Desa B350D, B600D Pump Pressure Adjustment, Procedure if Pump is Binding, Service Procedures

OWNER’S MANUAL

SERVICE PROCEDURES

Continued

Nozzle

Plug

Burner

Head

Figure 9 - Replacing Nozzle

Pump Pressure Adjustment

Spark

Plug

Spark

Solenoid Plug

Valve Wire

Fuel

Line

PUMP

(Procedure if Pump is Binding)

1.Remove upper shell (see page 10).

2.Loosen hex screw on flange clamp at rear of motor with 5/16" nut-driver (see Figure 11).

3.Turn fan with hand (see Figure 12).

4.If fan turns freely, tighten screw on flange clamp.

5.If fan does not turn freely, replace pump.

6.Replace upper shell.

Hex Screw

On Flange

Clamp

1.Remove pressure gage plug from fuel pump port marked “GAGE.”

2.Install accessory pressure gage (part number M4574) to fuel pump port marked “GAGE” (see Figure 10).

Pressure

Gage

3.Start heater (see Operation, page 5). Allow motor to reach full speed.

4.Adjust pressure. Use small flat blade screwdriver to turn slotted screw at fuel pump port marked “PRESS ADJ.” Turn screw clockwise to increase pressure. Turn screw counterclockwise to de- crease pressure. See specifications at right for correct pressure for each model.

5.Stop heater (see page 5).

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

Figure 11 - Location of Screw on Flange Clamp

Fuel Pump Port	Fuel Pump Port
	Marked “PRESS
Marked “GAGE”	ADJ”
Model	Pump Pressure
350,000 Btu/Hr	100 PSI
600,000 Btu/Hr	110 PSI

Figure 10 - Adjusting Pump Pressure

Figure 12 - Turning Fan with Hand

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