Operating instructions

9.801-509.0 - D • Karcher Operator's Manual
MANUAL
PRESSURE WASHER
26
MAINTENANCE & SERVICE
Gas Valve Regulator Adjustment
GAS VALVE REGULATOR
ADJUSTMENT
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 pressure tap port.
2. Remove regulator adjustment screw cap.
3. With a small screwdriver, rotate the adjustment
screw clockwise to increase or counterclockwise
to decrease gas pressure.
4. Replace regulator adjustment screw cap (see
Figure 5).
Figure 5
Rupture Disk
If pressure from pump or thermal expansion should
exceed safe limits, the rupture disk will burst allow-
ing high pressure to be discharged through hose to
ground. When disk ruptures it will need to be replaced.
The Rupture Disk should be replaced every two years.
PROPANE GAS
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. 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.
Gas Pressure Requirements
All propane fired machines operate on vapor propane
fuel 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.
Exterior regulators are needed to control gas pressure.
Propane bottles are not included with the machine. A
pressure regulator should be installed between pro-
pane bottle and gas valve.
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
vapor gas. As gas is used from the propane cylinder,
the liquid in the cylinder boils to maintain vapor gas
pressure. This boiling process cools the liquid, and in
a heavy, continuous-demand situation, the liquid tem-
perature can fall to the point at which it cannot provide
vapor gas as rapidly as is needed. In this case, it may
be necessary to warm the propane cylinder by direct-
ing a warm spray, not over 120°F, on the cold cylinder
or by manifolding two propane bottles together to in-
crease total vaporization capacity. It is recommended
that a minimum 100 lb. vapor 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 an Intermittent Pilot
Ignition System. This system is designed to eliminate
the need for a constant burning pilot. Lighting of the
pilot is accomplished through electronic spark ignition
each time the burner switch is turned on. Do not at-
tempt to light the appliance manually as a burn injury
or electrical shock may result. The pilot light will remain
on and the main gas valve is turned off when the spray
gun is closed.
Care of Main Burner
Due to condensation from heater coils dripping down
on the burners, scale build-up may occur in the burner
jet orifices.
1. TO REMOVE BURNER MANIFOLD FROM
WATER HEATER COIL:
Turn off the gas to the main burner by turning the
knob to the “OFF” position on the gas valve and
the main gas supply.
Disconnect the pilot and ignition lines from the gas
valve. Disconnect union in main burner line below
thermostat. Slide burner manifold out through shell
opening.
On/Off
Switch
Inlet View
Outlet
Manifold Pressure
Adjustment Screw
Under Cap
Gas Valve
Regulator
Adjustment
Lines To
Pilot Light
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