Desa H.S.I. Series Owner's Manual page 9

SERVICE PROCEDURES
Continued
6. Remove combustion chamber. Stand combustion chamber on
end with nozzle adapter bracket on top (see Figure 12).
7. Remove ignitor screw with a 5/16" nut driver. Carefully re-
move ignitor from nozzle adapter bracket.
CAUTION: Do not bend or strike ignitor element.
Handle with care.
8. Carefully remove replacement ignitor from packing.
9. Carefully guide ignitor into opening in nozzle adapter bracket.
Do not strike ignitor element. Attach ignitor to nozzle adapter
bracket with screw using a 5/16" nut driver (see Figure 12).
Torque 8 to 15 in-lbs (.90 to 1.69 N-m) 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 (see Fig-
ure 11, page 8).
12. Replace side cover (see Figure 10, page 8).
13. Connect and route fuel line hose and air line hose to nozzle
adapter assembly. See Fuel and Air Line Replacement and
Proper Routing, page 10.
14. Replace photocell in photocell bracket. Route wires as shown in
either (see Figure 13).
15. Replace fan (see page 7).
16. Replace fan guard and upper shell (see page 7).
Ignitor Element
Photocell
Bracket
Combustion
Nozzle Adapter
Chamber
Bracket Opening
Figure 12 - Ignitor Replacement
112846-01A
Ignitor
Nozzle Adapter
Bracket
For more information, visit www.desatech.com
For more information, visit www.desatech.com
SERVICE PROCEDURES
NOZZLE ASSEMBLY
1. Remove upper shell (see Upper Shell Removal, page 7).
2. Remove fan (see Fan, page 7).
3. Remove fuel and air line hoses from nozzle assembly (see Fig-
ure 13).
4. Turn nozzle assembly 1/4 turn to left and pull toward motor to
remove (see Figure 14).
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 15, page 10).
7. Blow compressed air through face of nozzle. This will free
any dirt in nozzle area.
8. Inspect nozzle sleeve for damage.
9. Replace nozzle into nozzle adapter until nozzle seats. Tighten
1/3 turn more using 5/8" socket wrench 40 to 45 in-lbs (4.5 to
5.1 N-m). See Figure 15, page 10.
10. Attach nozzle assembly to burner strap (see Figure 14).
Combustion
Chamber
Nozzle
Adapter
Bracket
Photocell
Bracket
Air Line
Hose
Figure 13 - Removing Air and Fuel Line Hoses
Combustion
Chamber
Figure 14 - Removing Nozzle/Adapter Assembly
9 9
Nozzle/Adapter
Assembly
Fuel Line Hose
Nozzle/Adapter
Assembly