Stoelting U431 series User manual

Model U431 (Serial #17978 and up)
OWNER'S MANUAL
Manual No. 513568-4 May 2004, Rev. 0

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STOELTING, LLC Tele: 920-894-2293
502 Hwy 67
Kiel, WI 53042-1600 Fax: [phone]
STOELTING®OWNER'S MANUAL
FOR
MODEL U431
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.
Theillustrationsandspecificationsarenotbindingindetail. Wereservetherighttomakechanges
atanytimewithoutnotice,tothefreezeranditscomponents,withoutincurringanyobligationtomodify
orprovide newparts forfreezers builtprior todate ofchange.
DONOTATTEMPTtooperatethefreezeruntilinstructionsandsafetyprecautionsinthismanualare
readcompletelyandarethoroughlyunderstood. Ifproblemsdeveloporquestionsariseinconnection
withinstallation,operationorservicingofthefreezer,contactthecompanyatthelocationlistedbelow.

TABLE OF CONTENTS
Section 1 .............................................................................................................. 1
1.1 Description.............................................................................................. 1
1.2 Specifications.......................................................................................... 2
Section 2 .............................................................................................................. 3
2.1 SafetyPrecautions .................................................................................. 3
2.2 Shipment &Transit .................................................................................. 4
2.3 FreezerInstallation................................................................................... 4
2.4 Installing PermanentWiring...................................................................... 4
2.5 Mix Pump ................................................................................................ 5
Section 3 .............................................................................................................. 9
3.1 SafetyPrecautions .................................................................................. 9
3.2 OperatingControls andIndicators............................................................ 9
3.3 ImportantInformation RegardingCleaningandSanitizing......................... 11
3.4 Disassemblyof Freezer Parts.................................................................. 12
3.5 Cleaning Disassembled Parts ................................................................. 13
3.6 SanitizeFreezerParts ............................................................................. 13
3.7 Cleaningthe Freezer ............................................................................... 14
3.8 AssemblingtheFreezer........................................................................... 14
3.9 Sanitizing ................................................................................................ 16
3.10 InitialFreeze downandOperation............................................................ 16
3.11 MixInformation ........................................................................................ 17
3.12 OperationofMix Pump ............................................................................ 18
3.13 MixPump Cleaning ................................................................................. 18
3.14 Disassemblyand InspectionofRemovable Parts..................................... 18
Section 4 .............................................................................................................. 21
4.1 Freezer Adjustment ................................................................................. 21
4.2 ProductTemperatureAdjustment ............................................................. 21
4.3 OverrunAdjustment ................................................................................. 21
4.4 Mix PumpHoseReposition ..................................................................... 22
4.5 MixPump HoseReplacement.................................................................. 22
4.6 CabTemp.Adjustment............................................................................. 22
4.7 DriveBeltTensionAdjustment.................................................................. 22
4.8 Condenser Cleaning(Air Cooled Freezers) ............................................. 23
4.9 PreventativeMaintenance........................................................................ 23
4.10 ExtendedStorage ................................................................................... 23
4.11 Troubleshooting ....................................................................................... 24
Section 5 .............................................................................................................. 29
5.1 How toOrderReplacement Parts ............................................................ 29
5.2 PartsLists and ReferenceDrawings........................................................ 29

ILLUSTRATIONS
Figure 1 ModelU431 Freezer ..............................................................1
Figure 2 Specifications........................................................................1
Figure 3 Decal Locations.....................................................................3
Figure 4 Water/ElectricalConnections .................................................4
Figure 5 AugerRotation.......................................................................4
Figure 6 MixHoseInstallation...............................................................5
Figure 7 MixPump...............................................................................6
Figure 8 3-wayTee..............................................................................7
Figure 9 MixInletTube &ProbeAssy.Clip...........................................7
Figure 10 HoseHolder...........................................................................7
Figure 11 OperatingControls.................................................................9
Figure 12 AugerFlight Wear& FrontAuger SupportBushingWear .......12
Figure 13 FrontDoor Disassembly ........................................................13
Figure 14 AugerFlightRemoval.............................................................13
Figure 15 RearSealRemoval................................................................13
Figure 16 RearSeal Lubrication ............................................................14
Figure 17 SpringInstallation...................................................................14
Figure 18 FrontDoorAssembly .............................................................15
Figure 19 Air Bleed Valves ....................................................................16
Figure 20 DrainingSanitizer ..................................................................16
Figure 21 RefrigeratedCabinet .............................................................17
Figure 22 DispensingProduct ...............................................................17
Figure 23 MixPumps.............................................................................18
Figure 24 RemovableParts ...................................................................19
Figure 25 CleaningAirTube ..................................................................19
Figure 26 CleaningFeedTube ..............................................................19
Figure 27 MixPumpTubeRouting .........................................................19
Figure 28 Potentiometer ........................................................................21
Figure 29 OverrunAdjustment................................................................21
Figure 30 TemperatureControlCab ......................................................22
Figure 31 BeltAdjustment ......................................................................23

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
ornon-dairy mixesavailable,including icemilk, icecream,
yogurt, and frozen dietary desserts.
Thismanual isdesignedto assistqualified personneland
operators in the installation, operation and maintenance
of the Stoelting Model U431 pressure freezer.
Figure 1. Model U431 Freezer
Figure 2. Specification

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1.2 SPECIFICATIONS