INSTALLATION
INSTRUCTIONS
SLP98DFV
E 2011 Lennox Industries Inc.
Dallas, Texas, USA
®
DAVE LENNOX SIGNATURE
COLLECTION GAS FURNACE
DOWNFLOW AIR DISCHARGE
506611−01
02/2011
Supersedes 10/2010
Litho U.S.A.
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, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
NOTICE
A thermostat is not included and must be ordered
separately.
DOWNFLOW
D The Lennox icomfort Toucht thermostat must be
used in communicating applications.
AIR FLOW
D In non−communicating applications, the Lennox
®
ComfortSense 7000 thermostat may be used, as
well as other non−communicating thermostats.
WARNING
In all cases, setup is critical to ensure proper sys-
tem operation.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
Field wiring for both communicating and non−com-
municating applications is illustrated in diagrams,
Table of Contents
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Parts Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SLP98DFV Gas Furnace . . . . . . . . . . . . . . . . . . . . . . . . . 4
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Use of Furnace as a Construction Heater . . . . . . . . . . . 5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Setting Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Integrated Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Blower Motor Performance . . . . . . . . . . . . . . . . . . . . . . . 40
Unit Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Gas Pressure Measurement . . . . . . . . . . . . . . . . . . . . . 46
High Altitude Information . . . . . . . . . . . . . . . . . . . . . . . . 46
Proper Combustions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Other Unit Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Heating Sequence of Operation . . . . . . . . . . . . . . . . . . 48
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Planned Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Integrated Control Diagnostic Codes . . . . . . . . . . . . . . 53
Configuring Unit Size Codes . . . . . . . . . . . . . . . . . . . . . 56
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Repair Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
9
Pipe and Fittings Specifications . . . . . . . . . . . . . . . . . . . 10
Joint Cementing Procedure . . . . . . . . . . . . . . . . . . . . . . 11
Venting Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Vent Piping Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
506611−01
02/11
Page 1
*P506611-01*
*2P0211*
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Parts Arrangement
CONTROL BOX
(includes variable capacity
integrated control,
transformer, circuit breaker
and door switch)
BLOWER ASSEMBLY
(Variable Speed Blower
Motor Is Hidden)
BAG ASSEMBLY
BLOWER
ACCESS
PANEL
ACCESS PANEL
COMBUSTION AIR INDUCER
PRIMARY LIMIT
GAS VALVE
BURNER BOX ASSEMBLY
FIGURE 1
Page 3
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SLP98DFV Gas Furnace
Safety Information
The SLP98DFV category IV gas furnace is equipped with
a variable−capacity, variable−speed integrated control.
This control ensures compatibility with the Lennox icom-
fort Toucht thermostat and Harmony IIIt zone control
system, as well as a thermostat which provides humidity
control.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
The furnace is equipped for installation in natural gas ap-
plications only. A changeover kit may be ordered for LP
applications.
CAUTION
The SLP98DFV must be installed only as a Direct Vent
gas central furnace.
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
NOTE − In Direct Vent installations, combustion air is taken
from outdoors and flue gases are discharged outdoors. See
Use only the type of gas approved for use with this furnace.
Refer to unit nameplate.
Building Codes
DIRECT VENT INSTALLATION
EXHAUST OUTLET
In the USA, installation of gas furnaces must conform with lo-
cal building codes. In the absence of local codes, units must
be installed according to the current National Fuel Gas Code
(ANSI-Z223.1/NFPA 54). The National Fuel Gas Code is
available from the following address:
COMBUSTION
AIR INTAKE
OUTSIDE OF
HOUSE
American National Standards Institute, Inc.
11 West 42nd Street
New York, NY 10036
Installation Locations and Clearances
In Canada, installation must conform with current National
Standard of Canada CSA-B149 Natural Gas and Propane
Installation Codes, local plumbing or waste water codes
and other applicable local codes.
SLP98DFV
This furnace is designed for installation clearances to com-
bustible material as listed on the unit nameplate and in the
take precedence over fire protection clearances.
FIGURE 2
Shipping and Packing List
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
floor. The furnace must be located or protected to avoid
physical damage by vehicles. When a furnace is installed
in apublic garage, hangar, or other building that has a haz-
ardous atmosphere, the furnace must be installed accord-
ing to recommended good practice requirements and cur-
rent National Fuel Gas Code or CSA B149 standard.
Package 1 of 1 contains
1 − Assembled SLP98DFV unit
1 − Bag assembly containing the following:
3 −Wire nuts
1 −Snap bushing
1 −Snap plug
1 − Wire tie
1 −Condensate trap
NOTE − Furnace must be adjusted to obtain a temperature
rise (100% percent capacity) within the range(s) specified on
the unit nameplate. Failure to do so may cause erratic limit
operation and may also result in premature heat exchanger
failure.
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
The following items may also be ordered separately:
1 −Thermostat
1 −Natural to LP gas conversion kit
1 −High altitude kit
This SLP98DFV furnace must be installed so that its elec-
trical components are protected from water.
Page 4
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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.
With a parallel flow arrangement, a damper (or other means
to control the flow of air) must adequately prevent chilled air
ly operated, it must be equipped to prevent operation of ei-
ther the heating or the cooling unit, unless it is in the full
HEAT or COOL setting.
CAUTION
Do not set thermostat below 60°F (16°C) in heating
mode. Setting thermostat below 60°F (16°C) reduces
the number of heating cycles. Damage to the unit
may occur that is not covered by the warranty.
The SLP98DFV furnace may be installed in alcoves, clos-
ets, attics, basements, garages, and utility rooms.
This furnace is not designed for installation in mobile
homes, recreational vehicles, or outdoors.
SLP98DFV INSTALLED PARALLEL
WITH COOLING COIL
Never use an open flame to test for gas leaks. Check all
connections using a commercially available soap solution
made specifically for leak detection.
Use of Furnace as Construction Heater
Lennox does not recommend the use of SLP98DFV units
as a construction heater during any phase of construction.
Very low return air temperatures, harmful vapors and op-
eration of the unit with clogged or misplaced filters will dam-
age the unit.
AIR HANDLER
GAS UNIT
Dampers
(open during cooling
operation only)
SLP98DFV units may be used for heating of buildings or
structures under construction, if the following conditions
are met:
Dampers
(open during heating
operation only)
D The vent system must be permanently installed per
these installation instructions.
D A room thermostat must control the furnace. The use of
fixed jumpers that will provide continuous heating is not
allowed.
D The return air duct must be provided and sealed to the
furnace.
FIGURE 3
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 ad-
dress:
D Return air temperature range between 60°F (16°C) and
80°F (27°C) must be maintained.
D Air filters must be installed in the system and must be
maintained during construction.
D Air filters must be replaced upon construction comple-
tion.
National Fire Protection Association
1 Battery March Park
D The input rate and temperature rise must be set per the
furnace rating plate.
Quincy, MA 02269
D One hundred percent (100%) outdoor air must be pro-
vided for combustion air requirements during construc-
tion. Temporary ducting may supply outdoor air to the
furnace. Do not connect duct directly to the furnace.
NOTE − This furnace is designed for a minimum continu-
ous return air temperature of 60°F (16°C) or an intermit-
tent operation down to 55°F (13°C) dry bulb for cases
where a night setback thermostat is used. Return air tem-
perature must not exceed 85°F (29°C) dry bulb.
D The furnace heat exchanger, components, duct system,
air filters and evaporator coils must be thoroughly
cleaned following final construction clean−up.
In Canada, all electrical wiring and grounding for the unit
must be installed according to the current regulations of the
Canadian Electrical Code Part I (CSA Standard C22.1)
and/or local codes.
D All furnace operating conditions (including ignition, in-
put rate, temperature rise and venting) must be verified
according to these installation instructions.
Page 5
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• When the furnace is installed in an unconditioned
space, consider provisions required to prevent freezing
of condensate drain system.
General
Installation − Setting Equipment
WARNING
Product contains fiberglass wool.
WARNING
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool. Breathing this may cause lung
cancer. (Fiberglass wool is known to the State of Cal-
ifornia to cause cancer.)
Do not install the furnace on its front, back or in the
horizontal position. See figure 5. Do not connect the
return air ducts to the back of the furnace. Doing so
will adversely affect the operation of the safety con-
trol devices, which could result in personal injury or
death.
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.
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,
condensate trap and drain connections, and installation
and service clearances [24 inches (610 mm) at unit
front]. The unit must be level from side to side. Unit may
be positioned from level to 1/2" toward the front to aid in
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
CAUTION
SLP98DFV unit should not be installed in areas nor-
mally subject to freezing temperatures.
SETTING EQUIPMENT
AIR FLOW
AIR FLOW
AIR FLOW
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 fol-
lowing general recommendations must be considered
when installing a SLP98DFV furnace:
1/2"
max.
SIDE VIEW
FRONT VIEW
SIDE VIEW
• Place the furnace as close to the center of the air dis-
tribution system as possible. The furnace should also be
located close to the chimney or vent termination point.
Unit must be level side−to−side. Unit may be positioned
from level to 1/2" toward the front to aid in draining.
• When the furnace is installed in an attic or other insu-
lated space, keep insulation away from the furnace.
FIGURE 4
Horizontal
Front
Back
NOTE − Do not install the furnace on its front, back or in the horizontal position.
FIGURE 5
Page 6
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NOTE − The 1/2 hp blower motor used in some SLP98DFV
unit is equipped with three flexible legs and one rigid leg.
The rigid leg is equipped with a shipping bolt and a flat white
plastic washer (rather than the rubber mounting grommet
used with a flexible mounting leg). The bolt and washer
must be removed before the furnace is placed into op-
eration. After the bolt and washer have been removed, the
rigid leg will not touch the blower housing.
The unit may be installed three ways in downflow applica-
tions: on non−combustible flooring, on combustible flooring
using a base, or on a reverse−flow cooling coil cabinet. Do
not drag the unit across the floor in the downflow posi-
tion. Floor and flange damage will result.
tions.
Downflow Application Installation Clearances
Top
SLP98DF070V36B and
SL98DF090V036C WITH 1/2 HP
BLOWER MOTOR
Left Side
Right Side
RIGID LEG
remove shipping bolt and washer
Bottom
FIGURE 6
Top
*Front
Back
Sides
Vent
0
0
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or al-
0
0†
0
WARNING
Blower access panel must be securely in place when
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into
living space resulting in personal injury or death.
Floor
NC‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
†Allow proper clearances to accommodate condensate trap and
vent pipe installation.
‡The furnace may be installed on a combustible wood floor if an op-
tional base is installed between the furnace and the combustible
floor.
WARNING
Improper installation of the furnace can result in per-
sonal injury or death. Combustion and flue products
must never be allowed to enter the return air system
or air in the living space. Use sheet metal screws and
joint tape to seal return air system to furnace.
In platform installations with furnace return, the fur-
nace should be sealed airtight to the return air ple-
num. 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. Al-
low absolutely no sagging, cracks, gaps, etc.
For no reason should return and supply air duct sys-
tems ever be connected to or from other heating de-
vices such as a fireplace or stove, etc. Fire, explo-
sion, carbon monoxide poisoning, personal injury
and/or property damage could result.
FIGURE 7
1 − Cut floor opening keeping in mind clearances listed on
unit rating plate. Also keep in mind gas supply connec-
tions, electrical supply, flue and air intake connections
and sufficient installation and servicing clearances.
See table 1 for correct floor opening size.
2 − Flange warm air plenum and lower the plenum into the
opening.
3 − Set the unit over the plenum and seal the plenum to
the unit.
4 − Ensure that the seal is adequate.
Page 7
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NON−COMBUSTIBLE FLOOR OPENING SIZE
SLP98DF UNIT
Front to Rear
Side to Side
Cabinet Width
in.
mm
502
502
in.
mm
422
511
SUPPLY AIR
PLENUM
B Cabinet (17.5")
C Cabinet (21")
19 − 3/4
19 − 3/4
16 − 5/8
20−1/8
PROPERLY
SIZED FLOOR
OPENING
COMBUSTIBLE
FLOORING BASE
NOTE − Floor opening dimensions listed are 1/4 inch (6 mm) larger than
the unit opening. See dimension drawing on page 2.
SLP98DF UNIT
FIGURE 9
PROPERLY
SIZED FLOOR
OPENING
SUPPLY AIR
PLENUM
2 − After opening is cut, set combustible flooring base into
opening.
3 − Check fiberglass strips on combustible flooring base
to make sure they are properly glued and positioned.
FIGURE 8
Installation on Combustible Flooring (Figure 9)
1 − When unit is installed on a combustible floor, a down-
flow combustible flooring base must be installed be-
tween the furnace and the floor. The base must be or-
dered separately. See table 2 for opening size to cut in
floor.
4 − Lower supply air plenum into combustible flooring
base until plenum flanges seal against fiberglass
strips.
NOTE − Be careful not to damage fiberglass strips.
Check for a tight seal.
5 − Set the furnace over the plenum.
CAUTION
The furnace and combustible flooring base shall not
be installed directly on carpeting, tile, or other com-
bustible material other than wood flooring.
6 − Ensure that the seal between the furnace and plenum
is adequate.
NOTE − Downflow combustible flooring base is not used.
COMBUSTIBLE FLOORING BASE OPENING SIZE
1 − Refer to reverse−flow coil installation instructions for
correctly sized opening in floor and installation of cabi-
net.
Front to Rear
Side to Side
Cabinet
Width
Catalog
Number
in.
22
mm
559
in.
mm
476
2 − When cooling cabinet is in place, set and secure the
furnace according to the instructions that are provided
with the cooling coil. Secure the furnace to the cabinet.
B Cabinet
(17.5")
11M60
11M61
18 − 3/4
C Cabinet
(21")
22
559
22 − 3/4
578
3 − Seal the cabinet and check for air leaks.
Page 8
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PLENUM
(Field Provided)
SEALING STRIP
(Field Provided)
SLP98DF UNIT
CABINET
SIDE PANEL
SECURE FROM
INSIDE CABINET
COOLING COIL
PLENUM
Side View
PROPERLY
SIZED FLOOR
OPENING
FIGURE 12
Filters
This unit is not equipped with a filter or rack. A field−pro-
vided filter is required for the unit to operate properly. Table
3 lists recommended filter size.
A filter must be in place whenever the unit is operating.
TABLE 3
FIGURE 10
Furnace
Cabinet Width
Filter Size
B Cabinet (17−1/2")
16 X 25 X 1 (1)
C Cabinet (21−1/2")
Return Air Opening −− Downflow Units
Duct System
Return air may be brought in only through the top opening
of a furnace installed in the downflow position. The follow-
ing steps should be taken when installing plenum:
Use industry-approved standards 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.
1 − Bottom edge of plenum should be flanged with a
NOTE − Operation of this furnace in heating mode (indoor
blower operating at selected heating speed) with an exter-
nal static pressure which exceeds 0.8 inches w.c. may re-
sult in erratic limit operation.
2 − Sealing strips should be used to ensure an airtight seal
between the cabinet and the plenum.
Return Air Plenum
3 − In all cases, plenum should be secured to top of fur-
nace using sheet metal screws.
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 fireplace) is installed. When return air is drawn
from aroom, anegative pressure is created in the room. If
a gas appliance is operating in a room with negative pres-
sure, the flue products can be pulled back down the vent
pipe and into the room. This reverse flow of the flue gas
may result in incomplete combustion and the formation
of carbon monoxide gas. This toxic gas might then be dis-
tributed throughout the house by the furnace duct sys-
tem.
4 − Make certain that an adequate seal is made.
PLENUM
SECURE FROM
(Field Provided)
OUTSIDE CABINET
CABINET
SEALING STRIP
SIDE PANEL
(Field Provided)
Use fiberglass sealing strips, caulking, or equivalent seal-
ing method between the plenum and the furnace cabinet to
ensure a tight seal. If a filter is installed, size the return air
duct to fit the filter frame.
Side View
FIGURE 11
Page 9
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Pipe & Fittings Specifications
CAUTION
All pipe, fittings, primer and solvent cement must conform
with American National Standard Institute and the Ameri-
can Society for Testing and Materials (ANSI/ASTM) stan-
dards. The solvent shall be free−flowing and contain no
lumps, undissolved particles or any foreign matter that ad-
versely affects the joint strength or chemical resistance of
the cement. The cement shall show no gelation, stratifica-
tion, or separation that cannot be removed by stirring. Re-
Solvent cements for plastic pipe are flammable liq-
uids and should be kept away from all sources of
ignition. Do not use excessive amounts of solvent
cement when making joints. Good ventilation should
be maintained to reduce fire hazard and to minimize
breathing of solvent vapors. Avoid contact of cement
with skin and eyes.
TABLE 4
PIPING AND FITTINGS SPECIFICATIONS
IMPORTANT
SLP98DFV exhaust and intake connections are
made of PVC. Use PVC primer and solvent cement
when using PVC vent pipe. When using ABS vent
pipe, use transitional solvent cement to make con-
nections to the PVC fittings in the unit.
Schedule 40 PVC (Pipe)
D1785
F891
Schedule 40 PVC (Cellular Core Pipe)
Schedule 40 PVC (Fittings)
D2466
F441
Schedule 40 CPVC (Pipe)
Schedule 40 CPVC (Fittings)
SDR−21 PVC or SDR−26 PVC (Pipe)
SDR−21 CPVC or SDR−26 CPVC (Pipe)
Schedule 40 ABS Cellular Core DWV (Pipe)
Schedule 40 ABS (Pipe)
F438
D2241
F442
Use PVC primer and solvent cement or ABS solvent cement
nate, use all purpose cement, to bond ABS, PVC, or CPVC
pipe when using fittings and pipe made of the same materi-
als. Use transition solvent cement when bonding ABS to ei-
ther PVC or CPVC.
F628
D1527
D2468
Schedule 40 ABS (Fittings)
ABS−DWV (Drain Waste & Vent)
(Pipe & Fittings)
D2661
D2665
Low temperature solvent cement is recommended. Metal or
plastic strapping may be used for vent pipe hangers. Uni-
formly apply a liberal coat of PVC primer for PVC
PVC−DWV (Drain Waste & Vent)
Pipe & Fittings)
ASTM
SPECIFICATION
PRIMER & SOLVENT CEMENT
Canadian Applications Only − Pipe, fittings, primer
and solvent cement used to vent (exhaust) this ap-
pliance must be certified to ULC S636 and supplied by a
single manufacturer as part of an approved vent (ex-
haust) system. In addition, the first three feet of vent
pipe from the furnace flue collar must be accessible for
inspection.
PVC & CPVC Primer
PVC Solvent Cement
CPVC Solvent Cement
ABS Solvent Cement
F656
D2564
F493
D2235
PVC/CPVC/ABS All Purpose Cement For
Fittings & Pipe of the same material
D2564, D2235, F493
D3138
ABS to PVC or CPVC Transition Solvent
Cement
CANADIAN PIPE, FITTINGS &
SOLVENT CEMENT
MARKING
PVC & CPVC Pipe and Fittings
PVC & CPVC Solvent Cement
ULCS636
ABS to PVC or CPVC Transition Cement
Page 10
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TABLE 5
OUTDOOR TERMINATION KITS USAGE
STANDARD
CONCENTRIC
Outdoor
Exhaust
Accelerator
(Dia. X
Outdoor
Flush-
Mount
Kit
1−1/2"
2"
Concentric Concentric Concentric
3"
Exhaust
Accelerator
(Dia. X
2" Wall Plate 3" Wall Plate
Kit
2" Wall
Ring Kit
VENT
PIPE
DIA.
