Vollrath STOELTING SU412 User manual

Model U412/SU412
SERVICE MANUAL
Manual No. 513630 V5
A VOLLRATH® DIVISION

White Glove Service Network
Phone: [phone]
Stoelting Foodservice Equipment
502 Highway 67
Kiel, WI 53042-1600 U.S.A.
SAFETY INFORMATION
This manual provides basic information about the safety,
operation, and service of the machine. This manual follows
the guidance set forth in the following industry standards:
ANSI Z535.6, ASTM F760-93, ASTM F1827-13, and the FDA
Food Code.
The illustrations and specifications in this manual are not
binding in detail. Stoelting Foodservice Equipment reserves
the right to make changes to the machine without notice, and
without incurring any obligation to modify or provide new parts
for machines built prior to date of change.
DO NOT ATTEMPT to operate the machine until all instruc-
tions and safety precautions in this manual are read com-
pletely and are thoroughly understood. The installation and
startup of this machine must be performed by a qualified
technician. The warranty will be void if the machine is not
installed correctly. For problems or questions with installa-
tion, operation, or servicing, contact Stoelting White Glove
Service — 1.800.319.9549.
Part No. 513630 9/27/2021
stoeltingfoodservice.com
© 2021 Stoelting
O
Service Manual
WARNING
“WARNING” indicates a potential hazard that can or will cause
severe injury or death if not avoided.
CAUTION
“CAUTION” indicates a potential hazard that can cause minor
or major injury if ignored.
“NOTICE” indicates equipment/property damage information.
It is not hazard-related.
“NOTE” indicates additional information, usually a hint or tip,
that is not hazard-related and does not involve equipment/
property damage.
If you need to replace a part, use genuine Stoelting parts
with the correct part number when possible. We strongly
recommend that you do not use replacement parts of inferior
quality.
For warranty information, visit www.stoeltingfoodservice.com.

TABLE OF CONTENTS
Section Description Page
 1 Description&Specications
1.1 Description.................................................................................................. 1
 1.2 Specications ............................................................................................. 2
1.3 Modes of Normal Operation ....................................................................... 3
1.4 Mix Level Indicators.................................................................................... 5
1.5 Storage Refrigeration ................................................................................. 5
1.6 Operation During Sensor Failure................................................................ 5
 1.7 MotorProleCutoutCompensation ........................................................... 5
1.8 IntellITec™ControlSettingSpecications ................................................... 6
2 Maintenance & Adjustments
2.1 Freezer Adjustment .................................................................................... 7
 2.2 ProductConsistencyAdjustment................................................................ 7
 2.3 LockingtheControlPanel .......................................................................... 7
 2.4 ObtainingReadings&ModifyingSettings(ServicePersonnelOnly) ......... 7
 2.5 Readings(ServicePersonnelOnly) ........................................................... 8
 2.6 Adjustments(ServicePersonnelOnly)....................................................... 9
 2.7 OtherSettings(ServicePersonnelOnly).................................................... 9
2.8 Overrun Adjustment.................................................................................... 10
2.9 Mix Pump Hose Reposition ........................................................................ 11
2.10 Mix Pump Hose Replacement .................................................................... 11
 2.11 CabTemperatureAdjustment ..................................................................... 12
2.12 Drive Belt Tension Adjustment.................................................................... 12
 2.13 CondenserCleaning(Air-CooledFreezers) ............................................... 13
2.14 Preventive Maintenance ............................................................................. 13
2.15 Extended Storage....................................................................................... 13
3 Refrigeration System
 3.1 RefrigerationSystem .................................................................................. 15
 3.2 RefrigerantRecovery&Evacuation ........................................................... 15
 3.3 RefrigerantCharging .................................................................................. 16
 3.4 Compressor ................................................................................................ 17
 3.5 Condenser .................................................................................................. 18
3.6 Evaporator .................................................................................................. 18
3.7 Valves ......................................................................................................... 18
 A. ThermostaticExpansionValve(TXV) ..................................................................18
 B. CheckValve .........................................................................................................19
 C. HighPressureCutout...........................................................................................19
 D. HotGasBypass ...................................................................................................20
 E. EvaporatorPressureRegulator(EPR).................................................................21
 F. WaterValve(WaterCooledModelsOnly)............................................................21
3.8 Solenoid...................................................................................................... 22

3.9 Filter Drier................................................................................................... 23
 3.10 CapillaryTube............................................................................................. 24
 3.11 CabUnit...................................................................................................... 24
4 Electrical & Mechanical Control Systems
4.1 IntelliTec™Controller ................................................................................... 25
 4.2 Contactors .................................................................................................. 25
4.3 Drive Motor ................................................................................................. 26
 4.4 Capacitors .................................................................................................. 26
4.5 Gearbox...................................................................................................... 27
 4.6 CondenserFanMotor(Air-CooledOnly).................................................... 28
 4.7 CabCondenserFanMotor ......................................................................... 28
4.8 Switches ..................................................................................................... 29
A. Spigot Switch .......................................................................................................29
B. Blender Activation Switch.....................................................................................30
 C. PumpPressureSwitch.........................................................................................30
 4.9 PotentialRelay ........................................................................................... 31
 4.10 TemperatureControlSensor ...................................................................... 31
 4.11 SpinnerSpeedControlHarness................................................................. 31
5 Troubleshooting
 5.1 ErrorCodes ................................................................................................ 33
 5.2 Troubleshooting-ErrorCodes ................................................................... 33
 5.3 Troubleshooting-Machine ......................................................................... 36
 5.4 Troubleshooting-MixPump....................................................................... 37
6 Replacement Parts
6.1 Auger & Front Door Parts ........................................................................... 39
 6.2 BlenderParts&Trays................................................................................. 40
 6.3 CabTubingAssembly................................................................................. 41
 6.4 SpigotCamAssembly ................................................................................ 42
6.5 Front Panel ................................................................................................. 43
6.6 Part Kits ...................................................................................................... 43
6.7 Pump Parts................................................................................................. 44
 6.8 CabInterior................................................................................................. 46
 6.9 HeaderPanel-Electrical............................................................................ 47
6.10 Left Hand Side............................................................................................ 48
6.11 Right Hand Side ......................................................................................... 49
6.12 Rear............................................................................................................ 50
6.13 Brushes, Decals & Lubrication ................................................................... 51
6.14 Stainless Steel Panels................................................................................ 51
6.15 Refrigeration & Wiring Diagrams ................................................................ 52
Section Description Page

