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Disconnect power to the unit before removing the blower
door. Failure to follow this warning could result in personal
injury from moving parts.
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CARBON MONOXIDE POISONING HAZARD
Failure to follow the service and/or periodic maintenance
instructions for the furnace and venting system, could result
in carbon monoxide poisoning or death.
1. GENERAL INSPECTION — Examine the furnace installa-
tion annually for the following items:
a. All flue product carrying areas external to the furnace
(i.e. chimney, vent connector) are clear and free of ob-
struction. A vent screen in the end of the vent (flue) pipe
must be inspected for blockage annually.
b. The vent connector is in place, slopes upward and is
physically sound without holes or excessive corrosion.
c. The return air duct connection(s) is physically sound, is
sealed to the furnace and terminates outside the space
containing the furnace.
d. The physical support of the furnace should be sound
without sagging, cracks, gaps, etc., around the base so
as to provide a seal between the support and the base.
e. There are no obvious signs of deterioration of the
furnace.
2. FILTERS — Filters should be cleaned or replaced (with high
velocity filters only), monthly and more frequently during high
use times of the year such as midsummer or midwinter.
3. BLOWERS — The blower size and speed determine the air
volume delivered by the furnace. The blower motor bearings are
factory lubricated and under normal operating conditions do not
require servicing. If motor lubrication is required it should only be
done by a qualified servicer. Annual cleaning of the blower wheel
and housing is recommended for maximum air output, and this
must be performed only by a qualified servicer or service agency.
4. IGNITER — This unit has a hot surface direct ignition device
that automatically lights the burners. Please note that it is very
fragile and should be handled with care.
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Do not touch igniter. It is extremely hot. Failure to follow this
warning could result in severe burns.
5. BURNER — Gas burners do not normally require scheduled
servicing, however, accumulation of foreign material may cause
a yellowing flame or delayed ignition. Either condition indicates
that a service call is required. For best operation, burners must be
cleaned annually using brushes and vacuum cleaner.
Pub. No. 41-5010-20
PERIODIC SERVICING REQUIREMENTS
WARNING
WARNING
WARNING
Maintenance and Service
Turn off gas and electric power supply. To clean burners, remove
burner box cover (6 to 8 screws) and top burner bracket. Lift
burners from orifices.
NOTE:
Be careful not to break igniter when removing burners.
Clean burners with brush and/or vacuum cleaner. Reassemble
parts by reversal of the above procedure. The burner box must be
resealed when replacing box cover.
NOTE:
On LP (propane) units, some light yellow tipping of the outer
mantle is normal. Inner mantle should be bright blue.
Natural gas units should not have any yellow tipped flames. This
condition indicates that a service call is required. For best opera-
tion, burners must be cleaned annually using brushes and vacuum
cleaner.
NOTE:
On LP (propane) units, due to variations in BTU content and
altitude, servicing may be required at shorter intervals.
6. HEAT EXCHANGER/FLUE PIPE — These items must be
inspected for signs of corrosion, and/or deterioration at the begin-
ning of each heating season by a qualified service technician and
cleaned annually for best operation. To clean flue gas passages,
follow recommendations below:
a. Turn off gas and electric power supply.
b. Inspect flue pipe exterior for cracks, leaks, holes or
leaky joints.
c. Remove burner compartment door from furnace.
d. Inspect flue collector box. Inspect induced draft blower
flue pipe connection.
e. Remove burners. (See 4.)
f. Use a mirror and flashlight to inspect interior of heat
exchanger, be careful not to damage the igniter, flame
sensor or other components.
g. If any corrosion is present, contact a service agency.
Heat exchanger should be cleaned by a qualified service
technician.
h. After inspection is complete replace furnace door.
i. Restore gas supply. Check for leaks using a soap solu-
tion. Restore electrical supply. Check unit for normal
operation.
7. COOLING COIL CONDENSATE DRAIN — If a cooling coil
is installed with the furnace, condensate drains should be
checked and cleaned periodically to assure that condensate can
drain freely from coil to drain. If condensate cannot drain freely
water damage could occur. (See Condensate Drain in Installa-
tion Section).
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Label all wires prior to disconnection when servicing con-
trols. Wiring errors can cause improper and dangerous
operation.
Verify proper operation after servicing.
CAUTION
Page 35
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