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11
099507
OWNER’S MANUAL
Figure 9 - Replacing Nozzle
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.
Pump Pressure Adjustment
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).
Figure 10 - Adjusting Pump Pressure
Model Pump Pressure
350,000 Btu/Hr 100 PSI
600,000 Btu/Hr 110 PSI
Continued
Spark
Plug
Burner
Head
Fuel
Line
Solenoid
Valve
Plug
Nozzle
Spark
Plug
Wire
Figure 11 - Location of Screw on Flange
Clamp
Hex Screw
On Flange
Clamp
Figure 12 - Turning Fan with Hand
psi
Pressure
Gage
Fuel Pump Port
Marked “GAGE”
Fuel Pump Port
Marked “PRESS
ADJ”
SERVICE
PROCEDURES
Continued
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.”