Lennox International Inc Air Conditioner 15GCSX User Manual

E 2005 Lennox Industries Inc.  
Dallas, Texas, USA  
15GCSX Series Units  
505,040M  
08/05  
Armstrong #38152A066  
WARNING  
Improper installation, adjustment, alteration,  
service or maintenance can cause property  
damage, personal injury or loss of life. Instal-  
lation and service must be performed by a  
qualified installer, service agency or the gas  
supplier  
READ ALL INSTRUCTIONS IN THIS MANUAL  
AND RETAIN FOR FUTURE REFERENCE  
Litho U.S.A.  
E2005  
WARNING  
FIRE OR EXPLOSION HAZARD.  
Failure to follow safety warnings exact-  
ly could result in serious injury, death,  
or property damage.  
WHAT TO DO IF YOU SMELL GAS:  
Do not store or use gasoline or other  
D Do not try to light any appliance.  
flammable vapors and liquids in the  
vicinity of this or any other ap-  
pliance.  
D Do not touch any electrical switch; do not  
use any phone in your building.  
D Leave the building immediately.  
D Immediately call your gas supplier from a  
neighbor’s phone. Follow the gas supplier’s  
instructions.  
Installation and service must be  
performed by a qualified installer,  
service agency or the gas supplier.  
D If you cannot reach your gas supplier, call  
the fire department.  
08/05  
505,040M  
*2P0805*  
*P505040M*  
 
4 − Turn the gas valve knob to the ON position. Refer to  
WARNING  
5 − Replace heat section access panel.  
6 − Turn on electrical power to unit.  
7 − Set room thermostat to desired temperature. (If ther-  
mostat setpoint temperature is above room tempera-  
ture after the pre−purge time expires, main burners  
will light).  
Do not use this unit if any part has been under wa-  
ter. A flood−damaged unit is extremely dangerous.  
Attempts to use the unit can result in fire or explo-  
sion. A qualified service agency should be con-  
tacted to inspect the unit and to replace all gas  
controls, control system parts, electrical parts that  
have been wet orto replace the unit if deemed nec-  
essary.  
Honeywell VR8205 Series Gas Valve  
Unit Operation  
WARNING  
Danger of explosion and fire. Can  
cause injury or product or property  
damage. You must follow these  
instructions exactly.  
GAS VALVE SHOWN IN OFF POSITION  
Figure 2  
FOR YOUR SAFETY READ BEFORE LIGHTING  
To Shut Down:  
BEFORE LIGHTING smell all around the unit area for  
gas. Be sure to smell next to the floor because some gas  
is heavier than air and will settle on the floor.  
1 − Set the thermostat to the lowest setting.  
2 − Turn off electric power to unit.  
3 − Remove heat section access panel.  
4 − Turn the gas valve knob to the OFF position.  
5 − Replace heat section access panel.  
Use only your hand to turn the gas control knob. Never  
use tools. If the knob will not turn by hand, do not try to  
repair it, call a qualified service technician. Force or at-  
tempted repair may result in a fire or explosion.  
WARNING  
Danger of explosion. Can cause injury  
or death. Do not attempt to light  
manually. Unit has a direct spark  
ignition system.  
This unit is equipped with an automatic spark ignition sys-  
tem. There is no pilot. In case of a safety shutdown, move  
thermostat switch to OFF and return the thermostat  
switch to HEAT. An electro−mechanical thermostat is  
controls, shut main disconnect off and back on to reset  
ignition control.  
Thermostat Operation  
There are many styles of thermostats. Though their ap-  
pearances may be different, there are many similarities.  
System Switch  
THERMOSTAT  
HEAT  
COOL  
The thermostat system switch allows you to choose  
whether you wish the unit to operate in either the HEAT or  
COOL mode. When the HEAT mode is selected, the unit  
will operate to satisfy a heating demand. When the COOL  
mode is selected, the unit will operate to satisfy a cooling  
demand. Some thermostats feature an AUTO system  
mode, which automatically switches between the HEAT  
and COOL modes to ensure comfort.  
50 60 70 80  
10 15 2025 30  
FAN  
AUTO ON  
HEAT  
COOL  
OFF  
Fan Operation  
Figure 1  
The thermostat fan switch allows you to choose whether  
you wish the circulating air blower to operate in either the  
AUTO or ON mode. When the AUTO mode is selected,  
the circulating air blower will cycle on and off with the cool-  
ing or heating demand. When the ON mode is selected,  
the circulating air blower will operate continuously.  
To Place Unit into Operation:  
1 − Turn off electrical power to unit.  
2 − Set thermostat to lowest setting.  
3 − Remove heat section access panel.  
Page 2  
 
