Stoelting U412 Operators Manual

Model U412 Series

SERVICE MANUAL

Manual No. 513630 Rev.2

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: 800.558.5807 Fax: 920.894.7029

Customer Service: 888.429.5920 Fax: 800.545.0662 Email: foodservice@stoelting.com

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 Description and Speciﬁ cations

1.1 Description .................................................................................................. 1

1.2 Speciﬁ cations ............................................................................................. 2

1.3 Modes of Normal Operation .......................................................................3

1.4 Mix Level Indicators .................................................................................... 5

1.5 Storage Refrigeration .................................................................................5

1.6 Operation During Sensor Failure ................................................................ 5

1.7 Motor Proﬁ le Cutout Compensation ........................................................... 5

2 Installation Instructions

2.1 Safety Precautions .....................................................................................7

2.2 Shipment and Transit ..................................................................................7

2.3 Machine Installation .................................................................................... 7

2.4 Installing Permanent Wiring ........................................................................ 7

2.5 Mix Pump .................................................................................................... 8

A. Mix Pump Hose Installation..................................................................................8

B. Mix Pickup Hose Installation ................................................................................8

C. Mix Low Level Indicator Adjustment ..................................................................... 10

3 Initial Set-Up and Operation

3.1 Operator’s Safety Precautions ................................................................... 11

3.2 Operating Controls and Indicators .............................................................. 11

3.3 Disassembly of Machine Parts ................................................................... 13

A. Disassembly of Blender and Front Door ..............................................................13

B. Disassembly of Auger ..........................................................................................13

3.4 Cleaning Disassembled Parts ....................................................................13

3.5 Sanitizing Machine Parts ............................................................................14

3.6 Cleaning the Machine ................................................................................. 14

3.7 Assembling Machine ..................................................................................14

3.8 Sanitizing .................................................................................................... 15

3.9 Initial Freeze Down and Operation .............................................................16

A. Adding Mix ........................................................................................................... 16

B. Preparing the IntelliTec Control ............................................................................16

C. Initial Freeze Down ..............................................................................................17

D. Adjusting the IntelliTec Control ............................................................................. 17

E. Serving Product....................................................................................................17

3.10 Normal Freeze Down and Operation .......................................................... 17

3.11 Mix Information ...........................................................................................18

3.12 Operation of Mix Pump ............................................................................... 18

3.13 Mix Pump Cleaning ....................................................................................19

3.14 Disassembly and Inspection of Removable Parts ...................................... 19

Section Description Page 4 Maintenance and Adjustments

4.1 Freezer Adjustment .................................................................................... 21

4.2 Product Consistency Adjustment ................................................................ 21

4.3 Locking the Control Panel ..........................................................................21

4.4 Obtaining Readings and Modifying Settings (Service Personnel Only) ...... 21

4.5 Readings (Service Personnel Only) ...........................................................22

4.6 Adjustments (Service Personnel Only) ....................................................... 23

4.7 Other Settings (Service Personnel Only) .................................................... 23

4.8 Overrun Adjustment .................................................................................... 24

4.9 Mix Pump Hose Reposition ........................................................................ 25

4.10 Mix Pump Hose Replacement ....................................................................25

4.11 Cab Temperature Adjustment ..................................................................... 26

4.12 Drive Belt Tension Adjustment .................................................................... 26

4.13 Condenser Cleaning (Air-Cooled Freezers) ............................................... 27

4.14 Preventative Maintenance .......................................................................... 27

4.15 Extended Storage ....................................................................................... 27

5 Refrigeration System

5.1 Refrigeration System .................................................................................. 29

5.2 Refrigerant Recovery and Evacuation ........................................................ 29

5.3 Refrigerant Charging .................................................................................. 30

5.4 Compressor ................................................................................................ 31

5.5 Condenser .................................................................................................. 32

5.6 Evaporator .................................................................................................. 32

5.7 Valves ......................................................................................................... 32

A. Thermostatic Expansion Valve (TXV) ..................................................................32

B. Check Valve ......................................................................................................... 33

C. High Pressure Cutout ........................................................................................... 33

D. Hot Gas Bypass ...................................................................................................34

E. Evaporator Pressure Regulator (EPR) ................................................................. 35

F. Water Valve (Water Cooled Models Only) ............................................................ 35

5.8 Solenoid ...................................................................................................... 36

5.9 Filter Drier ................................................................................................... 37

5.10 Capillary Tube .............................................................................................38

5.11 Cab Unit ......................................................................................................38

Section Description Page 6 Electrical and Mechanical Control Systems

6.1 IntelliTec Controller ..................................................................................... 39

6.2 Contactors .................................................................................................. 39

6.3 Drive Motor ................................................................................................. 40

6.4 Capacitors ..................................................................................................40

6.5 Gearbox ...................................................................................................... 41

6.6 Condenser Fan Motor (Air-Cooled Only) .................................................... 42

6.7 Cab Condenser Fan Motor .........................................................................42

6.8 Switches ..................................................................................................... 43

A. Spigot Switch ....................................................................................................... 43

B. Blender Activation Switch .....................................................................................44

C. Pump Pressure Switch ......................................................................................... 44

6.9 Potential Relay ...........................................................................................45

6.10 Temperature Control Sensor ......................................................................45

6.11 Spinner Speed Control Harness ................................................................. 45

7 Troubleshooting

7.1 Error Codes ................................................................................................ 47

7.2 Troubleshooting - Error Codes ................................................................... 47

7.3 Troubleshooting - Machine .........................................................................50

7.4 Troubleshooting - Mix Pump ....................................................................... 51

8 Replacement Parts

8.1 Auger Shaft and Front Door Parts ..............................................................53

8.2 Blender Parts and Trays ............................................................................. 54

8.3 Cab Tubing Assembly ................................................................................. 55

8.4 Spigot Cam Assembly ................................................................................ 56

8.5 Front Panel ................................................................................................. 57

8.6 Part Kits ...................................................................................................... 57

8.7 Pump Parts ................................................................................................. 58

8.8 Cab Interior ................................................................................................. 60

8.9 Header Panel - Electrical ............................................................................ 61

8.10 Left Hand Side ............................................................................................ 62

8.11 Right Hand Side .........................................................................................63

8.12 Rear ............................................................................................................ 64

8.13 Brushes, Decals and Lubrication ................................................................ 65

8.14 Stainless Steel Panels ................................................................................ 65

8.15 Refrigeration Diagram and Wiring Diagram ................................................ 66

SECTION 1

DESCRIPTION AND SPECIFICATIONS

1.1 DESCRIPTION

The U412 is an ultra high capacity ﬂ oor model shake machine. It is equipped with fully automatic controls to provide a uniform product. This manual is designed to assist qualiﬁ ed service personnel and operators with instal- lation, operation and maintenance of the U412 machine.

Figure 1-1 Model SU412 Machine

Figure 1-2 Machine Dimensions

1.2 SPECIFICATIONS

Dimensions Machine with crate

width 19-1/8’’ (48,6 cm) 27’’ (68,6 cm)

height 67’’ (170,2 cm) 78’’ (198,1 cm)

depth 38-3/4’’ (98,4 cm) 48’’ (121,9 cm)

Weight 450 lbs (204,1 kg) 650 lbs (294,8 kg)

Electrical 1 Phase, 208-240 VAC, 60Hz

circuit ampacity

overcurrent protection

device

Compressor 11,000 Btu/hr Scroll™ Compressor

Drive Motor 3/4 hp

Air Flow Air cooled units require 3” (7,6 cm) air space on both sides, 6” back.

Plumbing Fittings

Hopper Volume 8 gallons (30,29 liters)

Freezing Cylinder

Volume

Model SU412

19A minimum

30A maximum

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

2.1 gallon (7,95 liters)

Production Capacity 30 GPH (113,56 liters)

SU412

Refrigerant R-404A

Charge 32 oz

Suction Pressure

(at 72°F)

Discharge Pressure 210-235 psig

Cab Pressure

(only cab running)

EPR Valve 78-80 psig

18 psig (maintained by the bypass valve)

25-27 psig

Advanced On Time 28 seconds

* CutOut amps must be set on site.

Menu Display Value

Basic CutOut * amps

Cut In T 26.5 °F

Cycles 20 count Stir On 15 seconds Stir Off 300 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 3 Cabinet

CabCutIn 38 °F CabCtOut 34 °F

Cab Off 13 minutes Cab On 130 seconds

U412 Conﬁ gurations

Model Spinner Speed

U412 Standard - TU412 Extra Thick - SU412 Standard with Spinner 1600 rpm

STU412 Extra Thick with Spinner 2400 rpm

1.3 MODES OF NORMAL OPERATION

Following are details of the operational modes on the U412.

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

The “Standby Mode” maintains product quality during slow times, while minimizing reactivation time. This mode lasts for a preset time (Stb Time). Once this time has been reached without user interruption, the control moves into the “Sleep 1 Mode”. Refer to Figure 1-4 for a graphical representation of the “Standby Mode”.

If a spigot is opened or the PUSH TO FREEZE button is pressed, the control will move to “Serve Mode”. Product in the front of the freezing cylinders may or may not be at consistency. The state of the product is dependent on a number of variables but will come to consistency quickly.

D. SLEEP 1 MODE

After the “Standby Mode” time has expired without user interruption, the control will move into the “Sleep 1 Mode”. During the “Sleep 1 Mode”, the stir cycle is handled by preset timers (Sl1DrvOn and 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 40°F. The stir cycle and the auger do not run during “Sleep 3 Mode”.

The control will exit “Sleep 3 Mode” if the PUSH TO FREEZE button is pressed, the spigot is pulled, or the Freezing Cylinder OFF/ON switch is placed in the OFF position.

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.

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)

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 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.

IntellITec Control Setting Speciﬁ cations

Basic Menu DISPLAY Value MODE DEFINITION

CutOut * Serve Amp draw setting for cut out

Cut In T 26.5°F Serve Temperature setting for cut in

Cycles 20 Serve Freezing cycles before going into Standby Mode

Stir On 15 sec Serve Stir-only on time

Stir 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 sec 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 2183775 - Speciﬁ cation Sheet for SU412 Control located in the plastic pouch behind the header panel.

Table 1-1 IntelliTec Control Setting Speciﬁ cations

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, INC.

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.

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 3” (7,5cm) of space on all sides and 10” (25cm) at the top for proper circulation. (Fig. 2-1)

Figure 2-1 Space and Ventilation Requirements

E. Machines that have a water cooled condenser

require 1/2” NPT supply and drain ﬁ ttings.

2.4 INSTALLING PERMANENT WIRING

To install wiring follow the steps below:

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.

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.

Installation of the machine involves moving the machine close to its permanent location, removing all crating, setting in place, assembling parts, and cleaning.

6” (15cm)

Figure 2-2 Mix Hose Installation

2.5 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 at the top of the cabinet.

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.

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 U412 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. Connect a 2” (5cm) length of 3/8” (9,5mm) ID plastic food grade tubing to the mix pickup assembly. Secure with hose clamps. Place the assembly through the hole in the cover and install the retaining clip.

Figure 2-3 Mix Pump Connections for Standard Mix Container

2. Connect the free end of the tubing to the mix check valve. Observe the direction of the check valve ﬂ ow arrow. Secure with a hose clamp. Connect a 24” (61cm) length of 3/8” (9,5mm) ID plastic food grade tubing to the free end of the check valve and 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.

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. (Fig. 2-5).

Mix Outlet

Drains

Last

Figure 2-4 BCS Mix Inlet Manifold

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 Two 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 2-5).

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 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.

Manifold

Adapter

C. MIX LOW LEVEL INDICATOR ADJUSTMENT

The sensitivity of the “Mix Low” indication that displays on the control panel 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 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 2-5 Bag Connection System (Optional)

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. MAIN FREEZER POWER SWITCH

The Main Freezer Power switch is a two position rocker switch that supplies power to the IntelliTec control, freezing cylinder circuits lower 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 freezing cylinders can then be controlled with the Freezing Cylinder OFF/ON switch.

B. FREEZING CYLINDER OFF/ON SWITCH

The Freezing Cylinder OFF/ON switch is a two position toggle switch used to supply power to the 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.

Main Freezer

Power Off/On

Cab Off

Indicator Light

Blender Power Off/

On Circuit Breaker

Freezing Cylinder

Off/On

IntelliTec Control

(See Figure 3-2)

Pump

Off/On

Figure 3-1 Machine Controls

C. SPIGOT SWITCH

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.

D. BLENDER POWER OFF/ON AND CIRCUIT BREAKER

SWITCH

The Blender Power Off/On and Circuit Breaker switch is a two position toggle switch used to supply power to the blender (SU412 models). 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.

E. CAB OFF INDICATOR LIGHT

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.

F. PUMP SWITCH

The pump motor switch is the toggle switch located on the front of the machine. 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.

G. PUSH TO FREEZE BUTTON

The PUSH TO FREEZE button is a membrane or 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.

H. LEDS

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 90% 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.

I. CLEAN BUTTON

The CLEAN button is a membrane, or 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. If the button is pressed again, the timer will reset. To exit the CLEAN mode, turn the Freezing Cylinder OFF/ ON switch to the OFF position. 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.

J. DRIVE MOTOR OVERLOAD

The internal drive motor overload will trip if the drive motor is overloaded. It will reset after approximately 1012 minutes. If the drive motor continues to trip, refer to Troubleshooting in Section 5.

K. MIX LOW LIGHT INDICATOR

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 or when one bag of the Bag Connection System (BCS) is empty. When the MIX LOW message is displayed, reﬁ ll the container or replace a bag immediately.

L. MENU NAVIGATION BUTTONS

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.

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

3.3 DISASSEMBLY OF MACHINE PARTS

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.

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 (SU412 MODELS)

1. Turn the Main Freezer Power Off/On switch to the OFF position.

2. Unplug the blender.

3. Remove the blender agitator by holding the blender shaft and turning the agitator counterclockwise.

4. Loosen knobs holding the blender splash shield bracket in place and remove the bracket (Fig. 3-3).

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.

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 from the front auger support. 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 spline lubricant off of the hex end of the auger with a paper towel. Remove the rear seal assembly (Fig. 3-4).

Remove O-Ring

From Inside Insert

Figure 3-3 Removing Splash Shield 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.

Figure 3-4 Rear Seal Assembly

3.4 CLEANING DISASSEMBLED PARTS

Disassembled machine 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. (Refer to Section 3.4 for

the disassembly of machine 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

Blender motor can NOT 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.

3.5 SANITIZING MACHINE 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.

3.7 ASSEMBLING MACHINE

To assemble the machine parts, refer to the following steps:

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 lubrication to exposed surfaces of the o-rings.

B. Lubricate the rear seal area on the auger shaft

with a thin layer of sanitary lubricant. Install the rear seal o-ring. Lubricate the outside of the rear seal o-ring with sanitary lubricant.

C. Install the stainless steel rear seal adapter into

the rear seal dry (without lubricant). Lubricate the inside surface of the rear seal adapter, including the adapter o-ring, and install it onto the auger shaft. DO NOT lubricate the outside of the rear auger seal (Fig. 3-5).

Petrol-Gel

3.6 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 surface from inside of the

freezing cylinder.

B. Using sanitizing solution and the large barrel

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

C. Remove the rear drip tray by pulling from the side

panel. Clean and replace the drip tray.

Place O-Ring

Inside Insert

Spline

Lubricant

Figure 3-5 Rear Seal Assembly

D. Lubricate the hex drive end of the auger with a

small amount of spline lubricant. A small container of it is shipped with the machine.

E. Install the two plastic scraper blades onto the

auger and insert into the freezing cylinder.

