Vollrath STOELTING U421-I2A Bedienungsanleitung

Model U421-I2A & U431-I2A

SERVICE MANUAL

Manual No. 513721 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 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.

White Glove Service Network

Phone: 888.319.9549

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 Introduction

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

1.2 Speciﬁcations ............................................................................................. 2

1.3 Component Settings ................................................................................... 4

2 Refrigeration System

2.1 Refrigeration System .................................................................................. 5

2.2 Refrigerant Recovery and Evacuation........................................................ 6

2.3 Refrigerant Charging .................................................................................. 6

2.4 Compressor ................................................................................................ 6

2.5 Condenser .................................................................................................. 8

2.6 Valves ......................................................................................................... 8

A. Thermostatic Expansion Valve (TXV) ..................................................................8

B. Check Valve .........................................................................................................9

C. High Pressure Cutout...........................................................................................9

D. Evaporator Pressure Regulator (EPR).................................................................10

E. Water Valve (Water Cooled Models Only)............................................................ 10

2.7 Solenoid (Air Cooled Remote Only) ........................................................... 11

2.8 Filter Drier................................................................................................... 12

3 Electrical and Mechanical Control Systems

3.1 IntelliTec2 Control ....................................................................................... 13

3.2 Contactors .................................................................................................. 13

3.3 Drive Motor ................................................................................................. 13

3.4 Capacitors .................................................................................................. 14

3.5 Gearbox...................................................................................................... 15

3.6 Condenser Fan Motor (Air-Cooled Only).................................................... 15

3.7 Cab Condenser Fan Motor ......................................................................... 16

3.8 Switches ..................................................................................................... 16

A. Spigot Switch .......................................................................................................16

B. Pump Pressure Switch.........................................................................................17

3.9 Temperature Control Sensor ...................................................................... 18

4 Troubleshooting

4.1 Error Codes ................................................................................................ 19

4.2 Troubleshooting .......................................................................................... 19

4.3 Troubleshooting - Machine ......................................................................... 22

Section Description Page

5 Replacement Parts

5.1 Brushes, Decals, and Lubrication............................................................... 23

5.2 Auger Shaft and Door Parts ....................................................................... 24

5.3 Cab Tubing ................................................................................................. 25

5.4 Trays........................................................................................................... 26

5.5 Panels & Screws ........................................................................................ 26

5.6 Cabinet ....................................................................................................... 27

5.7 Cabinet Evaporator..................................................................................... 28

5.8 Pump Parts................................................................................................. 29

5.9 Spigots........................................................................................................ 31

5.10 Electrical ..................................................................................................... 32

5.11 Motor .......................................................................................................... 33

5.12 Cabinet Condensing Unit............................................................................ 34

5.13 Side View.................................................................................................... 35

5.14 Air-Cooled Remote Condensers................................................................. 36

5.15 Kits and Miscellaneous............................................................................... 37

6 Refrigeration Diagram and Wiring Diagrams

6.1 Refrigeration Diagrams............................................................................... 39

6.2 Wiring Diagrams ......................................................................................... 40

A. U421-48I2A..........................................................................................................40

B. U421-409I2A........................................................................................................41

C. U421-109I2A........................................................................................................42

E. U431-48I2A..........................................................................................................43

F. U431-38I2A..........................................................................................................44

G. U431-18I2A..........................................................................................................45

H. U431-409I2A........................................................................................................46

I. U431-309I2A........................................................................................................47

J. U431-109I2A........................................................................................................48

Service Manual #513721 1 U421-I2A & U431-I2A Model Machines

SECTION 1

DESCRIPTION AND SPECIFICATIONS

1.1 DESCRIPTION

The Stoelting U421-I2A and U431-I2A ﬂoor model ma-

chines are pressure fed. They are equipped with fully

automatic controls to provide a uniform product.

This manual is designed to assist qualiﬁed service per-

sonnel with troubleshooting and repairing the U421-I2A

and the U431-I2A.

NOTE

Thesemachinesare offeredwithtwotypesof spigot

handles,swing gateand pull-down. Theswing gate

styleis opened bymoving the handle to theleft and

must be closed when ﬁnished dispensing. The

pull-down style is opened by pulling downwards

and are self-closing.

