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  • Bunn Ultra-2 slushy machine problem

     fixbear updated 2 weeks, 4 days ago 4 Members · 5 Posts
  • Adam3351

    October 28, 2020 at 1:54 pm

    I have a couple Bunn Ultra-2 slushy machines. On both machines when both sides are on ice they do not freeze, just get a little icy. When 1 side is on and the other is off, it freezes perfectly. I had a company here do a couple of things to them but nothing they did worked. Theyre pricey and i don’t want to keep having them back for a shot in the dark fix. Any ideas?

  • fixbear

    October 28, 2020 at 5:06 pm

    What you are discribing is a lack of refrigeration capacity. What causes that?

    Does the unit have enough clearances from other objects and heat sources.? Is it clear more than 6 inches to the rear? Room below 90F

    Is the air filter clean? Remove and inspect with a light.

    Is the condenser coil clean and clear? Again, a light shining through is the best check.

    Is the condenser fan running at speed? Fan blade correct? Moving adequate air? This one is a common problem.

    Last, is it fully charged? Does it have the correct refrigerant? If it has had work on it, did they replace the filter/dryer? For this one you need a licensed refrigeration tech. Find one that knows what he is doing. Ask your local RSES chapter for referrals.

    Compressor amp readings directly correlate to load. Taken in with air temp measurements , one can tell it it has a cooling problem or capacity problem. How hot is the air from the condenser?

  • Andy Missimer

    October 29, 2020 at 3:15 pm

    yup, have had the same on the past. Ambient air too high. I’ve had ones like that blowing into each other, or re-circulating the air causing poor freeze.

  • jose joziuk

    November 8, 2020 at 1:12 am

    Sounds like a charge issue, low on Freon .

    • fixbear

      November 8, 2020 at 9:33 am

      jose, that is a possibility, but one that we use last on the check list for a reason. Today’s systems are fully sealed with no valves or taps for a reason. One can do a lot of non invasive checks before coming to a conclusion too the problem. That’s where your amp meter and temp instruments come in. By the way, your hand is a temp and air flow instrument. Your ears tell you fan speed as well as any other exposed skin you have.

      If you feel a condenser has a lot of heat at the top, it a vary low probability that it has a low charge and it will be drawing more amps than a starving compressor.

      These Bunn beverage machines have a lot of cooling stuffed into a small space. And we often find them against a backstop or placed back to back on a Island tight to each other. Not good. They are often placed in high traffic areas were there is a lot of dust from clothing, and environmental elements. Cardboard boxes shed a amazing amount of fiber. As do certain suspended ceiling tiles. One has to evaluate each location carefully when troubleshooting.

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