Dallas, Texas
503,073M
9/98
Supersedes 6/96
GSR21Q & V
SERIES
GAS
FURNACE
Litho U.S.A.
:$51,1*
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury, or death.
WHAT TO DO IF YOU SMELL GAS:
- Do not try to light any appliance.
- Extinguish any open flames.
- Do not touch any electrical switch; do not
use any phone in your building.
- Immediately call your gas supplier from a
neighbor’s phone. Follow the gas suppli-
er’s instructions.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must be per-
formed by a qualified installer, ser-
vice agency or the gas supplier.
- If you cannot reach your gas supplier, call
the fire department.
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.
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)
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.
GAS VALVE
SELECTOR ARM
IN OFF
POSITION
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.
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.
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.
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.
GAS PIPING
DOWNFLOW APPLICATION
GAS PIPING
HORIZONTAL APPLICATION
7- On Robertshaw 7200 gas valve, depress lever on
gas control and move to ON and release. For White
Rodgers 36E gas valves, move switch to ON.
8- Replace unit access panel.
9- Turn on all electrical power to unit.
10- Set thermostat to desired setting. See figure 3.
*Gas connector may be
11- If the furnace will not operate, follow the instructions
“To Turn Off Gas To Unit” and call your service techni-
cian or gas supplier.
used for Canadian
installationif acceptable
by localauthority having
jurisdiction.
B-To Turn Off Gas To Unit
1- Set thermostat to lowest setting. See figure 3.
2- Turn off all electrical power to unit if service is to be
performed. See figure 4.
Inspect and clean air filters each month. Filters must
be cleaned when dirty to assure proper furnace op-
eration and maintain efficiency.
3- Remove heat section access panel.
A-Cleaning Reusable Foam Filter
4- 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.
1- Turn off electrical power to furnace.
2- Remove blower access panel. Wait for blower to stop.
3- Remove filter by sliding up and out of channel.
5- Replace unit access panel.
4- Wash filter with water and a mild detergent. For in-
creased efficiency, filter media should be sprayed
with Filter Handicoater when dry. Filter Handicoater
is RP products No. 418 and is available as Lennox
part No. P-8-5069. If replacement filters is needed,
use Lennox part no. P-8-7831 for 20” x 25” (508 x
635mm) filter.
FOR UNIT TO
OPERATE DISCONNECT
SWITCH MUST
BE IN “ON” POSITION
TYPICAL
5- Reinstall filter. Slide filter into top channel and drop
into lower channel.
FUSE/DISCONNECT
SWITCH BOX MOUNTED
ON FURNACE
IMPORTANT-Do not replace foam reusable filters
with throw-away type filters.
6- Replace blower access panel.
If you smell any unusual odors, your unit may be oper-
ating improperly. For example, units can give off unfa-
miliar odors if components are required to operate in
abnormal conditions.
Motors are pre-lubricated for extended bearing life;
no further lubrication is required.
Look for visible signs of a malfunctioning unit. Exam-
ples include unusual amounts of condensate on win-
dows inside your house, visibly burnt components or
unusual dirt or rust accumulations on the vent pipe or
in the unit.
At the beginning of each heating season, the system
should be checked as follows:
1- Examine the termination ends of the intake and ex-
haust lines for obstructions or blockages.
If you experience headache, nausea, fatigue, or dizzi-
ness, the cause could be exposure to carbon monox-
ide gas. This is often misdiagnosed as the flu because
symptoms are similar. If you suffer from flu-like symp-
toms that are exaggerated at home, but seem to sub-
side while you are away from the house, exposure to
carbon monoxide could be the cause.
2- Check the intake and exhaust lines for holes, sag-
ging or broken isolation hangers. If a sag is found in
either line, raise the line and support it with an isola-
tion hanger. Replace any damaged isolation hang-
ers.
Your vigilance may pay off in early detection of a problem
before either personal injury or property damage occurs.
Do not hesitate to contact a qualifiedservice technicianas
an investment in your well being.
3- The return air duct connection should be sealed to
the furnace casing and terminate outside the space
containing the furnace.
4- Check the physical support of the furnace. It should
be sound without sagging, cracks, gaps, etc., around
the base so as to provide a seal between the support
and the base.
You should expect a service technician to check the following
items during an annual inspection. Power to the unit must be
shut off for the service technician’s safety.
5- Check that there is no obvious signs of deterioration
of the furnace.
Fresh air grilles and louvers (on the unit and in the room
where the furnace is installed) - Must be open and unob-
structed to provide combustion air.
6- Inspect and clean condensate drain system for free
flow of condensate.
IMPORTANT-If a change in the sound level of the unit
is detected or there is evidence of condensate leak-
age around the unit, contact your Lennox service
technician.
Burners- Must be inspected for rust, dirt, or signs of water.
Vent pipe - Must be inspected for dirt, signs of water, dam-
aged or sagging unsupported pipe, or disconnected joints.
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 provide
a seal between the return air and the room where the furnace
is installed.
Call your Lennox service technician if the unit is inop-
erative. Before calling, always check the following to
be sure service is required:
Return air duct - Must be properly attached and provide an
airtight seal to the unit.
1- Be sure electrical switches are ON.
2- Check the room thermostat for proper setting.
3- Replace any blown fuses or reset circuit breakers.
4- Make sure gas valve is on.
Operating performance - Unit must be observed during op-
eration to monitor proper performance of the unit and the
vent system.
Combustion gases - Flue products must be analyzed and
compared to the unit specifications.
5- Blower access panel is in place.
6- Air filter must be clean.
Problems detected during the inspection may make it neces-
sary to temporarily shut down the furnace until the items can
be repaired or replaced.
If you discover any of the following, shut down your
unit, and contact an independent Lennox dealer for
an inspection by a qualified technician.
Pay attention to your furnace. Situations can arise be-
tween annual furnace inspections that may result in unsafe
operation. For instance, items innocently stored next to the
furnace may obstruct the combustion air supply. This could
cause incomplete combustion and the production of carbon
monoxide gas.
If you repeatedly hear any new or unfamiliar sounds
while your unit is operating, there may be a problem.
For example, poorly performing burners can produce
unfamiliar noises.
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