Lennox 15GCSX Series Guide

,t_2005 Lennox Industries Inc,
Dallas, Texas, USA
505,040M
08/05
Armstrong #38152A066
15GCSX Series Units
AWARNING
READ ALL INSTRUCTIONS IN THIS MANUAL
AND RETAIN FOR FUTURE REFERENCE
-_ppuTeChnical
blications
Litho U.S.A.
'_c_2005
COBS AWARNING GAS-FIRED COBS
LISTED
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other ap-
pliance.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
•Do not touch any electrical switch; do not
use any phone in your building.
•Leave the building immediately.
•Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
•If you cannot reach your gas supplier, call
the fire department.
08/05
Illlllllllllllllllllllllllllllllllllllll 505,040M Illlllllllllllllllllllllllllllllllllllllllllll

COIL
MOTOR
CONTROL
SECTION
PRESSURE
COItBRRTI(
AIR INDUCER
BURNER
FAN
COiL
1 - Keep unit area clear and free of combustible materi-
als, gasoline and other flammable vapors and liquids.
2 - Inspect return air duct to ensure duct is sealed to
the unit and terminates outside the space contain-
ing appliance.
3 - This unit requires air for combustion and ventilation
to ensure both proper and safe operation. Combus-
tion air is brought in through the condenser section.
Do not block or obstruct the condenser coil or con-
denser fan opening.
4 - Examine the unit periodically to ensure that the physi-
cal support of the unit is sound without sagging,
cracks, gaps, etc. There must be no obvious signs of
deterioration of the unit.
AWARNING
`&WARNING
`&WARNING
`&WARNING
,&WARNING
Page 1

WARNING
kWARNING
FOR YOUR SAFETY READ BEFORE LIGHTING
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.
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,
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
shown in figure 1, On units with electronic temperature
controls, shut main disconnect off and back on to reset
ignition control,
THERMOSTAT
50 60 70 80
10 15 202530
_\\\-\\/\-III1'////-////
[_Z3
AWOOTI I I \_
FAN ON HEAT OFF COOL
Figure 1
To Place Unit into Operation:
1 - Turn off electrical power to unit.
2 - Set thermostat to lowest setting,
3 - Remove heat section access panel.
4 - Turn the gas valve knob to the ON position, Refer to
figure 2.
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).
Honeywell VR8205 Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
Figure 2
To Shut Down:
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,
&WARNING
There are many styles of thermostats. Though their ap-
pearances may be different, there are many similarities,
System Switch
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,
Fan Operation
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,
Page 2

Tomaintainefficiencyandlongevity,yourequipment
mustbeservicedyearlybyaqualifiedservicetechnician.
Failureto provideproofofproperservicecanvoidthe
warranty. AWARNING
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,
NOTE -Filters must be U,L,C, approved or equivalent for
use in Canada,
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.
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.
NOTE - Care should be used when cleaning the coil so
that the coil fins are not damaged.
Do not permit the hot condenser air discharge to be ob-
structed by overhanging structures or shrubs.
Burners
,WARNING
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.
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,
Use a soft brush or vacuum to clean the affected areas.
Typical Flame Appearance
Heat Exchanger
Burner /
Gas Manifold Burner
Flame
(Blue Only)
Figure 3
Vent Outlet
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.
Call a qualified service technician if the unit is inopera-
tive. Before calling, always check the following to be
sure service is required:
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.
The following repair parts are available through Lennox
dealers. When ordering parts, include the complete unit
model number listed on the unit rating plate,
CONTROL PANEL PARTS
Ignition control board
Contactor
Transformer
Capacitor
BLOWER PARTS
Blower wheel
Blower Motor
Motor mounting arm
Blower housing
COOLING PARTS
Compressor
Condenser fan motor/blades
Coils
Drain pan
HEATING PARTS
Heat exchanger assembly
Combustion air inducer
Orifices
Burners
Gas valve
Manifold
Ignitor
Limit control
Rollout switch
Pressure switch
Page 3