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4 - DO NOT draw the return air from a room where
another gas appliance (ie., a water heater) is
installed. Even though this furnace draws its com-
bustion air from outside of the structure, other gas
appliances that share a utility room may not. When
return air is drawn from a room, a negative pressure
is created in the room. If a gas appliance is operating
in a room with negative pressure, the 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 distrib-
uted through the house by the furnace duct system.
Your furnace is a gas appliance. It is critical that the gas
supplied to the unit be completely burned to avoid the pro-
duction of carbon monoxide gas. Complete combustion
of the gas requires, but is not limited to, correct gas pres-
sure and gas flow rate, adequate combustion, air, and
proper venting.
WARNING
Carbon monoxide gas is invisible, odorless, and
toxic.
Exposure to this gas can cause personal injury and even
death to all occupants, including pets. Any item that is pow-
ered by or gives off heat from a combustion process (in-
cluding 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 reason-
able retail prices. Contact your independent 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 satisfactory operation of the
product. Lennox strongly recommends annual in-
spection and maintenance of this appliance. Contact
your independent Lennox dealer for an inspection by a
qualified service technician.
81,7 23(5$7,21
This appliance does not have a pilot. It is equipped
with an ignition system which automatically lights
the burner. Do not try to light by hand.
A-Gas Valve Operation
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or loss of life.
Gas Valve Operation for Robertshaw and White
Rodgers Valves (Figures 2 and 5)
FIGURE 2
ROBERTSHAW 7200 GAS VALVE
GAS VALVE
SELECTOR ARM
IN OFF
POSITION
WHITE RODGERS
36E GAS VALVE
GAS VALVE
SHOWN
IN OFF
POSITION
1- Set thermostat to lowest setting. See figure 3.
2- Turn off all electrical power to furnace. See figure 4.
3- This appliance Is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
4- Remove unit access panel.
5- On Robertshaw 7200 gas valve, depress lever on
gas control and move to OFF and release. For
White Rodgers 36E gas valves, move switch to OFF.
Do not force.
6- Wait five (5) minutes to clear out any gas. Smell for
gas, including near the floor. 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.
Summary of Contents for GSR21Q Series
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