DeWalt DH4240B - Glossary of Terms; Technical Term Definitions

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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highpressure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.