Vollrath Stoelting SU444 User manual

Model SU444 / U444A
SERVICE MANUAL
Manual No. 513640 Rev.1

This manual provides basic information about the machine. Instructions and suggestions are
given covering its operation and care.
The illustrations and specifications are not binding in detail. We reserve the right to make
changes to the machine without notice, and without incurring any obligation to modify or pro-
vide new parts for machines built prior to date of change.
DO NOTATTEMPT to operate the machine until instructions and safety precautions in this
manual are read completely and are thoroughly understood. If problems develop or questions
arise in connection with installation, operation, or servicing of the machine, contact Stoelting.
Stoelting Foodservice Equipment
502 Highway 67
Kiel, WI 53042-1600
U.S.A.
Main Tel: [phone]
Fax: [phone]
Customer Service: 888.429.5920
Fax: [phone]
Email: [email protected]
© 2014 PW Stoelting, LLC
stoeltingfoodservice.com

Safety Alert Symbol:
This symbol Indicates danger, warning or caution.
Attention is required in order to avoid serious per-
sonal 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 degree of a hazard.
CAUTION
The signal word “CAUTION” indicates a potentially
hazardous situation, which, if not avoided, may result
in minor or moderate injury and equipment/property
damage.
A Few Words About Safety
Safety Information
Read and understand the entire manual before
operating or maintaining Stoelting equipment.
This manual provides the operator with information
for the safe operation and maintenance of Stoelting
equipment. As with any machine, there are hazards
associated with their operation. For this reason safety
is emphasized throughout the manual. To highlight
specific safety information, the following safety defini-
tions are provided to assist the reader.
The purpose of safety symbols is to attract your at-
tention to possible dangers. The safety symbols, and
their explanations, deserve your careful attention
and understanding. The safety warnings do not by
themselves eliminate any danger. The instructions
or warnings they give are not substitutes for proper
accident prevention measures.
If you need to replace a part, use genuine Stoelting
parts with the correct part number or an equivalent
part. We strongly recommend that you do not use
replacement parts of inferior quality.
WARNING
The signal word “WARNING” indicates a potentially
hazardous situation, which, if not avoided, may result
in death or serious injury and equipment/property
damage.
CAUTION
The signal word “CAUTION” not preceded by the
safety alert symbol indicates a potentially hazardous
situation, which, if not avoided, may result in equip-
ment/property damage.
NOTE (or NOTICE)
The signal word “NOTICE” indicates information or
procedures that relate directly or indirectly to the
safety of personnel or equipment/property.

TABLE OF
CONTENTS
Section Description Page
1 Introduction
1.1 Description.................................................................................................. 1
1.2 Specifications ............................................................................................. 2
1.3 Right Side Control Operation...................................................................... 3
A. Initial Status..........................................................................................................3
B. Serve Mode..........................................................................................................3
C. Standby Mode......................................................................................................3
D. Sleep 1 Mode.......................................................................................................4
E. Sleep 2 Mode.......................................................................................................4
F. IntelliTec Restart...................................................................................................4
G. Sleep 3 Mode.......................................................................................................4
H. Clean Mode..........................................................................................................5
1.4 Mix Level Indicators....................................................................................5
1.5 Storage Refrigeration ................................................................................. 5
1.6 Operation During Sensor Failure................................................................ 5
A. Serve and Standby Mode.....................................................................................5
B. Cabinet Refrigeration ...........................................................................................5
1.7 Motor Profile Cutout Compensation ........................................................... 5
1.8 Left Side Control Operation........................................................................ 6
A. Initial Status..........................................................................................................6
B. Standby Mode......................................................................................................6
C. Serve Mode..........................................................................................................6
D. Clean....................................................................................................................6
2 Installation Instructions
2.1 Safety Precautions ..................................................................................... 9
2.2 Shipment and Transit.................................................................................. 9
2.3 Machine Installation.................................................................................... 9
2.4 Installing Wiring .......................................................................................... 9
2.5 Check Compressor for Proper Power (3 Phase Only)................................ 10
2.6 Check Blender Rotation.............................................................................. 10
2.7 Mix Pump.................................................................................................... 10
A. Mix Pump Hose Installation..................................................................................10
B. Mix Pickup Hose Installation ................................................................................11
C. Mix Low Level Indicator Adjustment.....................................................................12

