Velleman WHPC01 - Manual (Page 5)

WHPC01 Rev 03
27.04.2010 ©Velleman nv 5
Nozzle Cleaning
A clogged or partially clogged nozzle can cause a significant reduction in the quantity of water coming out of the
nozzle and may cause the unit to pulsate while spraying.
• Turn off and unplug the unit.
• Turn off the water supply. Relieve any pressure trapped in the hose by squeezing the trigger 2-3 times
• Separate the lance from the gun.
• Rotate the nozzle to the narrow stream setting.
• Use the included tip cleaner or a thin metal object to insert the wire into the nozzle hole and move it back and
forth until the debris is dislodged (see fig. B4).
• Remove additional debris by back-flushing water through the nozzle. To do this, place end of a garden hose
(with the water running) to the end of the nozzle for 30-60 seconds.
Angle to the Target Surface
When spraying water against a surface, maximum impact is generated when the water strikes the surface “head
on.” However, this type of impact tends to cause dirt particles to imbed in the surface instead of removing them.
The optimum spraying angle is 45 degrees.
Distance to the Target Surface
Another factor that determines the impact force of the water is the distance from the spray nozzle to the target
surface. The impact force of the water is increased as the nozzle is moved closer to the surface.
Avoiding Damage to the Target Surface
Damage to target surfaces occurs because the impact force of the water exceeds the durability of the surface.
That impact force is determined by the fan pattern and the distance and angle to the target surface. Never use a
narrow high-impact stream or a turbo nozzle (not incl.) on a surface that is susceptible to damage. Avoid
spraying windows with a narrow high impact stream or turbo nozzle (not incl.) as this may cause breakage.
Follow this procedure to avoid damage to target surfaces:
• Before triggering the gun, adjust the nozzle to a wide fan pattern
• Respect a min. distance of 1.5m to the target surface and use a spray angle of ± 45°
• Vary the pattern spray angle and the distance to the target surface slightly until optimum cleaning efficiency is
achieved without damaging the surface
Turbo nozzle (not incl.)
A turbo nozzle, sometimes referred to as a rotary nozzle, is a very effective tool that can significantly reduce
cleaning time. The turbo nozzle combines the power of a narrow high-impact stream with the efficiency of a 25°
fan pattern. This swirls the narrow high-impact stream into a cone shape that cleans a larger area.
CAUTION:
Since a turbo nozzle uses a narrow high-impact stream, you should only use it target surfaces that cannot be
damaged by this type of spray. Also, the turbo nozzle is NOT adjustable and cannot be used to apply detergent.
Detergents
The use of detergents can dramatically reduce cleaning time and assist in the removal of difficult stains. Some
detergents have been customised for pressure cleaner use on specific cleaning tasks. These detergents are
approximately as thick as water. The use of thicker detergents, such as dish soap, will clog the chemical injection
system and prevent the application of the detergent. The cleaning power of detergents comes from applying
them to a surface and giving the chemicals time to break down the dirt and grime. Detergents work best when
applied at low pressure. The combination of chemical action and high-pressure rinsing is very effective. On
vertical surfaces you should start applying the detergent at the bottom and work your way up. This will prevent
the detergent from running down and causing streaks. High-pressure rinsing should be handles the same way. In
case of particularly tough stains it may be necessary to use a brush in combination with detergents and high-
pressure rinsing.
6. Operation
Follow the procedure below for maximum efficiency in the shortest amount of time. Remember to use the
techniques outlined under “Preparations”.
Surface Preparation
Take the necessary precautions before you start: leave your car, garden furniture, etc. at a safe distance. Make
sure all windows and doors are closed tight. In addition, protect all plants and trees near the target area from
contact with the detergent.
Initial high-pressure Rinse
The next step is to spray the target surface with water to clear off any dirt or grime that may have collected
there. This will allow your detergent to attack the 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 to the desired spray pattern. This
will help you avoid applying too much concentrated spray to the surface, which could cause damage.
Detergent Application (see fig. B6)
NOTE: Use only detergents formulated for pressure washes. Test the detergent in an inconspicuous area before
use.
Respect the detergent manufacturer’s label directions to determine the correct detergent-to-water mixing ratio (it
will be ± 1 to 19 or 5.5%).