Kit
SLP98DF
UNIT
Kit
Kit
Kit
Length)
Length)
(in.)
71M80 69M29
or or
†44W92†† †44W92††
22G44
or 30G28†
44J40
or 81J20†
60L46
or 44W93†
1−1/2" X 12"
2" X 12"
15F74
51W11**
2
2−1/2
3
YES
YES
YES
YES
YES
YES
YES*
YES*
YES*
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
070
090
110
2
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
2−1/2
3
2
2−1/2
3
*Requires field−provided and installed 1−1/2" exhaust accelerator.
** Kit 51W11 includes h a 1−1/2" accelerator which must be used for all SLP98DFV−070 and −090 installations.
† Termination kits 44W92, 44W93, 30G28 and 81J20 approved for use in Canadian installations.
†† The 44W92 concentric kit includes a 1−1/2" accelerator which must be installed on the exhaust outlet when this kit is used with the SL98DF070V36B furnaces.
5 − Uniformly apply a liberal coat of PVC primer for PVC or
use a clean dry cloth for ABS to clean inside socket
Joint Cementing Procedure
surface of fitting and male end of pipe to depth of fitting
socket.
All cementing of joints should be done according to the
specifications outlined in ASTM D 2855.
6 − Promptly apply solvent cement to end of pipe and in-
side socket surface of fitting. Cement should be ap-
plied lightly but uniformly to inside of socket. Take
care to keep excess cement out of socket. Apply sec-
ond coat to end of pipe.
NOTE − A sheet metal screw may be used to secure
the intake pipe to the connector, if desired. Use a drill
or self tapping screw to make a pilot hole.
NOTE − Time is critical at this stage. Do not allow prim-
er to dry before applying cement.
DANGER
DANGER OF EXPLOSION!
7 − Immediately after applying last coat of cement to pipe,
and while both inside socket surface and end of pipe
are wet with cement, forcefully insert end of pipe into
socket until it bottoms out. Turn PVC pipe 1/4 turn dur-
ing assembly (but not after pipe is fully inserted) to dis-
tribute cement evenly. DO NOT turn ABS or cellular
core pipe.
Fumes from PVC glue may ignite during system
check. Allow fumes to dissipate for at least 5 minutes
before placing unit into operation.
1 − Measure and cut vent pipe to desired length.
2 − Debur and chamfer end of pipe, removing any ridges
or rough edges. If end is not chamfered, edge of pipe
may remove cement from fitting socket and result in a
leaking joint.
NOTE − Assembly should be completed within 20 sec-
onds after last application of cement. Hammer blows
should not be used when inserting pipe.
8 − After assembly, wipe excess cement from pipe at end
of fitting socket. A properly made joint will show a
bead around its entire perimeter. Any gaps may indi-
cate a defective assembly due to insufficient solvent.
3 − Clean and dry surfaces to be joined.
NOTE − Check the inside of vent pipe thoroughly for
any obstruction that may alter furnace operation.
4 − Test fit joint and mark depth of fitting on outside of pipe.
9 − Handle joints carefully until completely set.
Page 11
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1 − In areas where piping penetrates joists or interior
walls, hole must be large enough to allow clearance on
all sides of pipe through center of hole using a hanger.
Venting Practices
Piping Suspension Guidelines
2 − When furnace is installed in a residence where unit is
shut down for an extended period of time, such as a
vacation home, make provisions for draining conden-
sate collection trap and lines.
SCHEDULE 40 PVC −−
Support every 5 feet.
all other pipe* −−
Support every 3 feet.
Route piping to outside of structure. Continue with installa-
tion following instructions given in piping termination sec-
tion.
* See table 4 for allowable pipe.
NOTE − Isolate piping at the point where it exits the outside wall or
roof in order to prevent transmission of vibration to the structure.
CAUTION
Do not discharge exhaust into an existing stack or
stack that also serves another gas appliance. If verti-
cal discharge through an existing unused stack is re-
quired, insert PVC pipe inside the stack until the end
is even with the top or outlet end of the metal stack.
Wall Thickness Guidelines
24" maximum
3/4" minimum
Wall
inside
outside
CAUTION
The exhaust vent pipe operates under positive pres-
sure and must be completely sealed to prevent leak-
age of combustion products into the living space.
Vent Piping Guidelines
FIGURE 13
The SLP98DFV is installed only as a Direct Vent gas
central furnace.
REPLACING FURNACE THAT WAS PART OF A
COMMON VENT SYSTEM
NOTE − In Direct Vent installations, combustion air is taken
from outdoors and flue gases are discharged outdoors.
CHIMNEY
OR GAS
VENT
(Check sizing
for water
heater only)
Intake and exhaust pipe sizing −− Size pipe according to
mitted.
Regardless of the diameter of pipe used, the standard roof
and wall terminations described in section Exhaust Piping
Terminations should be used. Exhaust vent termination
pipe is sized to optimize the velocity of the exhaust gas as
WATER
HEATER
FURNACE
(Replaced
by SLP98)
OPENINGS
(To Adjacent
Room)
In some applications which permit the use of several differ-
ent sizes of vent pipe, a combination vent pipe may be
used. Contact Lennox’ Application Department for assis-
tance in sizing vent pipe in these applications.
TABLE 6
MINIMUM VENT PIPE LENGTHS
If an SLP98 furnace replaces a furnace which was com-
monly vented with another gas appliance, the size of the
existing vent pipe for that gas appliance must be checked.
Without the heat of the original furnace flue products, the
existing vent pipe is probably oversized for the single water
heater or other appliance. The vent should be checked for
proper draw with the remaining appliance.
MIN. EQUIV.
VENT LENGTH
SLP98DF
MODEL
EXAMPLE
5 ft. plus 2 elbows of 2", 2−1/2"
or 3" diameter pipe
070, 090, 110
15 ft.*
*Any approved termination may be added to the minimum equivalent length
listed.
NOTE − It is acceptable to use any pipe size which fits within
FIGURE 14
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NOTE − The exhaust collar on all models is sized to ac-
commodate 2" Schedule 40 vent pipe. Contact the Ap-
plication Department for more information concerning
sizing of vent systems which include multiple pipe sizes.
Furnace
Capacity?
070, 090, 110
btuh
1
NOTE − All horizontal runs of exhaust pipe must slope back
toward unit. A minimum of 1/4" (6mm) drop for each 12"
(305mm) of horizontal run is mandatory for drainage.
NOTE − Exhaust pipe MUST be glued to furnace exhaust
Standard or
Concentric?
See table 5
fittings.
Which termination?
2
NOTE − Exhaust piping should be checked carefully to
make sure there are no sags or low spots.
Use the following steps to correctly size vent pipe diameter.
Which needs
most elbows?
Intake or
exhaust?
IMPORTANT
3
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze−ups
and may block the terminations.
How many?
4
5
Desired pipe size?
2", 2−1/2", 3"
6
7
What is the altitude?
Use table 7 to find
max intake or
exhaust pipe length.
FIGURE 15
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TABLE 7
Maximum Allowable Intake or Exhaust Vent Length in Feet
*Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
Standard Termination at Elevation 0 − 4500’
2" Pipe
Model
090
69
2−1/2" Pipe
3" Pipe
Model
090
Number Of
90° Elbows
Used
Model
090
93
070
91
86
81
76
71
66
61
56
51
46
110
14
9
070
140
135
130
125
120
115
110
105
100
95
110
43
38
33
28
23
18
13
070
162
157
152
147
142
137
132
127
122
117
110
118
113
108
103
98
1
2
143
64
88
138
3
59
83
133
4
54
78
128
5
49
73
123
6
44
68
118
93
n/a
7
39
63
113
88
8
34
58
108
83
9
29
53
103
78
n/a
10
24
48
98
73
Standard Termination Elevation 4501’ − 7500’
2" Pipe
Model
090
69
2−1/2" Pipe
Model
3" Pipe
Model
090
Number Of
90° Elbows
Used
070
66
61
56
51
46
41
36
31
26
21
110
14
9
070
115
110
105
100
95
090
93
88
83
78
73
68
63
58
53
48
110
43
38
33
28
23
18
13
070
137
132
127
122
117
112
107
102
97
110
118
113
108
103
98
1
2
143
64
138
3
59
133
4
54
128
5
49
123
6
44
90
118
93
n/a
7
39
85
113
88
8
34
80
108
83
9
29
75
103
78
n/a
10
24
70
92
98
73
Standard Terminatiuon at Elevation 7501’ − 10,000’’
2" Pipe
Model
090
44
2−1/2" Pipe
Model
3" Pipe
Model
090
118
113
108
103
98
Number Of
90° Elbows
Used
070
41
36
31
26
21
16
11
110
070
90
85
80
75
70
65
60
55
50
45
090
68
63
58
53
48
43
38
33
28
23
110
070
112
107
102
97
110
93
88
83
78
73
68
63
58
53
48
1
2
39
3
34
4
29
5
24
92
n/a
n/a
6
19
87
93
7
14
82
88
8
77
83
9
72
78
n/a
n/a
10
67
73
NOTE − Table 7 continued on next page with concentric terminations.
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TABLE 7
Maximum Allowable Intake or Exhaust Vent Length in Feet
*Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
Concentric Termination at Elevation 0 − 4500’
2" Pipe
Model
090
67
2−1/2" Pipe
3" Pipe
Model
090
139
134
129
124
119
Number Of
90° Elbows
Used
Model
090
89
070
83
78
73
68
63
58
53
48
43
38
110
12
7
070
130
125
120
115
110
105
100
95
110
39
34
29
24
19
14
070
146
141
136
131
126
121
116
111
106
101
110
114
109
104
99
1
2
62
84
3
57
79
4
52
74
5
47
69
94
6
42
64
114
89
n/a
7
37
59
109
104
99
84
8
32
54
79
n/a
9
27
90
49
74
10
22
85
44
94
69
Concentric Termination Elevation 4501’ − 7500’
2" Pipe
Model
090
67
2−1/2" Pipe
Model
3" Pipe
Model
090
114
109
104
99
Number Of
90° Elbows
Used
070
58
53
48
43
38
33
28
23
18
13
110
12
7
070
105
100
95
090
89
84
79
74
69
64
59
54
49
44
110
39
34
29
24
19
14
070
121
116
111
106
101
96
110
114
109
104
99
1
2
62
3
57
4
52
90
5
47
85
94
94
6
42
80
89
89
n/a
7
37
75
91
84
84
8
32
70
86
79
79
n/a
9
27
65
81
74
74
10
22
60
76
69
69
Concentric Terminatioin at Elevation 7501’ − 10,000’’
2−1/2" Pipe
Number Of
90° Elbows
Used
2" Pipe
Model
3" Pipe
Model
Model
070
33
28
23
18
13
090
42
37
32
27
22
17
12
110
070
80
75
70
65
60
55
50
45
40
090
64
59
54
49
44
39
34
29
24
110
070
96
91
86
81
76
71
66
61
56
090
114
109
104
99
110
89
84
79
74
69
64
59
54
49
1
2
3
4
5
6
7
8
9
94
n/a
n/a
89
84
79
n/a
74
n/a
10
35
19
51
69
44
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TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION
2”
2”
2”
DO NOT transition
from smaller to larger
pipe size in horizontal
runs of exhaust pipe.
3”
TRANSITION
*2“
TRAP
Use only the factory−supplied
trap. Trap can be installed on
Exhaust
either side of cabinet within 5 ft.
Air Intake
of the furnace.
TOP VIEW
* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
NOTE − Exhaust pipe and intake pipe must be the same diameter.
FIGURE 16
TYPICAL AIR INTAKE PIPE CONNECTIONS
2”
2”
2”
3”
TRANSITION
TRANSITION
*2”
*2”
*2”
3”
TRAP
Use only the factory−supplied
trap. Trap can be installed on
either side of cabinet within 5 ft.
of the furnace.
Exhaust
Air Intake
TOP VIEW
* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
NOTE − Intake pipe and exhaust pipe must be the same diameter.
FIGURE 17
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VENT TERMINATION CLEARANCES
FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA
INSIDE CORNER
DETAIL
G
H
A
D
E
B
L
B
Fixed
Closed
B
B
I
C
Operable
Fixed
Closed
M
F
Operable
K
J
A
B
AREA WHERE TERMINAL
IS NOT PERMITTED
AIR SUPPLY INLET
VENT TERMINAL
1
2
US Installations
Canadian Installations
A =
Clearance above grade, veranda,
porch, deck or balcony
12 inches (305mm) or 12 in. 305mm)
above average snow accumulation.
12 inches (305mm) or 12 in. 305mm)
above average snow accumulation.
B =
Clearance to window or
door that may be opened
6 inches (152mm) for appliances <10,000 6 inches (152mm) for appliances <10,000
Btuh (3kw), 9 inches (mm) for appliances
> 10,000 Btuh (3kw) and <50,000 Btuh
(15 kw), 12 inches (305mm) for ap-
pliances > 50,000 Btuh (15kw)
Btuh (3kw), 12 inches (305mm) for
appliances > 10,000 Btuh (3kw) and
<100,000 Btuh (30kw), 36 inches (.9m)
for appliances > 100,000 Btuh (30kw)
* 12"
C =
D =
Clearance to permanently
closed window
* 12"
Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet (mm)
from the center line of the terminal
* Equal to or greater than soffit depth
* Equal to or greater than soffit depth
* Equal to or greater than soffit depth
* No minimum to outside corner
* Equal to or greater than soffit depth
* No minimum to outside corner
E =
F =
G =
Clearance to unventilated soffit
Clearance to outside corner
Clearance to inside corner
*
*
H = Clearance to each side of center line ex-
tended above meter / regulator assembly
3 feet (.9m) within a height 15 feet (4.5m) 3 feet (.9m) within a height 15 feet (4.5m)
above the meter / regulator assembly
above the meter / regulator assembly
I =
Clearance to service regulator
vent outlet
3 feet (.9m)
* 3 feet (.9m)
J =
Clearance to non−mechanical air
supply inlet to building or the com-
bustion air inlet to any other ap-
pliance
6 inches (152mm) for appliances <10,000 6 inches (152mm) for appliances <10,000
Btuh (3kw), 9 inches (mm) for appliances
> 10,000 Btuh (3kw) and <50,000 Btuh
(15 kw), 12 inches (305mm) for ap-
pliances > 50,000 Btuh (15kw)
Btuh (3kw), 12 inches (305mm) for
appliances > 10,000 Btuh (3kw) and
<100,000 Btuh (30kw), 36 inches (.9m)
for appliances > 100,000 Btuh (30kw)
K =
L =
Clearance to mechanical air sup-
ply inlet
3 feet (.9m) above if within 10 feet
(3m) horizontally
6 feet (1.8m)
Clearance above paved sidewalk or
paved driveway located on public property
7 feet (2.1m)ꢀ
* 7 feet (2.1m)
M =
Clearance under veranda, porch,
deck or balcony
*12 inches (305mm)ꢁ
12 inches (305mm)ꢁ
1
In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code
*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearance
will be in accordance with local installation codes and the requirements of the gas
supplier and these installation instructions."
2
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
ꢀ A vent shall not terminate directly above a sidewalk or paved driveway that is located
between two single family dwellings and serves both dwellings.
ꢁ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two
sides beneath the floor. Lennox recommends avoiding this location if possible.
FIGURE 18
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Details of Intake and Exhaust Piping Terminations for
Direct Vent Installations
FIELD−SUPPLIED WALL TERMINATION OR
(15F74) WALL RING TERMINATION KIT
NOTE − In Direct Vent installations, combustion air is tak-
en from outdoors and flue gases are discharged to out-
doors.
NOTE − FIELD−PROVIDED
REDUCER MAY BE
1/2" (13mm) ARMAFLEX
REQUIRED TO ADAPT
INSULATION IN
NOTE − Flue gas may be slightly acidic and may adversely
affect some building materials. If any vent termination is
used and the flue gasses may impinge on the building ma-
terial, a corrosion−resistant shield (minimum 24 inches
square) should be used to protect the wall surface. If the
optional tee is used, the protective shield is recommended.
The shield should be constructed using wood, plastic,
sheet metal or other suitable material. All seams, joints,
cracks, etc. in the affected area should be sealed using an
LARGER VENT PIPE SIZE
UNCONDITIONED SPACE
TO TERMINATION.
SIZE TERMINATION
PER TABLE 9
D
B
STRAIGHT
APPPLICATION
C
Intake and exhaust pipes may be routed either horizontally
through an outside wall or vertically through the roof. In attic
or closet installations, vertical termination through the roof
tions.
A
1/2" (13mm) ARMAFLEX INSULATION
IN UNCONDITIONED SPACE
1 − Exhaust and intake exits must be in same pressure
zone. Do not exit one through the roof and one on the
side. Also, do not exit the intake on one side and the
exhaust on another side of the house or structure.
2 − Intake and exhaust pipes should be placed as close
together as possible at termination end (refer to il-
lustrations). Maximum separation is 3" (76mm) on roof
terminations and 6" (152mm) on side wall termina-
tions.
D
E
* WALL
SUPPORT
B
A
C
EXTENDED
APPLICATION
3 − On roof terminations, the intake piping should termi-
nate straight down using two 90° elbows (See figure
19).
4 − Exhaust piping must terminate straight out or up as
shown. A reducer may be required on the exhaust pip-
ing at the point where it exits the structure to improve
the velocity of exhaust away from the intake piping.
See table 9.
See venting table 7 for maximum venting lengths with this
arrangement.
* Use wall support every 24" (610 mm). Use two wall supports if
extension is greater than 24" (610 mm) but less than 48" (1219
mm). NOTE − One wall support must be 6" (152 mm) from top
of each pipe (intake and exhaust).
NOTE − Care must be taken to avoid recirculation of
exhaust back into intake pipe.
2" (51mm)
Vent Pipe
3" (76mm)
Vent Pipe
A−Minimum clearance
above grade or average
snow accumulation
3"(76mm) MAX.
SIZE TERMINATION
PIPE PER TABLE 9.
Inches(mm)
12" (508MM)
6" (152MM)
8" (203MM)
12" (508MM)
6" (152MM)
8" (203MM)
B−Maximum horizontal
separation between
intake and exhaust
UNCONDITIONED
ATTIC SPACE
8" (203mm) MIN
1/2" (13mm) FOAM
INSULATION IN
UNCONDITIONED
SPACE
12" (305mm) ABOVE
AVERAGE SNOW
ACCUMULATION
C−Minimum from
end of exhaust to
inlet of intake
D−Maximum exhaust
pipe length
12" (305MM)
6" (152MM)
20" (508MM)
6" (152MM)
E−Maximum wall support
distance from top of each
pipe (intake/exhaust)
3" (76mm) OR
2" (51mm) PVC
PROVIDE SUPPORT
FOR INTAKE AND
EXHAUST LINES
FIGURE 20
DIRECT VENT ROOF TERMINATION KIT
(15F75 or 44J41)
FIGURE 19
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B
B
D
D
C
3
Intake
C
1
Front View of
Intake and Exhaust
A
Exhaust
A
2
Intake
Exhaust
TABLE 8
2" (51mm)
Vent Pipe
D
3" (76mm)
Vent Pipe
1
A− Clearance above
grade or average snow
accumulation
E
12" (508MM) Min.