Section Description Page
3 Initial Set-Up and Operation
3.1 Operator’s Safety Precautions.................................................................... 13
3.2 Operating Controls and Indicators.............................................................. 13
3.3 Important Information Regarding Cleaning and Sanitizing......................... 14
3.4 Disassembly of Left Side............................................................................ 16
3.5 Disassembly of Right Side.......................................................................... 17
3.6 Cleaning Disassembled Parts .................................................................... 18
3.7 Sanitizing Parts........................................................................................... 18
3.8 Cleaning the Machine................................................................................. 18
3.9 Assembling the Left Side............................................................................ 18
3.10 Assembling the Right Side ......................................................................... 19
3.11 Sanitizing .................................................................................................... 20
3.12 Initial Freeze Down and Operation............................................................. 21
3.13 Normal Freeze Down And Operation.......................................................... 22
3.14 Mix Information ........................................................................................... 23
3.15 Operation of Mix Pump...............................................................................23
3.16 Mix Pump Cleaning .................................................................................... 23
3.17 Disassembly and Inspection of Removable Parts ...................................... 24
4 Maintenance and Adjustments
4.1 Machine Adjustment ................................................................................... 25
4.2 Product Temperature Adjustment (Left Side).............................................. 25
4.3 Product Consistency Adjustment (Right Side)............................................ 25
4.4 Locking the Control Panel (Right Side) ...................................................... 25
4.5 Obtaining Readings and Modifying Settings
(Service Personnel Only) (Right Side)........................................................ 25
4.6 Readings (Service Personnel Only) (Right Side) ....................................... 26
4.7 Adjustments (Service Personnel Only) (Right Side)................................... 27
4.8 Other Settings (Service Personnel Only) (Right Side)................................ 28
4.9 Overrun Adjustment.................................................................................... 28
4.10 Mix Pump Hose Reposition ........................................................................ 29
4.11 Mix Pump Hose Replacement.................................................................... 30
4.12 Cab Temperature Adjustment ..................................................................... 30
4.13 Drive Belt Tension Adjustment.................................................................... 31
4.14 Condenser Cleaning (Air- Cooled Machines)............................................. 31
4.15 Preventative Maintenance .......................................................................... 31
4.16 Extended Storage....................................................................................... 32

Section Description Page
5 Refrigeration System
5.1 Refrigeration System .................................................................................. 33
5.2 Refrigerant Recovery And Evacuation........................................................ 33
A. Refrigerant Recovery ...........................................................................................34
B. Evacuating the Refrigeration System...................................................................34
5.3 Refrigerant Charging .................................................................................. 34
5.4 Compressor ................................................................................................ 35
5.5 Condenser .................................................................................................. 36
5.6 Evaporator .................................................................................................. 36
5.7 Valves ......................................................................................................... 37
A. Thermostatic Expansion Valve (TXV) ..................................................................37
B. Check Valve .........................................................................................................38
C. High Pressure Cutout...........................................................................................38
D. Water Valve (Water Cooled Models Only)............................................................38
5.8 Solenoid...................................................................................................... 39
5.9 Filter Drier................................................................................................... 40
5.10 Capillary Tube............................................................................................. 41
5.11 Cab Unit...................................................................................................... 41
6 Electrical and Mechanical Control Systems
6.1 Controls ...................................................................................................... 43
A. IntelliTec Control...................................................................................................43
B. Challenger Control ...............................................................................................43
6.2 Contactors .................................................................................................. 43
6.3 Drive Motor ................................................................................................. 44
6.4 Capacitors .................................................................................................. 45
6.5 Gearbox...................................................................................................... 45
6.6 Condenser Fan Motor (Air- Cooled Only)...................................................46
6.7 Cab Condenser Fan Motor......................................................................... 47
6.8 Switches ..................................................................................................... 47
A. Spigot Switch .......................................................................................................47
B. Blender Activation Switch (Shake) .......................................................................48
C. Pump Pressure Switch.........................................................................................48
D. Cab Door Magnetic Reed Switch.........................................................................48
6.9 Temperature Control Sensor ......................................................................49

