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Exposure to carbon monoxide gas can cause personal inju-
ry and even death to all occupants, including pets. Any item
that is powered by, or gives off heat from, a combustion pro-
cess (including lawn mowers, automobiles, and fireplaces)
has the potential to produce carbon monoxide gas. Because
of this,
Lennox recommends the use of a carbon monox-
ide detector in your home, even if you do not own gas
appliances.
Reliable detectors are available at reasonable
retail prices. Contact your Lennox dealer for more details
about this investment in your safety.
Your furnace is designed to meet standards set by nation-
al agencies, and to operate safely when properly installed
and maintained. However, the unit’s performance can be
greatly impacted by the individual installation and the op-
erating environment. It is your responsibility to ensure that
this appliance is maintained.
Proper maintenance is critical for your safety and the sat-
isfactory operation of the product.
Lennox strongly rec-
ommends annual inspection and maintenance of this
appliance.
Contact your Lennox dealer for an inspection
by a licensed professional service technician.
DANGER
Danger of explosion.
There are circumstances in which odorant used with
LP/propane gas can lose its scent. In case of a leak,
LP/propane gas will settle close to the floor and may
be difficult to smell. An LP/propane leak detector
should be installed in all LP applications.
Do not attempt to bleed the gas lines of air. Call your
local gas provider.
Start−Up & Operation Information
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
BEFORE LIGHTING
smell all around the appliance area
for gas. Be sure to smell next to the floor because some gas
is heavier than air and will settle on the floor.
The gas valve on the SL280DFV is equipped with a gas
control switch. Use only your hand to turn the gas control
switch. Never use tools. If the switch will not move by
hand, do not try to repair it. Call a licensed professional
service technician (or equivalent). Force or attempted re-
pair may result in a fire or explosion.
Placing the SL280DFV furnace into operation:
SL280DFV units are equipped with a SureLight
®
ignition
system. Do
not
attempt to manually light burners on these
furnaces. Each time the thermostat calls for heat, the burn-
ers will automatically light. The ignitor does not get hot
when there is no call for heat on units with the SureLight
®
ignition system.
Operating the Gas Valve (Figures 2 and 3)
1 −
STOP
! Read the safety information at the beginning of
this section.
2 − Set the thermostat to the lowest setting.
3 − Turn off all electrical power to the unit.
4 − This furnace is equipped with an ignition device which
automatically lights the burners. Do
not
try to light the
burners by hand.
5 − Remove the upper access panel.
6 − Move switch on gas valve to
OFF
. Do not force. See
7 − Wait five minutes to clear out any gas. If you then smell
gas,
STOP
! Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s instruc-
tions. If you do not smell gas go to next step.
8 − Move switch on gas valve to
ON
. Do not force. See fig-
9 − Replace the upper access panel.
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.
12 − If the appliance will not operate, follow the instructions
Turning Off Gas to the Unit" and call your service tech-
nician or gas supplier.
GAS VALVE SHOWN IN OFF POSITION
FIGURE 2
WHITE RODGERS GAS VALVE
GAS VALVE SHOWN IN ON POSITION
HONEYWELL GAS VALVE
FIGURE 3
