Vollrath U431-I2 Service Manual
Model U431 I2
OWNERS MANUAL
Manual No. 513660 March 2011
Owner’s Manual
For U431 I2 Series
Combination Soft Serve/Shake
Pressure Machine
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 the company at the following location:
STOELTING Ph: 800-558-5807
502 Hwy. 67
Kiel, WI 53042 Fax: 920-894-7029
© 2011 Stoelting, LLC, All Rights Reserved
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. There are hazards associated with
the operation of this machine. 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.
NOTICE
The signal word “NOTICE” indicates information or
procedures that relate directly or indirectly to the
safety or personnel or equipment/property.
TABLE OF
CONTENTS
Section Description Page
1 Description and Specifi cations
1.1 Description ..................................................................................................1
1.2 Specifi cations .............................................................................................2
2 Installation Instructions
2.1 Safety Precautions .....................................................................................3
2.2 Shipment and Transit ..................................................................................3
2.3 Machine Installation ....................................................................................3
2.4 Installing Wiring ..........................................................................................3
2.5 Mix Pump ....................................................................................................4
A. Mix Pump Hose Installation..................................................................................4
B. Mix Pickup Hose Installation ................................................................................4
C. Mix Low Level Indicator Adjustment .....................................................................6
3 Initial Set-Up and Operation
3.1 Operator’s Safety Precautions ...................................................................7
3.2 Operating Controls and Indicators ..............................................................7
3.3 Disassembly of Parts ..................................................................................8
3.4 Cleaning Disassembled Parts ....................................................................9
A. Remove Front Door ..............................................................................................9
B. Remove Auger .....................................................................................................9
3.5 Sanitizing Parts ...........................................................................................9
3.6 Cleaning the Machine .................................................................................9
3.7 Assembling the Machine ............................................................................10
3.8 Sanitizing ....................................................................................................11
3.9 Freeze Down and Operation ......................................................................11
3.10 Mix Information ...........................................................................................12
3.11 Operation of Mix Pump ...............................................................................12
Section Description Page
4 Maintenance and Adjustments
4.1 Overrun Adjustment ....................................................................................15
4.2 Mix Pump Hose Reposition ........................................................................15
4.3 Mix Pump Hose Replacement ....................................................................16
4.4 Drive Belt Tension Adjustment ....................................................................16
4.5 Condenser Cleaning (Air-Cooled Machines) ..............................................17
4.6 Preventative Maintenance ..........................................................................17
4.7 Extended Storage .......................................................................................17
5 Troubleshooting
5.1 Error Codes ................................................................................................19
5.2 Troubleshooting - Error Codes ...................................................................19
5.3 Troubleshooting - Machine .........................................................................21
5.4 Troubleshooting - Mix Pump .......................................................................23
6 Replacement Parts
6.1 Brushes, Decals and Lubrication ................................................................25
6.2 Trays ...........................................................................................................25
6.3 Auger Shaft and Front Door Parts ..............................................................26
6.4 Cab Tubing .................................................................................................27
SECTION 1
DESCRIPTION AND SPECIFICATIONS
1.1 DESCRIPTION
The Stoelting U431 I2 fl oor model machine is pressure
fed. It is equipped with fully automatic controls to provide
a uniform product.
This manual is designed to assist qualifi ed service per-
sonnel and operators with installation, operation and
maintenance of the U431 I2.
Figure 1-1 Model U431 I2 Machine
Figure 1-2 Dimensions
1
1.2 SPECIFICATIONS
U431-I2 Water Cooled U431-I2 Air Cooled
Dimensions Machine with crate Machine with crate
width 26-3/4’’ (67,9 cm) 34’’ (86,4 cm) 26-3/4’’ (67,9 cm) 34’’ (86,4 cm)
height 67-1/2’’ (171,5 cm) 78’’ (198,1 cm) 68-3/4’’ (174,6 cm) 78’’ (198,1 cm)
depth 39-1/2’’ (100,3 cm) 48’’ (121,9 cm) 39-1/2’’ (100,3 cm) 48’’ (121,9 cm)
Weight 760 lbs (344,7 kg) 908 lbs (411,8 kg) 785 lbs (356,0 kg) 935 lbs (424,1 kg)
Electrical 1 PH 3 PH 1 PH 3 PH
left right left right left right left right
minimum circuit
ampacity
maximum overcurrent
protection device
32A 32A 20A 20A 32A 32A 20A 20A
50A 50A 30A 30A 50A 50A 30A 30A
International Option
1 Phase, 220-240 VAC, 50Hz or
3 Phase, 380-415 VAC, 50Hz
Two - 19,000 Btu/hr
Compressor
Cabinet - 1,300 Btu/hr Compressor (R-134a)
Drive Motor Two - 2 hp
Water cooled units require 1/2” N.P.T.
water and drain fi ttings. Maximum
Cooling
water pressure of 130 psi. Minimum
water fl ow rate of 3 GPM. Ideal EWT
of 50°-70°F. The machine requires 6”
Air cooled units require 6” (15,2 cm) air
space on all sides and open at the top.