Section Description Page
7 Troubleshooting
7.1 Error Codes (Right Side) ............................................................................ 51
7.2 Troubleshooting - Error Codes (Right Side) ...............................................51
7.3 Troubleshooting - Freezer ..........................................................................53
7.4 Troubleshooting - Mix Pump....................................................................... 54
8 Replacement Parts
8.1 Brushes, Decals and Lubrication................................................................ 57
8.2 Accessories ................................................................................................ 58
8.3 Kits.............................................................................................................. 58
8.4 Panels and Screws.....................................................................................58
8.5 Left Side Auger Shaft and Front Door Parts ............................................... 59
8.6 Right Side Auger Shaft and Front Door Parts.............................................60
8.7 Blender Parts and Drip Tray ....................................................................... 61
8.8 Machine Front............................................................................................. 62
8.9 Spigot Assemblies ...................................................................................... 63
8.10 Cab Interior................................................................................................. 64
8.11 Cab Tubing ................................................................................................. 65
8.12 Pump Parts................................................................................................. 66
8.13 Header Panel - Electrical............................................................................68
8.14 Right Side ................................................................................................... 69
8.15 Rear............................................................................................................ 70
8.16 Left Side and Cabinet Refrigeration System .............................................. 72
8.17 Wiring Diagrams ......................................................................................... 73

1
1.1 DESCRIPTION
The Stoelting SU444 and U444A floor model machines
are pressure fed. They are equipped with fully automatic
controls to provide a uniform product. The SU444 and
U444A are designed to dispense soft serve product from
the left side and shake product from the right side. The
SU444 has a blender attached to the front door of the
shake side.
This manual is designed to assist qualified service per-
sonnel and operators with installation, operation and
maintenance of the SU444 and U444A.
SECTION 1
DESCRIPTION AND SPECIFICATIONS
Figure 1-2 Dimensions
Figure 1-1 Model SU444 Machine

2
1.2 SPECIFICATIONS
* CutOut value needs to be adjusted to product
requirements
SU444 Water Cooled SU444 Air Cooled
Dimensions Machine with crate Machine with crate
width 26-7/8’’ (68,3 cm) 34’’ (86,4 cm) 26-7/8’’ (68,3 cm) 34’’ (86,4 cm)
height 67-3/8’’ (171,1 cm) 78’’ (198,1 cm) 67-3/8’’ (171,1 cm) 78’’ (198,1 cm)
depth 40’’ (101,6 cm) 48’’ (121,9 cm) 40’’ (101,6 cm) 48’’ (121,9 cm)
Weight 760 lbs (344,7 kg) 908 lbs (411,8 kg) 760 lbs (344,7 kg) 908 lbs (411,8 kg)
Electrical 1 PH 3 PH 1 PH 3 PH
left right left right left right left right
minimum circuit
ampacity 31A 26A 19A 18A 32A 26A 20A 18A
maximum overcurrent
protection device 50A 40A 30A 25A 50A 40A 30A 25A
Compressor Soft Serve - 19,000 Btu/hr Scroll™ Compressor (R-404A) Shake - 15,000 Btu/hr Scroll™ Compressor (R-404A)
Cabinet - 1,300 Btu/hr Compressor (R-134a)
Drive Motor Soft Serve - 2 hp, Shake - 3/4 hp
Cooling
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. The machine requires 6”
(15,2 cm) air space on all sides for the
cabinet refrigeration system.
Air cooled units require 6” (15,2 cm) air
space on both sides and back.
Hopper Volume Two - 8 gallon (30,28 liters)
Freezing Cylinder
Volume Soft Serve - 1.33 gallon (5,4 liters) Shake - 2.1 gallon (7,95 liters)
Menu Display Value
Basic CutOut * amps
Cut In T 28.5 °F
Cycles 20 count
Stir On 15 seconds
Stir Off 300 seconds
Advanced On Time 28 seconds
Off Time 450 seconds
Stb Time 120 minutes
Sl1DrvOn 120 seconds
Sl1DrOff 180 seconds
Sl2CutIn 37 °F
Sl2CtOut 31 °F
DftOffTm 900 seconds
Storage Refriger Cabinet
CabCutIn 38 °F
CabCtOut 34 °F
Cab Off 13 minutes
Cab On 130 seconds
SU444
Refrigerant R-404A
Charge Left Side - 46 oz
Right Side - 46 oz
Suction Pressure Soft Serve - 23-24 psig
Shake - 28-30 psig
Discharge Pressure
at 80ºF Ambient
Soft Serve - 235-240 psig
Shake - 235-240 psig
Cabinet
Refrigerant R-134A
Charge 8 oz
Cab Suction
Pressure 18 psig

