Desa KEROSENE HIGH PRESSURE PORTABLE FORCED AIR HEATERS owner manual Service Procedures, Continued

SERVICE PROCEDURES

Continued

8.Inspect nozzle for damage. If damaged or clogged, replace nozzle.

9.Make sure plug is in place on burner head.

10.Replace nozzle into burner head and tighten firmly (175-200 inch-pounds).

11.Attach burner head to combustion chamber.

12.Install spark plug in burner head.

13.Attach spark plug wire to spark plug.

14.Attach fuel line to solenoid valve. Tighten firmly.

15.Replace upper shell.

PUMP PRESSURE ADJUSTMENT FOR HEATERS WITH FUEL FILTER/ CANISTER EXTERNAL TO PUMP

1.Remove pressure gauge plug from fuel pump port marked “GAUGE.”

2.Install accessory pressure gauge (part num- ber 110380-01) to fuel pump port marked “GAUGE” (see Figure 11).

3.Start heater (see Operation, page 4). Allow motor to reach full speed.

4.Adjust pressure. Use small flat blade screw- driver to turn slotted screw at fuel pump pres- sure adjusting port. Turn screw clockwise to increase pressure. Turn screw counterclockwise to decrease pressure. See specifications in Fig- ure 11 for correct pressure for each model.

5.Stop heater (see page 5).

6.Remove pressure gauge. Replace pres- sure gauge plug in fuel pump port marked “GAUGE.”

Model	Pump Pressure
350,000 Btu/Hr	100 PSI
600,000 Btu/Hr	110 PSI

PUMP PRESSURE ADJUSTMENT FOR HEATERS WITH FUEL FILTER INTERNAL TO PUMP

1.Remove pressure gauge plug from fuel pump port marked “GAUGE.”

2.Install accessory pressure gauge (part number 110380-01) to fuel pump port marked “GAUGE” (see Figure 12). Do not use bleeder valve port to check the pressure. The bleeder valve port contains pressure higher than operating pressure. Setting pump pressure with gauge in the bleeder valve port results in wrong operating pressure.

3.Start heater (see Operation, page 4). Allow motor to reach full speed.

4.Adjust pressure. Use small flat blade screw- driver to turn slotted screw at fuel pump port at top right side of pump. Turn screw clockwise to increase pressure. Turn screw counterclockwise to decrease pressure. See specifications in Figure 12 for correct pressure for each model.

5.Stop heater (see page 5).

6.Remove pressure gauge. Replace pres- sure gauge plug in fuel pump port marked “GAUGE.”

Model	Pump Pressure
350,000 Btu/Hr	100 PSI
600,000 Btu/Hr	110 PSI
Pressure	psi
Gauge
Fuel Pump
Port Marked
“GAUGE”

Pressure

Gauge

psi

Fuel Pump Port

Marked “GAUGE”

Pressure

Adjustment Port

Figure 12 - Adjusting Pump Pressure

Fuel Pump

Port Marked

“PRESS ADJ”

Figure 11 - Adjusting Pump Pressure

110098-01F www.desatech.com 11