Desa BC40 Service Procedures, Upper Shell Removal, 40/55T/70T Models Only, 115T/165T Models Only

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

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.

Fan

Setscrew

Figure 7 - Upper Shell Removal

(40/55T/70T Models Only)

Screw Upper Shell

Fan Guard

Figure 8 - Upper Shell Removal

(115T/165T Models Only)

Motor Shaft

Figure 9 - Fan, Motor Shaft, and

Setscrew Location

Setscrew	Fan
Motor

Flush

Motor Shaft

Figure 10 - Fan Cross Section

111168-01A www.desatech.com 9