Manitowoc STH042 7/15 User manual

Part Number STH042 7/15
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

Safety Notices
As you work on Manitowoc 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.
Throughout this handbook, you will see the following
types of safety notices:
Warning
Text in a Warning box alerts you to a potential
personal injury situation. Be sure to read the Warning
statement before proceeding, and work carefully.
Caution
Text in a Caution box alerts you to a situation in which
you could damage the equipment. Be sure to read
the Caution statement before proceeding, and work
carefully.

Procedural Notices
As you work on Manitowoc equipment, be sure to read
the procedural notices in this handbook. These notices
supply helpful information which may assist you as you
work.
Throughout this handbook, you will see the following
types of procedural notices:
Important
Text in an Important box provides you with
information that may help you perform a procedure
more efficiently. Disregarding this information will
not cause damage or injury, but it may slow you
down as you work.
NOTE: Text set off as a Note provides you with simple, but
useful, extra information about the procedure you are
performing.

Read These Before Proceeding:
Caution
Proper installation, care and maintenance are
essential for maximum performance and trouble-
free operation of your Manitowoc equipment. If you
encounter problems not covered by this manual, do
not proceed, contact Manitowoc Foodservice. We will
be happy to provide assistance.
Caution
Proper installation, care and maintenance are
essential for maximum performance and trouble-free
operation of your equipment. Visit our website www.
manitowocfsg.com for manual updates, translations,
or contact information for service agents in your area.
Important
Routine adjustments and maintenance procedures
outlined in this handbook are not covered by the
warranty.
Warning
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.

Warning
Do not use electrical appliances or accessories other
than those supplied by Manitowoc for your ice
machine model.
Warning
Two or more people or a lifting device are required to
lift this appliance.
Warning
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.
Warning
Do not damage the refrigeration circuit when installing,
maintaining or servicing the unit.
Important
This product is hermetically sealed and contains
fluorinated greenhouse gas R404A

Warning
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 this appliance.
Warning
All covers and access panels must be in place and
properly secured, before operating this equipment.
Warning
Do not obstruct machine vents or openings.
Warning
Do not store gasoline or other flammable vapors or
liquids in the vicinity of this or any other appliance.
Warning
Do not clean with water jet.
Warning
It is the responsibility of the equipment owner to
perform a Personal Protective Equipment Hazard
Assessment to ensure adequate protection during
maintenance procedures.
Warning
Two or more people are required to move this
equipment to prevent tipping.

Warning
When using electric appliances, basic precautions
must always be followed, including the following:
a. Read all the instructions before using the
appliance.
b. To reduce the risk of injury, close supervision
is necessary when an appliance is used near
children.
c. Do not contact moving parts.
d. Only use attachments recommended or sold
by the manufacturer.
e. Do not use outdoors.
f. 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.
g. Follow applicable lock out tag out procedures
before working on equipment.
h. Connect to a properly grounded outlet only.
We reserve the right to make product improvements at
any time. Specifications and design are subject to change
without notice.

Table of Contents
Part Number STH042 7/15 9
General Information
Model Numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
How to Read a Model Number . . . . . . . . . . . . . . . . 14
Ice Machine Warranty Information. . . . . . . . . . . . 15
Commercial Warranty Coverage. . . . . . . . . . . . 15
Residential Warranty Coverage. . . . . . . . . . . . . 17
How to Obtain Warranty Service . . . . . . . . . . . 19
Installation
Location of Ice Machine. . . . . . . . . . . . . . . . . . . . . . . 21
Ice Machine Clearance Requirements. . . . . . . . . 22
Ice Machine Heat of Rejection . . . . . . . . . . . . . . . . 22
Leveling the Ice Machine. . . . . . . . . . . . . . . . . . . . . . 23
Electrical Requirements. . . . . . . . . . . . . . . . . . . . . . . 24
Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . 25
Water Service/Drains . . . . . . . . . . . . . . . . . . . . . . . . . 27
Water Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Water Inlet Lines . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Drain Connections . . . . . . . . . . . . . . . . . . . . . . . . 28
Cooling Tower Applications. . . . . . . . . . . . . . . . 28
Water Supply and Drain Line Sizing/
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Maintenance
Interior Cleaning and Sanitizing . . . . . . . . . . . . . . 31
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Cleaning and Sanitizing Procedure. . . . . . . . . 31
Touch Pad Operation . . . . . . . . . . . . . . . . . . . . . . 32
Remove Parts for Cleaning. . . . . . . . . . . . . . . . . 36
Preventative Maintenance Cleaning . . . . . . . . . . 41
Ice Machine Inspection . . . . . . . . . . . . . . . . . . . . . . . 42
Cleaning the Condenser . . . . . . . . . . . . . . . . . . . . . . 43
Removal from Service/Winterization . . . . . . . . . 44
Bin Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