F. Rotate the auger until it engages the drive shaft.

G. Assemble the air bleed valve o-ring onto the air

bleed valve. Position the o-ring into the groove close to the wide part. Apply a thin ﬁ lm of sanitary lubricant to the o-ring.

Figure 3-7 Blender Shroud Pin Alignment

Figure 3-6 Front Door Assembly

H. Insert the air bleed valve into the back of the front

door. Install the compression spring onto the air bleed valve then screw the knob on ﬁ nger tight.

I Install the spigot through the bottom of the front

door.

J. Apply a thin ﬁ lm of sanitary lubricant to the door

seal o-ring, and ﬁ t it into the groove on the rear of the front door.

K. Apply a thin ﬁ lm of sanitary lubricant to the inside

and outside of the front auger support bushing, then place it into the front door.

L. Place the front door assembly on the mounting

studs and the push front door against the machine carefully.

M. Place the blender assembly onto the front door

studs.

N. Secure the front door and the blender assembly

to the machine by placing the knobs on the studs and alternately tightening opposite corners until ﬁ nger tight. Do not overtighten. Proper o-ring seal can be observed through the transparent front door.

O. On SU412 model, attach the blender shroud to

the blender assembly. The blender shroud has a pin that needs to be properly aligned with the machine safety switch (Fig. 3-7).

3.8 SANITIZING

Sanitizing must be done after the machine is clean and just before the machine is ﬁ lled with mix. Sanitizing the night before is not effective. However, you should always clean the machine and parts after using it.

NOTE

The United States Department of Agriculture and the Food and Drug Administration require that all cleaning and sanitizing solutions used with food processing equipment be certiﬁ ed for this use.

When sanitizing the machine, refer to local sanitary regulations for applicable codes and recommended sanitizing products and procedures. The frequency of sanitizing must comply with local health regulations. Mix sanitizer 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°F to 110°F (32°C to 43°C) water. Allow sanitizer to contact the surfaces to be sanitized for 5 minutes. Any sanitizer must be used only in accordance with the manufacturer’s instructions.

CAUTION

Risk of Product Damage

Avoid prolonged contact of sanitizer with machine parts. Sanitizer may cause corrosion of stainless steel parts if there is prolonged contact.

A. Prepare 3 gallons of sanitizing solution following

the manufacturer’s instructions. Pour it into a clean container and place the container into the cabinet.

Air Bleed

Valve

Figure 3-8 Air Bleed Valve

B. Place the mix pump switch in the ON position

and open the air bleed valve on the front door by pushing the valve in and holding (see Figure 3-8).

C. Let sanitizing solution ﬁ ll the freezing cylinder to

the air bleed valve. Close the valve by pulling it out to lock it into place.

D. Place the Main Power OFF/ON and Freezing

Cylinder OFF/ON switches in the ON position. Press the CLEAN button.

E. Check for leaks when the freezing cylinder is ﬁ rst

pressurized with sanitizing solution.

1. Check for leaks at the front door seals.

2. Check the drain tray located in the side panel for leaks coming from the rear of the rear auger seal.

3. Check the inside of the cab unit for leaks at the hose connections.

F. Using a sanitized soft bristle brush (or equivalent)

dipped in sanitizing solution, clean the mix container.

G. After ﬁ ve minutes, open the spigot to expel

sanitizing solution. Drain all of the solution from the machine.

H. When the solution has drained, press the CLEAN

button to stop the auger and place the Main Power OFF/ON and Freezing Cylinder OFF/ON switches in the OFF position. Allow the freezing cylinder to drain completely.

I. On SU412 model, sanitize the agitator and shaft

with a cup of sanitizing solution.

The machine is now sanitized and ready for adding mix.

3.9 INITIAL FREEZE DOWN AND OPERATION

Every Stoelting soft serve machine needs to be set on site.

The following adjustment will provide optimal product consistency while prolonging product life.

NOTE

The machine is designed for correct operation in ambient temperatures between 50°F and 110°F. T emperatures out of that range may cause refrigeration problems and product quality issues.

A. ADDING MIX

1. Sanitize the machine immediately before use.

2. Make sure the Freezing Cylinder OFF/ON switch is in the OFF position.

3. Fill the mix container in the cab with at least 2.5 gallons of mix.

4. Attach the mix inlet probe to the container and place the container in the refrigerated cab.

5. The mix pump switch is located at the front of the machine. Place it in the ON position.

6. Place a container under the spigot and open the spigot to allow the mix to ﬂ ush out about 8 ounces (0.23 liters) of sanitizing solution and liquid mix. Close the spigot.

7. Open the air bleed valve on the front door by pressing and holding. Hold the valve open until the mix level in the freezing cylinder is 1/2” from the air bleed valve.

B. PREPARING THE INTELLITEC CONTROL

8. On the IntelliTec control, press and hold the SEL button for 8 seconds. While still holding the SEL button, press the up arrow () button. The LCD will read “DISPLAY”.

9. Press the left arrow () button once. The display will read “BASIC”.

10. Press the up arrow () button once. The display will read “CutOut amps”.

11. Press the SET button. A cursor will start blinking under the far right digit.

12. Change the value to 8.0. Press the left arrow () button to move the cursor. Press the up arrow () button to increase the digit. When a digit reaches 9, pressing the up arrow () button again will change the value to 0.

13. After entering 8.0, press SET to save this value. The LCD will read “CutOut Set -- OK”.

14. Press the SEL button. The LCD will read “CutOut amps 8.0”.

15. Press the SEL button twice. The LCD will read “DISPLAY”.

16. Press the up arrow () button to navigate to the “°F” and “amps” readings.

C. INITIAL FREEZE DOWN

17. Place the Freezing Cylinder OFF/ON switch in the ON position.

18. Press the PUSH TO FREEZE button.

NOTE

After the drive motor starts, there is a 3-second delay before the compressor starts.

19. As the product freezes, the “amps” value on the display will increase. When it reaches 2.8A, open the spigot, take a 6-8 ounce sample and measure the temperature. For most shake mixes, the desired temperature is between 23.5°F and

24.0°F.

CAUTION

Do not exceed 3.5 amps with a 3/4 hp motor.

20. Draw samples at every increase of 0.2A until reaching the desired consistency and temperature.

NOTE

Show the sample to the customer and make sure it meets their required consistency and temperature.

21. Record the “amps” value.

22. Place the Freezing Cylinder OFF/ON switch in the OFF position.

D. ADJUSTING THE INTELLITEC CONTROL

23. Press the SEL button. The display will read “DISPLAY”.

24. Press the left arrow () button once. The display will read “BASIC”.

25. Press the up arrow () button once. The display will read “CutOut amps”.

26. Change the value to the recorded value by pressing the SET button. A cursor will start blinking under the far right digit.

27. Press the left arrow () button to move the cursor. Press the up arrow () button to increase the digit. When a digit reaches 9, pressing the up arrow () button again will change the value to 0.

28. Press the SET button to save the value. The LCD will read “CutOut Set -- OK”.

29. Press the SEL button. The LCD will read “CutOut amps” along with the programmed value from the previous step.

30. Press the SEL button three times. The LCD will read “EXITMENU”.

31. Press the up arrow () button to exit the menu.

32. Adjustment to the control is completed.

E. SERVING PRODUCT

33. Place the Freezing Cylinder OFF/ON switch in the ON position.

34. Press the PUSH TO FREEZE button.

35. When the product is at 75% consistency, the display will read “SERVE”.

36. For normal dispensing, move the spigot handle fully open.

37. The machine dispenses product at a reasonable draw rate. If the machine is overdrawn, the result is a soft product or a product that will not dispense at all. If this occurs, allow the machine to run for approximately 30 seconds before dispensing more product.

38. Do not operate the machine when the MIX LOW message is displayed. Reﬁ ll the mix container immediately.

NOTE

The machine has a standby and sleep mode. After a preset number of freezing cycles, it will enter the standby mode (followed by sleep mode) and remain there until someone draws product or presses the PUSH TO FREEZE button. In the sleep mode, the machine will keep the product below 41°F (7.2°C). Sleep modes do not take the place of cleaning and sanitizing. Federal, State, and local regulatory agencies determine frequency of cleaning and sanitizing.

3.10 NORMAL FREEZE DOWN AND

OPERATION

The following section contains the recommended operating procedures for the safe operation of the machine.

A. Sanitize immediately before use.

B. Make sure the Freezing Cylinder Off/On switch

is in the OFF position.

C. Fill the storage containers in the cab with at least

2.5 gallons of mix.

D. Attach the mix inlet probes to the container and

place the containers in the refrigerated cab.

E. Place the mix pump switch in the ON position.

F. Place a container under the spigot and open the

spigot to allow the mix to ﬂ ush out about 8 ounces (0.23 liters) of sanitizing solution and liquid mix. Close the spigot.

G. Open the air bleed valve on the front door by

pressing and holding. Hold the valve open until the mix level in the freezing cylinder is 1/2” from the air bleed valve.

H. Place the Freezing Cylinder OFF/ON switch in

the ON position. Make sure the blender power plug is connected to the machine and place the Blender Power Off/On switch in the ON position.

WARNING

Hazardous Moving Parts

Blender shaft and agitator can grab and cause injury. Do not operate blender without protective shield or swing splash shield.

I. Press the PUSH TO FREEZE button.

NOTE

After the drive motor starts, there is a 3-second delay before the compressor starts.

J. When the product is at 75% consistency, the

display will read “SERVE”.

K. For normal dispensing, move the spigot handle

fully open (Fig. 3-9).

L. On SU412 model, push the spigot handle to the

right to activate the blender. The blender will operate during or after dispensing product.

M. Do not operate the machine when the MIX LOW

message is displayed. Reﬁ ll the mix container immediately.

NOTE

The machine has a standby and sleep mode. After a preset number of freezing cycles, it will enter the standby mode (followed by sleep mode) and remain there until someone draws product or presses the PUSH TO FREEZE button. In the sleep mode, the machine will keep the product below 45°F (7.2°C). Sleep modes do not take the place of cleaning and sanitizing. Federal, State, and local regulatory agencies determine frequency of cleaning and sanitizing.

3.11 MIX INFORMATION

Mix can vary considerably from one manufacturer to another. Differences in the amount of butterfat content and quantity and quality of other ingredients have a direct bearing on the ﬁ nished frozen product. A change in machine performance that cannot be explained by a technical problem may be related to the mix.

Proper product serving temperature varies from one manufacturer’s mix to another. Mixes should provide a satisfactory product in the 20°F to 24°F range. Diet and low-carb mixes typically freeze to proper consistency at higher temperatures.

When checking the temperature, stir the thermometer in the frozen product to get an accurate reading.

Old mix, or mix that has been stored at too high a temperature, can result in a ﬁ nished product that is unsatisfactory. To retard bacteria growth in dairy based mixes, the best storage temperature range is between 33° to 38°F (0.5° to 3.3° C).

3.12 OPERATION OF MIX PUMP

The mix pump switch is located at the front of the machine. When a pump switch is placed in the ON position, the mix pump motor will start pumping mix into the freezing cylinder. When the set pressure is reached, the mix pump will shut off automatically. When the switch is placed in the OFF position, the mix pump will not operate.

NOTE

The mix pump motor is equipped with an internal overload that will “trip”, disabling the pump when the motor is overloaded. Consult the trouble shooting section for corrective information. The internal overload will automatically reset after cooling. If the condition continues, contact a qualiﬁ ed service person.

Figure 3-9 Dispensing Product

Air Line

Mix

Intake

Figure 3-10 Mix Pump Hose Routing

Air/Mix to

Freezing Cylinder

3-way

Tee

Mix

Discharge

A. Place the Main Power OFF/ON and Freezing

Cylinder OFF/ON switches in the ON position and press the CLEAN button. Allow the auger to agitate for 5 to 10 minutes.

B. Remove the suction tube from the mix container.

Open the spigot to remove the mix remaining in the freezing cylinder.

C. Pump 2 gallons (7.5 liters) of potable water through

machine until the water comming out of the spigot is clear.

D. Pump 2 gallons (7.5 liters) of 90° to 110°F (32°C

to 43°C) detergent solution through the machine. The use of soft water is recommended, along with dishwashing detergents such as “Joy,” “Dawn,” or equivalent.

E. Place the mix pump switch in the OFF position.

Open the spigot to relieve the remaining pressure.

F. Press the CLEAN button to stop the auger and

place the Main Power OFF/ON and Freezing Cylinder OFF/ON switches in the OFF position.

A. Mix Operation: The peristaltic mix pump contains

one continuous mix pump hose. When looking at the face of the peristaltic mix pump, the left side of the hose is the mix intake or pickup. The right side of the hose is the mix discharge. Mix is drawn up the pickup side of the hose and transferred through the discharge side to the machine (Fig. 3-10).

B. Air Operation: The air compressor operates

whenever the peristaltic mix pump is running. Air enters through a check valve on the piston downstroke. The air is discharged through a second check valve, on the piston upstroke. The air and mix join at the tee and then travel to the machine.

C. The overrun adjustment is preset at the factory.

If an adjustment becomes necessary, refer to Section 4.

3.13 MIX PUMP CLEANING

NOTICE

Any cleaning procedure must always be followed by sanitizing before ﬁ lling machine with mix. (Refer to section 3.3)

The mix pump is approved for CIP (clean in place). It is thoroughly cleaned when the detergent solution is pumped through the machine. We recommend completely disassembling the pump and disconnecting tubing every 14 days for inspection of parts to conﬁ rm the CIP has been properly performed. If any residue is detected, clean or replace those parts as outlined below.

3.14 DISASSEMBLY AND INSPECTION OF

REMOVABLE PARTS

Inspection of removable parts should be made whenever maintenance is performed or when the pump requires disassembly.

NOTE

If the mix line or air line is difﬁ cult to remove, soften the tubing with a rag soaked in hot water. Hose connections may be sprayed with Haynes Sanitary Lubricant for ease of removal.

WARNING

Hazardous Moving Parts

Revolving pump head can grab, mangle, and cause serious crushing injury. The Main Power Off/ On switch must be placed in the OFF position for cleaning and power must be disconnected when disassembling or servicing.

CAUTION

System Under Pressure

Never disconnect hoses from the machine or the pump without ﬁ rst opening the spigot to relieve pressure.

Figure 3-11 Mix Pump Removable Parts

A. Loosen the clamp and remove the air hose from

the pump compressor.

B. Loosen the clamp and disconnect the mix pump

hose. Remove the pickup hose, the mix check valve and the pickup hose adapter (and bag adapter if applicable) as an assembly from the mix container.

C. Completely disassemble the hose assembly and

the check valve (Fig. 3-11). Place hoses, tee, check valve assembly, and pickup hose adapter in 90° to 110°F (32°C to 43°C) mild detergent water and wash thoroughly. Use soft bristle brushes to clean inside of ﬁ ttings. Rinse all parts in clean 90° to 110°F (32°C to 43°C) water.

D. Carefully inspect each part for wear or damage.

Replace worn or damaged parts.

E. Wash the feed tube and the air tube in the cabinet

with 90° to 110°F detergent water and brushes provided. Rinse with clean, 90° to 110°F water.

F. Prepare two gallons (7.5 liters) of sanitizing

solution using a USDA certiﬁ ed grade sanitizing solution. Sanitize all removed parts. Allow them to air dry.

G. Check the Hose Service Record decal to determine

if a hose reposition or a hose replacement is required.

H. Reassemble both hose assemblies per the

diagram located on the inside of the cab door. Reconnect the assemblies to the pump hose and the discharge hose, using the clamps. (Refer to Section 2.5 Mix Pump).

I. Sanitize assembled machine as per instructions

outlined in Section 3.9.

