Manitowoc U65 User manual

Part Number: 040006019 Rev. 01 09/18
UnderCounter Ice Machines
U65 Models
Installation, Operation and Maintenance Manual
,Caution
Read this instruction before operating this equipment.
Original Document

Safety Notices
Safety Notices
Read these precautions to prevent personal injury:
• Read this manual thoroughly before operating,
installing or performing maintenance on the
equipment. Failure to follow instructions in this manual
can cause property damage, injury or death.
• Routine adjustments and maintenance procedures
outlined in this manual are not covered by the
warranty.
• Proper installation, care and maintenance are
essential for maximum performance and trouble-
free operation of your equipment. Visit our website
www.manitowocice.com for manual updates,
translations, or contact information for service agents
in your area.
• This equipment contains high voltage electricity and
refrigerant charge. Installation and repairs are to be
performed by properly trained technicians aware of
the dangers of dealing with high voltage electricity and
refrigerant under pressure. The technician must also
be certified in proper refrigerant handling and servicing
procedures. All lockout and tag out procedures must be
followed when working on this equipment.
• This equipment is intended for indoor use only. Do not
install or operate this equipment in outdoor areas.
DEFINITIONS
DANGER
Indicates a hazardous situation that, if not avoided, will
result in death or serious injury. This applies to the most
extreme situations.
nWarning
Indicates a hazardous situation that, if not avoided, could
result in death or serious injury.
,Caution
Indicates a hazardous situation that, if not avoided, could
result in minor or moderate injury.
Notice
Indicates information considered important, but not
hazard-related (e.g. messages relating to property
damage).
NOTE: Indicates useful, extra information about the
procedure you are performing.
nWarning
Follow these precautions to prevent personal injury
during installation of this equipment:
• Installation must comply with all applicable equipment
fire and health codes with the authority having
jurisdiction.
• To avoid instability the installation area must be
capable of supporting the combined weight of the
equipment and product. Additionally the equipment
must be level side to side and front to back.
• Remove all removable panels before lifting and
installing and use appropriate safety equipment
during installation and servicing. Two or more people
are required to lift or move this appliance to prevent
tipping and/or injury.
• Connect to a potable water supply only.
• Do not damage the refrigeration circuit when installing,
maintaining or servicing the unit.
nWarning
Follow these electrical requirements during installation of
this equipment:
• All field wiring must conform to all applicable codes of
the authority having jurisdiction. It is the responsibility
of the end user to provide the disconnect means to
satisfy local codes. Refer to rating plate for proper
voltage.
• This appliance must be grounded.
• This equipment must be positioned so that the plug is
accessible unless other means for disconnection from
the power supply (e.g., circuit breaker or disconnect
switch) is provided.
• Check all wiring connections, including factory
terminals, before operation. Connections can become
loose during shipment and installation.

DANGER
Do not operate equipment that has been misused, abused,
neglected, damaged, or altered/modified from that of
original manufactured specifications. This appliance is
not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of
experience and knowledge, unless they have been given
supervision concerning use of the appliance by a person
responsible for their safety. Do not allow children to play
with, clean or maintain this appliance without proper
supervision.
nWarning
Follow these precautions to prevent personal injury while
operating or maintaining this equipment:
• Read this manual thoroughly before operating,
installing or performing maintenance on the
equipment. Failure to follow instructions in this manual
can cause property damage, injury or death.
• Crush/Pinch Hazard. Keep hands clear of moving
components. Components can move without warning
unless power is disconnected and all potential energy is
removed.
• Moisture collecting on the floor will create a slippery
surface. Clean up any water on the floor immediately to
prevent a slip hazard.
• Objects placed or dropped in the bin can affect human
health and safety. Locate and remove any objects
immediately.
• Never use sharp objects or tools to remove ice or frost.
Do not use mechanical devices or other means to
accelerate the defrosting process.
• When using cleaning fluids or chemicals, rubber gloves
and eye protection (and/or face shield) must be worn.
DANGER
Follow these precautions to prevent personal injury
during use and maintenance of this equipment:
• It is the responsibility of the equipment owner to
perform a Personal Protective Equipment Hazard
Assessment to ensure adequate protection during
maintenance procedures.
• Do Not Store Or Use Gasoline Or Other Flammable
Vapors Or Liquids In The Vicinity Of This Or Any Other
Appliance. Never use flammable oil soaked cloths or
combustible cleaning solutions for cleaning.
• All covers and access panels must be in place and
properly secured when operating this equipment.
• Risk of fire/shock. All minimum clearances must be
maintained. Do not obstruct vents or openings.
• Failure to disconnect power at the main power supply
disconnect could result in serious injury or death. The
power switch DOES NOT disconnect all incoming power.
• All utility connections and fixtures must be maintained
in accordance with the authority having jurisdiction.
• Turn off and lockout all utilities (electric, water)
according to approved practices during maintenance or
servicing.
• Never use a high-pressure water jet for cleaning on
the interior or exterior of this unit. Do not use power
cleaning equipment, steel wool, scrapers or wire
brushes on stainless steel or painted surfaces.
• Two or more people are required to move this
equipment to prevent tipping.
• These units must be tethered/secured to comply with
all applicable codes.
• The on-site supervisor is responsible for ensuring that
operators are made aware of the inherent dangers of
operating this equipment.
• Do not operate any appliance with a damaged cord
or plug. All repairs must be performed by a qualified
service company.

