Stoelting U431 Owner's Manual
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Stoelting U431 Owner's Manual

Cab model soft-serve pressurized freezer
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See also: Operator's Manual
Model U431
(Serial #17978 and up)
OWNER'S MANUAL
Manual No. 513568-4 May 2004, Rev. 0

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Summary of Contents for Stoelting U431

  • Page 1 Model U431 (Serial #17978 and up) OWNER'S MANUAL Manual No. 513568-4 May 2004, Rev. 0...
  • Page 3 Need Parts or Service? We stock the parts you need. Our Technicians are factory trained and are certified in the Stoelting Technicare program. CALL Distributor: _________________________ Phone No.: _________________________ Model No.: _______________________ Serial No.: _______________________ Purchase Date: ____________________ Start-Up Date:____________________...
  • Page 5 If problems develop or questions arise in connection with installation, operation or servicing of the freezer, contact the company at the location listed below. STOELTING, LLC 502 Hwy 67 Kiel, WI 53042-1600 STOELTING OWNER'S MANUAL ® MODEL U431 Tele: 920-894-2293 Fax: 920-894-7029...

  • Page 7: Table Of Contents

    TABLE OF CONTENTS Section 1 ... 1 Description ... 1 Specifications ... 2 Section 2 ... 3 Safety Precautions ... 3 Shipment & Transit ... 4 Freezer Installation ... 4 Installing Permanent Wiring ... 4 Mix Pump ... 5 Section 3 ... 9 Safety Precautions ...
  • Page 8 ILLUSTRATIONS Figure 1 Model U431 Freezer ... 1 Figure 2 Specifications ... 1 Figure 3 Decal Locations ... 3 Figure 4 Water/Electrical Connections ... 4 Figure 5 Auger Rotation ... 4 Figure 6 Mix Hose Installation... 5 Figure 7 Mix Pump ... 6 Figure 8 3-way Tee ...

  • Page 9: Section 1

    SECTION 1 INTRODUCTION 1.1 DESCRIPTION The Stoelting U431 floor model freezer is pressure fed. The freezer is equipped with fully automatic controls to provide a uniform product. The freezer is designed to operate with almost any type of commercial soft-serve or non-dairy mixes available, including ice milk, ice cream, yogurt, and frozen dietary desserts.

  • Page 10: Specifications

    1.2 SPECIFICATIONS l a t i n i t i u t i u : h t " 4 : h t y t i . T . " 3 " 2 " 4 : t h " 4 " 0 t t i f...

  • Page 11: Section 2

    If you are in need of replacement labels, indicate the part number, type of label, location of label, and quantity re- quired along with your name and address and mail to: Figure 3. Decal Locations Stoelting, LLC Commercial Products 502 Hwy. 67 Kiel, WI 53042...

  • Page 12: Shipment & Transit

    If concealed damage and/or shortage is found later advise the carrier within ten days and request in- spection. The customer must place claim for damage and/or shortages in shipment with the carrier. Stoelting, Inc. cannot make any claims against the carrier. 2.3 FREEZER INSTALLATION...

  • Page 13: Mix Pump

    2.5 MIX PUMP Mix Pump Hose Installation Follow the steps below to install the mix pump hose. 1. Turn pump on. 2. Feed one end of mix pump hose into the entering or pick-up hose side (left) of black cover. 3.

  • Page 14: Figure 7 Mix Pump

    Connect 1/2 inch (12,7mm) I.D. plastic food grade tubing to mix check valve (Item 7) and then to the mix container. Observe check valve flow arrow. Secure with hose clamps. Then place assembly thru hole in cover and install retainer clip. See Figure 9.

  • Page 15: Figure 8 3-Way Tee

    Refrigerated Mix Transfer Line 3-way Tee Large Port (Air/Mix) Figure 8. 3-way Tee Low Mix Cord Cover Retainer Container Clip Figure 9. Mix Inlet Tube & Probe Assy. Clip Hose Holder Figure 10. Hose Holder...

  • Page 17: Section 3

    3.1 SAFETY PRECAUTIONS SAFE OPERATION IS NO ACCIDENT; observe these rules: Know the freezer. Read and understand the operat- ing instructions. Notice all warning labels on the freezer. Wear proper clothing. Avoid loose fitting garments, and remove watches, rings or jewelry which could cause a serious accident.
  • Page 18 Dispense Rate Adjusters The dispense rate adjuster limits the opening of the spigot. To adjust product dispense rate, turn the adjusting knob clockwise for slower flow and counter- clockwise for faster flow. High Head Pressure Cut Out If the head pressure exceeds 445 PSIG (28 bar) air cooled and water cooled, the high head pressure cutout will trip.

  • Page 19: Important Information Regarding Cleaning And Sanitizing

    3.3 IMPORTANT INFORMATION REGARDING CLEANING AND SANITIZING Soft serve and shake freezers require special consideration when it comes to food safety and proper cleaning and sanitizing. The following information specifically covers issues for cleaning and sanitizing frozen dessert freezers. This information is meant to supplement a comprehensive food safety program.

  • Page 20: Disassembly Of Freezer Parts

    As a recommended cleaner and sanitizer for your frozen dessert machine, STERA-SHEEN has proven to be one of the best daily maintenance products for: · CLEANING – Thorough removal of all solids including butterfat and milk fat. · MILKSTONE REMOVAL – Complete removal of milkstone.

