Bunn TWF service manual Tank Heater

Page 28

SERVICE (cont.)

TANK HEATER

P2198.50

FIG. 24 TANK HEATER

Location:

The tank heater is located inside the tank and se- cured to the tank lid.

Test Procedures:

1.Disconnect the brewer from the power supply.

2.With a voltmeter, check the voltage across the black and white wires on 120 volt models or the black and red wires for 120/208 volt models. Con- nect the brew to the power source. The indication must be:

a)120 volts ac for two wire 120 volt models .

b)208 volts ac for three wire 120/208 volt mod- els.

3.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4

If voltage is not present as described, refer to the Wir- ing Diagrams and check wiring harness.

4.Disconnect the black wire and the white wire or red wire from the tank heater terminals.

5.Check for continuity across the tank heater termi- nals.

If continuity is present as described, reconnect the wires, the tank heater is operating properly.

If continuity is not present as described, replace the tank heater.

NOTE- If the tank heater remains unable to heat, re- move and inspect heater for cracks in the sheath.

Removal and Replacement:

1.Disconnect the black wire and the white or red wire from the tank heater terminals.

2.Remove sprayhead and the hex nut securing the sprayhead tube to the hood. Set aside for reas- sembly.

3.Disconnect vent tube.

4.Disconnect and remove the faucet tube.

5.Remove the eight #8-32 nuts securing the tank lid to the tank.

6.Remove the tank lid with limit thermostat, spray- head tube, faucet tube, tank heater and vent tube.

7.Remove the two hex nuts securing the tank heater to the tank lid. Remove tank heater with gaskets and discard.

8.Install new tank heater with gaskets on the tank lid and secure with two hex nuts.

9.Install tank lid with limit thermostat, sprayhead tube, tank heater, faucet tube and vent tube using eight #8-32 nuts.

10.Secure sprayhead tube to hood using a hex nut.

11.Install sprayhead.

12.Connect vent tube to fitting.

13.Connect the faucet tube.

14.Reconnect the wires to the limit thermostat and tank heater. See limit thermostat section in this manual when reconnecting wires.

15.Refer to Fig. 25 when reconnecting the tank heater wires.

BLK to Control

WHI to Power Cord

Thermostat or

(120V Models) or

Thermal Fuse

RED to Terminal

 

Block (120/208V

 

Models)

FIG. 25 TANK HEATER TERMINALS

P1369

 

 

 

Page 28

10510

081599

 

 

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Contents Post Office BOX SPRINGFIELD, Illinois Telephone 217 529-6601 FAX 217Warranty ContentsIntroduction User Notices #00656.0000 #03408.0000 #00831.0000 #02822.0000 #03409.0000Plumbing Requirements Electrical RequirementsElectrical Hook-Up Initial SET-UP Adjusting Brew Volumes CleaningTEA/OFF/COFFEE Switch Start SwitchOperating Controls BrewingTroubleshooting Problem Probable Cause RemedyTroubleshooting Problem Probable Cause RemedyDilution Iced Tea cycle will not Start Switch Brew Timer Iced TeaBrew Solenoid Valve Iced Tea Dilution Solenoid ValveLevel in the dispenser. 750 GPM Pointing towards brewer Spitting or excessive steaming Lime Build-upSerious leaks Drip-out time too long Funnel TipProblem RemedyWater Temperature Weak beverageFilter Type Tea or Coffee Used for proper extractionComponent Access ServiceContents Brew Solenoid Valve HOT Coffee ServiceSolenoid valve Brew Solenoid Valve Iced TEA Brew Timer HOT COFFEE- Early Models Digital Brew Timer If voltage is as described, proceed to #7Service Digital Brew Timer HOT Coffee Late Modelscont Digital Timer WiringService Brew Timer Iced TEA Early Models Iced TEA Brew Timer TerminalsService Digital Brew Timer Iced TEA Late Models Service Digital Brew Timer Iced TEA Late Modelscont Test Procedures Disconnect the brewer from the power source Control ThermostatDilution Solenoid Valve Remove the blue wire from the limit thermostat Limit ThermostatTEA/OFF/COFFEE Switch TEA/OFF/COFFEE SwitchStart Switch Start SwitchTank Heater Tank HeaterService Thermal Fuse Models W/Faucet Only Thermal FuseService Half Batch Switch Optional GRY to Iced Tea Brew Timer PNK to Iced Tea10510 081599 Ready Indicator BLU

TWF specifications

The Bunn TWF series is a versatile and high-performance coffee brewing system designed to meet the demanding needs of commercial coffee establishments. Renowned for its reliability and consistency, the Bunn TWF is engineered for high volume production while maintaining exceptional quality in every cup.

One of the main features of the Bunn TWF is its dual-voltage capability, which makes it adaptable to various electrical systems, ensuring that businesses can use it in different locations with ease. It is compatible with both 120V and 220V outlets, providing flexibility for commercial environments.

The TWF employs Bunn's innovative brewing technology, which includes a patented digital pulse brew feature. This system optimizes the extraction process by controlling the flow rate and brewing time, enhancing the flavor profile of the coffee and ensuring that each batch is rich and full-bodied. The ThermoFresh technology allows for excellent thermal retention, ensuring that the coffee remains hot and fresh for extended periods without a heated plate that can alter the taste.

Another significant characteristic of the Bunn TWF is its brewing capacity. The machine can brew up to 16.3 gallons of coffee per hour, making it an ideal choice for busy cafes, restaurants, and catering services. The large capacity also translates to less downtime, enabling staff to serve customers more efficiently.

The Bunn TWF is equipped with a user-friendly control interface, featuring intuitive buttons and an easy-to-read display. This allows for precise programming and brewing options, accommodating various coffee types and recipes. Users can easily set up their preferred brewing parameters, making it convenient to replicate the same great taste repeatedly.

Moreover, the design of the Bunn TWF emphasizes durability and ease of maintenance. Constructed from high-quality materials, it can withstand the rigors of daily use in a bustling coffee shop environment. The machine is also designed for easy cleaning, with removable components that simplify upkeep and prolong its lifespan.

In conclusion, the Bunn TWF is an exceptional choice for those in the coffee business looking to elevate their brewing game. With its outstanding features, advanced technologies, and user-focused design, it stands out as a leader in commercial coffee brewing solutions. Whether for a high-traffic café or a catering operation, the Bunn TWF is engineered to deliver quality and efficiency while satisfying the most discerning coffee connoisseurs.
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