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

2
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1.2 SPECIFICATIONS

3
SECTION 2
INSTALLATION INSTRUCTIONS
2.1 SAFETY PRECAUTIONS
WARNING CAUTION
Donotattempt to operatethefreezer until thesafetypre-
cautionsand operatinginstructionsin themanual areread
completely and are thoroughly understood.
Takenotice ofallwarninglabelson thefreezer (Fig.3).The
labels have been put there to help you maintain a safe
working environment. The labels have been designed to
withstand washing and cleaning. All labels must remain
legiblefor thelife ofthefreezer. Labelsshould bechecked
periodically to be sure they have not been painted over,
rubbed off, fallen off, and can be recognized as warning
labels.
Ifyouare in needofreplacement labels, indicatethepart
number, type of label, location of label, and quantity re-
quired along with your name and address and mail to:
Stoelting, LLC
Commercial Products
502 Hwy. 67
Kiel, WI 53042
Figure 3. Decal Locations

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
RESPONSIBLE FOR ALL DAMAGE IN TRANSIT,
WHETHER VISIBLE OR CONCEALED. Do not pay the
freight bill until the freezer has been checked for dam-
age. Have the carrier note any visible damage on the
freightbill. If concealeddamageand/or shortageisfound
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
WARNING
INSTALLATION MUST BE PERFORMED BY A
QUALIFIED ELECTRICIAN/REFRIGERATION
SPECIALIST. INCORRECT INSTALLATION WILL
VOID THE WARRANTY, AND MAY CAUSE SE-
VERE DAMAGE TO THE MACHINE. MAY
CAUSE PERSONAL INJURY.
Installation of the freezer involves moving the freezer
closetoits permanent location, removingallcrating, set-
ting in place, assembling parts, and cleaning.
A. Uncrate the freezer.
B. Install the four casters. Turn the threaded end into
the freezer until zero threads are showing.To level,
turn out casters no more than 1/4" maximum, then
tighten all jam nuts.
C. The freezer must be placed in a solid level position.
NOTE
Accuratelevelingis necessary forcorrect drainage
of freezer barrel and to insure correct overrun.
D. The freezer must have a minimum of 3" (7,5cm)
-6" (15cm) high ambient conditions- of space on all
sides and 10" (25cm) at the top for proper circula-
tion.
CAUTION
FAILURE TO PROVIDE ADEQUATE VENTILA-
TION WILL VOID WARRANTY!
E. Water-cooled freezers need an adequate water
supply. Install 1/2" (12,7mm) pipe or 1/2" (12,7mm)
inside diameter copper water line to the freezer.
Connect water outlet to a drain using a 1/2"
(12,7mm) inside diameter line. Automatic washer
hoses work well for final connections. All water
connections must comply with local codes. Fig. 4.
CAUTION
FLUSH ALL WATER LINES BEFORE INSTALLA-
TION. IN STORES WITH SEDIMENT IN WATER,
ADD SUITABLE FILTER OR STRAINER TO WATER
INLET.
Figure 4. Water/Electrical Connections
F. Place theCLEAN-OFF-SERVEswitches in theOFF
position before continuing. Figure 11.
2.4 INSTALLING PERMANENT WIRING
Permanent wiring is required by local codes, the follow-
ing procedure must be performed:
A. Refer to the nameplate at the rear of the freezer for
specificelectricalrequirements.Makesurethepower
source in the building matches the freezer name-
platerequirements.Bringthewiresintothejunction
boxesthroughtheaccessholesinthebottomrearof
the freezer. Figure 4.
NOTE
Threephasefreezers in areas ofunbalanced elec-
tricalloads require specialattentionwhen connect-
ing input electrical power. The unbalanced leg of
power (called wild or high) must be connected to
L2 in the junction box.
B. Remove the lower back panel and the two junction
box covers located at the bottom of the freezer.
C. lnstall permanent wiring according to local code.
D. Check the auger shaft rotation by placing the MAIN
DRIVE switch in the CLEAN position. Auger shaft
rotation is clockwise as viewed through the clear
plastic front door. If the rotation is not clockwise,
turn main electrical power OFF. Then reverse L1
and L3 electrical power lines to the junction box
(three phase only). Re-check auger shaft rotation.
Figure 5.
Figure 5. Auger Rotation

