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PRESSURE WASHER
TERMINOLOGY
psi: Pounds
per
Square Inch.
The
unit
of
measure
for
water
pressure.
Also
used for
air pressure,
hydraulic
pres-
sure,
etc.
GPM
:
Gallons
Per
Minute.
The unit
of
measure
for
the flow rate of
water.
CU:
Cleaning
Units.
GPM multiplied
by psi. GPM x psi
=
CU
Bypass
Mode:
Allows water
to
re-circulate
within pump when the gun
trigger
is not
pulled.
CAUTION:
Allowing
the
unit
to
run for more
than
two
minutes
without
the
gun
trigger
pulled
could
cause
overheating
and
damage to the
pump.
Thermal
Relief Valve
(not shown)
When
the
temperature
inside
the
pump
rises
too
high the valve
will
open and release
a
gush of water in
an effort
to
lower
the
temperature
inside the
pump. The valve
will
then
close.
Chemical Injection System
:
Mixes
cleaners or cleaning solvents
with
the
water
to improve
cleaning
effectiveness.
Water
Supply:
All
pressure
washers
must have
a source
of
water.
The
min-
imum
requirements
for
a
water supply
are
20 psi and
5
gallons
per
minute.
PRESSURE WASHER OPERATING
FEATURES
Pressure Adjustments
The
pressure
setting
is
preset at the
fac-
tory to
achieve optimum pressure and
cleaning.
If you need to lower
the
pres-
sure,
it
can
be
accomplished
by
these
methods.
1.
Back away
from
the surface
to
be
cleaned. The
further
away
you
are,
the less
the
pressure
will
be
on
the
surface
to
be cleaned.
2.
Rotate
the
nozzle
at
the end
of
the
multi-adjustable spray
wand
to widen
the
fan
spray.
19
The wider fan
spray
will
minimize
the pressure on
the surface
to
be cleaned.
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