Manitowoc STH042 4/16 Technician's Manual
Undercounter Ice Machines
Technician’s Handbook
This manual is updated as new information and models
are released. Visit our website for the latest manual.
www.manitowocice.com
Part Number STH042 4/16
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.
• As you work on this equipment, be sure to pay close
attention to the safety notices in this handbook.
Disregarding the notices may lead to serious injury
and/or damage to the equipment.
Warning
n
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.
• For a cord-connected appliance, the following must
be included:
• Do not unplug by pulling on cord. To unplug,
grasp the plug, not the cord.
• Unplug from outlet when not in use and before
servicing or cleaning.
• Do not operate any appliance with a
damaged cord or plug, or after the appliance
malfunctions or is dropped or damaged in any
manner. Contact the nearest authorized service
facility for examination, repair, or electrical or
mechanical adjustment
Warning
n
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.
• Ice machines require a deflector when installed on
an ice storage bin. Prior to using a non-OEM ice
storage system with this ice machine, contact the
bin manufacturer to assure their ice deflector is
compatible.
• 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.
• Do not damage the refrigeration circuit when
installing, maintaining or servicing the unit.
• Connect to a potable water supply only.
• This equipment contains refrigerant charge.
• Installation of the line sets must be performed by
a properly trained and EPA certified refrigeration
technician aware of the dangers of dealing with
refrigerant charged equipment.
Warning
n
Follow these precautions to prevent personal
injury while operating or maintaining this
equipment.
• Legs or casters must be installed and the legs/
casters must be screwed in completely. When
casters are installed the mass of this unit will allow
it to move uncontrolled on an inclined surface.
These units must be tethered/secured to comply
with all applicable codes. Swivel casters must be
mounted on the front and rigid casters must be
mounted on the rear. Lock the front casters after
installation is complete.
• Some 50 Hz models may contain up to 150 grams
of R290 (propane) refrigerant. R290 (propane)
is flammable in concentrations of air between
approximately 2.1% and 9.5% by volume (LEL lower
explosion limit and UEL upper explosion limit). An
ignition source at a temperature higher than 470°C
is needed for a combustion to occur.
• Refer to nameplate to identify the type of
refrigerant in your equipment.
• Only trained and qualified personnel aware of the
dangers are allowed to work on the 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.
Warning
n
Follow these precautions to prevent personal
injury while operating or maintaining this
equipment.
• 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
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.
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 (gas, electric,
water) according to approved practices during
maintenance or servicing.
• Units with two power cords must be plugged
into individual branch circuits. During movement,
cleaning or repair it is necessary to unplug both
power cords.
We reserve the right to make product improvements at
any time. Specifications and design are subject to change
without notice.
Table of Contents
General Information
Model Numbers............................... 15
How to Read a Model Number ................ 16
Ice Machine Warranty Information............ 17
Installation
Location of Ice Machine....................... 18
Ice Machine Clearance Requirements......... 19
Ice Machine Heat of Rejection ................ 19
Leveling the Ice Machine......................20
Electrical Requirements....................... 21
Electrical Specifications....................... 22
Water Service/Drains .........................24
Water Supply.............................. 24
Water Inlet Lines ..........................24
Drain Connections ........................ 25
Cooling Tower Applications ................ 25
Water Supply and Drain Line Sizing/
Connections .............................. 26
Part Number STH042 4/16 9
Maintenance
Interior Cleaning and Sanitizing ..............27
General ................................... 27
Cleaning and Sanitizing Procedure......... 27
Touch Pad Operation ...................... 28
Remove Parts for Cleaning................. 32
Preventative Maintenance Cleaning .......... 37
Ice Machine Inspection ....................... 38
Cleaning the Condenser ......................39
Removal from Service/Winterization .........40
Bin Removal ..................................41
Operation
Touch Pad Features ...........................43
