Vollrath U421 User Manual
Model U421
OWNER'S MANUAL
Manual No. 513595 Mar., 2003 Rev. 1
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STOELTING® OWNER'S MANUAL
FOR
MODEL U421
CAB MODEL SOFT-SERVE PRESSURIZED FREEZER
This manual provides basic information about the freezer. Instructions and suggestions are given
covering its basic operation and care.
The illustrations and specifications are not binding in detail. We reserve the right to make changes
at any time without notice, to the freezer and its components, without incurring any obligation to
modify or provide new parts for freezers built prior to date of change.
DO NOT ATTEMPT to operate the freezer 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 freezer, contact the company at the
location listed below.
STOELTING, LLC Tele: 920-894-2293
502 Hwy 67
Kiel, WI 53042-1600 Fax: 920-894-7029
TABLE OF CONTENTS
Section 1 .............................................................................................................. 1
1.1 Description.............................................................................................. 1
1.2 Specifications.......................................................................................... 1
Section 2 .............................................................................................................. 3
2.1 Safety Precautions .................................................................................. 3
2.2 Shipment & Transit .................................................................................. 4
2.3 Freezer Installation................................................................................... 4
2.4 Installing Permanent Wiring...................................................................... 4
2.5 Mix Pump ................................................................................................ 5
Section 3 .............................................................................................................. 9
3.1 Safety Precautions .................................................................................. 9
3.2 Operating Controls and Indicators............................................................ 9
3.3 Sanitizing ................................................................................................ 10
3.4 Initial Freeze Down and Operation ........................................................... 11
3.5 Mix Information ........................................................................................ 12
3.6 Operation of Mix Pump ............................................................................ 12
3.7 Removing Mix from the Freezer ............................................................... 13
3.8 Cleaning the Freezer ............................................................................... 13
3.9 Disassembly of Freezer Parts.................................................................. 13
3.10 Routine Cleaning ..................................................................................... 14
3.11 Mix Pump Cleaning ................................................................................. 15
3.12 Sanitize Freezer Parts ............................................................................. 15
3.13 Assembly of Freezer................................................................................15
Section 4 .............................................................................................................. 19
4.1 Freezer Adjustment ................................................................................. 19
4.2 Product T emperature Adjustment ............................................................. 19
4.3 Overrun Adjustment ................................................................................. 19
4.4 Mix Pump Hose Reposition ..................................................................... 20
4.5 Mix Pump Hose Replacement.................................................................. 20
4.6 Cab T emp. Adjustment............................................................................. 20
4.7 Drive Belt T ension Adjustment.................................................................. 20
4.8 Condenser Cleaning (Air Cooled Freezers) ............................................. 21
4.9 Preventative Maintenance........................................................................ 21
4.10 Extended Storage ................................................................................... 21
4.11 Troubleshooting ....................................................................................... 22
Section 5 .............................................................................................................. 27
5.1 How to Order Replacement Parts ............................................................ 27
5.2 Parts Lists and Reference Drawings........................................................ 27
ILLUSTRATIONS
Figure 1 Model U421 Freezer..............................................................1
Figure 2a Air-Cooled Specifications ......................................................2
Figure 2b Water-Cooled Specifications .................................................2
Figure 3 Decal Locations.....................................................................3
Figure 4 Water/Electrical Connections .................................................4
Figure 5 Auger Rotation.......................................................................5
Figure 6 Mix Hose Installation...............................................................5
Figure 7 Mix Pump...............................................................................6
Figure 8 4 Way Tee .............................................................................7
Figure 9 Mix Inlet Tube & Probe Assy. Clip...........................................7
Figure 10 Hose Holder...........................................................................7
Figure 11 Operating Controls.................................................................9
Figure 12 Air Bleed Valves ....................................................................10
Figure 13 Draining Sanitizer ..................................................................11
Figure 14 Mix Container.........................................................................11
Figure 15 Mix Pumps.............................................................................12
Figure 16 Auger Flight Wear & Front Auger Support Bushing Wear .......13
Figure 17 Front Door Disassembly ........................................................14
Figure 18 Auger Flight Removal.............................................................14
Figure 19 Rear Seal Removal................................................................14
Figure 20 Cleaning Feed Tube ..............................................................16
Figure 21 Cleaning Air Tube..................................................................17
Figure 22 Removable Parts ...................................................................17
Figure 23 Rear Seal Lubrication ............................................................17
Figure 24 Spring Installation...................................................................18
Figure 25 Front Door Assembly .............................................................18
Figure 26 Potentiometer ........................................................................19
Figure 27 Overrun Adjustment................................................................19
Figure 28 Temperature Control Cab ......................................................20
Figure 29 Belt Adjustment......................................................................21
SECTION 1
INTRODUCTION
1.1 DESCRIPTION
The Stoelting U421 floor model freezer is pressure fed.