10 Part Number STH042 7/15
Operation
Touch Pad Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Clean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Bin Full. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Ice Making Sequence of Operation . . . . . . . . . . . 50
Control Board Timers . . . . . . . . . . . . . . . . . . . . . . 52
Safety Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Energized Parts Chart. . . . . . . . . . . . . . . . . . . . . . 55
Operational Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Ice Thickness Check . . . . . . . . . . . . . . . . . . . . . . . 57
Ice Thickness Adjustment. . . . . . . . . . . . . . . . . . 57
Troubleshooting
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
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Final Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Refrigeration Component Diagnostic Chart 94

Part Number STH042 7/15 11
Component Check Procedures
Main Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Bin Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Touch Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Float Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Compressor Electrical Diagnostics . . . . . . . . . . . 104
Fan Cycle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
High Pressure Cutout (HPCO) Control. . . . . . . . 107
Filter-Driers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Refrigerant Recovery/Evacuation. . . . . . . . . . . . 109
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Refrigerant Re-use Policy . . . . . . . . . . . . . . . . . 110
Recovery and Recharging Procedures . . . . 112
System Contamination Cleanup . . . . . . . . . . . . . 115
Determining Severity of Contamination. . . 115
Mild System Contamination Cleanup
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Severe System Contamination Cleanup
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Replacing Pressure Controls without
Removing Refrigerant Charge. . . . . . . . . . . . . 119
Total System Refrigerant Charge. . . . . . . . . . . . . 121

12 Part Number STH042 7/15
Charts
Cycle Times, 24 Hr. Ice Production and
Refrigerant Pressure Charts. . . . . . . . . . . . . . . . . . 123
U0140 Self-contained Air-cooled. . . . . . . . . . 124
U0140 Self-contained Water-cooled. . . . . . . 125
U0190 Self-contained Air-cooled. . . . . . . . . . 126
U0240 Self-contained Air-cooled. . . . . . . . . . 127
U0240 Self-contained Water-cooled. . . . . . . 128
U0310 Self-contained Air-cooled. . . . . . . . . . 129
U0310 Self-contained Water-cooled. . . . . . . 130
Diagrams
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Wiring Diagrams
U140/U190/U240 wiring diagram . . . . . . . . . 132
Electronic Control Board. . . . . . . . . . . . . . . . . . 134
Tubing Schematic - U0140 . . . . . . . . . . . . . . . . . . . 135
Tubing Schematic - U0190/U0240/U0310. . . . 136

Part Number STH042 7/15 13
Model Numbers
This manual covers the following models:
Self-contained
Air-cooled
Self-contained
Water-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 –
General Information

14 Part Number STH042 7/15
How to Read a Model Number
U D 0140 A E
Cube Size
Series
Capacity
Condenser
Type
E - WRAS 50Hz
A - Air-cooled
W - Water-cooled
R - Regular
D - Dice
Y - Half-dice
Warning
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.

Part Number STH042 7/15 15
Ice Machine Warranty Information
Owner Warranty Registration Card
General
Warranty coverage begins the day the ice machine is
installed.
Important
Complete and mail the OWNER WARRANTY
REGISTRATION CARD as soon as possible to validate
the installation date.
If the OWNER WARRANTY REGISTRATION CARD is not
returned, 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, if you need further warranty information.
Parts
1. 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.
2. The evaporator and compressor are covered by an
additional two (2) year (five years total) warranty
beginning on the date of the original installation.
Labor
1. Labor required to repair or replace defective
components is covered for three (3) years from the
date of original installation.
2. The evaporator is covered by an additional two- (2)
year (five years total) labor warranty beginning on
the date of the original installation.

16 Part Number STH042 7/15
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.
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.
7. This warranty is intended exclusively for commercial
application. No warranty is extended for personal,
family, or household purposes.
Authorized Warranty Service
To comply with the provisions of the warranty, a
refrigeration service company qualified and authorized
by your Manitowoc distributor, or a Factory Authorized
Servicer must perform the warranty repair.
Service Calls
Normal maintenance, adjustments and cleaning as
outlined in this manual are not covered by the warranty.

Part Number STH042 7/15 17
RESIDENTIAL WARRANTY COVERAGE
What Does this Limited Warranty Cover?
Subject to the exclusions and limitations below,
Manitowoc Ice (“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?
Product Covered Warranty Period
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.

18 Part Number STH042 7/15
What Is Not Covered?
This limited warranty does 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.

Part Number STH042 7/15 19
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 above. Retain a copy for
your records.
HOW TO OBTAIN WARRANTY SERVICE
To obtain warranty service or information regarding your
Product, please contact us at:
MANITOWOC ICE
2110 S. 26th St.,
P.O. Box 1720
Manitowoc, WI 54221-1720
Telephone: [phone] Fax: [phone]
www.manitowocice.com

20 Part Number STH042 7/15
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