Desa RM200T - Manual (Page 10)

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PORTABLE FORCED AIR HEATER
200,000 BTU/HR
NOZZLE
1. Remove upper shell (see Upper Shell
Removal, page 8).
2. Remove fan (see Fan, page 8).
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.
SPARK PLUG
1. Remove upper shell (see Upper Shell
Removal, page 8).
2. Remove fan (see Fan, page 8).
3. Remove spark plug wire from spark
plug (see Figure 12).
4. Remove spark plug and wave spring
washer from burner head using 13/16"
open-end wrench.
5. Clean and regap spark plug electrodes
to .110 gap (see Figure 13).
6. Install spark plug and wave spring
washer in burner head. Torque 40 to
60 inch-pounds. Then adjust (if nec-
essary) to bring side electrode into the
acceptable range (see Figure 14).
7. Attach spark plug wire to spark plug.
8. Replace fan (see Fan, page 8).
9. Replace fan guard and upper shell (see
Upper Shell Removal, page 8)
Figure 13 - Spark Plug Gap
Figure 12 - Spark Plug Removal
Figure 14 - Acceptable Range For Side Electrode
SERVICE
PROCEDURES
Continued
Spark
Plug
Wire
Spark
Plug
Burner
Head
Wave
Spring
Washer
Gap
Bend Here to
Adjust Gap
270˚
ACCEPTABLE RANGE
FOR SIDE ELECTRODE
Side
Electrode
Figure 15 - Removing Burner Head
Air Line Hose
Screw
Combustion
Chamber
Burner Head
Spark Plug Wire
Spark
Plug
Fuel Line Hose
Wave Spring
Washer
8. Carefully remove nozzle from burner
head using 5/8" socket wrench (see Fig-
ure 16, page 11).
9. Blow compressed air through 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 firmly (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 Fan, page 8).
17. Replace fan guard and upper shell (see
Upper Shell Removal, page 8).
270
°
Acceptable
Range For
Side
Electrode