Operators Manual #513630 1 U412/SU412 Models
1.1 DESCRIPTION
TheU412andSU412areultrahighcapacityoormodel
shakemachines.Theyareequippedwithfullyautomatic
controls to provide a uniform product. This manual is de-
signedtoassistqualiedservicepersonnelandoperators
withinstallation,operationandmaintenanceoftheU412
andSU412machines.
SECTION 1
DESCRIPTION & SPECIFICATIONS
Figure 1-1 Model SU412 Machine
Figure 1-2 Machine Dimensions
19"
48.1cm
38 5/8"
98.2cm
67 1/4"
170.8cm
65 3/4"
167.1cm
REAR VIEWFRONT VIEW SIDE VIEW
Water Outlet
Air In
Air Out
Water Inlet

Operators Manual #513630 2 U412/SU412 Models
1.2 SPECIFICATIONS
Serial Number Date Codes
‘T’ & Later
Serial Number Date Codes
‘S’ & Earlier
Refrigerant R-448A* R-404A*
Charge A/C 34 oz
W/C 26 oz
A/C 32 oz
W/C 24 oz
Suction Pressure
(at 72°F) 24-26 psig 25-27 psig
Discharge Pressure 215-240 psig 210-235 psig
Cab Pressure
(only cab running) 18 psig (maintained by the bypass valve) 18 psig (maintained by the bypass valve)
EPR Valve 78-80 psig 78-80 psig
* Refer to the machine’s nameplate to confirm refrigerant
Models U412 & SU412
Dimensions Machine with crate
width 19’’ (48,3 cm) 27’’ (68,6 cm)
height 67-1/4’’ (170,8 cm) 78’’ (198,1 cm)
depth 38-5/8’’ (98,1 cm) 48’’ (121,9 cm)
Weight 450 lbs (204,1 kg) 550 lbs (249,4 kg)
Electrical 1 Phase, 208-240 VAC, 60Hz
circuit ampacity 18A minimum (U412), 19A minimum (SU412)
overcurrent protection
device 30A maximum
Compressor 11,000 Btu/hr Scroll™ Compressor
Drive Motor 3/4 hp
Air Flow Air cooled units require 3” (7,6 cm) air space on both sides, 6” back.
Plumbing Fittings Water cooled units require 1/2” N.P.T. water and drain fittings. Maximum water
pressure of 130 psi. Minimum water flow rate of 3 GPM. Ideal EWT of 50°-70°F
Hopper Volume 8 gallons (30,29 liters)
Freezing Cylinder
Volume 2.1 gallon (7,95 liters)

Operators Manual #513630 3 U412/SU412 Models
1.3 MODES OF NORMAL OPERATION
Following are details of the operational modes on the
U412andSU412.
NOTE:
Preset amounts, times, and temperatures listed
below describe actual settings on the IntelliTec™
control. Refer to Table 1-1 on page 6 for details on
each setting.
A. INITIAL STATUS
When the Main Freezer Power and Freezing Cylinder
switches are placed in the ON position, the machine will
startinthe“Sleep1Mode”.Thedisplaywillread“Sleep
1Mode”.Thecontrolwilleventuallymoveintothe“Sleep
2”modeifthePUSHTOFREEZEbuttonisnotpressed.
WhenthePUSHTOFREEZEbuttonispressedthecontrol
will move to the “Serve Mode”.
B. SERVE MODE
WhenthePUSHTOFREEZEbuttonispressedoraspigot
handle is pulled, the “Serve Mode” begins. The drive motor
starts,andaftera3seconddelay,thecompressorstarts.
Thedisplayreads“FREEZING”onthetoplineandabar
onthebottomlineincreaseswithproductconsistency.A
toroid on the IntelliTec™ control senses increasing drive
motoramperageastheproductcomestoconsistencyin
thefreezingcylinder.Whenthecontrolsensestheproduct
isat75%ofconsistency,thedisplaywillread“SERVE”,
the amber LED will go out and the green LED will blink.
At this time, product can be served from the machine.
The drive motor and compressor will continue to run until
the toroid reads a preset value (CutOut amps). When
thetoroidreadstheCutOutampsonthedrivemotor,the
compressorturnso󰀨.Aftera3seconddelay,thedrive
motorturnso󰀨.Theproductinthefreezingcylinderisnow
atserving temperature andconsistencyandthegreen
LED will remain lit.
After product is at consistency, the IntelliTec™ control
continuouslymonitorsrefrigeranttemperaturethrougha
thermistormountedonthesideofthefreezingcylinder.
Whenthetemperatureincreasestoapresetamount(Cut
InT),a3-seconddrivemotorpre-stiranalyzesproduct
consistency.Thepre-stircheckisalsoperformedeach
time the spigot handle is opened. This check prevents
over-freezingofproduct,especiallyduringfrequent,small
volumedraws.Ifproductrequiresafreezingcycle,the
controlwillstartthecycle.
Duringthe“ServeMode”,astircyclestarts.Thiscycleis
independentofthefreezingcycleandisbasedonpreset
times(StirOnandStirO󰀨).Thestircyclepreventsproduct
separation.Ifafreezingcycleisinitiated,thetimerisreset.
Inadditiontothe“ServeMode”freezingcycle,thereisa
freezingcyclebasedonapresettime(DftO󰀨Time).Ifthis
timeisattainedwithoutafreezingcycle,thecontrolwill
automaticallystartafreezingcycle.Ifafreezingcycleis
initiated, the timer is reset.
Themachinewillremainin“ServeMode”untilthecycle
countsettingisattained.Thecyclecountisthenumber
ofactivefreezingcyclesandisbasedonapresetvalue
(Cycles).Oncethecyclecounthasbeenreachedwithout
userinterruption,thecontrolwillmoveintothe“Standby
Mode”.
IfthePUSHTOFREEZEbuttonispressedoraspigot
handleispulled,thecyclecountisresetandthecontrol
will move to the beginning of the “Serve Mode”. Refer to
Figure1-3fora graphicalrepresentationofthe“Serve
Mode”.
C. STANDBY MODE
If product has not been drawn from the spigot and the
presetnumberofactivefreezingcyclesismet,thecontrol
movesintothe“StandbyMode”.In“StandbyMode”,the
freezingcycleisbasedonpresettimers(OnTimeandO󰀨
Time),andpreventsicecrystalsfrombuildingupinthe
product.Becausetheproduct remains partially frozen,
it can quickly return to servable consistency when the
PUSHTOFREEZEbuttonispressed.
During“StandbyMode”,thestircycleruns.Thiscycleis
basedonpreset,timedintervals(StirOnandStirO󰀨)and
prevents product separation.
Figure 1-3 Serve Mode
Figure 1-4 Standby Mode

