# 47860A005Page 24
It is recommended that this furnace be inspected by a
qualified service technician at the beginning of each
heating season.
Filters
Filters should be checked at least every 6 weeks. Dispos-
able filters should be replaced when dirty, and cleanable
filters should be cleaned regularly. It is important to keep the
air filters clean, as dirty filters can restrict airflow and the
blower and induced draft motors depend upon sufficient air
flowing across and through them to keep from overheating.
Lubrication
The blower motor and induced draft motor are pre-lubri-
cated by the manufacturer and do not require further
lubricating attention. However, the motors should be
cleaned periodically to prevent the possibility of overheating
due to an accumulation of dust and dirt on the windings or
on the motor exterior.
Condensate Collection and Disposal System
Check the condensate drain line periodically for blockage.
Visual inspection of condensate flow can be done easily
while the furnace is in operation. Use a flashlight to
illuminate the discharge end of the condensate drain that
is placed in the sewer opening. If the condensate drain
line becomes blocked or plugged, the furnace will not
operate properly.
MAINTENANCE
Failure to follow the safety warnings exactly
could result in dangerous operation, serious
injury, death, or property damage.
Improper servicing could result in dangerous
operation, serious injury, death, or property
damage.
• Before servicing, disconnect all electrical
power to furnace.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
WARNING
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD
and Table 4. Typical manifold set point for installations at
altitudes from 0 to 4500 feet above sea level is 10.0" W.C.
Temperature Rise
Check the temperature rise and, if necessary, adjust blower
speed to maintain temperature rise within the range shown
on the unit rating plate.
High Altitude
In both the United States and Canada, this furnace is
approved for operation at altitudes from 0 to 4500 feet
above sea level without any required modifications. From
4500 to 7500 feet, the gas manifold pressure needs to be
adjusted according to the information shown in Table 4.
To adjust the manifold pressure, refer to Checking and
Adjusting Gas Input on page 23. For installations above
7500 feet, call Technical Service at 1-800-448-5872 ext.
2610 for assistance.
Manifold Pressure vs. Altitude
* Consult local utility for actual heating value.
Furnace Input = Input Factor x Nameplate Input
Above 7500 feet, call Technical Services at 1-800-
448-5872 ext. 2610.
Table 4
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saGlarutaN )PL(enaporP
tupnItupnI
tupnI
tupnItupnI
rotcaFrotcaF
rotcaF
rotcaFrotcaF
gnitaeH
*eulaV
tf/UTB(
3
)
dlofinaM
erusserP
).C.W.ni(
gnitaeH
*eulaV
tf/UTB(
3
)
dlofinaM
erusserP
.C.W.ni()
000284905.3872200.016669.0
0003 419 05.3 6912 00.01 9949.0
000418805.3611200.012339.0
0054 568 05.3 7702 00.01 9429.0
000594892.3930214.90098.0
0055 338 72.3 0002 53.9 0978.0
000681852.3469192.90868.0
0056 208 32.3 7291 42.9 0758.0
000778712.3198181.90648.0
0057 177 91.3 3581 21.9 0538.0
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