Table of Contents
Part Number: 040006019 Rev. 01 09/18 5
Safety Notices
Safety Notices ................................................................................................................... 3
Definitions....................................................................................................................... 3
Section 1
General Information
Model/Serial Number Location ......................................................................................... 7
Owner Warranty Registration Card .................................................................................... 8
General............................................................................................................................ 8
Commercial Warranty Coverage .....................................................................................8
Authorized Warranty Service ..........................................................................................8
Service Calls .................................................................................................................... 8
Residential Warranty Coverage....................................................................................... 9
Section 2
Installation
General ........................................................................................................................... 11
Dimensions ..................................................................................................................... 11
Location of Ice Machine................................................................................................... 12
Ice Machine Heat of Rejection......................................................................................... 12
Leveling the Ice Machine ................................................................................................. 12
Electrical Service ............................................................................................................. 13
Voltage .......................................................................................................................... 13
Fuse/Circuit Breaker......................................................................................................13
Electrical Rating............................................................................................................. 13
Electrical Cord Strain Relief ...........................................................................................14
Terminal Block Wire Connection................................................................................... 14
Water Service/Drains ...................................................................................................... 15
Water Supply................................................................................................................. 15
Drain Connections......................................................................................................... 15
Water Supply And Drain Line Sizing/Connections.........................................................15

6 Part Number: 040006019 Rev. 01 09/18
Table of Contents (continued)
Section 3
Operation
Sequence of Operation.................................................................................................... 17
Initial Start-Up or Start-Up after Automatic Shut-Off....................................................17
Ice Thickness Adjustment ................................................................................................ 18
Section 4
Maintenance
Interior Cleaning and Sanitizing ....................................................................................... 19
General.......................................................................................................................... 19
Cleaning And Sanitizing Procedure ...............................................................................19
Exterior Cleaning ............................................................................................................. 21
Ice Machine Inspection.................................................................................................... 21
Cleaning the Condenser................................................................................................... 22
Removal from Service/Winterization............................................................................... 22
Section 5
Troubleshooting
Checklist.......................................................................................................................... 23

Part Number: 040006019 Rev. 01 09/18 7
Model/Serial Number Location
Record the model and serial number of your ice machine in
the space provided below. These numbers are required when
requesting information from your Manitowoc distributor,
service representative or the factory.
The model and serial number are listed on the OWNER
WARRANTY REGISTRATION CARD. They are also listed on the
MODEL/SERIAL NUMBER DECAL affixed to the ice machine.
MODEL AND
SERIAL NUMBER
MODEL AND
SERIAL NUMBER
Model/Serial Number Location
Model Number:__________________________ Serial Number:___________________________
Section 1
General Information

