Stoelting U444A Service 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 specifi cations 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 pro­vide new parts for machines built prior to date of change.

DO NOT ATTEMPT 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.

stoeltingfoodservice.com

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: [e-mail]

© 2014 PW Stoelting, LLC

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
specifi c safety information, the following safety defi ni-
tions are provided to assist the reader.

The purpose of safety symbols is to attract your at­tention 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.

Safety Alert Symbol:

This symbol Indicates danger, warning or caution.

Attention is required in order to avoid serious per­sonal injury. The message that follows the symbol
contains important information about safety.

Signal Word:

Signal words are distinctive words used throughout

this manual that alert the reader to the existence and
relative degree of a hazard.

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” indicates a potentially

hazardous situation, which, if not avoided, may result
in minor or moderate 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 equip­ment/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 Specifi cations ............................................................................................. 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 Profi le 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

SECTION 1

DESCRIPTION AND SPECIFICATIONS

1.1 DESCRIPTION

The Stoelting SU444 and U444A fl oor 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 qualifi ed service per-
sonnel and operators with installation, operation and
maintenance of the SU444 and U444A.

Figure 1-1 Model SU444 Machine

Figure 1-2 Dimensions

1

1.2 SPECIFICATIONS

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

minimum circuit

ampacity

maximum overcurrent

protection device

Compressor

Drive Motor Soft Serve - 2 hp, Shake - 3/4 hp

Cooling

Hopper Volume Two - 8 gallon (30,28 liters)

Freezing Cylinder

Volume

SU444 Water Cooled SU444 Air Cooled

left right left right left right left right

31A 26A 19A 18A 32A 26A 20A 18A

50A 40A 30A 25A 50A 40A 30A 25A

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)

Water cooled units require 1/2” N.P.T.

water and drain fi ttings. Maximum

water pressure of 130 psi. Minimum
water fl ow 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.

Soft Serve - 1.33 gallon (5,4 liters)

Shake - 2.1 gallon (7,95 liters)

Air cooled units require 6” (15,2 cm) air

space on both sides and back.

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

* CutOut value needs to be adjusted to product
requirements

Refrigerant R-404A

Charge

Suction Pressure

Discharge Pressure

at 80ºF Ambient

Left Side - 46 oz

Right Side - 46 oz

Soft Serve - 23-24 psig

Shake - 28-30 psig

Soft Serve - 235-240 psig

Shake - 235-240 psig

Refrigerant R-134A

Charge 8 oz

Cab Suction

Pressure

SU444

Cabinet

18 psig

2

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.
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 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.

Figure 1-3 Serve Mode

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 1-4 Standby Mode

3

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 and Sl1DrOff), and allows product
to melt to a liquid state by using agitation cycles without
any fl 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 with­out 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”.

Figure 1-5 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 fi 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 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

Figure 1-6 Sleep 2 Mode

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 fi 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 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.

4

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 - Trouble­shooting for details). To clear this error, place the Freez­ing 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 moni­tor 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 fl ash. To clear the “Low Mix” error, add
mix to the cabinet’s mix container.

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.

1.5 STORAGE REFRIGERATION

The IntelliTec control is programmed to 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
fl 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 oc­curs. 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)

B. CABINET REFRIGERATION

In the event of a temperature sensor failure in the cabi­net, 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 pro­vides the advantage of having product maintained at a
specifi c temperature and consistency irrespective of the
supply voltage. A motor profi 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 profi le. This feature is
automatic and does not need any confi guring.

5

IntellITec Control Setting Specifi cations

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 - Specifi cation Sheet for SU444
Control located in the plastic pouch behind the header panel.

Table 1-1 IntelliTec Control Settings

6

1.8 LEFT SIDE CONTROL OPERATION

Temperature

Time

HI Relay Sensor
Cut In

HI Relay Sensor
Cut Out

Freezing Cycle

The soft serve side is run by a temperature control. Fol­lowing 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 resis­tance 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 serv­able state.

