Pump Pressure Adjustment; Fuel Filter; Spark Plug - Desa 150,000Btu/Hr Ower's Manual

SERVICE
PROCEDURES
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 5).
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.
Correct Pump Pressure
70,000 Btu/Hr Model: 4.0 PSI
110,000 Btu/Hr Model: 4.5 PSI
150,000 Btu/Hr Model: 5.0 PSI
165,000 Btu/Hr Model: 5.4 PSI
5. Remove pressure gauge. Replace pres-
sure gauge plug in filter end cover.
(110,000 150,000 and
165,000 Btu/Hr Models
Shown)
Figure 7 - Pressure Gauge Plug Removal
(110,000 150,000 and
165,000 Btu/Hr Models
Shown)
Figure 8 - Adjusting Pump Pressure
103301

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 (110,000, 150,000 and
165,000 Btu/Hr models only) out of
fuel tank.
5. Wash fuel filter with clean fuel and re-
place in tank.
6. Attach upper fuel line to fuel filter neck.
7. Replace side cover.
Fuel Filter
Side Cover
70,000 Btu/Hr Model
Relief Fuel Filter,
Valve Bushing, and
Lower Fuel Line
Location
Pressure
Gauge Plug
Pressure
Side Cover
Gauge
110,000 150,000 and 165,000 Btu/Hr
Figure 9 - Fuel Filter Removal
OWNER'S MANUAL
Upper Fuel Line
Upper Fuel Line
Models
9

SPARK PLUG

1. Remove upper shell (see page 8).
2. Remove fan (see page 8).
3. Remove spark plug wire from spark plug.
4. Remove spark plug from burner head
using 13/16" open-end wrench.
5. Clean and regap spark plug electrodes
as follows:
70,000 Btu/Hr Model – .055" gap
110,000 and 150,000 Btu/Hr Models
– .075" gap
165,000 Btu/Hr Model – .085" gap
6. Install spark plug in burner head.
7. Attach spark plug wire to spark plug.
8. Replace fan (see page 8).
9. Replace fan guard and upper shell.
Burner
Head
Spark
Plug
Figure 10 - Spark Plug Removal
Bend Here to Adjust Gap
Figure 11 - Spark Plug Gap
Spark Plug
Wire
Gap
Continued