8 Part Number: 040006019 Rev. 01 09/18
General Information Section 1
Owner Warranty Registration Card
GENERAL
The packet containing this manual also includes warranty
information. Warranty coverage begins the day your new ice
machine is installed.
Important
Complete and mail the OWNER WARRANTY REGISTRATION
CARD as soon as possible to validate the installation date.
If you do not return your OWNER WARRANTY REGISTRATION
CARD, Manitowoc will use the date of sale to the Manitowoc
Distributor as the first day of warranty coverage for your new
ice machine.
COMMERCIAL WARRANTY COVERAGE
General
The following Warranty outline is provided for your
convenience. For a detailed explanation, read the warranty
bond shipped with each product.
Contact your local Manitowoc representative or Manitowoc
Ice, Inc. if you need further warranty information.
Parts
Manitowoc warrants the ice machine against defects in
materials and workmanship, under normal use and service
for three (3) years from the date of original installation.
Labor
Labor required to repair or replace defective components
is covered for three (3) years from the date of original
installation.
Exclusions
The following items are not included in the ice machine’s
warranty coverage:
1. Normal maintenance, adjustments and cleaning as
outlined in this manual.
2. Repairs due to unauthorized modifications to the ice
machine or use of non-standard parts without prior
written approval from Manitowoc Ice, Inc.
3. Damage caused by improper installation of the ice
machine, electrical supply, water supply or drainage, or
damage caused by floods, storms, or other acts of God.
4. Premium labor rates due to holidays, overtime, etc.;
travel time; flat rate service call charges; mileage and
miscellaneous tools and material charges not listed on
the payment schedule. Additional labor charges resulting
from the inaccessibility of equipment are also excluded.
5. Parts or assemblies subjected to misuse, abuse, neglect
or accidents.
6. Damage or problems caused by installation, cleaning
and/or maintenance procedures inconsistent with the
technical instructions provided in this manual.
AUTHORIZED WARRANTY SERVICE
To comply with the provisions of the warranty, a
refrigeration service company, qualified and authorized
by your Manitowoc distributor, or a Contracted Service
Representative must perform the warranty repair.
NOTE: If the dealer you purchased the ice machine from is
not authorized to perform warranty service, contact your
Manitowoc distributor or Manitowoc Ice, Inc. for the name
of the nearest authorized service representative.
SERVICE CALLS
Normal maintenance, adjustments and cleaning as outlined
in this manual are not covered by the warranty. If you have
followed the procedures listed in this manual, and the ice
machine still does not perform properly, call your authorized
service company.