SECTION 4

MAINTENANCE AND ADJUSTMENTS

4.1 FREEZER ADJUSTMENT

This section is intended to provide maintenance personnel with a general understanding of the freezer adjustments. It is recommended that any adjustments in this section be made by a qualiﬁ ed person.

4.2 PRODUCT CONSISTENCY ADJUSTMENT

The operator can adjust product consistency by modifying the Fine Adjustment setting on the membrane switch. This is the only adjustment that can be made by the operator without using a pass code key sequence. Product consistency ﬁ ne adjustment allows a 0.4 amp maximum adjustment to the drive motor amp draw cutout. Increasing this setting will increase the drive motor amperage cutout and increase product consistency. Follow the instructions below to make ﬁ ne adjustments to product consistency.

A. Place the Main Freezer Power switch in the ON

position.

B. Press the SET button on the Control Panel once.

Fine Adj will appear on the LCD screen.

C. Press the up arrow button until the desired

consistency setting is displayed. The higher the number, the ﬁ rmer the product consistency. The control may be set from 1 to 9. The value increases by 1 each time the up arrow button is pressed. After the value reaches 9, numbering restarts at

0. The 0 setting cannot be set.

D. Press the SET button once to save the setting

and return to the current mode display.

4.3 LOCKING THE CONTROL PANEL

The IntelliTec control has a tamper proof mode to prevent unauthorized use. When set, all buttons on the control panel are disabled. Follow the instructions below to lock the control panel

A. Press and hold the PUSH TO FREEZE button

for at least 5 seconds.

B. While still holding the PUSH TO FREEZE button,

press the CLEAN button once.

C. Release both buttons. An asterisk (*) will appear

on the bottom line of the display, indicating that the control is in the lock out mode.

NOTE:

Repeat steps A, B, and C to unlock the control panel.

4.4 OBTAINING READINGS AND

MODIFYING SETTINGS (SERVICE PERSONNEL ONLY)

Readings and settings on the IntelliTec control are accessed through the IntelliTec control menu settings. Locating freezer readings and system function settings are done using the up arrow () and left arrow () buttons on the membrane switch. A printed IntelliTec Menu Settings sheet is located in the information pouch behind the header panel.

IntelliTec Control Readings

To obtain freezer readings, locate the value on the freezer’s menu settings sheet and follow the steps below.

A. Press and hold the SEL button for 8 seconds. While

still holding the SEL button, press the up arrow button (). The LCD screen will read DISPLAY.

B. Release both buttons. C. Press the up arrow button () to navigate to the

correct reading under DISPLAY or press the left arrow () button to navigate to the ERRCODES menu.

D. Press the up arrow () and left arrow () buttons

to navigate through the rest of the readings as needed.

E. When all readings have been obtained, press

the up arrow button () from ExitMenu to return to the current mode display.

Modifying Control Settings

To change the value of a system function, locate the function on the IntelliTec Settings Menu and follow the steps below.

Figure 4-1 Membrane Switch

IMPORTANT:

Before making changes to any settings, record the original values. If the setting changes do not achieve desired results, return settings to their original values.

A. Press and hold the SEL button for 8 seconds. While

still holding the SEL button, press the up arrow button (). The LCD Screen will read DISPLAY.

B. Release both buttons. C. Press the left arrow button () to get to the correct

menu (Basic, Advanced, or Storage).

D. Press the up arrow button () to navigate to the

value that needs to be changed.

E. Press the SET button to enter the edit mode. F. Press the up arrow button () to change the

setting.

G. Press the SET button to save the setting and exit

the edit mode.

H. Press the up arrow () and the left arrow ()

buttons to navigate through the rest of the settings as needed.

I. When all changes have been completed, press

the up arrow button () from ExitMenu to return to the current mode display.

4.5 READINGS (SERVICE PERSONNEL ONLY)

The IntelliTec control continuously monitors and records temperatures, voltages, amps, and error code details. Each reading is beneﬁ cial to service personnel when troubleshooting.

DISPLAY READINGS

Following are the readings available under the DISPLAY menu:

Cabinet

The temperature of the cab is constantly monitored

by the IntelliTec control.

Cycles (count)

This reading counts down the number of cycles

in the current “Serve Mode”. The starting value is dependent upon the Cycles setting on the IntelliTec control.

°F and amps

Suction line temperature on the freezing cylinder

and drive motor amps are available on the same screen to assist with setup and troubleshooting.

Aux. Temp (°F)

This reading provides the ambient temperature

around the IntelliTec control board.

Supply V (VAC)

A calculated input voltage is recorded.

ERROR CODE READINGS

The following details are recorded under the ERRCODES menu for each of the last 25 error codes received:

Err1 (hours)

A numerical count of the last 25 error codes is

recorded. When the 26th error has occurred, the earliest error code is erased. A timer also begins when an error occurs. The timer records the number of hours since the error occurred. If power to the freezer is interrupted, the timer will stop until power has been restored.

°F and amps

The suction gas temperature on the freezing

cylinder and the drive motor amps are recorded at the time of the error.

Aux. Temp (°F)

Ambient temperature of the IntelliTec control board

is recorded at the time of the error.

Str (°F)

The storage temperature is recorded at the time

of the error.

VAC and Mode

A calculated input voltage and mode at which

the error occurred are recorded. Following are descriptions of each mode:

Mode Description

0 Start of freezing cycle

1 Compressor and drive motor on

2 Stir Cycle

3 Compressor off

4 “Standby Mode”

5 “Sleep 1 Mode”

6 “Sleep 2 Mode”

7 “Clean Mode”

8 Startup

9 Storage only refrigeration

10 Freezing cycle is shut down

11 Door safety switch triggered

12 High pressure cutout

Up Time (hours)

This value is a record of the total time the freezer

has been in service. If power is interrupted, the timer will stop until power is restored. This timer does not reset.

RUN STATISTICS

In addition to dynamic readings and recorded

error code details, the IntelliTec control records rolling averages of run statistics. Following are the readings available under the RUNSTATS menu:

On Times (sec)

The control records the time of each freezing

cycle and provides a rolling average.

Off Times (sec)

The control records the time between freezing

cycles and provides a rolling average.

Brl. Min (°F)

The lowest average barrel temperature is

recorded.

Brl. Max (°F)

The highest average barrel temperature is

recorded.

Stor Min (°F)

The lowest average cabinet temperature is

recorded.

Stor Max (°F)

The highest average cabinet temperature is

recorded.

Power On (hrs)

This value is a record of the time the freezer has

been in service. If power is interrupted, the timer will reset.

4.6 ADJUSTMENTS (SERVICE PERSONNEL ONLY)

The following adjustments directly affect product consistency and length of time in “Serve Mode”. The default settings have been created using a 5% milkfat soft serve mix and provide optimal product consistency while prolonging product life.

CutOut (amps)

It is recommended to set the CutOut value at

initial startup and when changing mix types. Adjustments to this setting directly affect the length of the freezing cycle which changes product consistency. To properly set the CutOut value, refer to section 3-10.

Cut In T (°F)

After the consistency value has been determined,

the Cut In T value can be adjusted. The Cut In T is the temperature of the refrigerant gas in the evaporator at the front of the freezing cylinder. Changing this setting changes the temperature at which the freezing cycle starts. This value along with the CutOut value determines the range of temperatures (or “temperature window”) of the product. Decreasing the temperature decreases the temperature window and, under normal use, increases the amount of freezing cycles. This creates a greater chance of product breakdown by stirring the product often. Increasing the Cut In T increases the temperature window, which decreases freezing cycles and increases the chance of heat shock within the product.

Cycles (count)

This setting determines the number of freezing

cycles during “Serve Mode”. Increasing the value will increase the total time in “Serve Mode”. Factory default is 20 cycles, which results in “Serve Mode” lasting about 2-1/2 hours without the PUSH TO FREEZE button being pressed or a spigot handle being pulled. If the PUSH TO FREEZE button is pressed or the spigot handle is pulled at any time during “Serve Mode”, the Cycles count will reset.

4.7 OTHER SETTINGS (SERVICE

PERSONNEL ONLY)

Changing any setting on the IntelliTec control will alter freezer operation and affect the product temperature, consistency, or life. Refer to the IntelliTec Control System Settings sheet located in the information pouch behind the header panel of the freezer. If any of the following settings on the IntelliTec control differ from the System Settings sheet, it is recommended to return those settings to factory defaults.

Stir On (sec)

Adjustments to this setting affect the amount of

time the auger rotates in the stir cycle. The stir cycle occurs in “Serve Mode”, “Standby Mode”, and “Sleep 2 Mode”.

Stir Off (sec)

Adjustments to this setting affect the time between

stir cycles. The stir cycle occurs in “Serve Mode”, “Standby Mode”, and “Sleep 2 Mode”.

On Time (sec)

Increasing this value will increase the length of

the freezing cycle during “Standby Mode”.

Off Time (sec)

Increasing this value will increase the time between

freezing cycles in “Standby Mode” and result in an increase of product temperature in the barrel.

Stb Time (sec)

This setting determines the total amount of time

in “Standby Mode”.

Sl1DrvOn (sec)

Adjustments to this setting affect the amount of

time the auger rotates in the stir cycle. This stir cycle only occurs in “Sleep 1 Mode”.

Sl1DrOff (sec)

Adjustments to this setting affect the time between

stir cycles. The stir cycle only occurs in “Sleep 1 Mode”.

Sl2CutIn (°F)

Changing this setting affects the temperature at

which the freezing cycle starts in “Sleep 2 Mode”.

Sl2CtOut (°F)

Changing this setting affects the temperature at

which the freezing cycle stops in “Sleep 2 Mode”.

DftOffTm (sec)

In “Serve Mode”, this value determines the

maximum time without a freezing cycle. If this value is met, a freezing cycle will start. In the event of a freezing cylinder temperature sensor failure, this value affects the amount of time between freezing cycles during “Serve Mode”.

Refriger

This setting changes how the control handles

the storage refrigeration cycle. The setting for the SU412 is Cabinet.

CabCutIn (°F)

If the Refriger value is set to Cabinet, this

setting determines the temperature at which the refrigeration cycle starts. If None, 1 Hopper, or 2 Hopper is selected for the Refriger setting, CabCutIn will not be shown on the IntelliTec menu.

CabCtOut (°F)

If the Refriger value is set to Cabinet, this

setting determines the temperature at which the refrigeration cycle stops. If None, 1 Hopper, or 2 Hopper is selected for the Refriger setting, CabCtOut will not be shown on the IntelliTec menu.

Cab Off

If the Refriger value is set to Cabinet and the

temperature sensor in the cabinet fails, this setting determines the time between refrigeration cycles. If None, 1 Hopper, or 2 Hopper is selected for the Refriger setting, Cab Off will not be shown on the IntelliTec menu.

Cab On

If the Refriger value is set to Cabinet and the

temperature sensor in the cabinet fails, this setting determines the length of the refrigeration cycle. If None, 1 Hopper, or 2 Hopper is selected for the Refriger setting, Cab On will not be shown on the IntelliTec menu.

4.8 OVERRUN ADJUSTMENT

The product, when served, is a combination of air and mix. Overrun is a measure of the amount of air blended into the mix.

Overrun can be expressed in terms of the amount of weight loss for a given volume. For example, if a pint of liquid mix weighs 18 ounces and a pint of frozen product with air added weighs 12 ounces, the overrun is said to be 50 percent: 18 oz. - 12 oz. = 6 oz., (6/12) x 100 = 50%

The overrun can be checked by placing a one pint container on an ice cream scale and zeroing out the scale. Then ﬁ ll a one pint container with frozen product. The container should be ﬁ lled over the top and leveled with a straightedge. The product should not contain any air pockets. When weighed on an ice cream scale, one pint of product should weigh 12 to 13 ounces.

The mix pump has been preset at the factory to produce a product with approximately 40% overrun. Because of differences in mix formulation, temperatures and barometric pressure, this ﬁ gure may vary. It will be necessary for approximately 2 gallons of mix to be pumped through the freezer before overrun changes in the product are noticeable.

Overrun is controlled by the length of the air compressor piston stroke within the piston cylinder. Lengthening the stroke within the cylinder will increase overrun. Conversely, shortening the stroke will decrease overrun. To perform an overrun adjustment, refer to the following procedure:

WARNING

Hazardous voltage

The Main Freezer Power switch must be placed in the OFF position when disassembling for servicing. The freezer must be disconnected from electrical supply before removing any access panel. Failure to disconnect power before servicing could result in death or serious injury.

A. Turn the mix pump switch to the OFF position.

Disconnect power sources/circuit breakers.

B. Remove the back panel from the freezer.

C. On the air compressor side of the pump, locate

the long/slender piston rocking arm. The rocking arm downward travel is limited by a stationery cam. On the face of the cam there is an overrun setting indicator plate numbered 3 through 8 and an adjustment knob (Fig. 4-2).

Overrun

Adjustment

Knob

Figure 4-2 Overrun Adjustment

D. The overrun setting is indicated by a pin.

E. To adjust overrun, loosen the allen-head screw

(located within the center of the adjustment knob) with the 5/32” allen wrench provided. Rotate the adjustment knob counterclockwise to a higher number for higher overrun, or clockwise to a lower number for lower overrun. Each number multiplied by 10 represents the overrun percentage (i.e. setting 4 = 40% overrun).

F. Tighten the allen screw, then place the wrench

back in its clip. Replace the lower back panel and secure with the four screws. Turn the mix pump power switch to the ON position.

4.9 MIX PUMP HOSE REPOSITION

Mix pump hose must be repositioned every 800 gallons of mix pumped or every 2 weeks. Failure to reposition the hose will result in reduced mix pump liquid capacity, dispense stoppage, popping, and possible mix pump hose leakage. Follow the steps below to reposition the hose:

A. Run cleaning solution through pump.

B. Turn the pump off and relieve any pressure by

opening the spigot.

C. Grasp the pickup hose end of the mix pump hose

with one hand and turn the pump on. Pull down on the pickup hose end until 12 to 14 inches of tubing has fed through the pump then turn the pump off (Fig. 4-3).

12” to 14”

Pickup

End

Figure 4-3 Pump Hose Reposition

D. Loosen the small clamp at the pick-up hose

adapter and disconnect the mix pump hose.

E. Cut 7-1/2 inches off the end of the mix pump

hose.

F. Reconnect the mix pump hose to the adapter.

G. Continue normal operation. Mix hose will

automatically reposition itself with the adapter near the black cover.

NOTE

Each hose is long enough for 3 repositions before replacement is required.

4.10 MIX PUMP HOSE REPLACEMENT

Mix pump hose must be replaced when tubing cannot be further repositioned (every four to eight weeks). Failure to comply will result in hose failure and possible pump damage. Follow the steps below to replace the hose:

A. Run cleaning solution through pump.

B. Turn the pump off and relieve any pressure by

opening the spigot.

C. Disconnect the mix pump hose at each end.

D. Grasp the discharge hose end with one hand and

turn the pump on. Pull down on the hose until all of the remaining hose is removed from the pump. Turn pump off.

E. Rotate pump roller assembly so one roller is at

the 6:00 position.

F. Use a brush that ﬁ ts in the opening and clean the

pump roller assembly, ﬁ rst with detergent water and then clear water.

G. Connect the new mix pump hose to the pickup

hose adapter using the small clamp.

H. Feed one end of the mix pump hose into the

pickup hose side (left) of the black cover.

NOTE

Feed the tube into the clamp so the natural curve of the tube is towards the outside of the black cover. This prevents the hose from looping around the black cover twice.

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

begins to feed.

J. Allow the hose to feed itself through the pump

until about 6” (15cm) remains on the entering side.

