Lennox B050A3B, Installation/Servicing Instructions And Users Information Manual

Page: 31 / 36

506307-01 Page 31 of 36 Issue 1207
Figure M-1
Gas Valves
Honeywell
Single Stage
Alternate Lever
Switch
To Turn Off Gas to Furnace
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the furnace if service is to
be performed.
3. Remove the burner compartment access panel.
4. Move the gas control knob or switch to “OFF” (see Figure
1). Do not force.
5. Replace the burner compartment access panel.
Temperature Control
There are many types and styles of thermostats. Yours may
look different from the one shown in Figure M-2 on page 32,
depending on the type of thermostat and whether cooling was
installed with the system. However, almost all thermostats
perform the same basic functions described in the following
section.
Thermostat Operation
There are four buttons located on the thermostat (see Figure
M-2 on page 32). One button controls the heating and cooling
(if applicable) functions. Another Button is for “FAN”
operation, either continuous or automatic. The remaining
two buttons set the temperature range for the heating
temperature and the cooling temperature desired.
To put the system into operation, push the button to either
“HEAT” or “COOL” position. After choosing the type of
operation, set the thermostat to the temperature you would
like the system to maintain.
Fan Operation
You may wish to increase your comfort by setting your system
for continuous air circulation of the indoor air. The fan switch
on the thermostat permits you to do this (see Figure M-2 on
page 32).
With the switch in the “ON” position the fan will operate
continuously. “AUTO” position gives fan operation only when
the unit is in either heating or cooling.
Furnace Operation
If your furnace is operating but fails to provide complete
comfort, check the following before calling for service:
1. Be sure the thermostat setting is correct.
2. Check to see if the filter is clean.
3. Be sure air can circulate freely throughout your home.
Do not block supply registers or return grilles with
furniture or rugs.
Lighting Instructions
1. STOP! Read the previous safety information.
2. Set the thermostat to the lowest setting.
3. Turn off all electric power to the furnace.
4. Remove the burner compartment access panel.
5. This appliance is equipped with an automatic ignition
device. Do not try to light the burners by hand.
6. Move the gas control knob or switch to “OFF” (see
Figure M-1).
7. Wait 5 minutes to clear out any gas, then smell for gas
(including at the bottom of the unit near the ground). If
you smell gas,
stop and follow the directions in WHAT
TO DO IF YOU SMELL GAS on page 29. If you don’t
smell gas, continue to next step.
8. Move the gas control knob or switch to “ON”.
9. Replace the burner compartment access panel.
10. Turn on all electric power to the furnace.
11. Set the thermostat to the desired setting.
12. If the furnace will not operate, follow the instructions
found below in To Turn Off Gas to Furnace and call
your service technician or gas supplier.
Shutting Down the Furnace
To shut down the furnace, set the thermostat to the “OFF”
position.