Bunn TNTF-3 Control Thermostat, Test Procedures Disconnect the brewer from the power source

Page 23

SERVICE (cont.)

CONTROL THERMOSTAT

P2213.60

FIG. 14 CONTROL THERMOSTAT

Location:

The control thermostat is located inside hood on the right side just behind 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:

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 Wiring Diagram 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:

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

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

8.Disconnect the brewer from the power source.

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

 

H

OFF

HI

OFF

NNUB

BUNN

BLK to Tank Heater or

Thermal Fuse on Models

W/Faucet

BLU to Limit Thermostat

P1390

FIG. 15 CONTROL THERMOSTAT TERMINALS

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28201 081598

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Contents Telephone 217 529-6601 FAX 217 Post Office BOX SPRINGFIELD, IllinoisIntroduction ContentsWarranty #00831.0000 #00656.0000 #03408.0000 #03409.0000 User NoticesElectrical Hook-Up Electrical RequirementsPlumbing Requirements Initial SET-UP Plumbing RequirementsInitial SET-UP Adjusting Brew VolumesOperating Controls CleaningICED/OFF/HOT Switch Start SwitchRemedy TroubleshootingProblem Probable Cause Remedy TroubleshootingProblem Brew cycles will not start Brew TimerProblem Probable Cause Remedy Probable Cause Remedy Beverage overflows dispenser Dispenser Water flows into tank continuously Brew TimerOr HOT position PositionFunnel Brewer is making unusal noises Solenoids Remove and clean lime off the tank heater. SeeWeak beverage Filter Type Tea Sprayhead Funnel Loading Dry tea leaves remainContents ServiceComponent Access Solenoid valve ServiceBrew Solenoid Valve HOT TEA Brew Solenoid Valve Iced TEA HOT TEA Brew Timer Brew Timer HOT TEA Early ModelsIf voltage is as described, proceed to #7 Brew Timer HOT TEA Late ModelsDigital Timer Wiring Service Brew Timer HOT TEA Late MODELScontBrew Timer Iced TEA Early Models Iced TEA Brew Timer Brew Timer Iced TEA Late MODELScont Control Thermostat Test Procedures Disconnect the brewer from the power sourceDilution Solenoid Valve Test Procedure Disconnect the brewer from the power sourceLimit Thermostat Limit ThermostatICED/OFF/HOT Switch ICED/OFF/HOT SwitchStart Switch Start SwitchEls Tank HeaterIndication must be Thermal Fuse Service Thermal Fuse Models W/Faucet Only28201
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TNTF-3 specifications

The Bunn TNTF-3 is a high-performance coffee brewer designed for commercial use, specifically suited for busy environments such as restaurants and cafes. This machine seamlessly combines efficiency with quality, making it a popular choice for professionals who demand the best in their equipment.

One of the standout features of the Bunn TNTF-3 is its three warmer plates, which allow users to brew and store multiple batches of coffee simultaneously. This design ensures that there’s always fresh coffee ready for customers, minimizing downtime during peak service hours. Each warmer has its own independent control, providing versatility in temperature settings to accommodate different coffee types and customer preferences.

The Bunn TNTF-3 utilizes a patented SplashGard funnel that helps to keep the brewing process clean and efficient. This technology not only prevents splashes and messes but also improves user safety by protecting operators from hot water and coffee spills. The brewer’s stainless steel construction contributes to its durability, enhancing its longevity in a high-volume setting.

In terms of brewing capabilities, the TNTF-3 can prepare up to 3.8 gallons of coffee per hour, making it ideal for both small and large operations. The machine is equipped with a brew control feature that allows users to customize the strength and flavor of the coffee, ensuring that each cup meets the highest standards. Additionally, the digital timer and brew status light offer convenient monitoring at a glance.

For ease of maintenance, the Bunn TNTF-3 is designed with accessibility in mind. With removable components and straightforward cleaning procedures, operators can keep the machine in top condition without significant downtime. The brewer also features a low-water shut-off system, which helps to protect the unit from damage due to insufficient water levels.

Overall, the Bunn TNTF-3 embodies a blend of innovative technology, practical design, and optimal performance, making it a powerful tool for coffee professionals. Whether it be for daily service or special events, the Bunn TNTF-3 stands out as a reliable coffee brewing solution that consistently delivers rich, flavorful coffee with every batch. Its combination of speed, safety, and quality assurance solidifies its status as a preferred choice in commercial settings.
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