2. Lubricate motor as follows:
a. Thoroughly clean all accumulations of dirt or grease from
motor housing.
b. Remove dust caps or plugs from oil ports located at each
end of motor.
c. Use a good grade of SAE 20 non-detergent motor oil and
put one teaspoon (1.16 oz. or 16 to 25 drops) in each oil
port.
d. Allow time for oil to be absorbed by each bearing, then
wipe excess oil from motor housing.
e. Replace dust caps or plugs in oil ports.
3. Remove and clean blower wheel as follows:
a. Ensure proper reassembly by marking wheel orientation.
b. Remove screws holding cut-off plate, and remove plate
from housing.
c. Lift wheel from housing. When handling and/or cleaning
blower wheel, be sure not to disturb balance weights (clips)
on blower wheel vanes.
d. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations from wheel
and housing with vacuum cleaner, using soft brush attach-
ment. Remove grease and oil with mild solvent.
e. Reassemble wheel and cut-off plate into housing.
f. Reassemble motor into housing. Be sure setscrews are
tightened on motor shaft flats and not on round part of shaft.
g. Reinstall unit access panel.
4. Restore electrical power to unit. Start unit and check for
proper blower rotation and motor speeds during heating and
cooling cycles.
OUTDOOR COIL, INDOOR COIL, AND CONDENSATE
DRAIN PAN
Inspect the outdoor coil, indoor coil, and condensate drain pan at
least once each year. See Unit Top Removal section.
The coils are easily cleaned when dry; therefore, inspect and clean
the coils either before or after each cooling season. Remove all
obstructions, including weeds and shrubs, that interfere with the
airflow through the outdoor coil.
Table 10—Wet Coil Pressure Drop
UNIT SIZE
AIRFLOW
(CFM)
PRESSURE DROP
(IN. WG)
024
600
0.039
700
0.058
800
0.075
900
0.088
030
900
0.088
1000
0.095
1200
0.123
036
1000
0.068
1200
0.088
1400
0.108
1600
0.123
042
1000
0.048
1200
0.069
1400
0.088
1600
0.102
048
1400
0.068
1550
0.073
1600
0.075
1800
0.088
060
1700
0.082
1900
0.095
2100
0.108
2300
0.123
Table 11—Accessory Electric Heater Pressure Drop (in. wg)
HEATER
KW
CFM
600
800
1000
1200
1400
1600
1800
2000
2200
5–20
0.030
0.033
0.037
0.042
0.047
0.052
0.060
0.067
0.075
Table 12—Filter Pressure Drop (in. wg)
UNIT SIZE
FILTER
SIZE
(IN.)
500 600 700
800
900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
024–036
24 x 24 x 1
—
—
0.06 0.06 0.07 0.07
0.08
0.09
0.10
—
—
—
—
—
—
—
—
—
—
042–060
24 x 30 x 1
—
—
—
—
—
—
—
—
0.08
0.09
0.09
0.10
0.11
0.12
0.13
0.14
0.15
0.17
0.18
27
