bolt and washer have been removed, the
rigid leg will not touch the blower housing.
SL280UHV07036A and
SL280UHV09036B WITH 1/2 HP
BLOWER MOTOR
RIGID LEG
remove shipping bolt and washer
Upow Applications
Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in gure 8.
Upflow Application Installation Clearances
Top
Left Side
AIR FLOW
Bottom
Type of Vent
Connector
Top 1 in. (25 mm) 1 in. (25 mm)
*Front 2-1/4 in. (57 mm)** 2-1/4 in. (57 mm)
Back 0 0
Sides 0 0
Vent 6 in. (152 mm) 1 in. (25 mm)
Floor 0 0
*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. ** 3-1/4 in. if single wall vent pipe is used. For installation on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring. Left side requires 3 inches if a single wall vent is used on 14-1/2 inch nets.
Type C Type B1
Right Side
FIGURE 7
FIGURE 8
Page 9
Return Air -- Upow Applications
Transition
Return air can be brought in through the bottom or either
side of the furnace installed in an upow application. If the
furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely. The furnace is equipped with a removable bottom panel to facilitate installation.
Markings are provided on both sides of the furnace cab­inet for installations that require side return air. Cut the furnace cabinet at the maximum dimensions shown on page 2.
NOTE - 60C and 60D units that require air volumes over 1800 cfm (850 L/s) must have one of the follow­ing:
1 - Return air from single side with transition which
willaccommodate 20 x 25 x 1 in. (508 x 635 x 25
mm) cleanable air lter. (Required to maintain proper air velocity.See gure 9.
2 - Return air from single side with optional RAB
Return Air Base. See gure 10.
3 -Return air from bottom and one side. 4 -Return air from both sides. 5 -Return air from bottom.
Refer to Engineering Handbook for additional information.
Single Side Return Air
(with transition and filter)
20” X 25” X 1”
(508mm X635mm X 25mm)
Cleanable Filter
Return Air
Plenum
AIR FLOW
FIGURE 9
(Upflow Applications Only -- For use with A, B, C and D cabinets)
Optional Return Air Base
FURNACE
FRONT
IF BASE IS USED
WITHOUT
INDOOR AIR
AIR FLOW
14−1/2” (368) A Width (65W75)
17−1/2” (446) B Width (50W98)
21”− (533) C Width (50W99)
24−1/2”− (622) D Width (51W00)
NOTE- Optional Side Return Air Filter Kits are not for use with Optional Return Air Base.
1
Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet. Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm). The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown. Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air opening. The size of the opening must not extend beyond the markings on the furnace cabinet.
2
To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.
OPTIONAL
RETURN AIR BASE
IAQ CABINET,
A SINGLE
RETURN AIR
PLENUM
MUST
COVER BOTH
UNIT AND
RETURN
AIR BASE
OPENINGS
3−1/4
(83)
7−1/4 (184)
1
23 (584)
Overall
(Maximum)
1
Unit side return air
Opening
5−5/8 (143)
SIDE RETURN
AIR OPENINGS
(Either Side)
26−7/8
(683)
SIDE VIEW
23
(584)
1
Minimum
11 (279)
2
Maximum
14 (356)
1
22−7/16
(570)
Overall
(Maximum)
3/4
(19)
FIGURE 10
Page 10
Removing the Bottom Panel
Removing the Bottom Panel
Screw
Bottom Panel
Bottom Cap
Hori
zontal Application
Installation Clearances
Top
Bottom
Left End
Right End
AIR FLOW
Vent Connector
Type
Type C Type B1
Top 0 0
*Front 2-1/4 in. (57 mm)** 2-14 in. (57 mm)
Back 0 0
Ends 2 in. (51 mm) 2 in. (51 mm)
Vent 6 in. (152 mm) 1 in. (25 mm)
Floor 0 0
*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. ** 3-1/4 in. if single wall vent pipe is used. For installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring.
Typical Horizontal Application
Unit Suspended in Attic or Crawlspace
Bracket
Bottom Cap
Metal Strap
3/16 inch
Air Flow
Remove the two screws that secure the bottom cap to the furnace. Pivot the bottom cap down to release the bottom panel. Once the bottom panel has been removed, reinstall
the bottom cap. See gure 11.