K. Turn pump off.

L. 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.

M. Turn the pump on.

N. Allow the remaining 6” (15cm) of tubing to feed

through the pump until the hose adapter prevents further feeding.

O. Turn the pump off.

CAUTION

Risk of Product Damage

Air/Mix Tee must remain below the black cover clamp. If the Tee is above the pump, the mix may drain into the air compressor, resulting in pump damage.

D. Press the up arrow button () once to navigate

to the CabCutIn value. Record this value.

IMPORTANT:

Before making changes to any settings, record the original values. If the setting changes do not achieve desired results, return settings to their original values.

E. Press SET button to enter edit mode. F. Press the up arrow button () to increase the

number to the value required. The value increases by 1 each time the up arrow button () is pressed. After the value reaches 9, numbering restarts at

G. Press SET button to save the setting and exit the

edit mode.

H. Press the up arrow button () once to navigate

to the CabCtOut value. Record this value.

I. Press SET button to enter edit mode. J. Press the up arrow button () to increase the

number to the value required. The value increases by 1 each time the up arrow button () is pressed. After the value reaches 9, numbering restarts at

K. Press SET button to save the setting and exit the

edit mode.

L. Press the up arrow () and left arrow () buttons

to navigate to ExitMenu.

M. Press the up arrow button () from ExitMenu to

return to the Mode Screen.

N. Locate the Speciﬁ cation Sheet for SU412 Control

behind the header panel and record the new values on this sheet.

P. Connect the free end of the mix pump hose to the

3-way Tee. When all connections are complete, the 3-way Tee must be lower than the black pump housing.

Q. The pump is now ready to sanitize.

4.11 CAB TEMPERATURE ADJUSTMENT

Cab temperature is monitored and controlled by two settings on the IntelliTec control: CabCutIn and CabCtOut. The cut in value determines the temperature at which the refrigeration cycle starts. The cut out setting determines when the cycle stops. To change the CabCutIn or CabCtOut, follow the steps below:

A. Press and hold SEL button for 8 seconds. While

still holding the SEL button, press the up arrow button (). The LCD Screen will read "Display".

B. Release both buttons. C. Press the left arrow button () three (3) times to

navigate to the Storage menu.

4.12 DRIVE BELT TENSION ADJUSTMENT

To check belt tension, follow the steps below:

A. Remove a side panel and the back panel.

WARNING

Hazardous voltage

B. Use a Burroughs Belt Tension Gauge to set the

tension for the drive belt. Set the belt tension to 15 - 25 lbs.

C. If an adjustment is necessary, loosen the four

motor plate retaining nuts, adjust belt tension then retighten the four nuts.

D. Using a straightedge, check that the drive motor

pulley is aligned with the speed reducer pulley. Align the pulley if necessary.

NOTE

Belt life will be increased if new drive belts are tightened after two or three weeks of operation.

4.13 CONDENSER CLEANING (AIR-COOLED FREEZERS)

The condenser requires periodic cleaning. To clean the condenser, refer to the following steps:

A. Lift the condenser ﬁ lter off of the freezer cover

panel. Visually inspect the condenser ﬁ lter for dirt (Fig. 4-4).

Figure 4-4 Removing Condenser Filter

B. If the condenser ﬁ lter is dirty, vacuum or brush

it clean. Rinse it with clean water and allow it to dry before replacing it on the freezer.

NOTE

If the condenser is not kept clean, refrigeration efﬁ ciency will be lost.

4.14 PREVENTATIVE MAINTENANCE

It is recommended that a preventative maintenance schedule be followed to keep the freezer clean and operating properly. The following steps are suggested as a preventative maintenance guide.

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

A. Daily checks

Check for any unusual noise or condition and

repair immediately.

B. Monthly checks

1. Check drive belts for wear and tighten belts if necessary. (Refer to section 4.12)

2. Check the condenser ﬁ lter for dirt. (Refer to section 4.13).

4.15 EXTENDED STORAGE

Refer to the following steps for winterizing the freezer or for storing the freezer over any long period.

A. Clean all of the parts that come in contact with

mix thoroughly with warm detergent . Rinse in clear water and dry all parts. Do not sanitize.

NOTE

Do not let cleaning solution stand in freezer barrel or mix pump during the shutdown period.

B. Remove, disassemble, and clean the front door,

auger shaft, and mix pump. Leave disassembled during the shutdown period.

C. Place the plastic scraper blade in a plastic bag

with a moist paper towel. This will prevent the ﬂ ights from becoming brittle if exposed to dry air over an extended period (over 30 days).

D. For water-cooled freezers that are left in unheated

buildings, or buildings subject to freezing, the water must be shut off and disconnected. Disconnect the ﬁ ttings at the water inlet and the water outlet lines of the freezer. The ﬁ ttings are located at the rear of the freezer. Run the compressor for 2 - 3 minutes to open the water valve. Blow out all the water, ﬁ rst through the water inlet, then through the water outlet lines with air or carbon dioxide. Drain the water supply line coming to the freezer.

E. Place the Pump OFF/ON switch and the Main

Freezer Power OFF/ON switch in the OFF position.

F. Disconnect the freezer from the source of the

electrical supply in the building.

SECTION 5

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REFRIGERATION SYSTEM

5.1 REFRIGERATION SYSTEM

The U412 refrigeration system has two functions:

Medium-Temperature - Maintaining product

temperature in the cab unit and providing refrigeration to the mix transfer line.

Low-Temperature - Producing and maintaining

high quality shake in the freezing cylinder.

The system is designed for efﬁ cient use with R404A refrigerant. The proper charge is indicated on the information plate.

5.2 REFRIGERANT RECOVERY AND EVACUATION

Refer to the following procedures to properly recover and evacuate the refrigeration system. Do not purge refrigerant into the atmosphere.

NOTE

For qualiﬁ ed service personnel only. Anybody work- ing with refrigerants must be certiﬁ ed as a T echni- cian TYPE I as required by 40 CFR 82 Subpart F and hold all State and/or local refrigerant handling certiﬁ cations. In addition, all handling, storage, and disposal of refrigerants must be in accordance with Environmental Protection Agency (EP A) guidelines and standards and all State and local guidelines and standards.

WARNING

Hazardous voltage

The Main Freezer Power switch must be placed in the OFF position when disassembling for servicing. The machine must be disconnected from electrical supply before removing any access panel. Failure to disconnect power before servicing could result in death or serious injury.

Figure 5-1 Water Cooler Refrigeration System

A. Refrigerant Recovery

1. Disconnect the machine from the electrical supply before removing any panels for servicing.

2. Remove all panels.

3. Connect the recovery unit to the suction and discharge service valves of the compressor.

4. Locate the compressor contactor behind the header panel and disconnect the brown wire #65.

5. Wrap electrical tape around the wire to insulate it.

6. Remove the belt from the pulley to allow the drive motor to spin freely.

7. Connect power to the machine.

8. Turn the Main Power OFF/ON switch and Freezing Cylinder OFF/ON switch to the ON position.

CAUTION

The solenoid valves must be energized to allow all refrigerant to be recovered and to prevent injury when brazing.

9. Press the Push To Freeze button on the IntelliTec control. This will energize the solenoid valves.

10. Operate the recovery unit per manufacturer’s instructions

NOTE

If recovery is not completed after 20 minutes, press the Push T o Freeze button again. This will keep the solenoid valves open.

B. Evacuating the Refrigeration System

1. Close any open ports in the refrigeration system.

2. Connect a vacuum gauge to one of the access ﬁ ttings next to an evaporator.

3. Connect the evacuation unit to the suction and discharge service valves of the compressor.

4. Locate the compressor contactor behind the header panel and disconnect the brown wire #65.

5. Wrap electrical tape around wire to insulate it.

6. Remove belts from the pulleys to allow drive motors to spin freely.

7. Connect power to the machine.

8. Turn the Main Power OFF/ON switch and Freezing Cylinder OFF/ON switches to the ON position.

9. Press the Push To Freeze button on the IntelliTec control. This will energize the solenoid valves.

10. Evacuate the system until the gauge reads 300 microns of mercury (300μ Hg) for 5 continuous minutes.

NOTE

If evacuation is not completed after 20 minutes, press the Push To Freeze button again. This will keep the solenoid valves open.

11. If the system will not maintain a standing vacuum test with the vacuum pump off (gauge increases towards atmosphere), ﬁ nd the leak, ﬁ x it, and evacuate again.

5.3 REFRIGERANT CHARGING

Refer to the following procedures to properly charge the refrigeration system. Stoelting recommends liquid refrigerant charging.

NOTE

A. Ensure the electrical supply has been removed

before continuing.

WARNING

Hazardous voltage

B. If the system has been opened or if there was a

leak, refer to Section 5.2 - Refrigerant Recovery and Evacuation to evacuate the system prior to charging.

C. Refer to machine’s information plate for total

charge requirements.

NOTE

The refrigeration system of the U412 is critically charged. Be sure to charge the system to the weight listed on the machine’s information plate.

D. For liquid refrigerant charging, connect refrigerant

cylinder to the discharge access ﬁ tting of the compressor.

E. Energize the three solenoid valves. There are two

liquid line solenoids and one suction line solenoid.

F. Add the proper amount of refrigerant according

to the machine’s information plate.

5.4 COMPRESSOR

The U412 has a scroll type compressor (Refer to Figure 5-2). This compressor type uses two spiral shaped scrolls to compress gas. One scroll rotates around an identical stationary scroll. Gas is drawn into the compression chamber by the rotating scroll and is compressed as it moves towards the center of the chamber. Operation of this compressor is continuous because, during each rotation, several gas ‘pockets’ are compressed simultaneously.

Details of the compressor’s starting components are in Section 6.

Figure 5-2 Scroll Type Compressor

A. Winding Test

To test the compressor motor windings for possible problems, perform the following steps:

A. Disconnect the machine from electrical supply

before removing any panels for servicing.

B. Remove the left side panel.

C. Pull the compressor connector plug off of the

compressor. The compressor has three terminals; C (common), R (run), and S (start). (Refer to Figure 5-3)

D. Connect an ohmmeter to the C and R terminals.

Resistance through the run winding should be

1.81Ω ±10%.

E. Connect ohmmeter to terminals C and S.

Resistance through the start winding should be

2.27Ω ±10%.

F. To check if windings are shorted to ground, connect

one ohmmeter lead to a bare metal part on the compressor (such as any copper line leading to or from the compressor) and check terminals C, R, and S.

NOTE

The compressor is equipped with an internal overload protector. If the compressor is warm and ohmmeter readings indicate an open winding, allow up to one hour for overload to reset.

B. Compressor Removal

A. Disconnect the machine from electrical supply

before removing any panels for servicing.

B. Disconnect the electrical plug from the compressor.

C. Recover refrigerant charge per the instructions

in Section 5.2.

D. Leave the suction and discharge ports open to

prevent pressure buildup during compressor removal.

E. Remove six inches of insulating tubing on

the suction line going to the compressor and unsweat the suction and discharge line from the compressor.

F. Remove the four nuts and washers from the base

of the compressor.

G. Remove the compressor through the side of the

machine.

H. Remove the four rubber compressor mounts from

the compressor.

I. Crimp and braze all open ports of the old

compressor.

NOTE

A compressor returned to Stoelting with any open ports will void the warranty. ALWAYS crimp and braze ports on a compressor that has been removed.

C. COMPRESSOR INSTALLATION

A. Disconnect the machine from electrical supply

before removing any panels for servicing.

B. Install the four rubber mounts on the compressor.

Figure 5-3 Compressor Connection

WARNING

Hazardous voltage

C. Install the compressor into the machine, ﬁ tting

the base over the four bolt holes.

D. Install the four washers and nuts onto the bolts

and tighten securely.

E. Remove all tubing plugs from the replacement

compressor.

NOTE

The compressor plugs protect the compressor from moisture in the air. Do not remove the plugs until you are ready to install. The compressor must not be opened to the atmosphere for more than 10 minutes.

F. Leave the suction and discharge ports open to

prevent pressure buildup. Braze the suction and discharge line to the compressor.

G. Connect the electrical plug to the compressor.

The plug is keyed and will only install one way. (Refer to Figure 5-3)

H. Replace the drier per the instructions in Section

5.9.

I. Evacuate the system per the instructions in Section

5.2

J. Recharge the system per the instructions in

Section 5.3.

K. Replace the insulating tubing on the suction line.

5.5 CONDENSER

The U412 is available with a water-cooled or an air-cooled condenser. The capacity of the machine is directly related to keeping the condenser clean and free of debris.

The water-cooled condenser is a tube and shell type. This condenser requires cool, clean water to function properly. Inlet and discharge lines must be 3/8” ID minimum.

The air-cooled condenser is a copper tube and aluminum ﬁ n type. The machine must have a minimum of 3” of clearance on the sides and 6” clearance at the back for proper air ﬂ ow.

Condenser Testing

The condenser can be checked for leaks using the bubble test or using a leak detector.

5.6 EVAPORATOR

The U412 has a freezing cylinder evaporator, a cab evaporator, and a mix line evaporator.

Evaporator Testing

The evaporator can be checked for leaks using the bubble test or using a leak detector.

NOTE

Foam insulation in the evaporator will set off electronic leak detectors if disturbed.

5.7 VALVES

A. Thermostatic Expansion Valve (TXV)

The Thermostatic Expansion Valve (TXV) is used to meter the refrigerant to the evaporator. It does so by maintaining a low, constant superheat in the evaporator. The self-regulating TXV is preset by the manufacturer and adjustment is not recommended. Figure 5-4.

Figure 5-4 TXV

TXV Testing & Adjustment

When testing a TXV, run only the evaporator that the TXV meters. If checking the cab TXV, place the freezing cylinder switch in the OFF position.

NOTE

The bulb has an indent which must be positioned against the tubing. Good contact between the bulb and the suction line is necessary for proper operation of the valve. The bulb must also be well insulated.

A. Connect a gauge to the access ﬁ tting on the

suction line next to the evaporator.

B. Connect a thermocouple to the suction line next

to the evaporator.

C. Immediately before the refrigeration cycle ends,

the gauge should read between 20-22 psig.

D. If the pressure reading is higher than expected,

check to see if there is an overcharge of refrigerant.

E. If the pressure reading is lower than expected,

check to see if there is a low refrigerant charge or if there is a restriction in the system.

NOTE

The TXV is the LAST component to adjust in the refrigeration system.

F. The TXV can be adjusted after the steps above are

completed. When adjusting, do not turn the valve over 1/4 turn (90°). Turn the valve stem clockwise to increase the superheat or counterclockwise to decrease the superheat.

TXV Removal

A. Remove the side panel.

B. Remove bulb from suction line exiting from the

evaporator.

C. Recover refrigerant charge per instructions in

Section 5.2.

D. Leave the suction and discharge ports open to

prevent pressure buildup during TXV removal.

E. Remove any insulation from the TXV and

immediate surrounding lines.

F. Apply a heat sink (wet cloth) to the valve dome

(Figure 5-5).

G. Unsweat the TXV and remove.

D. Install bulb on suction line exiting the evaporator

using existing clamp. The bulb has an indent that must be placed against the tubing.

NOTE

Good contact between the bulb and the suction line is necessary for proper operation of the valve. The bulb must also be well insulated.

E. Tighten clamp to 20 in/lb using a torque wrench.

F. Replace insulation to the TXV and surrounding

lines.

G. Replace the drier per the instructions in Section

5.9.

H. Evacuate the system per the instructions in Section

5.2.

I. Recharge the system per the instructions in

Section 5.3.

