Desa SB600D, SB350D Service Procedures, Fan Blades and Air Deflectors, Nozzle, Upper Shell Removal

HIGH PRESSURE PORTABLE FORCED AIR HEATER 350,000 AND 600,000 BTU/HR

SERVICE PROCEDURES

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

Fan Blades and Air Deflectors

1.Remove upper shell (see column 1).

2.Clean fan blades and air deflectors with clean, soft cloth moistened with kero- sene or solvent (see Figure 6).

3.Dry fan blades and air deflectors thor- oughly.

4.Replace upper shell.

Air Deflector

Nozzle

1.	Remove upper shell (see column 1).
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

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 5).

2.Lift upper shell off.

	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 Fig-
	ure 9).
8.	Inspect nozzle for damage. If damaged
	or clogged, replace nozzle.
9.	Make sure plug is in place on burner

Upper Shell

Figure 5 - Upper Shell Removal, 600,000 Btu/Hr Model

Fan Blade

Figure 6 - Fan Blades and Air Deflectors

Spark Plug

1.Remove upper shell (see column 1).

2.Remove spark plug wire from spark plug (see Figure 7).

3.Remove spark plug from burner head using 13/16"

open-end wrench (see Figure 7).

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

5.Clean and regap spark plug electrodes to .075 inch (see Figure 8).

6.Install spark plug in burner head.

7.Attach spark plug wire to spark plug.

8.Replace upper shell.

Burner Head

Spark Plug

Spark

Plug Wire

Figure 7 - Spark Plug Removal

.075 inch

Figure 8 - Spark Plug Gap

	head.
10.	Replace nozzle into burner head and
	tighten firmly (175-200 inch-pounds).
11. Attach burner head to combustion
	chamber.
12.	Install spark plug in burner head.
13.	Attach spark plug wire to spark plug.
14.	Attach fuel line to solenoid valve.
	Tighten firmly.
15.	Replace upper shell.

Nozzle

Plug Spark

Plug

		Spark
Burner		Plug
		Wire
Head
		Solenoid
	Fuel
		Valve
	Line

Figure 9 - Replacing Nozzle

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