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
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 rot ation 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
through pump until hose adapter prevents further
feeding.
9.Turn pump off.
10.Connect free end of mix pump hose to 3-way Tee
756204
375867
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.
264241
756088
756067
1172864
1151965
756088
696130
756088
376041
694247
762256
Figure 7. Mix Pump
6
ÅÅ
Å
ÅÅ
Large Port
(Air/Mix)
Figure 8. 3-way Tee
ÆÆ
Æ
ÆÆ
Refrigerated
Mix Transfer
Line
3-way Tee
ÅÅ
Å
ÅÅ
ÇÇ
Ç
ÇÇ
Hose Holder
Low Mix Cord
ÌÌ
Ì
ÌÌ
Cover
ÈÈ
È
ÈÈ
Mix
Container
Figure 9. Mix Inlet Tube & Probe Assy. Clip
ÉÉ
É
ÉÉ
Retainer
Clip
Figure 10. Hose Holder
7
8
SECTION 3
INITIAL SET-UP AND OPERATION
3.1 SAFETY PRECAUTIONS
SAFE OPERATION IS NO ACCIDENT; observe these
rules:
A. Know the freezer. Read and understand the operat-
ing instructions.
B. Notice all warning labels on the freezer.
C. Wear proper clothing. Avoid loose fitting garments,
and remove watches, rings or jewelry which could
cause a serious accident.
D. Maint ain a clean work area. Avoid accidents by
cleaning the area and keeping it clean.
E. Stay alert at all times. Know which switch, push
button or control you are about to use and what
effect it is going to have.
F. Disconnect electrical power for maintenance.
Never attempt to repair or perform maintenance on
the freezer until the main electrical power has been
disconnected.
G. Do not operate under unsafe operating condi-
tions. Never operate this freezer if unusual or exces-
sive noise or vibration occurs.
3.2 OPERA TING CONTROLS AND INDICA T ORS
Before operating the freezer, it is required that the operator know the function of each operating control. Refer
to Fig.1 1 for the location of the operating controls on the
freezer.
WARNING
Hazardous voltage
The CLEAN-OFF-ON switch must be placed in the OFF
position when disassembling for cleaning or servicing.
The freezer must be disconnected from electrical
supply before removing any access panel. Failure to
disconnect power before servicing could result in
death or serious injury.
A. Spigot Switch
When the spigot handle is opened the SPIGOT
switch will start the auger drive and refrigeration
systems. When the spigot handle is closed, the drive
motor and compressor will remain on until the product
in the barrel reaches the proper temperature.
B. Clean-Off-Serve Switch
The CLEAN-OFF-SERVE switch is a three position
toggle switch used to control the operation of the
refrigeration system and auger. When the switch is
placed in the CLEAN position, the refrigeration system will be off and auger will rotate for cleaning.
Figure 11. Operating Controls
9
When the switch is placed in the OFF position, the
refrigeration system and auger will not operate.
When the switch is placed in the SERVE position,
the refrigeration system and auger will operate auto-
matically. The switch should be placed in the SERVE
position for normal operation.
C. Cabinet-Off-On Switch
The CABINET-OFF-ON switch is a two position
toggle switch. When the switch is placed in the OFF
position, the lower cabinet refrigeration system will
not run. When the switch is placed in the ON
position, the lower cabinet refrigeration system will
run until the preset temperature is reached; then
cycle ON and OFF to maintain that temperature.
D. Cab Indicator Light
A flashing light indicates the cab OFF-ON switch is
in the OFF position, no refrigeration. Place the OFF-
ON switch in the ON position for cab refrigeration.
E. Pump Switch
The pump motor switch is a two position toggle
switch. When the switch is placed in the OFF
position, the pump will not run. When the switch is
placed in the ON position, the pump will run until the
preset pressure is reached, then cycle ON and OFF
as product is drawn to maintain that pressure.
F. Standby/Serve Switch
The standby/serve switch is a two position toggle
switch. When the switch is placed in the standby
position the freezer will cycle to maintain a tempera-
ture below 41°F (-15°C). When the switch is in the
Serve position the freezer will cycle to maintain a
servable product.
G. Freezing Switch
The freezing switch is a two position toggle
switch. When the switch is placed in the MAXIMUM
position the freezer will be forced to run 30 seconds
after the temperature control is satisfied.
H. High Head Pressure Cut Out
If the head pressure exceeds 445 psig (28 bar) air
cooled andwater cooled, the high head pressure
cutout will trip. The reset button can be accessed
from the side of the freezer.
I. Low Mix Light
The low mix light will illuminate when the liquid level
in the mix container drops below two gallons.
J. Front Door Safety Switch
The front door safety switch prevents the auger from
turning when the front door is removed. The switch
is open when the door is removed and closed when
the door is properly installed.
10
3.3 IMPORTANT INFORMATION REGARDING
CLEANING AND SANITIZING
Soft serve and shake freezers require special
consideration when it comes to food safety and
proper cleaning and sanitizing.
The following information specifically covers issues
for cleaning and sanitizing frozen dessert freezers.
This information is meant to supplement a
comprehensive food safety program.
Soil Materials Associated with Frozen Dessert
Machines
CLEANING
· Is the removal of soil materials from a surface.
· Is a prerequisite for effective sanitizing.
NOTE
An UNCLEAN surface will harbor bacteria that can
defy sanitizing efforts.
Bacteria can develop and resist sanitizing efforts
within a layer of soil material (milkstone). Thorough
cleaning procedures that involve milkstone
removal are critical for operators of frozen
dessert machines.
MILKFAT/BUTTERFAT – As components of icecream/frozen custard mix, these soils will
accumulate on the interior surfaces of the machine
and its parts. Fats are difficult to remove and help
attribute to milkstone build-up.