On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Delay ..................................... 44
Clean ..................................... 44
Bin Full.................................... 45
Service.................................... 45
Ice Making Sequence of Operation ...........46
Control Board Timers ...................... 49
Safety Limits .............................. 50
Energized Parts Chart...................... 52
Operational Checks ...........................54
Ice Thickness Check ....................... 54
Ice Thickness Adjustment ..................54
Minimum/Maximum Slab weight .......... 55
10 Part Number STH042 4/16
Troubleshooting
Problem Checklist ............................ 57
Control Board Test Mode...................... 59
Operating Ice Machine with Bin and Touch Pad
Removed .................................59
Diagnosing an Ice Machine that Will Not Run . 60
Ice Machine Does Not Cycle Into Harvest when
Water Loses Contact with the Harvest Float
Switch......................................... 61
Ice Machine Cycles Into Harvest Before Water
Loses Contact with the Harvest Float Switch.. 63
Ice Production Check .........................65
Installation/Visual Inspection Checklist ...... 67
Water System Checklist ....................... 68
Ice Formation Pattern .........................69
Safety Limit Feature ..........................71
Analyzing Discharge Pressure ................ 78
Analyzing Suction Pressure ..................80
Harvest Valve .................................84
Comparing Evaporator Inlet/Outlet
Temperatures ................................. 88
Discharge Line Temperature Analysis......... 89
Refrigeration Component Diagnostics........ 91
Refrigeration Component Diagnostic Chart ..94
Part Number STH042 4/16 11
Component Check Procedures
Main Fuse .....................................99
Bin Switch....................................100
Touch Pad ....................................102
Float Switch..................................104
Water Trough Thermistor ....................106
Compressor Electrical Diagnostics...........108
Fan Cycle Control ............................110
High Pressure Cutout (HPCO) Control........111
Filter-Driers ..................................112
Refrigerant Recovery/Evacuation............113
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Refrigerant Re-use Policy .................114
Recovery and Recharging Procedures ....116
System Contamination Cleanup .............119
Determining Severity of Contamination...119
Mild System Contamination Cleanup
Procedure................................121
Severe System Contamination Cleanup
Procedure................................122
Replacing Pressure Controls without
Removing Refrigerant Charge.............123
Total System Refrigerant Charge.............125
12 Part Number STH042 4/16
Charts
Cycle Times, 24 Hr. Ice Production and
Refrigerant Pressure Charts..................127
U0140 Self-contained Air-cooled..........128
U0140 Self-contained Water-cooled.......129
U0190 Self-contained Air-cooled..........130
U0240 Self-contained Air-cooled..........131
U0240 Self-contained Water-cooled.......132
U0310 Self-contained Air-cooled..........133
U0310 Self-contained Water-cooled.......133
Diagrams
Wiring Diagrams .............................135
U140/U190/U240 wiring diagram
Without J4 thermistor terminal ...........136
U310 wiring diagram
Without J4 thermistor terminal ...........137
U140/U190/U240 wiring diagram
With J4 thermistor terminal...............138
U310 wiring diagram
With J4 thermistor terminal...............139
Electronic Control Board with J4 thermistor
terminal..................................140
Electronic Control Board with J1 and without
J4 Thermistor terminal ...................141
Electronic Control Board Prior to J1 the
terminal..................................142
Tubing Schematic - U0140 ...................143
Tubing Schematic - U0190/U0240/U0310....143
Part Number STH042 4/16 13
THIS PAGE INTENTIONALLY LEFT BLANK
14 Part Number STH042 4/16
General Information
Model Numbers
This manual covers the following models:
Self-contained
Air-cooled
UD0140A UD0140W
UD0140AE UD0140WE
UY0140A UY0140W
UY0140AE UY0140WE
UR0140A –
UR0140AE –
UD0190A –
UD0190AE –
UY0190A –
UY0190AE –
UR0190A –
UR0190AE –
UD0240A UD0240W
UD0240AE UD0240WE
UY0240A UY0240W
UY0240AE UY0240WE
UR0240A –
UR0240AE –
UD0310A UD0310W
UD0310AE UD0310WE
UY0310A UY0310W
UY0310AE UY0310WE
UR0310A –
UR0310AE –
Self-contained
Water-cooled
Part Number STH042 4/16 15
How to Read a Model Number
Cube Size
Series
Capacity
Condenser
Typ e
U D 0140 A E
E - WRAS 50Hz
R - Regular
D - Dice
Y - Half-dice
An ice machine contains high voltage electricity and
refrigerant charge. Repairs are to be performed by
properly trained refrigeration technicians aware of
the dangers of dealing with high voltage electricity
and refrigerant under pressure.