5
2.5 MIX PUMP
A. Mix Pump Hose Installation
Followthestepsbelowtoinstallthemixpumphose.
1. Turn pump on.
2. Feedoneendofmixpumphoseintotheentering
or pick-up hose side (left) of black cover.
3. Gently push the hose into the black cover until it
begins to feed.
Figure 6. Mix Hose Installation
4. Allow the hose to feed itself thru the pump
until6"(15cm)remainsontheenteringside.
5. Turn pump off.
6. Connect mix pump hose to pickup hose
adapter using small hose clamp.
CAUTION
DO NOT TWIST MIX PUMP HOSE.
7. Turn pump on.
8. Allowremaining6"(15cm)oftubingtofeedthrupump
until hose adapter prevents further feeding.
9. Turn pump off.
10.Connectfreeend of mixpumphose to 3-way
Tee as shown in Figure 7. When all connections
are complete the 3- way Tee must be lower than
the black pump housing. Figure 8.
6" (15cm)

6
Figure 7. Mix Pump
B. Connect1/2inch(12,7mm)I.D.plasticfoodgrade
tubingtomix check valve (Item7) and then tothe
mixcontainer.Observecheckvalveflowarrow.
Secure with hose clamps. Then place assembly
thru hole in cover and install retainer clip. See
Figure9.
C. Connect1/2inch(12,7mm)I.D.plasticfoodgrade
tubing between the large port of air/mix tee and
refrigerated mix transfer line. Secure with large
hoseclampor equivalent.SeeFigure9.
CAUTION
AIR/MIX TEE MUST REMAIN BELOW THE
BLACK COVER/CLAMP. IF THE TEE IS
ABOVE THE PUMP MIX WILL DRAIN TO THE
AIR COMPRESSOR RESULTING IN PUMP
DAMAGE.
D. Connect mix low cords. Figure 9.

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

8

9
SECTION 3
INITIAL SET-UP AND OPERATION
3.1SAFETY PRECAUTIONS
SAFE OPERATION IS NO ACCIDENT; observe these
rules:
A. Know the freezer.Read andunderstandtheoperat-
ing instructions.
B. Notice all warning labels on the freezer.
C. Wear proper clothing. Avoidloose fittinggarments,
andremovewatches, rings orjewelry which could
cause a serious accident.
D. Maintain a clean work area. Avoid accidents by
cleaning the area and keeping it clean.
E. Stay alert at all times. Know which switch, push
button or control you are about to use and what
effect it is going to have.
F. Disconnect electrical power for maintenance.
Neverattempt to repairor performmaintenance on
the freezer until the main electrical power has been
disconnected.
G. Do not operate under unsafe operating condi-
tions. Neveroperatethisfreezerif unusualorexces-
sivenoise or vibrationoccurs.
3.2 OPERATING CONTROLSAND INDICATORS
Beforeoperatingthe freezer,itis required thatthe opera-
tor know the function of each operating control. Refer to
Figure 11 for the location of the operating controls on the
freezer.
Figure 11. Operating Controls
Clean-
Off-Serve
Standby-
Serve
Cab Indicator
Light Pump Switch
Low Mix
Light
Clean-
Off-Serve
Standby-
Serve
Freezing
Dispense Rate
Adjusters
Low
Mix
Light
Cab
Off-On
WARNING
The CLEAN-OFF-SERVE switch must be placed
in the OFF position when disassembling for
cleaning or servicing. The freezer must be dis-
connected from electrical supply before remov-
ing any access panel.
A. Spigot Switch
Whenthespigot handle is openedtheSPIGOT
switchwillstarttheaugerdriveandrefrigeration
systems.Whenthespigothandleisclosed,thedrive
B. Clean-Off-Serve Switch
TheCLEAN-OFF-SERVEswitch is a threeposition
toggle switch used to control the operation of the
refrigeration system and auger. When the switch is
placedin theCLEAN position,the refrigerationsys-
tem will be off and auger will rotate for cleaning.
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,
therefrigerationsystemandaugerwilloperateauto-
matically.TheswitchshouldbeplacedintheSERVE
positionfornormaloperation.
C. Cabinet-Off-OnSwitch
TheCABINET-OFF-ONswitch isatwo position
toggleswitch.When theswitchis placedintheOFF
position, thelower cabinetrefrigeration system will
not run. When the switch is placed in the ON
position, thelower cabinetrefrigeration system will
rununtilthe preset temperatureis reached; then
cycle ON and OFF to maintain that temperature.
D. Cab Indicator Light
A flashing light indicates the cab OFF-ON switch is
intheOFFposition,norefrigeration.PlacetheOFF-
ONswitchin the ONposition for cab refrigeration.
E. Pump Switch
The pump motor switch is a two position toggle
switch. When the switch is placed in the OFF
position, the pump will not run. When the switch is
placedintheONposition,thepumpwillrununtilthe
presetpressureisreached,thencycleONandOFF
as product is drawn to maintain that pressure.
F. Standby/Serve Switch
The standby/serve switch is a two position toggle
switch. When the switch is placed in the Standby
position the freezer will cycle to maintain a
temperature below 41°F. When the switch is in the
Serve position the freezer will cycle to maintain a
servableproduct.
G. Freezing Switch
The freezing switch is a two position toggle switch.
When the switch is placed in the ON position
thefreezerwillbeforcedtorun30secondsafterthe
temperaturecontrolissatisfied.

