RJ45 And RJ70
PORTABLE FORCED AIR HEATERS
SERVICE
PROCEDURES
Continued
SPARK PLUG (RJ70)
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. |
4. | Remove spark plug from burner head |
| using 13/16" |
5. | Clean and regap spark plug electrodes |
9.Screw nozzle into nozzle adapter until nozzle seats. Tighten
10.Install nozzle adapter into nozzle adapter bracket.
11.Connect and route fuel line hose and air line hose to nozzle assembly. See Fuel and Air Line Replacement and Proper Routing, page 10.
12.Replace fan (see Fan, page 8).
13.Replace fan guard and upper shell (see Upper Shell Removal, page 8).
FUEL AND AIR LINE
REPLACEMENT AND
PROPER ROUTING
1. | Remove upper shell (see Upper Shell |
| Removal, page 8). |
2. | Remove side cover screws using 5/16" |
| nut driver (see Figure 9, page 9). |
3. | Remove side cover. |
4. | Inspect fuel and air line hoses for cracks |
| and/or holes. If fuel line hose is dam- |
| aged, disconnect from nozzle adapter or |
| burner head (see Figure 14 or Figure 18, |
| to 2.2 mm. |
6. | Install spark plug in burner head. |
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). |
Burner | Spark Plug Wire |
Head |
|
Combustion Chamber
Fuel Line
Hose
Air Line
Hose
Nozzle
Adapter
Ignitor and
Photocell wires
through this hole
page 11) and from fuel filter (see Fuel |
Filter, page 9). If air line hose is dam- |
aged, disconnect from nozzle adapter or |
burner head (see Figure 14 or Figure 18, |
page 11) and from barb fitting on pump |
end cover (see Figure 17). |
5. Install new air and/or fuel line. Attach |
one end of air line hose to barb fitting |
on pump end cover (see Figure 17) and |
the other end to nozzle adapter or |
burner head (see Figure 14 or Figure |
18, page 11). Attach one end of fuel line |
hose to fuel filter (see Fuel Filter, page |
Spark Plug
Figure 12 - Spark Plug Removal
Bend Here to Adjust Gap
Gap 
2.2 mm
Figure 13 - Spark Plug Gap
Figure 14 - Removing Air and Fuel Line Hoses
Combustion
Chamber
Nozzle |
| |
Adaptor | Nozzle | |
Bracket | ||
Adapter | ||
|
9) and the other end to nozzle adapter |
(see Figure 14 or Figure 18, page 11). |
Route air and fuel line approximately |
as shown in Figure 14 (RJ45) or 18 |
(RJ70), page 11. |
Note: Hoses are not to touch photocell bracket.
6.Replace side cover.
7.Replace upper shell and fan guard (see Upper Shell Removal, page 8).
NOZZLE (RJ45)
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 nozzle adapter.
4.Turn nozzle adapter 1/4 turn to left and pull toward motor to remove.
5.Place nozzle adapter into vise and lightly tighten.
6.Carefully unscrew 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.
Figure 15 - Removing Nozzle Assembly
Nozzle Face
Nozzle Seal
Nozzle
Nozzle Adapter 
Air Line
Fitting 
Fuel Line
Fitting
Figure 16 - Nozzle and Nozzle Adapter
Pump End Cover
Barb
Fitting
Air Hose
Figure 17 - Air Hose to Barb Fitting
10 | 104950 |
