Delta D28623 - Manual (Page 11)

11- ENG D28623
PRESSURE WASHER TERMINOLOGY
PSI: Pounds per Square Inch. The unit of measure for water pressure. Also used
for air pressure, hydraulic pressure, etc.
GPM: Gallons Per Minute. The unit of measure for the flow rate of water.
CU: Cleaning Units. GPM multiplied by PSI.
Bypass Mode: In Bypass Mode, the pump is recirculating water because the
trigger of the spray gun is not pulled. If unit is left in bypass mode for more than
two (2) minutes, the water temperature will rise to a dangerous level and could
damage internal components of the pump. Any damage to pump due to these
causes will not be covered under warranty.
DO NOT allow your unit to operate in bypass mode for more
than two minutes at any time. Overheating of pump can
cause damage to pump.
Thermal Relief Valve: In an effort to prevent extreme damage, pumps are
equipped with a thermal relief valve. This valve will open when the temperature
inside the pump rises too high. This valve will then release a gush
of water in an effort to lower the temperature inside the pump.
Immediately after this occurs, the valve will close.
Chemical Injection System: Mixes cleaners or cleaning solvents
with the pressurized water to improve cleaning effectiveness.
Water Supply: All pressure washers must have a source of water.
The minimum 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 factory to achieve optimum pressure and
cleaning. If you need to lower the pressure, 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. Change to the 40º nozzle - white, this nozzle delivers a less powerful
stream of water and a wider spray pattern.
DO NOT attempt to increase pump pressure. A higher
pressure setting than the factory set pressure may damage
pump.
3. Adjust the pressure regulator on the pump. Turn
the pressure regulator knob counterclockwise to
lower pressure. Refer to the illustrations to identify
your pressure regulator. Once you have finished
using your pressure washer, return the pressure regu-
lator to its original position by turning it clockwise.
DO NOT try to turn pressure regulator
knob past the built-in stop or damage
to pump will result.
Pressure
Regulator
Knob
Thermal
Relief
Valve