Lennox International Inc Furnace GSR21Q User Manual

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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