Horizontal Applications
The SL280UHV furnace can be installed in horizontal ap­plications. Order kit number 51W10 (or use equivalent) from Lennox.
Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in gure 12.
This furnace may be installed in either an attic or a crawl­space. Either suspend the furnace from roof rafters or
oor joists, as shown in gure 13, or install the furnace on a platform, as shown in gure 14.
Figure 11
FIGURE 12
FIGURE 13
. NOTE - Heavy-gauge perforated sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists. When straps are used to suspend the unit in this way, support must be provided for both the ends. The straps must not interfere with the plenum or exhaust pip­ing installation. Cooling coils and supply and return air
plenums must be supported separately. NOTE - When the furnace is installed on a platform in a
crawlspace, it must be elevated enough to avoid water damage and to allow the evaporator coil to drain.
Return Air -- Horizontal Applications
Return air must be brought in through the end of a fur­nace installed in a horizontal application. The furnace is equipped with a removable bottom panel to facilitate in-
stallation. See gure 11.
CAUTION
If this unit is being installed in a space serviced by an exhaust fan, power exhaust fan, or other device which may create a negative pressure in the space, take care when sizing the inlet air opening. The inlet air opening must be sized to accommodate the maximum volume of exhausted air as well as the maximum volume of combustion air required for all gas appliances serviced by this space.
Page 11
Horizontal Application
Unit Installed on Platform
clearances.
GAS
ENTRY
VENT
PIPE
See the unit nameplate for
Line contact is permissible
SERVICE PLATFORM
Improper installation of the furnace can result in
personal injury or death. Combustion and ue products
must never be allowed to enter the return air system or the living space. Use screws and joint tape to seal the return air system to the furnace. In platform installations with bottom return air, the furnace should be sealed airtight to the return air plenum. A door must never be used as a portion of the return air duct system. The base must provide a stable support and an airtight seal to the furnace. Allow absolutely no sagging, cracks, gaps, etc. The return and supply air duct systems must never be connected to or from other heating devices such as a
replace or stove, etc. Fire, explosion, carbon monoxide
poisoning, personal injury and/or property damage could result.
The inner blower panel must be securely in place when the blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.
Filters
This unit is not equipped with a lter or rack. A eld-pro­vided high-velocity lter is required for the unit to operate properly. Table 1 lists recommended lter sizes.
A lter must be in place any time the unit is operating.
FIGURE 14
WARNING
WARNING
WARNING
If a highefciency lter is being installed as part of this system to ensure better indoor air quality, the lter must be properly sized. Highefciency lters have a higher static pressure drop than standardefciency glass/foam lters. If the pressure drop is too great, system capacity
and performance may be reduced. The pressure drop may also cause the limit to trip more frequently during the winter and the indoor coil to freeze in the summer, resulting in an increase in the number of service calls.
Before using any lter with this system, check the specications provided by the lter manufacturer against
the data given in the appropriate Lennox Product
Specications bulletin. Additional information is provided
in Service and Application Note ACC002 (August 2000).
TABLE 1
Furnace Cabinet
Width
14-1/2” 16 X 25 X 1 (1) 14 X 25 X 1 (1)
17-1/2” 16 X 25 X 1 (1) 16 X 25 X 1 (1)
21” 16 X 25 X 1 (1) 20 X 25 X 1 (1)
24-1/2” 16 X 25 X 1 (2) 24 X 25 X 1 (1)
Side Return Bottom Return
Duct System
Use industry-approved standards (such as those pub­lished by Air Conditioning Contractors of America or Amer­ican Society of Heating, Refrigerating and Air Condition­ing Engineers) to size and install the supply and return air duct system. This will result in a quiet and low-static system that has uniform air distribution.
NOTE - Do not operate the furnace in the heating mode with an external static pressure that exceeds 0.8 inche w.c. Higher external static pressures may cause erratic limit operation.
Supply Air Plenum
If the furnace is installed without a cooling coil, a remov­able access panel must be installed in the supply air duct. The access panel should be large enough to permit in-
spection (either by smoke or reected light) of the heat
exchanger for leaks after the furnace is installed. The furnace access panel must always be in place when the furnace is operating and it must not allow leaks into the supply air duct system.