NOTE

If the sensor resistance is below the HI relay cutout,
the yellow LED will also light. The yellow LED will
remain lit until the sensor resistance reaches the 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 satisfi ed.

Temperature

Freezing Cycle

LO Relay Sensor
Cut Out

Time

LO Relay Sensor
Cut In

Figure 1-9Serve Mode

Figure 1-8 Standby Mode

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 freezing cylinder sensor. When the sensor resistance
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.

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.

7

8

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 la­bels 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 periodi­cally 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 machine has been assembled, operated and inspected
at the factory. Upon arrival at the fi nal 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 RESPON­SIBLE 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 short­ages 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 qualifi ed
electrician/refrigeration specialist.

Incorrect installation may cause personal injury,
severe damage to the machine and will void fac­tory warranty.

Installation of the machine involves moving the machine
close to its permanent location, removing all crating, set­ting 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 out casters 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 fi ttings.

2.4 INSTALLING WIRING

A. Refer to the nameplate on the side panel of the

machine for specifi c electrical 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 elec­trical loads require special attention when connect­ing 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
and could cause high head pressure errors from the
reduced air fl ow. Rewiring the fan motor prevents
the fan speed from decreasing to an unsuitable rate.

9

6” (15cm)

Figure 2-2 Mix Hose Installation

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

the Standby/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

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.

3. Gently push the hose into the black cover until it

begins to feed.

10

Figure 2-3 Mix Pump Connections for Standard Mix Container

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 fi tting
(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 confi guration.

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 fi tting 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).

When Using Bag Connection System (BCS) with Three
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. Connect 3/8” (9,5mm) ID plastic food grade tubing
to a bag adapter. Secure with hose clamps.

11

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) with One or T wo
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
plastic food grade tubing
to a 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.
Secure with a 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 empty inlet and

Manifold

Adapter

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 fl ashing light (left side) appears while there
is still suffi cient mix in the container, slide the bracket
downward. Be sure to tighten the adjustment knobs after
properly positioning the sensor.

Mix Inlet

Retaining

Clip

Manifold

Plug

Bag Adapter

Manifold

Figure 2-4 Bag Connection System (Optional)

12

SECTION 3

INITIAL SET-UP AND OPERATION

3.1 OPERATOR’S SAFETY PRECAUTIONS

SAFE OPERATION IS NO ACCIDENT; observe these
rules:

A. Know the machine. Read and understand the

Operating Instructions.
B. Notice all warning labels on the machine.
C. Wear proper clothing. Avoid loose fi tting garments,

and remove watches, rings or jewelry that could

cause a serious accident.
D. Maintain a clean work area. Avoid accidents by

cleaning up the area and keeping it clean.
E. Stay alert at all times. Know which switch, push

button or control you are about to use and what

effect it is going to have.
F. Disconnect power for maintenance. Never

attempt to repair or perform maintenance on the

machine until the main electrical power has been

disconnected.
G. Do not operate under unsafe operating conditions.

Never operate the machine if unusual or excessive

noise or vibration occurs.

3.2 OPERATING CONTROLS AND INDICATORS

Before operating the machine, it is required that the op­erator know the function of each operating control. Refer
to Figure 3-1 for the location of the operating controls on
the machine. For the information regarding error codes
displayed on the control panel, refer to the troubleshooting
section of this manual.

A. PUMP SWITCH (BOTH SIDES)

The pump motor switch is the toggle switch located under
the header panel. When the switch is placed in the OFF
position, the pump will not run. When the switch is placed
in the ON position, the pump will run until the preset pres­sure is reached. It then cycles on and off as product is
drawn to maintain that pressure.

B. SPIGOT SWITCH (BOTH SIDES)

The spigot switch is mounted to the spigot cam assembly
behind the header panel. When the spigot is opened to
dispense product, the spigot switch opens and the “Serve
Mode” begins.

