Desa B600D, B350D owner manual Service Procedures, Upper Shell Removal, Spark Plug, Nozzle

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.

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.

Upper Shell

Air Deflector

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.

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 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, page 11).

8.Inspect nozzle for damage. If damaged or clogged, replace nozzle.

9.Make sure plug is in place on burner 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.

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

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.

Burner Head

Spark Plug

Spark

Plug Wire

Figure 7 - Spark Plug Removal

.075 inch

Figure 8 - Spark Plug Gap

10 099507