114278-01C
9
SERVICE PROCEDURES
WARNING: To avoid risk of
burn and electrical shock, never
attempt to service heater while it
is plugged in, operating, or hot.
UPPER SHELL REMOVAL
1. Remove screws along each side of heater using
5/16" nut-driver. These screws attach upper and
lower shells together. See Figure 8 or 9.
2. Lift upper shell off.
3. Remove fan guard.
Upper Shell
Fan Guard
Figure 8 - Upper Shell Removal,
70,000 Model Only
Figure 9 - Upper Shell Removal,
165,000 Model Only
Fan
Guard
Upper Shell
Screw
Screw
FAN
IMPORTANT:
Remove fan from motor shaft
before removing motor from heater. The weight
of the motor resting on the fan could damage the
fan pitch (see Figure 10).
1. Remove upper shell (see Figure 8 or 9).
2. Use 1/8" allen wrench to loosen setscrew
which holds fan to motor shaft.
3. Slip fan off motor shaft.
Motor Shaft
Setscrew
Figure 10 - Fan, Motor Shaft, and
Setscrew Location
Motor
Shaft
Fan
Setscrew
Figure 11 - Fan Cross Section
Fan
Flush
Motor
4. Clean fan using a soft cloth moistened with
kerosene or solvent.
5. Dry fan thoroughly.
6. Replace fan on motor shaft. Place fan hub flush
with end of motor shaft (see Figure 11).
7. Place setscrew on flat of shaft. Tighten setscrew
firmly (40-50 inch-pounds/4.5-5.6 n-m).
8. Replace fan guard and upper shell.
AIR OUTPUT, AIR INTAKE AND LINT
FILTERS
1. Remove upper shell (see Figure 8 or 9).
2. Remove filter end cover screws using 5/16" nut-
driver (see Figure 12 or Figure 13, page 10).
3. Remove filter end cover.
4. Replace air output and lint filters.
5. Wash or replace air intake filter (see
Preventa-
tive Maintenance Schedule
, page 7).
Air Intake Filter
Lint Filter
Filter End
Cover
Air Output Filter
Figure 12 - Air Output, Air Intake, and
Lint Filters, 70,000 Model Only