 
Distorted flame or yellow tipping of the natural gas  
flame (or long yellow tips on LP/propane flame) may be  
caused by one or more of the following: lint or dirt inside  
the burner or burner ports; lint or dirt at the air inlet be-  
tween the burner and manifold pipe; or an obstruction  
over the burner orifice.  
Maintenance  
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.  
Use a soft brush or vacuum to clean the affected areas.  
WARNING  
Typical Flame Appearance  
Heat Exchanger  
Electric shock hazard. Can cause  
injury or death. Before attempting to  
perform any service or maintenance,  
turn the electrical power to unit OFF at  
disconnect switch(es). Unit may have  
multiple power supplies.  
Burner  
Filters  
Filter(s) must be installed in the return air system. Filters  
should be checked monthly and replaced when neces-  
sary. Take note of air flow direction marking on filter frame  
when reinstalling filters. Replace disposable or clean per-  
manent type as necessary. DO NOT replace permanent  
type with disposable.  
Burner  
Flame  
(Blue Only)  
Gas Manifold  
Figure 3  
Vent Outlet  
NOTE − Filters must be U.L.C. approved or equivalent for  
use in Canada.  
Visually inspect vent outlet periodically to make sure that  
the there is no buildup of soot and dirt . If necessary, clean  
to maintain adequate opening to discharge flue products.  
Motors  
All motors are permanently lubricated and require no  
further lubrication. Motors should be cleaned yearly to  
prevent the accumulation of dust and dirt on the windings  
or motor exterior.  
Service Reminder  
Call a qualified service technician if the unit is inopera-  
tive. Before calling, always check the following to be  
sure service is required:  
Coil  
Dirt and debris should not be allowed to accumulate on  
the coil surfaces or other parts in the air conditioning cir-  
cuit. Cleaning should be performed as often as neces-  
sary. Use a brush, vacuum cleaner attachment, or other  
suitable means. If water is used to clean the coil, be sure  
the power to unit is shut off prior to cleaning.  
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.  
5 − Air filters should not be plugged, limiting air flow.  
6 − Make sure all access panels are in place.  
NOTE − Care should be used when cleaning the coil so  
that the coil fins are not damaged.  
Repair Parts List  
Do not permit the hot condenser air discharge to be ob-  
structed by overhanging structures or shrubs.  
The following repair parts are available through Lennox  
dealers. When ordering parts, include the complete unit  
model number listed on the unit rating plate.  
Burners  
CONTROL PANEL PARTS HEATING PARTS  
Ignition control board  
Contactor  
Transformer  
Heat exchanger assembly  
Combustion air inducer  
Orifices  
Burners  
Gas valve  
Manifold  
Ignitor  
Limit control  
Rollout switch  
Pressure switch  
WARNING  
Danger of explosion and fire. Can cause  
injury or product or property damage.  
Periodically inspect burner flame to en-  
sure proper unit operation.  
Capacitor  
BLOWER PARTS  
Blower wheel  
Blower Motor  
Motor mounting arm  
Blower housing  
COOLING PARTS  
Compressor  
Condenser fan motor/blades  
Coils  
Drain pan  
Inspect the burner flame periodically during heating sea-  
son to ensure proper burner operation.  
Light the burners and allow unit to operate for a few min-  
utes to establish normal burning conditions. Observe the  
burner flames. Flames should be predominantly blue in  
color and strong in appearance. Verify that all burners  
are lit and that the flame does not impinge on the sides of  
the heat exchanger. See figure 3.  
Page 3  
 
 

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