DeWalt DH4240B Guide D'utilisation page 19

Glossary
Bypass mode: Allows water to re-circulate within pump when the gun trigger is not pulled.
chemical hose: Feeds cleaning agents into the pump to mix with the water. Refer to chemicals and cleaning solvents.
chemical injection system: Mixes cleaners or cleaning solvents with water to improve cleaning effectiveness.
choke control: Opens and closes carburetor choke valve.
cu: Cleaning Units. GPM multiplied by psi. (GPM x PSI = CU)
Fuel valve lever: Opens/closes connection between fuel tank and carburetor.
GPM: Gallons Per Minute. The unit of measure for the flow rate of water.
PsI: Pounds per Square Inch. The unit of measure for water pressure. Also used for air pressure, hydraulic pressure, etc.
kPa (kilopascal): Metric pressure measurement. 1 kilopascal equal 1000 pascals.
Quick-connect spray wand: Allows the user to quickly change out high­pressure nozzles. Refer to Spray Wand Nozzles.
thermal relief valve: 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.
Water supply: All pressure washers must have a source of water. The minimum requirements for a water supply are 20 psi (138 kPa) and
5 gallons per minute.
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