Desa H.S.I. Series Owner's Manual page 7

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 Fig-
ure 4.
2. Lift upper shell off.
3. Remove fan guard.
Screw
Figure 4 - Upper Shell Removal
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 5).
1. Remove upper shell (see Figure 4).
2. Use 1/8" allen wrench to loosen setscrew which holds fan to
motor shaft.
3. Slip fan off motor shaft.
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 6).
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.
112846-01A
Upper Shell
Fan
Guard
For more information, visit www.desatech.com
For more information, visit www.desatech.com
SERVICE PROCEDURES
Fan
Setscrew
Motor
Shaft
Figure 5 - Fan, Motor Shaft,
and Setscrew Location
AIR OUTPUT, AIR INTAKE AND LINT FILTERS
1. Remove upper shell (see Figure 4).
2. Remove filter end cover screws using 5/16" nut-driver (see
Figure 7).
3. Remove filter end cover.
4. Replace air output and lint filters.
5. Wash or replace air intake filter (see Preventative Maintenance
Schedule, page 5).
6. Replace filter end cover.
7. Replace fan guard and upper shell.
IMPORTANT: Do not oil filters.
Lint Filter
Air Output
Filter
Figure 7 - Air Output, Air Intake, and Lint Filters
7 7
Setscrew
Motor
Fan
Flush
Motor
Shaft
Figure 6 - Fan Cross Section
Air Intake
Filter
Filter End
Cover