Return Air Plenum NOTE - Return air must not be drawn from a room
where this furnace, or any other gas-fueled appliance (i.e., water heater), or carbon monoxide- producing
device (i.e., wood replace) is installed.
When return air is drawn from a room, a negative pressure is created in the room. If a gas appliance is operating in
a room with negative pressure, the ue products can be
pulled back down the vent pipe and into the room. This
Filter Size
Page 12
reverse ow of the ue gas may result in incomplete com­bustion and the formation of carbon monoxide gas. This toxic gas might then be distributed throughout the house by the furnace duct system.
In upow applications, the return air can be brought in
through the bottom or either side of the furnace. If a fur­nace with bottom return air is installed on a platform, make an airtight seal between the bottom of the furnace and the platform to ensure that the unit operates properly and safely. Use berglass sealing strips, caulking, or equiva­lent sealing method between the plenum and the furnace
cabinet to ensure a tight seal. If a lter is installed, size the return air duct to t the lter frame.
Venting
A 4-inch diameter ue transition is factory-installed on
the combustion air inducer outlet of all models. Figure 16 shows the combustion air inducer as shipped from the factory.
Mounting Screws Location
mounting screws
2 - Use tin snips to cut preferred opening on the
cabine for repositioning the ue outlet. Use the cut
out piece as a cover plate to patch unused opening on cabinet.
UPFlow Position
UPFLOW POSITION
Top Vent Discharge
vent pipe
flue
transition
pressure
switch
make-up
box
collector box
mounting screw
FIGURE 15
IMPORTANT
The unit will not vent properly with the ue transition
pointed down in the 6 o’clock position. The combustion air inducer may be rotated clockwise or counterclockwise by 90° to allow for top or side vent discharge in all
applications. When the unit is installed, the ue transition
must be in the 9 o’clock, 12 o’clock or 3 o’clock position.
If necessary reposition the combustion air inducer, pres­sure switch and or make up box as needed per the follow-
ing steps and see gures 16 through 22.
1 - Remove the four mounting screws (gure 15)
whic secure the combustion air inducer / pressure
switch assembly to the orice plate. Lift and rotate
the assembly 90 degrees clockwise or counter clockwise to either the 3 o’clock position or to 9 o’clock position and re-secure with four screws. Gasket should be left in place.
FLOW
AIR
FIGURE 16
UPFLOW POSITION
Left Side Vent Discharge
cover plate
pressure
switch
vent pipe
flue
transition
FLOW
AIR
Gas supply piping must be brought into the unit from the right
side in order to accommodate the flue pipe. Remove make-up box assembly (2 screws) and cut wire tie to
free make-up box wires. Re-install make-up box on other side of cabinet.
Re-secure make-up box wires, either pulling excess wires through the blower compartment and securing with supplied wire tie, or coil excess wire and secure to the gas manifold.
collector box
make-up
box
FIGURE 17
Page 13
pressure switch
Right Side Vent Discharge
collector box
UPFLOW POSITION
cover plate
flue transition
HORIZONTAL LEFT POSITION
Side Vent Discharge
pressure switch
vent pipe
AIR
make-up
box
FLOW
AIR
Pressure switch tubing may be too long. Cut to
fit , then re-attach to barbed fitting on pressure switch. Tubing must not be allowed to sag.
FIGURE 18
HORIZONTAL LEFT POSITION
Top Vent Discharge
vent pipe
flue
transition
cover plate
pressure switch
AIR
FLOW
FLOW
flue transition
make-up box
Disconnect pressure switch hose from barbed fitting on the
pressure switch assembly. Remove pressure switch assembly (1 screw) and cut wire tie to free pressure switch wires. Re­install pressure switch on the other side of orifice plate and re­connect pressure switch hose.
Re-secure pressure switch wires by either pulling excess wires through the blower compartment and securing with supplied wire tie, or coil excess wire and secure to the gas manifold.
collector box
FIGURE 20
HORIZONTAL RIGHT POSITION
Top Vent Discharge
vent pipe
flue transition
AIR
pressure switch
cover plate
make-up box
Disconnect
sure switch assembly. Remove pressure switch assembly (1 screw) and cut wire tie to free pressure switch wires. Re-install pressure switch on the other side of orifice plate and re-connect pressure switch hose.
