BUNN Ultra NX Frozen Beverage Dispenser Instructions

Maintenance &
Troubleshooting Guide
Ultra® NX
Frozen Beverage Dispenser

Ultra NX Frozen Beverage Dispenser

power switch to the ON position.
Left (or Right) side auger not turning| Press left (or right) uager toggle switch to start. (Power must be ON).
Left (or Right) side not freezing| 1) Left (Right) side auger must be turning.
2) Press left (or right) ice control switch until the display reads “ICE”.
3) Adjust product thickness (See “How-to” box below or the manual).
Product is very slow to freeze| 1) Check that rear of machine has a 4-inch minimum air clearance.
2) Clean rear screen with soapy water or compressed air.
3) Deflect away any warm air from nearby equipment.
Lamps in top covers are out| Check that tops are plugged into base of unit.

If the suggested remedy does not solve the problem, call for help or service.

5 seconds. When “Cleaning Guide” is displayed, press the Right Dot switch to select YES. Then select the Center Dot switch to step through the 9 instructional screen displays.
Adjust Product Thickness
(This feature may be password protected)| Press and hold the Center Dot switch for 5 seconds. When “Cleaning Guide” is displayed, press the Left Dot
switch to select NO. The screen will then display “Set Thickness?” Select YES (the Right Dot switch) to display thickness scale for the LEFT hopper. Move the scale up or down using the Left Dot and Right Dot  switches (minimum is 1; maximum is 16). Then press the Center Dot switch to display thickness setting for  the RIGHT hopper. Adjust as necessary. Display will time-out and return to home screen after 60 seconds.
Display Temperature & Torque readings| This provides valuable information to a technician and helps to determine whether a problem is in the refrigeration system or mechanical in nature. Simultaneously press and hold the Left Dot and Right Dot  switches for 5 seconds. The top number displayed is the auger torque reading for each cooling drum.
The bottom number toggles between the cooling drum temperature and the hot gas temperature. Record all  three numbers for each drum before calling for service. Simultaneously press and release the Left Dot and  Right Dot switches to return to the home screen.
• Activate/change night time thaw mode
• Activate/change cleaning schedule
• Change Date and Time| See “Programming the Dispenser” in the equipment Operating and Service Manual.
These features may be password protected.
Clean REAR Filter Screen| Pull Left and Right tab out to remove screen.
Clean with soapy water or compressed air and re-install the screen.

day, usually overnight. The ice granules get too large and a consistent product is difficult to maintain if left frozen too long. The machine will automatically  return to normal freeze mode at the programmed time. To change this setting, check the Operating & Service Manual.
CLEAN DUE TODAY| Follow cleaning procedure on the Cleaning Card or access the one on the display window.
(See Access Cleaning Guide on LCD Screen in “How to” section above)
CLEAN DUE NOW| See above. You must clean for the LCD display to clear.
MONTHLY FILTER CLEAN REQUIRED| Clean rear screen with soapy water or compressed air. Press Left Dot button and hold for 3 seconds to clear  screen.
FILTER NEEDS CLEANING| Compressor is overheating and will shut down. Clean rear screen and be sure rear of machine has a minimum 4-inch air clearance.
!! FILTER NEEDS CLEANING !!| Compressor is running too hot. Service is required.
SHAFT SEAL MAINTENANCE DUE| A reminder that a 12-month Preventive Maintenance is recommended. See Operating manual for further  nstructions.
LEFT/RIGHT TEMPERATURE SENSOR
SHORTED/OPEN
• Left/Right Torque Sensor Shorted/Open
• Hot Gas Thermistor Shorted/Open| Add product to minimum fill line. If warning continues, follow instructions below.
LEFT/RIGHT REFILL ERROR
(Hopper Lights Flashing)| Record Temperature & Torque numbers (see “How to” section above).
Call for service and provide these numbers to the technician.
CHECK RIGHT/LEFT SIDE PRODUCT MIX
OR DRIVE SYSTEM| Press Left Dot button for 3 seconds to clear.
DEFROST – LEFT/RIGHT BARREL(S) IN
PROCESS OF DEFROSTING| Product thickness not correct. Check product ratio/brix. And/or refill hopper if low.
This will go back to normal operation after defrost is complete.
HOPPER LIGHTS FLASHING| Hopper is low on product. Refill hopper to clear error.
If unit has Autofill; product BIB may be empty. Replace if needed.

