Lennox International Inc. GCS16-024 - Manual (Page 3)

Page 2
WARNING
Danger of electrical shock, explosion
and fire. Improper servicing could
result in dangerous operation, serious
inujry, death or property damage.
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.
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.
This unit is equipped with an automatic spark ignition sysĆ
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 temperĆ
ature controls, shut main disconnect off and back on to reĆ
set ignition control.
Unit Operation − Continued
THERMOSTAT
FIGURE 1
HEAT COOL
FAN
50 60 70 80
10 15 2025 30
HEAT OFF COOL AUTO ON
A−Placing Unit In Heating Operation
WARNING
Danger of explosion and fire. Can
cause injury or product or property
damage. You must follow these
instructions exactly.
1− If using electroĆmechanical thermostat, set to the lowĆ
est setting.
2− Turn off all electrical power to furnace.
3− This furnace is equipped with an ignition device which
automatically lights burner. Do not try to light burner
by hand.
4− Remove heat access panel.
5− Honeywell VR8205 − Turn knob on gas valve clockĆ
wise until it stops. Depress knob and turn clockĆ
wise to OFF.
White Rodgers 36E − Turn knob on gas valve 180° eiĆ
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.
Gas Valve Operation (Figure 2)
7− Honeywell VR8205 − Turn knob on gas valve counterĆ
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.
9− Turn on electrical power to unit. If using electroĆmeĆ
chanical thermostat, set to desired setting.
10− The combustion air inducer(s) will start. The burners
will light within 40 seconds.
FIGURE 2
HONEYWELL VR8205 SERIES GAS VALVE
ON
OFF
GAS VALVE SHOWN IN OFF POSITION
WHITE RODGERS 36E GAS VALVE
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
MANIFOLD
PRESSURE
OUTLET
NO
OFF
11− If unit does not light first time (gas line not fully
purged) it will attempt up to two more ignitions before
locking out.
12− If lockout occurs, repeat steps 1 through 10.
13− If the furnace will not operate, follow the instructions
To Turn Off Gas To Unit" and call your service techniĆ
cian or gas supplier.