10
H. DispenseRateAdjusters
Thedispenserate adjuster limitsthe opening ofthe
spigot. To adjust product dispense rate, turn the
adjustingknobclockwiseforslowerflowandcounter-
clockwisefor fasterflow.
I. High Head Pressure Cut Out
Ifthe headpressure exceeds445 PSIG(28 bar)air
cooledandwatercooled,thehighheadpressure
cutout will trip. The reset button can be accessed
from the side of thefreezer.
J. Low Mix Light
Thelowmix lightwillilluminate whentheliquid level
in the mix container drops below two gallons.
K. Front Door Safety Switch
Thefrontdoorsafetyswitchpreventstheaugerfrom
turningwhenthefrontdoorisremoved.Theswitch
isopen whenthe dooris removedand closedwhen
the door is properly installed.

11
3.3IMPORTANTINFORMATIONREGARDING
CLEANINGANDSANITIZING
Softserveand shakefreezersrequirespecial
consideration when it comes to food safety and
propercleaningandsanitizing.
Thefollowinginformation specificallycoversissues
forcleaningandsanitizingfrozendessertfreezers.
This information is meant to supplementa
comprehensivefoodsafetyprogram.
Soil Materials Associated with Frozen Dessert
Machines
MILKFAT/BUTTERFAT–Ascomponentsofice-
cream/frozen custard mix, these soils will
accumulateon the interiorsurfaces ofthemachine
and its parts. Fats are difficult to remove and help
attributeto milkstone build-up.
MILKSTONE – Is a white/gray film that forms on
equipment and utensils that come in contact with
dairy products. These films will accumulate slowly
onsurfacesbecauseofineffectivecleaning,useof
hard water, or both. Milkstone is usually a porous
deposit, which will harbor microbial
contaminantsand eventuallydefysanitizing
efforts.
Once milkstone has formed, it is very difficult to
remove. Withoutusingthe correct product and
procedure, it is nearly impossible to remove a thick
layer of milkstone.
(NOTE:general-purposecleanersDONOTremove
milkstone.) This can lead to high bacteria counts
anda foodsafety dilemma.
IT IS BEST TO CONTROL MILKSTONE ON A
DAILYBASISBEFOREITCANBECOMEA
SIGNIFICANTFOODSAFETYPROBLEM.
In addition to food safety, milkstone can cause
prematurewear to machinepartswhich canaddto
costs for replacement parts or possibly more
expensiverepairsifwornmachinepartsarenot
replacedoncetheyhavebecomeexcessivelyworn.
Important Differences Between Cleaning and
Sanitizing
CLEANINGvs.SANITIZING
It is important to distinguish between cleaning and
sanitizing. Although these terms may sound
synonymous,they arenot. BOTHare requiredfor
adequatefoodsafetyandpropermachine
maintenance.
CLEANING
· Isthe removalofsoil materialsfrom asurface.
· Isaprerequisiteforeffectivesanitizing.
NOTE
An UNCLEAN surface will harbor bacteria that can
defysanitizing efforts.
Bacteriacandevelopand resistsanitizingefforts
within a layer of soil material (milkstone). Thorough
cleaningproceduresthatinvolvemilkstone
removalarecriticalforoperatorsoffrozen
dessertmachines.
SANITIZING
· Kills bacteria.
· Canbeeffectiveoncleansurfacesonly.
·DOESNOT cleanorremovemilkstone.
NOTE
Using a SANTITIZERon an unclean surface
willnot guaranteea clean andsafe frozen
dessertmachine.
Proper Daily Maintenance:
The Only Way to Assure Food Safety and
ProductQuality
Properdailymaintenancecaninvolveawidevariety
ofproductsandprocedures. Overall,theproducts
andproceduresfallintothreeseparatecategories.
(Please note that this is a brief overview intended for
informationalpurposesonly.)
1. CLEANING–Thisinvolvesdrainingmixfromthe
freezerbarrelandrinsingthemachinewith
water. Next, a cleaner is run through the
machine. Then, the machine is disassembled
andremovable parts aretaken tothesink for
cleaning.
2. MILKSTONE REMOVAL – Sincealmost all
cleanersdonot havetheability toremove
milkstone, the use of a delimer becomes
necessary. Although this procedure may not be
needed on a daily basis, it will usually follow the
cleaningprocedure. Itrequireslettinga delimer
solution soak in the machine for an extended
periodof time. Individualpartsarealsosoaked
ina delimingsolution foranextendedperiodof
time(more aboutdelimers inAdditional
Information).
3. SANITIZING–Afterthemachinehas been
cleaned and contains no milkstone, the
machineisreassembled. ThenaFDA-approved
sanitizing solution is run through the machine to
kill bacteria. The machine is then ready for food
preparation.