Standby/Serve

Switch

Clean/Off/Serve

Switch

Mix Low

Indicator Light

Freezing

Switch

Pump

Off/On

Blender Power

Off/On Circuit

Breaker

Pump

Off/On

IntelliTec Control

(See Figure 3-2)

Freezing
Cylinder

Off/On

Cab Off

Indicator Light

Main Freezer

Power Off/On

Figure 3-1 SU444 Freezer Controls

13

C. FRONT DOOR SAFETY SWITCH (BOTH SIDES)

The front door safety switch prevents the auger from turn­ing when the front door is removed. The switch is open
when the door is removed and closed when the door is
properly installed.

D. DRIVE MOTOR OVERLOAD (BOTH SIDES)

The drive motor overload will trip if the drive motor is
overloaded. Single phase machines have an internal
overload and three phase machines have an external
overload. The overload will reset after approximately 10­12 minutes. If the drive motor continues to trip, refer to
the Troubleshooting Section.

E. DISPENSE RATE ADJUSTOR (LEFT SIDE)

The dispense rate adjustor is located under the header
panel, to the immediate right of each spigot handle. Turning
the knob counterclockwise will decrease the dispense rate.

F. CLEAN/OFF/SERVE SWITCH (LEFT SIDE)

The CLEAN-OFF-SERVE switch is a three position toggle
switch used to control the operation of the refrigeration
system and auger. When the switch is placed in the
CLEAN position, the refrigeration system will be off and
auger will rotate for cleaning. When the switch is placed
in the OFF position, the refrigeration system and auger
will not operate. When the switch is placed in the SERVE
position, the refrigeration system and auger will operate
automatically. The switch should be placed in the SERVE
position for normal operation.

G. STANDBY/SERVE SWITCH (LEFT SIDE)

The standby/serve switch is a two position toggle switch.
When the switch is placed in the standby position the
machine will cycle to maintain a temperature below 41°F
(-15°C). When the switch is in the Serve position the ma­chine will cycle to maintain a servable product.

H. FREEZING SWITCH (LEFT SIDE)

The freezing switch is a two position toggle switch. When
the switch is placed in the MAXIMUM position the machine
will be forced to run 30 seconds after the spigot is closed
if the temperature control is satisfi ed.

I. LOW MIX LIGHT (LEFT SIDE)

The low mix light will illuminate when the liquid level in
the mix container drops below the mix low level indicator.
(To adjust the indicator see Section 2.6 C.)

J. MAIN FREEZER POWER SWITCH (RIGHT SIDE)

The Main Freezer Power switch is a two position rocker
switch that supplies power to the IntelliTec control, the
right freezing cylinder circuits and the cabinet refrigeration
system. When the switch is placed in the ON position,
the cabinet refrigeration system will run until the preset
temperature is reached; then it will cycle ON and OFF to
maintain that temperature. Power to the right side freezing
cylinder can then be controlled with the Freezing Cylinder
OFF/ON switch.

K. FREEZING CYLINDER OFF/ON SWITCH (RIGHT

SIDE)

The Freezing Cylinder OFF/ON switch is a two position
toggle switch used to supply power to the right freezing
cylinder control circuit. When the switch is in the OFF
position, the freezing cylinder’s refrigeration system and
auger will not operate. When the switch is in the ON posi­tion, the machine will be operational.

L. BLENDER POWER OFF/ON AND CIRCUIT BREAKER

SWITCH (RIGHT SIDE - SU444 ONLY)

The Blender Power Off/On and Circuit Breaker switch is
a two position toggle switch used to supply power to the
blender. When the switch is in the OFF position, there is
no power to the blender. When the switch is in the ON
position, the blender will operate any time the spigot
handle is pushed to the right. This switch also serves as
a circuit breaker to interrupt power if the rotation of the
blender agitator becomes hindered.

M. CAB OFF INDICATOR LIGHT (RIGHT SIDE)

A fl ashing light indicates the Main Freezer Power Switch
is in the OFF position; no refrigeration is being supplied
to the cab. Place the Main Freezer Power switch in the
ON position for cab refrigeration.

