SERVICE (cont.)

CONTROL THERMOSTAT (cont.)

Test Procedures:

1.Disconnect the brewer from the power source.

2.Locate the blue wire on the control thermostat.

3.Check the voltage across the blue wire on the control thermostat and the white insert on two pole 120 volt terminal block or three pole 120/240 volt terminal blocks and the red insert on two wire 200 volt or 240 volt terminal block with a voltme- ter. Connect the brewer to the power source. The indication must be:

a)120 volts ac for two wire 120 volt models and three wire 120/240 volt models.

b)200 to 240 volts ac for two wire 200 or 240 volt models.

4.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness.

5.Locate the black wire on the control thermostat.

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

7.Check the voltage across the black wire of the control thermostat and the white insert on the two pole 120 volt or three pole 120/240 volt terminal block and the red insert on the two pole 200 volt or 240 volt terminal block with a voltmeter when the control thermostat is turned fully clockwise. Con- nect the brewer to the power source. The indica- tion must be:

a)120 volts ac for two wire 120 volt models and three wire 120/240 volt models.

b)200 to 240 volts ac for two wire 200 volt or 240 volt models.

8.Disconnect the brewer from the power source.

If voltage is present as described, reinstall the capillary 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 thermostat.

Removal and Replacement:

1.Disconnect the control thermostat wires.

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

3.Remove the one #8-32 screw securing the control thermostat to the component bracket inside the trunk.

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 the vertical position.

NOTE - The capillary tube must be clear of any electri- cal termination and not kinked.

7.Using one #8-32 screw, secure the control ther- mostat to the component bracket inside the trunk.

8.For first type thermostat, refer to the Fig. 3 when reconnecting thermostat wires. For second type thermostat, it does not matter which lead is con- nected to which terminal.

9.Adjust the control thermostat as required.

BLU to BLU wire from Limit

Thermostat

BLK to BLK Wire from Tank Heater (Brewers w/out Faucet) BLK to Thermal Cut-Off from Tank Heater (Brewers with Fau- cet)

First Type Thermostat

Second Type Thermostat

P1129

FIG. 3 CONTROL THERMOSTAT TERMINALS

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Bunn CRT5, CRTF5 service manual Service Control Thermostat, First Type Thermostat Second Type Thermostat
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CRT5, CRTF5 specifications

The Bunn CRTF5 and CRT5 coffee brewers are appreciated by coffee enthusiasts and professionals alike for their reliability, efficiency, and innovative features. These commercial brewing systems are designed to deliver high-quality coffee consistently, making them ideal for cafes, restaurants, and other food service operations.

One of the standout features of the Bunn CRTF5 is its ability to brew multiple batches of coffee simultaneously. With a capacity of brewing up to 3.8 gallons per hour, it is equipped to handle high demand without compromising on quality. The unit has a programmable digital control which allows users to easily adjust brew temperature and time, ensuring each batch is brewed to perfection. This level of control empowers operators to customize their brewing process according to the unique preferences of their customers.

In terms of design, the Bunn CRTF5 and CRT5 models incorporate a stainless-steel exterior that not only enhances durability but also adds a sleek look to any kitchen or coffee shop environment. The large, easy-to-read water level indicator allows for straightforward monitoring of the brewing process, minimizing the risk of running out of water during peak busy hours. The easy-to-use front-access design also simplifies the loading and unloading of coffee grounds and water.

Technologically, the Bunn CRTF5 and CRT5 incorporate advanced brewing technology that helps maintain optimal brew temperatures through the use of stainless-steel water tanks. These tanks ensure that water is heated quickly and is maintained at consistent temperatures throughout the brewing process, positively affecting flavor extraction and ensuring the rich taste of coffee.

Another crucial characteristic of these brewers is the brew basket, which is designed for efficient flow control. This feature assists in achieving an even extraction process, thereby enhancing the overall quality of the coffee produced. Furthermore, the sturdy construction of the basket ensures that it can withstand the demands of daily use in a high-traffic environment.

In conclusion, the Bunn CRTF5 and CRT5 coffee brewers stand out in the commercial coffee brewing market. Their combination of robust features, advanced technologies, and user-friendly design makes them a smart choice for those looking to serve high-quality coffee quickly and efficiently. Whether in a bustling café or a restaurant, these brewers are built to deliver exceptional coffee experiences every time.
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