3
1.3 RIGHT SIDE CONTROL OPERATION
Following are details of the operational modes on the right
side of the SU444 and U444A.
NOTE:
The preset amounts, times, and temperatures
listed below are references to 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.
WhenthePUSHTO FREEZE button ispressedthecontrol
will move to the “Serve Mode”.
B. SERVE MODE
Whenthe PUSHTOFREEZEbuttonispressed or a spigot
handleis 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 off. After a 3 second delay, the drive
motor turns off.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 Off).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 (DftOffTime). 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 Off
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 Off) and
prevents product separation.
Figure 1-3 Serve Mode
Figure 1-4 Standby Mode

4
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 dependant 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 andSl1DrOff), and allows product
to melt to a liquid state by using agitation cycles without
any flow 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).Whenthistemperaturehasbeen 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 moveto “Serve Mode”. If the spigot
is opened in “Sleep 1 Mode”, the product will not be at
consistency. The operator must wait until the first “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 Off) 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 first “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 41°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

5
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 Off/On switch in the OFF 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 flash. To clear the “Low Mix” error, add
mix to the cabinet’s mix container.
1.5 STORAGE REFRIGERATION
The IntelliTec control is programmedto handle refrigeration
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 Off light on the front of the machine will
flash.
If the cabinet door is opened during a refrigeration
cycle, the evaporator fan will continue to run but
the refrigeration cycle willbe 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
cycle or cabinet refrigeration. This allows the operator to
continue to serve product from the machine until proper
servicing can be completed.
Figure 1-7 Serve Mode (Sensor Failure)
A. SERVE AND 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 another
freezing cycle until a preset value (DftOffTm) 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 Off). 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
specific temperature and consistency irrespective of the
supply voltage. A motor profile curve is programmed on
the IntelliTec control and provides a relationship between
the supply voltage and drive motor cutout amperage. De-
pending on the supply voltage, the control varies cutout
amperage according to the motor profile. This feature is
automatic and does not need any configuring.

6
Table 1-1 IntelliTec Control Settings
IntellITec Control Setting Specifications
Basic Menu DISPLAY Value MODE DEFINITION
CutOut * Serve Amp draw setting for cut out
Cut In T 28.5°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 Off 300 sec Serve Stir-only off time
Advanced Menu DISPLAY Value MODE DEFINITION
On Time 28 sec Standby Freezing cycle “on” time (runs on timers only)
Off Time 450 sec Standby Freezing cycle “off” time
Stb Time 120 sec Standby Total time in mode
Sl1DrvOn 120 sec Sleep 1 Drive motor “on” timer
Sl1DrOff 180 sec Sleep 1 Drive motor “off” timer
Sl2CutIn 37°F Sleep 2 Cut in temperature
Sl2CtOut 31°F Sleep 2 Cut out temperature
DftOffTm 900 sec No Sensor Default “off” 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 Off 13 min No Sensor Default “off” 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 2187695 - Specification Sheet for SU444
Control located in the plastic pouch behind the header panel.