MILKSTONE – Is a white/gray film that forms on
equipment and utensils that come in contact with
dairy products. These films will accumulate slowly
on surfaces because of ineffective cleaning, use of
hard water, or both. Milkstone is usually a porous
deposit, which will harbor microbial
contaminants and eventually defy sanitizing
efforts.
Once milkstone has formed, it is very difficult to
remove. Without using the correct product and
procedure, it is nearly impossible to remove a thick
layer of milkstone.
(NOTE: general-purpose cleaners DO NOT remove
milkstone.) This can lead to high bacteria counts
and a food safety dilemma.
IT IS BEST TO CONTROL MILKSTONE ON A
DAILY BASIS BEFORE IT CAN BECOME A
SIGNIFICANT FOOD SAFETY PROBLEM.
In addition to food safety, milkstone can cause
premature wear to machine parts which can add to
costs for replacement parts or possibly more
expensive repairs if worn machine parts are not
replaced once they have become excessively worn.
Important Differences Between Cleaning and
Sanitizing
CLEANING vs. SANITIZING
It is important to distinguish between cleaning and
sanitizing. Although these terms may sound
synonymous, they are not. BOTH are required for
adequate food safety and proper machine
maintenance.
SANITIZING
· Kills bacteria.
· Can be effective on clean surfaces only.
· DOES NOT clean or remove milkstone.
NOTE
Using a SANTITIZER on an unclean surface
will not guarantee a clean and safe frozen
dessert machine.
Proper Daily Maintenance:
The Only Way to Assure Food Safety and
Product Quality
Proper daily maintenance can involve a wide variety
of products and procedures. Overall, the products
and procedures fall into three separate categories.
(Please note that this is a brief overview intended for
informational purposes only.)
1. CLEANING – This involves draining mix from the
freezer barrel and rinsing the machine with
water. Next, a cleaner is run through the
machine. Then, the machine is disassembled
and removable parts are taken to the sink for
cleaning.
2. MILKSTONE REMOVAL – Since almost all
cleaners do not have the ability to remove
milkstone, the use of a delimer becomes
necessary. Although this procedure may not be
needed on a daily basis, it will usually follow the
cleaning procedure. It requires letting a delimer
solution soak in the machine for an extended
period of time. Individual parts are also soaked
in a deliming solution for an extended period of
time (more about delimers in Additional
Information).
3. SANITIZING – After the machine has been
cleaned and contains no milkstone, the
machine is reassembled. Then a FDA-approved
sanitizing solution is run through the machine to
kill bacteria. The machine is then ready for food
preparation.
11
As a recommended cleaner and sanitizer for your
frozen dessert machine, STERA-SHEEN has proven
to be one of the best daily maintenance products for:
· CLEANING – Thorough removal of all solids
including butterfat and milk fat.
The ideal concentration of chlorine needs to be 100
ppm (as stated by the FDA).
NOTE
Follow the directions on the container for proper
concentration.
· MILKSTONE REMOVAL – Complete removal of
milkstone.
· SANITIZING – FDA-approved no rinse sanitizer
for food contact surfaces.
Additional Information
THE USE OF DELIMERS
A delimer is a strong acid that has the ability to
dissolve milkstone. This type of chemical may
become necessary once high levels of milkstone
have developed. While these products are very
effective for removing HIGH levels of milkstone, they
are not ideal for two reasons:
1. PRODUCT SAFETY – Strong acids are
dangerous chemicals and handling them
requires safety
2. MACHINE DAMAGE – Strong acids will attack
metal and rubber causing premature wear of
parts. The use of a delimer needs to be closely
monitored to avoid damage to machine surfaces
and parts.
There are two main factors that contribute to falling
chlorine concentrations in a sanitizing solution.
1. PRODUCT USE – As the chlorine in the
solution is being used, chlorine concentrations
fall.
2. TIME – As time passes, small amounts of
chlorine “evaporate” from the solution. (That is
why you can smell it.)
Sanitizing solutions should not be allowed to fall
below 100 ppm chlorine. New solutions should be
mixed once old solutions become ineffective.
3.4 DISASSEMBL Y OF FREEZER P ARTS
WARNING
Moving machinery can grab, mangle and dismember. Place the CLEAN-OFF-SERVE toggle
switch in the OFF position before disassembling
for cleaning or servicing. Placing the CLEAN-OFFSERVE toggle switch in the SERVE position during cleaning or servicing may result in serious
personal injury.
With proper daily use of STERA-SHEEN or it’s
equivalent, there is
DELIMER.
DO NOT USE BLEACH
· BLEACH HAS ABSOLUTELY NO CLEANING
PROPERTIES.
· BLEACH IS CORROSIVE. It can and will
damage components of the machine causing
premature wear and metal corrosion.
GENERAL PURPOSE CLEANERS
General purpose cleaners do not have the ability to
remove milkstone. Milkstone will become a problem
if not remedied with additional products and
procedures.
THE USE OF CHLORINE TEST STRIPS
“Test strips” are used to determine concentrations of
active chlorine in sanitizing solutions. To use the
strips, tear off a small portion and submerge it into
the sanitizing solution. Then, compare the color
change to the color key on the side of the test strip
dispenser to determine the approximate chlorine
concentration.
no need for the use of a
Before using the freezer for the first time, complete freezer
disassembly, cleaning and sanitizing procedures will need
to be followed. Routine cleaning intervals and procedures
must comply with the local and state health codes.
Inspection for worn or broken parts should be made at
every disassembly of the freezer for cleaning or other
purposes. All worn or broken parts should be replaced to
ensure safety to both the operator and the customer and
to maintain good freezer performance and a quality product. Two normal wear areas are the auger flights and front
auger support bushing (see Figure 12).
