70,000 Btu/Hr H.S.I. Series

PORTABLE FORCED AIR HEATERS

SERVICE PROCEDURES

Continued

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

FUEL FILTER

6.Remove combustion chamber. Stand combustion chamber on end with nozzle adapter bracket on top (see Fig- ure 10).

7.Remove ignitor screw with a 1/4" nut driver. Carefully remove ignitor from nozzle adapter bracket.

CAUTION:Donotbendorstrike ignitor element. Handle with care.

Photocell Bracket

Ignitor Element

Ignitor Screw/

Washer

Assembly

Ignitor

Nozzle Adapter Bracket

1.Remove 4 side cover screws using 5/16" nut-driver.

2.Remove side cover.

3.Pull upper fuel line off fuel filter neck.

4.Carefully pry bushing and fuel filter out of fuel tank.

5.Wash fuel filter with clean fuel and re- place in tank.

6.Attach upper fuel line to fuel filter neck.

7.Replace side cover.

Fuel Filter

8.Carefully remove replacement ignitor from styrofoam packing.

9.Carefully guide ignitor into opening in nozzle adapter bracket. Do not strike ig- nitor element. Attach ignitor to nozzle adapter bracket with screw using a 1/4" nut driver (see Figure 10). Torque 8 to 15 in. lbs. Do not over torque.

10.Replace combustion chamber.

11.Route the ignitor wires back down through the hole in the lower shell. Connect wires to the ignition control assembly.

12.Replace side cover (see Figure 8).

13.Connect and route fuel line hose and air line hose to nozzle adapter (see Figure 9).

14.Replace photocell in photocell bracket. Route wires as shown in Figure 12, page 9.

15.Replace fan (see page 7).

16.Replace fan guard and upper shell (see page 7).

Combustion

Nozzle Adapter

Chamber

Bracket Opening

Figure 10 - Ignitor Replacement

IGNITION CONTROL

ASSEMBLY

(Procedure for Replacing Fuse)

WARNING: High Voltage

1.

Unplug heater

2.

Remove side cover screws (4) using

 

5/16" nut-driver to expose ignition con-

 

trol assembly.

3.

Remove fuse cover.

4.

Remove fuse from fuse clips.

5.

Replace fuse with fuse of the same type

 

and rating (GMA-10). Do not substi-

Side Cover

Upper Fuel Line

Figure 8 - Fuel Filter Removal

IGNITOR

1.

Remove upper shell and fan guard (see

 

page 7).

2.

Remove fan (see page 7).

3.

Remove 4 side cover screws with a

 

5/16" nut driver. Remove side cover

Combustion Chamber

Air Line

Hose

Fuel

Line

Hose

Nozzle Adapter Bracket

Ignitor

Ignitor

Wires

 

tute a fuse with a higher current rating.

6.

Replace fuse cover.

7.

Replace side cover.

Fuse

Fuse

Clips

Cover

 

 

Fuse

 

(see Figure 8).

4.

Disconnect ignitor wires (yellow) from

 

ignition control assembly (see Figure

 

9). Pull the ignitor wires up through the

 

hole in the lower shell.

5.

Disconnect fuel line hose and air line

 

hose. Remove photocell from photocell

 

bracket (see Figure 9).

Photocell

Ignition

Bracket

Control

 

Photocell

Assembly

 

Assembly

 

Side Cover

 

Figure 9 - Disconnecting Ignitor Wires from Ignition Control Assembly

Figure 11 - Replacing Fuse

8

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Image 8
Desa B70D, R70D owner manual Fuel Filter, Ignition Control Assembly, Ignitor, Procedure for Replacing Fuse

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