Desa BTU/HR Service Procedures, Upper Shell Removal, Air Output, Air Intake And Lint Filters

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.

Screw	Upper Shell
	Fan Guard

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.

Fan

Setscrew

Motor Shaft

Figure 12 - Fan, Motor Shaft, and

Setscrew Location

Motor Setscrew Fan

Figure 10 - Upper Shell Removal,

40/50/55/60/70 Models Only

Screw

Upper Shell

Fan

Guard

Figure 11 - Upper Shell Removal, 110/115/155/165/200 Models Only

Flush

Motor

Shaft

Figure 13 - Fan Cross Section

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).

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.

Lint Filter

Air Intake Filter

Filter End

Cover

Air Output Filter

3. Slip fan off motor shaft.

Figure 14 - Air Output, Air Intake, and Lint Filters, 40/50/55/60/70 Models Only

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