Operators Manual #513630 4 U412/SU412 Models
The “Standby Mode” maintains product quality during
slow times, while minimizing reactivation time. This mode
lastsforapresettime(StbTime).Oncethistimehasbeen
reached without user interruption, the control moves into
the“Sleep1Mode”.RefertoFigure1-4foragraphical
representationofthe“StandbyMode”.
IfaspigotisopenedorthePUSHTOFREEZEbuttonis
pressed, the control will move to “Serve Mode”. Product
inthefrontofthefreezingcylindersmayormaynotbeat
consistency.Thestateoftheproductisdependentona
numberofvariablesbutwillcometoconsistencyquickly.
D. SLEEP 1 MODE
Afterthe“StandbyMode”timehasexpiredwithoutuser
interruption, the control will move into the “Sleep 1 Mode”.
Duringthe“Sleep1Mode”,thestircycleishandledby
presettimers(Sl1DrvOnandSl1DrO󰀨),andallowsproduct
tomelttoaliquidstatebyusingagitationcycleswithout
anyowofrefrigerant.Althoughtheproducttemperature
neverincreasesabove41°F,theproductthawsrapidly
whichminimizesproductbreakdown.Thecontrolwillstay
in the “Sleep 1 Mode” until sensing a preset temperature
(Sl2CutIn).Whenthistemperaturehasbeenreachedwith-
out user interruption, the control will move to the “Sleep 2
Mode”.RefertoFigure1-5foragraphicalrepresentation
of the “Sleep 1 Mode”.
IfaspigotisopenedorthePUSHTOFREEZEbuttonis
pressed, the control will move to “Serve Mode”. If the spigot
is opened in “Sleep 1 Mode”, the product will not be at
consistency.Theoperatormustwaituntiltherst“Serve
Mode”freezingcyclehascompletedtoserveproduct.
E. SLEEP 2 MODE
The “Sleep 2 Mode” maintains the freezing cylinder
temperaturebetween twopreset values (Sl2CutIn and
Sl2CtOut). During the “Sleep 2 Mode”, the stir cycle
runs.Thiscycleisbasedonpreset,timedintervals(Stir
OnandStirO󰀨)andpreventsproductseparation.The
“Sleep2Mode”isoftenreferredtobycustomersasthe
“nightmode”andthemachinewillstayinthismodeuntil
aspigotisopenedorthePUSHTOFREEZEbuttonis
pressed. When this occurs, the control will move to “Serve
Mode”. If the spigot is opened at this time, the product
willbeliquid.Theoperatormustwaituntiltherst“Serve
Mode” freezing cycle has completed to serve product.
RefertoFigure1-6foragraphicalrepresentationofthe
“Sleep 2 Mode”.
F. INTELLITEC™ RESTART
Ifaharderroroccurs(refertheharderrorlistbelow),the
IntelliTec™ control will wait 5 minutes then attempt to clear
theerrorbyrestartingitself.Thecontrolwillcounteach
restartattempt.TherestartcountwillresetifthePUSH
TOFREEZEbuttonispressed,thespigotispulled,or
the Freezing Cylinder OFF/ON switch is placed in the
OFF position.
The following are considered hard errors:
ERRORCODE MALFUNCTION
 2 HighTorque
3 Run Time
 4 Clean
7 Drive Motor
 9 HighPressureCutout
Whenarestartoccurs,thesecondlineofthedisplaywill
read “Restart” and the backlight will blink. This will occur
regardlessofthesystemmode.
G. SLEEP 3 MODE
Ifahightorque,runtime,ordrivemotorerrorcondition
occurs on the third restart attempt, the control will move
to the “Sleep 3 Mode”.
In“Sleep3Mode”freezingcylinderrefrigerationwillrun
for4secondsevery10minutes.Thisensurestheproduct
temperatureneverincreasesabove40°F.Thestircycle
and the auger do not run during “Sleep 3 Mode”.
The control will exit “Sleep 3 Mode” if the PUSH TO
FREEZEbuttonispressed,thespigotispulled,orthe
FreezingCylinderOFF/ONswitchisplacedintheOFF
position.
Figure 1-5 Sleep 1 Mode
Figure 1-6 Sleep 2 Mode