Re-secure pressure switch wires by either pulling excess wires through the blower compartment and securing with supplied wire tie or coil excess wire and secure to the gas manifold.
collector box
FIGURE 19
Page 14
FLOW
collector box
make-up box
Gas supply piping must be brought into the unit from the bottom
in order to accommodate the flue pipe. Remove make-up box assembly (2 screws) and cut wire tie to
free make-up box wires. Re-install make-up box on other side of cabinet.
Re-secure make-up box wires by either pulling excess wires through the blower compartment and securing with supplied wire tie, or coil excess wire and secure to the gas manifold.
FIGURE 21
AIR
V
HORIZONTAL RIGHT POSITION
Side Vent Discharge
pressure switch
ENT CONNECTION
VENT PIPE
(min. 6” length)
“DISCONNECTED VENT”
WARNING
STICKER
FLOW
make up box
FIGURE 22
The SL280UHV series units are classied as fan-assisted
Category I furnaces when vertically vented according to the latest edition of National Fuel Gas Code (NFPA 54 / ANSI Z223.1) in the USA. A fan-assisted Category I fur­nace is an appliance equipped with an integral mechan­ical means to either draw or force combustion products through the combustion chamber and/or heat exchanger. The SL280UHV is not approved for use with horizontal venting.
NOTE - Use these instructions as a guide. They do not supersede local codes. This furnace must be vented ac­cording to all local codes these installation instructions, and the provided venting tables in these instructions
The venting tables in this manual were extracted from the National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and are provided as a guide for proper vent installation. Proper application, termination, construction and location of vents must conform to local codes having jurisdiction. In the ab-
sence of local codes, the NFGC serves as the dening
document. Refer to the tables and the venting information contained
in these instructions to properly size and install the venting system.
flue transition
collector box
IMPORTANT
Once the venting system is installed, attach the “Disconnected Vent” warning sticker to a visible area
of the plenum near the vent pipe. See gure 23. The
warning sticker is provided in the bag assembly. Order kit 66W04 for additional stickers.
FLUE TRANSITION
COLLAR
FIGURE 23
Use self-drilling sheet metal screws or a mechanical fas-
tener to rmly secure the vent pipe to the round collar of the ue transition. If self-drilling screws are used to attach
the vent pipe, it is recommended that three be used. Drive one self-drilling screw through the front and one through
each side of the vent pipe and collar. See gures 20, 22 and 23. Install the rst vent connector elbow at a minimum
of six inches (152 mm) from the furnace vent outlet. See
gure 23.
Venting Using a Masonry Chimney
The following additional requirements apply when a lined masonry chimney is used to vent this furnace. Masonry chimneys used to vent Category I central furnaces must be either tile-lined or lined with a listed metal lining sys­tem or dedicated gas vent. Unlined masonry chimneys are
prohibited. See gures 24 and 25 for common venting.
A chimney with one or more sides exposed to the outside of the structure is considered to be an exterior chimney. An exterior masonry chimney that is not tile-lined must be
lined with B1 vent or a listed insulated exible metal vent.
An exterior tile-lined chimney that is sealed and capped
may be lined with a listed uninsulated exible metal vent.
If the existing chimney will not accommodate a listed met­al liner, either the chimney must be rebuilt to accommo­date one of these liners or an alternate approved venting method must be found.
Insulation for the exible vent pipe must be an encapsu­lated berglass sleeve recommended by the exible vent pipe manufacturer. See gure 24.
WARNING
Asphyxiation hazard. The exhaust vent for this furnace
must be securely connected to the furnace ue
transition at all times.
Page 15
Common Venting Using Metal-Lined Masonry Chimney
Common Venting Using Tile-Lined Interior Masonry Chimney and Combined Vent Connector
MINIMUM LENGTH = AS SHORT AS PRACTICAL. FOR MAXIMUM LENGTH SEE NOTE TO LEFT
INTERIOR TILE-LINED MASONRY CHIMNEY
NOTE - the chimney must be properly sized per provided venting tables or lined with listed metal lining system.
PERMANENTLY SEALED FIREPLACE OPENING
VENT
CONNECTOR
NOTE- Refer to provided venting tables for installations.