NOTICE: This guide is for quick reference only and is not intended to replace the information in the Operation Manual.

DISASSEMBLY & CLEANING

1. Turn cooling to OFF selection.
Empty all product from the Hoppers. Turn Auger  to OFF selection.| 2. Disconnect the Hopper Lid Cords on the back of the Hoppers.| 3. Disconnect the Level Probes at the top rear of the Hoppers.

4. Remove Hopper Lids.| NOTE: If it’s an Autofill unit;
disconnect the Fill Hoses from the back of the Hoppers also.

5. Remove the Faucet Assembly.
CAUTION: The Faucet Valve is under Spring tension. Use tab on left side of the Handle to pull off Pivot Pin.| 6. Removing Handles
a. While slightly twisting the Handle, pull the left  side off the left Pivot Pin.
b. Then spread Handle on right side to remove from right Pivot Pin.| 7. Carefully slide the Faucet Valve up to remove the Spring and Faucet Seal.
NOTE: Extra care should be taken when  handling the seal to prevent damage.
Do not fold the seal as this will cause damage to  the Teflon® sealing surface.

8. Depress the Hopper Lock Plunger and lift the Hopper up slightly.| 9. Pull Hopper forward to remove.

10. Remove Auger Nose Bushing from inside the Hopper.| NOTE: Care must be taken to ensure this surface does not get scratched during cleaning.
Deep scratches could cause leakage around the Seal.| 11. Remove the Seal from the back of the Hopper.

12. Pull Auger from Cooling Drum.| 13. Pull Grommet from Cooling Drum.

14. Wash all parts in a clean sink with mild soap and hot water (120°F). Place all parts in a clean sink with Sanitizer Solution in 120˚F (48.9˚C) water. Allow all parts to soak  for at least 5 minutes. Carefully wash all components with a clean wash cloth in the hot water and Sanitizer Solution. Use a clean, soft, bristle brush as needed for the smaller  components and tight areas. NOTE: Do not immerse Hopper Lids and use a commercial sanitizer.
15. Wash the Cooling Drums, Hoppers, Drip Trays, Top Covers, and outer enclosure using a clean wash cloth that has been soaked in the warm water and Sanitizer Solution.  NOTE: Pay attention to the shaft area and make sure it is thoroughly cleaned and sanitized.
16. Thoroughly rinse all surfaces with a clean wash cloth that has been dampened with hot water. Wipe dry with a clean, dry wash cloth before reassembling the dispenser.  NOTE: Although most parts are dishwasher safe, they may be affected by the chemicals in some commercial sanitizing agents. Do not place the Hopper or Hopper Lids in a dishwasher. Rinse thoroughly before assembly.

ASSEMBLY AFTER CLEANING

1. Apply provided lubricant to Grommets on  side facing Cooling Drum.
2. Install Grommets on the ends of the Cooling Drums.| 3. Align the Auger Shaft with the Flat Fin of the  Auger.
4. Push Augers onto Cooling Drum and rotate  until the Flat Fins are flush inside Auger.| 5. Install Auger Nose Bushing into interior slots.
6. Install a Hopper Seal over the back of each hopper.

7. Install Hoppers over the Augers and Cooling Drums.
8. Slide the Hoppers into place and push down.| 9. The Hoppers are seated when the Lock Plunger snaps into place and sticks out.

10. Place Spring and Seal in Faucet Valve.
11. Carefully slide Faucet Valve Assembly into  place on the Hopper.| 12. Install a Handle by starting the right side  over the right Pivot Pin.
13. While slightly twisting the Handle, spread  the left side over the left Pivot Pin to snap into place.| 14. Install Level Probes at the top rear of the Hoppers.
15. Set Lids on the Hoppers.

NOTE: If this is an Autofill unit, slide the Hopper Fitting into place in the slot on the Hopper.
16. Attach each of the Hopper Lid Cords on the back of the Hoppers.| 18. Turn ON augers and cooling function to desired settings.
17. Assemble Drip Tray and slide onto metal extensions from base.

NOTE: Whether liquid concentrate or granulated powder, all product must be thoroughly mixed BEFORE adding it to the hoppers.

58028.0000 B 2/22 © 2021 Bunn-O-Matic Corporation
www.bunn.com

References

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