Shark HNG • 9.801-195.0 • Rev. 4/14
OPERA
TOR’S MANU
AL
PRESSURE
W
ASHER
18
Gas Valve Adjustment
98011950-25
ON/OFF
Switch
Line to Pilot
Light
Outlet
View
Manifold Pressure
Adjustment Screw
Under Cap
Inlet
View
Line to
Pilot
Light
Gas Valve Regulator Adjustment:
(See Fig. 5)
Adjustment of the built-in regulator isn’t normally nec-
essary, since it is preset at the factory. However, field
adjustment may be accomplished as follows:
1. Attach manometer at both inlet and outlet pressure
ports.
2. Remove manifold pressure adjustment screw cap.
3 . With small screwdriver, rotate manifold pres-
sure adjustment screw clockwise to increase or
counterclockwise to decrease gas pressure.
4. Replace manifold pressure adjustment screw cap.
Figure 5
Pilot Burner Adjustment:
1. Remove pilot adjustment cap.
2. Adjust pilot key to provide properly sized flame.
3. Replace pilot adjustment cap.
Rupture Disk:
If pressure from pump or if thermal expansion should
exceed safe limits, the rupture disk will burst, allowing
high pressure to be discharged through hose to ground.
When the disk ruptures, it will need to be replaced.
PROPANE GAS
(Vapor Fuel Only)
General Safety Precautions:
Have a qualified gas service person assist in any gas
burner installation or service. Few maintenance people
or mechanics are knowledgeable in gas controls or
related safety practices. Since propane gas is heavier
than air, unburned propane gas will gravitate to the floor
rather than rise out of the stack. Hence, adequate floor
space and good ventilation are especially important with
propane systems.
MAINTENANCE & SERVICE
Gas Pressure Requirements:
All propane fired machines operate on gas vapor only.
They are designed to operate at a pressure of 11
w.c.i. (between 1/3 and 1/2 of one PSI), and are often
operated at even higher pressures when extra heat is
needed, please see Installation Instructions.
Exterior regulators are needed to control the system.
Propane bottles are not included with the machine.
A high pressure regulator should be installed on the
propane bottle and a low pressure regulator attached
to the pressure washer.
Propane Cylinder Capacity:
An important consideration with propane systems is the
capacity of the supply cylinder relative to the needs of
the burner. The burner operates on propane as a gas.
As gas is used from the propane cylinder, the liquid in
the cylinder boils to maintain gas pressure. This boiling
process cools the liquid, and in a heavy, continuous-
demand situation, the liquid temperature can fall to
the point at which it cannot provide gas as rapidly as
is needed. In this case, it may be necessary to warm
the propane cylinder by directing a warm spray, not
over 120°, on the cold cylinder, or by manifolding two
propane bottles together to increase total vaporization
capacity. It is recommended that a minimum 100 lb.
propane bottle be used on the machine, depending on
the length of running time desired.
BURNER FEATURES
Operated Automatic Valve:
This machine is equipped with a thermopile self-pow-
ered combination gas control. This system is designed
as a constant burning pilot. Lighting of the pilot is ac-
complished by manually lighting the pilot. A thermostat
and flow switch control the main solenoid valve.
Care of Main Burner:
Because of condensation from the heater coils dripping
down on the burners, scale buildup may occur in the
burner jet orifices.
1
.
TO REMOVE BURNER MANIFOLD FROM
WATER HEATER COIL:
Turn off the gas at the main burner by turning the
knob to the “OFF” position on the gas valve and
main gas supply.
Disconnect the pilot and ignition lines from the
gas valve. Disconnect union in main burner line.
(Remove the nuts from the U-bolts, item 21 on
page 31). Slide burner manifold out through shell
opening.