T o disassemble the freezer , refer to the following steps:
Wear Line
ÈÈ
È
ÈÈ
Figure 12. Auger Flight Wear & Front Auger
Support Bushing Wear
12
A. Disassembly Of Front Door
1. Remove the front door by turning off the black
knobs and then pulling the front door off the studs.
2. Remove the air bleed valve by unscrewing the
knob while holding the valve stem from behind.
Removethe compression spring and push air
bleed valve through the rear of the front door.
3. Remove the spigot through the bottom of the front
door (see Figure 13). Remove all O-rings from
spigot and air bleed valve.
Figure 13. Front Door Disassembly
B. Disassembly Of Auger
1. Remove the front auger support by pulling it
straight out of the freezer barrel.
2. Remove the plastic bearing from the front auger
support.
Figure 15. Rear Seal Removal
3.5 CLEANING DISASSEMBLED PARTS
Disassembled freezer parts require complete cleaning,
sanitizing and air drying before assembling. Local and
state health codes will dictate the procedure required.
Some state health codes require a four sink process (prewash, wash, rinse, sanitize, air dry), while others require
a three sink process (without the pre-wash step). The
following procedures are a general guideline only. Consult
your local and state health codes for procedures required
in your location.
A. To clean the freezer parts, disassemble all parts.
(Refer to section 3.4 for the disassembly of freezer
parts.)
B. Place all front door and auger parts in clean 90° to
110°F (32°C to 43°C) water and wash thoroughly
(four sink procedure only).
C. Place all parts in 90° to 110°F (32°C to 43°C) , mild
detergent water and wash thoroughly.
3. Remove the auger by pulling slowly and rotating
out of the freezer barrel. As the auger is
withdrawn, remove each plastic flight and spring
from the auger. Be careful not to scratch inside of
freezer barrel when removing flights or auger .
Remove the spring from each auger flight.
Figure 14. Auger Flight Removal
4. Keep the rear of the auger tipped up once it is
clear of the freezer barrel.
5. Wipe spline lubricant off hex end of auger with a
paper towel. Remove the rear seal. Figure 15.
D. Rinse all parts with clean 90° to 110°F (32°C to
43°C) water.
F. Sanitize all freezer parts following procedures out
lined below.
3.6 SANITIZE FREEZER PARTS
A. Use a sanitizer mixed according to manufacturer's
instructions to provide a 100 parts per million strength
solution. Mix sanitizer in quantities of no less than 2
gallons of 90° to 110°F (32°C to 43°C) water. Allow
the sanitizer to contact the surfaces to be sanitized
for 5 minutes. Any sanitizer must be used only in
accordance with the manufacturer's instructions.
B. Place all parts in the sanitizing solution for 5 minutes,
then remove and let air dry completely before assem
bling in freezer.
13
3.7 CLEANING THE FREEZER
CAUTION
Risk of Product Damage
Do not use acid cleaners, strong caustic compounds
or abrasive materials to clean any part of the freezer
exterior or plastic parts.
The exterior should be kept clean at all times to
preserve the lustre of the stainless steel. A good
grade of stainless steel has been used on the
freezer to ease clean-up. To remove spilled or dried
mix, simply wash the exterior in 90° to 110°F (32°C
to 43°C) , soapy water and wipe dry.
É
ÉÉ
ÉÉ
Lubricate
with
Socket
ÊÊ
Ê
ÊÊ
ÉÉ
É
ÉÉ
ÉÉ
É
ÉÉ
Lubricate with Petrogel
Figure 16. Rear Seal Lubrciation
C. Lubricate the hex drive end of auger with a small
amount of white socket lubricant. A small container
of socket lubricant is shipped with the freezer.
Lubricant
Do not use highly abrasive materials as they will
mar the finish. A mild alkaline cleaner is recommended. Use a soft cloth or sponge to apply the
cleaner. For best results, wipe in the direction of the
grain of the steel.
A. Clean the rear seal surface from inside of the freezer
barrel.
B. Using this sanitizing solution and the large barrel
brush provided, sanitize the barrel by dipping the
brush in the sanitizing solution and brushing the
inside of the barrel.
C. Remove the rear drip tray by pulling from side panel.
Clean and replace drip tray.
3.8 ASSEMBLING FREEZER
To assemble the freezer parts, refer to the following steps:
NOTICE
Petro-Gel sanitary lubricant or equivalent must be
used when lubrication of freezer parts is specified.
NOTICE
The United States Department of Agriculture and
the Food and Drug Administration require that lubricants used on food processing equipment be certified for this use. Use Lubricants only in accordance
with the manufacturer's instructions.
A. Assemble all O-rings onto parts dry, without lubri-
cation. Then apply a thin film of sanitary lubrication
to exposed surfaces of the O-rings.
B. Lubricate rear seal area on auger shaft with a thin
layer of sanitary lubricant. Install the rear seal O-ring.
Lubricate outside of rear seal O-ring with sanitary
lubricant.
C. Install stainless steel rear seal adapter into rear seal
dry (without lubricant). Lubricate inside surface of
rear seal adapter and install onto auger shaft. DO
NOT lubricate outside of rear auger seal (see Figure
16).
D. Screw the springs onto the studs in plastic flights.
Spring must be screwed into the flights completely to provide proper tension (see Figure 17).
Figure 17. Spring Installation
E. Install first flights to bottom of auger, rotate, add
successive flights from bottom as the auger is pushed
slowly into the freezer barrel. Carefully engage auger
with drive socket in speed reducer by rotating auger
slowly and pushing on end of auger.
F. Apply a thin film of sanitary lubricant to the inside and
outside of the front auger support bearing, then place
on the front of the auger. Assemble the front auger
support onto the auger bearing.
NOTICE
Position the front support on auger so legs do not
interfere with the pin on the back of the front door
assembly. Front door must push auger in slightly
when it is being tightened to prevent the rear seal
from leaking.