N. PUSH TO FREEZE BUTTON (RIGHT SIDE)

The PUSH TO FREEZE button is a snap switch used to
initiate “Serve Mode”.

NOTE

After the PUSH TO FREEZE button is pressed,
the drive motor starts. After a 3-second delay, the
compressor will start.

O. LEDS (RIGHT SIDE)

The membrane switch (touchpad) features two lights: a
green LED and an amber LED. The green LED is lit dur­ing “Serve Mode”. During freeze down, it is not lit. When
product consistency approaches 75% in the freezing
cylinder, the green LED fl ashes. The amber LED is on
during all other modes. Both LEDs alternatively fl ash if
an error occurs or if the freezing cylinder is off.

P. CLEAN BUTTON (RIGHT SIDE)

The CLEAN button is a snap switch. When the button is
pressed, the freezing cycle stops and the drive motor will
start. A CLEAN message will display on the LCD screen
along with a 5-minute countdown timer. To exit the CLEAN
mode, turn the Freezing Cylinder OFF/ON switch to the
OFF position or press the CLEAN button again. If the
machine is left in CLEAN for more than 20 minutes, an
error code (E4) will be displayed on the display panel.
Place the Freezing Cylinder OFF/ON switch in the OFF
position and back in the ON position to clear this error.

Q. MIX LOW LIGHT INDICATOR (RIGHT SIDE)

A MIX LOW message will appear on the LCD display to
alert the operator of a low mix condition. The message
will display when there is approximately one gallon of mix
left in the mix container. When the MIX LOW message is
displayed, refi ll the container or replace a bag immediately.

14

Push to Freeze

Green LED

Amber LED
Purge/Clean

Button

SEL Button

SET Button

Left Arrow Button

Up Arrow Button

Figure 3-2 IntelliTec Control

R. MENU NAVIGATION BUTTONS (RIGHT SIDE)

The Menu Navigation Buttons allow the user to display
information regarding the machine’s status of operation
as well as adjust product consistency (Fig. 3-2).

Selection Button (SEL) The SEL button is used in

combination with the left arrow button to enter into

the settings of the IntelliTec control. This button is

also used to navigate through the control settings

menu.
Set Button (SET) The SET button is used to save

a change made to the product consistency setting.

It is also used to save changes when modifying

control settings.
Left Arrow Button () If the left arrow button is

pressed for 5 seconds, the display will remain lit.

To turn the light off, press the left arrow button for

5 seconds. The left arrow button is used primarily

to navigate through the control settings.
Up Arrow Button () After pressing the SET button,

the up arrow button will change the value of the

product consistency setting. This button is used

primarily to navigate through the control settings.

3.3 IMPORTANT INFORMATION REGARDING
CLEANING AND SANITIZING

Soft serve and shake machines require special consider­ation when it comes to food safety and proper cleaning
and sanitizing.

The following information specifi cally covers issues for
cleaning and sanitizing frozen dessert machines. This
information is meant to supplement a comprehensive
food safety program.

SOIL MATERIALS ASSOCIATED WITH FROZEN

DESSERT MACHINES

MILKFAT/BUTTERFAT – As components of ice-cream/
frozen custard mix, these soils will accumulate on the
interior surfaces of the machine and its parts. Fats are
diffi cult to remove and help attribute to milkstone buildup.

MILKSTONE – Is a white/gray fi lm that forms on equip-
ment and utensils that are exposed to dairy products.
These fi lms will accumulate slowly on surfaces because of
ineffective cleaning, use of hard water, or both. Milkstone
is usually a porous deposit, which will harbor microbial
contaminants and eventually defy sanitizing efforts.

Once milkstone has formed, it is very diffi cult to remove.
Without using the correct product and procedure, it is
nearly impossible to remove a thick layer of milkstone.

(NOTE: general-purpose cleaners DO NOT remove
milkstone.) This can lead to high bacteria counts and a
food safety dilemma.