12
Asa recommendedcleaner andsanitizerforyour
frozendessertmachine,STERA-SHEENhasproven
to be one of the best daily maintenance products for:
·CLEANING–Thoroughremovalofallsolids
includingbutterfat and milkfat.
·MILKSTONEREMOVAL–Completeremovalof
milkstone.
·SANITIZING–FDA-approvednorinsesanitizer
forfoodcontactsurfaces.
Additional Information
THEUSEOFDELIMERS
A delimer is a strong acid that has the ability to
dissolve milkstone. This type of chemical may
becomenecessary oncehighlevels ofmilkstone
havedeveloped. Whiletheseproductsarevery
effectiveforremovingHIGHlevelsofmilkstone,they
arenot idealfor tworeasons:
1. PRODUCTSAFETY–Strongacidsare
dangerouschemicalsandhandlingthem
requiressafety
2. MACHINE DAMAGE –Strong acidswill attack
metalandrubbercausingprematurewearof
parts. The use of a delimer needs to be closely
monitoredtoavoiddamagetomachinesurfaces
andparts.
With proper daily use of STERA-SHEEN or it’s
equivalent,there is no need forthe use ofa
DELIMER.
DONOTUSEBLEACH
· BLEACHHASABSOLUTELYNOCLEANING
PROPERTIES.
· BLEACH IS CORROSIVE. It can and will
damagecomponentsofthemachinecausing
prematurewearandmetalcorrosion.
GENERALPURPOSECLEANERS
Generalpurpose cleaners donothave theability to
removemilkstone. Milkstonewill become a problem
if notremedied withadditional productsand
procedures.
THEUSEOFCHLORINETESTSTRIPS
“Teststrips” areused todetermine concentrationsof
active chlorine in sanitizing solutions. To use the
strips, tear off a small portion and submerge it into
the sanitizing solution. Then, compare the color
change to the color key on the side of the test strip
dispensertodeterminetheapproximatechlorine
concentration.
Theidealconcentration ofchlorineneedstobe100
ppm (as stated by the FDA).
NOTE
Follow the directions on the container for proper
concentration.
Thereare twomain factorsthat contributeto falling
chlorine concentrations in a sanitizing solution.
1. PRODUCT USE – As the chlorine in the
solutionisbeing used, chlorineconcentrations
fall.
2. TIME – As time passes, small amounts of
chlorine“evaporate”fromthesolution. (Thatis
why you can smell it.)
Sanitizing solutions should notbe allowed to fall
below100ppm chlorine. New solutionsshouldbe
mixedonceoldsolutionsbecomeineffective.
Figure 12. Auger Flight Wear & Front Auger
Support Bushing Wear
Wear Line
ÈÈ
ÈÈ
È
Beforeusingthefreezerforthefirsttime,completefreezer
disassembly,cleaningandsanitizingprocedureswillneed
tobefollowed.Routinecleaningintervalsandprocedures
must comply with the local and state health codes.
Inspection for worn or broken parts should be made at
every disassembly of the freezer for cleaning or other
purposes.Allwornorbrokenpartsshould bereplacedto
ensuresafety toboth the operatorand thecustomer and
tomaintaingoodfreezerperformanceandaqualityprod-
uct.Twonormalwearareasaretheaugerflightsandfront
augersupportbushing(seeFigure12).
To disassemble the freezer, refer to the following steps:
3.4 DISASSEMBLY OF FREEZER PARTS
WARNING
Moving machinery can grab, mangle and dis-
member. Place the CLEAN-OFF-SERVE toggle
switch in the OFF position before disassembling
forcleaning or servicing.Placing the CLEAN-OFF-
SERVE toggle switch in the SERVE position dur-
ing cleaning or servicing may result in serious
personal injury.