7
1.8 LEFT SIDE CONTROL OPERATION
The soft serve side is run by a temperature control. Fol-
lowing are details of the operational modes on the left
side of the SU444 and U444A.
A. INITIAL STATUS
When the Clean/Off/Serve switch is in the Off position
and the freezer is powered, the red LED on the control
board will be lit. The red LED will remain lit whenever the
board is powered.
The refrigeration and drive motor will not cycle in the Off
position.
B. STANDBY MODE
When Clean/Off/Serve switch is placed in the Serve
position and the Standby/Serve switch is in the Standby
position, the machine is in Standby mode.
During Standby mode, the HI relay monitors the resis-
tance of the freezing cylinder sensor. When the sensor
resistance is below the HI relay cutin, a freezing cycle
begins. On the control board, the yellow LED will light.
The drive motor starts, and after a 3 second delay, the
compressor starts. When the temperature in the freezing
cylinder reaches the HI relay cutout, the compressor turns
off. After a 3 second delay, the drive motor turns off. The
yellow LED will turn off.
During standby, product in the freezing cylinder will be
safely kept below 41°F. The product is not kept in a serv-
able state.
C. SERVE MODE
When Clean/Off/Serve switch is in the Serve position and
the Standby/Serve switch is placed in the Serve position,
the machine is in Serve mode.
During Serve mode, the LO relay monitors the resistance
of the freezingcylinder sensor. When the sensorresistance
is below the LO relay cutin, a freezing cycle begins. On
the control board, the green LED will light. The drive motor
starts, and after a 3 second delay, the compressor starts.
NOTE
Ifthesensorresistance is below the HI relay cutout,
the yellow LED will also light. The yellow LED will
remainlituntil the sensor resistance reachesthe HI
relay cutout. The freezing cycle will continue until
the LO relay cutout is met.
When the temperature in the freezing cylinder reaches
the LO relay cutout, the compressor turns off. After a 3
second delay, the drive motor turns off and the green
LED turns off.
If the freezing switch is placed in the MAXIMUM position,
the machine is forced to run 30 seconds after the LO relay
cutout is satisfied.
D. CLEAN
When the Clean/Off/Serve switch is placed in the Clean
position, refrigeration stops, the drive motor starts and
will run for 20 minutes.
If the machine is left in Clean mode for 20 minutes, the
drive motor will stop to prevent damage to the machine.
Temperature
Time
HI Relay Sensor
Cut In
HI Relay Sensor
Cut Out
Freezing Cycle
Figure 1-8 Standby Mode
Temperature
Time
LO Relay Sensor
Cut In
LO Relay Sensor
Cut Out
Freezing Cycle
Figure 1-9Serve Mode