B. Check Valve

The U412 has 2 magnetic check valves (Refer to Figure 5-6). Each valve is positioned in the suction line and prevents backﬂ ow of refrigerant into the evaporator. If there is reversed ﬂ ow, the product in the freezing cylinder softens and liquid refrigerant can ﬂ ood into the compres- sor on startup.

If a check valve needs to be replaced, use a heat sink (wet cloth) when installing the new valve to prevent damage.

Figure 5-5 TXV Removal

TXV Replacement

To replace the TXV, perform the following procedures:

A. Position the TXV with a heat sink into the system.

B. With the suction and discharge ports open, braze

the TXV into the system using appropriate brazing material.

C. Remove the heat sink from the TXV.

Figure 5-6 Check Valve

C. High Pressure Cutout

The high pressure cutout stops the compressor if the discharge pressure reaches 445 psig.

High Pressure Cutout Test

A. Connect a gauge to the access ﬁ tting on the

discharge line.

B. Disconnect cooling:

Air-Cooled - Disconnect evaporator fan

Water-Cooled - Shut off water supply

C. High pressure cutout should trip when pressure

reaches 445 psig ±9.

High Pressure Cutout Removal

A. Remove the left side panel.

B. Recover refrigerant charge per instructions in

Section 5.2.

C. Leave the suction and discharge ports open to

prevent pressure buildup during removal.

D. Unsweat the high pressure cutout from the suction

line.

E. Disconnect the terminals from high pressure

cutout.

High Pressure Cutout Replacement

A. With the suction and discharge ports open, braze

the capillary tube to the discharge line.

C. Replace the drier per the instructions in Section

5.9.

D. Braze bulb into place on suction line.

E. Evacuate the system per the instructions in Section

5.2.

F. Recharge the system per the instructions in

Section 5.3.

G. Connect the pink wire to the COM terminal and

the brown/gray wires to the #2 terminal.

H. Attach the high pressure cutout to the top of the

inside of the header panel using the two screws with star washers.

D. Hot Gas Bypass

The hot gas bypass valve is installed in parallel to the compressor and helps to regulate the compressor temperature (Refer to Figure 5-7). When the cab evaporator is the only part of the system requiring refrigerant, the bypass valve will allow discharge gas to bypass into the suction line to prevent liquid refrigerant from entering the compressor.

Hot Gas Bypass Adjustment

NOTE

Before adjusting the hot gas bypass, check the EPR valve and adjust if necessary.

A. Turn the Main Power OFF/ON switch and the

Freezing Cylinder OFF/ON switch in the OFF position.

B. Connect a gauge to the access ﬁ tting on the

suction line next to the compressor.

Figure 5-7 Hot Gas Bypass

C. Open the cab door and place a piece of tape on

the cab door interlock switch.

NOTE

The cab door remains open for this test. The relatively warm ambient air will keep the cab refrigeration running.

D. Turn the Main Power OFF/ON switch to the ON

position.

E. Wait 3 minutes to allow the gauge to stop moving.

F. Unscrew the seal cap from the top of the valve.

G Using a 5/16” Allen wrench, adjust the valve

counterclockwise to decrease pressure and clockwise to increase pressure. (Refer to Figure 5-8)

NOTE

Each 360° turn will change the pressure about 6 psig.

H. Adjust the hot gas bypass valve to 18 psig ±1.

Figure 5-8 Hot Gas Bypass Adjustment

I. Wait 2 minutes to ensure pressure remains stable.

J. Hand-tighten seal cap to valve.

Hot Gas Bypass Removal

A. Remove the side and rear panels.

B. Recover refrigerant charge per instructions in

Section 5.2.

C. Remove insulation around hot gas bypass and

tubing.

D. Leave the suction and discharge ports open to

prevent pressure buildup during hot gas bypass removal.

E. Apply a heat sink (wet cloth) to the hot gas bypass.

F. Unsweat the hot gas bypass and remove.

Hot Gas Bypass Replacement

To replace the hot gas bypass, perform the following procedures:

A. Apply a heat sink (wet cloth) to the hot gas bypass.

B. With an open port, braze the hot gas bypass into

the system using appropriate brazing material.

C. Remove the heat sink from the hot gas bypass.

D. Replace the ﬁ lter drier. Refer to Section 5.8 for

details.

E. Evacuate and recharge system per instructions

in Section 5.2.

E. Evaporator Pressure Regulator (EPR)

There is one EPR in the U412 refrigeration system (Refer to Figure 5-9). It is located on the suction line of the refrigerated mix line and regulates evaporator refrigerant pressure.

Figure 5-9 EPR Valve

D. Open the cab door and place a piece of tape on

the cab door interlock switch.

NOTE

The cab door remains open for this test. The relatively warm ambient air will keep the cab refrigeration running.

E. If the gauge does not read 78 ±2 then adjustment

is needed.

F. Remove the plastic cap and loosen the locknut

on the EPR. Using a small screwdriver, turn the adjustment screw counterclockwise 1/2 turn, then adjust as necessary. Turn the valve stem clockwise for higher pressure or counterclockwise for lower pressure.

G. Allow the system to stabilize for 5 minutes to

ensure pressure remains stable.

EPR Removal

A. Remove the side panel.

B. Recover refrigerant charge per instructions in

Section 5.2.

C. Leave the suction and discharge ports open to

prevent pressure buildup during EPR removal.

D. Unsweat the EPR and remove.

EPR Replacement

To replace the EPR, perform the following procedures:

A. Apply a heat sink (wet cloth) to the EPR.

B. With an open port, braze the hot gas bypass into

the system using appropriate brazing material.

C. Remove the heat sink from the hot gas bypass.

D. Replace the ﬁ lter drier. Refer to Section 5.8 for

details.

E. Evacuate and recharge system per instructions

in Section 5.2.

F. Water Valve (Water Cooled Models Only)

The water valve monitors refrigerant pressure and opens on an increase of pressure. The opening point pressure is the refrigerant pressure required to lift the valve disc off the valve seat. (Figure 5-10)

EPR Test and Adjustment

A. Place the Main Power OFF/ON switch and both

Freezing Cylinder OFF/ON switches in the OFF position.

B. Connect a gauge to the access ﬁ tting on the

suction line between the mix line evaporator and the EPR.

C. Place the Main Power OFF/ON switch to the ON

position and place the Freezing Cylinder OFF/ON switch to the OFF position

Figure 5-10 Water Valve

Water Valve Adjustment

A. Remove the back panel.

B. Connect a gauge to the compressor discharge

access ﬁ tting.

C. Connect the machine to the electrical supply, start

the refrigeration cycle, and read the pressure.

D. The proper gauge reading should be 225-235 psig.

The exit water temperature should be 95-107°F.

E. If the water temperature and high side pressure

are too low, the opening point pressure should be increased to slow the water ﬂ ow. Turn the adjustment screw counterclockwise.

F. If the water temperature and high side pressure

are too high, the opening point pressure should be decreased to increase the ﬂ ow of water. Turn the adjustment screw clockwise.

Water Valve Removal

The water valve is connected to the refrigeration system by capillary tube brazed to the discharge line.

A. Turn off and disconnect the water supply. Blow

out the water lines with compressed air or CO2.

B. Recover refrigerant charge per instructions in

Section 5.2.

C. Leave the suction and discharge ports open

to prevent pressure buildup during water valve removal.

D. Unsweat the capillary tube from the discharge

line.

E. Remove the clamps from the water lines at the

valve.

F. Remove the two screws holding the water valve

to the frame and remove the valve.

Water Valve Replacement

To replace the water valve, perform the following procedures:

A. Position the water valve and attach to the frame

using the two screws.

B. Install the water lines onto the valve with hose

clamps.

C. Leave the suction and discharge ports open

to prevent pressure buildup during water valve installation.

D. Braze the capillary tube into the system using

appropriate brazing material.

E. Connect the water supply line and turn on the

water supply.

F. Check for leaks in the water lines. If there are no

leaks, turn off the water supply.

G. Replace the ﬁ lter drier. Refer to Section 5.8 for

details.

H. Evacuate and recharge system per instructions

in Section 5.2.

I. Turn on the water and check for leaks in the water

lines with the refrigeration system running.

J. Adjust the valve as necessary.

5.8 SOLENOID

Solenoid valves are installed on the liquid and suction line of the freezing cylinder evaporator and on the liquid line of the cab evaporator (Refer to Figure 5-11). A solenoid valve has a magnetic coil that, when energized, lifts a plunger and allows refrigerant to ﬂ ow. The solenoids are activated by the IntelliTec control and determine which evaporator receives refrigeration.

The suction line solenoid prevents refrigerant ﬂ ow in the evaporator when the suction pressure drops due to the operation of the other evaporators in the system.

Figure 5-11 Solenoid Valve

Activating Solenoid Valves

To open the solenoids, follow these steps:

A. Turn the Main Power OFF/ON switch and both

Freezing Cylinder OFF/ON switches to the OFF position.

B. Locate the compressor contactor behind the

header panel and disconnect the brown wire #65.

C. Wrap electrical tape around wire to insulate it.

D. Remove belts from the pulley to allow drive motor

to spin freely.

E. Connect power to the machine.

F. Turn the Main Power OFF/ON switch and the

Freezing Cylinder OFF/ON switch to the ON position.

G. Press the Push To Freeze button the IntelliTec

control. This will energize the solenoid valves.

Solenoid Testing

When activated, a solenoid coil produces a magnetic ﬁ eld. This ﬁ eld can be detected by placing the tip of a metal screwdriver close to the retaining screw on the solenoid coil. The retaining screw will act like a magnet and pull on the screwdriver tip. Additionally, the solenoid will make a clicking sound when ﬁ rst activated.

Solenoid Magnetic Coil Removal

A. Remove the side panel.

B. Disconnect the electrical wires.

C. Remove the retaining screw from the top of the

solenoid and pull the magnetic coil off.

Solenoid Magnetic Coil Installation

To replace the magnetic coil, perform the following procedures:

A. Connect the two electrical wires to the magnetic

coil.

B. Push the coil on to the solenoid valve stem.

C. Make sure there is not any foam insulation between

the valve coil and valve body. Trim any excess insulation.

D. Install the retaining screw onto the top of the coil.

Solenoid Valve Removal

A. Recover refrigerant charge per instructions in

Section 5.2.

B. Remove insulation around valve and attached

refrigeration lines.

C. Apply heat sinks (wet cloth) to the insulated

refrigerant lines near the valve.

D. Leave a port open to prevent pressure buildup

during solenoid removal.

E. Identify and disconnect the two wires from the

solenoid coil.

F. Remove the retainer holding the coil to the solenoid

body and remove the coil.

G. Unsweat the solenoid and remove.

Solenoid Valve Replacement

To replace the solenoid, perform the following procedures:

A. Position the new solenoid with the arrow pointing

toward the direction of ﬂ ow.

B. Apply a heat sink (wet cloth) to the solenoid valve.

C. With the suction and discharge ports open, braze

the solenoid into the system using appropriate brazing material.

D. Remove the heat sink from the valve.

E. Replace insulation around valve.

F. Replace the ﬁ lter drier. Refer to Section 5.8 for

details.

G. Evacuate and recharge system per instructions

in Section 5.2.

5.9 FILTER DRIER

The ﬁ lter drier must be replaced every time the refrigeration system is opened for service. A new ﬁ lter drier improves operation of the entire refrigeration system by stopping the circulation of moisture and by removing harmful contaminants (Refer to Figure 5-12).

Figure 5-12 Filter Drier

Filter Drier Removal

A. Recover refrigerant charge per instructions in

Section 5.2.

B. Cut the refrigeration line as close to the ﬁ lter drier

as possible and remove drier.

C. Cap the ends of the drier using the plugs from

the new drier.

NOTE

The drier must be capped to prevent moisture from the environment

Filter Drier Replacement

A. Position the ﬁ lter drier so the arrow is pointing

towards the evaporators (pointing away from the condenser).

B. Apply a heat sink (wet cloth) to the ﬁ lter drier.

C. With the suction and discharge ports open, braze

the ﬁ lter drier into the system using appropriate brazing material.

D. Evacuate the system per instructions in Section

5.2.

E. Recharge the system per instructions in Section

5.3.

5.10 CAPILLARY TUBE

The capillary tube meters refrigerant ﬂ ow in the mix line evaporator (Refer to Figure 5-13). The amount of ﬂ ow is dependent on the length and ID of the capillary tube as well as the refrigerant charge.

Capillary Tube Removal

A. Recover refrigerant charge per instructions in

Section 5.2.

B. Leave a port open to prevent pressure buildup

during capillary tube removal.

C. Remove foam insulation from the capillary tube

at the evaporator inlet.

D. Unsweat the capillary tube and remove.

Capillary Tube Replacement

A. Position the capillary tube in place.

B. Apply a heat sink (wet cloth) to the capillary tube.

C. With the suction and discharge ports open, braze

the capillary tube into the system using appropriate brazing material.

D.. Replace foam insulation to the capillary tube at

the evaporator inlet.

E. Evacuate the system per instructions in Section

5.2.

F. Recharge the system per instructions in Section

5.3.

5.11 CAB UNIT

The IntelliTec control is programmed to handle refrigeration of the cabinet independently from the barrel. The control maintains cabinet temperature between two preset values (CabCutIn and CabCtOut). 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.

The refrigeration will run for a maximum of 4 minutes. After this time is reached, the refrigeration cycle will stop for a minimum of 3 minutes. At the expiration of 3 minutes, the control will check cabinet temperature. If product temperature is at or above CabCutIn, a refrigeration cycle will start.

To adjust temperature, refer to Section 4-4 Obtaining Readings and Modifying Settings.

Figure 5-13 Capillary Tube

SECTION 6

ELECTRICAL AND MECHANICAL CONTROL SYSTEMS

NOTE

The wiring diagram is available in Section 8.

6.1 INTELLITEC CONTROLLER

The IntelliTec control is Stoelting’s most advanced controller. It combines all of the best features of previous controllers with advanced sensing and troubleshooting capabilities.

Understanding the modes of operation and individual control settings will make servicing the control straightforward.

A. COMPONENTS OF CONTROLLER

The IntelliTec control consists of three main components; the control board (Figure 6-1), the membrane switch (Figure 6-2), and the display panel module (Figure 6-3). The membrane switch is connected to the display panel module via a 9-pin ribbon cable. The display panel module is connected to the IntelliTec control board through a telephone cord. The IntelliTec control board is connected to the machine through an 8-pin connector, a 7-pin connector, and a 6-pin connector.

Figure 6-2 Membrane Switch

6.2 CONTACTORS

The compressor and drive motor contactors are mounted inside the electrical box behind the header panel. There is one contactor for the compressor and a contactor for each drive motor.

The IntelliTec control sends electronic signals to trigger the contactors. Separate signals are used to control each drive motor contactor and the compressor contactor. The signals to the contactors are staggered, so the drive motor will always start and stop three seconds before the compressor. By staggering the starting and stopping of the drive motor, maximum starting torque is available and voltage spikes are reduced.

Figure 6-1 IntelliTec Control Board

Figure 6-3 Display Panel Module

A. CONTACTOR TESTS

The following tests will show if a contactor is working properly.

1. Open header panel and visually check the IntelliTec control board.

2. Check for a signal going to contactor. When the spigot is opened or the Push To Freeze button is pressed, the DRV LED on the control board will light up. After three seconds, the CMP LED will light up (Refer to Figure 6-4). If the LEDs do not light up, refer to Section 7 Troubleshooting.

NOTE

In addition to the LEDs lighting, there will be an audible click from the contactors and the motor and compressor will start.