14
G. Assemble O-rings onto the spigot dry, without
lubrication. Then apply a thin film of sanitary lubricant
to the outside of the O-rings and spigot bodies.
H. Install the spigot through the bottom of the front
door ( see Figure 18).
Figure 18. Front Door Assembly
I. Assemble the air bleed valve O-ring onto the air
bleed valves. Position the O-ring in groove close to
the wide part. Apply a thin film of sanitary lubricant to
the O-rings.
J. Insert the air bleed valve from the back of the front
door. Install compression springs onto air bleed
valves, then screw knobs on finger tight.
K. Apply a thin film of sanitary lubricant to the door seal
O-rings, and fit into the grooves on the rear of the
front door.
L. Place the front door assembly on the mounting studs
and push front door against the freezer carefully.
M. Secure front door assembly by placing the knobs on
the studs and tighten until finger tight only. Do not
overtighten. ProperO-ring seal can be observed
through the transparent front door.
N. Move the spigot handles to the closed position.
15
3.9 SANITIZING
Sanitizing must be done after the freezer is clean and just
before the freezer is filled with mix. Sanitizing the night
before is not effective. However, you should always clean
the freezer and parts after using it.
WARNING
The United States Department of Agriculture and
the Food and Drug Administration require that
all cleaning and sanitizing solutions used with
food processing equipment be certified for this
use.
When sanitizing the freezer, refer to local sanitary regulations for applicable codes and recommended sanitizing
products and procedures. The frequency of sanitizing must
comply with local health regulations. Mix sanitizer according to manufacturer’s instructions to provide a 100
parts per million strength solution. Mix sanitizer in quantities of no less than 2 gallons of 90°F to 110°F 90° to
1 10°F (32°C to 43°C) water. Allow sanitizer to contact the
surfaces to be sanitized for 5 minutes. Any sanitizer must
be used only in accordance with the manufacturer’s instructions.
C. Let sanitizing solution fill the freezer barrel to air bleed
valve, then close the valve by pulling out to lock in
place.
D. Place the CLEAN-OFF-SERVE toggle switch in
the CLEAN position.
Figure 20. Draining Sanitizer
E. Check for leaks when the freezer barrel is first
pressurized with sanitizing solution.
1. Check for leaks at the plastic front door, the
O-rings may not be sealed.
Air Bleed Valves
Figure 19. Air Bleed Valves
CAUTION
Risk of Product Damage
Avoid prolonged contact of sanitizer with freezer parts.
Prolonged contact of sanitizer with freezer may cause
corrosion of stainless steel parts.
2. Check the drain located at the center of the
Drip Tray for leaks coming from the rear of the
Rear Auger Seal.
3. Check inside cab unit for leaks at hose connections.
F. Using a sanitized soft bristle brush or equivalent,
dipped in sanitizing solution, clean mix container .
G. After five minutes, open spigot to expel sanitizing
solution. Drain all solution from freezer using both
spigots (See Figure 20).
H. Close the spigot and place the mix pump switch
and the CLEAN-OFF-SERVE switch in the OFF
position.
The freezer is now sanitized and ready for adding mix.
3.10 INITIAL FREEZE DOWN AND OPERA TION
This section covers the recommended operating procedures to be followed for the safe operation of the freezer.
A. Sanitize just prior to use according to instructions
outlined in this manual.
A. Prepare 3 gallons of sanitizing solution following
manufacturer's instructions, and pour into storage
container .
B. Place the mix pump switch in the ON position and
open air bleed valve on the front door by pushing
valve in and holding (see Figure 19).
B. Prepare the desired amount of mix and then fill each
storage container with approximately 3 gallons or
more of mix. Place a container(s) of mix in the refrigerated cabinet. If drawing from a storage container ,
place the draw tube through the cover to the bottom
of the container . If drawing from a bag in a box, remove the cap, push out all of the air, and insert the
adaptor.
16
Mix Low
Sensor
Figure 21. Refrigerated Cabinet
C. Place the mix pump switch in the ON position. Im
mediately open the spigot and let approximately 8
ounces of liquid mix with sanitizing solution drain
out of the spigot.
D. Close the spigot and open the air bleed valve on the
front door by pushing the valve in and holding. Allow
the barrel to fill until the mix level is 1/2" (2.7 cm)
below air bleed valve, then release valve and pull
closed to lock in place.
E. Start the compressor and drive by placing the
CLEAN-OFF-SERVE switch in the SERVE position
F. The product will be ready to serve after the compres-
sor and drive have cycled off, or in approximately 12
minutes.
G. The refrigeration is automatically actuated when the
spigot is opened. For normal dispensing, open the
spigot no more then 90°. (This is when the handle
knob is pointed directly away from the front door.)
This position provides excellent control over the product and aids in making desired shaped portions.
Close spigot completely after dispensing.
The freezer is designed to dispense the product at a
reasonable draw rate. If the freezer is overdrawn, the
result will be a soft product and air pops. If this should
occur, allow the freezer to run for approximately 30
seconds before dispensing additional product. Af ter a
while the operator will sense or feel when the freezer is
beginning to fall behind, and will slow down on the rate of
draw so as not to exceed the freezer's capacity .
Do not operate the freezer when the MIX LOW light is
on or with less than 1-3/4" (4.4 cm) of mix in the
mix container. Refill the mix cont ainer immediately.
3.11 MIX INFORMATION
Mix can vary considerably from one manufacturer to
another. Differences in the amount of butter-fat content and
quantity and quality of other ingredients have a direct
bearing on the finished frozen product. A change in freezer
performance that cannot be explained by a technical
problem may be related to the mix.