Operators Manual #513630 5 U412/SU412 Models
H. CLEAN MODE
When the CLEAN button is pressed, freezing cylinder
refrigeration stops, the drive motor starts and will run for
20minutesanda5minutecountdowntimerisdisplayed.
After the time has elapsed, an optional audible alarm will
soundifthisaccessoryhasbeeninstalled.Theaudible
alarmis areminderforthe operatortoendthe“Clean
Mode” when cleaning is completed.
Ifthemachineiskeptin“CleanMode”formorethan20
minutes, the auger drive motor stops, and an error code
(E4)isdisplayedonthedisplaypanel.The error code
prevents damage to the machine that could occur during
anextendedcleanmode(RefertoSection8-Trouble-
shootingfordetails).Toclearthiserror,placetheFreez-
ingCylinderO󰀨-OnswitchintheO󰀨positionandback
in the On position. If the machine is still being cleaned,
pushingtheCLEANbuttonwillresetthetimerandrestart
the“CleanMode”.
1.4 MIX LEVEL INDICATORS
Thecabinetisequippedwithacapacitivesensortomoni-
tor mix level. When the mix level drops below the sensor
limit,thelowerlineofthedisplaywillread“LowMix”and
thedisplaywillash.Toclearthe“LowMix”error,add
mix to the cabinet’s mix container.
1.5 STORAGE REFRIGERATION
The IntelliTec™ control is programmed to handle refrig-
eration of the cabinet independently from the freezing
cylinder. The control maintains cabinet temperature
betweentwopresetvalues (CabCutIn and CabCtOut).
Thecabinetwilloperateautomaticallyunlessoneofthe
following conditions are met:
If the Main Power switch is in the OFF position
theCabO󰀨lightonthefrontofthemachinewill
ash.
If the cabinet door is opened during a refrigeration
cycle,theevaporatorfanwillcontinuetorunbut
therefrigerationcyclewillbeinterruptedtoprevent
the evaporator coils from icing up.
 IfthereisaHighPressureCutoutError(E9)all
the refrigeration stops.
NOTE
If the temperature in the cabinet stays above 50°F
for more than two hours, the machine will go into
Sleep Mode and a clean message will be shown
on the display.
1.6 OPERATION DURING SENSOR FAILURE
The IntelliTec™ control is designed to allow the machine
to continue to function if a temperature sensor failure oc-
curs.Ifasensorfails,thedisplaywillshowtheerrorand
the control will run the machine on timers for the freezing
Figure 1-7 Serve Mode (Sensor Failure)
cycleorcabinetrefrigeration.Thisallowstheoperatorto
continue to serve product from the machine until proper
servicing can be completed.
A. SERVE & STANDBY MODE
In the event of a temperature sensor failure on a freezing
cylinder,theIntelliTec™controlwillfunctionintwomodes,
“ServeMode”and“StandbyMode”.Whentheproductis
atconsistencyin“ServeMode”,theIntelliTec™control
uses a timer instead of the sensor and will not start an-
otherfreezingcycleuntilapresetvalue(DftO󰀨Tm)ismet.
Thecontrolwillmonitorproductafteritisatconsistency,
activatingthestircycleandcountingthenumberofcycles.
Whenthecyclecountisreached,thecontrolwillmove
to“StandbyMode”.
The“StandbyMode”isthesameasinnormaloperation
withtheexceptionofwhenthepresettime(StbTime)is
met, the control moves back into the “Serve Mode”. Refer
toFigure1-7fordetails.
B. CABINET REFRIGERATION
In the event of a temperature sensor failure in the cabi-
net,thecabinetrefrigerationcycleismanagedbypreset
times(CabOnandCabO󰀨).Thisrefrigerationcycleis
independentofthefreezingcylinderrefrigerationandthe
cyclerestartsifthecabinetdoorisopened.
1.7 MOTOR PROFILE CUTOUT
COMPENSATION
TheIntelliTec™controlisprogrammedtoautomatically
functionatarangeofsupplyvoltages.Thisfeaturepro-
vides the advantage of having product maintained at a
specictemperatureandconsistencyirrespectiveofthe
supplyvoltage.Amotorprolecurveisprogrammedonthe
IntelliTec™ control and provides a relationship between
the supply voltage and drive motor cutout amperage.
Dependingonthesupplyvoltage,thecontrolvariescutout
amperageaccordingtothemotorprole.Thisfeatureis
automaticanddoesnotneedanyconguring.

Operators Manual #513630 6 U412/SU412 Models
Table1-1IntelliTecControlSettingSpecications
IntellITec™ControlSettingSpecications
Basic Menu DISPLAY Value MODE DEFINITION
CutOut * Serve Amp draw setting for cut out
CutInT 26.5°F Serve Temperature setting for cut in
Cycles 20 Serve FreezingcyclesbeforegoingintoStandbyMode
Stir On 15 sec Serve Stir-onlyontime
StirO󰀨 300 sec Serve Stir-onlyo󰀨time
Advanced Menu DISPLAY Value MODE DEFINITION
On Time 28 sec Standby Freezingcycle“on”time(runsontimersonly)
O󰀨Time 450 sec Standby Freezingcycle“o󰀨”time
Stb Time 120 sec Standby Total time in mode
Sl1DrvOn 120 sec Sleep 1 Drive motor “on” timer
Sl1DrO󰀨 180 sec Sleep 1 Drivemotor“o󰀨”timer
Sl2CutIn 37°F Sleep 2 Cutintemperature
Sl2CtOut 31°F Sleep 2 Cutouttemperature
DftO󰀨Tm 900 sec No Sensor Default“o󰀨”time.Usedincaseofsensorfailure
Storage Menu DISPLAY Value MODE DEFINITION
Refriger Cabinet All SettoNone,1Hopper,2Hopper,orCabinet
CabCutIn 38°F All Refrigerated cab cut in temperature
CabCtOut 34°F All Refrigerated cab cut out temperature
CabO󰀨 13 sec No Sensor Default“o󰀨”time.Usedincaseofsensorfailure
CabOn 130 sec No Sensor Default“on”time.Usedincaseofsensorfailure
*TheCutOutvalueneedstobeadjustedtoproductrequirements.Refertothe2183775-SpecicationSheetforSU412
Controllocatedintheplasticpouchbehindtheheaderpanel.