The freezer is equipped with fully automatic controls to
provide a uniform product. The freezer 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 personnel and
operators in the installation, operation and maintenance
of the Stoelting Model U421 pressure freezer.
1.2 SPECIFICATIONS
SNOISNEMID
THGIEW
LACIRTCELE
GNILOOC
Figure 1. Model U421 Freezer
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srotomevird.P.H2owT,hP3rohP1,tlov032/802
srosserpmoCHUTB06811owTdna
pot)mc52("01dnaecnaraelcdnuoralla)mc6,7("3s'qer.deloocriaroretaW
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Figure 2a. Air-Cooled Specification
Figure 2b. Water Cooled Specification
2
SECTION 2
INSTALLATION INSTRUCTIONS
2.1 SAFETY PRECAUTIONS
Do not attempt to operate the freezer until the safety
precautions and operating instructions in this manual are
read completely and are thoroughly understood.
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:
Take notice of all warning labels on the freezer. 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 freezer. Labels should be checked periodically to be sure they can be recognized as warning labels.
STOELTING, LLC
ATTENTION: Customer Service
502 Hwy. 67
Kiel, Wisconsin 53042
Figure 3. Decal Locations
1 324722 Decal Mix Low
2 324798 Decal Clean-Off-Serve Switch
3 324141 Decal Caution - Rotating Blades
4 723526 Tag Read Manual & All Decals
6 324393 Decal Stoelting Swirl Logo
7 324800 Decal Cab ON/OFF
8 324799 Pump On/Off
9 324208 Decal Refrig. Leak Check
11 324103 Decal Caution - Rotating Shaft
12 324686 Decal Danger Automatic Start
13 324107 Decal Caution Moving Parts
14 324125 Decal Elect.Shock Hazard
15 324151 Decal Field Connections
16 324198 Decal Attention Installer
17 130000 Bag, Envelope Front Loading
18 324584 Decal Adequate Ventilation
19 324158 Decal Copper Conductors Only
20 324106 Decal Caution Wiring Mat'l
22 324566 Decal Wired According To
23 324015 Decal 2 x 1-1/4 Blk on White
24 723552 Tag, Caution - Supply Voltage
26 324803 Decal GM Header (Stoelting Logo)
26 324804 Decal GM Header (Stoelting Swirl)
26 324805 Decal DQ Header (DQ Logo)
27 324346 Decal Caution Hazard.Moving
28 324797 Decal Standby/Serve
29 324242 Decal Temperature Control
30 324200 Decal Manual Reset
32 324014 Decal Arrow
33 324496 Decal Freezing
Water Cooled Only
A 324065 Decal Water Inlet
B 723525 Tag Winterizing Disconnect Line
C 723517 Tag, W/C Tower Instructions
D 324107 Decal Caution Moving Parts
Air Cooled Only
E 324346 Decal Hazardous Moving Parts
F 324107 Decal Caution Moving Parts
3
2.2 SHIPMENT AND TRANSIT
The freezer has been assembled, operated, and inspected at the factory. Upon arrival at the final destination, the freezer must be checked for any damage which
may have occurred during final transit.
With the method of packaging used, the equipment 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 freezer 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 ten days and request inspection. The customer
must place claim for damage and/or shortages in shipment with the carrier. Stoelting, LLC. cannot make
any claims against the carrier.
2.3 FREEZER INST ALLATION
WARNING
Installation must be performed by a qualified electrician/refrigeration specialist. Incorrect installation may
cause personal injury , severe damage to the machine
and will void factory warranties.
D. The freezer must have a minimum of 3" (7,5cm)
-6" (15cm) high ambient conditions- of space on all
sides and 10" (25cm) at the top for proper circulation.
CAUTION
Risk of product damage
Air cooled condenser requires proper ventilation. Failure to provide adequate ventilation will void factory
warranties.
E. Water-cooled freezers need an adequate water
supply . Install 1/2" (12,7mm) pipe or 1/2" (12,7mm)
inside diameter copper water line to the freezer .