Protective

Shield

Tension

Adjustment

Nut

CMP LED

DRV LED

Figure 6-4 IntelliTec LEDs

3. Check to ensure contactor is receiving signal. Read voltage across the coils of the contactor during a freezing cycle. Voltage should be about 115V. If there is no voltage reading, refer to Section 7 Troubleshooting.

6.3 DRIVE MOTOR

The drive motor is used to rotate the auger assembly. An internal, normally closed, centrifugal switch starts the drive motor. The motor has an internal thermal overload.

A. DRIVE MOTOR REMOVAL

1. Disconnect machine from electrical supply before removing any panels for servicing.

2. Remove the back panel and the right side panel.

3. Remove the electrical cover plate from the back of the motor.

4. Identify (mark) wires and remove them from the motor.

5. Remove protective shield from side of machine. (Refer to Figure 6-5)

Figure 6-5 Motor Removal

6. Loosen the belt tension adjustment nut and remove the belt. (Refer to Figure 6-5)

7. Remove the motor mounting bolts and shims.

8. Loosen the two allen head screws from the pulley.

9. Remove the pulley and key from the motor shaft.

B. DRIVE MOTOR INSTALLATION

1. Place the drive motor in position and install the four mounting bolts and shims.

2. Place the pulley and key on the motor shaft.

NOTE

Do not tighten the pulley screws until after the belt tension has been properly adjusted.

3. Install the belt and tighten the tension bolt.

4. Use a Burroughs Belt Tension Gauge to set the tension for the drive belt. Set the belt tension to 15 - 25 lbs.

5. Using a straightedge, align the drive motor pulley with the gearbox pulley. Tighten the two allen head screws.

6. Install wiring according to wiring diagram (located behind header panel). Install electrical cover plate.

7. Install protective shield.

8. Install back and side panel.

6.4 CAPACITORS

The compressor start and run contactors are mounted behind the side panels. The start and run capacitors for the drive motor is mounted directly onto the motor body.

Run

Capacitor

Start

Capacitor

Figure 6-6 Compressor Capacitors

A. CAPACITOR TEST

1. Disconnect machine from electrical supply before removing any panels for servicing.

2. Place the Main Power OFF/ON switch and the Freezing Cylinder OFF/ON switch in the OFF position. Remove the right side panel.

3. Remove a lead from one of the capacitor terminals.

WARNING

Hazardous voltage

4. Using insulated pliers, discharge the capacitor by connecting a 20KΩ 5W resistor across the terminals.

NOTE

Discharge the capacitor even if there is a bleeder resistor across the terminals. There may be an open in the bleeder resistor preventing it from working properly.

5. Disconnect the bleeder resistor from the circuit.

6. Check the capacitance across the terminals. Refer to the table below for the correct readings.

Rating

Part MFD VAC

Drive Motor Run 231078 50 MFD 370 VAC

Drive Motor Start 231095 500 MFD 125 VAC

Compressors - Start 230638 88-106 MFD 330 VAC

Compressors - Run 230652 35 MFD 440 VAC

Compressors - Run 231057 35 MFD 370 VAC

B. CAPACITOR REPLACEMENT

1. Disconnect machine from electrical supply before removing any panels for servicing.

2. Place the Main Power OFF/ON switch and the Freezing Cylinder OFF/ON switch in the OFF position.

3. Remove leads from the capacitor terminals.

4. Using insulated pliers, discharge the capacitor by connecting a 20KΩ 5W resistor across the terminals.

NOTE

Discharge the capacitor even if there is a bleeder resistor across the terminals. There may be an open in the bleeder resistor preventing it from working properly.

5. Pull the capacitor out of its holder and replace. Make sure the new capacitor has a bleed resistor.

6. Connect the leads to the terminals.

6.5 GEARBOX

A. GEARBOX INSPECTION

Inspect the gearbox and listen for unusual noise. A grinding sound generally indicates a bad gear.

B. GEARBOX REMOVAL

1. Disconnect the machine from electrical supply before removing any panels for servicing.

2. Remove the front door and remove the auger shaft.

3. Remove the back panel and right side panel.

4. Remove protective shield from the side of the machine.

5. Remove the belt.

7. Remove the pulley by loosening the set screws.

8. Remove the four bolts holding the gearbox to the barrel and mounting bracket.

9. Remove the gear box.

C. GEARBOX INSTALLATION

1. Place the gear box in position and install the four bolts. Make sure the bolts pass through the mounting bracket and gear box.

2. Tighten the bolts.

3. Mount the pulley on the gear box shaft and align it with the motor pulley, then tighten the allen head screws.

4. Install the belt.

5. Use a Burroughs Belt Tension Gauge to set the tension for the drive belt. Set the belt tension to 15-25 lbs.

7. If an adjustment is necessary, loosen the four motor plate retaining nuts, adjust belt tension then retighten the four nuts.

8. Install the auger shaft and front door.

6.6 CONDENSER FAN MOTOR (AIR-

COOLED ONLY)

A. FAN MOTOR REPLACEMENT

1. Disconnect machine from electrical supply before removing any panels for servicing.

2. Remove a side panel and the header panel.

WARNING

Hazardous voltage

6.7 CAB CONDENSER FAN MOTOR

A. FAN MOTOR REPLACEMENT

1. Shut the machine down and remove mix from the freezing barrel and cab.

2. Disconnect machine from electrical supply.

3. Remove the mix container and sliding drawer from the cab.

4. Disconnect the evaporator drain tube and remove the two thumb screws on the evaporator cover. Pull the cover off and set aside.

5. Remove the tubes from the mix transfer line and air line.

6. Remove the four screws on the fan shroud. The screws are attached to the cab wall.

7. Pull thermistor out of the clip and thread it up through the hole in the fan shroud.

8. Remove the fan shroud by tilting forward and pulling down (Refer to Figure 6-7).

3. Trace and disconnect the black and white wires on the T1 and T2 terminals on the compressor contactor.

4. Loosen set screw on fan blade.

5. Remove the three bolts from the fan motor mounting plate and remove the motor.

B. FAN MOTOR INSTALLATION

1. Attach motor to the mounting plate with the three bolts.

2. Place fan blade on motor shaft and tighten set screw.

3. Ensure purple wire is terminated.

4. Ensure red wire is terminated with blue wire.

5. Route white and black wires through the front panel to the compressor contactor.

6. Connect black wire to the T1 terminal.

7. Connect white wire to the T2 terminal.

Figure 6-7 Cab Fan Shroud

9. Remove the two fan bracket screws and disconnect wires.

10. Connect the wires to the new fan motor.

11. Attach the two screws to the fan motor bracket.

12. Tilt the fan shroud and move it into place.

13. Thread thermistor through hole in fan shroud and attach it to the clip.

14. Install fan shroud into cab with the four screws.

15. Install evaporator cover with the two thumb screws.

16. Install all tubes and replace sliding drawer and mix containers.

6.8 SWITCHES

A. SPIGOT SWITCH

The spigot switch is a normally closed, held open switch. When the spigot is pulled, the spigot switch sends a signal to the IntelliTec control to start the auger drive and refrigeration system. This signal moves the control to “Serve Mode”, or if it already is in “Serve Mode”, it resets the cycle count. After serving product, the IntelliTec continues a freezing cycle until the product reaches consistency.

COM

SPIGOT SWITCH TESTING - ELECTRICAL

1. Disconnect the switch from the circuit by unplugging the connector.

2. Check resistance readings across the common (COM) and normally closed (NC) terminals. When the spigot is closed, the resistance should show an open. When the spigot is opened, the switch will close and the resistance should be 0 ohms.

SPIGOT SWITCH ADJUSTMENT

1. Place the Main Power OFF/ON switch and the Freezing Cylinder OFF/ON switch in the OFF position.

2. Remove the header panel.

3. Loosen the bolts on the spigot switch.

4. Using a pencil, mark the spigot glide 1/4” from the spigot housing.

5. Adjust the switch to activate when the plastic glide reaches the mark.

6. Fully tighten the retaining bolts and remove mark from spigot glide.

Figure 6-8 spigot Cam Assemly

SPIGOT SWITCH TEST - ADJUSTMENT

NOTE

Adjustments to the spigot switch should be done after the product is at consistency in “Serve Mode” or when the machine is empty.

1. Open and close the spigot slowly. There should be a click when it opens and another when it closes.

2. The clicking sound should be within the ﬁ rst 1/2” of the spigot glide movement. If the switch does not close, an adjustment may be necessary.

WARNING

Hazardous voltage

Adjustment

Mark

Figure 6-9 Spigot Switch Replacement

SPIGOT SWITCH REPLACEMENT

1. Remove the header panel.

2. Remove the four bolts that attach the spigot cam assembly to the panel.

NOTE

Hold the spring on the rear left bolt to prevent it from snapping back.

3. Remove the assembly.

4. Disconnect the connector from the switch and remove the switch.

5. Install the replacement switch onto the handle assembly. Do not fully tighten the retaining screws at this time.

6. Using a pencil, mark the spigot glide 1/4” from the spigot housing. Adjust the switch to activate when the spigot handle moves the glide to the mark.

7. Fully tighten the retaining screws.

8. Attach the connector to the spigot switch.

9. Position the spigot handle assembly in the electrical box. Install the four bolts that attache the spigot cam assembly to the panel. Do not tighten the rear left bolt.

10. Thread the spring onto the rear left bolt using a needle nose pliers. Turn the bolt until the spring is threaded to the nut.

11. Tighten all bolts.

12. Replace the header panel and secure with the two Phillips head screws.

B. BLENDER ACTIVATION SWITCH

The switch is a normally closed, held open switch. When the spigot is pulled to the right, the switch closes the circuit and starts the blender.

SWITCH TESTING - ELECTRICAL

1. Disconnect the switch from the circuit by unplugging the terminals.

Blender

Activation

Switch

Attach

Pressure

Gauge

Figure 6-11 Attaching Gauge to Pump

SWITCH REPLACEMENT

1. Remove the header panel.

2. Disconnect the terminals from the switch and remove the switch.

3. Install the replacement switch onto the assembly

C. PUMP PRESSURE SWITCH

The pump pressure switch maintains 21-24 psig in the mix line.

PUMP PRESSURE SWITCH TEST

1. Turn off the pump motor.

2. Open the spigot to relieve air pressure in the system.

3. Connect a gauge between the 1/4” ID tubing and pump outlet in the cab (Refer to Figure 6-11).

4. Turn on the pump motor.

5. The motor should cutout when the gauge reads 24 psig ±1.

6. Open the spigot and monitor the gauge. The motor should cutin when the gauge reads 21 psig ±1.

Figure 6-10 Blender Activation Switch

6.9 POTENTIAL RELAY

The potential relay senses voltage produced by the start winding. When the rated pick-up voltage is reached, the relay will open and drop the start capacitor from the circuit.

6.10 TEMPERATURE CONTROL SENSOR

The temperature control sensor is a thermistor used to sense the temperature of the suction line. As the suction line temperature increases, the internal resistance of the thermistor will decrease. Refer to Figure 6-12 for the relationship between sensor resistance and temperature. The IntelliTec control board monitors this value. In “Serve Mode”, when the temperature of the sensor equals the Cut In T value on the control, a freezing cycle will start.

°F Resistance °F Resistance

-22 176950 40 26100

-20 165200 42 24725

-18 154300 44 23400

-16 144200 46 22175

-14 134825 48 21000

-12 126125 50 19900

-10 118050 52 18875

-8 110550 54 17900

-6 103550 56 17000

-4 97075 58 16125

-2 91025 60 15325

0 85400 62 14550

2 80150 64 13825

4 75275 66 13150

6 70725 68 12500

8 66475 70 11875

10 62500 72 11300

12 58800 74 10750

14 55325 76 10250

16 52100 78 9750

18 49075 80 9300

20 46250 82 8850

22 43600 84 8450

24 41125 86 8050

26 38800 88 7675

28 36625 90 7325

30 34575 92 7000

32 32675 94 6675

34 30875 96 6375

36 29175 98 6100

38 27600 100 5825

Figure 6-12 Resistance Related to Temperature

6.11 SPINNER SPEED CONTROL HARNESS

The blender speed on the SU412 and STU412 machines is controlled by a wire harness behind the header panel.

There are two wire harnesses available. The blender speed of the wire harness in the SU412 is 1600 rpm and the wire harness in the STU412 is 2400 rpm.

To change blender speeds, replace the wire harness.

SECTION 7

TROUBLESHOOTING

7.1 ERROR CODES

When the machine experiences a problem, one of the following error codes will be displayed on the control panel. Each error code directs you to the system location of the malfunction.

ERROR CODE MALFUNCTION

1 Soft

2 High Torque

3 Extended Run Time

4 Clean

5 Barrel Sensor

6 Hopper Sensor

7 Drive Motor

8 Cab Sensor

9 High Pressure Cutout

10 Auxiliary Sensor

11 Low Temperature

12 Left Hopper Sensor

13 Right Hopper Sensor

To return the machine to normal operation, any error causing condition must be corrected and the Freezing Cylinder Off-On switch must be placed in the Off position and back in the On position before the affected side of the machine will return to normal operation.

7.2 TROUBLESHOOTING - ERROR CODES

Error Code 1 - Soft Error

The Soft Error (E1) is an internal control board error

that is logged for future analysis. The refrigeration is never stopped and the machine will continue to operate normally.

Error Code 2 - High Torque

If the control panel displays a High Torque Error

(E2), the controller has sensed that the drive motor is running at 125% of the preset CutOut amp setting for 10 or more seconds. Very low and/or ﬂ uctuating supply voltages typically cause this error. The error can also be caused by faulty motor or starting components which coulc produce a high amp draw.

Error Code 3 - Run Time

The Run Time Error (E3) occurs when the

compressor runs continuously for 20 minutes without the product reaching consistency in “Serve Mode” or if the product does not reach proper temperature in “Sleep 2 Mode”. This error is generally caused by very low mix levels in the machine’s mix container or from product

breakdown. Another common cause results from a restriction preventing mix from entering the freezing cylinder. Check the mix in the cabinet. If the level mix is low, add mix. If there is a possibility that the mix is broken down, clean and sanitize the machine and replace the mix with fresh product.

Ice crystals in the liquid mix container can clog the

mix inlet system and prevent mix from entering the freezing cylinder. Thoroughly thaw mix per manufacturer’s recommendations. To check for ice crystals, pour a small amount of product in the mix container through a clean and sanitized sieve or strainer. If ice crystals are in the mix, check the temperature of the machine’s cabinet.

Check the condition of the neoprene hose running

through the mix pump head. If it shows signs of wear, rotate or replace it as outlined in Section

In air cooled machines, the Run Time Error may

indicate that airﬂ ow within the machine has reduced or stopped. Check the sides and top of the machine for anything that would restrict airﬂ ow.

The Run Time Error may also occur if airﬂ ow within

the machine has reduced or stopped. Check the sides and top of the machine for anything that would restrict airﬂ ow. Check the condenser ﬁ lter and clean if necessary. Check the evaporator for frost that could restrict airﬂ ow.

The compressor will run continuously if a solenoid

valve fails to open. This could be due to loose wiring, magnetic coil failure, a stuck valve or a faulty control board.

After the cause of the problem is found and

remedied place the Freezing Cylinder Off-On switch in the Off position and back in the On position.

Error Code 4 - Clean

If the machine is left in the Clean Mode for more

than 20 minutes, the control panel will display a Clean Error (Error 04). This condition does not reﬂ ect a problem with the machine itself. The Clean Error has been programmed into the controller as a safeguard to protect the machine from potential damage caused by the machine being accidentally left in “Clean Mode”. The control will attempt to restart itself after 5 minutes. The display will then ﬂ ash and read Restart. To immediately clear the Clean Error, place the Main Power Off-On switch in the Off position and back in the On position. After restarting the machine, a refrigeration cycle will begin. This protects the product in case the clean button was pressed by mistake.

