Desa 8 (30, 44 kW (150, 5 (70, 4 (90, 20, 26, 000 Btu/Hr) Nozzle, Remove upper shell see page

Nozzle

(44 kW [150,000 Btu/Hr] Model)

1.Remove upper shell (see page 10).

2.Remove fan (see page 19).

3.Remove spark plug wire from spark plug.

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

5.Loosen flare nut using 3/4" open-end wrench. Push fuel tube down.

6.Remove air line hose from burner head.

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

8.Place burner head into vise and lightly tighten.

9.Carefully remove nozzle from burner head using 5/8" socket wrench (see Figure 30).

10.Blow compressed air thru face of nozzle. This will free any dirt in nozzle area.

11.Inspect nozzle seal for damage.

12.Replace nozzle into burner head and tighten firmly

(80-110 inch-pounds/9.1-

12.4 n-m).

13.Attach burner head to combustion chamber.

14.Install spark plug in burner head.

15.Attach spark plug wire to spark plug.

16.Attach fuel tube and airline hose to burner head. Attach flare nut until nut seats against fuel tube and fitting. Tighten 1/4 turn more using 3/4" open-end wrench (100-130 inch- pounds/11.3-14.7 n-m).

17.Replace fan (see page 19).

18.Replace fan guard and upper shell.

Combustion

Chamber

	Spark Plug
Burner Head	Wire

Screw

Spark

Plug

Air Line Hose

Flare Nut

Fuel Tube

Figure 29 - Removing Burner Head, 44 kW (150,000 Btu/Hr) Model

Nozzle

Face

Nozzle

Seal

Nozzle

Burner

Head

Figure 30 - Removing Nozzle, 44 kW (150,000 Btu/Hr) Model

17

099623