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Pressure Washers
Spray the cleaning surface with water to clear off any dirt or
grime that may have collected on the surface. Doing so allows
the detergent to attack the deep down dirt that has worked its
way into the cleaning surface. Before triggering the gun, adjust
the nozzle to a wide fan pattern and slowly adjust it to the
desired spray pattern. Using a wide fan pattern helps you avoid
applying too much concentrated spray to the surface which can
cause damage.
ADJUSTING FAN PATTERN
Adjust the angle of spray coming out of the lance by rotating
the nozzle. The spray pattern will vary from a 0˚ narrow high
impact stream to a 60˚ wide fan spray (See Figure 14 ).
A narrow stream has high impact force on the cleaning
surface and results in maximum deep cleaning in a
concentrated area. However, this narrow high impact spray
can damage some surfaces so use it cautiously (Not
recommended for use on automotive paint and trim, or vinyl
siding).
A wide fan pattern will distribute the impact of the water
over a larger area resulting in excellent cleaning action with
a reduced risk of surface damage. Clean large surface areas
quickly using a wide fan pattern.
ANGLE TO THE CLEANING SURFACE
When spraying water against a surface, you can generate
maximum impact by striking the surface head on. However,
this type of impact can cause dirt particles to embed
in the surface and can prevent the desired cleaning action.
The optimum angle for spraying water against a cleaning
surface is 45 degrees.
Spray water against a surface at a 45 degree angle to achieve
the most beneficial impact force and to efficiently remove
debris.
DISTANCE FROM CLEANING SURFACE
The distance between the spray nozzle and the cleaning surface
is another factor that affects the impact force of the water. The
impact force of the water increases as the nozzle is moved
closer to the surface.
HOW TO AVOID DAMAGING SURFACES
Damage to cleaning surfaces occurs because the impact force of
the water exceeds the durability of the surface. You can vary the
impact force by controlling the nozzle’s fan pattern, the nozzle’s
angle to the cleaning surface, and the nozzle’s distance from the
cleaning surface. Never use a narrow high impact stream or a
Turbo/rotary nozzle on a surface that is susceptible to damage.
Avoid spraying windows with a narrow high impact stream or
turbo nozzle. Doing so may break the window. The most sure
way to avoid damaging surfaces is to follow these steps:
1. Before triggering the gun, adjust the nozzle to a wide fan
pattern.
2. Place the nozzle approximately 4-5 feet away from the
cleaning surface. Then hold the nozzle at a 45 degree angle
to the cleaning surface. Trigger the gun.
3. Vary the fan pattern spray angle and the distance to the
cleaning surface until optimum cleaning efficiency is
achieved without damaging the surface.
7
Operation (Continued)
3. Initial High Pressure Rinse
Figure 14 - Adjusting nozzle for fan pattern
Nozzle
Figure 15 - Narrow high impact stream
Figure 16 - Wide fan pattern
Figure 17 - Optimum angle to cleaning
surface
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