Error Code 5 - Freezing Cylinder Sensor

The Freezing Cylinder Sensor Error (E5) indicates

a failure of the barrel sensor or an extreme out of range condition (< -34°F or > 99°F). If the control panel displays an E5, place the Freezing Cylinder Off-On switch in the Off position and back in the On position. If the control panel still displays the error code, refer to the machine’s wiring diagram and the Temperature Sensor Chart (Figure 7-1). Check each lead of the sensor to ground for continuity. If continuity is found, replace the sensor. To check the resistance of the sensor, place a thermocouple on the suction line at the exit of the freezing cylinder. Compare temperature and sensor resistance with the table as reference. If measured value does not coincide with a value on the table (± 400 ohms), replace the sensor.

NOTE

When the machine encounters a Freezing Cylinder Sensor Error, the machine will continue to run using preset timers. This mode will allow the operator to continue serving product until the machine can be serviced.

°F Resistance °F Resistance

-22 176950 40 26100

-20 165200 42 24725

-18 154300 44 23400

-16 144200 46 22175

-14 134825 48 21000

-12 126125 50 19900

-10 118050 52 18875

-8 110550 54 17900

-6 103550 56 17000

-4 97075 58 16125

-2 91025 60 15325

0 85400 62 14550

2 80150 64 13825

4 75275 66 13150

6 70725 68 12500

8 66475 70 11875

10 62500 72 11300

12 58800 74 10750

14 55325 76 10250

16 52100 78 9750

18 49075 80 9300

20 46250 82 8850

22 43600 84 8450

24 41125 86 8050

26 38800 88 7675

28 36625 90 7325

30 34575 92 7000

32 32675 94 6675

34 30875 96 6375

36 29175 98 6100

38 27600 100 5825

Figure 7-1 Temperature Sensor Resistance

(10K Ohms)

Error Code 6 - Hopper Sensor (single hopper machines)

The Hopper Sensor Error (E6) will not occur on

the U412 machine.

Error Code 7 - Drive Motor

If the control panel displays a Drive Motor Error

(E7), the control does not sense current coming from the drive motor. Place the Freezing Cylinder Off-On switch in the Off position and back in the On position. If the error returns, use the machine’s wiring diagram and check connections at the IntelliTec control and at the motor. An E7 may also be the result of a faulty drive motor contactor.

Error Code 8 - Cab Sensor

A Cab Sensor Error (E8) indicates a cabinet

temperature sensor failure or. This error will also appear in an extreme out of range condition (<

-34°F or > 99°F). If the control panel displays an E8, place the Freezing Cylinder Off-On switch in the Off position and back in the On position. If the control panel still displays the error condition code, refer to the wiring diagram and the temperature sensor value table. Check each lead of the sensor to ground for continuity. If continuity is found, replace the sensor. Place a thermocouple in the cabinet evaporator discharge airstream (outlet air ﬂ ow). Compare temperature to sensor resistance using the table as reference. If Cutin/ Cutout values do not coincide with the values on the table, replace the sensor..

Error Code 9 - High Pressure Cutout

High Pressure Cutout Errors (E9) are usually

caused by a dirty or inefﬁ cient condenser.

In air cooled condenser models, check for proper

air clearance around the machine.

In water cooled condenser models check for

proper water ﬂ ow.

If the error persists, contact your Authorized

Stoelting Distributor for further assistance.

Error Code 10 - Auxiliary Sensor

An Auxiliary Temperature Sensor Error (E10)

occurs if the temperature sensor on the control board fails. Place the Freezing Cylinder Off-On switch in the Off position and back in the On position. After the cause of the error is determined and corrected, place the Freezing Cylinder OffOn switch in the Off position and back in the On position.

Error Code 11 - Low Temperature

The Low Temperature Error (E11) occurs when the

temperature of the gas refrigerant at the freezing cylinder sensor falls below -20°F. Although the machine will not shut down, the active freezing cycle will immediately end. This error usually occurs when the machine continues to run in a low mix condition or if the machine runs out of mix. The product towards the front of the freezing cylinder tends to freeze solid. When the temperature on the freezing cylinder lowers to the preset value, the IntelliTec control will display an E11.

Error Code 12 - Hopper Sensor

The Left Hopper Sensor Error (E12) will not occur

on the U412 machine.

Error Code 13 - Hopper Sensor

The Right Hopper Sensor Error (E13) will not

occur on the U412 machine.

COMMO TIMEOUT Error

A COMMO TIMEOUT Error indicates a

communication interruption between the display and the control board. This error can be caused by a poor connection or a faulty phone cable. Disconnect and reconnect the telephone cable at the control board. If the error does not clear, disconnect and reconnect the telephone cable at the display panel module. If the error still appears, the cable may be faulty or the display panel module may be faulty.

ALTERNATING FLASHING CONTROL PANEL LIGHTS

The display panel lights will ﬂ ash in an alternating

sequence under any error codes. Clear the error and place the Freezing Cylinder Off-On switch in the Off position and back in the On position.

The alternating lights will also illuminate if the

Main Power switch is in the On position and the Freezing Cylinder switch is in the Off position.

7.3 TROUBLESHOOTING - MACHINE

PROBLEM POSSIBLE CAUSE REMEDY

1. Power to machine is off. 1. Check power to machine.

Drive motor (auger) “kicks-out”, or does not run.

Compressor does not operate.

Product too soft.

Freeze-up. (Product will not dispense easily.)

Rear auger seal leaks.

Spigot leaks.

Drive belts slipping or squealing.

Mix temperature too warm in cab.

Mix temperature too cold in cab.

2. Low line voltage. 2. Check, must be ±10% of nameplate voltage.

3. Product too hard. 3. Raise overrun. (See Section 4)

4. Front door not installed securely. 4. Install front door securely.

1. Power to machine is off. 1. Check power to machine.

2. Low line voltage. 2. Check, must be ±10% of nameplate voltage.

3. Compressor internal overload is cutout.

4. Front door not installed securely. 4. Install front door securely.

1. CutOut setting is too low 1. Adjust CutOut setting to match product

2. Product break down. 2. Fill with fresh product.

1. CutOut setting is too high. 1. Adjust CutOut setting to match product

2. Low overrun setting. 2. Raise overrun. (See Section 4)

3. Low pump pressure. 3. Check pump pressure.

4. Large air pocket in barrel. 4. Purge air from barrel.

5. Auger turning counter-clockwise. 5. Change rotation to clockwise.

1. Seal missing or installed wrong. 1. Install correctly. (See Section 3)

2. Rear seal o-ring missing, broken or not lubricated.

3. Worn or scratched shaft. 3. Replace shaft.

1. Spigot parts are not lubricated. 1. Lubricate. (See Section 3)

2. Chipped or worn o-rings. 2. Replace o-rings.

3. O-rings on spigot installed wrong. 3. Remove spigot and check o-rings.

4. Nicks or scratched on front door where spigot is located.

1. Drive belt tension not correct. 1. Adjust belt tension. (See Section 4)

2. Worn belt(s). 2. Replace belts.

3. Low overrun. 3. Check for air leak.

1. Temperature control set too warm. 1. Decrease CabCtOut and CabCutIn (See

2. Cab door is open. 2. Close the cab door.

1. Temperature control set too cold. 1. Increase CabCtOut and CabCutIn (See

3. Check condenser (air cooled)(See Sect. 4), or water supply (water cooled).

requirements.(See Section 3)

2. Inspect for breakage and lubricate properly (See Section 3)

4. Replace front door.

Section 4)

7.4 TROUBLESHOOTING - MIX PUMP

PROBLEM POSSIBLE CAUSE REMEDY

1. Power to pump is off. 1. Supply power to pump.

2. Low voltage. 2. Check for low voltage.

3. Mix pump hose jammed inside black cover/clamp.

Pump motor does not run.

4. Pump motor overloaded. 4. Allow internal thermal overload to reset;

5. Pressure switch on pump is defective. 5. Check mechanical operation and continuity of

6. Defective motor/capacitor. 6. Check motor amperage draw and/or capacitor.

7. Defective toggle switch. 7. Check continuity; repair or replace.

Note 1: A properly working pump will ﬁ ll an 8 oz. cup with mix in about 9 seconds.

3. Disconnect pump from power source. Remove four cover/clamp thumb screws. Separate cover/clamp halves and remove outer half. Remove jammed hose. Clean and re-install cover/clamp and tighten four thumb screws securely. Allow motor thermal overload to reset.

determine overload cause and repair.

pressure switch.

Replace motor or capacitor.

Pump operates but cylinder will not ﬁ ll.

Overrun too low or no overrun.

Note 2: Immediately after a bag change the pump may be unable to reestablish it’s prime with the system at operating pressure. In this case, turn the pump off. Draw 2-3 pints to reduce system pressure to zero. Turn pump on. Purge remaining air in mix bag and pick-up hose.

Important: before connecting the pick-up hose to the mix bag, remove as much air from the mix bag as possible.

1. Out of Mix. 1. Replenish mix supply.

2. Mix pump hose kinked inside black cover/clamp.

3. Hoses assembled incorrectly. 3. Refer to diagram for correct hose connections.

4. Mix pump hose service life is exceeded.

5. Mix pump hose not connected to machine.

6. Ice crystals in mix. 6. Completely thaw mix prior to use.

7. Mix bag drawn against adapter. 7. Ensure bag is clear of pick-up tube.

8. Foreign objects in mix. 8. Clear blockage. Use fresh mix.

9. Check valve is backwards. 9. Observe ﬂ ow arrow for proper orientation.

1. Overrun setting too low. 1. Increase overrun setting.

2. Air leak. 2. Tighten all hose clamps.

3. Air compressor not pumping air. 3. Contact local Stoelting Distributor.

4. Air check valve in backwards. 4. Check arrow for direction of ﬂ ow.

2. Disconnect pump from power source. Remove four cover/clamp thumb screws. Separate cover/clamp halves and remove outer half. Remove jammed hose. Clean and re-install cover/clamp and tighten four thumb screws securely. Allow motor thermal overload to reset.

4. Reposition/replace mix pump hose. See Section 4.9

5. Connect mix pump hose to machine.

PROBLEM POSSIBLE CAUSE REMEDY

Overrun too high.

Replacement mix pump hose won’t feed through pump.

Air exiting mix pickup hose.

Dispensed product air “pops”

Mix leakage from pump.

1. Mix pump hose service life is exceeded.

2. Out of mix. 2. Replenish mix supply.

3. Overrun setting too high. 3. Decrease overrun setting.

4. Pick-up leg of mix pump hose is collapsing.

1. Feeding hose into discharge hole of mix pump cover.

2. Hose ends not cut squarely. 2. Carefully cut hose end off squarely (no tails).

3. Force feeding too quickly. 3. Gently and slowly assist feeding of hose up

4. Pump motor not running. 4. Turn on motor switch.

1. Pickup tube check valve missing. 1. Contact local Stoelting Distributor.

1. Overrun setting too high. 1. Decrease overrun setting.

2. Mix pump hose service life is exceeded.

3. Overdrawing the machine’s capacity. 3. Reduce dispense rate.

4. Recent low mix condition. 4. Open spigot fully and allow excess air to

CAUTION: To prevent mix pump damage from dried mix deposits, immediately disassemble and clean pump.

1. Mix pump hose service life is exceeded.

Note: The action of the air compressor rocking arm creates a repetitive clicking sound during operation. This is normal.

1. Reposition/replace mix pump hose.

4. Reposition hose.

1. Feed hose into suction side of cover.

into pick-up hose side of cover.

2. Reposition/replace mix pump hose.

escape.

1 Remove mix pump hose. Disconnect pump

from power source. Remove mix pump cover/ clamp. Clean the rollers a small amount of soapy water. Clean mix from pump. See Section 4.2 for hose replacement.

Pump is noisy/ squeaking.

Mix in air hoses.

Note: The peristaltic mix pump has three squeeze rollers that use self lubricating bearings. If squeaking exists with the mix pump hose in place and stops with the hose removed, the squeeze roller bearings can be lubricated using a silicone based spray. Remove the mix pump hose. Disconnect pump from electrical power. Remove four cover/clamp thumbscrews. Remove entire cover/clamp as one unit. Spray silicone based lubricant on each end of each squeeze roller. Spin rollers to work lubricant into bearings. Repeat as needed.

Caution: Do not use cleaning/dissolving type lubricants like wd-40. These lubricants are not bearing friendly and will accelerate bearing wear.

1. Air/mix tee above black cover/clamp. 1. Air/mix tee must be below black cover/clamp.

2. Air leak. 2. Tighten all hose clamps.

3. Mix hose on wrong air/mix tee ﬁ tting. 3. Refer to diagram for correct hose connections.

4. Pressure control manifold o-ring leak. 4. Check o-ring and manifold; replace as

required.

SECTION 8

REPLACEMENT PARTS

8.1 AUGER SHAFT AND FRONT DOOR PARTS

Part Number Description Quantity

162155 Scraper Blade (6.875” Long) 2 482004 Knob (Air Bleed Valve) 1 482019 Knob - Front Door (Black) 4 624520 O-Ring - Air Bleed Valve - Black 2 624614 O-Ring - Spigot - Black 2 624678 O-Ring - Rear Seal - Black 2 625314 O-Ring - Front Door - Black 1 667868 Seal - Rear Auger (Orange) 1 694200 Spring - Air Bleed Valve 1 2183597-SV Front Door w/Pins & Air Bleed Valve 1 2183751 Scraper Blade (13.875” Long) 1 2183755 Valve - Air Bleed 1 2183772 Spigot Body 1 2187880 Adapter - Rear Seal (Two O-Ring Style) 1 2187907 Bushing - Front Auger Support 1 2187941 Auger Shaft 1

8.2 BLENDER PARTS AND TRAYS

744252

417010

744287

Part Number Description Quantity

274031 Blender Agitator Collar (SU412) 1 417010 Grid - Drip Tray 1 521026 Blender Agitator (SU412) 1 522839 Blender Motor (SU412) 1 674147 Blender Shaft (5”) (SU412) 1 674174 Blender Shaft (7.6”) (SU412) 1 674183 Blender Shaft (6.6”) (SU412) 1 681518 Shield - Plastic Swing (SU412) 1 744252 Tray - Drain (Rear) 1 744287 Tray - Drip 1 2183606 Splash Shield Bracket (SU412) 1

8.3 CAB TUBING ASSEMBLY

Part Number Description Quantity

264235 Clamp - Metal (1/4” ID Tubing) (Cab) 4 264241 Clamp - Metal (1/2” ID Tubing) (Cab) 2 264243 Clamp - Metal (3/8” ID Tubing) (Cab) 2 375819 Elbow - Barbed (3/8”- 1/4”) (Cab) 1 376041 Tee Connector - 3-Way (Stainless) (Cab) 1 558109 Mix Container Only (Cab) 1 624607 O-Ring - Check Valve Body - Black (Cab) 2 694247 Spring - Cone (Cab Check Valve) 1 696152 Clip - Lock (Check Valve) (Cab) 3 756067 Tubing - 1/4” ID - Clear - Air Line (25’ Increments) (Per Inch) 13” 756079 Tubing - 3/8” ID - Clear - Mix Line (25’ Increments) (Per Inch) 24” 756088 Tubing - 1/2” ID - Clear - Mix Line (25’ Increments) (Per Inch) 6” 756204 Tubing - 1/4” ID - Pump (50’ Box Only) (Per Inch) (Cab) 756204-40 Tubing - 1/4” ID - Pump (Pre-Cut 40” Piece) (Cab) 4 762256 Check Valve - Mix Outlet (Cab) 1 1183187 Check Valve - Mix In Line (Outer) (Cab) 1 2177274 Clip - Retaining (Mix Probe To Cover) (Cab) 1 2202059 Pick-Up Tube - Mix (Cab) 1 3177229 Cover - Rear (Mix Container) (Cab) 1 3177262 Cover - Front (Mix Container) (Cab) 1