Proper product serving temperature varies from one
manufacturer's mix to another. Soft serve mixes should
provide a satisfactory product in the 17° to 20°F (-7° to
-6°C) range. Most shake mixes freeze to proper consistency at 27°F (-2.8°C). Diet and low-carb mixes typically
freeze to proper consistency at higher temperatures.
When checking the temperature, stir the thermometer in
the frozen product to read the true temperature.
Mix does not improve with age. Old mix, or mix that has
been stored at too high a temperature, can result in a
finished product that is less than satisfactory from the
appearance and taste standpoint. To retard bacteria
growth in dairy based mixes, the best storage temperature
range is between 36° to 40°F (2.2° to 4.4° C).
17
3.12 OPERATION OF MIX PUMP
The pump switch is located on the front of the freezer.
When the pump switch is placed in the ON position, the
mix pump motor will be actuated to pump mix into the
freezer cylinder. When the set pressure is reached, the
mix pump will shut off automatically. When the switch is
placed in the OFF position, the mix pump will be inoperative.
NOTE
The mix pump motor is equipped with an internal
overload that will “trip”, disabling the pump when the
motor is overloaded. Consult the trouble shooting
section for corrective information.The internal overload will automatically reset after cooling. If the condition continues, contact a qualified service person.
CAUTION
C. The over-run adjustment is preset at the factory. If an
adjustment becomes necessary, refer to Section 4.
NOTICE
Any cleaning procedure must always be followed
by sanitizing before filling freezer with mix. (Refer to
section 3.3)
3.13 MIX PUMP CLEANING
The mix pump is approved for CIP (clean in place) and is
thoroughly cleaned as cleaning solutions are pumped thru
the freezer. We recommend completely disassembling
the pump and connecting tubing every 14 days for inspection
of parts to confirm the CIP has been properly performed. If
any residue is detected clean or replace those parts as
outlined below.
1. Place CLEAN-OFF-SERVE switch in CLEAN position. Allow the auger to agitate for 5 to 10 minutes.
Risk of Product Damage
Mix pump hose must be repositioned every 1 -2 weeks
or 60 hours of operation. Failure to comply will result
in reduced mix pump liquid capacity , dispense stoppage, popping, and possible mix pump hose leakage. Hose leakage may damage the pump roller assembly and void the factory warranty .
A. Mix Operation: The peristaltic mix pump contains
one continuous mix pump hose. When looking at the
face of the peristaltic mix pump, the left side of the
hose is the suction or pickup. The right side of the
hose is the discharge. Mix is drawn up the suction
side of the hose and transferred thru the discharge
side to the freezer (see Figure 22).
B. Air Operation: The air compressor operates whenever
the peristaltic mix pump is running. Air enters thru a
check valve on the piston downstroke. The air is
discharged thru a second check valve, on the piston
upstroke. The air and mix join at the tee and then
travel to the freezer.
2. Remove suction tube from mix container. Draw off the
mix remaining in freezer barrel.
3. Pump 2 gallons (7.5 liters) of cold potable water thru
freezer until water at spigot is free of mix.
4. Pump 2 gallons (7.5 liters) of 90° to 110°F (32°C to
43°C) detergent solution water thru freezer. The use
of soft water is recommended, along with dishwashing
detergents such as “Joy ,” “Dawn,” or equivalent.
5. Place mix pump switch in OFF position. Open spigot
to relieve remaining pressure.
6. Place CLEAN-OFF-SERVE switch in OFF position.
3.14 DISASSEMBLY AND INSPECTION OF
REMOVABLE PARTS
Inspection of removable parts should be made whenever
maintenance is performed or pump requires disassembly.
Mix
Intake
ÆÆ
Æ
ÆÆ
Figure 22. Mix Pumps
Mix
Discharge
ÆÆ
Æ
ÆÆ
ÆÆ
Æ
3-way Tee
ÆÆ
ÆÆ
ÆÆ
Æ
Hose
Holder
WARNING
Hazardous Moving Parts
Revolving pump head can grab, mangle, and cause
serious crushing injury. The Power switch must be
placed in the OFF position for cleaning and power
must be disconnected when disassembling or
servicing.
CAUTION
System Under Pressure
Never disconnect hoses from freezer or pump without
first opening spigot to relieve pressure.
18
NOTE
If the mix lines or air line is difficult to remove, soften
with a rag soaked in hot water. Hose connections
may be sprayed with Haynes Sanitary Lubricant for
ease of removal. Do not loosen or remove the mix
pump cover wingnuts. Maintain the mix pump hose
in its operational condition.
1. Loosen clamp and remove air hose from pump
compressor.
2. Loosen clamp and disconnect mix pump hose.
Remove the pickup hose, mix check valve and pickup
hose adapter (and bag adapter if applicable) as an
assembly from mix container .
9. Sanitize assembled freezer as per instructions
outlined in Section 3.9).
3. Completely disassemble both hose assemblies and
check valve. Place hoses, tee, check valve assembly , and pickup hose adapter in 90° to 1 10°F (32°C to
43°C), mild detergent water and wash thoroughly . Use
soft bristle brushes to clean inside of fittings. Rinse
all parts in clean 90° to 1 10°F (32°C to 43°C) water
(see Figure 23).
4. Carefully inspect each part for wear or damage.
Replace worn or damaged parts.
5. Wash feed tube and air tube with 90° to 110°F detergent water and brushes provided. Rinse with clean,
90° to 1 10°F water (See Figure 24 and 25).
6. Prepare two gallons (7.5 liters) of sanitizing solution
using a USDA certified grade sanitizing solution.
Sanitize all removed parts, then air dry .
7. Check Hose Service Record decal to determine if
hose
reposition or replacement is required at this
time.
8. Reassemble both hose assemblies per the diagram
located on the inside of the cab door. Reconnect
assemblies to the pump and discharge hose, using
the clamps. (See Figure 26 or refer to Section 2.5
Mix Pump).
