Lennox International Inc Furnace GCS16 024 User Manual

See unit nameplate for manufacturer  
and address.  
504,558M  
8/2002  
Supersedes 2/2002  
GCS16−024, 030, 036, 048, 060  
GCS20−024, 030, 036, 048, 060  
GCS20R−024, 030, 036, 042, 048, 060  
WARNING  
Improper installation, adjustment, alteration, serꢀ  
vice or maintenance can cause property damage,  
personal injury or loss of life. Installation and serꢀ  
vice must be performed by a qualified installer, serꢀ  
vice agency or the gas supplier  
READ ALL INSTRUCTIONS IN THIS MANUAL  
AND RETAIN FOR FUTURE REFERENCE  
Litho U.S.A.  
E2002  
FBR113270  
WARNING  
If the information in this manual is not  
followed exactly, a fire or explosion  
may result causing property damage,  
personal injury or loss of life.  
WHAT TO DO IF YOU SMELL GAS:  
S Do not try to light any appliance.  
S Extinguish any open flames.  
Do not store or use gasoline or other  
flammable vapors and liquids in the  
vicinity of this or any other appliance.  
S Do not touch any electrical switch; do not  
use any phone in your building.  
S Leave the building immediately.  
S Immediately call your gas supplier from a  
neighbor’s phone. Follow the gas suppliꢀ  
er’s instructions.  
Installation and service must be perꢀ  
formed by a qualified installer, serꢀ  
vice agency or the gas supplier.  
S If you cannot reach your gas supplier, call  
the fire department.  
08/02  
504,558M  
*2P0802*  
*P504558M*  
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4− Remove heat access panel.  
5− Honeywell VR8205 − Turn knob on gas valve clockꢀ  
WARNING  
Danger of electrical shock, explosion  
and fire. Improper servicing could  
result in dangerous operation, serious  
inujry, death or property damage.  
wise  
wise  
until it stops. Depress knob and turn clockꢀ  
to OFF.  
White Rodgers 36E − Turn knob on gas valve 180° eiꢀ  
ther way to OFF.  
6− Wait five minutes to clear out any gas. If you then  
smell gas, STOP! Immediately call your gas supplier  
from your neighbor’s phone. Follow the gas supplier’s  
instructions. If you don’t smell gas go to next step.  
Unit Operation  
FOR YOUR SAFETY READ BEFORE LIGHTING  
BEFORE LIGHTING smell all around the furnace area for  
gas. Be sure to smell next to the floor because some gas  
is heavier than air and will settle on the floor.  
Gas Valve Operation (Figure 2)  
7− Honeywell VR8205 − Turn knob on gas valve counterꢀ  
Use only your hand to push in or turn the gas control  
knob. Never use tools. If the knob will not push in or turn  
by hand, do not try to repair it, call a qualified service  
technician. Force or attempted repair may result in a fire  
or explosion.  
clockwise  
until it stops. Allow knob to pop up and  
continue counterclockwise to ON position.  
White Rodgers 36E − Turn knob on valve 180° either  
way to ON.  
8− Replace heat section access panel.  
This unit is equipped with an automatic spark ignition sysꢀ  
tem. There is no pilot. In case of a safety shutdown, move  
thermostat switch to OFF and return the thermostat  
switch to HEAT. Electro−mechanical thermostat is shown  
in figure 1. On logic units and units with electronic temperꢀ  
ature controls, shut main disconnect off and back on to reꢀ  
set ignition control.  
9− Turn on electrical power to unit. If using electroꢀmeꢀ  
chanical thermostat, set to desired setting.  
10− The combustion air inducer(s) will start. The burners  
will light within 40 seconds.  
HONEYWELL VR8205 SERIES GAS VALVE  
Unit Operation − Continued  
THERMOSTAT  
HEAT  
COOL  
ON  
50 60 70 80  
10 15 2025 30  
OFF  
GAS VALVE SHOWN IN OFF POSITION  
WHITE RODGERS 36E GAS VALVE  
FAN  
AUTO ON  
HEAT  
COOL  
OFF  
MANIFOLD  
PRESSURE  
ADJUSTMENT  
SCREW  
FIGURE 1  
A−Placing Unit In Heating Operation  
MANIFOLD  
PRESSURE  
OUTLET  
NO  
WARNING  
OFF  
Danger of explosion and fire. Can  
cause injury or product or property  
damage. You must follow these  
instructions exactly.  
