Specifications

HP SERIES OPERATOR’S MANUAL
9
Shark HP • Rev. 1/03
Burner Nozzle:
Keep the tip free of surface deposits by wiping it with a
clean, solvent-saturated cloth, being careful not to plug
or enlarge the nozzle. For maximum efficiency, replace
the nozzle each season. Select nozzle size based on
the pressure washer you will be using:
Nozzle Pressure Washer GPM
1.50 2 - 3
1.75 3 - 4
2.00 - 2.25 4 - 5
All nozzles should be 45° W
Fuel Control System:
The HP utilizes a fuel solenoid valve located on the fuel
pump to control the flow of fuel to the combustion cham-
ber. This solenoid, which is normally closed, is activated
by a flow switch when water is flowing through it. When
an operator releases the trigger on the spray gun, the
flow of water through the flow switch stops, turning off
the current to the fuel solenoid. The solenoid then closes,
shutting off the supply of fuel to the combustion cham-
ber. Controlling the flow of fuel in this way gives an in-
stantaneous burn or no burn situation, thereby eliminat-
ing high and low water temperatures, and combustion
smoke normally associated with machines incorporat-
ing a spray gun. Periodic inspection is recommended to
insure that the fuel solenoid valve functions properly. This
can be done by operating the machine and checking to
see that when the trigger on the spray gun is in the off
position, the burner is not firing.
Fuel Pressure Adjustment:
To adjust fuel pressure, turn the adjusting screw with a
5/32" Allen Wrench (located on the fuel pump) clock-
wise to increase, counterclockwise to decrease. Do not
exceed 200 PSI.
FIELD REPAIR INSTRUCTIONS
HP Fuel Pump:
1. Remove the screws 10/32" Allen Head from the HP
hood.
2. Remove louvered HP hood.
3. With a 9/16" wrench, loosen (DO NOT REMOVE)
the two 3/8" x 3/4" HH NC serrated flange bolts that
secure the HP front panel.
4. With a 2.5 mm hex head wrench (Allen Wrench),
loosen the three set screws that hold the fuel pump
in the blower motor housing located on Idromatic
Boiler Assembly.
5. Carefully remove the fuel pump (Item #53) from the
blower motor, leaving the flexible zinc fuel line con-
nected, carefully bend the fuel line and fuel pump
away from the blower motor.
6. Locate the fuel pump/fan motor coupling.
7. Inspect the coupling for damage. The inside diam-
eter of fuel pump coupling requires flat on one side
to engage fuel pump, and the outside diameter re-
quires two male notches to engage the blower mo-
tor.
8. Perform a check to see if the fuel pump is turning
freely. Use an open end 7mm wrench or small ad-
justable wrench on fuel pump shaft.
9. Spin the fuel pump over in both directions using the
wrench for leverage. When the fuel pump is turning
freely (almost to the point you could turn it by hand)
it is ready to reinstall.
10. Align fuel pump coupler on pump shaft/fan motor.
Slide pump into fan motor. Secure pump with the
three set screws.
11. Test machine (make sure):
❑ Blower motor spins
❑ Fuel is on
❑ Machine has power to it
❑ Switch is on
❑ Flow of water through machine
❑ Thermostat is turned up
❑ Flow switch is adjusted properly
12. When HP is operating properly, turn machine off,
tighten front panel, and install hood and 13 self tap-
ping screws with recess washers.