Stoelting U421/U444 manual

Model U421/U444 (Serial #17978 and up) OWNER'S MANUAL Manual No. 513595-4 July , 2004 Rev . 1[...]

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Need Part s or Service? We stock the parts you need.  Our Technicians are factory trained and are certified in the Stoelting Technicare program. Model No.: _______________________ Serial No.: _______________________ Purchase Date: ____________________ Start-Up Date:____________________ CALL Distributor: _________________________ Phone No.: _____[...]

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STOELTING, LLC Tele: 920-894-2293 502 Hwy 67 Kiel, WI 53042-1600 Fax: 920-894-7029 STOEL TING ® OWNER'S MANUAL FOR MODEL U421/U444 CAB MODEL SOFT-SERVE PRESSURIZED FREEZER This manual provides basic information about the freezer. Instructions and suggestions are given covering its basic operation and care. The illustrations and specifications[...]

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Section 1 .............................................................................................................. 1 1.1 Description .............................................................................................. 1 1.2 Specifications .......................................................................................... 2 Se[...]

ILLUSTRA TIONS Figure 1 Model U421/U444 Series Freezer ......................................... 1 Figure 2a Air-Cooled Specifications ...................................................... 2 Figure 2b Water-Cooled Specifications ................................................. 2 Figure 3 Decal Locations ...........................................[...]

Safety Alert Symbol: This symbol Indicates danger , warning or caution. Attention is required in order to avoid serious personal injury . The message that follows the symbol contains important information about safety . Signal Word: Signal words are distinctive words used throughout this manual that alert the reader to the existence and relative de[...]

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1 SECTION 1 INTRODUCTION 1.1 DESCRIPTION The Stoelting U421 and U444 floor model freezers are pres- sure fed. The freezers are equipped with fully automatic controls to provide a uniform product. The U421 freezer is designed to operate with almost any type of commercial soft serve or non-dairy mixes available, including ice milk, ice cream, yogurt,[...]

2 Figure 2a. Air-Cooled Specification Figure 2b. Water Cooled Specification[...]

3 SECTION 2 INSTALLATION INSTRUCTIONS 2.1 SAFETY PRECAUTIONS Do not attempt to operate the freezer until the safety precautions and operating instructions in this manual are read completely and are thoroughly understood. Take notice of all warning labels on the freezer. The labels have been put there to help maintain a safe working environment. The[...]

4 2.2 SHIPMENT AND TRANSIT The freezer has been assembled, operated, and in- spected at the factory . Upon arrival at the final destina- tion, the freezer must be checked for any damage which may have occurred during final transit. With the method of packaging used, the equipment should arrive in excellent condition. THE CARRIER IS RESPON- SIBLE FO[...]

5 2.5 MIX PUMP A . 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. Gently push the hose into the black cover until it begins to feed. 4. Allow the hose to feed itself thru the pump until 6" (15cm) r[...]

6 B . Connect 1/2 inch (12,7mm) I.D. plastic food grade tubing to check valve and then to the mix con- tainer. Observe check valve flow arrow. Secure with hose clamps. Then place assembly thru hole in cover and install retainer clip. Figure 9. C. Connect 1/2 inch (12,7mm) I.D. plastic food grade tubing between the large port of air/mix tee and refr[...]

7 Figure 8. 3-way Tee Figure 9. Mix Inlet Tube & Probe Assy. Clip Refrigerated Mix Transfer Line Å Å Å Å Å Large Port (Air/Mix) 3-way Tee Æ Æ Æ Æ Æ Low Mix Cord Cover Retainer Clip Mix Container Ì Ì Ì Ì Ì É É É É É Ç Ç Ç Ç Ç Hose Holder Figure 10. Hose Holder Å Å Å Å Å È È È È È[...]

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9 SECTION 3 INITIAL SET-UP AND OPERATION 3.1 SAFETY PRECAUTIONS SAFE OPERA TION IS NO ACCIDENT ; observe these rules: A. Know the freezer . Read and underst and the operat- ing instructions. B. Notice all warning labels on the freezer . C. Wear proper clothing. Avoid loose fitting garment s, and remove watches, rings or jewelry which could cause a [...]

10 When the switch is placed in the OFF position, the refrigeration system and auger will not operate. When the switch is placed in the SERVE position, the refrigeration system and auger will operate auto- matically. The switch should be placed in the SERVE position for normal operation. C. Cabinet-Off-On Switch The CABINET-OFF-ON switch is a two p[...]

11 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 [...]

12 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. · SANITIZING – FDA-approved no rinse sanitizer for food co[...]

13 A. Disassembly Of Front Door 1. Remove the front door by turning off the black 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 . 3. Remove the spigot through[...]

14 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. A good grade of stainless steel has been used on the freezer to [...]

15 H . Install the spigot through the bottom of the front door ( see Figure 18). Figure 18. Front Door Assembly I . Assemble the air bleed valve O-ring onto the air bleed valves. Position the O-ring in groove close to the wide part. Apply a thin film of sanitary lubricant to the O-rings. J . Insert the air bleed valve from the back of the front doo[...]

16 A . Prepare 3 gallons of sanitizing solution following manufacturer's instructions, and pour into storage container . B . Place the mix pump switch in the ON position and open air bleed valve on the front door by pushing valve in and holding (see Figure 19). C. Let sanitizing solution fill the freezer barrel to air bleed valve, then close t[...]