A - Air-cooled
W - Water-cooled
Warning
n
16 Part Number STH042 4/16
Ice Machine Warranty Information
For warranty information visit:
http://www.kool-aire.com/Service/Warranty
• Warranty Verification
• Warranty Registration
• View and download a copy of the warranty Owner
Warranty Registration Card
Warranty coverage begins the day the ice machine is
installed.
Part Number STH042 4/16 17
Installation
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.
• Air temperature: Must be at least 40°F (4°C) but must
not exceed 110°F (43.4°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.
• 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.
Ice Machine Clearance Requirements
Self-contained
Air-cooled
Top/Sides 5" (127 mm)* 5" (127 mm)*
Back 5" (127 mm)* 5" (127 mm)*
*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.
Self-contained
Water-cooled
Ice Machine Heat of Rejection
Series
Ice Machine
U140 2400 2900
U190 2200 2600
U240 2400 3400
U310 3800 6000
* 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.
Heat of Rejection*
Air Conditioning** Peak
Part Number STH042 4/16 19
Leveling the Ice Machine
1. Screw the leveling legs onto the bottom of the ice
machine.
2. Screw the foot of each leg in as far as possible.
Caution
,
The legs must be screwed in tightly to prevent them
from bending.
3. Move the ice machine into its final position.
4. Level the ice machine to ensure that the siphon
system functions correctly. Use a level on top of the
ice machine. Turn each foot as necessary to level the
ice machine from front to back and side to side.
THREAD
LEVELING LEG
INTO BASE OF
CABINET
THREAD “FOOT”
IN AS FAR AS
POSSIBLE
SV1606
Leg Installation
20 Part Number STH042 4/16
Electrical Requirements
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).
Fuse/Circuit Breaker
A separate fuse/circuit breaker must be provided for each
ice machine.
Total Circuit Ampacity
The total circuit ampacity is used to help select the wire
size of the electrical supply.
The wire size (or gauge) is also dependent upon
location, materials used, length of run, etc., so it must be
determined by a qualified electrician.
Part Number STH042 4/16 21
Electrical Specifications
Air-cooled Ice Machine
Ice Machine
U140
U190
U240
U310
Voltage
Phase Cycle
115/1/60 15 5.0
208-230/1/60 15 2.5
230/1/50 15 2.5
115/1/60 15 6.0
208-230/1/60 15 2.5
230/1/50 15 2.5
115/1/60 15 7.0
208-230/1/60 15 4.0
230/1/50 15 4.0
115/1/60 15 10.0
208-230/1/60 15 4.5
230/1/50 15 4.5
Max. Fuse/
Circuit
Breaker
Total Amps
22 Part Number STH042 4/16
Water-cooled Ice Machine
Max. Fuse/
Circuit
Breaker
Warning
Total Amps
Ice Machine
U140
U240
U310
Voltage
Phase Cycle
115/1/60 15 5.0
208-230/1/60 15 2.5
230/1/50 15 2.5
115/1/60 15 7.0
208-230/1/60 15 4.0
230/1/50 15 4.0
115/1/60 15 10.0
208-230/1/60 15 4.5
230/1/50 15 4.5
n
All wiring must conform to local, state and national
codes.
Warning
n
The ice machine must be grounded in accordance
with national and local electrical code.
Part Number STH042 4/16 23
Water Service/Drains
WATER SUPPLY
Local water conditions may require treatment of the
water to inhibit scale formation, filter sediment, and
remove chlorine odor and taste.
Important
If you are installing a Manitowoc water filter system,
refer to the Installation Instructions supplied with the
filter system for ice making water inlet connections.
Warning
n
For ice making, connect to a potable water supply
only.
WATER INLET LINES
Follow these guidelines to install water inlet lines:
• 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, 80 psig (5.5 bar) obtain
a water pressure regulator from your Manitowoc
distributor.
• Install a water shut-off valve for ice making potable
water.
• Insulate water inlet lines to prevent condensation.
24 Part Number STH042 4/16
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 1.5-inch drop per 5 feet of run
(2.5 cm per meter), and must not create traps.