Part Number: 040006019 Rev. 01 09/18 9
Section 1 General Information
RESIDENTIAL WARRANTY COVERAGE
WHAT DOES THIS LIMITED WARRANTY COVER?
Subject to the exclusions and limitations below, Manitowoc
Ice, Inc. (“Manitowoc”) warrants to the original consumer
that any new ice machine manufactured by Manitowoc
(the “Product”) shall be free of defects in material or
workmanship for the warranty period outlined below under
normal use and maintenance, and upon proper installation
and start-up in accordance with the instruction manual
supplied with the Product.
HOW LONG DOES THIS LIMITED WARRANTY LAST?
Ice Machine - Twelve (12) months from the sale date.
WHO IS COVERED BY THIS LIMITED WARRANTY?
This limited warranty only applies to the original consumer of
the Product and is not transferable.
WHAT ARE MANITOWOC ICE’S OBLIGATIONS UNDER THIS
LIMITED WARRANTY?
If a defect arises and Manitowoc receives a valid warranty
claim prior to the expiration of the warranty period,
Manitowoc shall, at its option: (1) repair the Product at
Manitowoc’s cost, including standard straight time labor
charges, (2) replace the Product with one that is new or at
least as functionally equivalent as the original, or (3) refund
the purchase price for the Product.
Replacement parts are warranted for 90 days or the balance
of the original warranty period, whichever is longer. The
foregoing constitutes Manitowoc’s sole obligation and the
consumer’s exclusive remedy for any breach of this limited
warranty. Manitowoc’s liability under this limited warranty is
limited to the purchase price of Product. Additional expenses
including, without limitation, service travel time, overtime or
premium labor charges, accessing or removing the Product,
or shipping are the responsibility of the consumer.
HOW TO OBTAIN WARRANTY SERVICE
To obtain warranty service or information regarding your
Product, please contact us at:
MANITOWOC ICE
2110 So. 26th St.,
P.O. Box 1720,
Manitowoc, WI 54221-1720
Telephone: [phone] Fax: [phone]
www.welbilt.com
WHAT IS NOT COVERED?
This limited warranty does not cover, and you are solely
responsible for the costs of: (1) periodic or routine
maintenance, (2) repair or replacement of the Product or
parts due to normal wear and tear, (3) defects or damage to
the Product or parts resulting from misuse, abuse, neglect
or accidents, (4) defects or damage to the Product or
parts resulting from improper or unauthorized alterations,
modifications or changes; and (5) defects or damage to
any Product that has not been installed and/or maintained
in accordance with the instruction manual or technical
instructions provided by Manitowoc. To the extent that
warranty exclusions are not permitted under some state
laws, these exclusions may not apply to you.
EXCEPT AS STATED IN THE FOLLOWING SENTENCE, THIS
LIMITED WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY
OF MANITOWOC WITH REGARD TO THE PRODUCT. ALL
IMPLIED WARRANTIES ARE STRICTLY LIMITED TO THE
DURATION OF THE LIMITED WARRANTY APPLICABLE TO THE
PRODUCTS AS STATED ABOVE, INCLUDING BUT NOT LIMITED
TO, ANY WARRANTY OF MERCHANTABILITY OR OF FITNESS
FOR A PARTICULAR PURPOSE. Some states do not allow
limitations on how long an implied warranty lasts, so the
above limitation may not apply to you.
IN NO EVENT SHALL MANITOWOC OR ANY OF ITS AFFILIATES
BE LIABLE TO THE CONSUMER OR ANY OTHER PERSON FOR
ANY INCIDENTAL, CONSEQUENTIAL OR SPECIAL DAMAGES
OF ANY KIND (INCLUDING, WITHOUT LIMITATION, LOSS
OF PROFITS, REVENUE OR BUSINESS) ARISING FROM OR
IN ANY MANNER CONNECTED WITH THE PRODUCT, ANY
BREACH OF THIS LIMITED WARRANTY OR ANY OTHER CAUSE
WHATSOEVER, WHETHER BASED ON CONTRACT, TORT OR
ANY OTHER THEORY OF LIABILITY. Some states do not allow
the exclusion or limitation of incidental or consequential
damages, so the above limitation or exclusion may not apply
to you.
HOW STATE LAW APPLIES
This limited warranty gives you specific legal rights, and you
may also have rights that vary from state to state or from one
jurisdiction to another.
REGISTRATION CARD
To secure prompt and continuing warranty service, this
warranty registration card must be completed and sent
to Manitowoc within thirty (30) days from the sale date.
Complete the following registration card and send it to
Manitowoc at the address shown.

10 Part Number: 040006019 Rev. 01 09/18
General Information Section 1
THIS PAGE INTENTIONALLY LEFT BLANK

Part Number: 040006019 Rev. 01 09/18 11
General
These instructions are provided to assist the qualified
installer.
Dimensions
19.7"
(500 mm)
31.1"
(790 mm)
22.4"
(570 mm)
Section 2
Installation

12 Part Number: 040006019 Rev. 01 09/18
Installation Section 2
Location of Ice Machine
The location selected for the ice machine must meet the
following criteria. If any of these criteria are not met, select
another location.
• The location must be indoors.
• The location must be free of airborne and other
contaminants.
• The air temperature must be at least 50°F (10°C), but
must not exceed 104°F (40°C).
• The location must not be near heat-generating
equipment or in direct sunlight.
• The location must be capable of supporting the weight of
the ice machine and a full bin of ice.
• The location must allow enough clearance for water,
drain and electrical connections in the rear of the ice
machine.
• The location must not obstruct airflow through or
around the ice machine (condenser airflow is in and
out the front). Refer to the chart below for clearance
requirements.
Self-Contained Air-Cooled
Top/Sides 5" (127 mm)
Back 5" (127 mm)
NOTE: The ice machine may be built into a cabinet.
There is no minimum clearance requirement for the top or
left and right sides of the ice machine. The listed values are
recommended for efficient operation and servicing only.
Notice
The ice machine must be protected if it will be subjected
to temperatures below 32°F (0°C). Failure caused by
exposure to freezing temperatures is not covered by the
warranty. See “Removal from Service/Winterization”
Section 4.
Ice Machine Heat of Rejection
Series
Ice Machine
Heat of Rejection*
Air Conditioning** Peak
UDE0065A 1600 2350
**B.T.U./Hour.
** Because the heat of rejection varies during the ice making cycle, the
figure shown is an average.
Ice machines, like other refrigeration equipment, reject heat
through the condenser. It is helpful to know the amount of
heat rejected by the ice machine when sizing air conditioning
equipment where self-contained aircooled ice machines are
installed.
Leveling the Ice Machine
After moving the ice machine into the installation location, it
must be leveled for proper operation. Follow these steps to
level the ice machine:
1. Check the level of the ice machine from front to back
and from side to side.
Checking for Level
2. If the ice machine is not level, adjust the leveling
glides on each corner of the base of the ice machine as
necessary.
Leveling Glide
3. Check the level of the ice machine after each adjustment
of the leveling glides.
4. Repeat steps 2 and 3 until the ice machine is level from
front to back and from side to side.

