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In this glossary you will find various definitions and explanations for components, tools and technical terms related to BUNN commercial equipment.



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P

A peristaltic pump is a type of positive displacement pump used for pumping a variety of fluids. The fluid is contained within a flexible tube fitted inside a circular pump casing. A rotor with a number of ‘rollers’ attached to the external circumference compresses the flexible tube. As the rotor turns, the part of tube under compression closes forcing the fluid through the tube. Peristaltic pumps are typically used to pump fluids to prevent contamination from the pump or other outside contaminates.

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This motor is used to rotate the hopper gear to deliver powder to the mixing chamber in powder drink machines. The motor is used to control the flow of product to the mixing chamber by increasing or decreasing DC voltage in 2.5% increments.

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The process of beginning a brewing cycle with an initial spray of water onto the grounds followed by a pause in the spray. After the programmed pause, the spray continues without interruption until the end of the brewing cycle.
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The process which allows the brew water to start, then stop, repeatedly, over the grounds in order to derive the best flavor from the coffee. Pulse brew is also used in some instances to prevent a funnel overflow. 
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