Figure 24. Cleaning Air Tube
Figure 25. Cleaning Feed Tube
Pump
Compressor
Figure 23. Removable Parts Figure 26. Mix Pump Tube Routing
19
20
SECTION 4
MAINTENANCE INSTRUCTIONS
4.1 FREEZER ADJUSTMENT
This section is intended to provide maintenance personnel with a general understanding of the freezer adjustments. It is recommended that any adjustments in this
section be made by a qualified person.
4.2 PRODUCT TEMPERATURE ADJUSTMENT
A potentiometer is used to control the product temperature. To change the temperature of the product, follow the
steps below:
A. Loosen the two screws under the header display
sign, then pull sign out and down.
B. Use a screw driver to make desired adjustment. A
label near the potentiometer will give complete instructions (see Figure 26).
The mix pump that fills the left freezing cylinder of the U444
has been preset at the factory to produce a soft serve
product with approximately 40% overrun. The mix pump
that fills the right freezing cylinder of the U444 has been
preset at the factory to produce a shake product with
approximately 50% overrun. The left and right pumps on
the U421 have been preset to produce a soft serve product
with approximately 40% overrun. Because of differences
in mix formulation, temperatures and barometric pressure,
this figure may vary. It will be necessary for approximately
2 gallons (7,5 liters) of mix to be pumped thru the freezer
before changes in the product are noticeable due to
adjustments in overrun.
Overrun is controlled by the length of the air compressor
piston stroke within the piston cylinder. Lengthening the
stroke within the cylinder will increase overrun. Conversely, shortening the stroke will decrease overrun. To
perform an overrun adjustment, refer to the following
procedure:
A. Turn the mix pump switch to the OFF position .
B. Remove the lower back panel from freezer.
Figure 27. Potentiometer
4.3 OVERRUN ADJUSTMENT
The product when served is a combination of air and mix.
Overrun is a measure of the amount of air blended into the
mix.
Overrun can be expressed in terms of the amount of
weight loss for a given volume. For example, if a pint of
liquid mix weighs 18 ounces (510 grams) and a pint of
frozen product with air added weighs 12 ounces (340
grams), the overrun is said to be 50 percent "18 oz. (510
grams) - 12 oz. (340 grams) = 6 oz. (170 grams)", (6 /12)
x 100 = 50%.
The overrun can be checked by placing a one pint
container on an ice cream scale and zeroing out the scale.
Then fill a one pint container with frozen product. The
container should be filled over the top and leveled with a
straightedge. The product should not contain any air
pockets. When weighed on an ice cream scale, one pint
(473 milliliters) of product should weigh 12 to 13 ounces
(340 to 368,5 grams) for an overrun of 45 to 50%.
C.
On air compressor side of pump, locate the long/
slender piston rocking arm. The rocking arm downward travel is limited by a stationery cam. On the face
of the cam there is an overrun setting indicator plate
numbered 3 thru 8 and an adjustment knob (see
Figure 27).
ÊÊ
Ê
Overrun Adjustment
Figure 28. Overrun Adjustment
D.The overrun setting is indicated by a pointed pin.
E. T o adjust overrun, loosen the allenhead screw
(located within the center of the adjustment knob)
with the 5/32" (4mm) allen wrench provided. Rotate
the adjustment knob counterclockwise to a higher
number for higher overrun, or clockwise to a lower
number for lower overrun. Each number multiplied by
10 represents the overrun percentage (ie: #4 = 40%
overrun).
21
ÊÊ
F . Tighten the allen screw, then place the wrench back
in its clip. Replace the lower back panel and secure
with the four screws. Turn the mix pump power switch
to the ON position.
4.4. MIX PUMP HOSE REPOSITION (every one or
two weeks.)
NOTICE
Mix pump hose must be repositioned every 1 - 2
weeks. Failure to comply will result in reduced mix
pump liquid capacity , dispense stoppage, popping,
and possible mix pump hose leakage.
1. Run cleaning solution through pump.
2. Turn pump off and relieve any pressure by
opening the spigot.
3. Grasp the pick-up hose end of the mix pump
hose with one hand and turn the pump on. Pull
down on the pick-up hose end until 12 to 14"
(30-1/2 to 35-1/2cm) of tubing has reverse fed
through the pump, then turn the pump off.
4. Loosen small clamp at the pick-up hose
adapter and (Viewed from Back) disconnect
mix pump hose.
5. Cut 7-1/2" (19 cm) off the end of the mix pump
hose.
6. Reconnect mix pump hose to adapter.
7. Continue normal operation. Mix hose will
automatically reposition itself with adapter near
black cover .
CAUTION
UTION
Never disconnect hoses from freezer or pump without first opening spigot to relieve pressure.
3. Disconnect mix pump hose at each end.
4. Grasp the discharge hose end with one hand
and turn the pump on. Pull down on the hose
until all of the remaining hose is removed from
the pump.
5. Connect new mix pump hose to pick-up hose
adapter, using small clamp.
6. Insert free end of hose into the pick-up (suction
side) hose side of the black cover . Gently push
the hose into the black cover until it begins to
self-feed. Allow the hose to feed itself through
the pump until the pick-up hose adapter prevents further feeding, then turn the pump off.
7. Reconnect mix pump hose to T using small
clamp. Pump is now ready to sanitize.
4.6 CAB TEMPERA TURE ADJUSTMENT
A temperature control is used to control cab temperature.
To change the temperature, follow the steps below:
A. Remove the six screws holding the left side panel
and remove panel.
B. Use a small screwdriver to adjust the temperature
control. Turn counterclockwise for a warmer temperature and clockwise for a colder temperature. It
will take about an hour for the cab temperature to
change. Figure 28.
C. Install side panel and secure with the six retaining
screws.
