Desa BTU/HR - Manual (Page 12)

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SERVICE PROCEDURES
Continued
NOZZLE ASSEMBLY
(For 40/50/55/60/70/110/115/155/165
Models Only)
1. Remove upper shell (see Upper Shell Re-
moval, page 9).
2. Remove fan (see Fan, page 9).
3. Remove fuel and air line hoses from nozzle
assembly (see Figure 23 or 24).
4. Turn nozzle assembly 1/4 turn to left and pull
toward motor to remove (see Figure 25).
Nozzle/
Adapter
Assembly
Combustion
Chamber
Air Line
Hose
Figure 23 - Removing Air and Fuel Line
Hoses (40/50/55/60/70 Models Only)
Fuel Line Hose
Air Line
Hose
Nozzle
Adapter
Bracket
Nozzle/
Adapter
Assembly
Combustion
Chamber
Photocell
Bracket
Nozzle
Adapter
Bracket
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 26).
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 4.5 to 5.1 N-m (40 to 45 in-lbs). See
Figure 26.
10. Attach nozzle assembly to burner strap (see
Figure 25).
11. Attach fuel and airline hoses to nozzle assem-
bly. See Fuel and Airline Replacement and
Proper Routing, page 14.
12. Replace fan (see Fan, page 9).
13. Replace fan guard and upper shell (see Upper
Shell Removal, page 9).
Figure 24 - Removing Air and Fuel Line
Hoses (110/115/155/165 Models Only)
Fuel
Line
Hose
Photocell
Bracket
Figure 25 - Removing Nozzle/Adapter
Assembly
Nozzle/
Adapter
Assembly
Combustion
Chamber
Figure 26 - Nozzle and Nozzle Adapter
Nozzle Face
Nozzle
Nozzle Sleeve
Nozzle Adapter
Air Line
Fitting
Fuel Line Fitting