12" (508MM) Min.
B
B−Horizontal
separation between
intake and exhaust
6" (152MM) Min. 6" (152MM) Min.
24" (610 MM) Max 24" (610 MM) Max
12"
C−Minimum from
end of exhaust to
inlet of intake
9" (227MM) Min. 9" (227MM) Min.
C
2
12" (305MM) Min.
16" (405 MM) Max.
12" (305MM) Min.
20" (508MM) Max.
D−Exhaust pipe length
A
E−Wall support distance
from top of each pipe
(intake/exhaust)
6" (152MM) Max. 6" (152MM) Max.
NOTE − See unit installation instructions for proper exhaust pipe termination size reduction.
The exhaust termination tee should be connected to the 2" or 3" PVC flue pipe as shown in the illustration. Do
not use an accelerator in applications that include an exhaust termination tee. The accelerator is not required.
1
2
As required. Flue gas may be acidic and may adversely affect some building materials. If a side wall vent
termination is used and flue gases will impinge on the building materials, a corrosion−resistant shield (24 inches
square) should be used to protect the wall surface. If optional tee is used, the protective shield is recommende-
d. The shield should be constructed using wood, sheet metal or other suitable material. All seams, joints,
cracks, etc. in affected area, should be sealed using an appropriate sealant.
3
Exhaust pipe 45° elbow can be rotated to the side away from the combustion air inlet to direct exhaust away
from adjacent property. The exhaust must never be directed toward the combustion air inlet.
FIGURE 21
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TABLE 9
EXHAUST PIPE TERMINATION SIZE REDUCTION
FIELD−SUPPLIED WALL TERMINATION OR
(15F74) WALL RING TERMINATION KIT
With INTAKE ELBOW
SLP98DFV
MODEL
Exhaust Pipe Size
Termination Pipe Size
*070
*090
110
2", 2−1/2" or 3"
2", 2−1/2" or 3"
2", 2−1/2" or 3"
1−1/2"
2"
NOTE − FIELD−PROVIDED
REDUCER MAY BE
1/2" (13mm) ARMAFLEX
REQUIRED TO ADAPT
2"
INSULATION IN UN-
LARGER VENT PIPE SIZE
CONDITIONED SPACE
TO TERMINATION.
*SLP98DF −070 and −090 units with the flush−mount ter-
mination must use the 1−1/2" accelerator supplied with the
kit.
SIZE TERMINATION
PER TABLE 9
5 − On field−supplied terminations for side wall exit, ex-
haust piping may extend a maximum of 12 inches
(305mm) for 2" PVC and 20 inches (508mm) for 3"
(76mm) PVC beyond the outside wall. Intake piping
6 − On field−supplied terminations, a minimum distance
between the end of the exhaust pipe and the end of
the intake pipe without a termination elbow is 8" and a
minimum distance of 6" with a termination elbow. See
D
B
STRAIGHT
APPPLICATION
C
A
1/2" (13mm) ARMAFLEX INSULATION
IN UNCONDITIONED SPACE
7 − If intake and exhaust piping must be run up a side wall
to position above snow accumulation or other ob-
structions, piping must be supported every 24"
close−coupled wall termination kits must be extended
When exhaust and intake piping must be run up an
outside wall, the exhaust piping must be terminated
equipped with a 90° turndown elbow. Using a turn-
down elbow will add 5 feet (1.5m) to the equivalent
length of the pipe.
D
E
* WALL
SUPPORT
B
A
EXTENDED
APPLICATION
C
See venting table 7 for maximum venting lengths with this
arrangement.
8 − Based on the recommendation of the manufacturer, a
multiple−furnace installation may use a group of up to
four terminations assembled together horizontally, as
* Use wall support every 24" (610 mm). Use two wall supports if
extension is greater than 24" (610 mm) but less than 48" (1219
mm). NOTE − One wall support must be 6" (152 mm) from top of
each pipe (intake and exhaust).
2" (51mm)
Vent Pipe
3" (76mm)
Vent Pipe
1−1/2" (38mm) accelerator
provided on 71M80 &
44W92 kits for
A−Minimum clearance
above grade or average
snow accumulation
SLP98DFV−36B−070
12" (508MM)
12" (508MM)
FLASHING
(Not Furnished)
12” (305mm)
Minimum
INTAKE
B−Maximum horizontal
separation between
intake and exhaust
6" (152MM)
6" (152MM)
Above Average
Snow
Accumulation
C−Minimum from
end of exhaust to
inlet of intake
6" (152MM)
20" (508MM)
6" (152MM)
6" (152MM)
12" (305MM)
6" (152MM)
D−Maximum exhaust
pipe length
SHEET METAL STRAP
(Clamp and sheet metal strap
must be field installed to support
the weight of the termination kit.)
E−Maximum wall support
distance from top of each
pipe (intake/exhaust)
CLAMP
FIELD−PROVIDED
REDUCER MAY BE REQUIRED
TO ADAPT LARGER VENT
PIPE SIZE TO TERMINATION
FIGURE 22
DIRECT VENT CONCENTRIC ROOFTOP TERMINATION
71M80, 69M29 or 60L46 (US)
41W92 or 41W93 (Canada)
FIGURE 23
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FIELD−PROVIDED
REDUCER MAY BE RE-
QUIRED TO ADAPT
LARGER VENT PIPE
SIZE TO TERMINATION.
1−1/2" (38mm) accelerator
provided on 71M80 &
44W92 kits for
EXHAUST VENT
Front View
SIZE
SL98DF070V36B
TERMINATION
PIPE PER
INTAKE
AIR
INTAKE
AIR
OUTSIDE
WALL
EXHAUST
AIR
EXHAUST
AIR
Top View
1/2" (13mm) Foam Insulation
in Unconditioned Space
12" (305mm) Min.
above grade or
average snow
accumulation.
INTAKE
INTAKE
AIR
CLAMP
(Not Furnished)
AIR
FIELD−PROVIDED
REDUCER MAY BE
REQUIRED TO
EXHAUST VENT
INTAKE AIR
GRADE
ADAPT LARGER
VENT PIPE SIZE
TO TERMINATION
DIRECT VENT CONCENTRIC WALL TERMINATION
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
FIGURE 24
8" (206mm) MIN.
OUTSIDE WALL
DIRECT VENT WALL TERMINATION KIT
(22G44 or 44J40)
12"
EXHAUST
VENT
(305mm)
5−1/2"
(140mm)
5"
(127mm)
FIGURE 27
INTAKE
AIR
SLP98 DIRECT VENT APPLICATION
USING EX
18" MAX.
(457mm)
STRAIGHT−CUT OR
ANGLE−CUT IN DIRECTION
OF ROOF SLOPE *
Front View
EXHAUST VENT
12" (305mm) Min.
above grade or
average snow ac-
cumulation.
3" − 8"
(76mm−
203mm)
EXHAUST VENT
1/2" (13mm)
WEATHERPROOF
INSULATION
8" − 12"
(203mm − 305mm)
Inches (mm)
INTAKE
AIR
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
Minimum 12" (305MM)
above chimney top
plate or average snow
accumulation
INTAKE PIPE
INSULATION (optional)
SHEET
METAL TOP
PLATE
ALTERNATE
INTAKE PIPE
Side View
optional intake elbow
OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT
INSTALLATION OF DIRECT VENT WALL TERMINATION KIT
(22G44, 44J40, 30G28 or 81J20)
3" − 8"
(76mm−
203mm)
INSULATE
TO FORM
SEAL
EXTERIOR
PORTION OF
CHIMNEY
FIGURE 25
*SIZE TERMINATION
PIPE PER TABLE 9.
EXHAUST VENT
Front View
SIZE
TERMINATION
PIPE PER
NOTE − Do not discharge exhaust gases directly into any chimney or vent stack. If ver-
tical discharge through an existing unused chimney or stack is required, insert piping
inside chimney until the pipe open end is above top of chimney and terminate as illus-
trated. In any exterior portion of chimney, the exhaust vent must be insulated.
INTAKE
AIR
FIGURE 28
Top View
2" EXTENSION FOR
2" PVC PIPE
1" EXTENSION FOR
3" PVC PIPE
FURNACE
EXHAUST
PIPE
1/2" (13mm) Foam Insulation
in Unconditioned Space
4’’
FIELD−PROVIDED
REDUCER MAY BE
REQUIRED TO
ADAPT LARGER
VENT PIPE SIZE
TO TERMINATION.
GLUE EXHAUST
END FLUSH INTO
TERMINATION
EXHAUST VENT
INTAKE AIR
FURNACE
INTAKE
PIPE
6 (152mm) MIN.
1−1/2" ACCELERATOR
(all −070 and −090 units)
OUTSIDE WALL
DIRECT VENT WALL TERMINATION KIT
(30G28 or 81J20)
FLUSH−MOUNT SIDE WALL TERMINATION KIT 51W11
FIGURE 29
FIGURE 26
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WALL TERMINATION KITS (CLOSE−COUPLE)
EXTENDED VENT FOR GRADE CLEARANCE
2 inch (51 mm) 22G44 (US)
3 inch (76 mm) 44J40 (US)
If intake and exhaust pipe is less than 12 in. (305 mm)
above snow accumulation or other obstructions,
field−fabricated piping must be installed.
FIELD−PROVIDED
REDUCER MAY BE REQUIRED TO ADAPT
LARGER VENT PIPE SIZE TO TERMINATION
8” (203 mm) min. for 2” (51 mm) & 3” (76 mm) dia. pipe
between the end of the exhaust pipe and intake pipe.
12” (305 mm) max. for 2” (51 mm) dia. exhaust
20” (508 mm) max. for 3” (76 mm) dia. exhaust
WALL SUPPORT*
12”
(305 mm)
EXHAUST
AIR
1/2” (13 mm)
6” (152 mm)
Maximum
FOAM INSULATION
(Field−Furnished)
INTAKE
AIR
EXHAUST
AIR
INTAKE
AIR
5” (127 mm)
12” (305 mm) Minimum
8” (203 mm) Min.
12” (305 mm) Minimum
Above Grade or Average
Snow Accumulation
Above Grade or Average
5−1/2”
Snow Accumulation
(140 mm)
GRADE
GRADE
*Use wall support every 24" (610). Use two supports if
extension is greater than 24" but less than 48".
12” (305 mm) Max. for 2” (51 mm) Dia. Exhaust
20” (508 mm) Max. for 3” (76 mm) Dia. Exhaust
FIGURE 30
WALL TERMINATION KITS (CLOSE−COUPLE)
EXTENDED VENT FOR GRADE CLEARANCE
2 inch (51 mm) 30G28 (WTK Canada)
3 inch (76 mm) 81J20 (WTK Canada)
See installation instructions for additional information.
If intake and exhaust pipe is less than 12 in. (305 mm)
above snow accumulation or other obstructions,
field−fabricated piping must be installed.
FIELD−PROVIDED
REDUCER MAY BE REQUIRED TO ADAPT
LARGER VENT PIPE SIZE TO TERMINATION
WALL SUPPORT*
12” (305 mm) max. for 2” (51 mm) dia. exhaust
20” (508 mm) max. for 3” (76 mm) dia. exhaust
12”
(305 mm)
EXHAUST
AIR
1/2” (13 mm)
FOAM INSULATION
(Field Furnished)
6” (152 mm)
Maximum
INTAKE
AIR
6” (152 mm)
Minimum
EXHAUST
AIR
INTAKE
AIR
5” (127 mm)
12” (305 mm) Minimum
Above Grade or Average
Snow Accumulation
6” (152 mm)
Minimum
12” (305 mm) Minimum
Above Grade or Average
Snow Accumulation
GRADE
5−1/2”
(140 mm)
GRADE
*Use wall support every 24" (610). Use two supports if
extension is greater than 24" but less than 48".
12” (305 mm) max. for 2” (51 mm) dia. exhaust
20” (508 mm) max. for 3” (76 mm) dia. exhaust
FIGURE 31
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Condensate Piping
3 − Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in fig-
This unit is designed for either right- or left-side exit of con-
tions.
4 − If unit will be started immediately upon completion of
installation, prime trap per procedure outlined in Unit
Start−Up section.
NOTE − If necessary the condensate trap may be installed
up to 5 feet away from the furnace. Piping from furnace
must slope down a minimum of 1/4" per ft. toward trap.
Condensate line must be sloped downward away from
condensate trap to drain. If drain level is above con-
densate trap, condensate pump must be used. Con-
densate drain line should be routed within the condi-
tioned space to avoid freezing of condensate and
blockage of drain line. If this is not possible, a heat
cable kit may be used on the condensate trap and line.
Heating cable kit is available from Lennox in various
lengths; 6 ft. (1.8m) − kit no. 26K68; 24 ft. (7.3m) − kit
no. 26K69; and 50 ft. (15.2m) − kit no. 26K70.
NOTE − Vinyl tubing may be used for condensate drain.
Tubing must be 1−1/4" OD X 1" ID and should be
attached to the drain on the trap using a hose clamp.
CONDENSATE TRAP AND PLUG LOCATION
(shown with left side exit of condensation)
CAUTION
Do not use copper tubing or existing copper
condensate lines for drain line.
CONDENSATE TRAP LOCATION
(shown with right side exit of condensation)
1−1/2 in.
Field−Provided Vent
min. 1" Above
Condensate Drain
Trap Can Be Installed a
Maximum Of 5’ From Furnace
(PVC Only)
Trap
Plug
(same other right side)
(same on left side)
1" min.
FIGURE 32
*5’ max.
1 − Determine which side condensate piping will exit the
unit, location of trap, field−provided fittings and length of
PVC pipe required to reach available drain.
at the appropriate location on the side of the unit. Install
1/2 NPT male field provided fitting into cold end head-
er box. Do Not Over Tighten. Use teflon tape or ap-
propriate pipe dope.
to drain
*Piping from furnace must slope down a minimum of
1/4" per ft. toward trap.
FIGURE 33
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TRAP / DRAIN ASSEMBLY USING 1/2" PVC OR 3/4" PVC
OPTIONAL Condensate Drain Connection
Adapter 1/2 inch slip X
Adapter 1/2 inch slip X
1/2 inch mpt (Not Furnished)
Condensate Drain
Connection In Unit
1/2 inch mpt (Not Furnished)
Vent
90° Street Elbow
1 (25) Minimum
1/2 inch PVC
5 Feet
Maximum
(Not Furnished)
Above Top of Condensate Drain
Connection In Unit
90° Elbow 1/2 inch PVC
Condensate Drain
Connection In Unit
(Not Furnished)
1/2 inch PVC Pipe
(Not Furnished)
1/2 inch PVC Pipe
(Not Furnished)
OPTIONAL Drain Piping
Drain Assembly for 1/2 inch Drain Pipe
Coupling 1/2 inch slip X slip
(Not Furnished)
1/2 inch PVC Pipe
(Not Furnished)
90° Street Elbow
1/2 inch PVC
(furnished)
Drain Trap
Assembly
(Furnished)
90° Elbow
1/2 inch PVC
(Not Furnished)
To
Drain
To
Drain
Drain Assembly for 3/4 inch Drain Pipe
Drain Trap
Clean Out
90° Elbow
90° Elbow
3/4 inch PVC
(Not Furnished)
3/4 inch PVC
(Not Furnished)
To
Drain
To
Drain
Coupling 3/4 inch slip X slip
(Not Furnished)
Drain Trap Assembly with 3/4 inch Piping
Drain Trap Assembly with 1/2 inch Piping
1 inch (25mm) Minimum Above Top of
Condensate Drain Connection In Unit
1 inch (25mm) Minimum Above Top of
Condensate Drain Connection In Unit
Vent
Drain Trap Assembly
(Furnished)
Vent
7
Condensate Drain
Connection In Unit
Condensate Drain
Connection In Unit
(178)
To
Drain
To
Drain
FIGURE 34
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4 − Piping should be sloped 1/4 inch per 15 feet (6mm per
5.6m) upward toward the gas meter from the furnace.
The piping must be supported at proper intervals, ev-
ery 8 to 10 feet (2.44 to 3.05m), using suitable hangers
or straps. Install a drip leg in vertical pipe runs to serve as
a trap for sediment or condensate.
CAUTION
A separate drain line must be run to the drain from
the condensate trap to ensure proper drainage and
pressure switch operation. DO NOT connect the con-
densate trap drain into the drain line from the evapo-
rator coil.
5 − A 1/8" N.P.T. plugged tap or pressure post is located on
the gas valve to facilitate test gauge connection. See
SL98DFV with Evaporator Coil
6 − In some localities, codes may require installation of a
manual main shut-off valve and union (furnished by in-
staller) external to the unit. Union must be of the
ground joint type.
Condensate trap and
evaporator coil must drain
separately as shown.
Field−Provided Vent
IMPORTANT
Compounds used on threaded joints of gas piping
must be resistant to the actions of liquified petro-
leum gases.
MANUAL MAIN SHUT−OFF
VALVE WILL NOT HOLD
NORMAL TEST PRESSURE
FURNACE
ISOLATE
GAS VALVE
1/8" N.P.T.
PLUGGED
TAP
Drain
CAP
FIGURE 35
Gas Piping
FIGURE 36
Leak Check
CAUTION
If a flexible gas connector is required or allowed by
the authority that has jurisdiction, black iron pipe
shall be installed at the gas valve and extend outside
the furnace cabinet.
After gas piping is completed, carefully check all piping
connections (factory− and field−installed) for gas leaks. Use
a leak detecting solution or other preferred means.
The furnace must be isolated from the gas supply system
by closing its individual manual shut-off valve during any
pressure testing of the gas supply system at pressures less
than or equal to 1/2 psig (3.48 kPa, 14 inches w.c.).
WARNING
Do not exceed 600 in−lbs (50 ft.−lbs) torque when at-
taching the gas piping to the gas valve.
IMPORTANT
When testing gas lines using pressures in excess of
1/2 psig (3.48 kPa), gas valve must be disconnected
and isolated. See figure 36. Gas valves can be dam-
aged if subjected to pressures greater than 1/2 psig
(3.48 kPa).
1 − Gas piping may be routed into the unit through either
the left- or right-hand side. Supply piping enters into
the gas valve from the side of the valve as shown in
2 − When connecting gas supply, factors such as length of
run, number of fittings and furnace rating must be con-
lists recommended pipe sizes for typical applications.
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could
result in serious injury, death, or property damage.
Never use an open flame to test for gas leaks. Check
all connections using a commercially available soap
solution made specifically for leak detection. Some
soaps used for leak detection are corrosive to certain
metals. Carefully rinse piping thoroughly after leak
test has been completed.
NOTE − Use two wrenches when connecting gas pip-
ing to avoid transferring torque to the manifold.