17 The freezer is designed to dispense the product at a reasonable draw rate. If the freezer is overdrawn, the result will be a soft product and air pops. If this should occur , allow the freezer to run for approximately 30 seconds before dispensing additional product. After a while the operator will sense or feel when the freezer is beginning to f[...]

18 C. The over-run adjustment is preset at the factory. If an adjustment becomes necessary, refer to Section 4. 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 reac[...]

19 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. Maintain the mix pump hose in its operational condition. 1. Loosen clamp and remove air hose from pump compresso[...]

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21 SECTION 4 MAINTENANCE INSTRUCTIONS 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 te[...]

22 CAUTION UTION Never disconnect hoses from freezer or pump with- out first opening spigot to relieve pressure. 3. Disconnect mix pump hose at each end. 4. Grasp the discharge hose end with one hand and turn the pump on. Pull down on the hose until all of the remaining hose is removed from the pump. 5. Connect new mix pump hose to pick-up hose ada[...]

23 A. Remove either side and back panels. B. Press firmly on one belt. Figure 29. Figure 30. Belt Adjustment C. When the tension is properly adjusted, the outside of the depressed belt should be approximately in line with the inside of the other belt. D. If an adjustment is necessary, loosen the four motor plate retaining nuts, adjust belt tension [...]

24 D. 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. Run the compressor for 2 - 3 minutes to open water valve. Blow out al[...]

25 FREEZER M E L B O R P E S U A C E L B I S S O P R E Z E E R F Y D E M E R ) r e g u a ( r o t o m e v i r D s e o d r o , " t u o - s k c i k " . n u r t o n . f f o s i r e z e e r f o t r e w o P . 1 . d e d a o l r e v o r o t o m e v i r D . 2 . e g a t l o v e n i l w o L . 3 . d r a h o o t t c u d o r P . 4 . y l e r u c e s d e[...]

26 MIX PUMP N U R T O N S E O D R O T O M P M U P . 1 . f f o s i p m u p o t r e w o P . p m u p o t r e w o p y l p p u S . e g a t l o v w o L . e g a t l o v e n i l w o l r o f k c e h C . p m a l c / r e v o c k c a l b e d i s n i d e m m a j e s o h p m u p x i M r u o f e v o m e R . e c r u o s r e w o p m o r f p m u p t c e n n o c s i [...]

27 P M U P H G U O R H T D E E F T ' N O W E S O H P M U P X I M T N E M E C A L P E R . 5 . r e v o c p m u p x i m f o e l o h e g r a h c s i d o t n i e s o h g n i d e e F . r e v o c f o e d i s p u - k c i p o t n i e s o h d e e F . y l e r a u q s t u c t o n s d n e e s o H . ) s l i a t o n ( y l e r a u q s f f o d n e e s o h t u [...]

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29 SECTION 5 HOW TO ORDER REPLACEMENT PARTS 5.1 HOW TO ORDER REPLACEMENT PARTS To assure the receipt of the proper replacement parts, supply your Authorized Stoelting Distributor with the following information: A . Model number of equipment. B . Serial number of model (stamped on nameplate) C. Part number, part name, and quantity needed. NOTICE Min[...]

30 Drawing Index No. Part No. Description 7 625133 O-ring, Front Door 1 1 624520 O-ring, Air Bleed V alve 1 2 694200 S pring, Air Bleed V alve 1 3 482004 Knob, Air Bleed, Black 1 4 2 1 1 0 1 1 6 S tem, Air Bleed V alve 1 5 1 1 0 7 1 2 3 Spigot Handle 1 6 570998 Retaining Pin 17 2146293 Spigot Extension, 2.1 2157892 Spigot Extension, 1.5 2143024 Spi[...]

31 AUGER P ARTS Drawing Part Index No. Number Qty . Description 1 2104552 1 Auger Front Support 2 149003 1 Front Bearing 3 381804 6 Plastic Flight 4 694255 6 Spring 5 4151 178 1 Auger 6 624678 1 Rear Seal O-ring 7 1 151859 1 Rear Seal Adaptor 8 667868 1 Rear Seal MISCELLANEOUS P ARTS Description Part No. Haynes Spray 12 oz.(340 grams) -------------[...]

32 Figure 7. Mix Pump[...]

33 DECALS Qty . Part Number Description 2 324200 H . P . Manual Reset 2 324798 Clean-Off-Serve 2 324797 Standby/Serve 1 324800 Cab Off-On 2 324799 Pump Off On 1 324141 Caution, Haz. Rot. Blade - Front Panel 1 324509 Cleaning - Right Side 2 324014 Auger Rotation - Evap. Enclosure Rear 4 324686 Danger - Start Auto, on Evap. Support between belts &[...]

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35 GENERAL ORDER ADVICE Customer No.: ________________ Customer P .O. No.: ________________ Stoelting Order No.: ______________ Sold T o: _____________________________________ Date: __________________________________________ ____________________________________________ Ship T o: ________________________________________ _____________________________[...]

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3 7 GENERAL ORDER ADVICE Customer No.: ________________ Customer P .O. No.: ________________ Stoelting Order No.: ______________ Sold T o: _____________________________________ Date: __________________________________________ ____________________________________________ Ship T o: ________________________________________ ____________________________[...]

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W ARRANTY SOFT SERVE / SHAKE FREEZERS 1. Scope: 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 ap[...]