Desa BC40 - Manuel (Page 9)

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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 7 or 8.
2. Lift upper shell off.
3. Remove fan guard.
Screw
Upper Shell
Fan Guard
Figure 7 - Upper Shell Removal
(40/55T/70T Models Only)
Screw Upper Shell
Fan Guard
Figure 8 - Upper Shell Removal
(115T/165T Models Only)
Figure 9 - Fan, Motor Shaft, and
Setscrew Location
Flush
Fan Setscrew
Motor Shaft
Motor
Figure 10 - Fan Cross Section
Setscrew
Motor Shaft
Fan
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 9).
1. Remove upper shell (see Figure 7 or 8).
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 10).
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.