Velleman WHPC03 - Manual (Page 5)

WHPC03 Rev 03
27.04.2010 ©Velleman nv 5
5. Preparations
Adjusting the Fan Pattern
• The angle of the spray coming out of the lance may be adjusted on some lances by rotating the nozzle.
This will vary the spray pattern from approximately a 0° high-impact stream to a 60° fan spray (see
fig. B1).
• A narrow stream exerts a high impact force on the target surface and results in maximum deep
cleaning in a concentrated area. However, this narrow high- impact spray must be used cautiously, as
it may damage some surfaces (fig. B2).
• 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 (fig. B3).
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 Lance (incl.)
A turbo lance, sometimes referred to as a rotary lance, is a very effective tool that can significantly
reduce cleaning time. The turbo lance 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 lance 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 lance 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.