3 − Gas piping must not run in or through air ducts, clothes
chutes, chimneys or gas vents, dumb waiters or eleva-
tor shafts. Center gas line through piping hole. Gas
Page 25
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Left Side Piping
(Standard)
AUTOMATIC
GAS VALVE
(with manual
shut−off valve)
MANUAL
MAIN SHUT−OFF
VALVE
(1/8 in. NPT
plugged tap
shown)
MANUAL
MAIN SHUT−OFF
VALVE
AUTOMATIC
GAS VALVE
(with manual
shut−off valve)
(1/8 in. NPT
plugged tap shown)
GROUND
JOINT
UNION
GROUND
JOINT
UNION
DRIP LEG
Right Side Piping
(Alternate)
FIELD
PROVIDED
AND INSTALLED
DRIP LEG
NOTE − BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET
FIGURE 37
TABLE 10
GAS PIPE CAPACITY − FT3/HR (kL/HR)
Length of Pipe−Feet(m)
Nominal
Iron Pipe Size
−Inches(mm)
Internal
Diameter
−Inches(mm)
10
(3.048)
20
(6.096)
30
(9.144)
40
50
60
70
80
90
100
(12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480)
1/2
(12.7)
.622
(17.799)
175
(4.96)
120
(3.40)
97
(2.75)
82
(2.32)
73
(2.07)
66
(1.87)
61
(1.73)
57
(1.61)
53
(1.50)
50
(1.42)
3/4
(19.05)
.824
(20.930)
360
(10.19)
250
(7.08)
200
(5.66)
170
(4.81)
151
(4.28)
138
(3.91)
125
(3.54)
118
(3.34)
110
(3.11)
103
(2.92)
1
(25.4)
1.049
(26.645)
680
(19.25)
465
(13.17)
375
(10.62)
320
(9.06)
285
(8.07)
260
(7.36)
240
(6.80)
220
(6.23)
205
(5.80)
195
(5.52)
1−1/4
(31.75)
1.380
(35.052)
1400
(39.64)
950
(26.90)
770
(21.80)
660
(18.69)
580
(16.42)
530
(15.01)
490
(13.87)
460
(13.03)
430
(12.18)
400
(11.33)
1−1/2
(38.1)
1.610
(40.894)
2100
(59.46)
460
(41.34)
1180
(33.41)
990
(28.03)
900
(25.48)
810
(22.94)
750
(21.24)
690
(19.54)
650
(18.41)
620
(17.56)
2
(50.8)
2.067
(52.502)
3950
(111.85)
2750
(77.87)
2200
(62.30)
1900
(53.80)
1680
(47.57)
1520
(43.04)
1400
(39.64)
1300
(36.81)
1220
(34.55)
1150
(32.56)
2−1/2
(63.5)
2.469
(67.713)
6300
(178.39)
4350
(123.17)
3520
(99.67)
3000
(84.95)
2650
(75.04)
2400
(67.96)
2250
(63.71)
2050
(58.05)
1950
(55.22)
1850
(52.38)
3
(76.2)
3.068
(77.927)
11000
(311.48)
7700
(218.03)
6250
(176.98)
5300
(150.07)
4750
(134.50)
4300
(121.76)
3900
(110.43)
3700
(104.77)
3450
(97.69)
3250
(92.03)
4
(101.6)
4.026
(102.260)
23000
(651.27)
15800
(447.39)
12800
(362.44)
10900
(308.64)
9700
(274.67)
8800
(249.18)
8100
(229.36)
7500
(212.37)
7200
(203.88)
6700
(189.72)
NOTE − Capacity given in cubic feet of gas per hour (kilo liters of gas per hour) and based on 0.60 specific gravity gas.
Removal of the Furnace from Common Vent
WARNING
CARBON MONOXIDE POISONING HAZARD
In the event that an existing furnace is removed from a
venting system commonly run with separate gas ap-
pliances, the venting system is likely to be too large to
properly vent the remaining attached appliances.
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon mon-
oxide poisoning or death.
The following steps shall be followed for each ap-
pliance connected to the venting system being
placed into operation, while all other appliances
connected to the venting system are not in
operation:
Conduct the following test while each appliance is operat-
ing and the other appliances (which are not operating) re-
main connected to the common venting system. If the
venting system has been installed improperly, you must
correct the system as indicated in the general venting re-
quirements section.
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1 − Seal any unused openings in the common venting sys-
tem.
INTERIOR MAKE−UP BOX
(FACTORY− INSTALLED LEFT SIDE)
2 − Inspect the venting system for proper size and horizontal
pitch. Determine that there is no blockage, restriction,
leakage, corrosion, or other deficiencies which could
cause an unsafe condition.
3 − Close all building doors and windows and all doors be-
tween the space in which the appliances remaining
connected to the common venting system are located
and other spaces of the building. Turn on clothes dry-
ers and any appliances not connected to the common
venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they will oper-
ate at maximum speed. Do not operate a summer ex-
haust fan. Close fireplace dampers.
MAKE−UP
BOX INSIDE
CABINET
Left side
4 − Follow the lighting instructions. Turn on the appliance
that is being inspected. Adjust the thermostat so that
the appliance operates continuously.
5 − After the main burner has operated for 5 minutes, test
for leaks of flue gases at the draft hood relief opening.
Use the flame of a match or candle.
FIGURE 38
EXTERIOR MAKE−UP BOX
(FIELD PROVIDED RIGHT SIDE)
6 − After determining that each appliance connected to the
common venting system is venting properly, (step 3)
return all doors, widows, exhaust fans, fireplace damp-
ers, and any other gas−burning appliances to their pre-
vious mode of operation.
MAKE−UP
BOX
OUTSIDE
CABINET
7 − If a venting problem is found during any of the preced-
ing tests, the common venting system must be modi-
fied to correct the problem.
Right Side
Resize the common venting system to the minimum
vent pipe size determined by using the appropriate
tables in Appendix G. (These are in the current stan-
dards of the National Fuel Gas Code ANSI Z223.1.
FIGURE 39
Electrical
The unit is equipped with a make−up box on the left hand
side of the cabinet. A field−provided make−up box can be
installed on the exterior of the right side of the furnace to
facilitate installation. If the make−up box is moved to the
right side, clip the wire ties that bundle the wires together
excess wire must be pulled into the blower compartment.
Secure the excess wire to the existing harness to protect it
from damage.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic com-
ponents. Take precautions during furnace installa-
tion and service to protect the furnace’s electronic
controls. Precautions will help to avoid control ex-
posure to electrostatic discharge by putting the fur-
nace, the control and the technician at the same
electrostatic potential. Neutralize electrostatic
charge by touching hand and all tools on an un-
painted unit surface, such as the gas valve or blower
deck, before performing any service procedure.
for icomfort Toucht thermostat wiring in communicating
settings for non−communicating thermostat applications.
Page 27
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1 − The power supply wiring must meet Class I restric-
tions. Protected by either a fuse or circuit breaker, se-
lect circuit protection and wire size according to unit
nameplate.
9 − One 24V ꢂH" terminal is provided on the furnace inte-
grated control terminal block. Any humidifier rated up
to 0.5 amp can be connected to this terminal with the
ground leg of the circuit being connected to either
terminal.
NOTE − Unit nameplate states maximum current draw. See
table for maximum over−current protection.
10 −Install the room thermostat according to the instruc-
thermostat connections. If the furnace is being
matched with a heat pump, refer to the instruction
packaged with the dual fuel thermostat.
TABLE 11
Maximum Over−Current
SLP98DF Model
Protection (Amps)
NOTE − The discharge air temperature sensor is intended
to be mounted downstream of the heat exchanger and air
conditioning coil. It must be placed in free airflow, where
other accessories (humidifiers, UV lights etc.) will not inter-
fere with its accuracy. Wiring distance between the furnace
and discharge air sensor should not exceed 10 ft. when
wired with 18−gauge thermostat wire.
07036B, 09036C, 09048C
09060C, 11060C
15
20
2 − Holes are on both sides of the furnace cabinet to facili-
tate wiring.
3 − Install a separate (properly sized) disconnect switch
near the furnace so that power can be turned off for
servicing.
TABLE 12
Run Length ꢀ Non Communicating
4 − Before connecting the thermostat or the power wiring,
check to make sure the wires will be long enough for
servicing at a later date. Remove the blower access
panel to check the length of the wire.
Wire Run Length
AWG #
Insulation/Core Types
Color−coded, temperature
Less than 100’ (30m)
18
º
º
rating 95 F (35 C) mini-
mum, solid core. (Class II
Rated Wiring)
More than 100’ (30m)
16
5 − Complete the wiring connections to the equipment.
Use the provided unit wiring diagram and the field wir-
18−gauge wire or larger that is suitable for Class II ra-
ting for thermostat connections.
TABLE 13
Run Length ꢀ Communicating
Wire Run Length
AWG #
Insulation/Core Types
Maximum length of wiring
for all connections on the
RSBus is limited to 1500
feet (457 meters).
Color−coded, temperature
º
º
rating 95 F (35 C) mini-
mum, solid core. (Class II
Rated Wiring)
NOTE − Do NOT make a wire connection between
the room thermostat L terminal and the L terminal
of the SLP98DFV integrated control unless this is a
communicating thermostat installation with a non−
communicating outdoor unit.
18
Thermostat Selection
The SLP98DFV is designed to operate in a variable rate ca-
pacity mode using a two−stage thermostat. The SLP98DFV
will automatically adjust firing rate based upon thermostat
cycle times.
6 − Electrically ground the unit according to local codes or,
in the absence of local codes, according to the current
National Electric Code (ANSI/NFPA No. 70) for the
USA and current Canadian Electric Code part 1 (CSA
standard C22.1) for Canada. A green ground wire is
provided in the field make−up box.
The icomfort Toucht thermostat must be used in commu-
nicating applications. Refer to the instructions provided
with the thermostat for installation, set−up and operation.
For optimal performance in non−communicating applica-
®
tions, Lennox recommends use of a ComfortSense 7000
7 − One line voltage ꢂEAC" 1/4" spade terminal is provided
on the furnace integrated control. Any electronic air
cleaner rated up to one amp can be connected to this
terminal with the neutral leg of the circuit being con-
nected to one of the provided neutral terminals. See
gized when the indoor blower is operating.
high quality electronic digital thermostat or any other with
adjustable settings for 1st stage / 2nd stage on / off differen-
tials and adjustable stage timers.
Lennox recommends the following two−stage thermostat
set−up for optimal variable rate capacity mode:
First heat stage differential set to 1/2 to 1 degree F; second
heat stage differential set to 1/2 or 1 degree F; second heat
stage upstage timer disabled, or set to maximum (1 hr mini-
mum).
8 − One line voltage ꢂHUM" 1/4" spade terminal is provided
on the furnace integrated control. Any humidifier rated
up to one amp can be connected to this terminal with
the neutral leg of the circuit being connected to one of
tion of terminal. This terminal is energized in the heat-
ing mode when the indoor blower is is operating.
Indoor Blower Speeds
NOTE − When the SLP98DFV is used with icomfort
Toucht thermostat, proper indoor blower speed selec-
tions are made by the communicating thermostat.
Page 28
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1 − When the thermostat is set to ꢂFAN ON," the indoor
blower will run continuously at a percentage of the sec-
ond−stage cooling speed when there is no cooling or
heating demand. The percentage is set using DIP
switches 6 and 7.
Generator Use − Voltage Requirements
The following requirements must be kept in mind when
specifying a generator for use with this equipment:
D The furnace requires 120 volts + 10% (Range: 108
volts to 132 volts).
2 − When the SLP98DFV is running in the heating mode,
the integrated control will automatically adjust the
blower speed to match the furnace firing rate. This
speed can be adjusted up or down by 7.5% or 15% us-
ing DIP switches 14 through 16 for the low heat speed
and 17 through 19 for the high heat speed.
D The furnace operates at 60 Hz + 5% (Range: 57 Hz to
63 Hz).
D The furnace integrated control requires both polarity
and proper ground. Both polarity and proper grounding
should be checked before attempting to operate the
furnace on either permanent or temporary power.
3 − When there is a cooling demand, the indoor blower will
run on the cooling speed designated by the positions
of DIP switches 8 through 11.
D Generator should have a wave form distortion of less
than 5% THD (total harmonic distortion).
TYPICAL SLP98DFV FIELD WIRING DIAGRAM FOR STANDARD
NON−COMMUNICATING THERMOSTAT
USE COPPER CONDUCTORS ONLY.
FIELD INSTALLED CLASS II 24V
FIELD INSTALLED LINE VOLTAGE
19
1
8
2
4
5
7
3
6
12
10
16
17
9
11
14 15
13
18
FIGURE 40
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icomfort Toucht Thermostat with SLP98DFV
and Non−Communicating Outdoor Unit
icomfort Toucht Thermostat with SLP98DFV
and icomfortt−ENABLED Outdoor Unit
icomfort Toucht Thermostat
icomfortt−Enabled SLP98DFV Indoor Furnace
Non−Communicating Outdoor Air Conditioner
icomfort Toucht Thermostat
icomfortt−Enabled SLP98DFV Indoor Furnace
icomfortt−Enabled Outdoor Air Conditioner or Heat Pump
icomfortt−
ENABLED
SLP98DFV
icomfortt−
ENABLED
SLP98DFV
FURNACE
FURNACE
OPTIONAL
DISCHARGE
AIR SENSOR
OPTIONAL
DISCHARGE
AIR SENSOR
OPTIONAL
OUTDOOR
AIR SENSOR
OPTIONAL
OUTDOOR
AIR SENSOR
icomfort Toucht
THERMOSTAT
icomfortt TOUCH
THERMOSTAT
icomfortt− ENABLED
OUTDOOR AIR CONDITIONING
OR HEAT PUMP UNIT
NON−COMMUNICATING
OUTDOOR AIR
CONDITIONING UNIT −
1 OR 2 STAGE
CLIP Y1 TO Y2 FOR
TWO−STAGE OPERATION
FIGURE 41
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Optional Accessories for use with any icomfort Touch
t
System
icomfortt−
NOTE: icomfortt THERMOSTAT SENSES HUMIDITY & CONTROLS
24V ꢂH" OUTPUT (& 120V ꢂH" OUTPUT) TO CYCLE HUMIDIFIER
BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT
REQUIRED.
ENABLED
SLP98DFV
FURNACE
OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HU-
MIDIFIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER
FUNCTIONS. BUILT INTO ALL icomfortt OUTDOOR UNITS).
DISCHARGE AIR SENSOR
icomfort Touch
THERMOSTAT
t
NOTE: 24V UV LIGHT
APPLICATIONS
Furnace transformer will not have ad-
equate va to power 24v UV light ap-
plications. An additional transformer
for UV light applications is required.
icomfortt−
ENABLED
SLP98DFV
FURNACE
icomfortt−
ENABLED
SLP98DFV
icomfortt− ENABLED
OUTDOOR AIR
CONDITIONING OR
HEAT PUMP UNIT
HEPA BYPASS FILTER
X2680 HEPA
INTERLOCK KIT
FURNACE
PASS INDOOR BLOWER
MOTOR COMMON WIRE
THROUGH CURRENT LOOP.
SEE HEPA INTERLOCK KIT
FOR INSTALLATION DE-
TAILS
icomfortt−
ENABLED
SLP98DFV
FURNACE
LVCS VENTILATION
CONTROL SYSTEM
icomfortt−
ENABLED
SLP98DFV
FURNACE
SEE LVCS VENTILATION
INSTRUCTIONS FOR
DAMPER & SENSOR WIRING
NON−COMMUNICATING
1 OR 2 STAGE AC OR HP UNIT
(C)
(C)
(disables out-
door unit only)
FIGURE 42
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TABLE 14
Field Wiring Connections for Non−Communicating Thermostat Applications
W914
W915
(DS to R)
Dehumidifi-
cation or
W951
(O to R)
Heat Pumps
(Y1 to Y2)
Two−Stage
Cooling
Thermostat
Wiring Connections
DIP Switch 1
Harmony
IIIt
1Heat / 1 Cool
ON
Intact
Intact
Intact
Cut
Intact
Intact
Intact
S1
T’STAT
CONTROL
TERM. STRIP
OUTDOOR
UNIT
NOTE − Use DIP
switch 3 to set
second−stage
heat ON delay.
OFF−7 minutes.
ON−12 minutes.
*
1 Heat / 2 Cool
ON
Cut
S1
T’STAT
CONTROL
TERM. STRIP
OUTDOOR
UNIT
NOTE − Use DIP
switch 3 to set
second−stage
heat ON delay.
OFF−7 minutes.
ON−12 minutes.
*
1 Heat / 2 Cool
with t’stat with
dehumidification
mode
ON
Cut
S1
T’STAT
CONTROL
TERM. STRIP
OUTDOOR
UNIT
NOTE − Use DIP
switch 3 to set
second−stage
*
heat ON delay.
OFF−7 minutes.
ON−12 minutes.
* ꢀR" required on some units.
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Field Wiring for Non−Communicating Applications (Continued)
W914
W915
(DS to R)
(Y1 to Y2)
Two−Stage
Cooling
W951
(O to R)
Heat Pumps
Dehumidifi-
cation or
Harmony
Thermostat
Wiring Connections
DIP Switch 1
IIIt
2 Heat / 2 Cool
OFF
Cut
Intact
Intact
Intact
Intact
S1
T’STAT
CONTROL
TERM. STRIP
OUTDOOR
UNIT
*
2 Heat / 2 Cool
with t’stat with
dehumidifica-
tion mode
OFF
Cut
Cut
S1
T’STAT
CONTROL OUTDOOR
TERM. STRIP
UNIT
*
2 Heat / 1 Cool
OFF
Intact
Intact
S1
T’STAT
CONTROL
TERM. STRIP
OUTDOOR
UNIT
*
* ꢀR" required on some units.
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Field Wiring for Non−Communicating Applications (Continued)
W914
W915
(DS to R)
Dehumidifi-
cation or
W951
(O to R)
Heat Pumps
(Y1 to Y2)
Two−Stage
Cooling
Wiring Connections
Thermostat
DIP Switch
Harmony
IIIt
CONTROL
TERM. STRIP
HEAT PUMP
Dual Fuel
Single−Stage
Heat Pump
DIP Switch 1
OFF
Intact
Intact
Cut
L7724U
T’STAT
H
®
ComfortSense
7000 L7724U
thermostat w/
dual fuel capa-
bilities
67M41*
L
Y
L
Capable of
2−stage gas
heat control
Y2
D
B
Y2
T
T
outdoor
sensor
L7724U
T’STAT
CONTROL TERM.
STRIP
Dual Fuel
Two−Stage
Heat Pump
DIP Switch 1
OFF
Cut
Intact
Cut
HEAT PUMP
H
®
67M41*
ComfortSense
7000 L7724U
thermostat w/
dual fuel capa-
bilities
L
L
Capable of
2−stage gas
heat control
Y2
Y2
D
B
out blue
T
T
outdoor
sensor
* Connect W1 to W1 ONLY if using defrost tempering kit 67M41
NOTE − Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the SLP98DFV
integrated control.
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Integrated Control
INTEGRATED CONTROL
NEUTRAL
TERMINALS
COMBUSTION
AIR INDUCER
CONNECTOR
IGNITOR
CONNECTOR
FLAME
SENSE
DIAGNOSTIC
PUSH BUTTON
LINE VOLTAGE
TERMINALS
HUM
EAC
DIP SWITCHES
INDOOR
BLOWER
CONNECTOR
OUTDOOR AIR
SENSOR
TERMINALS
7−SEGMENT
DIAGNOSTIC LED
W915 Y1 TO Y2
W951 R TO O
DISCHARGE AIR
SENSOR
TERMINALS
W914 R TO DS
FACTORY TEST
HEADER PINS.