IT IS BEST TO CONTROL MILKSTONE ON A DAILY BA­SIS BEFORE IT CAN BECOME A SIGNIFICANT FOOD
SAFETY PROBLEM.

In addition to food safety, milkstone can cause prema­ture wear to machine parts, which can add to costs for
replacement parts or possibly more expensive repairs
if worn machine parts are not replaced once they have
become excessively worn.

IMPORTANT DIFFERENCES BETWEEN CLEANING

AND SANITIZING

CLEANING vs. SANITIZING
It is important to distinguish between cleaning and sanitiz-

ing. Although these terms may sound synonymous, they
are not. BOTH are required for adequate food safety and
proper machine maintenance.

CLEANING

· Is the removal of soil materials from a surface.

· Is a prerequisite for effective sanitizing.

NOTE

An UNCLEAN surface will harbor bacteria that can
defy sanitizing efforts.

Bacteria can develop and resist sanitizing efforts within
a layer of soil material (milkstone). Thorough cleaning
procedures that involve milkstone removal are critical for
operators of frozen dessert machines.

SANITIZING

· Kills bacteria.

· Can be effective on clean surfaces only.

NOTE

Using a SANITIZER on an unclean surface will not
guarantee a clean and safe frozen dessert machine.

15

PROPER DAILY MAINTENANCE:

The Only Way to Assure Food Safety and Product Quality
Proper daily maintenance can involve a wide variety

of products and procedures. Overall, the products and
procedures fall into three separate categories. (Please
note that this is a brief overview intended for informational
purposes only.)

1. CLEANING – This involves draining mix from

the freezing cylinder and rinsing the machine

with water. Next, a cleaner is run through the

machine. Then, the machine is disassembled

and removable parts are taken to the sink for

cleaning.

2. MILKSTONE REMOVAL – Since most cleaners

do not have the ability to remove milkstone, the

use of a delimer becomes necessary. Although

this procedure may not be needed on a daily

basis, it will usually follow the cleaning procedure.

It requires letting a delimer solution soak in the

machine for an extended period. Individual parts

are also soaked in a deliming solution for an

extended period of time (more about delimers in

Additional Information).

3. SANITIZING – After the machine has been

cleaned and contains no milkstone, the machine

is reassembled. Then a FDA-approved sanitizing

solution is run through the machine to kill bacteria.

The machine is then ready for food preparation.
As a recommended cleaner and sanitizer for your frozen

dessert machine, STERA-SHEEN has proven to be one
of the best daily maintenance products for:

· CLEANING – Thorough removal of all solids

including butterfat and milk fat.

· MILKSTONE REMOVAL – Complete removal of

milkstone.

· SANITIZING – FDA-approved no rinse sanitizer

for food contact surfaces.

ADDITIONAL INFORMATION

THE USE OF DELIMERS
A delimer is a strong acid that has the ability to dissolve

milkstone. This type of chemical may become necessary
once high levels of milkstone have developed. While these
products are very effective for removing HIGH levels of
milkstone, they are not ideal for two reasons:

1. PRODUCT SAFETY – Strong acids are dangerous

chemicals. Carefully follow safety instructions

provided with delimer products.

2. MACHINE DAMAGE – Strong acids will attack

metal and rubber causing premature wear of

parts. The use of a delimer needs to be closely

monitored to avoid damage to machine surfaces

and parts.
With proper daily use of STERA-SHEEN or its equivalent,

there is no need for the use of a DELIMER.

DO NOT USE BLEACH

· BLEACH HAS ABSOLUTELY NO CLEANING
PROPERTIES.

· BLEACH IS CORROSIVE. It will damage
components of the machine causing premature
wear and metal corrosion.

GENERAL PURPOSE CLEANERS
General purpose cleaners do not have the ability to re-

move milkstone. Milkstone will become a problem if not
remedied with additional products and procedures.

THE USE OF CHLORINE TEST STRIPS
“Test strips” are used to determine concentrations of

active chlorine in sanitizing solutions. To use the strips,
tear off a small portion and submerge it into the sanitizing
solution. Then, compare the color change to the color key
on the side of the test strip dispenser to determine the
approximate chlorine concentration.