• The floor drain must be large enough to
accommodate drainage from all drains.
• Install a tee to vent the ice machine drain to the
atmosphere.
• Insulate drain lines to prevent condensation.
COOLING TOWER APPLICATIONS
Water Cooled Models Only
A water-cooling tower installation does not require
modification of the ice machine. The water regulator
valve for the condenser continues to control the
refrigeration discharge pressure.
It is necessary to know the amount of heat rejected, and
the pressure drop through the condenser and water
valves (inlet to outlet) when using a cooling tower on an
ice machine.
• Water entering the condenser must not exceed 90°F
(32.2°C).
• Water flow through the condenser must not exceed 5
gallons (19 liters) per minute.
• Allow for a pressure drop of 7 psig (.48 bar) between
the condenser water inlet and the outlet of the ice
machine.
• Water exiting the condenser must not exceed 110°F
(43.3°C).
Caution
,
Plumbing must conform to state and local codes.
Part Number STH042 4/16 25
WATER SUPPLY AND DRAIN LINE SIZING/
CONNECTIONS
U310 only
inside diameter
Machine Fitting
3/8" (9.5 mm) min.
Tubing Size Up to Ice
Ice Machine Fitting
3/8” Female Pipe Thread
Water
Pressure
inside diameter
3/8" (9.5 mm) min.
U310 only
3/8” Female Pipe Thread
inside diameter
1/2” (12.7 mm) min.
1/2” Female Pipe Thread
1/2” Female Pipe Thread
inside diameter
1/2” (12.7 mm) min.
20 psi (138 kPa) min.
Water
Temperature
40°F (4°C) min.
Location
Ice Making
26 Part Number STH042 4/16
80 psi (550 kPa) max.
90°F (32°C) max.
Water Inlet
20 psi (1.38 bar) min.
150 psi (10.3 bar) max.
— — 3/8” Female Pipe Thread
40°F (4°C) min.
90°F (32°C) max
Condenser
Water Inlet
Bin Drain --- --- 1/2” Female Pipe thread
Condenser
Water Drain
Maintenance
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
and Sanitizer. 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
Ice machine cleaner is used to remove lime scale and
mineral deposits. Ice machine sanitizer disinfects and
removes algae and slime.
Part Number STH042 4/16 27
TOUCH PAD OPERATION
Pressing and holding the clean button for 3 seconds
starts the clean cycle. The Clean & On/Off lights energize
indicating the clean cycle has started and ice making will
automatically start when the Clean cycle is complete.
• Setting the ice machine to stop after the clean
cycle: Press the On/Off button. The On/Off light will
de-energize indicating the ice machine will stop after
the clean cycle.
• Pausing the cleaning cycle: Press the Clean button.
The clean light will flash indicating the clean cycle has
paused. Pressing the Clean button again will restart
the clean cycle.
Step 1 Press the On/Off button after ice falls from the
evaporator at the end of a Harvest cycle. Or, press the On/
Off button and allow the ice to melt off the evaporator.
Caution
,
Never use anything to force ice from the evaporator.
Damage may result.
Step 2 Remove all ice from the bin.
Warning
n
Wear rubber gloves and safety goggles (and/or
face shield) when handling Ice Machine Cleaner or
Sanitizer.
28 Part Number STH042 4/16
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.
Step 3 To start a cleaning cycle, press the Clean
button. Water will flow through the water dump valve
and down the drain. Wait until the water trough refills,
then add the proper amount of ice machine cleaner to
the water trough.
Model Amount of Cleaner
U0140 2 ounces (60 ml)
U0190 5 ounces (150 ml)
U0240 5 ounces (150 ml)
U0310 5 ounces (150 ml)
Wait until the clean cycle is complete (approximately 22
minutes) then press the On/Off button and disconnect
power and water supplies to the ice machine.
Step 4 Remove parts for cleaning.
Refer to the proper parts removal for your machine.
Continue with step 5 when the parts have been removed.
Part Number STH042 4/16 29
Step 5 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
Caution
,
Do not immerse electrical connectors or motors
for any components in water, cleaner or sanitizer
solutions.
Use half 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 6 While components are soaking, use half 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.
30 Part Number STH042 4/16
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