Model U421/U444
(Serial #17978 and up)
OWNER'S MANUAL
Manual No. 513595-4 Feb. 2009 Rev . 4
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STOELTING® OWNER'S MANUAL
FOR
MODEL U421/U444
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.......................................................................................... 2
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 Important Information Regarding Cleaning and Sanitizing......................... 11
3.4 Disassembly of Freezer Parts.................................................................. 12
3.5 Cleaning Disassembled Parts ................................................................. 13
3.6 Sanitize Freezer Parts ............................................................................. 13
3.7 Cleaning the Freezer ............................................................................... 14
3.8 Assembling the Freezer........................................................................... 14
3.9 Sanitizing ................................................................................................ 16
3.10 Initial Freeze down and Operation............................................................ 16
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..................................... 18
Section 4 .............................................................................................................. 21
4.1 Freezer Adjustment ................................................................................. 21
4.2 Product T emperature Adjustment ............................................................. 21
4.3 Overrun Adjustment ................................................................................. 21
4.4 Mix Pump Hose Reposition ..................................................................... 22
4.5 Mix Pump Hose Replacement.................................................................. 22
4.6 Cab T emp. Adjustment............................................................................. 22
4.7 Drive Belt T ension Adjustment.................................................................. 22
4.8 Condenser Cleaning (Air Cooled Freezers) ............................................. 23
4.9 Preventative Maintenance........................................................................ 23
4.10 Extended Storage ................................................................................... 23
4.11 Troubleshooting ....................................................................................... 24
Section 5 .............................................................................................................. 29
5.1 How to Order Replacement Parts ............................................................ 29
5.2 Parts Lists and Reference Drawings........................................................ 29
ILLUSTRATIONS
Figure 1 Model U421/U444 Series 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 3-way Tee..............................................................................7
Figure 9 Mix Inlet Tube & Probe Assy. Clip...........................................7
Figure 10 Hose Holder...........................................................................7
Figure 11 Operating Controls.................................................................9
Figure 12 Auger Flight Wear & Front Auger Support Bushing Wear .......12
Figure 13 Front Door Disassembly ........................................................13
Figure 14 Auger Flight Removal.............................................................13
Figure 15 Rear Seal Removal................................................................13
Figure 16 Rear Seal Lubrication ............................................................14
Figure 17 Spring Installation...................................................................14
Figure 18 Front Door Assembly .............................................................15
Figure 19 Air Bleed Valves ....................................................................16
Figure 20 Draining Sanitizer ..................................................................16
Figure 21 Refrigerated Cabinet .............................................................17
Figure 22 Mix Pumps.............................................................................18
Figure 23 Removable Parts ...................................................................19
Figure 24 Cleaning Air Tube..................................................................19
Figure 25 Cleaning Feed Tube ..............................................................19
Figure 26 Mix Pump Tube Routing .........................................................19
Figure 27 Potentiometer ........................................................................21
Figure 28 Overrun Adjustment................................................................21
Figure 29 Temperature Control Cab ......................................................22
Figure 30 Belt Adjustment......................................................................23
A Few Words About Safety
Safety Information
Read and understand the entire manual before
operating or maintaining Stoelting equipment.
This Owner's 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.
T o highlight specific safety information, the following
safety definitions 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 cont ains
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.
SECTION 1
INTRODUCTION
1.1 DESCRIPTION
The Stoelting U421 and U444 floor model freezers are pressure fed. The freezers are equipped with fully automatic
controls to provide a uniform product. The U421 freezer is
designed to operate with almost any type of commercial
soft serve. The U444 freezer is designed to dispense soft
Soft Serve
serve product from the left side and shake product from
the right side.
This manual is designed to assist qualified personnel and
operators in the installation, operation and maintenance
of the Stoelting Model U421 and U444 pressure freezer .
Soft Serve
Shake
Figure 1a. Model U421 Series Freezer
1.2 SPECIFICATIONS
Dimensions
width
height
depth
Weight
Electrical
minimum circuit
ampacity
maximum overcurrent
protection device
Int e r national O ption
Compressor
Drive M ot or
Cooling
Hopper Volum e
Freezing Cylinder
Volume
Production
Capacity
Figure 1b. Model U444 Series Freezer
U421/U431/ U 444 Water Cooled
Freezer
26-3/ 4'' (6 7, 9 cm )
65-3/ 4' ' (167,0 cm )
39-3/ 4' ' (101,0 cm )
760 lbs ( 344,7 kg)
1 PH
left right left right left right left right
wi t h c r ate
34'' ( 86,4 cm)
78'' (198,1 cm)
48'' (121,9 cm)
908 lbs ( 411,8 kg)
3 PH
U421/U431/U444 Air Cooled
Freezer
26-3/ 4' ' (67,9 cm )
67-3/ 4'' (1 72, 1 cm )
39-3/ 4'' (1 01, 0 cm )
785 lbs ( 356,0 kg)
wi th crate
34'' (8 6, 4 cm )
78'' (198,1 cm)
48'' (121,9 cm)
935 l bs (424,1 kg)
1 PH
3 PH
31A 31A 21A 21A 36A 31A 26A 21A
45A 45A 30A 30A 50A 45A 35A 30A
1 Phase , 220- 240 VAC, 50Hz or
3 Phas e, 380- 415 VAC, 50Hz
Tw o - 18, 000 Bt u/hr
Two - 2 hp
Water cooled units require 1/2" N . P. T.
wat er and drain f it t ings.
Air cool ed units require 3" (7, 6 cm) air
space on r ight, 10" ( 25, 4 c m) ab ove.
Tw o - 8 gal l o n (30,28 liters)
Two - 1.33 gallon ( 5 . 32 quart) , 5,4 lit er s
Soft Ser ve - 18 G PH (6 8, 14 liters)
Shak e - 27 G PH (102,21 liters)
1
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. Inst all 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 lifting 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
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