FIGURE 2  
11− If unit does not light first time (gas line not fully  
purged) it will attempt up to two more ignitions before  
locking out.  
1− If using electroꢀmechanical thermostat, set to the lowꢀ  
est setting.  
2− Turn off all electrical power to furnace.  
12− If lockout occurs, repeat steps 1 through 10.  
3− This furnace is equipped with an ignition device which  
automatically lights burner. Do not try to light burner  
by hand.  
13− If the furnace will not operate, follow the instructions  
To Turn Off Gas To Unit" and call your service techniꢀ  
cian or gas supplier.  
Page 2  
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B−To Turn Off Gas To Unit  
The primary air is permanently set for normal operation.  
The flame will be basically blue with some clear yellow  
streaking in the end of the flame. Inspect burner flame peꢀ  
riodically during heating season using inspection port  
provided on the burner access panel.  
1− If using electroꢀmechanical thermostat, set to the lowꢀ  
est setting.  
2− Turn off all electrical power to unit if service is to be  
performed.  
3− Remove heat section access panel.  
Service  
4Turn knob on Honeywell gas valve clockwise  
it stops. Depress knob and turn clockwise  
until  
to OFF.  
To maintain efficiency and longevity, your equipment  
must be serviced yearly by a qualified service technician.  
Failure to provide proof of proper service can void the  
warranty.  
Turn knob on White Rodgers 180° either way to off.  
Do not force.  
5− Replace heat section access panel.  
A−Servicing Filter  
Filters must be installed in the return air system. Filters  
should be checked monthly and replaced when necesꢀ  
sary. Take note of air flow direction marking on filter frame  
when reinstalling filters.  
WARNING  
Danger of explosion. Can cause injury  
or death. Do not attempt to light  
manually. Unit has a direct spark  
ignition system.  
NOTE−Filters must be U.L.C. approved or equivalent for  
use in Canada.  
B−Lubrication  
Flue Passage and Vent Inspection  
All motors are lubricated at the factory. No further lubricaꢀ  
tion is required.  
Annually, before heating season, inspect combustion air  
louvers, vent cap, heat exchanger, burners and combusꢀ  
tion air inducer for corrosion, deterioration or deposits of  
debris. Remove any obstructions or blockage.  
Service Reminder  
Call a qualified service technician if the unit is inoperaꢀ  
tive. Before calling, always check the following to be  
sure service is required:  
Burner Flame  
1− Be sure electrical disconnect switches are ON.  
2− Check room thermostat for proper setting.  
3− Replace any blown fuses or reset circuit breakers.  
4− Gas valve should be ON.  
WARNING  
Danger of explosion and fire. Can cause  
injury or product or property damage.  
Periodically inspect burner flame to enꢀ  
sure proper unit operation.  
5− Air filters should not be plugged, limiting air flow.  
6− Make sure all access panels are in place.  
Repair Parts Listing  
The following repair parts are available. When ordering parts, include the complete model number and serial number  
listed on the unit rating plate − e.g. GCS20−024−50−1P  
HEATING PARTS  
COOLING PARTS  
ELECTRICAL PARTS  
Heat Exchanger  
Compressor  
Compressor Contactor (K1)  
Blower Relay (K3)  
Combustion Air Inducer Assembly  
Burner Sub−Assembly  
Combustion Air Orifice  
Gas Orifices  
Compressor Run Capacitor  
Expansion Valve  
Blower Limit Relay (K20)  
Combustion Air Inducer  
Relay (K13)  
Condenser Fan Motor  
Condenser Fan Blade  
Condenser Fan Run Capacitor  
Condenser Fan Motor Mounting Bracket  
Fan Grille  
Ignition Electrode Assembly  
Flame Sensor  
Control Transformer  
Ignition Control  
Burner Gasket  
Blower Delay Relay (K25 )  
Gas Valve  
Grille Retaining Nut  
Indoor Blower Motor  
Blower Motor Run Capacitor  
Blower Wheel  
Limit Control  
Flue Cap  
Vent Cap Gasket  
Secondary Limit  
Strainer  
Roll−Out Switch  
Distributor  
Combustion Air Inducer Gaskets  
Time Delay  
Page 3  
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