Part Number: 040006019 Rev. 01 09/18 13
Section 2 Installation
Electrical Service
nWarning
All wiring must conform to local, state and national codes.
Voltage/Phase Electrical Rating
230/50/1 0.6 kW
230/60/1 0.6 kW
115/60/1 0.6 kW
VOLTAGE
The maximum allowable voltage variation is ±10% of the
rated voltage on the ice machine model/serial number plate
at start-up (when the electrical load is highest).
nWarning
The ice machine must be grounded in accordance with
national and local electrical codes.
nWarning
Never use an extension cord. If an outlet is not within
reach of the ice machine’s power cord, have a proper
amperage outlet wired closer to the ice machine.
FUSE/CIRCUIT BREAKER
A separate fuse/circuit breaker must be provided for each ice
machine.
NOTE: A disconnect means must be provided for field wiring.
ELECTRICAL RATING
The electrical rating is used to help select the wire size of
the electrical supply. The wire size (or gauge) also depends
on location, materials used, length of run, etc., so it must be
determined by a qualified electrician.

14 Part Number: 040006019 Rev. 01 09/18
Installation Section 2
ELECTRICAL CORD STRAIN RELIEF
To prevent strain at the electrical connection inside the
ice machine, an electrical cord strain relief device must be
installed on the rear panel of the ice machine.
1. Disassemble the strain relief device into its three
components.
2. Install the cord holder through the opening in the lower
right corner of the rear panel of the ice machine.
COMPRESSION
NUT
ELECTRICAL
CORD
CORD
HOLDER
RETAINING NUT
(BEHIND THE
PANEL)
Strain Relief Installation
3. Hand-tighten the retaining nut onto the cord holder
from inside the ice machine rear panel.
4. Slide the compression nut over the electrical cord.
5. Feed about 5 ft. (1.5 m) of electrical cord through the
cord holder. (The extra cord will allow the rear panel to
be removed for future service.)
6. Hand-tighten the compression nut onto the cord holder.
TERMINAL BLOCK WIRE CONNECTION
nWarning
Always disconnect power to the ice machine before
working on electrical circuitry.
After the electrical cord is installed in the strain relief device,
the cord must be connected to the terminal block to supply
power to the ice machine.
1. Remove two Phillips head screws to remove the lower
panel from the front of the ice machine.
2. Carefully reach into the ice machine and pull the
electrical cord forward to the terminal block.
3. Strip away enough insulation from the electrical cord
to allow for good electrical connections at the terminal
block.
TERMINAL
BLOCK
ELECTRICAL
CORD
L1
N
GND
Terminal Block Connections
4. Open the screw terminals on the terminal block.
5. Connect each wire in the electrical cord to the
appropriate screw terminal.
6. Carefully tighten the screws over the wire.
7. Tug lightly on each wire to be sure the connections are
secure.

