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SLP99DFV Gas Furnace
The SLP99DFV category IV gas furnace is equipped with
a variable-capacity, variable-speed integrated control.
This control ensures compatibility with the Lennox com-
mincating thermostat and iHarmony
as well as a thermostat which provides humidity control.
The furnace is equipped for installation in natural gas ap-
plications only. A changeover kit may be ordered for LP
applications.
The SLP99DFV must be installed only as a Direct Vent
gas central furnace.
NOTE - In Direct Vent installations, combustion air is tak-
en from outdoors and flue gases are discharged outdoors.
See FIGURE 2 for applications including roof termination.
DIRECT VENT INSTALLATION
COMBUSTION
AIR INTAKE
OUTSIDE OF
HOUSE
FIGURE 2
Shipping and Packing List
Package 1 of 1 contains
1 - Assembled SLP99DFV unit
1 - Bag assembly containing the following:
1 - Snap bushing
1 - Snap plug
1 - Wire tie
1 - Condensate trap
1 - 3/4" Threaded street elbow
1 - Flue Coupling
2 - 2" Street elbows
2 - Side vent sealing plates
2 - Side vent sealing gaskets
6 - Sheet metal screws
1 - Bag containing discharge air sensor
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
zone control system,
®
EXHAUST OUTLET
Safety Information
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
Use only the type of gas approved for use with this fur-
nace. Refer to unit nameplate.
Building Codes
In the USA, installation of gas furnaces must conform with
local building codes. In the absence of local codes, units
must be installed according to the current National Fuel
Gas Code (ANSI-Z223.1/NFPA 54). The National Fuel
Gas Code is available from the following address:
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.
This furnace is designed for installation clearances to
combustible material as listed on the unit nameplate and
the table in FIGURE 7. Accessibility and service clearanc-
es must take precedence over fire protection clearances.
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 a public garage, hangar, or other building that has a
hazardous atmosphere, the furnace must be installed ac-
cording to recommended good practice requirements and
current National Fuel Gas Code or CSA B149 standard.
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 ex-
changer failure. See Duct System section on page 9 for
installing the optional discharge air sensor used to mea-
sure temperature rise. The sensor is shipped with the unit.
This SLP99DFV furnace must be installed so that its elec-
trical components are protected from water.
Page 4
WARNING
CAUTION
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