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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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Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

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A

An assembly consisting of computer chips and an instructional label. Used for loading advertising messages into the brewer.

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Used either to pressurize the hot water tank or create turbulence in a brewing chamber during the brew process. Used in equipment such as SmartWAVE and trifecta.

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A shaft assembly containing torsion springs while engaged to a motor shaft will flex depending upon thickness of the product during auger rotation.

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B

The basin wrench is a multi-function tool that is used to rebuild various solenoid valves.

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The inability to initiate a brew if the water temperature is less than the ready temperature programmed into the brewer.
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A programming feature that compensates for flow-rate variations to maintain consistent dispense levels when water quality is a consideration.

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A programming feature that simplifies Pulse Brew and allows extraction manipulation with the touch of a button.

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A programming feature with Radio Frequency Identification (RFID) communications between grinder, funnel and brewer for custom warmer and recipe management without error. Works in conjunction with SMART Hopper, SMART Funnel, and a Recipe Writer/Card.

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A programming feature that provides quick access to the most utilized setup parameters including a lockout feature to prevent brewing when actual water temperature is below the Ready temperature. Features include: brew lockout, brew ounces, enable ads, enter service number and BrewMETER®.

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A proportioning device, which pumps two liquids (water and concentrate) in an exact ratio. The ratio is determined by the pump design, and is maintained precisely. The pump operates on the source pressure of one of the proportioned liquids; typically the incoming water eliminating the need for CO2 or electric power. Vacuum shut off is designed within the brix pump when the concentrate bag-in-box is totally empty to stop operation of brix pump.

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New BUNN Logo

An automated monitoring and communication system that detects pending service problems and forwards alerts for service.

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A function, like dilution, that reduces strength of a concentrate but it is intended for hot beverages. Generally, hot water is blended with coffee concentrate. Variable bypass allows different bypass rates for various brew volumes (small, medium and large) within a recipe.

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C

A component that acts similarly to a battery, it stores an electric charge then releases it when required. This device is found most generally on our grinder motors and compressors.

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A computer chip containing either recipes for specific coffee flavors or advertising messages which are read by the sensing coils on the brewer. One chip is embedded in each Smart Funnel® handle to carry the coffee flavor name and batch size ground from the grinder to the brewer.
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Clamp-On Ammeters are the recommended tool used for testing current and perhaps the most convenient. It is a non-invasive procedure, you simply clamp the meter onto one wire at a time. If you grab two wires they will cancel each other out and you will get an incorrect reading.

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Draws a vacuum or low pressure on the cooling side of the refrigerant cycle and compresses the gas into the high pressure or condensing side of the cycle. A compressor is one of the main components in the makeup of a refrigeration system.

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Condenser fan moves air across the condenser coil and fins to increase the transfer of heat. Obstructing the flow of air will reduce efficiency of cooling but can lead to compressor failure.

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A contactor is a heavy duty relay designed to handle switching large load components. This device is used in machines with multiple tank heaters or tank heaters that exceed 4000 watts. The contactor is energized by turning on the control thermostat, and supplies power to the tank heater(s).

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Technology used in BUNN super automatic espresso systems that perfectly foams cold milk for great tasting iced beverages.

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D

Digital Brewer Control, BUNN was among the first in the dispensed beverage industry to introduce advanced beverage technology to the industry with Digital Brewer Control systems that allow users to precisely and consistently meet specific flavor profiles while also reducing training and labor costs.

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The deliming spring is used to remove lime build up in the sprayhead tube on machines that do not have dispense valves. To use this tool, remove the sprayhead and insert the spring into the sprayhead tube and use a sawing motion, back and forth to losen and remove the lime build up.

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The deliming tool is used to remove lime build up in the sprayhead, bypass port, and sprayhead fitting. This tool is used differently depending on what you are cleaning.

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A function used to reduce strength of a concentrate for cold beverages. Generally cold tap water is blended with tea or coffee concentrate.

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The length of time from when the water spray over the grounds ends, to the time that no water drips from the funnel tip
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Dynamic pressure is the measurement of moving water in a closed condition, such as in a water line.

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E

An exclusive design used in decanters to assure convenient serving with a drip-proof, fast pouring lip from front or either side.

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This is a simplified version of Pulse Brew. It is programmed by selecting the time period of brew water dispense. Easy Pulse allows the operator to input a set time for which the brewer software will determine a pulse sequence.

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Water-soluble materials dissolve and move out of the coffee grounds and into the water. Part of the brewing process that includes Wetting and Hydrolysis.

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F

The factory preset brew settings that were installed into the brewer's memory.

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During a pulse brew, this is the time set for the initial flow of water over the grounds.

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Technology that continuously monitors extract-to-water ratio and assures flavor consistency.

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Sets the inability to initiate a brew cycle if the funnel is not properly inserted into the funnel rails.

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A sensor on the front hood of the brewer, which reads what name and batch size of coffee was ground into the funnel and allows for the brewer to automatically set itself to what is read from the funnel handle.

