Pressure Washers
Operation (Continued)
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 ).
Nozzle 
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.
| Figure 17 - Optimum angle to cleaning | |
Figure 14 - Adjusting nozzle for fan pattern | ||
surface |
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.
Figure 15 - Narrow high impact stream
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
3.Vary the fan pattern spray angle and the distance to the cleaning surface until optimum cleaning efficiency is achieved without damaging the surface.
Figure 16 - Wide fan pattern
www.chpower.com
7