FACTORY USE ONLY.
W915
W951
W914
L − use only with
communicating T’stat and
non−communicating outdoor
unit.
TB83 OUTDOOR
TB84 INDOOR
RS−BUS LINK (TB82, future use)
I+ = DATA HIGH CONNECTION
I − = DATA LOW CONNECTION
THERMOSTAT CONNECTIONS (TB1)
DS = DEHUMIDIFICATION SIGNAL
RS−BUS OUTDOOR (TB83)
W2 = HEAT DEMAND FROM 2ND STAGE T/STAT
W1 = HEAT DEMAND FROM 1ST STAGE T/STAT
R = CLASS 2 VOLTAGE TO THERMOSTAT
G = MANUAL FAN FROM T’STAT
R = 24VAC
I + = DATA HIGH CONNECTION
I − = DATA LOW CONNECTION
C = 24VAXC COMMON
RS−BUS INDOOR (TB84)
C = THERMOSTAT SIGNAL GROUNCONNECTED TO
TRANSFORMER GRD (TR) & CHASIS GROUND (GRD)
R = 24VAC
I + = DATA HIGH CONNECTION
I − = DATA LOW CONNECTION
C = 24VAXC COMMON
Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL
Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL
O = THERMOSTAT SIGNAL TO HEAT PUMP
REVERSING VALVE
1/4" QUICK CONNECT TERMINALS
H = 24V HUMIDIFIER OUTPUT. DO NOT CONNECT
®
TO COMFORTSENSE THERMOSTAT
HUM = 120 VAC OUTPUT TO HUMIDIFIER
XMFR = 120 VAC OUTPUT TO TRANSFORMER
L = USE ONLY WITH A COMMUNICATING THERMOSTAT
AND A NON−COMMUNICATING OUTDOOR UNIT
LI = 120 VAC INPUT TO CONTROL
DH = DEHUMIDIFICATION OUTPUT COMMUNICATING
THERMOSTAT ONLY
CIRC = 120 VAC OUTPUT TO CIRCULATING BLOWER
EAC = 120 VAC OUTPUT TO ELECTRICAL AIR CLEANER
NEUTRALS = 120 VAC NEUTRAL
FIGURE 44
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TABLE 15
Non−Communicating Thermostat Selection Switch Settings
Operation
Thermostat
Switch 1
Switch 2
Switch 3
Variable Capacity Heat
(35% to 100%)
Two−Stage
Off
On
Off
Three−Stage Heat
(35%, 70%, 100%)
Single−Stage
On
Off
2nd stage delay
OFF = 7 minutes
ON = 12 minutes
3rd stage delay
10 minutes fixed
Two−Stage Heat (W1 70%, W2 100%)
Two−Stage
Off
Off
Off
NOTE − When the SLP98DFV is used with an icomfort
Toucht communicating thermostat, all indoor blower
speed selections and DIP switch settings are made by the
communicating thermostat.
(time that the blower operates after the heating demand
has been satisfied) can be adjusted by moving switches 4
and 5 on the integrated control. The unit is shipped from the
factory with a blower−off delay of 90 seconds. The blower
off delay affects comfort and is adjustable to satisfy individ-
ual applications. Adjust the blower off delay to achieve a
supply air temperature between 90° and 110°F at the exact
moment that the blower is de−energized. Longer off delay
settings provide lower supply air temperatures; shorter set-
vides the blower off timings that will result from different
switch settings.
SLP98DFV units are equipped with an integrated control.
This control manages ignition timing, combustion air induc-
er speed, heating mode fan off delays and indoor blower
speeds based on selections made using the control DIP
switches and on−board links. The control includes an inter-
nal Watchguard feature which automatically resets the
ignition control when it has been locked out.
NOTE − All DIP switches are factory shipped in the
ꢀOFF" position.
TABLE 16
Blower Off Delay Switch Settings
Blower Off Delay
(Seconds)
60
Switch 4
Switch 5
Switch 1 −− Thermostat Selection −−This unit may be used
with either a single−stage or two−stage thermostat. The
thermostat selection is made using a DIP switch which
must be properly positioned for the particular application.
The DIP switch is factory−positioned for use with a two−
stage thermostat. If a single−stage thermostat is to be used,
the DIP switch must be repositioned. See table 15.
Off
Off
On
On
On
Off
Off
On
90 (factory)
120
180
Indoor Blower Operation DIP Switch Settings
Switches 6 and 7 −− Continuous Indoor Fan Operation-
Blower Speed −− The unit is shipped from the factory with
the DIP switches positioned for medium low (2) speed dur-
ing continuous indoor blower operation. The table below
provides the continuous blower speeds that will result from
different switch settings. Refer to tables beginning on page
37 for corresponding cfm values.
Switch 2 −− Operating Mode with Two−Stage Thermo-
stat −− If a two−stage thermostat is used, the furnace can
operate in either variable−capacity or conventional two−
stage mode. When variable−capacity mode is selected, the
firing rate of the unit is varied to maximize comfort. Conven-
tional two−stage mode is the factory default setting. See
TABLE 17
Continuous Indoor Blower Operation −− Blower Speeds
Switch 3 −− Second−Stage Heat On Delay −− If a single−
stage thermostat is used, the integrated control can be
used to energize second−stage heat after either 7 minutes
Speed
Switch 6
Switch 7
1 − Low
Off
On
2 − Medium Low
(Factory)
Off
Off
3 − Medium High
4 − High
On
On
Off
On
Switches 4 and 5 −− Blower−Off Delay −− The blower−on
delay of 45 seconds is not adjustable. The blower−off delay
Page 37
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Switches 8 and 9 −− Cooling Mode Blower Speed −− The
unit is shipped from the factory with the DIP switches posi-
tioned for high speed (4) indoor blower motor operation
during the cooling mode. The table below provides the
cooling mode blower speeds that will result from different
switch settings. Refer to tables beginning on page 37 for
corresponding cfm values.
TABLE 20
Cooling Mode Blower Speed Ramping
Ramping Option
Switch 12
Switch 13
A (Factory)
Off
On
Off
On
Off
Off
On
On
B
C
D
TABLE 18
Cooling Mode Blower Speeds
Ramping Option A (Factory Selection)
D Motor runs at 50% for 30 seconds.
Speed
Switch 8
On
Switch 9
On
D Motor then runs at 82% for approximately 7−1/2 minu-
tes.
1 − Low
D If demand has not been satisfied after 7−1/2 minutes,
motor runs at 100% until demand is satisfied.
D Once demand is met, motor runs at 50% for 30 sec-
onds then ramps down to stop.
2 − Medium Low
3 − Medium High
4 − High (Factory)
Off
On
On
Off
Off
Off
Switches 10 and 11 −− Cooling Mode Blower Speed Ad-
justment −− The unit is shipped from the factory with the
DIP switches positioned for NORMAL (no) adjustment.
The DIP switches may be positioned to adjust the blower
speed by +10% or −10% to better suit the application. Table
19 provides blower speed adjustments that will result from
different switch settings. Refer to tables beginning on page
37 for corresponding cfm values.
7 1/2 MIN
82% CFM
100%
CFM
OFF
OFF
1/2 MIN
50% CFM
1/2 MIN
50% CFM
COOLING DEMAND
Ramping Option B
D Motor runs at 82% for approximately 7−1/2 minutes. If
demand has not been satisfied after 7−1/2 minutes,
motor runs at 100% until demand is satisfied.
With switches 10 and 11 set to ON, motor will bypass ramp-
ing profiles and all delays and will immediately run at se-
lected COOLING speed upon a call for cool. LED will con-
tinue to operate as normal. This mode is used to check
motor operation.
D
O
n
c
e
d
e
m
a
n
d
i
s
m
e
t
,
m
o
t
o
r
r
a
m
p
s
d
o
w
n
t
o
s
t
o
p
.
7 1/2 MIN
82%CFM
100% CFM
OFF
OFF
COOLING DEMAND
TABLE 19
Cooling Mode Blower Speed Adjustment
Adjustment
+10% (approx.)
NORMAL (Factory)
−10% (approx.)
MOTOR TEST
Switch 10
Switch 11
Ramping Option C
D Motor runs at 100% until demand is satisfied.
On
Off
Off
On
Off
Off
On
On
D
O
n
c
e
d
e
m
a
n
d
i
s
m
e
t
,
m
o
t
o
r
r
u
n
s
a
t
1
0
0
%
f
o
r
4
5
s
e
c
-
onds then ramps down to stop.
100% CFM
100% CFM
45 SEC.
OFF
OFF
Switches 12 and 13 −− Cooling Mode Blower Speed
Ramping −− Blower speed ramping may be used to en-
hance dehumidification performance. The switches are
factory set at option A which has the greatest effect on
mode blower speed ramping options that will result from
different switch settings. The cooling mode blower speed
ramping options are detailed below.
COOLING DEMAND
Ramping Option D
D Motor runs at 100% until demand is satisfied.
D
O
n
c
e
d
e
m
a
n
d
i
s
m
e
t
,
m
o
t
o
r
r
a
m
p
s
d
o
w
n
t
o
s
t
o
p
.
100% CFM
NOTE − The off portion of the selected ramp profile only ap-
OFF
OFF
COOLING
DEMAND
plies during heat pump operation in dual fuel applications.
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Switches 14 through 19 −− Heating Mode Blower Speed
−− These switches are factory set at the OFF position which
provides 100 % of normal speed during HIGH HEAT de-
mand, 70% of normal speed during MID−RANGE HEAT
demand and 35% of normal speed during LOW HEAT de-
mand. Switches 14, 15 and 16 are used to adjust the LOW
HEAT blower motor speed. Switches 17, 18 and 19 are
used to adjust the HIGH HEAT blower motor speed. Table
21 provides the heating mode blower speeds that will result
from different switch settings. Refer to tables beginning on
page 37 for corresponding cfm values.
On−board link W915 is a clippable connection between ter-
minals Y1 and Y2 on the integrated control. W915 must be
cut if two−stage cooling will be used. If the link is not cut the
outdoor unit will operate in second−stage cooling only.
The seven−segment diagnostic LED displays operating
status, target airflow, error codes and other information.
The diagnostic push button is located adjacent to the
seven−segment diagnostic LED. This button is used to en-
able the Error Code Recall mode and the Field Test mode.
Press the button and hold it to cycle through a menu of op-
tions. Every five seconds a new menu item will be dis-
played. When the button is released, the displayed item will
be selected. Once all items in the menu have been dis-
played, the menu resumes from the beginning until the but-
ton is released.
TABLE 21
Low Heat Blower Speeds
Blower
DIP SWITCH SETTINGS
Thermostat
Demand
Speed
Adjust-
ments
14
15
16
+15%
+7.5%
Normal
−7.5%
−15%
On
On
Off
On
On
Off
Off
Off
On
On
On
Off
Off
Off
On
Low Heat
(R to W1)
Error Code Recall Mode
Select "E" from the menu to access the most recent ten er-
ror codes. Select ꢂc" from the Error Code Recall menu to
clear all error codes. Button must be pressed a second time
while ꢂc" is flashing to confirm command to delete codes.
Press the button until a solid ꢂ≡" is displayed to exit the Error
Code Recall mode.
TABLE 22
High Heat Blower Speeds
Blower
DIP SWITCH SETTINGS
Thermostat
Demand
Speed
Adjust-
ments
Field Test Mode
17
18
19
Use the diagnostic push button to scroll through the menu
as described above. Release the button when the LED
flashes ꢂ−" to select the Field Test mode.
+15%
+7.5%
Normal
On
On
Off
On
On
Off
Off
Off
On
On
On
Off
Off
Off
On
High Heat
(R to
W1 & W2)
While in the Field Test mode the technician can:
−7.5%
−15%
D Initiate furnace ignition and move to and hold low−fire
rate by applying a R to W1 jumper.
D Initiate furnace ignition sequence and move to and
hold high−fire rate by applying a jumper from R to W1
and W2.
On−Board Links
On−Board links must be clipped (when applicable) before
unit is placed into operation with a non−communicating
thermostat.
D Initiate furnace ignition sequence and move to and
hold mid−fire rate by applying a jumper to R and W2.
On−Board Link W914 (DS to R) −− Figure 44
D Apply then remove the jumper from R to W1 and W2 to
change the firing rate from low fire to mid fire and high
fire.
On−board link W914 is a clippable connection between ter-
minals DS and R on the integrated control. W914 must be
cut when the furnace is installed with either the Harmony
IIIt zone control or a thermostat which features humidity
control. If the link is left intact the PMW signal from the Har-
mony III control will be blocked and also lead to control
plications including SLP98DFV, a thermostat which fea-
tures humidity control and a single−speed outdoor unit.
a two−speed outdoor unit.
D A vent calibration sequence can be initiated even if a
thermostat signal is not present. Press and hold the
push button until a solid ꢂC" is displayed. Release the
button and calibration will begin. The furnace will per-
form the high−fire and low−fire pressure switch calibra-
tions and display ꢂCAL". After calibration, the LED will
return to the flashing ꢂ−" display.
During Field Test mode operation, all safety switches are
still in the circuit (they are not by−passed) and indoor blower
performance and timings will match DIP switch selections.
Current furnace firing rate, indoor blower CFM and flame
signal will be displayed. To exit the Field Test mode, press
and hold the button. The menu will resume from the begin-
ning. Also, cycle the main power to exit the Field Test mode.
The integrated control will automatically exit the Field Test
mode after 45 minutes of operation.
On−board link W951 is a clippable connection between ter-
minals R and O on the integrated control. W951 must be cut
when the furnace is installed in applications which include a
heat pump unit and a thermostat which features dual fuel
use. If the link is left intact, terminal ꢂO" will remain ener-
gized eliminating the HEAT MODE in the heat pump.
Page 39
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BLOWER DATA
SLP98DF070V36B BLOWER PERFORMANCE (less filter)
HEATING BLOWER PERFORMANCE
Heating Input Range and Blower Volume - CFM
Heating Adjust CFM Selections
35%
495
473
450
430
410
40%
543
516
489
467
444
50%
639
604
568
540
512
60%
735
691
647
614
580
70%
830
778
726
687
649
80%
926
866
805
761
717
90%
1022
953
884
834
785
100%
1118
1041
963
Increase (+15%) Heat CFM
Increase (+7.5%) Heat CFM
Default Heat CFM
Decrease (-7.5% ) Heat CFM
Decrease (-15% ) Heat CFM
908
853
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Selections
Low
Medium-
Low
Medium
High
High
(Default)
Low
Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM
Default Cool CFM
625
575
520
785
710
615
890
830
710
995
890
820
910
845
755
1075
960
1230
1125
985
1365
1265
1150
Decrease (-10%) Cool CFM
885
SLP98DF090V36C BLOWER PERFORMANCE (less filter)
HEATING BLOWER PERFORMANCE
Heating Input Range and Blower Volume - CFM
Heating Adjust CFM Selections
35%
710
670
629
559
488
40%
50%
848
799
749
681
614
60%
940
885
829
763
697
70%
1033
971
910
845
781
80%
1125
1057
990
90%
1217
1143
1070
1009
948
100%
1309
1230
1150
1091
1032
Increase (+15%) Heat CFM
Increase (+7.5%) Heat CFM
Default Heat CFM
756
713
669
599
530
Decrease (-7.5% ) Heat CFM
Decrease (-15% ) Heat CFM
927
865
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Selections
Low
Medium-
Low
Medium
High
High
(Default)
Low
Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM
Default Cool CFM
610
545
465
770
690
620
900
805
720
1035
920
920
835
750
1080
1000
890
1215
1135
1025
1385
1255
1145
Decrease (-10%) Cool CFM
810
The effect of static pressure is included in air volumes shown.
The following control configurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts firing rate based on first- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts firing rate based on first- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 250 cfm.
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BLOWER DATA
SLP98DF090V48C BLOWER PERFORMANCE (less filter)
HEATING BLOWER PERFORMANCE
Heating Input Range and Blower Volume - CFM
Heating Adjust CFM Selections
35%
723
690
656
601
545
40%
790
752
714
654
593
50%
925
878
831
761
690
60%
1060
1004
948
70%
1195
1129
1064
974
80%
1329
1255
1181
1081
981
90%
1464
1381
1297
1188
1078
100%
1599
1507
1414
1295
1175
Increase (+15%) Heat CFM
Increase (+7.5%) Heat CFM
Default Heat CFM
Decrease (-7.5% ) Heat CFM
Decrease (-15% ) Heat CFM
867
787
884
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Selections
Low
Medium-
Low
Medium
High
High
(Default)
Low
Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM
Default Cool CFM
775
690
635
940
875
755
1100
975
915
1255
1135
1025
1120
1000
920
1340
1220
1100
1535
1425
1270
1745
1625
1470
Decrease (-10%) Cool CFM
SLP98DF090V60C BLOWER PERFORMANCE (less filter)
HEATING BLOWER PERFORMANCE
Heating Input Range and Blower Volume - CFM
Heating Adjust CFM Selections
35%
653
603
553
510
467
40%
50%
877
813
748
690
632
60%
1027
953
878
811
70%
1176
1092
1009
931
80%
1326
1232
1139
1051
963
90%
1475
1372
1269
1171
1074
100%
1625
1512
1399
1292
1184
Increase (+15%) Heat CFM
Increase (+7.5%) Heat CFM
Default Heat CFM
728
673
618
570
522
Decrease (-7.5% ) Heat CFM
Decrease (-15% ) Heat CFM
743
853
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Selections
Low
Medium-
Low
Medium
High
High
(Default)
Low
Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM
Default Cool CFM
1110
1000
885
1265
1145
1060
1395
1275
1145
1600
1445
1265
1600
1445
1265
1750
1625
1445
1965
1805
1645
2130
1975
1805
Decrease (-10%) Cool CFM
The effect of static pressure is included in air volumes shown.
The following control configurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts firing rate based on first- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts firing rate based on first- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 380 cfm (SLP98DF090V48C) and 450 cfm (SLP98DF090V60C).
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BLOWER DATA
SLP98DF110V60C BLOWER PERFORMANCE (less filter)
HEATING BLOWER PERFORMANCE
Heating Input Range and Blower Volume - CFM
Heating Adjust CFM Selections
35%
811
744
677
626
575
40%
906
835
764
707
650
50%
1096
1017
938
60%
1286
1199
1112
1031
950
70%
1475
1380
1285
1193
1101
80%
1665
1562
1459
1355
1251
90%
1855
1744
1633
1517
1401
100%
2045
1926
1807
1679
1551
Increase (+15%) Heat CFM
Increase (+7.5%) Heat CFM
Default Heat CFM
Decrease (-7.5% ) Heat CFM
Decrease (-15% ) Heat CFM
869
800
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Selections
Low
Medium-
Low
Medium
High
High
(Default)
Low
Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM
Default Cool CFM
1090
965
1260
1125
1030
1395
1285
1125
1580
1440
1270
1580
1440
1270
1790
1625
1470
1990
1845
1655
2180
2000
1845
Decrease (-10%) Cool CFM
860
The effect of static pressure is included in air volumes shown.
The following control configurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts firing rate based on first- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts firing rate based on first- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm.