Connect water outlet to a drain using a 1/2"
(12,7mm) inside diameter line. Automatic washer
hoses work well for final connections. All water
connections must comply with local codes. Fig. 4.
WARNING
Lifting hazard
Do not attempt to lift freezer manually . Use proper lift ing equipment such as a forklift, lift table, or pallet
jack, with lifting device positioned beneath the freezer’s
base. Ensure that personnel remain clear of suspended
load. Failure to do so may result in personal injury
and/or damage to the freezer that will void any factory
warranties.
Installation of the freezer involves moving the freezer close
to its permanent location, removing all crating, setting in
place, assembling parts, and cleaning.
A. Uncrate the freezer .
B. Install the four casters. Turn the threaded end into
the freezer until zero threads are showing. To level,
turn out casters no more than 1/4" maximum, then
tighten all jam nuts.
C. The freezer must be placed in a solid level position.
NOTE
Accurate leveling is necessary for correct drainage of
freezer barrel and to insure correct overrun.
Figure 4. Water/Electrical Connections
CAUTION
Flush all water lines before installation. In stores with
sediment in water, add suitable filter or strainer to water
inlet.
F. Place the CLEAN-OFF-SERVE switches in the OFF
position before continuing. Figure 1 1.
2.4 INSTALLING PERMANENT WIRING
Permanent wiring is required by local codes, the following
procedure must be performed:
WARNING
Hazardous voltage
High voltage will shock, burn or cause death. Turn off
and lock out main power disconnect before installing
wiring. Do not operate machine with cabinet panels
removed.
4
A. Refer to the nameplate at the rear of the freezer for
specific electrical requirements. Make sure the
power source in the building matches the freezer
nameplate requirements. Bring the wires into the
junction boxes through the access holes in the
bottom rear of the freezer. Figure 4.
NOTICE
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.
NOTICE
Verify actual volt age. Machine is equipped with
a transformer to supply a control circuit. You
will need to check voltage on terminal C1 and
C2 on EACH control board. (Located behind
decorative header panel on front of machine.)
Transformers are located behind electrical panel
enclosing control boards. Access these by removing top panel of machine. Actual transformer
voltage should read 20-28 V .A.C.
B. Remove the lower back panel and the two junc-
tion box covers located at the bottom of the
freezer .
Auger shaft rotation is clockwise as viewed through the
clear plastic front door. If the rotation is not clockwise,
turn main electrical power OFF . Then reverse L1 and L3
electrical power lines to the junction box (three phase
only). Re-check auger shaft rotation. Figure 5.
Figure 5. Auger Rotation
2.5 MIX PUMP
A. Mix Pump Hose Installation
Follow the steps below to install the mix pump hose.
1. Turn pump on.
2. Feed one end of mix pump hose into the entering or
pick-up hose side (left) of black cover.
C. lnstall permanent wiring according to local
code.
D. Check the auger shaft rotation by placing the
MAIN DRIVE switch in the CLEAN position.
6" (15cm)
3. Gently push the hose into the black cover until it
begins to feed.
4. Allow the hose to feed itself thru the pump until 6"
(15cm) remains on the entering side.
Figure 6. Mix Hose Installation
5
5.Turn pump off.
6.Connect mix pump hose to pickup hose
adapter using small hose clamp.
CAUTION
DO NOT TWIST MIX PUMP HOSE.
7.Turn pump off.
B. Connect 1/2 inch (12,7mm) I.D. plastic food grade
tubing to check valve and then to the mix container. Observe check valve flow arrow. Secure
with hose clamps. Then place assembly thru hole
in cover and install retainer clip. Figure 9.
C. Connect 1/2 inch (12,7mm) I.D. plastic food grade
tubing between the large port of air/mix tee and
refrigerated mix transfer line. Secure with large
hose clamp or equivalent. Figure 9.
8.Allow remaining 6" (15cm) of tubing to feed hru
pump until hose adapter prevents further feeding.
9.Turn pump off.
10.Connect free end of mix pump hose to "4
way Tee"
CAUTION
Air/Mix tee must remain below the black cover/
clamp. If the tee is above the pump mix will
drain to the air compressor resulting in pump
damage.
D. Connect mix low cords. Figure 9.
Figure 7. Mix Pump
STAINLESS 4-WAY TEE1177816 / 376017
6
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