Operators Manual #513630 7 U412/SU412 Models
2.1 FREEZER ADJUSTMENT
This section is intended to provide maintenance personnel
with a general understanding of the freezer adjustments.
Itisrecommendedthatanyadjustmentsinthissection
bemadebyaqualiedperson.
2.2 PRODUCT CONSISTENCY
ADJUSTMENT
Theoperatorcanadjustproductconsistencybymodify-
ing the Fine Adjustment setting on the membrane switch.
Thisistheonlyadjustmentthatcanbemadebytheop-
eratorwithoutusingapasscodekeysequence.Product
consistencyneadjustmentallowsa0.4ampmaximum
adjustment to the drive motor amp draw cutout. Increasing
this setting will increase the drive motor amperage cutout
andincreaseproductconsistency.Followtheinstructions
belowtomakeneadjustmentstoproductconsistency.
A. Place the Main Freezer Power switch in the ON
position.
B. PresstheSETbuttonontheControlPanelonce.
FineAdjwillappearontheLCDscreen.
C. Presstheuparrowbutton(⇑) until the desired
consistencysettingisdisplayed.Thehigherthe
number,thermertheproductconsistency.The
controlmaybesetfrom1to9.Thevalueincreases
by1eachtimetheuparrowbuttonispressed.
After the value reaches 9, numbering restarts at
0. The 0 setting cannot be set.
D. Press the SET button once to save the setting
andreturntothecurrentmodedisplay.
SECTION 2
MAINTENANCE & ADJUSTMENTS
2.3 LOCKING THE CONTROL PANEL
The IntelliTec™ control has a tamper proof mode to
prevent unauthorized use. When set, all buttons on the
control panel are disabled. Follow the instructions below
to lock the control panel
A. Pressand holdthePUSHTOFREEZEbutton
for at least 5 seconds.
B. WhilestillholdingthePUSHTOFREEZEbutton,
presstheCLEANbuttononce.
C. Releasebothbuttons.Anasterisk(*)willappear
onthebottomlineofthedisplay,indicatingthat
the control is in the lock out mode.
NOTE:
Repeat steps A, B, and C to unlock the control
panel.
2.4 OBTAINING READINGS & MODIFYING
SETTINGS (SERVICE PERSONNEL ONLY)
Readings and settings on the IntelliTec control are ac-
cessed through the IntelliTec control menu settings.
Locatingfreezerreadingsandsystemfunctionsettings
aredoneusingtheuparrow(⇑)andleftarrow(⇐)but-
tons on the membrane switch.A printed IntelliTec™ Menu
Settings sheet is located in the information pouch behind
the header panel.
IntelliTec Control Readings
To obtain freezer readings, locate the value on the freezer’s
menu settings sheet and follow the steps below.
A. Press and hold the SEL button for 8 seconds. While
still holding the SEL button, press the up arrow
button(⇑).TheLCDscreenwillreadDISPLAY.
B. Release both buttons.
C. Presstheuparrowbutton(⇑)tonavigatetothe
correctreadingunderDISPLAYorpresstheleft
arrow(⇐)buttontonavigatetotheERRCODES
menu.
D. Presstheuparrow(⇑)andleftarrow(⇐)buttons
to navigate through the rest of the readings as
needed.
E. When all readings have been obtained, press
theuparrowbutton(⇑)fromExitMenutoreturn
tothecurrentmodedisplay.
Modifying Control Settings
To change the value of a system function, locate the
function on the IntelliTec Settings Menu and follow the
steps below.
Figure 2-1 Membrane Switch

Operators Manual #513630 8 U412/SU412 Models
IMPORTANT:
Before making changes to any settings, record
the original values. If the setting changes do not
achieve desired results, return settings to their
original values.
A. Press and hold the SEL button for 8 seconds. While
still holding the SEL button, press the up arrow
button(⇑).TheLCDScreenwillreadDISPLAY.
B. Release both buttons.
C. Presstheleftarrowbutton(⇐)togettothecorrect
menu(Basic,Advanced,orStorage).
D. Presstheuparrowbutton(⇑)tonavigatetothe
value that needs to be changed.
E. Press the SET button to enter the edit mode.
F. Press the up arrow button (⇑) to change the
setting.
G. Press the SET button to save the setting and exit
the edit mode.
H. Press the up arrow (⇑) and the left arrow (⇐)
buttons to navigate through the rest of the settings
as needed.
I. When all changes have been completed, press
theuparrowbutton(⇑)fromExitMenutoreturn
tothecurrentmodedisplay.
2.5 READINGS (SERVICE PERSONNEL
ONLY)
TheIntelliTec™controlcontinuouslymonitorsandrecords
temperatures, voltages, amps, and error code details.
Each reading is benecial to service personnel when
troubleshooting.
DISPLAY READINGS
FollowingarethereadingsavailableundertheDISPLAY
menu:
Cabinet
 Thetemperatureofthecabisconstantlymonitored
bytheIntelliTeccontrol.
Cycles (count)
 Thisreadingcountsdownthenumberofcycles
in the current “Serve Mode”. The starting value
is dependent upon the Cycles setting on the
IntelliTec control.
°F and amps
 Suctionlinetemperatureonthefreezingcylinder
and drive motor amps are available on the same
screen to assist with setup and troubleshooting.
Aux. Temp (°F)
This reading provides the ambient temperature
around the IntelliTec control board.
Supply V (VAC)
A calculated input voltage is recorded.
ERROR CODE READINGS
ThefollowingdetailsarerecordedundertheERRCODES
menu for each of the last 25 error codes received:
Err1 (hours)
A numerical count of the last 25 error codes is
recorded. When the 26th error has occurred,
the earliest error code is erased. A timer also
begins when an error occurs. The timer records
the number of hours since the error occurred. If
power to the freezer is interrupted, the timer will
stop until power has been restored.
°F and amps
The suction gas temperature on the freezing
cylinderandthedrivemotorampsarerecorded
at the time of the error.
Aux. Temp (°F)
Ambient temperature of the IntelliTec control board
is recorded at the time of the error.
Str (°F)
The storage temperature is recorded at the time
of the error.
VAC and Mode
A calculated input voltage and mode at which
the error occurred are recorded. Following are
descriptions of each mode:
Mode Description
 0 Startoffreezingcycle
 1 Compressoranddrivemotoron
 2 StirCycle
 3 Compressoro󰀨
 4 “StandbyMode”
5 “Sleep 1 Mode”
6 “Sleep 2 Mode”
 7 “CleanMode”
8 Startup
 9 Storageonlyrefrigeration
 10 Freezingcycleisshutdown
 11 Doorsafetyswitchtriggered
12 High pressure cutout
Up Time (hours)
This value is a record of the total time the freezer
has been in service. If power is interrupted, the
timer will stop until power is restored. This timer
does not reset.