(15,2 cm) air space on all sides for the
cabinet refrigeration system.
Hopper Volume Two - 8 gallon (30,28 liters)
Freezing Cylinder
Volume
Two - 1.33 gallon (5,3 liters)
2
SECTION 2
INSTALLATION INSTRUCTIONS
2.1 SAFETY PRECAUTIONS
Do not attempt to operate the machine until the safety
precautions and operating instructions in this manual are
read completely and are thoroughly understood.
Take notice of all warning labels on the machine. The labels have been put there to help maintain a safe working
environment. The labels have been designed to withstand
washing and cleaning. All labels must remain legible for
the life of the machine. Labels should be checked periodically to be sure they can be recognized as warning labels.
If danger, warning or caution labels are needed, indicate
the part number, type of label, location of label, and quantity
required along with your address and mail to:
STOELTING
ATTENTION: Customer Service
502 Hwy. 67
Kiel, Wisconsin 53042
2.2 SHIPMENT AND TRANSIT
The machine has been assembled, operated and inspected
at the factory. Upon arrival at the fi nal destination, the
entire machine must be checked for any damage which
may have occurred during transit.
With the method of packaging used, the machine should
arrive in excellent condition. THE CARRIER IS RESPONSIBLE FOR ALL DAMAGE IN TRANSIT, WHETHER
VISIBLE OR CONCEALED. Do not pay the freight bill
until the machine has been checked for damage. Have
the carrier note any visible damage on the freight bill. If
concealed damage and/or shortage is found later, advise
the carrier within 10 days and request inspection. The
customer must place a claim for damages and/or shortages in shipment with the carrier. Stoelting, Inc. cannot
make any claims against the carrier.
2.3 MACHINE INSTALLATION
WARNING
Installation must be completed by a qualifi ed
electrician/refrigeration specialist.
Incorrect installation may cause personal injury,
severe damage to the machine and will void factory warranty.
B. Install the four casters. Turn the threaded end
into the machine until no threads are showing. T o
level, turn out casters no more than 1/4” maximum,
then tighten all jam nuts.
C. The machine must be placed in a solid level
position.
NOTE
Accurate leveling is necessary for correct drainage
of freezing cylinder and to insure correct overrun.
D. Machines with air cooled condensers require a
minimum of 6” (15,2 cm) air space on all sides
and an open top for proper circulation.
E. In air-cooled machines, use a voltmeter to measure
incoming voltage. If the supply voltage is 215 or
less, remove the right side panel and move the
voltage selector toggle switch to the 208V position.
F. Machines that have a water cooled condenser
require 1/2” NPT supply and drain fi ttings.
2.4 INSTALLING WIRING
A. Refer to the nameplate on the side panel of the
machine for specifi c electrical requirements. Make
sure the power source in the building matches
the nameplate requirements. Bring the wires into
the junction boxes through the access holes in
the bottom rear of the freezer.
NOTE
Three phase freezers in areas of unbalanced electrical loads require special attention when connecting input electrical power. The unbalanced leg of
power (called wild or high) must be connected to
L2 in the junction box.
B. Remove the back panel and the junction box
cover located at the bottom of the machine.
C. Install permanent wiring according to local code.
D. Check the auger shaft rotation by pressing the
Main Power On/Off button and pressing the Clean
Left and Clean right buttons. Auger shaft rotation
is clockwise as viewed through the clear front
door.
E. Press the Clean buttons to stop the augers after
checking the rotation.
Installation of the machine involves moving the machine
close to its permanent location, removing all crating, setting in place, assembling parts, and cleaning.
A. Uncrate the machine.
3
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 by pressing the Pump On/
Off button on the touchpad.
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 T ee is above the pump, mix may drain
into the air compressor resulting in pump damage.
10. Connect the free end of the mix pump hose to
the 3-way Tee (Fig. 2-3). When all connections
are complete, the 3-way Tee must be lower than
the black pump housing.
B. MIX PICKUP HOSE INSTALLATION
The machine may be connected to the standard mix
container or up to three prepacked mix bags. Follow the
instructions below that match your confi guration.
Standard Connection:
1. Place the mix pickup assembly through the hole
in the cover and install the retaining clip.
2. Connect a 24” (61cm) length of 3/8” (9,5mm)
ID plastic food grade tubing to the mix pickup
assembly. Secure with a hose clamp.
3. Connect the elbow fi tting to the free end of the
tubing. Connect the opposite end of the elbow
to 1/4” ID tan tubing on the left side of the pump
head. Secure with hose clamps (Fig. 2-3).
4
Figure 2-3 Mix Pump Connections for Standard Mix Container
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.
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 2-4).
4. If using two mix bags, repeat steps 1 to 3 for the
middle port.
5. Install a manifold plug into each empty inlet and
secure with a retaining clip.
5
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