NOTICE
Each hose is long enough for 3 repositions before
replacement is required. Record each event on
Hose Service Record decal.
4.5 MIX PUMP HOSE REPLACEMENT
NOTICE
Mix pump hose must be replaced when tubing cannot be further repositioned (every four to eight
weeks). Failure to comply will result in hose failure
and possible pump damage.
1. Run cleaning solution through pump.
2. Turn pump off and relieve any pressure by
opening the spigot.
W ARNING
The Mix pump switch must be in the "Off" position
when servicing or cleaning pumps.
Figure 29. Temperature Control Cab
4.7 DRIVE BELT TENSION ADJUSTMENT
To check belt tension, refer to Figure 29 and follow the
steps below:
WARNING
Disconnect electrical supply to freezer before servicing.
22
A. Remove either side and back panels.
B. Press firmly on one belt. Figure 29.
Figure 30. Belt Adjustment
NOTICE
If the condenser is not kept clean, loss of refrigeration efficiency will result.
4.9 PREVENTATIVE MAINTENANCE
It is recommended that a preventative maintenance schedule be followed to keep the freezer clean and operating
properly. The following steps are suggested as a preventative maintenance guide.
WARNING
Never attempt to repair or perform any maintenance
on freezer until all main electrical power has been
disconnected.
The United States Department of Agriculture and the Food
and Drug Administration require that lubricants used in
food zones be certified for this use. Use lubricants only in
accordance with the manufacturer's instructions.
C. When the tension is properly adjusted, the outside
of the depressed belt should be approximately in
line with the inside of the other belt.
D. If an adjustment is necessary, loosen the four motor
plate retaining nuts, adjust belt tension then re
tighten the four nuts.
NOTICE
Belt life will be increased if new drive belts are tightened after two or three weeks of operation.
4.8 CONDENSER CLEANING (AIR-COOLED
FREEZERS)
The condenser requires periodic cleaning. To clean the
condenser, refer to the following steps:
NOTICE
Some freezers have a condenser filter, to clean remove and wash in warm soapy water. Rinse in clean
water and shake dry, taking care not to damage
filter in any way .
A. Visually inspect the condenser for dirt.
B. If the condenser is dirty, place a wet towel over the
condenser.
C. Using compressed air or CO2 tank, blow out the dirt
from the back of the condenser. Most of the dirt will
cling to the wet towel.
CAUTION
A. Daily Checks
Check for any unusual noise or condition and repair
immediately.
B. Month Checks
1. Check drive belts for wear and tighten belts if
necessary. (Refer to Section 4.7.)
2. Check the condenser for dirt. (Refer to Section
4.8).
WARNING
Never attempt to repair or perform any maintenance
on freezer until all main electrical power has been
disconnected.
4.10 EXTENDED STORAGE
Refer to the following steps for winterizing the freezer or for
storing the freezer over any long period of shutdown time.
A. Clean thoroughly with warm detergent all parts that
come in contact with mix. Rinse in clear water and
dry all parts. Do not sanitize.
NOTICE
Do not let cleaning solution stand in freezer barrel
or mix pump during the shutdown period.
B. Remove, disassemble, and clean the front door,
auger shaft, and mix pump. Leave disassembled
during the shutdown period.
This procedure emits a loud noice. Wear hear protection to prevent hearing loss.
D. An alternative method is to clean with a con-
denser brush and vacuum.
C. Place plastic auger flights in a plastic bag with a
moist paper towel. This will prevent flights from
becoming brittle if exposed to dry air over an
extended period of time (over 30 days).
23
D. For water-cooled freezers that are left in unheated
buildings, or buildings subject to freezing, the water
must be shut off and disconnected. Disconnect
fittings at water valve inlet and water outlet lines at
the freezer. The fittings are located at the rear of the
freezer. Run the compressor for 2 - 3 minutes to
open water valve. Blow out all water, first through
water inlet, then through water outlet lines with air or
carbon dioxide. Also drain water supply line to the
freezer.
E. Place the mix pump ON-OFF switch, and the
CLEAN-OFF-SERVE switch in the OFF position.
F. Disconnect from the source of electrical supply in
the building.
4.11 TROUBLESHOOTING
The Troubleshooting Table lists the common problems
that can occur to the freezer.
24
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25
MIX PUMP
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26
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27
28
SECTION 5
HOW TO ORDER REPLACEMENT PARTS
5.1 HOW TO ORDER REPLACEMENT PARTS
To assure the receipt of the proper replacement parts,
supply your Authorized Stoelting Distributor with the
following information:
A. Model number of equipment.
B. Serial number of model (stamped on nameplate)
C. Part number, part name, and quantity needed.
NOTICE
Minimum billing is $50.00 Net.
5.2 PARTS LIST AND REFERENCE DRAWINGS
The following lists and drawings will aid the user when
ordering parts or servicing.
29
FRONT DOOR P ARTS
Drawing
Index No. Part No. Description
7 625133 O-ring, Front Door
11 624520 O-ring, Air Bleed Valve
12 694200 Spring, Air Bleed Valve
13 482004 Knob, Air Bleed, Black
14 2 110 116 Stem, Air Bleed Valve
15 1107123 Spigot Handle
16 570998 Retaining Pin
17 2146293 Spigot Extension, 2.1
2157892 Spigot Extension, 1.5
2143024 Spigot Extension, 3.2
18 624655 Spigot O-ring
19 624645 Spigot Extension O-ring
20 3152581 Spigot, White
21 624677 Spigot O-ring
22 1177905 Front Door
23 482035 Knob, Black
30
AUGER P ARTS
Drawing Part
Index No. Number Qty. Description
1 2104552 1 Auger Front Support
2 149003 1 Front Bearing
3 381804 6 Plastic Flight
4 694255 6 Spring
5 4151178 1 Auger
6 624678 1 Rear Seal O-ring
7 1151859 1 Rear Seal Adaptor
8 667868 1 Rear Seal
MISCELLANEOUS P ARTS
Description Part No.
