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blower/ignition control a ndclosesthemaingasvalve, T o
reset,pushthebutton
on top of the switch,
Auxiliary
Limit
This control is located in the side of the circulating air blower
housing. The switch will open and shut off the blower/ignition
control and close the main gas valve should the circulating
blower fail to operate, This control resets automatically,
Normal Maintenance
Periodic inspection and maintenance normally consists of
changing or cleaning filters and (under some conditions)
cleaning the main burners,
Filters
Not supplied. Inspect once a month, Replace disposable or
clean permanent type as necessary, DO NOT replace per-
manent type with disposable,
Motors
Indoor, outdoor fan and vent motors are permanently
lubricated and require no maintenance,
Outdoor Coil
Dirt and debris should not be allowed to accumulate on the
outdoor coil surface or other parts in the air circuit. Cleaning
should be as often as necessary to keep the coil clean. 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,
To Clean Burners
Remove them from the furnace as explained in "Burner In-
structions." Vacuum and/or brush as required,
Vent Outlet
Visually inspect vent outlet periodically to make sure that the
buildup of soot and dirt is not excessive. If necessary, clean
to maintain adequate opening to discharge flue products,
Cleaning
Flue Passages
& Heating Elements
With proper combustion adjustment the heat exchanger of a
gas-fired furnace will seldom need cleaning. If the heat ex-
changer should become sooted, it can be cleaned as follows:
1 - Remove the burner assembly as outlined in "BURNER
INSTRUCTIONS."
2 - Remove the combustion air inducer.
3 - At the bottom of the heat section, remove the screws
holding the flue collector box, Carefully remove the
flue collector box without ripping the adjacent insula-
tion,
4 - Using a wire brush on a flexible wand, brush out the
inside of each heat exchanger from the burner inlet
and flue outlet ends,
5 - Brush out the inside of the flue collector box.
6 - Run the wire brush down the heat exchanger tubes
from the flue collector end,
7 - If soot buildup is excessive, remove the vent motor
and clean the wheel and housing. Run the wire brush
down the flue extension at the outlet of the vent hous-
ing,
8 - After brushing is complete, blow all brushed areas with
air. Vacuum as needed,
9 - Replace parts in the reverse order they were removed
in steps 1 to 3.
10 - When replacing the flue collector box, be careful not to
tear the adjoining insulation,
11 - Assure that all joints on the vent side of the combustion
system
are air tight.
Apply
a high temperature
(+500 _F) sealing compound where needed,
Draft motor operates and furnace lights but circulating air
blower does not start after the time delay circuit expires
with room thermostat fan switch set to AUTO.
a - Set fan switch to "on2 If blower motor runs, go to step f.
If it does not, check to see if line voltage is being sup-
plied to the high voltage side of the blower time delay
relay (TDR) contacts.
b - If "TDR" is closed, touch the supply air blower motor
housing. If it is hot, the motor may be off on internal
protection. Allow time for the internal overload to reset.
Disconnect power to the unit and check the blower
motor capacitor. If it is defective, replace it with one of
the equal capacitance and voltage.
c -If "TDR" is closed and the blower motor still does not
run, replace the blower motor.
d -If "TDR" is not closed check for 24 volts at W on the
"TDR." If 24 volts are present, replace the blower/igni-
tion control board.
e -If the blower motor runs with the fan switch in the "on"
position but does not run soon after the furnace has ig-
nited with the fan switch in the "Auto" position, check
for loose 24 volt wires between "TDR" and the trans-
former.
Thermostat
calls for heat but the draft motor does not
come on,
a -The draft motor has internal protection. If the motor
shell is hot to the touch, allow time for the internal over-
load to reset.
b -If the motor shell is cold with the room thermostat call-
ing for heat, check to see that there is 208/230 volts
between L1 blower/ignition control and black line wire
to draft motor. If no voltage present, check all connec-
tions. If the draft motor still does not operate, then
check for 208/230 volts between combustion blower/
ignition control and black line wire to draft motor. If volt-
age is not present and there is voltage between L1 on
blower/ignition control and black line wire and 24 volts
present at TS, then replace the blower/ignition control,
Draft motor runs but the furnace does not light,
a -Check all connections on the PSW circuit of blower/
ignition control and make sure the rollout switch and
high limit switch are all closed circuits,
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