FURNACE
OTHER
APPLIANCE
AIR FLOW
SEALED
MAX. LENGTH
-- SEE NOTE 1
5 ft. (1.5 m)
minimum
VENT CONNECTOR
4 in. (102 mm)
minimum
OTHER
APPLIANCE
NOTE 1 - Refer to the provided venting tables for installations. Refer to the capacity requirements shown in the provided venting tables.
BELOW.
MIN. LENGTH -- AS
SHORT AS PRACTICAL
FURNACE
AIR FLOW
EXTERIOR
CHIMNEY WITH
METAL
LINER
PERMANENTLY
SEALED FIREPLACE
OPENING
FIGURE 24
DO NOT insulate the space between the liner and the chimney wall with puffed mica or any other loose granular insulating material
IMPORTANT
SINGLE appliance venting of a fan-assisted furnace into a tile-lined masonry chimney (interior or outside wall)
is PROHIBITED. The chimney must rst be lined with either type B1 vent or an insulated single wall exible
vent lining system which has been sized according to the provided venting tables and the vent pipe manufacturer’s instructions.
A fan-assisted furnace may be commonly vented into an existing lined masonry chimney if the following conditions are met:
• The chimney is currently serving at least one draft­hood equipped appliance
• The vent connectors and chimney are sized accord­ing to the provided venting tables.
If type B1 double-wall vent is used inside a chimney, no other appliance can be vented into the chimney. The out-
er wall of type B1 vent pipe must not be exposed to ue
products.
FIGURE 25
Page 16
A type B1 vent or masonry chimney liner shall terminate above the roof surface with a listed cap or a listed roof as­sembly according to the terms of their respective listings and the vent manufacturer’s instructions.
When inspection reveals that an existing chimney is not safe for the intended purpose, it shall be rebuilt to conform to nationally recognized standards, lined or relined with suitable materials, or replaced with a gas vent or chimney suitable for venting SL280UHV series units. The chimney passageway must be checked periodically to ensure that it is clear and free of obstructions.
Do not install a manual damper, barometric draft regulator,
or ue restrictor between the furnace and the chimney.
Never connect a Category I appliance to a chimney that is
servicing a solid-fuel appliance. If a replace chimney ue is used to vent this appliance, the replace opening must
be permanently sealed. A type B or listed chimney lining system that passes
through an unused masonry chimney ue is not consid­ered to be exposed to the outdoors.
General Venting Requirements
Vent all SL280UHV furnaces according to these instruc­tions:
1 - Vent diameter recommendations and maximum
allowable piping runs are found in the provided venting tables
2 - In no case should the vent or vent connector
diameter be less than the diameter specied in the
provided venting tables.
3 - The minimum vent capacity determined by the
sizing tables must be less than the low re input
rating and the maximum vent capacity must be
greater than the high re input rating.
4 - Single appliance vents - If the vertical vent or tile-
lined chimney has a larger diameter or ow area than
the vent connector, use the vertical vent diameter to determine the minimum vent capacity and the vent connector diameter to determine the maximum vent
capacity. The ow area of the vertical vent, however, shall not exceed 7 times the ow area of the listed
appliance categorized vent area, drafthood outlet
area or ue collar area unless designed according
to approved engineering methods.
5 - Multiple appliance vents - The ow area of the
largest section of vertical vent or chimney shall not exceed 7 times the smallest listed appliance
categorized vent area, drafthood outlet area or ue
collar area unless designed according to approved engineering methods.
6 - The entire length of single wall metal vent connector
shall be readily accessible for inspection, cleaning, and replacement.
7 - Single appliance venting congurations with zero
lateral lengths (table 3) are assumed to have no elbows in the vent system. For all other vent
congurations, the vent system is assumed to have
two 90° elbows. For each additional 90° elbow or equivalent (for example two 45° elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10% (0.90 x maximum listed capacity).
8 - The common venting tables (4 and 5) were
generated using a maximum horizontal vent connector length of 1-1/2 feet (.46 m) for each inch (25 mm) of connector diameter as follows:
TABLE 2
Connector Diameter
inches (mm)
3 (76) 4-1/2 (1.37)
4 (102) 6 (1.83)
5 (127) 7-1/2 (2.29)
6 (152) 10-1/2 (3.20)
7 (178) 10-1/2 (3.20)
Maximum Horizontal
Connector Length feet (m)
9 - If the common vertical vent is offset, the maximum
common vent capacity listed in the common venting tables should be reduced by 20%, the equivalent of two 90° elbows (0.80 x maximum common vent capacity). The horizontal length of the offset shall not exceed 1-1/2 feet (.46 m) for each inch (25 mm) of common vent diameter.