Part Number: 040006019 Rev. 01 09/18 15
Section 2 Installation
Water Service/Drains
WATER SUPPLY
Local water conditions may require treatment of the water to
inhibit scale formation, filter sediment, remove chlorine, and
improve taste and clarity.
Important
If you are installing a Manitowoc Tri-Liminator water filter
system, refer to the Installation Instructions supplied with
the filter system for ice making water inlet connections.
Follow these guidelines to install water inlet lines:
• Connect to potable water supply only.
• Do not connect the ice machine to a hot water supply.
Be sure all hot water restrictors installed for other
equipment are working. (Check valves on sink faucets,
dishwashers, etc.)
• If water pressure exceeds the maximum recommended
pressure, obtain a water pressure regulator from your
Manitowoc distributor.
• Install a water shut-off valve for both the ice making and
condenser water lines (if applicable).
• Insulate water lines to prevent condensation.
Important
The water inlet line is connected to the water valve. This
valve is located just behind the front panel of the ice
machine.
DRAIN CONNECTIONS
Follow these guidelines when installing drain lines to prevent
drain water from flowing back into the ice machine and
storage bin:
• Drain lines must have a 1" drop per 40" (2.5 cm per
meter) of run, and must not create traps.
• The floor drain must be large enough to accommodate
drainage from all drains.
• Insulate the bin drain line to prevent condensation.
WATER SUPPLY AND DRAIN LINE SIZING/CONNECTIONS
,Caution
Plumbing must conform to state and local codes.
Water
Temperature
Water
Pressure
Ice Machine
Fitting
Tubing Size Up to Ice
Machine Fitting
Ice Making
Water Inlet
50°F (10°C)Min.1
86°F (30°C)Max.2
34.8 psi (240 kPa)Min.1
89.9 psi (620 kPa)Max.2
3/4" male hose
connection3
3/8" (9.5 mm) minimum
inside diameter
Ice Making/Bin Water
Drain — — 5/8" (16 mm) inside diameter flexible hose
5/8" (16 mm) minimum
inside diameter
1Min. = Minimum.
2Max. = Maximum.
3A 3/4" by 11-1/2 threads per inch to 14 threads per inch adapter is factory installed. Remove this adapter if 11-1/2 threads per inch connection is desired.
Installation Note (Switzerland) The connection to the drinking water network must be made with a certified backflow preventer
type EA (EN13959) and with a certified connection hose (EN13618 or EN61770) on site.

16 Part Number: 040006019 Rev. 01 09/18
Installation Section 2
ICE MAKING/BIN WATER DRAIN TUBING
5/8" (16 mm) MINIMUM INSIDE DIAMETER
OVERFLOW
TUBE
DRAIN
HOLE
ICE MAKING WATER INLET TUBING
3/8" (9.5 mm) MINIMUM INSIDE DIAMETER
Typical Water Supply and Drain Line Sizing and Connections

Part Number: 040006019 Rev. 01 09/18 17
Sequence of Operation
Ice Making Sequence
of Operation
Control Board Relays
1
Compressor
2
Hot Gas Valve
Water Fill Valve
3
Water Pump
Fan Motor
Length of
“ON” Time
Start-up*
1. Water Purge
2. Refrigeration System
Start-up
off on on 2.9 Minutes
(175 Seconds)
on on off 5 Seconds
3. Freeze Cycle on off on Automatically
determined
4. Harvest Cycle on on off Automatically
determined
5. Auto Shut-off off off off Until bin thermostat
re-closes
*Initial Start-up or Start-up After Automatic Shut-off.
INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF
1. Water Purge
The water fill valve and the hot gas valve are energized
for 2.9 minutes (175 seconds). This ensures that the ice
making cycle starts with fresh water, and that the refrigerant
pressures are equalized prior to refrigeration system start-up.
2. Refrigeration System Start-up
The compressor starts 2.9 minutes (175 seconds) after
the water fill valve and hot gas valve are energized. (The
water fill valve and hot gas valve remain energized for 5
seconds during compressor start-up, and then shut off.) The
compressor remains on throughout the entire freeze and
harvest cycles.
3. Freeze Cycle
The condenser fan motor and water pump are energized and
remain on throughout the entire freeze cycle. An even flow
of water is directed across the evaporator and into each cube
cell, where it freezes.
The control system automatically determines the length
of the freeze cycle by monitoring the temperature of the
refrigeration system liquid line.
4. Harvest Cycle
The condenser fan motor and water pump de-energize. The
water fill valve energizes to purge the water in the water
trough. The hot gas valve also energizes at the beginning
of the harvest cycle to divert hot refrigerant gas into the
evaporator. The hot refrigerant gas warms the evaporator,
causing the cubes to slide, as a sheet, off the evaporator and
into the ice storage bin.
The control system automatically determines the length
of the harvest cycle, based on the temperature of the
refrigeration system liquid line at the end of the freeze cycle.
At the end of the harvest cycle, the ice machine returns to
another freeze cycle.
5. Automatic Shut-off
The ice machine shut-off is controlled by the level of ice in
the ice storage bin. When the bin is full, ice cubes contact
the bin thermostat bulb holder, which cools down and opens
to stop the ice machine. The ice machine remains off until
enough ice has been removed from the bin. This causes the
thermostat bulb holder to warm and close, restarting the ice
machine. When the ice machine restarts, it returns to the
start-up sequence.
Section 3
Operation

