Desa B50G - Manual (Page 10)

10
102016
Relief
Valve
Pressure
Gauge
Plug
Continued
Pump Pressure
Adjustment
1. Remove pressure gauge plug from
filter end cover.
2. Install accessory pressure gauge
(part number HA1180).
3. Start heater (see Operation, page
6). Allow motor to reach full speed.
4. Adjust pressure. Turn relief valve
to right to increase pressure. Turn
relief valve to left to decrease
pressure. Set pump pressure at 3.4
psi.
5. Remove pressure gauge. Replace
pressure gauge plug in filter end
cover.
Spark Plug
1. Remove upper shell (see page 9).
2. Remove fan (see page 9).
3. Remove fuel and air line hoses
from nozzle assembly.
4. Remove spark plug wire from
spark plug.
5. Remove two screws using 5/16"
nut-driver and remove burner
strap.
6. Place hex-body of spark plug into
vise and tighten.
7. Remove spark plug mounting nut
using 11/16" open-end wrench.
8. Remove burner strap from spark
plug.
9. Clean and regap spark plug
electrodes to .055" gap.
10.Replace burner strap onto spark
plug. Rotate burner strap to
position spark plug electrodes (see
Figure 12, page 11).
11.Tighten spark plug with spark plug
mounting nut.
12.Release hex-body of spark plug
from vise.
Fuel Filter
1. Remove side cover screws using
5/16" nut-driver.
2. Remove side cover.
3. Pull upper fuel line off fuel filter
neck.
4. Carefully pry bushing and fuel
filter out of fuel tank.
5. Wash fuel filter with clean fuel and
replace in tank.
6. Attach upper fuel line to fuel filter
neck.
7. Replace side cover.
Figure 7 - Pressure Gauge Plug Removal
Pressure
Gauge
Figure 8 - Adjusting Pump Pressure
Bend Here
to Adjust
Gap
.055" Gap
Figure 11 - Spark Plug Gap
Figure 10 - Spark Plug Removal
Air Line
Hose
Burner
Strap
Spark Plug
Wire
Nozzle Assembly
Fuel Line Hose
Spark
Plug
Spark Plug
Mounting Nut
Combustion
Chamber
Fuel Filter
Side
Cover
Upper Fuel Line
Figure 9 - Fuel Filter Removal