10 - The vent pipe should be as short as possible with
the least number of elbows and angles required to complete the job. Route the vent connector to the vent using the shortest possible route.
11 - A vent connector shall be supported without any
dips or sags and shall slope a minimum of 1/4 inch (6.4 mm) per linear foot (305 mm) of connector, back toward the appliance.
12 - Vent connectors shall be rmly attached to the
furnace ue collar by self-drilling screws or other
approved means, except vent connectors of listed type B vent material which shall be assembled according to the manufacturer’s instructions. Joints between sections of single wall connector piping shall be fastened by screws or other approved means.
13 - When the vent connector used for Category I
appliances must be located in or pass through a crawlspace, attic or other areas which may be cold, that portion of the vent connector shall be constructed of listed double-wall type B vent material or material having equivalent insulation qualities.
Page 17
14 - All venting pipe passing through oors, walls, and
ceilings must be installed with the listed clearance
to combustible materials and be re stopped
according to local codes. In absence of local codes, refer to NFGC (Z223.1).
15 - No portion of the venting system can extend into,
or pass through any circulation air duct or plenum.
16 - Vent connectors serving Category I appliances shall
not be connected to any portion of mechanical draft systems operating under positive pressure such as Category III or IV venting systems
17 - If vent connectors are combined prior to entering the
common vent, the maximum common vent capacity listed in the common venting tables must be reduced by 10%, the equivalent of one 90° elbow (0.90 x maximum common vent capacity).
18 - The common vent diameter must always be at least
as large as the largest vent connector diameter.
19 - In no case, shall the vent connector be sized more
than two consecutive table size diameters over the
size of the draft hood outlet or ue collar outlet.
20 - Do not install a manual damper, barometric draft
regulator or ue restrictor between the furnace and
the chimney.
21 - When connecting this appliance to an existing
dedicated or common venting system, you must inspect the venting system’s general condition and look for signs of corrosion. The existing vent pipe size must conform to these instructions and the provided venting tables. If the existing venting system does not meet these requirements, it must be resized.
TABLE 3
Capacity of Type B Double-Wall Vents with Type B Double-Wall Connectors
Serving a Single Category I Appliance
Vent and Connector Diameter - D (inches)
Height
H
(feet)
6
8
10
15
20
30
NOTE - Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system. For all other vent configurations, the vent system is assumed to have two 90° elbows. For each additional 90° elbow or equivalent (for example two 45° elbows mum listed capacity).
Lateral
L
(feet)
0 0 78 0 152 0 251 0 375
2 13 51 18 97 27 157 32 232
4 21 49 30 94 39 153 50 227
6 25 46 36 91 47 149 59 223
0 0 84 0 165 0 276 0 415
2 12 57 16 109 25 178 28 263
5 23 53 32 103 42 171 53 255
8 28 49 39 98 51 164 64 247
0 0 88 0 175 0 295 0 447
2 12 61 17 11 8 23 194 26 289
5 23 57 32 11 3 41 187 52 280
10 30 51 41 104 54 176 67 267
0 0 94 0 191 0 327 0 502
2 11 69 15 136 20 226 22 339
5 22 65 30 130 39 219 49 330
10 29 59 40 121 51 206 64 315
15 35 53 48 11 2 61 195 76 301
0 0 97 0 202 0 349 0 540
2 10 75 14 149 18 250 20 377
5 21 71 29 143 38 242 47 367
10 28 64 38 133 50 229 62 351
15 34 58 46 124 59 217 73 337
20 48 52 55 11 6 69 206 84 322
0 0 100 0 213 0 374 0 587
2 9 81 13 166 14 283 18 432
5 21 77 28 160 36 275 45 421
10 27 70 37 150 48 262 59 405
15 33 64 44 141 57 249 70 389
20 56 58 53 132 66 237 80 374
30 NR NR 73 113 88 214 104 346
3 Inch 4 Inch 5 Inch 6 Inch
Appliance Input Rating in Thousands of Btu Per Hour
MIN MAX MIN MAX MIN MAX MIN MAX
Page 18
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