8

9
SECTION 2
INSTALLATION INSTRUCTIONS
2.1 SAFETY PRECAUTIONS
Do not attempt to operate the machine 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 machine. The la-
bels have been put there to help maintain a safe working
environment. The labels have been designed to withstand
washing and cleaning. All labels must remain legible for
the life of the machine. Labels should be checked periodi-
cally to be sure they can be recognized as warning labels.
If danger, warning or caution labels are needed, indicate
the part number, type of label,location of label, and quantity
required along with your address and mail to:
STOELTING
ATTENTION: Customer Service
502 Hwy. 67
Kiel, Wisconsin 53042
2.2 SHIPMENT AND TRANSIT
The machinehas been assembled, operatedand inspected
at the factory. Upon arrival at the final destination, the
entire machine must be checked for any damage which
may have occurred during transit.
With the method of packaging used, the machine should
arrive in excellent condition. THE CARRIER IS RESPON-
SIBLE FOR ALL DAMAGE IN TRANSIT, WHETHER
VISIBLE OR CONCEALED. Do not pay the freight bill
until the machine has been checked for damage. Have
the carrier note any visible damage on the freight bill. If
concealed damage and/or shortage is found later, advise
the carrier within 10 days and request inspection. The
customer must place a claim for damages and/or short-
ages in shipment with the carrier. Stoelting, Inc. cannot
make any claims against the carrier.
2.3 MACHINE INSTALLATION
WARNING
Installation must be completed by a qualified
electrician/refrigeration specialist.
Incorrect installation may cause personal injury,
severe damage to the machine and will void fac-
tory warranty.
Installation of the machine involves moving the machine
close to its permanent location, removing all crating, set-
ting in place, assembling parts, and cleaning.
A. Uncrate the machine.
B. Install the four casters. Turn the threaded end
into the machine until no threads are showing. To
level, turn outcasters no more than 1/4”maximum,
then tighten all jam nuts.
C. The machine must be placed in a solid level
position.
NOTE
Accurate leveling is necessary for correct drainage
of freezing cylinder and to insure correct overrun.
D. Machines with air cooled condensers require a
minimum of 6” (15,2cm) space on all sides and
back for proper circulation.
NOTE
In order for the condenser fan motor to work the
left side needs to be connected to a power source.
E. Machines that have a water cooled condenser
require 1/2” NPT supply and drain fittings.
2.4 INSTALLING WIRING
A. Refer to the nameplate on the side panel of the
machineforspecificelectrical requirements. Make
sure the power source in the building matches
the nameplate requirements. Bring the wires into
the junction boxes through the access holes in
the bottom rear of the freezer.
NOTE
Three phase freezers in areas of unbalanced elec-
tricalloads require special attentionwhen 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 back panel and the junction box
cover located at the bottom of the machine.
C. Install permanent wiring according to local code.
D. If the line voltage is less than 215V, the fan motor
needs to be rewired. Refer to the wiring diagram
for details.
NOTE
Low incoming voltage affects the fan motor speed
andcouldcausehighheadpressureerrorsfromthe
reduced air flow. Rewiring the fan motor prevents
thefanspeedfrom decreasing to an unsuitablerate.

10
2.5 CHECK COMPRESSOR FOR PROPER
POWER (3 PHASE ONLY)
After connecting the electrical, check that the compressor
is operating in the proper direction.
A. Start a freezing cycle.
On the right side, place the Main Freezer Power
switch and Freezing Cylinder OFF/ON switch to
the ON position. Press the PUSH TO FREEZE
button.
On the left side, place the Clean/Off/Serve and
theStandby/Serve switches in the Serve position.
B. The suction line will be cold to the touch within 1
minute.
C. If it is not, disconnect power to the machine and
reverse L1 and L3 lines in the junction box.
D. After reversing the electrical lines, recheck the
suction line.
2.6 CHECK BLENDER ROTATION
After connecting the electrical, check the blender on the
right side for proper rotation.
A. Place the Blender Power Off/On switch to the ON
position.
B. With the clear swing sheild in place, move the
spigot handle to the right.
WARNING
Hazardous Moving Parts
Blender shaft and agitator can grab and cause
injury. Do not operate blender without protective
shield or swing splash shield.
C. The blender should rotate clockwise looking from
the top of the blender.
D. If the rotation is counterclockwise, refer to the
wiring diagram located behind the header panel
and check the diode direction. Reverse the diode
polarity if needed.
2.7 MIX PUMP
A. MIX PUMP HOSE INSTALLATION
Follow the steps below to install the mix pump hose in
the cabinet part of the machine.
1. Turn the mix pump on. The switch is located on
the header panel.
2. Feed one end of the mix pump hose into the
entering or pickup hose side (left) of black cover
(Fig 2-2).
NOTE
Feedthetube into the clampso the naturalcurve of
the tube is towards the outside of the black cover.
This prevents the hose from looping around the
black cover twice.
3. Gently push the hose into the black cover until it
begins to feed.
Figure 2-2 Mix Hose Installation
6” (15cm)