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H

A hammer arrestor is a plumbing device designed to absorb spikes in water pressure. It consists of a chamber filled with air that will compress when a surge of water is introduced into the water line. An indication of water hammer is clanging or noisy pipes and perhaps fluctuations in water pressure.

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The tank heater is a device used to heat the water in the tank. It is quite similar to the heating elements found in common household appliances, such as water heaters, ovens, and clothes dryers to name a few. Its construction is a high heat-resistive element encased in a heat-treated stainless steel tube. Magnesium oxide powder is used as filler and insulation to keep the resistive wire in place and away from the casing. Elements are built for specific applications and are not necessarily interchangeable. They are rated for applied voltage and a specific power output (wattage), which will determine the resistance (ohms value).

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Technology that mixes high viscosity concentrates thoroughly, consistently, and accurately to the required brix setting. The consistent results ensure the best quality beverage in the cup and contribute to maximum profits in the beverage program.

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A chemical reaction where the materials created during extraction break down further into water-soluble proteins and sugars. Part of the brewing process that includes wetting and extraction.

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I

A product line of coffee/rea brewers that allow different brewing profiles from the same machine/footprint, saving valuable counter space.

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Technology that allows the customer to see the milk frothing in the BUNN super automatic espresso systems with an integrated temperature sensor that simply cuts off steam through a wand when the milk reaches the preset temperature, eliminating the need to manually use a thermometer.

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L

During a pulse brew, this is the time set for the second on-time, and each alternating on-time for the remainder of the brew cycle.
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A limit thermostat is a safety device designed to open or break the circuit in high temperature or high current situations. They are rated for both current and temperature.

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The liquid level control board is an electronic device designed to automatically fill the brew tank with water when it senses a low level condition. It works in conjunction with the Liquid Level Probe and tank ground. A low AC signal is applied to the probe from this board. Minerals in the water complete the path from the probe to ground. When no ground is present and the machine is “on”, the liquid level board will then send a signal to the refill solenoid to energize. It will de-energize when the probe again senses water.

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The liquid level probe is a sensor that monitors the water level in the tank. When water comes in contact with the probe it completes the circuit to ground. Once the circuit is complete the control board knows the take is full and opens the refill circuit shutting off the incoming water supply.

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M

The term used to describe the screen that is displayed when the brewer is not in use. This screen is also displayed after exiting the programming mode.
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A control thermostat is a device designed to keep water at a constant temperature. It is preset for a specific temperature and will open and close its contacts to maintain that temperature.

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A microprocessor carries out a number of electronic functions in an integrated circuit. The microprocessors found in BUNN equipment are used to control water temperature, water delivery, motors, and other integrated components needed for machine operation.

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The multimeter is a handheld instrument designed to measure current, resistance, and capacitance. As one of the most valuable tools a technician uses on the job, it is important that it is used correctly. Before using a multimeter you should read the safety information and become familiar with the safety warnings and cautions. Taking the time to review the safety information is for your own safety as well as protecting the meter and all the equipment involved.

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N

The term for the recipe used by the brewer when there is no coffee name stored in the funnel. The brewer can contain separate No-Name recipes for the left and right brewing positions.
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O

During a pulse brew or preinfusion, this is the time set for the length of time that the water is not spraying over the grounds.
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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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R

Set of brewing parameters stored in the brewer. The parameters are unique for each coffee name and include brew ounces, pulse brew, percent bypass, pre-infusion and drip time.

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An assembly consisting of a computer chip and an instruction label. Used for loading a recipe into the brewer and the companion DBC Grinder.

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A rectifier is a solid state device designed to convert AC to DC. It can be as simple as a single diode to the more complex bridge or full wave rectifier, which is a combination of 4 diodes in a package.

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A Refractometer is used to read the amount of sugar content in products (Brixing). When light shines through a few drops of the product, it is refracted (bent) similar to a prism. The most critical part is to calibrate with distilled or R.O. water first.

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A water regulator is a device used to moderate water pressure. It will assist in keeping the pressure at a consistent level, especially important in siphon systems.

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A relay is a device that acts as an electrified switch. It consists of a set of contacts, an iron core plunger and a coil. The objective of the relay is to change the “state” of the contacts – they are known as being “normally open” or “normally closed”. When voltage is applied, the coil becomes an electromagnet, causing the iron core to draw up and physically trip the contacts from their normal state.

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Technology on auger motors in BUNN specialty drink systems that monitor the auger revolutions per minute (RPM) and controls powder dosing for each beverage, eliminating product waste and ensuring consistency cup-to-cup.

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A device used to measure the time between pulses for the purpose of monitoring RPM (revolution per minute).

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S

A brew-through lid with a vapor seal to maintain freshness and a spill prevention design.

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A system that includes a mother brewing system that remains in one location (e.g., kitchen) and dispenses into portable, or removable, servers for remote service.

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A funnel designed with a microchip that can receive information from an enabled grinder and transfer that information to an enabled brewer, managing the grinding and brewing process from start to finish. A SMART Funnel can be programmed to accept dedicated recipe information, reducing labor costs and minimizing brewing errors. Used in conjunction with BrewWISE technology.

