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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 pressure, etc. GPM: Gallons Per Minute. The unit of measure for the flow rate of water through the pressure washer. 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. Chemical Injection: Feeds cleaning agents into the pump to mix with the pressurized water and help in cleaning. 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. Any supply pressure or delivery rate less than this will not allow the pressure washer to operate at its full potential and may cause damage to the pump. PRESSURE WASHER OPERATING FEATURES Bypass Mode During normal operation the water supply is turned on, engine is running, spray gun trigger is depressed, and the cold water supply circulates inside the pressure washer pump allowing pump to maintain a safe operating temperature. When you release spray gun trigger and engine is still running, you are in bypass mode. When unit is in bypass mode, water circulating inside the pump begins to heat up. If unit is left in bypass mode for more than two (2) minutes, the water temperature will rise to a dangerous level and damage internal components of the pump. If pressure washer is operated without an adequate water supply or operated for more than two (2) minutes without depressing the spray gun trigger, the pump will overheat and be seriously damaged. Any damage to pump due to these causes will not be covered under warranty. 9 — ENG D22885 Thermal Relief Valve In an effort to prevent 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. DO NOT allow your unit to operate in bypass mode for more than two minutes at any time. Overheating of pump will cause damage to pump. Pressure Adjustment 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. Reduce the speed of the gasoline engine (RPM). Slow the engine down and the water pressure will go down with it. Step 3 is for models PCH2627, PCH3030 and PCH3540HR. 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 regulator to its original...

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