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

SERVICE
PROCEDURES
Continued
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
(see Figure 10, page 8).
4. Disconnect ignitor wires (black) from
ignition control assembly (see Figure
12). 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 12).
6. Remove combustion chamber. Stand
combustion chamber on end with
nozzle adapter bracket on top (see Fig-
ure 13).
7. Remove ignitor screw with a 1/4" nut
driver. Carefully remove ignitor from
nozzle adapter bracket.
CAUTION: Do not bend or strike
ignitor element. Handle with care.
8. Carefully remove replacement ignitor
from styrofoam packing.
9. Carefully guide ignitor into opening in
nozzle adapter bracket. Do not strike
ignitor element. Attach ignitor to
nozzle adapter bracket with screw us-
ing a 1/4" nut driver (see Figure 13).
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 10,
page 8).
13. Connect and route fuel line hose and
air line hose to nozzle assembly (see
Figure 14).
14. Replace photocell in photocell bracket.
15. Replace fan (see page 7).
16. Replace fan guard and upper shell (see
page 7).
107325
Combustion
Chamber
Air
Line
Hose
Fuel
Line
Hose
Photocell
Bracket
Photocell
Assembly
Side Cover
Figure 12 - Disconnecting Ignitor Wires
from Ignition Control Assembly
Ignitor Screw
Ignitor
Element
Photocell
Bracket
Nozzle Adapter
Bracket Opening
Combustion
Chamber
Figure 13 - Ignitor Replacement
NOZZLE ASSEMBLY
1. Remove combustion chamber and ig-
nitor by following steps 1 through 7
under Ignitor, column 1.
2. Carefully place the ignitor in a safe lo-
cation.
3. Remove two nozzle adapter bracket
screws (see Figure 14).
9
• SERVICE PROCEDURES
Nozzle
4. Place hex-shaped aluminum nozzle
Adapter
adapter into vise (do not overtighten).
Bracket
5. Carefully remove nozzle from nozzle
adapter using 5/8" socket wrench (see
Ignitor
Figure 15).
Ignitor
6. Blow compressed air through face of
Wires
nozzle. This will remove any debris
in nozzle.
7. Inspect nozzle seal for damage.
8. Replace nozzle into nozzle adapter un-
til nozzle seats. Tighten 80-110 inch-
pounds.
9. Attach nozzle adapter bracket to com-
Ignition
bustion chamber with two screws re-
Control
moved in step 3.
Assembly
10. Repeat steps 9 through 16 under Igni-
tor, column 1.
Combustion
Chamber
Nozzle
Adapter
Bracket
Washer
Photocell
Ignitor
Bracket
Nozzle
Adapter
Bracket
Air Line
Hose
Figure 14 - Removing Air and Fuel Line
Hoses
Nozzle Face
Nozzle
Nozzle
Adapter
Bracket
Figure 15 - Nozzle and Nozzle Adapter
For more information, visit www.desatech.com
Nozzle
Adapter
Bracket
Screw
Nozzle/
Adapter
Assembly
Fuel Line
Hose
Nozzle
Adapter
Nozzle
Seal
Air Line
Fitting Fuel Line
Fitting
Continued