Vollrath Stoelting O431 User manual

Model O431
SERVICE MANUAL
Manual No. 513641 Rev.1

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

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

TABLE OF
CONTENTS
Section Description Page
1 Description and Specifications
1.1 Description.................................................................................................. 1
1.2 Specifications ............................................................................................. 2
1.3 Modes of Normal Operation ....................................................................... 3
A. Initial Status..........................................................................................................3
B. Serve Mode..........................................................................................................3
C. Standby Mode......................................................................................................3
D. Sleep 1 Mode.......................................................................................................4
E. Sleep 2 Mode.......................................................................................................4
F. IntelliTec Restart...................................................................................................4
G. Sleep 3 Mode.......................................................................................................4
H. Clean Mode..........................................................................................................5
1.4 Mix Level Indicators.................................................................................... 5
1.5 Storage Refrigeration ................................................................................. 5
1.6 Operation During Sensor Failure................................................................ 5
A. Serve and Standby Mode.....................................................................................5
B. Cabinet Refrigeration ...........................................................................................5
1.7 Motor Profile Cutout Compensation ........................................................... 5
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 Front Door...................................................................................13
B. Disassembly of Auger ..........................................................................................13
3.4 Cleaning Disassembled Parts .................................................................... 14
3.5 Sanitizing Machine Parts ............................................................................ 14
3.6 Cleaning the Machine................................................................................. 14
3.7 Assembling Machine .................................................................................. 14
3.8 Sanitizing .................................................................................................... 15

Section Description Page
3.9 Initial Freeze Down and Operation ............................................................. 16
A. Adding Mix ...........................................................................................................16
B. Preparing the IntelliTec Control............................................................................16
C. Initial Freeze Down ..............................................................................................16
D. Adjusting the IntelliTec Control.............................................................................16
E. Serving Product....................................................................................................17
3.10 Normal Freeze Down and Operation.......................................................... 17
3.11 Mix Information ........................................................................................... 17
3.12 Operation of Mix Pump............................................................................... 18
3.13 Mix Pump Cleaning .................................................................................... 18
3.14 Disassembly and Inspection of Removable Parts ...................................... 19
4 Maintenance and Adjustments
4.1 Machine 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 Machines) .............................................. 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
A. Refrigerant Recovery ...........................................................................................30
B. Evacuating the Refrigeration System...................................................................30
5.3 Refrigerant Charging .................................................................................. 30
5.4 Compressor ................................................................................................ 31
5.5 Condenser .................................................................................................. 32
5.6 Evaporator .................................................................................................. 32

Section Description Page
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. Water Valve (Water Cooled Models Only)............................................................ 35
5.8 Solenoid...................................................................................................... 36
5.9 Filter Drier................................................................................................... 37
5.10 Cab Unit...................................................................................................... 37
6 Electrical and Mechanical Control Systems
6.1 IntelliTec Controller ..................................................................................... 39
6.2 Contactors .................................................................................................. 39
6.3 Drive Motor ................................................................................................. 40
6.4 Capacitors .................................................................................................. 41
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. Pump Pressure Switch.........................................................................................44
C. Cab Door Magnetic Reed Switch.........................................................................44
6.9 Temperature Control Sensor ...................................................................... 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 Brushes, Decals and Lubrication................................................................ 53
8.2 Spigot Extension......................................................................................... 53
8.3 Auger Shaft and Front Door ....................................................................... 54
8.4 Cab Tubing Assembly................................................................................. 55
8.5 Spigot Cam Assembly ................................................................................ 56
8.6 Stainless Steel Panels................................................................................ 56
8.7 Rear............................................................................................................ 57
8.8 Right ........................................................................................................... 58
8.9 Left.............................................................................................................. 59
8.10 Front Panel and Header Panel ................................................................... 60
8.11 Cab Interior................................................................................................. 61
8.12 Pump Parts................................................................................................. 62
8.13 Part Kits ...................................................................................................... 64
8.14 Refrigeration Diagram and Wiring Diagram................................................ 65

1
SECTION 1
DESCRIPTION AND SPECIFICATIONS
Figure 1-1 Model O431
1.1 DESCRIPTION
The Stoelting O431 floor model machine is pressure fed.
The machine is equipped with fully automatic controls to
provide a uniform product. The machine is designed to
operate with almost any type of commercial soft-serve or
non-dairy mixes available, including ice milk, ice cream,
yogurt, and frozen dietary desserts.
This manual is designed to assist qualified service per-
sonnel and operators in the installation, operation and
maintenance of the Stoelting O431 pressure machine.

2
* CutOut value needs to be adjusted to product
requirements.
** The Refriger setting on the right control board
must be set to None.
Model O431
Dimensions Machine with crate
width 19-1/8’’ (48,6 cm) 27’’ (68,6 cm)
height 67-7/8’’ (172,4 cm) 78’’ (198,1 cm)
depth 37-3/4’’ (95,9 cm) 48’’ (121,9 cm)
Weight 500 lbs (226,7 kg) 650 lbs (294,8 kg)
Electrical 1 Phase, 208-240 VAC, 60Hz
Air Cooled Water Cooled
running amps 17A 15A
connection type NEMA L6-30P NEMA L6-30P
International Option 1 Phase, 220-240 VAC, 50Hz or 3 Phase, 380-415 VAC, 50Hz
Compressor 15,000 Btu/hr Scroll™ Compressor
Drive Motor Two - 3/4 hp
Air Flow Air cooled units require 3” (7,6 cm) air space on both sides and back.
Plumbing Fittings Water cooled units require 1/2” N.P.T. water and drain fittings.
Hopper Volume Two - 5.5 gallons (20,82 liters)
Freezing Cylinder
Volume Two - 1 gallon (3,79 liters)
O431
Refrigerant R-404A
Charge (W/C) 26 oz
(A/C) 36 oz
Suction Pressure
(at 72°F) 19-21 psig
Discharge Pressure 195-215 psig
Menu Display Value
Basic CutOut * amps
Cut In T 21 °F
Cycles 20 count
Stir On 15 seconds
Stir Off 300 seconds
Advanced On Time 28 seconds
Off Time 450 seconds
Stb Time 120 minutes
Sl1DrvOn 120 seconds
Sl1DrOff 180 seconds
Sl2CutIn 32 °F
Sl2CtOut 28 °F
DftOffTm 600 seconds
Storage Refriger ** 3 Cabinet
(Left CabCutIn 37 °F
control CabCtOut 33 °F
only) Cab Off 13 minutes
Cab On 130 seconds