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TABLE 24
COOLING OPERATING SEQUENCE
SLP98DFV and Single−Stage Outdoor Unit
OPERATING
SEQUENCE
SYSTEM DEMAND
Demand Relative Humidity
SYSTEM RESPONSE
Blower
CFM
(COOL)
System
Condition
Step
Compressor
Comments
1st
stage
O
G
Status
D*
NO CALL FOR DEHUMIDIFICATION
Normal Operation On
BASIC MODE (only active on a Y1 thermostat demand)
Compressor and indoor
blower follow thermostat
demand
24
VAC
1
On On Acceptable
High
100%
24
VAC
Normal Operation
1
2
On
On
On On Acceptable
On On Demand
High
High
100%
70%
Thermostat energizes Y1
and de−energizes D on a
call for de−humidification
Dehumidification
Call
0
VAC
PRECISION MODE (operates independent of a Y1 thermostat demand)
24
VAC
Normal Operation
1
2
On
On
On On Acceptable
High
High
100%
70%
Dehumidification mode
begins when humidity is
greater than set point
Dehumidification
call
0
VAC
On On
On On
Demand
Demand
Dehumidification
call ONLY
0
VAC
1
On
High
70%
Thermostat will keep out-
door unit energized after
cooling temperature set-
point has been reached in
order to maintain room
humidity setpoint.
On−board links at indoor unit with a single−stage outdoor unit:
®
With Condensing unit − Cut W914 (R to DS) on SureLight control;
With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight
control.
®
®
*ComfortSense 7000 thermostat ony
Page 43
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TABLE 25
COOLING OPERATING SEQUENCE
SLP98DFV and Two−Stage Outdoor Unit
OPERATING
SEQUENCE
SYSTEM DEMAND
SYSTEM RESPONSE
Blower
Demand
Relative Humidity
System
Condition
Step
Compressor
Comments
CFM
(COOL)
1st
stage
2nd
stage
G
O
Status
D*
NO CALL FOR DEHUMIDIFICATION
Normal Operation −
Y1
24
VAC
On
On
1
2
On
On
On
On
Acceptable
Acceptable
Low
70%
Compressor and indoor
blower follow thermostat
demand
Normal Operation −
Y2
24
VAC
On
High
100%
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
24
VAC
Thermostat energizes
2nd stage and de−ener-
gizes D on a call for de−
humidification
On
On
Normal Operation
1
2
On
On
On
On
Acceptable
Demand
Low
70%
70%
Dehumidification
Call
0
VAC
On
High
PRECISION MODE (operates independent of a Y1 thermostat demand)
24
VAC
On
On
Normal Operation
1
2
On
On
On
On
Acceptable
Demand
Low
70%
70%
Dehumidification mode
begins when humidity is
greater than set point
Dehumidification
call
0
VAC
On
On
High
Thermostat will keep out-
door unit energized after
cooling temperature set-
point has been reached
in order to maintain room
humidity setpoint.*
Dehumidification
call ONLY
0
VAC
On
1
On
On
Demand
High
70%
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
24
VAC
Thermostat energizes
2nd stage and de−ener-
gizes D on a call for de−
humidification
On
On
On
On
Normal Operation
1
2
On
On
On
On
Acceptable
Demand
High
High
100%
70%
Dehumidification
Call
0
VAC
PRECISION MODE (operates independent of a Y1 thermostat demand)
24
VAC
On
On
Normal Operation
1
2
On
On
On
On
Acceptable
Demand
Low
70%
70%
Dehumidification mode
begins when humidity is
greater than set point
Dehumidification
call
0
VAC
On
On
High
Dehumidification
call ONLY
0
VAC
On
1
On
On
Demand
High
70%
Thermostat will keep out-
door unit energized after
cooling temperature set-
point has been reached
in order to maintain room
humidity setpoint.
On−board links at indoor unit with a two−stage outdoor unit:
Cut factory link from Y1 to Y2 or cut W915 (Y1 to Y2) on SureLight inte-
grated control.
®
®
With Condensing unit − Cut W914 (R to DS) on SureLight integrated control;
®
With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight
integrated control.
®
*ComfortSense 7000 thermostat only
Page 44
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BEFORE BEFORE PLACING THE UNIT INTO OPERA-
TION, smell all around the furnace area for gas. Be sure
to smell next to the floor because some gas is heavier
than air and will settle on the floor.
Unit Start−Up
FOR YOUR SAFETY READ BEFORE OPERATING
The gas valve on the SLP98DFV is equipped with a gas
control switch. Use only your hand to move the control
switch. Never use tools. If the switch will not move by
hand, do not try to repair it. Force or attempted repair may
result in a fire or explosion.
WARNING
Do not use this furnace if any part has been under-
water. A flood−damaged furnace is extremely dan-
gerous. Attempts to use the furnace can result in
fire or explosion. Immediately call a qualified ser-
vice technician to inspect the furnace and to replace
all gas controls, control system parts, and electrical
parts that have been wet or to replace the furnace,
if deemed necessary.
Placing the furnace into operation:
SLP98DFV units are equipped with an automatic ignition
system. Do not attempt to manually light burners on this
furnace. Each time the thermostat calls for heat, the
burners will automatically light. The ignitor does not get
hot when there is no call for heat on units with this ignition
system.
WARNING
Danger of explosion. Can cause injury
or product or property damage. Should
the gas supply fail to shut off or if
overheating occurs, shut off the gas
valve to the furnace before shutting off
the electrical supply.
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
1 − STOP! Read the safety information at the beginning of
this section.
CAUTION
2 − Set the thermostat to the lowest setting.
3 − Turn off all electrical power to the unit.
Before attempting to perform any service or mainte-
nance, turn the electrical power to unit OFF at dis-
connect switch.
4 − This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
WARNING
During blower operation, the ECM motor emits ener-
gy that may interfere with pacemaker operation. In-
terference is reduced by both the sheet metal cabinet
and distance.
5 − Remove the access panel.
6 − Move the gas valve switch to the OFF position. See
7 − Wait five minutes to clear out any gas. If you then smell
gas, STOP! Immediately call the gas supplier from a
neighbor’s phone. Follow the gas supplier’s instruc-
tions. If you do not smell gas go to next step.
Priming Condensate Trap
The condensate trap should be primed with water prior to
start−up to ensure proper condensate drainage. Either
pour 10 fl. oz. (300 ml) of water into the trap, or follow
these steps to prime the trap:
8 − Move gas valve switch to the ON position. See figure
45. Do not force.
GAS VALVE
NEGATIVE AIR
PRESSURE PORT
PRESSURE PORT
1 − Follow the lighting instructions to place the unit into op-
eration.
POSITIVE AIR
2 − Set the thermostat to initiate a heating demand.
3 − Allow the burners to fire for approximately 3 minutes.
4 − Adjust the thermostat to deactivate the heating de-
mand.
OUTLET
INLET
5 − Wait for the combustion air inducer to stop. Set the
thermostat to initiate a heating demand and again al-
low the burners to fire for approximately 3 minutes.
6 − Adjust the thermostat to deactivate the heating de-
mand and again wait for the combustion air inducer to
stop. At this point, the trap should be primed with suffi-
cient water to ensure proper condensate drain opera-
tion.
SUPPLY
PRESSURE
TAP
MANIFOLD
PRESSURE TAP
GAS VALVE SHOWN IN THE ON POSITION
FIGURE 45
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9 − Replace the access panel.
SLP98DFV units require no manifold pressure adjust-
ments for operation at altitudes up to 10,000 feet (3048 m)
above sea level. Units installed at altitude of 7,501 to
10,000 feet (2287 to 3048m) require a pressure switch
ments and manifold pressures at all altitudes.
10− Turn on all electrical power to to the unit.
11− Set the thermostat to desired setting.
NOTE − When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.
The combustion air pressure switch is factory−set and re-
quires no adjustment.
12− If the appliance will not operate, follow the instructions
ꢂTurning Off Gas to Unit" and call the gas supplier.
NOTE − A natural to LP/propane gas changeover kit is nec-
essary to convert this unit. Refer to the changeover kit
installation instruction for the conversion procedure.
Turning Off Gas to Unit
1 − Set the thermostat to the lowest setting.
2 − Turn off all electrical power to the unit if service is to be
performed.
Gas Pressure Measurement
Gas Flow (Approximate)
3 − Remove the access panel.
TABLE 26
GAS METER CLOCKING CHART
Seconds for One Revolution
4 − Move the gas valve switch to the OFF position.
5 − Replace the access panel.
Natural
LP
SLP98
Unit
Failure To Operate
1 cu ft
Dial
55
2 cu ft
Dial
1 cu ft
Dial
2 cu ft
DIAL
If the unit fails to operate, check the following:
1 − Is the thermostat calling for heat?
2 − Are access panels securely in place?
3 − Is the main disconnect switch closed?
4 − Is there a blown fuse?
−070
−090
−110
−135
110
82
136
102
82
272
204
164
136
41
33
66
27
54
68
Natural−1000 btu/cu ft
LP−2500 btu/cu ft
5 − Is the filter dirty or plugged? Dirty or plugged filters will
cause the limit control to shut the unit off.
Furnace should operate at least 5 minutes before check-
ing gas flow. Determine time in seconds for two revolu-
tions of gas through the meter. (Two revolutions assures a
more accurate time.) Divide by two and compare to time
and rate is incorrect, check gas orifices for proper size and
restriction. Remove temporary gas meter if installed.
6 − Is gas turned on at the meter?
7 − Is the manual main shut-off valve open?
8 − Is the gas valve turned on?
9 − Is the unit ignition system in lock out? If the unit locks out
again, inspect the unit for blockages.
10 − Is blower harness connected to ignition control? Fur-
nace will not operate unless harness is connected.
NOTE − To obtain accurate reading, shut off all other gas
appliances connected to meter.
Supply Pressure Measurement
A threaded plug on the inlet side of the gas valve provides
access to the supply pressure tap. Remove the threaded
plug, install a field−provided barbed fitting and connect a
manometer to measure supply pressure. Replace the
threaded plug after measurements have been taken.
High Altitude Information
NOTE − In Canada, certification for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local au-
thorities.
TABLE 27
Conversion Kit Requirements and Manifold Test Pressures
LP/Propane
Kit
High Altitude Pressure
Manifold Pressure at All Altitudes (in. w.g.)
Switch Kit
Model
Input
Size
Gas Orifice Size
Low Fire
(35% rate)
High Fire
(100% rate)
7,501 − 10,000
(2287 −
3048m)
0 − 10,000
(0 − 3048 m)
0 − 7,500
(0 − 2286 m)
Natural Gas
LP/Propane
Natural Gas
LP/Propane
Nat
LP
−070
−090
−110
65W77
Not required
74W37
0.40 − 0.60
1.2 − 1.8
3.2 − 3.8
9.5 − 10.5
.0625
.034
Page 46
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Proper Combustion
Other Unit Adjustments
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking com-
bustion. Take combustion sample beyond the flue outlet
and compare to the tables below. The maximum carbon
monoxide reading should not exceed 50 ppm.
Primary Limit
The primary limit is located on the heating compartment
vestibule panel. This limit is factory set and require no ad-
justment.
Flame Rollout Switches (Two)
TABLE 28
High Fire
These manually reset switches are located on the burner
box.
SLP98DFV Unit
070V36B
CO %
2
CO %
For L.P.
For Nat
2
Pressure Switches (Two)
The pressure switches are located in the heating compart-
ment on the combustion air inducer. These switches check
for proper combustion air inducer operation before allow-
ing ignition trial. The switches are factory−set and require
no adjustment. Pressure switch tubing installation is critical
090V36C
7.6 − 8.6
9,1 − 10.1
090V60C
110V60C
TABLE 29
Low Fire
CO %
PRESSURE SWITCH TUBING INSTALLATION
Unit
CO %
For L.P.
2
For Nat
2
070V36B
090V36C
090V60C
110V60C
5.3 − 6.3
6.8 − 7.8
3
4
2
High−Fire
Pressure
Switch
Manifold Pressure Measurement
To correctly measure manifold pressure, the differential
pressure between the positive gas manifold and the nega-
tive burner box must be considered. Use pressure test
adapter kit (available as Lennox part 10L34) to assist in
measurement.
Cold End
Header Box
1
Low−Fire
Pressure
Switch
1 − Remove the threaded plug from the outlet side of the
gas valve and install a field−provided barbed fitting.
Connect test gauge ꢂ+" connection to barbed fitting to
measure manifold pressure.
2 − Tee into the gas valve regulator vent hose and connect
test gauge ꢂ−" connection.
Gas Valve
3 − Start unit on low heat (35% rate) and allow 5 minutes
for unit to reach steady state.
4 − While waiting for the unit to stabilize, notice the flame.
Flame should be stable and should not lift from burner.
Natural gas should burn blue.
5 − After allowing unit to stabilize for 5 minutes, record
manifold pressure and compare to value given in table
27.
1 − Black hose from front port on low−fire pressure switch to
positive port on the gas valve.
6 − Repeat steps 3, 4 and 5 on high heat.
2 − Red hose from rear port on low−fire pressure switch to the
negative port on the gas valve.
NOTE − Shut unit off and remove manometer as soon as an
accurate reading has been obtained. Take care to remove
barbed fitting and replace threaded plug.
3 − Red hose from front port on high−fire pressure switch to
negative port on cold end header box.
4 − Black hose from rear port on high−fire pressure switch to
positive port on cold end header box.
CAUTION
Do not attempt to make adjustments to the gas valve.
FIGURE 46
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Temperature Rise
Applications Using a Two−Stage Thermostat
A − Heating Sequence −− Control Thermostat Selection
DIP switch in ꢁTwo−Stage" Position (Factory Setting)
After the furnace has been started and supply and return air
temperatures have been allowed to stabilize, check the
temperature rise with the unit operating at 100 percent fir-
ing rate. If necessary, adjust the blower speed to maintain
the temperature rise within the range shown on the unit
nameplate. Increase the blower speed to decrease the
temperature. Decrease the blower speed to increase the
temperature rise. Failure to adjust the temperature rise
may cause erratic limit operation.
1 − On a call for heat, thermostat first−stage contacts close
sending a signal to the integrated control. The inte-
grated control runs a self-diagnostic program and
checks high temperature limit switches for normally
closed contacts and pressure switches for normally
open contacts. The combustion air inducer is ener-
gized at ignition speed, which is approximately the
same as the inducer speed at 70 percent firing rate.
Thermostat Heat Anticipation
2 − Once the control receives a signal that the low−fire
pressure switch has closed, the combustion air induc-
er begins a 15−second pre−purge in the ignition speed.
Set the heat anticipator setting (if adjustable) according to
the amp draw listed on the wiring diagram that is attached
to the unit.
3 − After the pre−purge is complete, a 20−second initial ig-
nitor warm−up period begins. The combustion air in-
ducer continues to operate at the ignition speed.
Electrical
1 − Check all wiring for loose connections.
2 − Check for the correct voltage at the furnace (furnace
operating).Correct voltage is 120VAC + 10%.
4 − After the 20−second warm−up period has ended, the gas
valve is energized and ignition occurs. At the same time,
the control module sends a signal to begin an indoor
blower 45−second ON delay. When the delay ends, the
indoor blower motor is energized at a speed that
matches the firing rate. After the 10−second ignition
stabilization delay expires, the inducer speed is ad-
justed to the appropriate target rate. The inducer will
remain at the 70 percent speed as long as the thermo-
stat has a first−stage heating demand.
3 − Check amp−draw on the blower motor with inner
blower panel in place.
Motor Nameplate__________Actual__________
Electronic Ignition
The integrated control has an added feature of an internal
Watchguard control. The feature serves as an automatic re-
set device for ignition control lockout caused by ignition fail-
ure. This type of lockout is usually due to low gas line pres-
sure. After one hour of continuous thermostat demand for
heat, the Watchguard will break and remake thermostat de-
mand to the furnace and automatically reset the control to
begin the ignition sequence.
5 − If second−stage heat is required, the thermostat sec-
ond−stage heat contacts close and send a signal to the
integrated control. The integrated control initiates a
30−second second−stage recognition delay.
6 − At the end of the recognition delay and for all subse-
quent calls for second−stage heat, the integrated con-
trol energizes the combustion air inducer at high
speed. The control also checks the high−fire pressure
switch to make sure it is closed. As the inducer speed
is increased to high, the indoor blower motor is ad-
justed to a speed which is appropriate for second−
stage heat.
Exhaust and Air Intake Pipe
1 − Check exhaust and air intake connections for tightness
and to make sure there is no blockage.
2 − Are pressure switches closed? Obstructed exhaust
pipe will cause unit to shut off at pressure switches.
Check termination for blockages.
3 − Reset manual flame rollout switches on burner box
cover.
7 − When the demand for high−fire (second stage) heat is
satisfied, the gas valve is de−energized and the field−
selected indoor blower off delay begins. The combus-
tion air inducer begins a 20−second post−purge period.
Heating Sequence of Operation
8 − When the combustion air post−purge period is com-
plete, the inducer is de−energized. The indoor blower
is de−energized at the end of the off delay.
The integrated control initiates a pressure switch calibra-
tion at the initial unit start−up on a call for heat. The ignition
control will also initiate a calibration any time main power is
turned off and back on and a heating demand is present .
Additional calibrations may be initiated by the service tech-
nician during field test sequence. The following heating se-
quence of operation assumes completion of a successful
calibration.
Applications Using a Two−Stage Thermostat
B − Heating Sequence −− Control Thermostat Selection
DIP switch in ꢁVariable Capacity" Position
1 − On a call for heat, thermostat first−stage contacts close
sending a signal to the integrated control. The inte-
grated control runs a self-diagnostic program and
checks high temperature limit switches for normally
NOTE − The thermostat selection DIP switch on the integrated
control is factory−set in the ꢀTWO−STAGE" position.
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closed contacts and pressure switches for normally
open contacts. The combustion air inducer is ener-
gized at ignition speed, which is approximately the
same as the inducer speed at 70 percent firing rate.
Applications Using A Single−Stage Thermostat
C − Heating Sequence −− Control Thermostat Selection
DIP switch in ꢁSingle−Stage" Position
1 − On a call for heat, thermostat first−stage contacts close
sending a signal to the integrated control. The inte-
grated control runs a self-diagnostic program and
checks high temperature limit switches for normally
closed contacts and pressure switches for normally
open contacts. The combustion air inducer is ener-
gized at the ignition speed, which is approximately the
same as the inducer speed at 70 percent firing rate.
2 − Once the control receives a signal that the low−fire
pressure switch has closed, the combustion air induc-
er begins a 15−second pre−purge in low speed.
3 − After the pre−purge is complete, a 20−second initial ig-
nitor warm−up period begins. The combustion air in-
ducer continues to operate at the ignition speed.
4 − After the 20−second warm−up period has ended, the gas
valve is energized and ignition occurs. At the same time,
the control module begins an indoor blower 45−second
ON delay. When the delay ends, the indoor blower mo-
tor is energized at a speed that matches the firing rate.
After the 10−second ignition stabilization delay ex-
pires, the inducer speed is adjusted to the appropriate
target rate. If the furnace is operating in the initial heat-
ing cycle after power−up, the initial firing rate will be
approximately 35 percent. The firing rate on subse-
quent cycles will be automatically adjusted by the inte-
grated control based on thermostat cycles. The firing
rate will vary and will range from 35 percent to 90 per-
cent. The furnace will continue this operation as long
as the thermostat has a first−stage heating demand.
