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LIGHTING INSTRUCTIONS
1. STOP! Read all preceding safety
information.
2. Set the thermostat to lowest setting.
3. Turn OFF all electrical power to the
appliance.
4. This furnace is equipped with an
ignition device which automatically
lights the burners. Do not try to light
the burners by hand.
5. Remove the control access panel.
6. Turn gas control switch to "OFF".
7. Wait five (5) minutes to clear out
any gas. If you then smell gas,
STOP! Follow step B in the preced-
ing safety information. If you don't
smell gas, go to the next step.
8. Turn gas control switch to "ON". Do
not force.
9. Replace control access panel.
10.Turn on all electrical power to the
appliance.
11.Set thermostat to the desired set-
ting.
12.The unit will go through a 17-sec-
ond igniter warm-up period. Then if
the unit does not light within 4 sec-
onds, the unit will go through two
additional cycles before locking out.
13.If the furnace will not operate, follow
the instructions "To Turn OFF Gas
To Furnace" and call your service
technician or gas supplier.
Inlet
Wrench
Boss
Main Regulator
On/Off Switch
Adjust
Gas Valves - White-Rodgers
36F52-204
Unitary Products Group
SHUTDOWN INSTRUCTIONS
To Turn OFF Gas To Furnace
Should overheating occur, or the gas
supply fail to shut off, shut off the main
manual gas valve to the furnace
before shutting off the electrical sup-
ply.
1. Set thermostat to the lowest setting.
2. Turn off all electrical power to the
furnace if service is to be per-
formed.
3. Remove the control access panel.
4. Turn gas control switch to "OFF". If
gas valve is equipped with a control
knob, turn knob clockwise to "OFF"
position.
5. Replace the control access panel.
Typical Gas Piping
YOUR FURNACE'S FILTER -
WHAT IT DOES
Outlet
The filter in your furnace takes the lint and
dust out of the air that passes through it.
This keeps dirt particles from getting into the
moving parts of the furnace, where they
could cause serious damage. It also keeps
the dirt from circulating through your home.
As the filter continues to collect these parti-
cles, it becomes clogged and no longer
allows enough air to circulate through the
furnace. If this happens, the heat exchang-
ers and blower motor could overheat; a
potentially dangerous situation. It is very
important to keep the air filter clean! Never
operate your furnace without a suitable air
filter.
035-14379-000 REV C (900)
FREQUENCY OF CHECKING
FILTERS
Clean your furnace's filter at least every
three months. If you need to replace a filter,
check the filter chart to be sure you install
the right size and type of filter for your fur-
nace.
If your home is new, you should check the
filter every week for the first four weeks after
you begin to use the furnace, and then at
least every three weeks after that, especially
if the system runs constantly.
LOCATING / REMOVING FILTERS
Upflow Furnaces
Most upflow furnaces have their filters
located on the side or bottom of the furnace
in a filter frame.
If your furnace has this type return filter
frame, remove the door by pulling on it.
Slide the filter out of its channel. To replace
after cleaning, slide filter into place and
snap the door on the end of the filter rack.
Some installations may have filters located
in the blower compartment. Check with the
installer for your filter location.
Upflow Furnace Internal Filter
Applications
To check filters located in the blower com-
partment, remove th upper furnace door by
lifting up. Pull out bottom of door and lower
from furnace. Remove th blower compart-
ment panel by lifting up.
Note:The spring-loaded safety cutoff switch,
mounted under the blower deck will auto-
matically cut off the electrical power supply
to the furnace when the blower panel is
removed.
To remove bottom mounted filter (s) on all
furnaces, push the looped end of the filter
retainer to the side and then lift up. Reverse
the procedure to reinstall filters.
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