Desa Master B 35 CED Manuel D'utilisation page 9

(see fi gure 19)
A. Pressure gauge
NOZZLE -
(35,000 Btu/Hr Model)-
1. Remove upper shell (see page 4).
2. Remove fan (see page 5).
3. Remove fuel and air line hoses from nozzle assembly.
4. Turn nozzle assembly 1/4 turn to left and pull toward motor to
remove.
5. Place plastic hex-body into vise and lightly tighten.
6. Carefully remove nozzle from the nozzle adapter using 5/8"
socket wrench.
7. Blow compressed air through face of nozzle. This will free any
dirt in nozzle area.
8. Inspect nozzle seal 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).
10.Attach nozzle assembly to burner strap.
11.Attach fuel and airline hoses to nozzle assembly. See Fuel
and Airline Replacement and Proper Routing see page 4.
12.Replace fan (see page 5).
13.Replace fan guard and upper shell.
(see fi gure 20, 21)
A. Combustion Chamber, B. Burner strap, C. Nozzle assembly
D. Fuel line hose, E. Air line hose.
(see fi gure 22)
A. Nozzle face, B. Nozzle seal, C. Fuel line fi tting, D. Air line
fi tting, E. Nozzle adapter, F. Nozzle
NOZZLE -
(70/100/150,000 Btu/Hr Models)-
1.Remove upper shell (see page 4).
2.Remove fan (see page 5).
3.Remove fuel and air line hoses from burner head.
4.Remove spark plug wire from spark plug.
5.Remove spark plug from burner head using 13/16" open-end
wrench.
6.Remove three screws using 5/16" nut-driver and remove
burner head from combustion chamber.
7.Place burner head into vise and lightly tighten.
8.Carefully remove nozzle from burner head using 5/8" socket
wrench (see Figure 24).
9.Blow compressed air thru face of nozzle. This will free any dirt
in nozzle area.
10.Inspect nozzle seal for damage.
11.Replace nozzle into burner head and tighten fi rmly (9.1-12.4
n-m/80-110 inch-pounds).
12.Attach burner head to combustion chamber.
13.Install spark plug in burner head.
14.Attach spark plug wire to spark plug.
15.Attach fuel and airline hoses to burner head.
16.Replace fan (see page 5).
17.Replace fan guard and upper shell.
(see fi gure 23)
A. Combustion Chamber, B. Burner head, C. Spark plug wire
D. Spark plug, E. Fuel line hose, F. Air line hose, G. Screw
(see fi gure 24)
A. Nozzle face, B. Nozzle seal, C. Foel line fi tting, D. Air line
fi tting, E. Burner head, F. Nozzle
PUMP ROTOR
(Procedure if Rotor is Binding)
1. Remove upper shell (see page 4).
2. Remove fi lter end cover screws using5/16" nut-driver.
SERV I CE PROCEDU RES
3. Remove fi lter end cover and air fi lters.
4.Remove pump plate screws using 5/16"nut-driver.
5. Remove pump plate.
6. Remove rotor, insert, and blades.
7. Check for debris in pump. If debris is found, blow out with
compressed air.
8.Install insert and rotor.
9. Check gap on rotor. Adjust to .076/.101 mm (.003"/.004") if
needed (see Figure 25).
Note: Rotate rotor one full turn to ensure the gap is .076/.101
mm (.003"/.004") at tightest position. Adjust if needed.
10.Install blades, pump plate, air fi lters and fi lter end cover.
11.Replace fan guard and upper shell.
12.Adjust pump pressure (see page 4).
Note: If rotor is still binding, proceed as follows.
13.Perform steps 1 through 6 above.
14.Place fi ne grade sandpaper (600 grit) on fl at surface. Sand
rotor lightly in "fi gure 8" motion four times (see Figure 26)
15.Reinstall insert and rotor.
16.Perform steps 10 through 12 above.
(see fi gure 25, 26)
A.Blade, B.Pump plate, C.Air intake fi lter, D.Filter end cover
E.Fan guard, F.Air output fi lter, G.Rotor, H.Insert.
(see fi gure 27)
A. gap adjusting screw, B. .076/.101 mm (.003"/.004") Gap
Measured With Feeler Gauge, C. Blade
(see fi gure 28)
A. sandpaper
FAN
IMPORTANT: Remove fan from motor shaft before removing
motor from heater. The weight of the motor resting on the fan
could damage the fan pitch.
1. Remove upper shell (see page 4).
2.Use 1/8" allen wrench to loosen setscrew which holds fan to
motor shaft.
3. Slip fan off motor shaft.
4. Clean fan using a soft cloth moistened with kerosene or
solvent.
5. Dry fan thoroughly.
6. Replace fan on motor shaft. Place fan hub fl ush with end of
motor shaft (see Figure 28).
7. Place setscrew on fl at of shaft. Tighten setscrew fi rmly 4.5 to
5.6 N-m (40 to 50 in-lbs).
8. Replace fan guard and upper shell.
(see fi gure 29, 30)
A.Fan, B.Motor shaft, C.Set screw, D. Flush.
5
GB