Desa BTU/HR - Manual (Page 11)

www.desatech.com 113282-01C 11
SERVICE PROCEDURES
Continued
IGNITOR
1. Remove upper shell and fan guard (See Up-
per Shell Removal, page 9).
2. Remove fan (see page 9).
3. Remove 4 side cover screws with a 5/16" nut
driver. Remove side cover (see Figures 18 or
19, page 10).
4. Disconnect ignitor wires from ignition con-
trol assembly (see Figure 20). 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 20).
6. Remove combustion chamber. Stand combus-
tion chamber on end with nozzle adapter
bracket on top (see Figure 21 or 22).
7. Remove ignitor screw with a 1/4" nut driver for
models using ignitor HA1000 or 5/16" nut driver
for models using 102548-08 ignitor. Carefully
remove 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 1/4" nut driver for models us-
ing ignitor HA1000 or 5/16" nut driver for
models using 102548-08 ignitor (see Figure
23). Torque .90 to 1.69 N-m (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 (see Figure 20).
12. Replace side cover (see Figures 18 or 19,
page 10).
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 14.
14. Replace photocell in photocell bracket. Route
wires as shown in either (see Figures 23, 24
or 27, page 12).
15. Replace fan (see page 9).
16. Replace fan guard and upper shell (see page 9).
Photocell
Bracket
Ignitor
Ignitor Screw/
Washer Assembly
Nozzle
Adapter
Bracket
Ignitor
Element
Combustion
Chamber
Nozzle Adapter
Bracket Opening
Figure 21 - Ignitor HA1000 Replacement
Figure 20 - Disconnecting Ignitor Wires
from Ignition Control Assembly
Photocell
Bracket
Air Line
Hose
Fuel
Line
Hose
Combustion
Chamber
Photocell
Assembly
Ignitor
Nozzle
Adapter
Bracket
Ignition
Control
Assembly
Side Cover
Photocell
Bracket
Ignitor
Nozzle
Adapter
Bracket
Ignitor Element
Combustion
Chamber Nozzle Adapter
Bracket Opening
Figure 22 - Ignitor 102548-08 Replacement
Ignitor
Wire