Operators Manual #513630 9 U412/SU412 Models
RUN STATISTICS
 In addition to dynamic readings and recorded
error code details, the IntelliTec™ control records
rolling averages of run statistics. Following are the
readingsavailableundertheRUNSTATSmenu:
On Times (sec)
The control records the time of each freezing
cycleandprovidesarollingaverage.
O󰀨Times(sec)
The control records the time between freezing
cyclesandprovidesarollingaverage.
Brl. Min (°F)
The lowest average barrel temperature is
recorded.
Brl. Max (°F)
The highest average barrel temperature is
recorded.
Stor Min (°F)
The lowest average cabinet temperature is
recorded.
Stor Max (°F)
The highest average cabinet temperature is
recorded.
Power On (hrs)
This value is a record of the time the freezer has
been in service. If power is interrupted, the timer
will reset.
2.6 ADJUSTMENTS(SERVICEPERSONNEL
ONLY)
Thefollowingadjustmentsdirectlya󰀨ectproductconsis-
tencyand lengthof time in “Serve Mode”.The default
settings have been created using a 5% milkfat soft serve
mixandprovideoptimalproductconsistencywhilepro-
longing product life.
CutOut (amps)
 It is recommended to set the CutOut value at
initial startup and when changing mix types.
Adjustments to this setting directly a󰀨ect the
lengthofthefreezingcyclewhichchangesproduct
consistency.Toproperly set theCutOut value,
refertosection3-10.
Cut In T (°F)
 Aftertheconsistencyvaluehasbeendetermined,
theCutInTvaluecanbeadjusted.TheCutIn
T is the temperature of the refrigerant gas in the
evaporatoratthefrontofthefreezingcylinder.
Changingthissettingchangesthetemperatureat
whichthefreezingcyclestarts.Thisvaluealong
withtheCutOutvaluedeterminestherangeof
temperatures(or“temperature window”) ofthe
product. Decreasing the temperature decreases
the temperature window and, under normal use,
increases the amount of freezing cycles. This
creates a greater chance of product breakdown
bystirringtheproductoften.IncreasingtheCut
In T increases the temperature window, which
decreases freezing cycles and increases the
chance of heat shock within the product.
Cycles (count)
This setting determines the number of freezing
cyclesduring“ServeMode”.Increasingthevalue
willincreasethetotaltimein“ServeMode”.Factory
defaultis20cycles,whichresultsin“ServeMode”
lastingabout2-1/2hourswithoutthePUSHTO
FREEZEbuttonbeingpressedoraspigothandle
beingpulled.IfthePUSHTOFREEZEbuttonis
pressedorthespigothandleispulledatanytime
during“ServeMode”,theCyclescountwillreset.
2.7 OTHER SETTINGS (SERVICE
PERSONNEL ONLY)
Changingany setting on the IntelliTeccontrol will alter
freezer operation and a󰀨ect the product temperature,
consistency,orlife.RefertotheIntelliTecControlSystem
Settings sheet located in the information pouch behind
theheaderpanel of the freezer. Ifanyofthefollowing
settingsontheIntelliTeccontroldi󰀨erfromtheSystem
Settings sheet, it is recommended to return those settings
tofactorydefaults.
Stir On (sec)
 Adjustmentstothissettinga󰀨ecttheamountof
timetheaugerrotatesinthestircycle.Thestir
cycleoccursin“ServeMode”,“StandbyMode”,
and “Sleep 2 Mode”.
StirO󰀨(sec)
 Adjustmentstothissettinga󰀨ectthetimebetween
stircycles.Thestircycleoccursin“ServeMode”,
“StandbyMode”,and“Sleep2Mode”.
On Time (sec)
Increasing this value will increase the length of
thefreezingcycleduring“StandbyMode”.

Operators Manual #513630 10 U412/SU412 Models
O󰀨Time(sec)
Increasing this value will increase the time between
freezingcyclesin“StandbyMode”andresultin
an increase of product temperature in the barrel.
Stb Time (sec)
This setting determines the total amount of time
in“StandbyMode”.
Sl1DrvOn (sec)
 Adjustmentstothissettinga󰀨ecttheamountof
timetheaugerrotatesinthestircycle.Thisstir
cycleonlyoccursin“Sleep1Mode”.
Sl1DrO󰀨(sec)
 Adjustmentstothissettinga󰀨ectthetimebetween
stircycles.Thestircycleonlyoccursin“Sleep1
Mode”.
Sl2CutIn (°F)
 Changingthissettinga󰀨ectsthetemperatureat
whichthefreezingcyclestartsin“Sleep2Mode”.
Sl2CtOut (°F)
 Changingthissettinga󰀨ectsthetemperatureat
whichthefreezingcyclestopsin“Sleep2Mode”.
DftO󰀨Tm(sec)
In “Serve Mode”, this value determines the
maximum time without a freezing cycle. If this
valueismet,afreezingcyclewillstart.Intheevent
ofafreezingcylindertemperaturesensorfailure,
this value a󰀨ects the amount of time between
freezingcyclesduring“ServeMode”.
Refriger
This setting changes how the control handles
the storage refrigeration cycle. The setting for
theSU412isCabinet.
CabCutIn (°F)
 IfRefrigervalueissettoCabinet,thisdetermines
thetemperatureatwhichtherefrigerationcycle
starts. If None, 1 Hopper, or 2 Hopper is selected
fortheRefrigersetting,CabCutInwillnotbeshown
on the IntelliTec™ menu.
CabCtOut (°F)
 IfRefrigervalueissettoCabinet,thisdetermines
thetemperatureatwhichtherefrigerationcycle
stops. If None, 1 Hopper, or 2 Hopper is selected
for the Refriger setting, CabCtOut will not be
shown on the IntelliTec menu.
CabO󰀨
 If the Refriger value is set to Cabinet and the
temperature sensor in the cabinet fails, this setting
determinesthetimebetweenrefrigerationcycles.
If None, 1 Hopper, or 2 Hopper is selected for the
Refrigersetting,CabO󰀨willnotbeshownonthe
IntelliTec menu.
Cab On
 If the Refriger value is set to Cabinet and the
temperature sensor in the cabinet fails, this setting
determinesthelengthoftherefrigerationcycle.If
None, 1 Hopper, or 2 Hopper is selected for the
Refrigersetting,CabOnwillnotbeshownonthe
IntelliTec menu.
2.8 OVERRUN ADJUSTMENT
The product, when served, is a combination of air and
mix. Overrun is a measure of the amount of air blended
into the mix.
Overrun can be expressed in terms of the amount of
weight loss for a given volume. For example, if a pint of
liquidmixweighs18ouncesandapintoffrozenproduct
with air added weighs 12 ounces, the overrun is said to
be50percent:18oz.-12oz.=6oz.,(6/12)x100=50%
Theoverruncanbecheckedbyplacingaonepintcon-
tainer on an ice cream scale and zeroing out the scale.
Thenll aone pint container with frozen product. The
containershouldbelledoverthetopandleveledwith
astraightedge.Theproductshouldnotcontainanyair
pockets. When weighed on an ice cream scale, one pint
of product should weigh 12 to 13 ounces.
Themixpumphasbeenpresetatthefactorytoproduce
aproductwithapproximately40%overrun.Becauseof
di󰀨erencesinmix formulation, temperatures and baro-
metricpressure,thisguremayvary.Itwillbenecessary
forapproximately2gallonsofmixtobepumpedthrough
the freezer before overrun changes in the product are
noticeable.
Overruniscontrolledbythelengthoftheaircompressor
pistonstrokewithinthepistoncylinder.Lengtheningthe
strokewithinthecylinderwillincreaseoverrun.Conversely,
shortening the stroke will decrease overrun. To perform
an overrun adjustment, refer to the following procedure:
WARNING
Hazardous voltage
The Main Freezer Power switch must be placed in
the OFF position when disassembling for servicing.
The freezer must be disconnected from electrical
supplybeforeremovinganyaccesspanel.Failure
to disconnect power before servicing could result
indeathorseriousinjury.