18 Part Number: 040006019 Rev. 01 09/18
Operation Section 3
Ice Thickness Adjustment
QM-20 dice ice cube formation is slightly different from our
previous models. Manitowoc ice machines have a unique
cube shape. It is normal to have a dimple in the ice cube (a
concave indentation in the cube). Ice cubes from the QM-20
may appear to have a slightly larger dimple than other
Manitowoc dice cube machines. Therefore, cube size for
the QM-20 is determined by measuring the slab weight (the
combined weight of all cubes from one harvest cycle). To
determine proper slab weight follow the instructions listed
below.
ICE BRIDGE SHOULD BE 1/16" TO 1/8"
(1.5 mm TO 3.2 mm) THICKNESS
A DIMPLE
IN EACH
CUBE CELL IS
NORMAL
Correct Ice Bridge Thickness
1. Ensure the air filter, front, and back panels are installed
properly and close the bin door.
2. During the third harvest cycle open the bin door and
catch the entire slab of ice.
3. Weigh the ice slab. The combined weight of all cubes
from one harvest should weigh between 7 and 9 oz (200
and 270g). If the slab weight is within this range, the ice
machine is working properly and no further action is
needed. If the slab weight is not within this range or you
desire a slightly thicker or thinner cube, continue to step
four.
nWarning
Do not touch electrical wires. Disconnect power to the ice
machine before making any ice thickness adjustments.
4. Remove the air filter.
5. Remove the two screws holding the front panel in place
and remove the front cover.
6. Locate the ice thickness control dial on the control board
(see below). Turn the dial clockwise for a thicker cube or
counter clockwise for a thinner cube.
ICE THICKNESS
ADJUSTMENT
DIAL
DIAL IS
FACTORY SET
TO ZERO
Ice Thickness Adjustment Dial
7. Ensure all of the panels and air filter are reinstalled
properly and the bin door is closed. Repeat steps 1
through 3.
After completing the procedure above, if you are unable to
obtain a sheet of ice weighing 7 to 9 oz (200 to 270g) contact
the Welbilt Service Department for further assistance.