2 − Once the control receives a signal that the low−fire
pressure switch has closed, the combustion air induc-
er begins a 15−second pre−purge at the ignition speed.
3 − After the pre−purge is complete, a 20−second initial ig-
nitor warm−up period begins. The combustion air in-
ducer continues to operate at the ignition speed.
4 − After the 20−second warm−up period has ended, the gas
valve is energized and ignition occurs, which initiates a
10−second ignition stabilization delay. At the same time,
the control module sends a signal to begin an indoor
blower 45−second ON delay. When the delay ends, the
indoor blower motor is energized at a speed which is
appropriate for the firing rate. After the 10−second igni-
tion stabilization delay expires, the inducer speed is
adjusted to 35 percent speed. The integrated control
also initiates a second−stage on delay (factory−set at
7 minutes; adjustable to 12 minutes).
5 − If second−stage heat is required, the thermostat sec-
ond−stage heat contacts close and send a signal to the
integrated control. The integrated control either in-
creases the firing rate to 70 percent (if the current rate
is at or below 60 percent) or increases the firing rate
by 10 percent (if the current rate is above 60 percent).
If the call for heat continues 5 minutes beyond this ini-
tial upstage, the rate will be increased by 10 percent
every 5 minutes until the call for heat is satisfied or the
furnace reaches 100 percent rate. As the firing rate in-
creases, the indoor blower motor is adjusted to a
speed which is appropriate for the target rate.
5 − If the heating demand continues beyond the second−
stage on delay, the integrated control energizes the
combustion air inducer at 70 percent speed. The in-
door blower motor is adjusted to a speed which
matches the target rate. A fixed, 10−minute third−stage
on delay is initiated.
6 − If the heating demand continues beyond the third−
stage on delay, the integrated control energizes the in-
ducer at high speed. The indoor blower motor is ad-
justed to a speed which is appropriate for the target
rate.
6 − If second−stage heat demand is satisfied, but first
stage is still present, the furnace will continue to oper-
ate at the present firing rate until the heat cycle ends.
7 − When the thermostat heating demand is satisfied, the
gas valve is de−energized and the combustion air in-
ducer begins a 20−second post−purge. The field−se-
lected indoor blower off delay begins.
7 − When the demand for first− and second−stage heat is
satisfied, the gas valve is de−energized and the field−
selected indoor blower off delay begins. The combus-
tion air inducer begins a 20−second post−purge period.
8 − When the combustion air post−purge period is com-
plete, the inducer is de−energized. The indoor blower
is de−energized at the end of the off delay.
8 − When the combustion air post−purge period is com-
plete, the inducer is de−energized. The indoor blower
is de−energized at the end of the off delay.
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3 − Remove the drain plug from the condensate trap and
empty water. Inspect the trap then reinstall the drain
plug and refill trap with water.
Service
Cleaning Heat Exchanger
If cleaning the heat exchanger becomes necessary, follow
the below procedures and refer to figure 1 when disassem-
bling unit. Use papers or protective covering in front of fur-
nace while removing heat exchanger assembly.
WARNING
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result
in dangerous operation, serious injury, death or
property damage.
Improper servicing could result in dangerous opera-
tion, serious injury, death, or property damage.
Before servicing, disconnect all electrical power to
furnace.
1 − Turn off electrical and gas supplies to the furnace.
2 − Remove the furnace access panels.
3 − Disconnect the 2−pin plug from the gas valve.
4 − Remove gas supply line connected to gas valve. Re-
move the burner box cover and remove gas valve/
manifold assembly.
When servicing controls, label all wires prior to dis-
connecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.
5 − Remove sensor wire from sensor. Disconnect 2-pin
plug from the ignitor.
6 − Disconnect wires from flame roll−out switches.
7 − Loosen clamps at vent elbow. Disconnect condensate
drain tubing from flue collar. and remove the vent el-
bow.
At the beginning of each heating season, system should be
checked as follows by a qualified service technician:
Blower
8 − Remove four burner box screws at the vestibule panel
and remove burner box. Set burner box assembly
aside.
Check the blower wheel for debris and clean if necessary.
The blower motors are prelubricated for extended bearing
life. No further lubrication is needed.
NOTE − If necessary, clean burners at this time. Follow
procedures outlined in Burner Cleaning section.
9 − Mark and disconnect all combustion air pressure tub-
ing from cold end header collector box.
WARNING
10 − Mark and remove wires from pressure switches. Re-
move pressure switches. Keep tubing attached to
pressure switches
The blower access 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 inju-
ry or death.
11 − Disconnect the 4-pin plug from the combustion air in-
ducer. Remove two screws which secure combustion
air inducer to collector box. Remove combustion air in-
ducer assembly. Remove ground wire from vest pan-
el.
Filters
All SLP98DFV filters are installed external to the unit. Fil-
ters should be inspected monthly. Clean or replace the fil-
ters when necessary to ensure proper furnace operation.
12 − Remove electrical junction box from the side of the fur-
nace.
13 − Remove cold end header box.
Exhaust and air intake pipes
14 − Mark and disconnect any remaining wiring to heating
compartment components. Disengage strain relief
bushing and pull wiring and bushing through the hole in
the blower deck.
Check the exhaust and air intake pipes and all connections
for tightness and to make sure there is no blockage.
NOTE − After any heavy snow, ice or frozen fog event the
furnace vent pipes may become restricted. Always check
the vent system and remove any snow or ice that may be
obstructing the plastic intake or exhaust pipes.
15 − Remove the primary limit from the vestibule panel.
16 − Remove two screws from the front cabinet flange at
the blower deck. Spread cabinet sides slightly to allow
clearance for removal of heat exchanger.
Electrical
1 − Check all wiring for loose connections.
17 − Remove screws along vestibule sides which secure
vestibule panel and heat exchanger assembly to cabi-
net. Remove two screws from blower rail which secure
bottom heat exchanger flange. Remove heat ex-
changer from furnace cabinet.
2 − Check for the correct voltage at the furnace (furnace
operating).
3 − Check amp−draw on the blower motor.
Motor Nameplate__________Actual__________
Winterizing and Condensate Trap Care
1 − Turn off power to the unit.
18 − Back wash heat exchanger with soapy water solution
or steam. If steam is used it must be below 275°F
(135°C) .
2 − Have a shallow pan ready to empty condensate water.
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19 − Thoroughly rinse and drain the heat exchanger. Soap
solutions can be corrosive. Take care to rinse entire
assembly.
39 − Replace the blower compartment access panel.
40 − Refer to instruction on verifying gas and electrical con-
nections when re−establishing supplies.
20 − Reinstall heat exchanger into cabinet making sure that
the clamshells of the heat exchanger assembly are
resting on the support located at the rear of the cabi-
net. Remove the indoor blower to view this area
through the blower opening.
41 − Follow lighting instructions to light and operate fur-
nace for 5 minutes to ensure that heat exchanger is
clean and dry and that furnace is operating properly.
42 − Replace heating compartment access panel.
Cleaning the Burner Assembly
21 − Re-secure the supporting screws along the vestibule
sides and top to the cabinet.
1 − Turn off electrical and gas power supplies to furnace.
Remove upper and lower furnace access panels.
2 − Disconnect the 2−pin plug from the gas valve.
3 − Remove the burner box cover.
22 − Reinstall cabinet screws on front flange at blower
deck.
23 − Reinstall the primary limit on the vestibule panel.
4 − Disconnect the gas supply line from the gas valve. Re-
move gas valve/manifold assembly.
24 − Route heating component wiring through hole in blow-
er deck and reinsert strain relief bushing.
5 − Mark and disconnect sensor wire from the sensor. Dis-
connect 2-pin plug from the ignitor at the burner box.
25 − Reinstall electrical junction box.
26 − Reinstall the cold end header box.
6 − Remove four screws which secure burner box assem-
bly to vest panel. Remove burner box from the unit.
27 − Reinstall the combustion air inducer. Reconnect the
combustion air inducer to the wire harness.
7 − Use the soft brush attachment on a vacuum cleaner to
gently clean the face of the burners. Visually inspect
the inside of the burners and crossovers for any block-
age caused by foreign matter. Remove any blockage.
28 − Reinstall pressure switches and reconnect pressure
switch wiring.
29 − Carefully connect combustion air pressure switch
hosing from pressure switches to proper stubs on
cold end header collector box.
8 − Reconnect the sensor wire and reconnect the 2−pin
plug to the ignitor wiring harness.
9 − Reinstall the burner box assembly using the existing
four screws. Make sure that the burners line up in the
center of the burner ports.
30 − Reinstall condensate trap.
31 − Reinstall burner box assembly in vestibule area.
32 − Reconnect exhaust piping and exhaust drain tubing.
33 − Reconnect flame roll−out switch wires.
10 − Reinstall the gas valve manifold assembly. Reconnect
the gas supply line to the gas valve. Reinstall the burn-
er box cover.
34 − Reconnect sensor wire and reconnect 2−pin plug from
ignitor.
11 − Reconnect 2−pin plug to gas valve.
35 − Secure burner box assembly to vestibule panel using
four existing screws. Make sure burners line up in
center of burner ports.
12 − Replace the blower compartment access panel.
13 − Refer to instruction on verifying gas and electrical con-
nections when re−establishing supplies.
36 − Reinstall gas valve manifold assembly. Reconnect
gas supply line to gas valve.
14 − Follow lighting instructions to light and operate fur-
nace for 5 minutes to ensure that heat exchanger is
clean and dry and that furnace is operating properly.
37 − Reinstall burner box cover.
38 − Reconnect 2−pin plug to gas valve.
15 − Replace heating compartment access panel.
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Planned Service
A service technician should check the following items dur-
ing an annual inspection. Power to the unit must be shut off
for the service technician’s safety.
Return air duct − Must be properly attached and provide
an air seal to the unit.
Operating performance − Unit must be observed during
operation to monitor proper performance of the unit and the
vent system.
Burners − Must be inspected for rust, dirt, or signs of water.
Vent pipe − Must be inspected for signs of water, cracked,
Combustion gases − Flue products must be analyzed and
damaged or sagging pipe, or disconnected joints.
compared to the unit specifications.
Problems detected during the inspection may make it nec-
essary to temporarily shut down the furnace until the items
can be repaired or replaced.
Unit appearance − Must be inspected for rust, dirt, signs
of water, burnt or damaged wires, or components.
Blower access door − Must be properly in place and pro-
vide a seal between the return air and the room where the
furnace is installed.
Instruct the homeowners to pay attention to their
furnace. Situations can arise between annual furnace in-
spections that may result in unsafe operation.
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Integrated Control Diagnostic Codes
Press the diagnostic push button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed.
Release the button when the desired mode is displayed.
When a solid "P" is displayed, the furnace capacity/ size is programmed.
When the solid ꢂE" is displayed, the control enters the Error Code Recall mode. Error Code Recall mode menu options: No change (dis-
playing error history) remains in Error Code Recall mode; solid ꢂb" exits Error Code Recall mode; and solid ꢂc" clears the error history. Must
press button while flashing ꢂc" is displayed to clear error codes.
When the solid ꢂ−" is displayed, the control enters the Field Test mode. Field Test mode menu options: Solid ꢂC" starts pressure switch
calibration; blinking ꢂ−" exits Field Test mode.
Code
Diagnostic Codes/Status of Equipment
Action Required to Clear and Recover
.
Idle mode (Decimal blinks at 1 Hertz −− 0.5 second ON, 0.5 second OFF).
A
Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second
OFF) / cfm setting for current mode displayed.
C
d
Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm
setting displayed / Pause / Repeat codes).
Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed /
Pause / Repeat Codes).
h
Variable Capacity Heat (1 second ON, 0.5 second OFF) / % of input rate displayed
/ Pause/ cfm setting / Pause/ Repeat codes.
H
df
Heat Stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm set-
ting displayed / Pause / Repeat codes.
Defrost mode.
E 105 Device communication problem − No other devices on BUS (Communication
system).
Equipment is unable to communicate. Check for mis wire
and loose connections and check for a high voltage source
of noise close to the system. (welder etc.).
E 110 Low line voltage.
Line Voltage low (Voltage lower than nameplate rating)
Check voltage.
E 113 High line voltage.
Line Voltage High (Voltage higher than nameplate rating)
Check voltage.
E 114 Line voltage frequency out−of−range.
E 115 Low 24V − Control will restart if the error recovers.
E 120 Unresponsive device.
No 60 hertz power (Check voltage and frequency).
24 voltage low (Range is 18 to 30 volts) Check voltage.
Usually caused by delay in outdoor unit responding to
indoor unit poling recycle power, check wiring.
E 124 Active communicating thermostat signal missing for more than 3 minutes.
Equipment lost communication with the thermostat. Check
connections and cycle power on the thermostat.
E 125 Control failed self−check, internal error, failed hardware. Will restart if error
recovers. Integrated furnace control not communicating. Covers hardware errors
(flame sense circuit faults, pin shorts, etc.).
Hardware problem on the control board. Cycle power on
control. Replace if problem prevents service and is
persistent.
E 126 Failed internal control communication between microcontrollers.
Hardware problem on the control board. Cycle power on
control. Replace if problem prevents service and is
persistent.
E 131 Corrupted control parameters (Verify configuration of system).
Reconfigure the system. Replace board if service (heating
/cooling) is unavailable.
E 180 Outdoor air sensor failure − NO error if disconnected. Only shown if shorted or
out−of−range.
Compare outdoor sensor resistance to temperature
resistance charts in installation instructions. Replace if
necessary.
E 200 Hard lockout − Rollout circuit open or previously open.
Correct unit cause of rollout trip or replace flame rollout
switch and test furnace operation.
E 201 Indoor blower communication failure − Unable to communicate with blower motor. Indoor blower communication failure including power
outage.
E 202 Indoor blower motor mis−match − Indoor motor horsepower does not match unit
capacity.
Incorrect furnace size code selected. Check unit size
codes on configuration guide or in installation instructions.
E 203 Appliance capacity / size is NOT programmed. Invalid unit codes refer to
configuration flow chart in installation instructions.
No furnace size code selected. Check unit size codes on
configuration guide or in installation instructions.
E 204 Gas valve mis−wired.
Check operation of gas valve.
Check operation of gas valve.
E 205 Gas valve control relay contact shorted.
E 207 Hot surface ignitor sensed open − Refer to troubleshooting in installation
instruction.
Measure resistance of Hot Surface Ignitor, replace if open
or not within specification.
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Integrated Control Diagnostic Codes (continued)
Code
Diagnostic Codes/Status of Equipment
Action Required to Clear and Recover
E 223
Low pressure switch failed open − Refer to troubleshooting in installation
instruction.
Check inches of water column pressure during operation
of low pressure switch on heat call, measure inches of
water column of operating pressure, inspect vent and
combustion air inducer for correct operation and restric-
tion.
E 224
E 225
E 226
E 227
Low pressure switch failed closed − Refer to troubleshooting in installation
instruction.
Check low pressure switch for closed contacts, measure
inches of water column of operating pressure, inspect vent
and combustion air inducer for correct operation and re-
striction.
High pressure switch failed open − Refer to troubleshooting in installation
instruction.
Check inches of water column pressure of high pressure
switch on heat call, measure inches of water column of
operating pressure, inspect vent and combustion air
inducer for correct operation and restriction.
High pressure switch failed closed − Refer to troubleshooting in installation
instruction.
Check high pressure switch for closed contacts, measure
inches of water column of operating pressure, inspect vent
and combustion air inducer for correct operation and
restriction.
Low pressure switch open during trial for ignition or run mode. Refer to trouble- Check inches of water column pressure during operation
shooting in installation instruction.
of low pressure switch on heat call, measure inches of
water column of operating pressure, inspect vent and
combustion air inducer for correct operation and restric-
tion.
E 228
E 240
Unable to perform successful pressure switch calibration.
Retry after 300 seconds. Error counter cleared when exit-
ing lockout, unable to perform pressure switch calibration.
Check vent system and pressure switch wiring
connections.
Low flame current − Run mode − Refer to troubleshooting in
installation instruction.
Check micro amperes of flame sensor, clean or replace
sensor. Measure voltage of neutral to ground for good unit
ground.
E 241
E 250
E 252
E 270
Flame sensed out of sequence − Flame still present.
Shut off gas, check for gas valve leak.
Limit switch circuit open − Refer to troubleshooting in installation instruction.
Discharge air temperature too high (gas heat only).
Check why limit is tripping, overfired, low air flow.
Check temperature rise, air flow and input rate.
Soft lockout − Exceeded maximum number of retries. No flame current sensed. Check for gas flow, ignitor lighting burner, flame sensor
current.
E 271
E 272
E 273
E 274
E 275
Soft lockout − Exceeded maximum number of retries. Last retry failed due to
the pressure switch opening.
See E 223.
Soft lockout − Exceeded maximum number of recycles. Last recycle due to the See E 223 and E 225.
pressure switch opening.
Soft lockout − Exceeded maximum number of recycles. Last recycle due to
flame failure.
See E 240.
Soft lockout − Exceeded maximum number of recycles. Last recycle failed due See E 250.
to the limit circuit opening or limit remained open longer than 3 minutes.
Soft lockout − Flame sensed out of sequence from code 241 fault. Flame signal See E 241.
is gone.
E 276
E 290
E 291
Soft lockout − Exceeded maximum number of calibration retries.
Ignitor circuit fault − Failed ignitor or triggering circuitry.
See E 228.
See E 207.
Restricted air flow − Cubic feet per minute is lower than what is needed for
minimum firing rate.
Check for dirty filter, unit air flow restriction, blower
performance.
E 292
E 294
Indoor blower motor unable to start − Seized bearings, stuck wheel, etc.
Indoor blower motor unable to start (seized
bearing, stuck wheel, etc), replace motor or wheel if
assembly does not operate or meet performance.
Combustion air inducer motor amp draw is too high.
Check combustion blower bearings, wiring , amperes,
replace if it does not operate or meet performance.
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Integrated Control Diagnostic Codes (continued)
Code
Diagnostic Codes/Status of Equipment
Action Required to Clear and Recover
E 295
Indoor blower motor temperature is too high.
Indoor blower motor over temperature (motor
tripped on internal protector), Check motor bear-
ings, amperes. Replace if necessary.
E 310
E 311
Discharge error sensor failure − No error if disconnected. Only shown if
shorted or out−of−range.
Discharge air temperature(DATS) out of range,
code is activated during "Field test mode".
Heat rate reduced to match indoor blower air flow. Replace filter or repair Furnace blower in cutback mode due to restricted
duct restriction.
airflow. Check filter and ductwork. To clear replace
filter if needed or repair/ add ductwork.
E 312
Restricted air flow in cooling or continuous fan mode is lower than cfm
setting.
Restricted airflow − Indoor blower is running at a
reduced cubic feet per minute (Cutback Mode) −
The variable speed motor has pre−set speed and
torque limiters to protect the motor from damage
caused by operating out of its designed parameters
(0 to 0.8 inches water column total external static
pressure). Check filter and ductwork. To clear re-
place filter if needed or repair/ add ductwork.
E 313
Indoor or outdoor unit capacity mismatch.
Incorrect Indoor /outdoor capacity code selected.
Check for proper configuration in installation instruc-
tions. Alarm is just a warning. The system operation
is not impacted at all and alarm would clear when
Commissioning is exited.
