Bunn DV, H5X, H5E service manual Service Steam Sensor Thermistor, Thermistor Position

Page 17

SERVICE (cont.)

Steam Sensor (Thermistor)

Location:

The thermistor is located on the end of the overflow tube above the overflow cup.

To test the thermistor, access will also be needed to the electronic control board.

H 5X

P1993

FIG. 17a LOCATION

H 10X

P1993

FIG. 17b LOCATION

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Disconnect the thermistor from J5 on control board.

3.Check the resistance across thermistor with a ohmmeter. The resistance range is approximately 9K @ room temperature to approximately 2K @ 200°F.

4.Disconnect the dispenser from the power source.

If resistance was present as described, the thermistor is working.

If resistance was not present as described, replace the control board.

17

Removal and Replacement:

1.Disconnect the dispenser from the power source.

2.Disconnect the thermistor from J5 on control board.

3.Loosen the set screw and the two screws securing the two half blocks together. Remove thermistor assembly from overflow tube.

4.Install new thermistor on tube and slide down until it contacts the flared end. NOTE: It’s critical that the thermistor be centered directly under the tube opening.

5.Snug the set screw so the block assembly does not move aroung easily.

6.Connect the thermistor to J5 on control board.

NOTE: DO NOT TEST OPERATION WITH PANELS REMOVED, AS AIR MOVEMENT CAN HINDER PROPER READINGS ON THERMISTOR.

Mounting screws

Set screw

DO NOT BEND

THERMISTOR

UP/DOWN

FIG. 17c STEAM SENSOR EXPLODED

Thermistor centered

under tube opening

FIG. 17d THERMISTOR POSITION

42311 080510

Image 17
Contents Phone 217 529-6601 FAX 217 H10X/H5X H5E/DV PC H5 ElementBUNN-O-MATIC Commercial Product Warranty Contents Problem Fault CodesFlashes Description of Failure RemedyProblem Probable Cause Remedy Noises Water supply Ready indicator will not light Water boils continuously Temperature controlLime build-up Deposits. Delime as requiredComponent Access H10X Component Access H5E/DV-PC/XLiquid Level Control Flow Charts ServiceElectronic Controls LocationService Service Electronic ControlsLiquid Level Control Test Procedure H5X Thermostat Replace the electronic control board Location Limit thermostat is located on the tank lid Service Limit ThermostatSafety Overflow Wiring Service Safety Overflow SwitchIf voltage was present as described, proceed to #5 Service Solenoid Valve Late ModelsService Solenoid Valve Early Models Check for continuity across the tank heater termi- nals Service Tank HeaterLocation Tank heater is located in the tank lid Thermistor Position Service Steam Sensor ThermistorTest Procedures Service Dispense Valve PC OnlyRemoval and Replacement Location Dispense Valve is located behind control panel120V AC 2 Wire + GND 120/208V AC 3 Wire + GND Early H5E, H5X, H10X Install jumper thru ver120/240V AC 3 Wire + GND Single PhaseSchematic Wiring Diagram H5E-PC 230V AC 2 Wire + GNDH5-PC Schematic Wiring DiagramWire + GND Schematic Wiring Diagram H5E/H5X Relay Schematic Wiring Diagram H5XA, H5EA CESingle Phase Schematic Wiring Diagram H5 Element
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DV, H5E, H5X specifications

The Bunn H5E and H5X coffee machines represent a leap forward in brewing technology, specifically tailored for commercial use. Both models focus on delivering high-quality coffee while maximizing efficiency, making them ideal choices for busy cafés and restaurants.

The Bunn H5E features a unique 5-liter dual tank system, which allows for faster brewing times and reduces wait periods for customers. This dual tank setup facilitates the simultaneous preparation of multiple coffee types, catering to a diverse clientele. The H5X, on the other hand, is equipped with advanced electronic controls that permit precise temperature adjustments to ensure that the ideal brewing conditions are maintained, enhancing flavor extraction.

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