Bunn dispenser service manual Pressure Regulator and Needle Valve, Adjustments

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SERVICE (cont.)

PRESSURE REGULATOR and NEEDLE VALVE

P1935

FIG. 30 PRESSURE REGULATOR

and NEEDLE VALVE

Location:

The pressure regulator and needle valve are located inside the rear panel at the bottom of the dispenser.

Adjustments:

The water pressure regulator is preset at the factory to produce 15 psi (103 kPa) of water pressure at the regulator outlet with inlet pressures ranging from 20 psi to 90 psi (138 to 620 kPa). No field adjustments of the pressure regulator should ever be necessary.

The needle valve is preset at the factory to dispense 1 fluid ounce of water per second. The dispenser is designed to accommodate various product mix ratios by adjusting the product dispense rate (see Initial Setup). Should a readjustment of the water dispense rate become necessary, proceed as follows:

1.Disconnect the dispenser from the power source.

2.Remove the six #8-32 screws securing the rear panel to the dispenser housing.

3.Turn the needle valve adjustment screw counter- clockwise to increase the water flow rate, and clockwise to decrease the water flow rate.

Removal and Replacement:

Pressure Regulator

1.Disconnect the dispenser from the power source and the water supply.

2.Remove the six #8-32 screws securing the rear panel to the dispenser housing.

3.Disconnect the .25" copper tube from the outlet of the pressure regulator.

4.Loosen the nut securing the bulkhead fitting to the dispenser.

5.Remove the bulkhead fitting from the inlet to the pressure regulator.

6.Remove the pressure regulator assembly.

7.Attach the regulator to the bulkhead fitting making sure that the copper bushing is seated properly in the regulator and tighten securely.

8.Tighten the nut securing the bulkhead fitting to the dispenser housing.

9.Attach the .25" copper tube to the regulator assem- bly and tighten securely.

10.Connect the dispenser to the water source and check for leaks. Tighten any leaking connections before installing rear panel.

Removal and Replacement:

Needle Valve

1.Disconnect the dispenser from the power source and the water supply.

2.Remove the six #8-32 screws securing the rear panel to the dispenser housing.

3.Disconnect the .25" copper tube from the inlet fitting on the needle valve.

4.Disconnect the water outlet from the solenoid valve.

5.Remove the solenoid valve and needle valve as described in section- Dispense Solenoid Valve.

6.Remove the needle valve assembly. Remove the fitting from the inlet port of the needle valve.

7.Install the fitting removed from the old needle valve onto the new needle valve using pipe thread sealant (BOM #M2526.0000).

8.Attach the needle valve to the fitting on the dispense solenoid valve using pipe thread sealant (BOM #M2526.0000) and tighten securely.

9.Install the solenoid valve and needle valve as de- scribed in section- Dispense Solenoid Valve.

10.Attach water inlet and outlet lines and tighten se- curely.

11.Connect the dispenser to the water source and check for leaks. Tighten any leaking connections before installing rear panel.

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Contents Post Office BOX SPRINGFIELD, Illinois Bunn Powder Auto FillIntroduction BUNN-O-MATIC Commercial Product WarrantyUser Notices Initial SET-UP34561.0000 Operating Instructions Adjustments Recommended Daily Cleaning and Maintenance Tips CleaningRinse and dry each item thoroughly before reas- sembling Door not closed Fault ListNormal operation Powder Auto-Fill ready to DispenseProblem Probable Cause TroubleshootingRemedy ProblemPowder Auto-Fill hopper not in- stalled properly Water Strainer Optional Control Board and ProbeAuger Drive TransformerProblem Probable Cause Remedy Component Access ServiceSpacer Dust Seal Hopper Base Auger Drive ComponentsHopper Lid Retainer ClipAuger Drive Motor Diagrams and check wiring harnessMixing Chamber Frother and MIXING/WHIPPER ChamberVolts ac for 120 volt models Volts ac for 230 volt CE models Whipper MotorWhipper Motor Install dispense tip into the bottom of the whipper chamberIf voltage is present as described, proceed to #9 If voltage is present as described, proceed to #5Test Procedure Low Product Detect Remove the control board Instal the new control board using the four #6-32 keps nutsDisconnect the wires from the switch terminals TEST/SERVICE SwitchLocation Main Power ON/OFF Switch Main Power ON/OFF SwitchRefer to when reconnecting the wires Lamp Cord AssemblyDisconnect the lamp cord from the lamp cord connector Lamp Cord ConnectorRemove new nut and washer from new lamp cord connector Close the dispenser door Lamp HOLDER/SOCKET AssemblyTransformer TransformerPotentiometer PotentiometerHopper Level Indicator Hopper Level IndicatorHopper Switch Hopper SwitchDoor Switch Door SwitchPressure Regulator and Needle Valve AdjustmentsDispense Solenoid Valve Location Dispense Solenoid ValveSchematic Wiring Diagram PAF Wiring DiagramsSchematic Wiring Diagram Pafa

dispenser specifications

The Bunn dispenser is a highly regarded name in the beverage service industry, known for its reliable coffee brewers, steeping equipment, and beverage dispensing solutions. These dispensers are designed with efficiency and quality in mind, making them a favorite in restaurants, cafes, and other foodservice establishments.

One of the main features of the Bunn dispenser is its rapid brewing capability. Utilizing a unique brewing system, Bunn dispensers can quickly brew large quantities of coffee, which is essential for high-demand environments. The machines are equipped with advanced heating technology that ensures water is brewed at the optimal temperature for extracting the best flavors from coffee grounds. This feature not only enhances the quality of the beverage but also significantly reduces waiting times for customers.

Another key characteristic of Bunn dispensers is their durability. Built with high-quality materials, these machines are designed to withstand the rigors of a busy kitchen environment. The robust construction ensures a long lifespan, minimizing the need for frequent repairs or replacements. Additionally, many models feature stainless steel components that are resistant to corrosion and easy to clean, maintaining hygiene standards while also looking professional.

Bunn dispensers are also known for their versatility. With a range of models available, including single and multi-hopper options, they can dispense various beverages, including coffee, tea, and iced drinks. This flexibility allows businesses to cater to different customer preferences without requiring multiple machines. Moreover, Bunn dispensers often come with programmable features, enabling users to customize brew strengths and volumes for optimal beverage consistency.

In terms of technology, Bunn has incorporated advanced digital controls and user interfaces in many of its models. These digital displays simplify operation, allowing staff to monitor brewing processes and receive alerts for maintenance requirements efficiently. Such technological integration enhances user experience and operational efficiency.

Energy efficiency is another consideration in the design of Bunn dispensers. Many models are equipped with energy-saving features, which help reduce power consumption during both operation and standby modes. This focus on sustainability not only lowers utility costs for businesses but also aligns with the growing consumer demand for environmentally responsible practices.

In conclusion, Bunn dispensers combine speed, durability, versatility, advanced technology, and energy efficiency, making them an excellent choice for any foodservice operation. Their ability to deliver high-quality beverages quickly and consistently makes them a pivotal asset for businesses aiming to provide an exceptional customer experience.