Desa 110 - Manual (Page 11)

11
099176
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
7). 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. See specifications at right
for correct pressure for each model.
5. Remove pressure gauge. Replace
pressure gauge plug in filter end
cover.
Relief
Valve
Pressure
Gauge
Plug
(35/50/55/70,000 BTU/Hr Models Shown)
Figure 13 - Pressure Gauge Plug Removal
Pump
Model Pressure
35,000 BTU/Hr 3.0 PSI
50,000 BTU/Hr 3.6 PSI
55,000 BTU/Hr 3.4 PSI
70,000 BTU/Hr 4.0 PSI
100,000 BTU/Hr 4.0 PSI
110,000 BTU/Hr 4.5 PSI
150,000 BTU/Hr 5.0 PSI
Pressure
Gauge
Figure 14 - Adjusting Pump Pressure
Upper
Fuel
Line
100 FUEL FILTER REMOVAL PFA/P 041
Fuel Filter, Bushing,
and Lower Fuel Line
Figure 16 - Fuel Filter Removal,
100/110/150,000 BTU/Hr Models
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, fuel filter,
and lower fuel line (100/110/
150,000 BTU/Hr models only) 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.
Fuel Filter
Side Cover
Figure 15 - Fuel Filter Removal,
35/50/55/70,000 BTU/Hr Models
Upper Fuel Line
Side Cover
Air Line
Hose
Burner
Strap
Spark Plug
Wire
Nozzle Assembly
Fuel Line Hose
Spark
Plug
Spark Plug
Mounting Nut
Combustion
Chamber
Bend Here
to Adjust
Gap
.055" Gap
Continued
Figure 17 - Spark Plug Removal, 35/50/55,000 BTU/Hr Models
Figure 18 - Spark Plug Gap, 35/50/55,000 BTU/Hr Models
Spark Plug
(35/50/55,000 BTU/Hr Models)
1. Remove upper shell (see page 10).
2. Remove fan (see page 10).
3. Remove fuel and air line hoses
from nozzle assembly.
4. Remove spark plug wire from
spark plug.
5. Remove two (2) 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 19, page 12).