Desa BTU/HR - Manual (Page 9)

www.desatech.com 113282-01C 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 10 or 11.
2. Lift upper shell off.
3. Remove fan guard.
Upper Shell
Fan Guard
Figure 10 - Upper Shell Removal,
40/50/55/60/70 Models Only
Figure 11 - Upper Shell Removal,
110/115/155/165/200 Models Only
Fan
Guard
Upper Shell
Screw
Screw
FAN
IMPORTANT: Remove fan from motor shaft be-
fore removing motor from heater. The weight of
the motor resting on the fan could damage the fan
pitch (see Figure 12).
1. Remove upper shell (see Figure 10 or 11).
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 12 - Fan, Motor Shaft, and
Setscrew Location
Motor
Shaft
Fan
Setscrew
Figure 13 - 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 13).
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 10 or 11).
2. Remove filter end cover screws using 5/16" nut-
driver (see Figure 14 or Figure 15, page 10).
3. Remove filter end cover.
4. Replace air output and lint filters.
5. Wash or replace air intake filter (see Preven-
tative Maintenance Schedule, page 7).
Air Intake Filter
Lint Filter
Filter End
Cover
Air Output Filter
Figure 14 - Air Output, Air Intake, and
Lint Filters, 40/50/55/60/70 Models Only