Figure 1-1 Model U431-I2A

Figure 1-1 Model U421-I2A

Service Manual #513721 2 U421-I2A & U431-I2A Model Machines

1.2 SPECIFICATIONS

Air Cooled

U421-I2A & U431-I2A Air Cooled Remote

U421-I2A & U431-I2A Water Cooled

U421-I2A & U431-I2A

Dimensions Machine with crate 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)

26-3/4’’

(67,9 cm)

34’’

(86,4 cm)

height 68-3/4’’

(174,6 cm)

78’’

(198,1 cm)

67-3/4’’

(172,1 cm)

78’’

(198,1 cm)

67-1/2’’

(171,5 cm)

78’’

(198,1 cm)

depth 39-1/2’’

(100,3 cm)

48’’

(121,9 cm)

39-3/4’’

(101,0 cm)

48’’

(121,9 cm)

39-1/2’’

(100,3 cm)

48’’

(121,9 cm)

Weight 785 lbs

(356,0 kg)

935 lbs

(424,1 kg)

760 lbs

(344,7 kg)

908 lbs

(411,8 kg)

760 lbs

(344,7 kg)

908 lbs

(411,8 kg)

Electrical 1 PH 3 PH 1 PH 3 PH 1 PH 3 PH

circuit ampacity

(per barrel) 32A 20A 36A Left /

31A Right 20A 32A 20A

overcurrent protection

device (per barrel) 50A 30A 50A Left /

45A Right 30A 50A 30A

The machine requires one dedicated electrical circuit per barrel.

Compressor Two - 19,000 Btu/hr

Cabinet - 1,300 Btu/hr Compressor (R-134a)

Drive Motor Two - 2 hp

Cooling Air cooled units require 6”

(15,2 cm) air space on all

sides and open at the top.

Remote air cooled

requires two remote

condensers and two

precharged line sets.

Water cooled units require

1/2” N.P.T. water and

drain ﬁttings. Maximum

water pressure of 130

psi. Minimum water ﬂow

rate of 3 GPM per barrel.

Ideal EWT of 50°-70°F.

The machine requires 6”

(15,2 cm) air space on

all sides for the cabinet

refrigeration system.

Mix Storage Up to six 5-gallon bags

Freezing Cylinder

Volume Two - 1.33 gallon (5,03 liters)

Service Manual #513721 3 U421-I2A & U431-I2A Model Machines

Menu Display U421 I2A & U431 I2A

Basic Enable Control Temp/Temp

CutOut Consist Offset 5

CutIn Consist Offset 55

CutIn Temp 40 °F

CutOut Temperature 12 °F

Cycles In Serve Mode 50

Advanced Standby On Time 10 sec

Standby Off Time 360 sec

Standby Time 120 min

Stir On 10 sec

Stir Off 1200 sec

Sleep 2 CutIn 70 °F

Sleep 2 CutOut 54 °F

Default Off Time 900 sec

Storage Storage Refrigeration Active

Storage CutIn 39 °F

Storage CutOut 36 °F

Storage Offset 2 °F

Storage Off Time 4 min

Storage On Time 360 sec

Storage Max On 10 min

Storage Recovery 1 min

Storage Too Warm 50 °F

Storage Too Warm 2 hr

U421-I2A & U431-I2A

Refrigerant R-404A

Charge A/C - 48 oz

W/C - 36 oz

Remote - 224 oz

Suction Pressure 19-21 psig

Discharge Pressure

at 80ºF Ambient

A/C - 235-240 psig

W/C - 225-235 psig

Cabinet

Refrigerant R-134A

Charge 8 oz

EPR Valve 32-34 psig

Service Manual #513721 4 U421-I2A & U431-I2A Model Machines

1.3 COMPONENT SETTINGS

Following are the settings for the components in the

U421-I2A and U431-I2A machines.

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.

Compressor Electrical S to C R to C

282106 1 PH 60Hz 1.340.94

282107 3 PH 60Hz 1.531.21

282108 3 PH 50Hz 3.811.33

Rating

Capacitor Part MFD VAC

Cab Compressor 230667 80 MFD 220 VAC

Compressor - Run 231047 45 MFD 370 VAC

Compressor - Start 230638 88-106 MFD 330 VAC

Drive Motor - Run 231075 30 MFD 370 VAC

Drive Motor - Start 230622 200 MFD 250 VAC

Fan Motor 230654 5 MFD 400 VAC

Pump Motor 1171960 15 MFD 370 VAC

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