Desa BTU/HR Service Procedures, Continued, Fuel And Air Line Replacement And Proper Routing

Models: BTU/HR

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FUEL AND AIR LINE REPLACEMENT AND PROPER ROUTING

SERVICE PROCEDURES

Continued

(For 200 Model Only)

1.Remove combustion chamber and ignitor by following steps 1 through 7 under Ignitor, pages 11 and 12.

2.Carefully place the ignitor in a safe location.

3.Remove two nozzle adapter bracket screws (see Figure 27).

4.Place hex-shaped aluminum nozzle adapter into vise (do not overtighten).

5.Carefully remove nozzle from nozzle adapter using 5/8" socket wrench (see Figure 28).

6.Blow compressed air through face of nozzle. This will remove any debris in nozzle.

7.Inspect nozzle seal for damage.

8.Replace nozzle into nozzle adapter until nozzle seats. Tighten 80-110 inch-pounds.

9.Attach nozzle adapter bracket to combustion chamber with two screws removed in step 3.

10.Repeat steps 9 through 16 under Ignitor, page 11.

FUEL AND AIR LINE REPLACEMENT AND PROPER ROUTING

1.

Remove upper shell (see Upper Shell Re-

 

moval, page 9).

2.

Remove side cover screws using 5/16" nut

 

driver (see Figure 18 or 19, page 10).

3.

Remove side cover.

4.

Inspect fuel and air line hoses for cracks and/

 

or holes. If fuel line hose is damaged, discon-

 

nect from nozzle adapter (see Figure 23 or 24,

 

page 12, or Figure 27) and from fuel filter (see

 

Fuel Filter, page 10). If air line hose is dam-

 

aged, disconnect from nozzle adapter (see Fig-

 

ure 23 or 24, page 12, or Figure 27) and from

 

barb fitting on pump end cover (see Figure 29).

5.

Install new air and/or fuel line. Attach one end

 

of air line hose to barb fitting on pump end cover

 

(see Figure 29) and the other end to nozzle

 

adapter (see Figure 23 or 24, page 12, or Figure

 

27). Attach one end of fuel line hose to fuel fil-

 

ter (see Fuel Filter, page 10) and the other end

 

to nozzle adapter (see Figure 23 or 24, page 12,

 

or Figure 27).

 

Note: Route hoses as shown in see Figure 23

 

or 24, page 12, or Figure 27, according to

Combustion

Chamber Shell Removal, page 9).

Nozzle

Adapter

Bracket

Photocell

Bracket

Nozzle

Adapter

Bracket

Screw

Figure 27 - Removing Air and Fuel LineHoses (200 Model Only) Nozzle/

Adapter

Assembly

 

model. Hoses are not to touch photocell

 

bracket.

6.

Replace side cover.

7.

Replace upper shell and fan guard (see Upper

 

Shell Removal, page 9).

Pump End Cover

Barb Fitting

Air Line

Hose

Fuel Line Hose

Figure 27 - Removing Air and Fuel Line
Hoses (200 Model Only)

Nozzle Face

Nozzle

 

 

 

 

Sleeve

 

Nozzle

 

Nozzle

 

Adapter

Nozzle

 

 

Adapter

 

 

Bracket

 

 

 

Air Line

 

 

Fitting

Fuel Line Fitting

 

 

Figure 28 - Nozzle and Nozzle Adapter

Barb

Fitting

Figure 28 - Nozzle and Nozzle AdapterAir HoseFigure 29 - Air Hose to Barb Fitting

40/50/55/60/70 110/115/155/165/200

ModelsModels

Figure 29 - Air Hose to Barb Fitting

113282-01C

www.desatech.com

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Desa BTU/HR Service Procedures, Continued, Fuel And Air Line Replacement And Proper Routing, Shell Removal, page