SERVICE (cont.)

8. Disconnect the brewer from the power source.

CONTROL THERMOSTAT

P2198.50

FIG. 14 CONTROL THERMOSTAT

Location:

The control thermostat is located inside hood on the right side to the left of the iced tea brew timer.

Test Procedures:

1.Disconnect the brewer from the power source.

2.With a voltmeter, check the voltage across the blue wire on the control thermostat and the white wire on the tank heater for 120 volt two wire models or red wire on the tank heater for 120/208 volt three wire models. Connect the brewer to the power source. The indication must be 120 volts ac for two wire 120 volt models and 208 volts ac for three wire 120/208 volt models.

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 the brewer wiring harness.

4.Locate the black wire on the control thermostat.

5.Gently remove the capillary bulb and grommet from the tank.

6.With a voltmeter, check the voltage across the black wire of the control thermostat and the white wire on the tank heater for 120 volt two wire mod- els or red wire on the tank heater for 120/208 volt three wire models when the control thermostat is turned fully clockwise. Connect the brewer to the power source. The indication must be 120 volts ac for two wire 120 volt models and 208 volts ac for three wire 120/208 volt models.

If voltage is present as described, reinstall the capil- lary tube into the tank to the line 4.5" above the bulb, the control thermostat is operating properly.

If voltage is not present as described, replace the ther- mostat.

Removal and Replacement:

1.Remove both wires from the control thermostat terminals.

2.Remove the thermostat capillary bulb by firmly pulling up on the capillary tube at the tank lid. This will disengage the grommet from the tank lid.

3.Remove the #8-32 screw holding the control ther- mostat to its bracket.

4.Slide the grommet to the line 4.5" above the bulb on the new capillary tube.

5.Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid.

6.Carefully bend the capillary tube so that the tube and bulb inside the tank are in a vertical position.

NOTE – The capillary tube must be clear of any elec- trical termination and not kinked.

7.Fasten the new control thermostat to its bracket.

8.Refer to Fig. 15 when reconnecting the wires.

9.Adjust the control thermostat as required.

I

FF

H

UNNB

O

 

BLK to Tank Heater or

Thermal Fuse on Models

W/Faucet

BLU to Limit Thermostat

P1390

FIG. 15 CONTROL THERMOSTAT TERMINALS

Page 23

10510

081599

 

 

Page 22 Page 24
Page 23
Image 23
Bunn TWF service manual Control Thermostat, Test Procedures Disconnect the brewer from the power source
Page 22 Page 24

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.
Top Page Image Contents