The ideal concentration of chlorine needs to be 100 ppm
(as stated by the FDA).

NOTE

Follow the directions on the container for proper
concentration.

Two main factors contribute to falling chlorine concentra­tions in a sanitizing solution.

1. PRODUCT USE – As the chlorine in the solution
is being used, chlorine concentrations fall.

2. TIME – As time passes, small amounts of chlorine
“evaporate” from the solution. (That is why you
can smell it.)

Sanitizing solutions should not be allowed to fall below
100 ppm chlorine. New solutions should be mixed once
old solutions become ineffective.

3.4 DISASSEMBLY OF LEFT SIDE

WARNING

Moving machinery can grab, mangle and dis­member. Place the Clean/Off/Serve switch in the
OFF position before disassembling for cleaning or
servicing.

Before using the machine for the fi rst time, complete
machine disassembly, cleaning and sanitizing proce­dures need to be followed. Routine cleaning intervals
and procedures must comply with the local and state
health codes. Inspection for worn or broken parts should
be made at every disassembly of the machine. All worn
or broken parts should be replaced to ensure safety to
both the operator and the customer and to maintain good
machine performance and a quality product.

To disassemble the left side, refer to the following steps:

16

A. REMOVE FRONT DOOR AND AUGER

1. Make sure the Clean/Off/Serve switch is in the
OFF position

2. Remove the knobs on the front door and remove
the door by pulling it off the studs.

3. Remove the air bleed valve by unscrewing the
knob while holding the valve stem from behind.
Remove the compression spring and push the
air bleed valve through the rear of the front door.

Before using the machine for the fi rst time, complete
machine disassembly, cleaning and sanitizing proce­dures need to be followed. Routine cleaning intervals
and procedures must comply with the local and state
health codes. Inspection for worn or broken parts should
be made at every disassembly of the machine. All worn
or broken parts should be replaced to ensure safety to
both the operator and the customer and to maintain good
machine performance and a quality product.

To disassemble the machine, refer to the following steps:

A. REMOVE BLENDER (SU444 ONLY)

1. Make sure the Main Freezer Power Off/On switch
is in the OFF position.

2. Unplug the blender.

3. Remove the blender agitator by holding the blender
shaft and turning the agitator counterclockwise.
Remove the blender shaft by holding the blender
collar and turning the shaft counterclockwise.
(Figure 3-3)

Figure 3-2 Left Side Front Door

4. Remove the spigot through the bottom of the front
door. Remove all o-rings from the spigot and the
air bleed valve.

5. Remove the front auger support and plastic
bearing.

6. Remove the auger by pulling slowly and rotating
out of the machine barrel. As the auger is
withdrawn, remove each plastic fl ight and spring
from the auger. Be careful not to scratch inside of
machine barrel when removing fl ights or auger.
Remove the spring from each auger fl ight.

7. Keep the rear of the auger tipped up once it is
clear of the freezing cylinder to prevent the rear
seal assembly from dropping.

8. Wipe the hex drive anti-seize off the hex end of
the auger with a paper towel. Remove the rear
seal assembly.

NOTE

Keep the rear seal assembly separate from the
right side assembly to prevent problems when as­sembling.

3.5 DISASSEMBLY OF RIGHT SIDE

WARNING

Moving machinery can grab, mangle and dismem­ber. Place the Main Freezer Power Off/On switch in
the OFF position before disassembling for cleaning
or servicing.

Collar

Shaft

Figure 3-3 SU444 Blender Agitator Assembly

4. Loosen knobs holding the blender splash shield
bracket in place and remove the bracket.

5. Remove the knobs on the front door. Remove
the blender assembly and set aside.

NOTE

Support the blender with one hand while removing
the knobs on the door to prevent the blender from
dropping.