E 331
E 347
Global network connection − Communication link problem.
For Future Use.
No 24 Volt output on Y1 to C with non−communicating outdoor unit.
Y1 relay / Stage 1 failed (Pilot relay contacts did not
close or the relay coil did not energize).
E 348
E 349
E 401
No 24 Volt output on Y2 to C with non−communicating outdoor unit.
Y2 relay / Stage 2 failed (Pilot relay contacts did not
close or the relay coil did not energize).
No 24 Volts between R & O with non−communicating outdoor unit (Dual
fuel module required for heat pump application).
Configuration link R to O needs to be cut on control
board.
LSOM − Compressor ran more than 18 hours in air conditioning mode.
Compressor protector is open. Check for high head
pressure, check compressor supply voltage. Out-
door unit power disconnect is open , compressor
circuit breaker or fuse(s) is open, broken wire or
connector is not making contact. Low or high pres-
sure switch open if present in the system. Compres-
sor contactor has failed to close.
E 402
E 403
E 404
E 405
LSOM − Outdoor unit system pressure trip.
LSOM − Compressor short−cycling (Running less than 4 minutes).
LSOM − Compressor rotor locked.
Compressor ran over 18 hours in air conditioning
mode.
Outdoor unit pressure trip. Check dirty coil, fan mo-
tor, refrigerant charge.
Compressor short cycling (Running less than 4 min-
utes).
LSOM − Compressor open circuit.
Check capacitor, wiring, hard start kit , replace com-
pressor.
E 406
E 407
E 408
E 409
LSOM − Compressor open start circuit.
LSOM − Compressor open run circuit.
LSOM − Compressor contactor is welded.
LSOM − Compressor low voltage.
Check compressor for hot (cool down) , check pres-
sures, fan motor etc. Replace compressor if unable
to get circuit to close and compressor to operate.
Replace contactor.
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Configuring Unit Size Code
Power−Up − Number displayed represents by integrated control unit size code (furnace model
and capacity). If three horizontal bars are displayed followed by continuous E203, furnace
control does not recognize unit size code. Configure per the following:
−
−
−
Furnace control in IDLE mode
No heating, cooling or indoor fan
operation)
No
Yes
To enter Field Test
Mode: push and hold
button
7−segment LED display
next
to
_
Turn room thermostat to OFF
until solid dash symbol
appears.
button.
Release
UNIT SIZE
CODE
If alarm is present,
furnace control will
display error code. If
alarm is not present solid
dash starts blinking on
7−segment LED display.
FURNACE MODEL
SLP98DFV−070−36B
SLP98DFV−090−36C
SLP98DFV−090−48C
SLP98DFV−090−60C
SLP98DFV−110−60C
_
H
J
L
n
o
Push and hold button until the solid P
symbol is displayed on the 7−segment
LED. Release button. This mode allows
the user to select a unit size code number
that matches the furnace model size and
capacity.
P
When the correct unit size code is displayed,
release button. Selected code will flash for
10−second period. During that period, hold push
button until code stops blinking (disappear for 2
seconds). Integrated control will store code in
memory and will automatically exit Field Test Mode
and reset. (If second period expires or push button
is held less than five seconds, control will
automatically exit Field Test Mode and go into
IDLE mode without storing unit size code. If this
happens, programming function must be repeated).
IMPORTANT: Field replacement controls may
need to be manually configured to validate
furnace unit size code.
Solid
blinking
P
starts
on
7−Segment LED
P
−
−
Verify that the selected unit size code is correct
and stored in non−volatile memory by cycling
−
the 24 volt power to the furnace control. (At 24
volt power−up of the furnace control, the
7−segment LED will display a unit size code. If
three horizontal bars display, board does not
recognize unit size code. Programming
function must be repeated)
Push and hold button. Integrated control will
display unit size code number for each
furnace model for five seconds.
FINISHED
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Troubleshooting: Heating Sequence of Operation
IGNITION AND CALL FOR LOW FIRE WITH TWO−STAGE
THERMOSTAT
1
Safety
Check
Verify There
Is No Main Burner
Flame
After
Indoor blower OFF
Heat OFF Delay
(Low Heat Speed)
YES
Limit
Switch
Closed?
Limit
Closes Within 3
Minutes?
Combustion Air
De−Energize
Gas Valve
Error Code
Flashes
Indoor Blower
ON (100%)
NO
NO
NO
NO
Inducer On
(100% rate
speed)
Indoor Blower OFF
After Heat OFF Delay
(High Heat Speed)
YES
Combustion
Air Inducer
On (100%
rate speed)
Soft Lockout:
Error Code
Flashes
Rollout
Circuit
Closed?
Rollout
Circuit
Closes?
YES
De−Energize
Gas Valve
Error Code
Flashes
1
Indoor Blower
ON (70%)
L
I
G
H
T
Combustion Air
Inducer OFF
After Post−Purge
NO
YES
High
Pressure
Switch
O
F
F
Low
Pressure
Switch
Open?
Error Code Flashes
After 5 Seconds
Error Code Flashes
After 5 Seconds
Indoor Blower OFF After
Heat OFF Delay
NO
Open?
High Pressure
Switch Opens
Low Pressure
Switch Opens
Hard Lockout:
Error Code
2
YES
Flashes
YES
Combustion Air
Inducer ON at 70%
Rate Speed
Call
For
NO
Heat?
NO
YES
YES
Low
4
Calibrations
Attempted?
Soft Lockout:
Error Code
Flashes
Call For
Heat
Ends?
Pressure Switch
Calibration
Calibration
Successful?
Pressure Switch
Closed Within 150
Seconds?
NO
NO
YES
NO
YES
Wait
5 minutes
YES
Pre−Purge
15 Seconds
Indoor
Blower
ON?
Interpurge
(15 Seconds)
Ignitor ON
20 Seconds
YES
NO
Gas Valve
Energized
C
A
L
Indoor blower OFF
After Heat OFF Delay
NO
L
Ignition Trial Begins
(Ignitor ON)
Indoor Blower Delay
Timer Started
F
O
R
1
1
S
T
Gas Valve
De−energized
Flame
Sensed Within
4 seconds?
5th
Unsuccessful
Trial?
Soft Lockout:
Error Code
Flashes
Combustion
Air Inducer
OFF
Post−Purge
(20Seconds)
NO
YES
S
T
1
Ignitor OFF
A
G
E
YES
H
E
A
T
Ignitor OFF
Wait For Ignition
Stabilization Delay
1
2
SOFT LOCKOUT IS RESET AUTOMATICALLY AFTER ONE HOUR WITH A CALL FOR HEAT ACTIVE,
OR BY CYCLING THE CALL FOR HEAT, OR BY CYCLING POWER TO THE CONTROL.
Set Target Firing Rate
Based on Thermostat
Signals Present
HARD LOCKOU T IS RESET BY CYCLING POWER TO THE CONTROL.
OR
2
3A
Call For 2nd Stage Heat
Call For Heat Satisfied
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Troubleshooting: Heating Sequence of Operation (Continued)
CALL FOR HIGH FIRE WITH TWO−STAGE THERMOSTAT
2
1
2 Stage
Thermostat
1st Call
for High
Fire?
YES
NO
2nd Stage
Recognition Delay
(30 Seconds)
Combustion Air Inducer ON
(100% Rate Speed)
High
Pressure Switch
Closes Within
10 Seconds?
Increase Combustion
Air Inducer Speed
if Not at 100%
Error Code
Flashes
Wait 5
Minutes
NO
Rate Speed
YES
Adjust Indoor
Blower to
Appropiate speed
Wait for Call for Heat Satisfied
3A
1
2
System will always light at 70% even if 2nd stage call for heat is in place
If the high pressure switch does not close within 5 attempts, the system
will operate at low fire for the remainder of the call for heat at request
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Troubleshooting: Heating Sequence of Operation (Continued)
CALL FOR HEAT SATISFIED
RUN MODE (TWO−STAGE THERMOSTAT)
FIRST OR SECOND−STAGE CALL FOR HEAT
ALL INPUTS MONITORED (LIMIT, PRESSURE,
CALL FOR HEAT/COOL, FLAME LEVEL).
RUN MODE (SINGLE−STAGE THERMOSTAT)
ALL INPUTS MONITORED (LIMIT, PRESSURE,
CALL FOR HEAT/COOL, FLAME LEVEL).
3A
3B
2nd Stage Heat
NO
2nd Stage
Call for Heat
satisfied?
YES
Combustion Air Inducer
switched to 70% rate speed
Adjust Indoor Blower
to appropiate speed
1st Stage Heat
NO
1st Stage
Call for Heat
satisfied?
YES
Gas valve
De−Energized
Combustion Air Inducer OFF
after 20−Second Post Purge
Indoor Blower OFF
after OFF Delay
OR
1
4
Wait for Call
Two−Stage
Thermostat
Wait for Call
Single−Stage
Thermostat
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Troubleshooting: Heating Sequence of Operation (Continued)
IGNITION AND CALL FOR HEAT WITH SINGLE−STAGE THERMOSTAT
4
Safety
Check
VerifyThere
Is No Main Burner
Flame
Indoor Blower OFF After
Heat OFF Delay
(Low Heat Speed)
YES
Indoor Blower
ON
(100% Speed)
Limit
Switch
Closed?
Limit
Closes Within 3
Minutes?
De−Energize
GasValve
Error Code
Flashes
Combustion Air
Inducer ON
(100%)
NO
NO
NO
NO
Indoor Blower OFF
After Heat OFF Delay
(High Heat Speed)
YES
Combustion Air
Inducer ON
(100%)
Soft Lockout:
Error Code
Flashes
Rollout
Circuit
Closed?
Rollout
Circuit
Closes?
De−Energize
GasValve
Error Code
Flashes
1
Indoor Blow-
er ON
(70%)
YES
L
I
G
H
T
NO
YES
Combustion Air Inducer
OFF After Post−Purge
O
F
F
Low
High
Indoor Blower OFF After
Heat OFF Delay
Error Code Flashes
After 5 Seconds
Error Code Flashes
After 5 Seconds
Pressure
Switch
Open?
Pressure
Switch
Open?
NO
High Pressure
Switch Opens
Low Pressure
Switch Opens
Hard Lockout:
Error Code
2
YES
Flashes
YES
Combustion Air Inducer ON
at Ignition at 70% rate speed
Call
For
NO
Heat?
NO
YES
YES
Low
Pressure Switch
Closed Within 150
Seconds?
4
Calibrations
Attempted?
Soft Lockout:
Error Code
Flashes
Call For
Heat
Ends?
Pressure Switch
Calibration
Calibration
Successful?
NO
NO
YES
NO
YES
Wait
5 minutes
YES
Pre−Purge
15 Seconds
Indoor
Blower On?
Ignitor ON
20 Seconds
Interpurge
(15 Seconds)
YES
NO
GasValve
Energized
Indoor Blower OFF
After Heat OFF Delay
NO
IgnitionTrial Begins
Ignitor ON
Indoor Blower On
Delay Timer Started
C
A
L
L
1
GasValve
De−energized
F
O
R
Flame
Sensed Within
4 seconds?
5th
Unsuccessful
Trial?
Soft Lockout:
Error Code
Flashes
Post−Purge
(20 Seconds)
Combustion Air
Inducer OFF
NO
YES
1
Ignitor OFF
H
E
A
T
YES
Ignitor OFF
Wait For Ignition
Stabilization Delay
1
2
SOFT LOCKOUT IS RESETAUTOMATICALLYAFTER ONE HOUR WITHA CALL FOR HEATACTIVE,
OR BY CYCLINGTHE CALL FOR HEAT, OR BY CYCLING POWERTO THE CONTROL.
HARD LOCKOUT IS RESET BY CYCLING POWERTO THE CONTROL.
Set to
Low Firing Rate
Move to Mid Firing Rate
and High Firing Rate after
2nd and 3rd Stage Delays
(based on DIP Switch selections)
Call For Heat Satisfied
3B
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Troubleshooting: Cooling Sequence of Operation
CALL FOR COOLING
5
1st Stage Cooling
Request Received
1
Energize 1st Stage
Cooling Contactor
(Compressor & Fan)
Indoor Blower On
After 2−second delay
Energize Indoor Blower
(Per Ramping Profile)
2
YES
1
1st Stage
Cooling Request
Still Active?
2nd Stage
Cooling
Request?
NO
YES
YES
Energize 2nd Stage
Cooling Contactor
(Compressor & Fan)
Energize Indoor Blower
(High Cooling mode)
2
NO
2nd Stage
Cooling Request YES
Still Active?
Maintain Indoor Blower
(High Cooling mode)
NO
De−Energize 2nd
Stage Cooling
Contactor
(Compressor & Fan)
1st Stage
Cooling Request
Still Active?
Energize and
Maintain Indoor Blower at
Low Cooling mode
YES
NO
De−Energize 1st
Stage Cooling
Contactor
(Compressor & Fan)
De−Energize Indoor Blower
Per Ramping Profile
2
2nd stage cooling operation requires a 2−stage thermostat, a 2−stage cooling system and
on−board link W915 must be be cut. The control will not respond to a 2nd stage cooling
request unless a 1st stage cooling request is active
1
2
Indoor blower cooling mode and high cooling mode have a specific ON, OFF and speed
ramping profiles. The specific profile is selected using the DIP switches on the control.
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Troubleshooting: Continuous Fan Sequence of Operation
CONTINUOUS LOW SPEED INDOOR BLOWER SEQUENCE OF OPERATION
6
Call for
Continuous Blower
Indoor Blower On
(Speed Determined by
Dip Switch settings)
Request
for Cooling
Received?
Maintain Indoor
Blower at set speed
YES
Go to Call for Cooling
5
NO
Go to Call for Heat −− Two−Stage Thermostat
1
OR
4
Request
for Heat
Received?
Maintain Indoor
Blower at set speed
YES
Go to Call for Heat −− Single−Stage Thermostat
NO
Call for Fan
Removed?
Maintain Indoor
Blower at set speed
NO
YES
Indoor blower low cooling mode and high cooling mode, have specific ON − OFF and speed
ramping profiles. The specific profile is selected using the dip switches on the control.
1
De−Energize
Indoor Blower Per
Ramping Profile
1
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Repair Parts List
The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model
number listed on the nameplate −− Example: SLP98DF070V36B. All service must be performed by a licensed profes-
sional installer (or equivalent), service agency, or gas supplier.
Cabinet Parts
Outer access panel
Heating Parts
Flame sensor
Blower access panel
Top cap
Heat exchanger assembly
Gas manifold
Control Panel Parts
Transformer
Combustion air inducer
Gas valve
Integrated control
Door interlock switch
Circuit breaker
Main burner cluster
Main burner orifices
Pressure switches
Ignitor
Blower Parts
Blower wheel
Motor
Primary limit control
Flame rollout switches
Motor mounting frame
Blower housing cut−off plate
Page 63
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Requirements for Commonwealth of Massachusetts
Modifications to NFPA−54, Chapter 10
4 − INSPECTION. The state or local gas inspector of the
side wall, horizontally vented, gas−fueled equipment
shall not approve the installation unless, upon inspec-
tion, the inspector observes carbon monoxide detec-
tors and signage installed in accordance with the pro-
visions of 248 CMR 5.08(2)(a) 1 through 4.
Revise NFPA−54 section 10.8.3 to add the following re-
quirements:
For all side wall, horizontally vented, gas−fueled equipment
installed in every dwelling, building or structure used in
whole or in part for residential purposes, including those
owned or operated by the Commonwealth and where the
side wall exhaust vent termination is less than seven (7)
feet above the finished grade in the area of the venting, in-
cluding but not limited to decks and porches, the following
requirements shall be satisfied:
EXEMPTIONS: The following equipment is exempt
from 24 CMR 5.08(2)(a) 1 through 4:
1 − The equipment listed in Chapter 10 entitled ꢂEquip-
ment Not Required to Be Vented" in the most current
edition of NFPA 54 as adopted by the Board; and
2 − Product Approved side wall, horizontally vented, gas−
fueled equipment installed in a room or structure sepa-
rate from the dwelling, building or structure used in
whole or in part for residential purposes.
1 − INSTALLATION OF CARBON MONOXIDE DETEC-
TORS. At the time of installation of the side wall, hori-
zontally vented, gas−fueled equipment, the installing
plumber or gasfitter shall observe that a hard−wired
carbon monoxide detector with an alarm and battery
backup is installed on the floor level where the gas
equipment is to be installed. In addition, the installing
plumber or gasfitter shall observe that a battery−oper-
ated or hard−wired carbon monoxide detector with an
alarm is installed on each additional level of the dwell-
ing, building or structure served by the side wall, hori-
zontally vented, gas−fueled equipment. It shall be the
responsibility of the property owner to secure the ser-
vices of qualified licensed professionals for the instal-
lation of hard−wired carbon monoxide detectors.
MANUFACTURER REQUIREMENTS −
GAS EQUIPMENT VENTING SYSTEM PROVIDED.
When the manufacturer of Product Approved side wall,
horizontally vented, gas−fueled equipment provides a vent-
ing system design or venting system components with the
equipment, the instructions provided by the manufacturer
for installation of the equipment and the venting system
shall include:
1 − Detailed instructions for the installation of the venting
system design or the venting system components:
and
a − In the event that the side wall, horizontally vented,
gas−fueled equipment is installed in a crawl space
or an attic, the hard−wired carbon monoxide detec-
tor with alarm and battery back−up may be installed
on the next adjacent floor level.
2 − A complete parts list for the venting system design or
venting system.
MANUFACTURER REQUIREMENTS −
GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED.
b − In the event that the requirements of this subdivi-
sion cannot be met at the time of completion of
installation, the owner shall have a period of thirty
(30) days to comply with the above requirements;
provided, however, that during said thirty (30) day
period, a battery−operated carbon monoxide detec-
tor with an alarm shall be installed.
When the manufacturer of Product Approved side wall,
horizontally vented, gas−fueled equipment does not pro-
vide the parts for venting the flue gases, but identifies ꢂspe-
cial venting systems," the following requirements shall be
satisfied by the manufacturer:
2 − APPROVED CARBON MONOXIDE DETECTORS.
Each carbon monoxide detector as required in accor-
dance with the above provisions shall comply with
NFPA 720 and be ANSI/UL 2034 listed and IAS certi-
fied.
1 − The referenced ꢂspecial venting system" instructions
shall be included with the appliance or equipment
installation instructions; and
2
The ꢂspecial venting systems" shall be Product Ap-
proved by the Board, and the instructions for that sys-
tem shall include a parts list and detailed installation
instructions.
3 − SIGNAGE. A metal or plastic identification plate shall
be permanently mounted to the exterior of the building
at a minimum height of eight (8) feet above grade di-
rectly in line with the exhaust vent terminal for the hori-
zontally vented, gas−fueled heating appliance or
equipment. The sign shall read, in print size no less
than one−half (1/2) inch in size, ꢂGAS VENT DIRECT-
LY BELOW. KEEP CLEAR OF ALL OBSTRUC-
TIONS."
A copy of all installation instructions for all Product
Approved side wall, horizontally vented, gas−fueled
equipment, all venting instructions, all parts lists for
venting instructions, and/or all venting design instruc-
tions shall remain with the appliance or equipment at
the completion of the installation.
Page 64
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