11
4. Allow the hose to feed itself through the pump
until about 6” (15cm) remains on the entering
side.
5. Turn the pump off.
6. Connect the mix pump hose to the elbow fitting
(located on the left side of the mix line manifold)
using a small hose clamp. Be careful not to twist
the mix hose.
7. Turn the pump on.
8. Allow the remaining 6” (15cm) of tubing to feed
through pump until the hose adapter prevents
further feeding.
9. Turn the pump off.
CAUTION
Risk of Product Damage
Air/Mix Tee must remain below the black cover
clamp. If the Tee is above the pump, mix may drain
into the air compressor resulting in pump damage.
10. Connect the free end of the mix pump hose to
the 3-way Tee (Fig. 2-3). When all connections
are complete, the 3-way Tee must be lower than
the black pump housing.
B. MIX PICKUP HOSE INSTALLATION
The machine may be connected to the standard mix
container or up to three prepacked mix bags. Follow the
instructions below that match your configuration.
Standard Connection:
1. Place the mix pickup assembly through the hole
in the cover and install the retaining clip.
2. Connect a 24” (61cm) length of 3/8” (9,5mm)
ID plastic food grade tubing to the mix pickup
assembly. Secure with a hose clamp.
3. Connect the elbow fitting to the free end of the
tubing. Connect the opposite end of the elbow
to 1/4” ID tan tubing on the left side of the pump
head. Secure with hose clamps (Fig. 2-3).
WhenUsingBagConnectionSystem(BCS)withThree
Bags (optional kit):
The position of the three bags in the mix container is
important. The bag that is connected nearest the outlet
of the manifold will drain last and should be placed at
the back of the mix container. The mix low level indicator
relies on proper bag placement.
1. Connect3/8”(9,5mm)ID plastic food grade tubing
to a bag adapter. Secure with hose clamps.
Figure 2-3 Mix Pump Connections for Standard Mix Container

12
2. Slide the hose clip over free end of 3/8” (9,5mm)
ID plastic food grade tubing. Attach the free end
of the tubing to a manifold adapter. Secure with
a large hose clamp or equivalent.
3. Push the manifold adapter with spring and valve
into the left port (nearest the manifold outlet) of
the mix inlet manifold and secure with a retaining
clip.
4. Repeat steps 1 to 3 for the middle port and for
the right port of the mix inlet manifold.
5. Place three mix bags into the mix container.
6. Connect the bag adapter attached to the left side
of the manifold (closest to the mix outlet) to the
mix bag in the back of the mix container.
7. Connect the bag adapter attached to the middle
of the manifold to the mix bag in the middle of
the mix container.
8. Connect the bag adapter attached to the right
side of the manifold (farthest from the mix outlet)
to the mix bag in the front of the mix container.
When Using Bag Connection
System(BCS)withOneorTwo
Bags (optional kit):
When connecting one or two
bags, the manifold adapters
must be installed closest to the
manifold outlet and the manifold
plug(s) must be placed farthest
from the manifold outlet.
1. Connect 3/8” (9,5mm) ID
plasticfoodgradetubing
toa bag adapter. Secure
with hose clamps.
2. Slide the hose clip
over the free end of
the tubing. Attach the
free end of the tubing
to a manifold adapter.
Securewitha large hose
clamp.
3. Push the manifold
adapter with spring and
valve into the left port
(nearest the manifold
outlet) of the mix inlet
manifold and secure
with retaining clip. (See
Figure 2-4).
4. If using two mix bags,
repeat steps 1 to 3 for
the middle port.
5. Install a manifold plug
into each emptyinlet and
Figure 2-4 Bag Connection System (Optional)
Bag Adapter
Manifold
Adapter
Retaining
Clip
Mix Inlet
Manifold
Manifold
Plug
secure with a retaining clip.
6. Place the mix bag(s) into the mix container.
7. Connect the bag adapter attached to the left side
of the manifold (closest to the mix outlet) to the
mix bag in the back of the mix container.
C. MIX LOW LEVEL INDICATOR ADJUSTMENT
The sensitivity of the “Mix Low” indication can be adjusted
to operator preference. If more advanced notice of low mix
is required, loosen the black adjustment knobs located on
the sensor brackets at the back of the machine cabinet
and slide the bracket upwards. If the “Mix Low” message
(right side) or flashing light (left side) appears while there
is still sufficient mix in the container, slide the bracket
downward. Be sure to tighten the adjustment knobs after
properly positioning the sensor.