Vollrath Stoelting U411 User manual

Model U411
SERVICE MANUAL
Manual No. 513688 Rev.0

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.

Section Description Page
1 Description and Specifications
1.1 Description.................................................................................................. 1
1.2 Specifications ............................................................................................. 2
1.3 Component Settings ................................................................................... 3
2 Refrigeration and Wiring Diagrams
2.1 Refrigeration Diagram ................................................................................ 5
2.2 Wiring Diagrams ......................................................................................... 6
3 Replacement Parts
3.1 Brushes, Decals & Lubrication ................................................................... 9
3.2 Trays........................................................................................................... 9
3.3 Auger Shaft & Front Door Parts.................................................................. 10
3.4 Cab Tubing ................................................................................................. 11
3.5 Pump Parts................................................................................................. 12
3.6 Spigot Assembly ......................................................................................... 14
3.7 Panels & Screws ........................................................................................ 14
3.8 Cab Components........................................................................................ 15
3.9 Electrical Components................................................................................ 16
3.10 Cab Condensing Unit ................................................................................. 17
3.11 Kits & Miscellaneous .................................................................................. 17
3.12 Motor Assembly .......................................................................................... 18
3.13 Right Side ................................................................................................... 19
3.14 Left Side ..................................................................................................... 20
TABLE OF
CONTENTS

Service Manual #513688 Rev.0 1 U411 Model Machines
1.1 DESCRIPTION
The Stoelting U411 floor model machine is pressure fed.
It is equipped with fully automatic controls to provide a
uniform product.
This manual is designed to assist qualified service person-
nel with information regarding the refrigeration and wiring
specifications, replacement parts and settings of the U411.
SECTION 1
DESCRIPTION AND SPECIFICATIONS
Figure 1-2 Dimensions
Figure 1-1 Model U411 I2 Machine

Service Manual #513688 Rev.0 2 U411 Model Machines
1.2 SPECIFICATIONS
Model U411
Dimensions Machine with crate
width 19-1/8’’ (48,6 cm) 27’’ (68,6 cm)
height 68-3/8’’ (173,7 cm) 78’’ (198,1 cm)
depth 37-5/8’’ (95,6 cm) 48’’ (121,9 cm)
Weight 450 lbs (204,1 kg) 650 lbs (294,8 kg)
Electrical 1 Phase, 208-240 VAC, 60Hz 3 Phase, 208-240 VAC, 60Hz
running amps 18A 15A
connection type NEMA L6-30P NEMA L15-30P
Compressor 15,000 Btu/hr Scroll™ Compressor
Cabinet - 1,300 Btu/hr Compressor (R-134a)
Drive Motor 2 hp
Air Flow Air cooled units require 3” (7,6 cm) air space at the back and sides.
Plumbing Fittings Water cooled units require 1/2” N.P.T. water and drain fittings.
Hopper Volume 8 gallons (30,29 liters)
Freezing Cylinder
Volume 1.33 gallon (5,03 liters)
U411
Refrigerant R-404A
Charge (W/C) 26 oz
(A/C) 40 oz
Suction Pressure
(at 72°F) 19-21 psig
Discharge Pressure 220-230 psig
Cabinet
Refrigerant R-134A
Charge 8 oz
Cab Suction
Pressure 33 psig

Service Manual #513688 Rev.0 3 U411 Model Machines
1.3 COMPONENT SETTINGS
Following are the settings for the components in the
U411 I2 machine.
A. COMPRESSOR WINDINGS
When testing the compressor windings the resistance
through the windings should be as follows:
B. CAPACITORS
Refer to the following table for the capacitance of all the
capacitors in the machine:
C. PUMP PRESSURE SWITCH
The pump pressure switch, located in the cabinet, main-
tains 21-24 psig in the mix line.
°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
D. TEMPERATURE CONTROL SENSOR
The following table shows the relationship between the
thermistor resistance and the suction line temperature.
Rating
Capacitor Part MFD VAC
Compressor - Start 230638 88-106 MFD 330 VAC
Compressor - Start 231049 88-106 MFD 330 VAC
Compressor - Run 230653 40 MFD 370 VAC
Compressor - Run 231048 40 MFD 440 VAC
Motor - Start 230622 200 MFD 250 VAC
Motor - Run 231075 30 MFD 370 VAC
Fan Motor 230654 5 MFD 400 VAC
Cab Compressor 230667 80 MFD 300 VAC
Compressor Electrical S to C R to C
282076 1 PH 3.31Ω1.28Ω
282116 1 PH 1.70Ω1.02Ω
282117 3 PH 1.91Ω1.54Ω
282111 1 PH 16.40Ω10.20Ω

Service Manual #513688 Rev.0 4 U411 Model Machines