Haynes Spray 12 oz.(340 grams) --------------------508017
Petro-Gel Tube 4 oz. (113 grams)--------------------508135
Spline Lubricant 2 oz. (57 grams)--------------------508048
Brush 4"x 8"x16" (10cm x 20cm x 40,5cm) -------208135
Brush 2.5"x 4"x12" (6,5cm x 10cm x 30,5cm)----208146
Brush .25"x 4"x14" (,6cm x 10cm x 35,5cm) -----208380
Brush 1"x3.5"x18" (2,5cm x 9cm x 45,5cm) ------ 208465
Drip Tray ---------------------------------------------------744273
Drip Tray Grid --------------------------------------------- 417006
31
264241
756067
1172864
756204
756088
375867
756088
376041
696130
694247
1151965
756088
762256
Figure 7. Mix Pump
32
DECALS
Qty. Part Number Description
2 324200 H.P . Manual Reset
2 324798 Clean-Off-Serve
2 324797 Standby/Serve
1 324800 Cab Off-On
2 324799 Pump Off On
1 324141 Caution, Haz. Rot. Blade - Front Panel
1 324509 Cleaning - Right Side
2 324014 Auger Rotation - Evap. Enclosure Rear
4 324686 Danger - Start Auto, on Evap. Support between belts & motors support brkt.
1 723525 Winterizing, Attach to water hose near bottom
2 324106 Caution - Elec. Wiring Mat'ls must conform between water couplings, one rear
panel bottom
2 324346 Caution - Haz. Mov. Part s, on inside of mtr support brkt @ rear
3 324107 Caution - Haz. Mov. Parts, on cond. bkt. rear & (2) on evap. enclosure sides
2 324208 Attn - Ref. Lk Chk, on evap. enclosure sides
2 723552 T ag - Supply volt., inside J-Box
1 723517 Card - Inside one J-Box
2 ID Tags, Back Panel Top
1 324548 Add. Vent Back Panel Ctr Top
1 Made in U.S.A. - Back panel
2 324103 Caution - Rot. Shaft, on gearbox support bracket
2 324151 Field Connections, J-Box cover, out side
3 324125 Danger Elec.Shock, J-Box covers outside, back panel bottom
1 324242 Warm/Cold, @ T-Stat
2 324565 Night/Serve - T emp. Control Bracket
2 324158 Use copper cond. only , inside both J-boxes
2 324566 Wired According to, on elec. schematic envelope
2 130000 Elec. Schematic Envelope
1 324065 Water Inlet - Back panel above inlet coupling
1 324803 Header panel decal (Stoelting Logo)
1 324804 Header panel decal (Stoelting Swirl)
1 324805 Header panel decal (DQ Logo)
33
34
WARRANTY
SOFT SERVE / SHAKE FREEZERS
1. Scope:
Stoelting, LLC warrants to the first user (the “Buyer”) that the freezer cylinders, hoppers, compressors, drive motors,
speed reducers, augers and auger flights of Stoelting soft serve / shake freezers will be free from defects in materials
and workmanship under normal use and proper maintenance appearing within five (5) years, and that all other
components of such equipment manufactured by Stoelting will be free from defects in material and workmanship
under normal use and proper maintenance appearing within twelve (12) months after the date that such equipment is
originally installed.
2. Disclaimer of Other Warranties:
THIS W ARRANTY IS EXCLUSIVE; AND STOEL TING HEREBY DISCLAIMS ANY IMPLIED W ARRANTY OF MERCHANT ABILITY OR FITNESS FOR P ARTICULAR PURPOSE.
3. Remedies:
Stoelting’s sole obligations, and Buyer ’s sole remedies, for any breach of this warranty shall be the repair or (at
Stoelting’s option) replacement of the affected component at Stoelting’s plant in Kiel, Wisconsin, or (again, at
Stoelting’ s option) refund of the purchase price of the affected equipment, and, during the first twelve (12) months of
the warranty period, deinstallation/reinstallation of the affected component from/into the equipment. Those obligations/remedies are subject to the conditions that Buyer (a) signs and returns to Stoelting, upon installation, the
Checklist/Warranty Registration Card for the affected equipment, (b) gives Stoelting prompt written notice of any
claimed breach of warranty within the applicable warranty period, and (c) delivers the affected equipment to Stoelting
or its designated service location, in its original packaging/crating, also within that period. Buyer shall bear the cost
and risk of shipping to and from Stoelting’s plant or designated service location.
4. Exclusions and Limitations:
This warranty does not extend to parts, sometimes called “wear parts”, which are generally expected to deteriorate
and to require replacement as equipment is used, including as examples but not intended to be limited to o-rings,
auger seals, auger support bushings and drive belts. All such parts are sold
AS IS.
Further, S toelting shall not be responsible to provide any remedy under this warranty with respect to any component
that fails by reason of negligence, abnormal use, misuse or abuse, use with parts or equipment not manufactured or
supplied by Stoelting, or damage in transit.
THE REMEDIES SET FORTH IN THIS W ARRANTY SHALL BE THE SOLE LIABILITY STOEL TING
AND THE EXCLUSIVE REMEDY OF BUYER WITH RESPECT TO EQUIPMENT SUPPLIED BY
STOEL TING; AND IN NO EVENT SHALL ST OEL TING BE LIABLE FOR ANY INCIDENT AL OR
CONSEQUENTIAL DAMAGES, WHETHER FOR BREACH OF W ARRANTY OR OTHER CONTRACT
BREACH, NEGLIGENCE OR OTHER TOR T, OR ON ANY STRICT LIABILITY THEORY .
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