Working Methods; Pre-Priming - Nilfisk-ALTO CONTRACTOR MASTER Instruction Manual

4.4 Working methods

Your high pressure washer has been developed for cleaning according to the so-called "2-step method".
STEP 1
STEP 2
In practice the working process is laid down in accordance with the actual job, but as a starting point the
fol low ing working method can be described for a job:
1. Apply detergent under low pressure. The dosage is chosen according to the job which is to be
carried out, and the adjustment is made on the control knob on the injector.
2. Await acting time. Let the detergent act on the dirt/surface for a short time prior to pressure clean ing
- usually a few minutes.
3. High pressure cleaning. Clean all surfaces under high pressure.
4. Rinse afterwards, if necessary. To make sure that residual impurities are removed from the sur face.
In connection with the working process the optimum cleaning will be reached by following these 3 pieces
of advice:
Advice no. 1
When using a detergent, always apply it on a dry surface. If the surface is rinsed with water at fi rst, it may
be diffi cult for it to absorb the detergent, and the result is a reduced effect of the detergent.
Advice no. 2
When applying a detergent on large vertical surfaces (i.e. the sides of a truck) work from below and up-
wards. Thus you will avoid detergent running off the surface through grooves and dark streaks appearing
on the surface whilst cleaning.
Advice no. 3
During the high pressure cleaning you should work so that the high pressure water does not run over the
surface which has not been cleaned yet. This is to ensure that there is suffi cient detergent on the surface
when the high pressure water hits the surface.
For certain cleaning tasks it may be an advantage to apply detergents for high pressure operation - i.e. for
the dewaxing of cars.

5.0 Pre-priming

The pressure washer is self-priming, and the water can be taken from a tank, a stream or the like. The
suc tion height depends on the water temperature. Max. suction height of 5 m is reached with cold water up
to 12°C. The pump and the inlet hose must be primed with water before starting up.
If there is a risk of impurities (such as running sand) in the Intel water, an external fi lter must be mounted
beyond the internal fi lter. Please contact your Nilfi sk-ALTO distributor for further in for ma ti on.
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Fields of application and working methods
Application of detergent
High pressure cleaning
EN