B. REMOVE FRONT DOOR AND AUGER

1. Make sure the Main Freezer Power Off/On switch
is in the OFF position

2. Remove the knobs on the front door and remove
the door by pulling it off the studs.

17

Agitator

3. Remove the air bleed valve by unscrewing the
knob while holding the valve stem from behind.
Remove the compression spring and push the
air bleed valve through the rear of the front door.

4. Remove the spigot through the bottom of the front
door. Remove all o-rings from the spigot and the
air bleed valve.

5. Remove the plastic bearing. The plastic bearing
may be on the front door.

6. Remove the auger by pulling slowly. Be careful
not to scratch the inside of the freezing cylinder
when removing the auger.

7. Keep the rear of the auger tipped up once it is
clear of the freezing cylinder to prevent the rear
seal assembly from dropping.

8. Wipe the hex drive anti-seize off the hex end of
the auger with a paper towel. Remove the rear
seal assembly.

NOTE

Keep the rear seal assembly separate from the
right side assembly to prevent problems when as­sembling.

3.6 CLEANING DISASSEMBLED PARTS

Disassembled parts require complete cleaning, sanitiz­ing and air drying before assembling. Local and state
health codes will dictate the procedure required. Some
state health codes require a four sink process (pre-wash,
wash, rinse, sanitize, air dry), while others require a three
sink process (without the pre-wash step). The following
procedures are a general guideline only. Consult your
local and state health codes for the procedures required
in your location.

A. Disassemble all parts.
B. Place all front door and auger parts in clean 90° to

110°F (32°C to 43°C) water and wash thoroughly
(four sink procedure only).

CAUTION

The blender motor cannot be immersed in water
or sanitizer. Wash the motor and mounting bracket
with a mild detergent solution taking care not to al­low water into the motor bearings or seals.

C. Place all parts in 90° to 110°F (32°C to 43°C) mild

detergent water and wash thoroughly.

D. Rinse all parts with clean 90° to 110°F (32°C to

43°C) water.

E. Sanitize all machine parts following procedures

outlined below.

3.7 SANITIZING PARTS

A. Use a sanitizer, mixed according to manufacturer’s

instructions, to provide a 100 parts per million
strength solution. Mix sanitizer in quantities of
no less than 2 gallons of 90° to 110°F (32°C to
43°C) water. Any sanitizer must be used only in
accordance with the manufacturer’s instructions.

B. Place all parts in the sanitizing solution for 5

minutes, then remove and let air dry completely
before assembling in machine.

3.8 CLEANING THE MACHINE

The exterior should be kept clean at all times to preserve
the luster of the stainless steel. A high grade of stainless
steel has been used on the machine to ease cleanup. To
remove spilled or dried mix, wash the exterior with 90° to
110°F (32°C to 43°C) soapy water and wipe dry.

Do not use highly abrasive materials, as they will mar the
fi nish. A mild alkaline cleaner is recommended. Use a soft
cloth or sponge to apply the cleaner. For best results, wipe
with the grain of the steel.

A. Clean the rear seal surfaces on the inside of the

freezing cylinders.

B. Using sanitizing solution and the large barrel

brush provided, sanitize the freezing cylinders by
dipping the brush in the sanitizing solution and
brushing the inside of the freezing cylinders.

C. Remove the drip trays from the front panel. Clean

and replace the drip trays.

3.9 ASSEMBLING THE LEFT SIDE

Refer to the following steps for assembling the left freez­ing cylinder:

NOTICE

Petrol-Gel sanitary lubricant or equivalent must be
used when lubrication of machine parts is specifi ed.

NOTICE

The United States Department of Agriculture and
the Food and Drug Administration require that lubri­cants used on food processing equipment be certi­fi ed for this use. Use lubricants only in accordance
with the manufacturer’s instructions.

A. Assemble all o-rings onto parts dry, without

lubrication. Then apply a thin fi lm of sanitary
lubricant to exposed surfaces of the o-rings.

B. Install the rear seal o-ring. Lubricate the outside

of the rear seal o-ring with sanitary lubricant.

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