Part Number: 040006019 Rev. 01 09/18 19
Interior Cleaning and Sanitizing
GENERAL
Clean and sanitize the ice machine every six months for
efficient operation. If the ice machine requires more frequent
cleaning and sanitizing, consult a qualified service company
to test the water quality and recommend appropriate water
treatment.
The ice machine must be taken apart for cleaning and
sanitizing.
,Caution
Use only Manitowoc approved Ice Machine Cleaner
(part number 94-0546-3) and Sanitizer (part number
94-0565-3). It is a violation of Federal law to use these
solutions in a manner inconsistent with their labeling.
Read and understand all labels printed on bottles before
use.
CLEANING AND SANITIZING PROCEDURE
,Caution
Do not mix Ice Machine Cleaner and Sanitizer solutions
together. It is a violation of Federal law to use these
solutions in a manner inconsistent with their labeling.
nWarning
Wear rubber gloves and safety goggles (and/or face
shield) when handling Ice Machine Cleaner or Sanitizer.
Ice machine cleaner is used to remove lime scale and mineral
deposits. Ice machine sanitizer disinfects and removes algae
and slime.
Step 1 Set the toggle switch to the OFF position after ice
falls from the evaporator at the end of a Harvest cycle. Or, set
the switch to the OFF position and allow the ice to melt off
the evaporator.
Notice
Never use anything to force ice from the evaporator.
Damage may result.
Step 2 Remove all ice from the bin.
Step 3 To start a cleaning cycle, move the toggle switch to
the WASH position.
Step 4 Wait until water flows over the evaporator (about
three minutes) then add the proper amount of Manitowoc
Ice Machine Cleaner to the water trough.
Model Amount of Cleaner
U65 1.5 oz (45 ml)
Step 5 Wait until the clean cycle is complete
(approximately 45 minutes) then place the toggle switch in
the OFF position, disconnect power and water supplies to the
ice machine.
nWarning
Disconnect electric power to the ice machine at the
electric switch box before proceeding.
Step 6 Remove parts for cleaning.
A. Remove the Overflow Tube
• To remove the tube, lift it up while using a slight back and
forth motion to loosen it from the drain hole.
When installing the tube, be sure it is completely inserted
into the drain hole to prevent water leakage during normal
operation.
OVERFLOW
TUBE
DRAIN
HOLE
Removing the Overflow Tube
Section 4
Maintenance

20 Part Number: 040006019 Rev. 01 09/18
Maintenance Section 4
B. Remove the Vinyl Hose
• Disconnect the water pump discharge hose from the
distribution tube and water pump.
C. Remove the Water Pump
• Disconnect the water pump power cord.
• Loosen the screws that hold the water pump in place.
• Lift the water pump and bracket assembly up and off the
screws.
SCREWS
WATER
PUMP
Removing the Water Pump
D. Remove the Water Trough
• Remove the screws holding the water trough to the walls
of the cabinet.
Step 7 Mix a solution of cleaner and warm water.
Depending on the amount of mineral buildup, a larger
quantity of solution may be required. Use the ratio in the
table below to mix enough solution to thoroughly clean all
parts.
Solution Type Water Mixed with
Cleaner 1 gal (4 L) 16 oz (500 ml)
cleaner
Step 8 Use 1/2 of the cleaner/water solution to clean all
components. The cleaner solution will foam when it contacts
lime scale and mineral deposits; once the foaming stops use
a soft bristle brush, sponge or cloth (not a wire brush) to
carefully clean the parts. Soak the parts for 5 minutes (15 –
20 minutes for heavily scaled parts). Rinse all components
with clean water.
Step 9 While components are soaking, use 1/2 of the
cleaner/water solution to clean all foodzone surfaces of
the ice machine and bin. Use a nylon brush or cloth to
thoroughly clean the following ice machine areas:
• Evaporator plastic parts – including top, bottom and sides
• Bin bottom, sides and top
Rinse all areas thoroughly with clean water.
Step 10 Mix a solution of sanitizer and warm water.
Solution Type Water Mixed With
Sanitizer 6 gal (23 L) 4 oz (120 ml)
sanitizer
Step 11 Use 1/2 of the sanitizer/water solution to sanitize
all removed components. Use a cloth or sponge to liberally
apply the solution to all surfaces of the removed parts or
soak the removed parts in the sanitizer/water solution. Do
not rinse parts after sanitizing.
Step 12 Use 1/2 of the sanitizer/water solution to sanitize
all foodzone surfaces of the ice machine and bin. Use a cloth
or sponge to liberally apply the solution. When sanitizing,
pay particular attention to the following areas:
• Evaporator plastic parts – including top, bottom and sides
• Bin bottom, sides and top
Do not rinse the sanitized areas.
Step 13 Replace all removed components.
Step 14 Reapply power and water to the ice machine and
place the toggle switch in the WASH position.
Step 15 Add the proper amount of Manitowoc Ice Machine
Sanitizer to the water trough.
Model Amount of Sanitizer
U65 1.5 oz (45 ml)
Step 16 Wait until the sanitize cycle is complete
(approximately 45 minutes) then place the toggle switch in
the OFF position, disconnect power and water supplies to the
ice machine.
nWarning
Disconnect electric power to the ice machine at the
electric switch box before proceeding.
Step 17 Repeat step 6 to remove parts for hand sanitizing.