www.desatech.com
118997-01B
11
SERVICE PROCEDURES
WARNING: Never service
heater while it is plugged in, op-
erating or hot. Severe burns and
electrical shock can occur. Only
a qualified service person should
service and repair heater.
UPPER SHELL REMOVAL
1. Remove screws along each side and top
of heater using 5/16" nut-driver. These
screws attach upper and lower shells
together (see Figure 5).
2. Lift upper shell off.
Figure 5 - Upper Shell Removal
FAN BLADES AND AIR
DEFLECTORS
1. Remove upper shell (see
Upper Shell
Removal
).
2. Clean fan blades and air deflectors with
clean, soft cloth moistened with kerosene
or solvent (see Figure 6).
3. Dry fan blades and air deflectors thor-
oughly.
4. Replace upper shell.
Figure 6 - Fan Blades and Air Deflectors
Fan
Blade
Air
Deflector
Figure 7 - Spark Plug Removal
Spark Plug
Wire
Spark Plug
Burner
Head
0.075"
Figure 8 - Spark Plug Gap
SPARK PLUG
1. Remove upper shell (see
Upper Shell
Removal
).
2. Remove spark plug wire from spark plug
(see Figure 7).
3. Remove spark plug from burner head using
13/16" open-end wrench (see Figure 7).
4. Replace spark plug if damaged or heavily
coated with carbon.
5. Clean and regap spark plug electrodes to
0.075" (see Figure 8).
6. Install spark plug in burner head.
7. Attach spark plug wire to spark plug.
8. Replace upper shell.
Figure 9 - Replacing Nozzle
Spark Plug
Burner
Head
Fuel Line
Solenoid Valve
Plug
Nozzle
Spark Plug
Wire
Upper Shell
NOZZLE
1. Remove upper shell (see
Upper Shell
Removal
).
2. Remove fuel line from solenoid valve us-
ing 7/16" wrench.
3. Remove spark plug wire from spark plug.
4. Remove spark plug from burner head
using 13/16" open-end wrench.
5. Remove
five screws using 5/16" nut-driver
and remove burner head from combustion
chamber.
6. Place burner head into vise and lightly
tighten.
7. Carefully remove nozzle from burner head
using 5/8" socket wrench (see Figure 9).