8.4 SPIGOT CAM ASSEMBLY

Part Number Description Quantity

428045 Knob - Spigot Handle (Black) 1 570000 Pin - Cotter (Spigot Cam) 1 570961 Pin - Cotterless Clevis (Spigot Cam) 1 695705 Spring - Blender Activation (SU412) 1 696044 Spring - Torsion (Spigot Cam) 3 718773 Switch - Spigot Cam 1 719099 Switch - Limit (Spinner) (SU412) 1 2183163 Glide - Spigot Socket (SU412) 1 2183527 Handle - Spigot (SU412) 1 2183550 Collar - Spigot (SU412) 1

8.5 FRONT PANEL

718895

493041

332541

719025-SV

Part Number Description Quantity

332541 Board - Display Module (Display Only) 1 493041 Indicator Light (Cab On - Off) 1 718895 Switch - Rocker (Cab On-Off) 1 719025-SV Switch - Membrane Strip 1

8.6 PART KITS

Part Number Description Quantity

128295 Rocker Arm Assembly w/Screw (Cab) 1 128296 Piston & Cylinder Sleeve Assembly (Cab) 1 1177436 Air Compressor Kit (Reed Valve, Piston & Cylinder Sleeve) (Cab) 2171962 Sensor Probe Kit 2187209 O-Ring & Bearing Kit (Ser. #0-28560) -

2177917 Brush Kit -

208135 Brush - 4” x 8” x 16” (Barrel) 1 208380 Brush - 1/4” x 3” x 14” 1 208387 Brush - 1/2” x 5” x 24” 1 208401 Brush - 1” X 3” X 10” 1 208465 Brush - 1” x 3-1/2” x 18” 1 208467 Brush - 3/8” x 1” x 5” 1

2187979 O-Ring Kit (Ser. #28561 Plus) -

624520 O-Ring - Air Bleed Valve - Black 1 624607 O-Ring - Check Valve Body - Black (Cab) 2 624614 O-Ring - Top & Bottom Spigot - Black 2 624678 O-Ring - Rear Seal - Black 1 625314 O-Ring - Front Door - Black 1

8.7 PUMP PARTS

Part Number Description Quantity

150809 Belt (Cab) 1 369037 Fitting - Flared Brass - Air Inlet (Cab) 1 376035 Tee Connector - Air Pressure Switch (Cab) 1 432003-SV Valve Head Only w/Tubes (Pump) (Cab) 1 522229 Motor - Pump (Cab) 1 538306 Nut - Motor Mounting (Cab) 4 598025 Pulley - Large (Cab) 1 644065 Screw - Rocker Arm (Cab) 1 650146 Set Screw - Pulley (Cab) 1 652412 Screw - Shoulder (Crank Arm Roller Assembly) (Cab) 1 653042 Screw - Thumb (Cover Clamp) (Cab) 4 667896 Seal - Bumper (Piston) (Cab) 1 717937 Switch - Pressure (Pump) (Cab) 1 762246 Check Valve - Air Line (Stainless) (Cab) 1 766058 Washer - Lock - Motor Mounting (Cab) 4 1171860 Spring - Check Valve (Pump) (Cab) 1 1171861-SV Needle Valve w/O-Ring (Pump) (Cab) 1 1171862 Screw - Air Filter Retainer (Cab) 1 1171863 Valve Guide (Pump) (Cab) 1 1171864 O-Ring - Needle Valve (Pump) (Cab) 1 1171866 Screw - Valve Head (Cab) 5 1171867 O-Ring (Pump Cylinder Sleeve) (Cab) 1 1171868 Reed Valve (Pump) (Cab) 1 1171870 Cylinder Sleeve (Pump) (Cab) 1 1171871 Spring - Piston (Cab) 1 1171872 Piston Spring Seat (Cab) 1 1171873 Piston (Pump) (Cab) 1 1171874 Ball Bearing - Single (Pump Rocker Arm) (Cab) 1 1171955 Set Screw - Eccentric (Cab) 1 1171956 Washer - Crank Arm - Nylon (Cab) 1 1171958 Filter - Air (Pump) (Cab) 1 1171959 O-Ring (Piston) (Pump) (Cab) 1 1171977 Roller (Crank Arm) (Cab) 1 1171978 Screw - Crank Arm (Cab) 1 1171979 Crank Arm (Cab) 1 1171981 Eccentric (Cab) 1 1171982 Knob - Crank Arm Overrun Setting (Cab) 1 1171983 Dial - Crank Arm Overrun Setting (Cab) 1 1171984 Pointer - Crank Arm Overrun Setting (Cab) 1 1171985 Dowel Pin - Rocker Arm (Cab) 1 1171986 Flange Bearing - Rocker Arm (Cab) 2 1171987 Wick - Rocker Arm (Cab) 1 1171988 Collar - Rocker Arm Dowel Pin (Cab) 1 1171989 Pulley - Small (Pump) (Cab) 1 1171994 Sleeve Bearing - Crank Arm (Cab) 1 1177033 Bumper Ring (Piston) (Pump) (Cab) 1 1177034 Air Filter Retainer - Top (Cab) 1 1177035 Air Filter Retainer - Bottom (Cab) 1 1177036 Washer - Air Filter Retainer (Cab) 1 1177037 Screw - Air Filter (Cab) 1 1177681 Rocker Arm (Cab) 1 2177812 Roller Carrier Assembly Kit (Cab) 2183067 Pump Body Casting (Cab) 1 3171952 Cover - Clamp (Two Piece Black) (Cab) 1

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8.7 PUMP PARTS (CONTINUED)

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8.8 CAB INTERIOR

Part Number Description Quantity

128311 Hinge - Door (Top & Bottom) (Cab) 2 128312 Mix Container Holder Assembly w/Rollers (Cab) 1 162048 Blade - Fan (Evaporator) (Cab) 1 266018 Clip - “J” (Hose Holder) (Cab) 1 266076 Clip - Bag In Box (Cab) 2 284095 Evaporator (Cab) 1 396449 Gasket - Door (Cab) 1 522307-SV Motor - Fan (Evaporator Assembly) (Cab) 1 672724 Sensor - Capacitive (Cab) 1 719123-SV Switch - Pushbutton Door (Cab) 1 736084 Thermometer (Cab) 1 2183763 Mix Container Drawer (Cab) 1 2183765 Handle - Door (Cab) 1 2187296 Guard - Fan (Cab) 1 2187306 Door Assembly - Foamed (Cab) 1 2187931 Switch Kit - Cab Door (Hamlin Reed Switch) (Cab) -

8.9 HEADER PANEL - ELECTRICAL

688026

295017

765214

718537

202198

521686-230

718532

744142

Part Number Description Quantity

202198 Switch - Blender Power & Reset (SU412) 1 229116 Cable - Phone (control Board to Display Board) 1 230638 Capacitor - Start (#282047 Compressor) 1 231057 Capacitor - Run (#282047 Compressor) 1 295017 Contactor (45CG20AG) (Drive Motor / Compressor / Cab) 2 521686-230 Program Board - IntelliTec (208V / 230V) 1 618180 Relay (Compressor) 1 688026 Blender Outlet Socket (SU412) 1 718532 Switch - Toggle (Freezing Cylinder On-Off ) 1 718537 Switch - Limit (Door Interlock) & (SU412 - Blender Activation) 2 744142 Transformer 1 765214 Varistor Harness 4

618180

231057

230638

8.10 LEFT HAND SIDE

284085

342004

162077

522291

614232

598245

493042

231101

762454

152237

763422

458003

598072

522858-SV

762978

Part Number Description Quantity

152237 Belt - Gripnotch (AX35) (50 Hz) / (60 Hz Ser. #28561 Plus) 1 152245 Belt - V (4L350) (60 Hz) (Ser. #0- #28560) 1 162077 Blade - Fan (Air-Cooled Condenser) 1 231078 Capacitor - Run (#522858 Motor) 1 231095 Capacitor - Start (#522858 Motor) 1 231101 Cap Tube Only 1 284085 Condenser (Air-Cooled) 1 284104 Condenser (Water-Cooled) 1 342004 Drier (Liquid Line) 1 368325 Filter - Air (Condenser) 1 458003 Indicator - Liquid Line 1 493042 Flasher - Indicator Light (Cab On - Off) 1 522291 Motor - Fan (Air-Cooled Condenser) 1 522858-SV Motor - Drive (60 Hz) 1 522859 Motor - Drive (50 Hz) 598072 Pulley - Drive Motor (60 Hz) (Ser. #0- #28560) 598245 Pulley - Speed Reducer (60 Hz) (Ser. #0- #28560) 598296 Pulley - Speed Reducer (60 Hz) (Ser. #28561 Plus) 1 598540 Pulley - Drive Motor (60 Hz) (Ser. #28561 Plus) 1 614232 Speed Reducer 1 762454 Valve - Expansion 1 762978 Valve - EPR (Cab) 1 763422 Valve - Solenoid (Liquid Line) (Has 2) 2 763181 Valve - Water 1

8.11 RIGHT HAND SIDE

2202439-SV

272065

763423

762275

762454

762329

762457-SV

Part Number Description Quantity

272065 Valve Coil - Solenoid (#763723 Valve) 1 762275 Valve - Magna Check (Cab) 1 762329 Valve - Magna Check (EPR) (Cab) 1 762454 Valve - Expansion 1 762457-SV Valve - Expansion (w/Oriﬁ ce) (Cab) 1 763422 Valve - Solenoid (Liquid Line) (Has 2) 2 763423 Valve - Solenoid (Suction Side) (Has 1) 1 763482 Valve Coil - Solenoid (#763422) 2 2202439-SV Evaporator & Auger Kit 1

763482

763422

8.12 REAR

718794

762359

763017

737039

282047

558004

Part Number Description Quantity

282047 Compressor - 1 PH - 60 Hz (Scroll) (No Capacitors) 1 282059 Compressor - 1 PH - 50 Hz (Scroll) (No Capacitors) 558004 Condensate Pan 1 718794 Switch - High Pressure Cutout 1 737039 Thermostat - Discharge Line 1 762359 Valve Core (Schrader) 763017 Valve - Hot Gas Bypass 1 778027 Wrench - Allen (Cab) 1

8.13 BRUSHES, DECALS AND LUBRICATION

Part Number Description Quantity

208135 Brush - 4” X 8” X 16” (Barrel) 1 208380 Brush - 1/4” X 3” X 14” 1 208387 Brush - 1/2” X 5” X 24” 1 208465 Brush - 1” X 3-1/2” X 18” 1 208467 Brush - 3/8” X 1” X 5” 1 324014 Decal - Black Arrow on White Back 1 324065 Decal - Water Inlet 1 324103 Decal - Caution Rotating Shaft 1 324106 Decal - Caution Electrical Wiring Materials 1 324107 Decal - Caution Hazardous Moving Parts 1 324125 Decal - Danger Electric Shock Hazard 1 324141 Decal - Caution Rotating Blades 1 324200 Decal - High Pressure Cut-Out 1 324208 Decal - Attention Refrigerant Leak Check 1 324346 Decal - Caution Hazardous Moving Parts 1 324478 Decal - Electrical Box 1 324509 Decal - Cleaning Instructions 1 324566 Decal - Wired According To 1 324584 Decal - Adequate Ventilation 3” 1 324686 Decal - Danger Automatic Start 1 324803 Decal - Domed Stoelting Logo (Large) (Header Panel) 1 324804 Decal - Domed Stoelting Swirl (Header Panel) 1 324825 Decal - Main Freezer Power 1 324826 Decal - Cab Off 1 324827 Decal - Freezing Cylinder 1 324835 Decal - Blender Power On / Off (SU412) 1 324837 Decal - Caution Blender (SU412) 1 508048 Lubricant - Spline (2 oz Squeeze Tube) 1 508135 Petrol Gel - 4 oz Tube 1 513625 Manual Owner’s 1 1177990 Caster Kit - 4” (Set Of 4) -

8.14 STAINLESS STEEL PANELS

Part Number Description Quantity

647653 Screw - Panel (Top, Header) & Cab (Door Handle & Bottom Hinge) 6 647899 Screw - Panel (Side, Rear & Front Shroud) & Cab (Top Hinge) 8 2183610 Panel - Top (Air-Cooled) 1 2183611 Support - Drip Tray 1 2183760 Panel - R.H. Side 1 2183761 Panel - L.H. Side 1 2183762 Panel - Rear 1 2183774 Panel - Top (Water-Cooled) 1

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8.15 REFRIGERATION DIAGRAM AND WIRING DIAGRAM

DOMESTIC WARRANTY

(Including Mexico)

SOFT SERVE / SHAKE EQUIPMENT

1. Scope: PW Stoelting, L.L.C. (“Stoelting”) warrants to the first user (the “Buyer”) that the freezing cylinders,

hoppers, compressors, drive motors, speed reducers, and augers of Stoelting soft serve / shake equipment will be free from defects in materials and workmanship under normal use and proper maintenance appearing within five (5) years, and that all other components of such equipment manufactured by Stoelting will be free from defects in material and workmanship under normal use and proper maintenance appearing within twelve (12) months after the date that such equipment is originally installed.

2. Disclaimer of Other Warranties: THIS WARRANTY IS EXCLUSIVE; AND STOELTING HEREBY DISCLAIMS ANY

IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE.

3. Remedies: Stoelting’s sole obligations, and Buyer’s sole remedies, for any breach of this warranty shall be the

repair or (at Stoelting’s option) replacement of the affected component at Stoelting’s plant in Kiel, Wisconsin, or (again, at Stoelting’s option) refund of the purchase price of the affected equipment, and, during the first twelve (12) months of the warranty period, deinstallation/reinstallation of the affected component from/into the equipment. Those obligations/remedies are subject to the conditions that Buyer (a) signs and returns to Stoelting, upon installation, the Start-Up and Training Checklist for the affected equipment, (b) gives Stoelting prompt written notice of any claimed breach of warranty within the applicable warranty period, and (c) delivers the affected equipment to Stoelting or its designated service location, in its original packaging/crating, also within that period. Buyer shall bear the cost and risk of shipping to and from Stoelting’s plant or designated service location.

4. Exclusions and Limitations: This warranty does not extend to parts, sometimes called “wear parts”, which are generally expected

to deteriorate and to require replacement as equipment is used, including as examples but not intended to be limited to o-rings, auger flights, auger seals, auger support bushings, and drive belts. All such parts are sold

AS IS.

Further, Stoelting shall not be responsible to provide any remedy under this warranty with respect to

any component that fails by reason of negligence, abnormal use, misuse or abuse, use with parts or equipment not manufactured or supplied by Stoelting, or damage in transit.

THE REMEDIES SET FORTH IN THIS WARRANTY SHALL BE THE SOLE LIABILITY

STOELTING AND THE EXCLUSIVE REMEDY OF BUYER WITH RESPECT TO EQUIPMENT SUPPLIED BY STOELTING; AND IN NO EVENT SHALL STOELTING BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER FOR BREACH OF WARRANTY OR OTHER CONTRACT BREACH, NEGLIGENCE OR OTHER TORT, OR ON ANY STRICT LIABILITY THEORY.

SFWARR-013

Revision 04

Page 1 of 1

Stoelting U412 Operators Manual

Specifications and Main Features

Frequently Asked Questions

User Manual