Operators Manual #513630 11 U412/SU412 Models
A. Turn the mix pump switch to the OFF position.
Disconnectpowersources/circuitbreakers.
B. Remove the back panel from the freezer.
C. Ontheaircompressorsideofthepump,locate
thelong/slenderpistonrockingarm.Therocking
armdownward travel is limitedbya stationery
cam. On the face of the cam there is an overrun
setting indicator plate numbered 3 through 8 and
anadjustmentknob(Fig.2-2).
D. Theoverrunsettingisindicatedbyapin.
E. Toadjustoverrun,loosentheallen-headscrew
(locatedwithinthecenteroftheadjustmentknob)
withthe5/32”allenwrenchprovided.Rotatethe
adjustment knob counterclockwise to a higher
number for higher overrun, or clockwise to a lower
number for lower overrun. Each number multiplied
by 10 represents the overrun percentage (i.e.
setting4=40%overrun).
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.
2.9 MIX PUMP HOSE REPOSITION
Mixpumphosemustberepositionedevery800gallons
ofmixpumpedorevery 2weeks.Failuretoreposition
thehosewillresultinreducedmixpumpliquidcapacity,
dispense stoppage, popping, and possible mix pump hose
leakage. Follow the steps below to reposition the hose:
A. Run cleaning solution through pump.
B. Turnthepumpo󰀨andrelieveanypressureby
opening the spigot.
C. Graspthepickuphoseendofthemixpumphose
with one hand and turn the pump on. Pull down
on the pickup hose end until 12 to 14 inches of
tubing has fed through the pump then turn the
pumpo󰀨(Fig.2-3).
D. Loosen the small clamp at the pick-up hose
adapter and disconnect the mix pump hose.
E. Cut 7-1/2 inches o󰀨 the end of the mix pump
hose.
F. Reconnect the mix pump hose to the adapter.
G. Continue normal operation. Mix hose will
automatically reposition itself with the adapter
near the black cover.
NOTE
Each hose is long enough for 3 repositions before
replacement is required.
2.10 MIX PUMP HOSE REPLACEMENT
Mix pump hose must be replaced when tubing cannot be
furtherrepositioned(everyfourtoeightweeks).Failure
tocomplywillresultinhosefailureandpossiblepump
damage. Follow the steps below to replace the hose:
A. Run cleaning solution through pump.
B. Turnthepumpo󰀨andrelieveanypressureby
opening the spigot.
C. Disconnectthemixpumphoseateachend.
D. 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.
Turnpumpo󰀨.
E. Rotatepumprollerassemblysoonerollerisat
the 6:00 position.
F. Useabrushthattsintheopeningandcleanthe
pumprollerassembly,rstwithdetergentwater
and then clear water.
Figure 2-2 Overrun Adjustment
Overrun
Adjustment
Knob
Figure 2-3 Pump Hose Reposition
12” to 14”
Pickup
End

Operators Manual #513630 12 U412/SU412 Models
G. Connectthenewmixpumphosetothepickup
hose adapter using the small clamp.
H. Feed one end of the mix pump hose into the
pickuphoseside(left)oftheblackcover.
NOTE
Feed the tube into the clamp so the natural curve of
the tube is towards the outside of the black cover.
This prevents the hose from looping around the
black cover twice.
I. Gentlypushthehoseintotheblackcoveruntilit
begins to feed.
J. Allow the hose to feed itself through the pump
until about 6” (15cm) remains on the entering
side.
K. Turnpumpo󰀨.
L. Connectthemixpumphosetotheelbowtting
(locatedontheleftsideofthemixlinemanifold)
using a small hose clamp. Be careful not to twist
the mix hose.
M. Turn the pump on.
N. Allowtheremaining6”(15cm)oftubingtofeed
through the pump until the hose adapter prevents
further feeding.
O. Turnthepumpo󰀨.
CAUTION
Risk of Product Damage
Air/Mix Tee must remain below the black cover
clamp.IftheTeeisabovethepump,themixmay
drain into the air compressor, resulting in pump
damage.
P. Connectthefreeendofthemixpumphosetothe
3-wayTee.Whenallconnectionsarecomplete,
the3-wayTeemustbelowerthantheblackpump
housing.
Q. Thepumpisnowreadytosanitize.
2.11 CAB TEMPERATURE ADJUSTMENT
Cabtemperatureismonitoredandcontrolledbytwoset-
tingsontheIntelliTec™control:CabCutInandCabCtOut.
The cut in value determines the temperature at which the
refrigerationcyclestarts.Thecutoutsettingdetermines
whenthecyclestops.TochangetheCabCutInorCabC-
tOut, follow the steps below:
A. Press and hold SEL button for 8 seconds. While
still holding the SEL button, press the up arrow
button(⇑).TheLCDScreenwillread"Display".
B. Release both buttons.
C. Presstheleftarrowbutton(⇐)three(3)timesto
navigate to the Storage menu.
D. Presstheuparrowbutton(⇑)oncetonavigate
totheCabCutInvalue.Recordthisvalue.
IMPORTANT
Before making changes to any settings, record
the original values. If the setting changes do not
achieve desired results, return settings to their
original values.
E. Press SET button to enter edit mode.
F. Press the up arrow button (⇑) to increase the
numbertothevaluerequired.Thevalueincreases
by1eachtimetheuparrowbutton(⇑)ispressed.
After the value reaches 9, numbering restarts at
0.
G. Press SET button to save the setting and exit the
edit mode.
H. Presstheuparrowbutton(⇑)oncetonavigate
totheCabCtOutvalue.Recordthisvalue.
I. Press SET button to enter edit mode.
J. Press the up arrow button (⇑) to increase the
numbertothevaluerequired.Thevalueincreases
by1eachtimetheuparrowbutton(⇑)ispressed.
After the value reaches 9, numbering restarts at
0.
K. Press SET button to save the setting and exit the
edit mode.
L. Presstheuparrow(⇑)andleftarrow(⇐)buttons
to navigate to ExitMenu.
M. Presstheuparrowbutton(⇑)fromExitMenuto
return to the Mode Screen.
N. LocatetheSpecicationSheetforSU412Control
behind the header panel and record the new
values on this sheet.
2.12 DRIVE BELT TENSION ADJUSTMENT
To check belt tension, follow the steps below:
A. Remove a side panel and the back panel.
B. UseaBurroughsBeltTensionGaugetosetthe
tension for the drive belt. Set the belt tension to
15-25lbs.
WARNING
Hazardous voltage
The Main Freezer Power switch must be placed in
the OFF position when disassembling for servicing.
The freezer must be disconnected from electrical
supplybeforeremovinganyaccesspanel.Failure
to disconnect power before servicing could result
indeathorseriousinjury.

