Desa R70D Nozzle Assembly, Fuel And Air Line Replacement And Proper Routing, Service Procedures

Models: R70D B70D

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NOZZLE ASSEMBLY

OWNER’S MANUAL

SERVICE

PROCEDURES

Continued

NOZZLE ASSEMBLY

1.Remove upper shell (see page 7).

2.Remove fan (see page 7).

3.Remove fuel and air line hoses from nozzle assembly (see Figure 12).

4.Turn nozzle assembly 1/4 turn to left and pull toward motor to remove (see Figure 13).

5.Place plastic hex-body into vise and lightly tighten.

6.Carefully remove nozzle from the nozzle adapter using 5/8" socket wrench (see Figure 14).

7.Blow compressed air through face of nozzle. This will free any dirt in nozzle area.

8.Inspect nozzle seal for damage.

9.Replace nozzle into nozzle adapter un- til nozzle seats. Tighten 1/3 turn more using 5/8" socket wrench (40-45 inch- pounds).

10.Attach nozzle assembly to burner strap.

11.Attach and route fuel and airline hoses to nozzle assembly as shown (see Fig- ure 12). Route photo cell wires as shown in Figure 12.

12.Replace fan (see page 7).

13.Replace fan guard and upper shell.

Combustion

Chamber

Burner

Strap

FUEL AND AIR LINEManual backgroundManual background Nozzle/

Adapter

Assembly

 

Fuel Line

Air Line

Hose

 

Hose

Photocell

 

Wires

Figure 12 - Removing Air and Fuel Line Hoses

Combustion

Chamber

Nozzle/

Adapter

Assembly

Figure 13 - Removing Nozzle/Adapter Assembly

Nozzle

Face

Nozzle

Seal

Nozzle

Nozzle

Adapter

Air Line

Fitting Fuel Line

Fitting

Figure 14 - Nozzle and Nozzle Adapter

FUEL AND AIR LINE

REPLACEMENT AND

PROPER ROUTING

1.Remove upper shell (see Upper Shell Removal, page 7).

2.Remove side cover screws using 5/16" nut driver (see Figure 8, page 8).

3.Remove side cover.

4.Inspect fuel and air line hoses for cracks and/or holes. If fuel line hose is damaged, disconnect from nozzle adapter (see Fig- ure 12) and from fuel filter (see Fuel Fil- ter, page 8). If air line hose is damaged, disconnect from nozzle adapter (see Fig- ure 12) and from barb fitting on pump end cover (see Figure 15).

5.Install new air and/or fuel line. Attach one end of air line hose to barb fitting on pump end cover (see Figure 15) and the other end to nozzle adapter (see Figure 12). Attach one end of fuel line hose to fuel filter (see Fuel Filter, page 8) and the other end to nozzle adapter (see Figure 12). Route air and fuel line approximately as shown in Figure 12.

Note: Route hoses as shown in Figure

12. Hoses are not to touch photocell bracket.

6.Replace side cover.

7.Replace upper shell and fan guard (see Upper Shell Removal, page 7).

Pump End Cover

Barb Fitting

Air Hose

Figure 15 - Air Hose to Barb FItting

Continued

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Desa R70D, B70D Nozzle Assembly, Fuel And Air Line Replacement And Proper Routing, Service Procedures, Continued

FAQ

What are the steps for nozzle assembly?

The steps for nozzle assembly include removing the upper shell and fan, removing fuel and air line hoses, turning the nozzle assembly 1/4 turn to the left, removing the nozzle from the nozzle adapter, blowing compressed air through the face of the nozzle, inspecting the nozzle seal, and replacing the nozzle into the nozzle adapter.

How should I replace fuel and air lines?

To replace fuel and air lines, you need to remove the upper shell and side cover, inspect the hoses for damage, disconnect them from the nozzle adapter and fuel filter (if damaged), install new hoses, and route them as shown in the provided diagram.

What should I do if the fuel line hose is damaged?

If the fuel line hose is damaged, disconnect it from the nozzle adapter and fuel filter, and install a new hose according to the provided instructions.