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.

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.

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).

Continued

 

 

 

(35/50/55/70,000 BTU/Hr Models Shown)

 

Pressure

 

Relief

 

 

Valve

 

Gauge

 

 

 

 

 

 

 

Plug

 

 

 

 

 

 

 

Pressure

 

Figure 13 - Pressure Gauge Plug Removal Gauge

 

 

 

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

Figure 14 - Adjusting Pump Pressure

110,000

BTU/Hr

4.5 PSI

 

 

150,000

BTU/Hr

5.0 PSI

 

 

 

 

 

Fuel Filter, Bushing,

Upper

 

 

 

and Lower Fuel Line

Fuel Filter

 

 

Fuel

 

 

 

 

Line

Upper Fuel Line

 

 

 

 

Side Cover

Side Cover

 

 

Figure 15 - Fuel Filter Removal,

100 FUEL FILTER REMOVAL

PFA/P 041

Figure 16 - Fuel Filter Removal,

35/50/55/70,000 BTU/Hr Models

100/110/150,000 BTU/Hr Models

Combustion

 

Spark Plug

 

 

 

Mounting Nut

 

 

Chamber

 

Burner

Spark

 

 

 

Strap

Spark Plug

 

 

Plug

 

 

 

Wire

 

Nozzle Assembly

Air Line

Fuel Line Hose

Hose

 

Figure 17 - Spark Plug Removal, 35/50/55,000 BTU/Hr Models

Bend Here

 

to Adjust

 

Gap

 

.055" Gap

 

Figure 18 - Spark Plug Gap, 35/50/55,000 BTU/Hr Models

11

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Page 11
Image 11
Desa 000 BTU/Hr ARL, 35, 110, 000 50, 000 55, 000 70, 150, 100 owner manual Pump Pressure Adjustment, Fuel Filter, Spark Plug

100, 150, 000 70, 000, 000 55 specifications

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