Desa Tech HEATERS OWNER'S MANUAL Service Procedures, Upper Shell Removal, Spark Plug, Nozzle

SERVICE PROCEDURES

WARNING: Never service heater while it is plugged in, op- erating or hot. Severe burns and electrical shock can occur. Only aqualifiedservicepersonshould service and repair heater.

UPPER SHELL REMOVAL

1.Remove screws along each side and top of heater using 5/16" nut-driver. These screws attach upper and lower shells together (see Figure 6).

2.Lift upper shell off.

SPARK PLUG

1.Remove upper shell (see Upper Shell Removal).

2.Remove spark plug wire from spark plug (see Figure 8).

3.Remove spark plug from burner head using 13/16" open-end wrench (see Figure 8).

4.Replace spark plug if damaged or heavily coated with carbon.

5.Clean and regap spark plug electrodes to .075 inch (see Figure 9).

6.Install spark plug in burner head.

7.Attach spark plug wire to spark plug.

8.Replace upper shell.

Burner	Spark Plug
Head

Upper Shell

Figure 6 - Upper Shell Removal,

600,000 Btu/Hr Model

FAN BLADES AND AIR

DEFLECTORS

1.Remove upper shell (see Upper Shell Re- moval).

2.Clean fan blades and air deflectors with clean, soft cloth moistened with kerosene or solvent (see Figure 7).

3.Dry fan blades and air deflectors thoroughly.

4.Replace upper shell.

Air

Deflector

Fan

Blade

Figure 7 - Fan Blades and Air Deflectors

Spark Plug

Wire

Figure 8 - Spark Plug Removal

.075

inch

Figure 9 - Spark Plug Gap

NOZZLE

1.Remove upper shell (see Upper Shell Re- moval).

2.Remove fuel line from solenoid valve using 7/16" wrench.

3.Remove spark plug wire from spark plug.

4.Remove spark plug from burner head using 13/16" open-end wrench.

5.Remove five screws using 5/16" nut-driver and remove burner head from combustion chamber.

6.Place burner head into vise and lightly tighten.

7.Carefully remove nozzle from burner head using 5/8" socket wrench (see Figure 10).

	Plug	Spark Plug
Nozzle
		Spark Plug
Burner		Wire
Head	Fuel Line	Solenoid Valve
Figure 10 - Replacing Nozzle

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