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SSCBL-RPBL-IOM (10-22) 149159-C
MAINTENANCE—CONTINUED
Maintenance Procedures—Continued
Blower Bearing Lubrication
⚠ CAUTION ⚠
If the blower is unused for more than 3 months, bearings with a grease fitting should be purged
with new grease prior to startup.
NOTE: If unusual environmental conditions exist—temperatures <32°F or >200°F, moisture, or
contaminants—or if unit is in continuous operation, more frequent service is required.
The blower bearings on systems with a <10-HP motor (standard blower) are permanently-lubricated cartridge ball
bearings that do not require greasing . The blower bearings on systems equipped with a 10- to 20-HP motor are
pillow block ball bearings that are equipped with a grease fitting . These bearings should be lubricated twice a year
with a high-temperature, moisture-resistant grease (type NLGI-1 or -2 standard grease is recommended) . Be sure
to clean the grease fitting before adding grease . Add grease with a handgun until a slight bead of grease forms at
the seal . Be careful not to unseat the seal by over-lubricating .
Venter Motor Maintenance
Power venter motors are permanently lubricated . No oiling is required .
Cooling Coil Maintenance
The cooling coil cabinet is designed with easily-removable panels on both sides of the cabinet to provide access for
inspection and cleaning . Inspect the coil during routine maintenance and whenever the filters are changed . Check
the cooling coil for build up of debris and clean as required .
Heat Exchanger Cleaning
NOTE: For cleaning the inner surfaces of the heat exchanger, an air hose, a long (18- to 24-inch)
stiff brush of 1/2-inch diameter or heavy wire with steel wool securely attached, a flashlight, and
a mirror are needed.
1 . Clean heat exchanger inner surfaces (combustion gas side):
a . Remove burner rack assembly in accordance with
section .
b . Clean inner surfaces using furnace brush or piece of heavy wire to which piece of steel wool is attached . Scrub
tube walls to remove any accumulated dust, rust, and/or soot .
c . Install burner rack assembly in accordance with
section .
2 . For unit size 400 only, clean heat exchanger outer surfaces (circulating air side):
a . Gain access by removing inspection panels in ductwork or remove ductwork .
b . For standard (not high CFM) furnaces, remove baffle screws (see
) and lift each airflow baffle slightly
and slide forward . Remove all baffles from heat exchanger .
c . Remove accumulated dust and grease deposits from heat exchanger tubes and baffles using brush and/or
air hose .
d . Reinstall airflow baffles removed in step 2b and secure using baffle screws .
e . Secure ductwork as necessary .
3 . Check furnace for proper operation .