Operators Manual #513630 13 U412/SU412 Models
C. If an adjustment is necessary, loosen the four
motor plate retaining nuts, adjust belt tension
then retighten the four nuts.
D. Usingastraightedge,checkthatthedrivemotor
pulleyisalignedwiththespeedreducerpulley.
Alignthepulleyifnecessary.
NOTE
Belt life will be increased if new drive belts are
tightened after two or three weeks of operation.
2.13 CONDENSER CLEANING (AIR-COOLED
FREEZERS)
Thecondenserrequiresperiodiccleaning.Tocleanthe
condenser, refer to the following steps:
A. Liftthecondenserltero󰀨ofthefreezercover
panel.Visuallyinspectthecondenserlterfordirt
(Fig.2-4).
B. Ifthecondenserlterisdirty,vacuumorbrush
it clean. Rinse it with clean water and allow it to
drybeforereplacingitonthefreezer.
NOTE
If the condenser is not kept clean, refrigeration ef-
ciency will be lost.
2.14 PREVENTIVE MAINTENANCE
It is recommended that a preventative maintenance
schedule be followed to keep the freezer clean and op-
eratingproperly.Thefollowingstepsaresuggestedasa
preventative maintenance guide.
TheUnitedStatesDepartmentofAgricultureandtheFood
andDrugAdministrationrequirethatlubricantsusedin
foodzonesbecertiedforthisuse.Uselubricantsonlyin
accordance with the manufacturer’s instructions.
A. Dailychecks
 Check for any unusual noise or condition and
repairimmediately.
B. Monthlychecks
 1.Checkdrivebeltsforwearandtightenbeltsif
necessary.(Refertosection2.12.)
 2.Checkthecondenserlterfordirt.(Referto
section2.13.)
2.15 EXTENDED STORAGE
Refer to the following steps for winterizing the freezer or
forstoringthefreezeroveranylongperiod.
A. Cleanallofthepartsthatcomeincontactwith
mixthoroughly with warm detergent.Rinse in
clearwateranddryallparts.Donotsanitize.
NOTE
Do not let cleaning solution stand in freezer barrel
or mix pump during the shutdown period.
B. Remove, disassemble, and clean the front door,
auger shaft, and mix pump. Leave disassembled
during the shutdown period.
C. Placetheplasticscraperbladeinaplasticbag
with a moist paper towel. This will prevent the
ightsfrombecomingbrittleifexposedtodryair
overanextendedperiod(over30days).
D. Forwater-cooledfreezersthatareleftinunheated
buildings, or buildings subject to freezing, the water
mustbeshuto󰀨anddisconnected.Disconnect
thettingsatthewaterinletandthewateroutlet
linesofthefreezer.Thettingsarelocatedatthe
rearofthefreezer.Runthecompressorfor2-3
minutes to open the water valve. Blow out all the
water,rstthroughthewaterinlet,thenthrough
the water outlet lines with air or carbon dioxide.
Drainthewatersupplylinecomingtothefreezer.
E. PlacethePump OFF/ON switchandthe Main
Freezer Power OFF/ON switch in the OFF
position.
F. Disconnect the freezer from the source of the
electricalsupplyinthebuilding.
Figure 2-4 Removing Condenser Filter

Operators Manual #513630 14 U412/SU412 Models

Operators Manual #513630 15 U412/SU412 Models
SECTION 3
REFRIGERATION SYSTEM
3.1 REFRIGERATION SYSTEM
TheU412/SU412refrigerationsystemhastwofunctions:
 Medium-Temperature - Maintaining product
temperature in the cab unit and providing
refrigeration to the mix transfer line.
 Low-Temperature - Producing and maintaining
highqualityshakeinthefreezingcylinder.
Thesystemisdesignedfore󰀩cientusewithR-448Aor
R-404Arefrigerant.Refertothemachine’snameplate
toconrmrefrigerant.
The proper charge is indicated on the information plate.
3.2 REFRIGERANT RECOVERY &
EVACUATION
Refertothefollowingprocedurestoproperlyrecoverand
evacuatetherefrigerationsystem.Donotpurgerefriger-
ant into the atmosphere.
NOTE
For qualied service personnel only. Anybody work-
ing with refrigerants must be certied as a Techni-
cian TYPE I as required by 40 CFR 82 Subpart F
and hold all State and/or local refrigerant handling
certications. In addition, all handling, storage, and
disposal of refrigerants must be in accordance with
Environmental Protection Agency (EPA) guidelines
and standards and all State and local guidelines
and standards.
WARNING
Hazardous voltage
The Main Freezer Power switch must be placed in
the OFF position when disassembling for servicing.
The machine must be disconnected from electrical
supplybeforeremovinganyaccesspanel.Failure
to disconnect power before servicing could result
indeathorseriousinjury.
TXV
TXV Bulb
Freezing Cylinder
Evaporator
Suction Line
Solenoid
Check Valve
Liquid Line
Solenoid
Access
Fitting
(low side)
Thermistor
Probe
Scroll Compressor
Condensate Pan
High Pressure
Cutout
(445 psig cutout
350 psig cutin)
Hot Gas
Bypass
(18 psig)
Filter Drier
Water Cooled
Condenser
Sight
Glass
Liquid Line
Solenoid TXV
Cab Evaporator
Check Valve
EPR (76-78 psig)
Mix Line Tube
Access
Fitting
(high side)
Heat
Exchange
Capillary
Tube
Access
Fitting
(low side)
Access
Fitting
(low side)
TXV Bulb
Figure 3-1 Water Cooler Refrigeration System