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A hopper designed with a microchip that communicates the type of coffee contained in the hopper to an enabled grinder, managing the grinding and brewing process from start to finish. Used in conjunction with BrewWISE technology.

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Turbulence is an important element in brewing perfect coffee. SmartWAVE is a BUNN exclusive product design that uses technology to increase turbulence in the brew funnel, providing more contact between water and coffee and uniformity of extraction.

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A docking server system with technology that thermostatically controls and automatically shuts off heat in the docking system once the preset temperature is reached and additionally monitors server volume. This is more beneficial than traditional warmer plates that heat continuously.

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A solenoid is a device that acts as an electrified faucet. It consists of a valve body, seat cup/plunger assembly and an electromagnetic coil. When voltage is applied, the coil will draw the iron core plunger away from the valve body and allow water to flow past the seat cup (diaphragm).

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Hayes Solenoid Spanner Wrench
The Hayes spanner wrench is used only when rebuilding Hayes style solenoid valves. This tool is used in conjunction with a crescent or open-ended wrench.

Skinner Solenoid Spanner Wrench
The Skinner spanner wrench is used only when rebuilding Skinner style solenoid valves. This tool is used in conjunction with a crescent or open-ended wrench.

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An exclusive design with a shield next to the funnel handle that deflects hot liquids away from the user’s hand.

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Static pressure is the measurement of water that is not moving or flowing.

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Switches are devices designed to allow current/voltage to pass or not to pass, depending on whether it is "open" or "closed". There are many different configurations available to satisfy many different applications. They are as simple as a single pole, single throw (wall switch), to the much more sophisticated "gauge" type switches that have multiple layers and can switch many components off or on at the same time. They come in many different packages as well. Membrane switches are common in touch pads, float switches are reed switches that are activated by magnets, and mechanical switches are sets of contacts.

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T

Thermal cut off, or sometimes referred to as TCO, is a fuse that acts in the same way as a limit thermostat. If the temperature reaches a certain level the TCO fuse will blow just the same as any other fuse, cutting power to the tank heater. The TCO is also current sensitive.

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A thermistor is a temperature sensitive resistor used to monitor temperatures. It changes value as it cools or heats. NTC (Negative Temperature Coefficient) thermistors will decrease in ohms value as it heats, and are commonly used in temperature sensing. PTC (Positive Temperature Coefficient) thermistors increase in ohms value and are generally used in protective circuits by monitoring over current conditions.

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A thermoelectric cooler (TEC) is a small cooling device that relies on a Peltier junction. Composed of two conductors made of different materials, a Peltier junction acts as a heat pump which can cool or warm when current is passed through it. For example as current passes through one side is hot and the other is cold. This device is used to chill, (approximately 20º from ambient air temperature), but not refrigerate concentrate product.

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BUNN offers a full line of vacuum-insulated servers and brewers that brew directly into these servers that keep coffee at optimal flavor for hours and save on energy consumption and by not requiring warming plates.

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The timer board is designed to provide the voltage to a specific device in order to energize it. It can energize a relay, inlet solenoid, pump, dump valve or other device for brewing or can energize a motor to grind coffee, to name a few.

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The board consists of an inferred LED and a photo transistor which monitor the auger shaft and motor pin distance. The microprocessor will determine the shut off point of the refrigerant solenoid in relation to the thickness (distance) setting in the function menu.

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Total dissolved solids, or TDS, is the total weight of the solids that are dissolved in the water, given in ppm per unit volume of water.

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A transformer is a device used to step a voltage up or down and isolate circuits. It consists of two sets of windings (lengths of coated wires), which have no electrical connection to each other. An AC voltage is applied to the primary winding, which generates a field of flux. This action causes the secondary of the transformer to generate a stepped-down AC voltage. In BUNN equipment, 12 volt and 24 volt step down transformers are most common.

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A triac is a solid-state device that performs the same function as a relay, without the moving parts. Its construction is T-1 (terminal), T-2, and a gate. Normal state of a triac is “open” between T-1 and T-2. Applying a small AC voltage to the gate activates it, which then “shorts” or closes the two terminals and allows current to pass. Because there are no moving parts, a triac has no contacts and will not “pit” and wear out like a relay can.

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U

This motor is used to rotate the auger; mixing the product and shaving the ice off the cooling drum. The motor has a fixed RPM speed.

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The Universal Power Supply, (UPS), is used to convert variations of line voltage to 24 VDC. The power supply powers all internal components except for the tank heater, which operates on line voltage.

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V

The venturi assembly creates a siphon that pulls product through the valve, where water and concentrate are mixed during a dispense. The water under pressure flows through a narrow or restricted area, which increases the speed or velocity of the water in the valve. The increased speed of the water creates a low pressure at that point creating a suction or vacuum pulling the concentrate into the assembly where it is mixed with the water.

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W

Grounds begin to absorb hot water from the sprayhead and release gasses from the coffee. Part of the brewing process that includes Extraction and Hydrolysis.

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A high speed motor used to rotate a frother blade to blend product (powder) and water during a beverage dispense.

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