  • Page 21: Cleaning Disassembled Parts

    Disassembly Of Front Door 1. Remove the front door by turning off the circular knobs and then pulling the front door off the studs. 2. Remove the air bleed valve by unscrewing the knob while holding the valve stem from behind. Remove the compression spring and push air bleed valve through the rear of the front door.

  • Page 22: Cleaning The Freezer

    3.7 CLEANING THE FREEZER CAUTION Risk of Product Damage Do not use acid cleaners, strong caustic compounds or abrasive materials to clean any part of the freezer exterior or plastic parts. The exterior should be kept clean at all times to preserve the lustre of the stainless steel.

  • Page 23: Figure 18 Front Door Assembly

    Assemble O-rings onto the spigot dry, without lubrication. Then apply a thin film of sanitary lubricant to the outside of the O-rings and spigot bodies. Install the spigots through the bottom of the front door ( see Figure 18). Figure 18. Front Door Assembly Assemble the air bleed valve O-ring onto the air bleed valves.

  • Page 24: Sanitizing

    3.9 SANITIZING Sanitizing must be done after the freezer is clean and just before the freezer is filled with mix. Sanitizing the night before is not effective. However, you should always clean the freezer and parts after using it. WARNING The United States Department of Agriculture and the Food and Drug Administration require that all cleaning and sanitizing solutions used with...

  • Page 25: Mix Information

    Mix Low Sensor Figure 21. Refrigerated Cabinet Place the mix pump switch in the ON position. The mix pump switch is located in the upper left hand corner, inside the refrigerated cabinet. Immediately open the spigot and let approximately 8 ounces of liquid mix with sanitizing solution drain out of the spigot.

  • Page 26: Operation Of Mix Pump

    3.12 OPERATION OF MIX PUMP The pump switch is located on the front of the freezer. When the pump switch is placed in the ON position, the mix pump motor will be actuated to pump mix into the freezer cylinder. When the set pressure is reached, the mix pump will shut off automatically.

  • Page 27: Figure 24 Removable Parts

    NOTE If the mix lines or air line is difficult to remove, soften with a rag soaked in hot water. Hose connections may be sprayed with Haynes Sanitary Lubricant for ease of removal. Do not loosen or remove the mix pump cover wingnuts.

  • Page 29: Section 4

    4.1 FREEZER ADJUSTMENT This section is intended to provide maintenance person- nel with a general understanding of the freezer adjust- ments. It is recommended that any adjustments in this section be made by a qualified person. 4.2 PRODUCT TEMPERATURE ADJUSTMENT A potentiometer is used to control the product tempera- ture.

  • Page 30: Mix Pump Hose Reposition

    F. Tighten the allen screw, then place the wrench back in its clip. Replace the lower back panel and secure with the four screws. Turn the mix pump power switch to the ON position. 4.4. MIX PUMP HOSE REPOSITION (every one or two weeks.) NOTE Mix pump hose must be repositioned every 1 - 2...

  • Page 31: Condenser Cleaning (Air Cooled Freezers)

    Remove either side and back panels. Press firmly on one belt. Figure 31. Figure 31. Belt Adjustment When the tension is properly adjusted, the outside of the depressed belt should be approximately in line with the inside of the other belt. If an adjustment is necessary, loosen the four motor plate retaining nuts, adjust belt tension then re tighten the four nuts.

  • Page 32: Troubleshooting

    For water-cooled freezers that are left in unheated buildings, or buildings subject to freezing, the water must be shut off and disconnected. Disconnect fittings at water valve inlet and water outlet lines at the freezer. The fittings are located at the rear of the freezer.
  • Page 33 k " , " t n i l n i l . t u . t f t i s l i s ) . y s t l p i l n i l FREEZER . f f a t l e l l .

  • Page 34: Mix Pump

    . f f a t l i t c i t c . x i . y l . x i . x i e l l . r i . x i " " 2 MIX PUMP . y l o l l o l l "...
  • Page 35 . y l . y l s ' r . y t " t " t & t f i s t i & / r i / r i t t i f y l l y l t "...

  • Page 37: Section 5

    5.1 HOW TO ORDER REPLACEMENT PARTS To assure the receipt of the proper replacement parts, supply your serviceperson with the following information: Model number of equipment. Serial number of model (stamped on nameplate) Item Stoelting P/N Qty. Description 2177427 Door (Side ID Grooves) 2177072 38mm (1.5 inch) Spigot Ext.
  • Page 39 AUGER PARTS Drawing Part Index No. Number Qty. 2104552 149003 381804 694255 4151178 624678 1151859 667868 MISCELLANEOUS PARTS Description Haynes Spray 12 oz.(340 grams) -------------------- 508017 Petro-Gel Tube 4 oz. (113 grams) -------------------- 508135 Spline Lubricant 2 oz. (57 grams) -------------------- 508048 Brush 4"x 8"x16"...
  • Page 40 Figure 7. Mix Pump...
  • Page 41 Wired According to, on elec. schematic envelope 130000 Elec. Schematic Envelope 324065 Water Inlet - Back panel above inlet coupling 324803 Header Panel Decal (Stoelting Logo) 324804 Header Panel Decal (Stoelting Swirl) 324806 Header Panel Decal (A & W Logo)
  • Page 51 Stoelting, LLC warrants to the first user (the “Buyer”) that the freezer cylinders, hoppers, compressors, drive motors, speed reducers, auger and auger flights of Stoelting soft serve / shake freezers will be free from defects in materials and workmanship under normal use and proper maintenance appearing within five (5) years, and that all other...

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