Manitowoc UD0140A, UR0140AE, UD0140AE, UR0140A, UD0190A Technician's Handbook

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 trouble­free 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

Typ e

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. 26

th

St.,

P.O. Box 1720

Manitowoc, WI 54221-1720

Telephone: [phone] Fax: [phone]

www.manitowocice.com

20 Part Number STH042 7/15

THIS PAGE INTENTIONALLY LEFT BLANK

Part Number STH042 7/15 21

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.

Installation

22 Part Number STH042 7/15

Ice Machine Clearance Requirements

Self-contained

Air-cooled

Self-contained

Water-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.

Ice Machine Heat of Rejection

Series

Ice Machine

Heat of Rejection*

Air Conditioning** Peak

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.

Part Number STH042 7/15 23

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

24 Part Number STH042 7/15

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 7/15 25

Electrical Specifications

Air-cooled Ice Machine

Ice Machine

Voltage

Phase Cycle

Max. Fuse/

Circuit

Breaker

Total Amps

U140

115/1/60 15 5.0

208-230/1/60 15 2.5

230/1/50 15 2.5

U190

115/1/60 15 6.0

208-230/1/60 15 2.5

230/1/50 15 2.5

U240

115/1/60 15 7.0

208-230/1/60 15 4.0

230/1/50 15 4.0

U310

115/1/60 15 10.0

208-230/1/60 15 4.5

230/1/50 15 4.5

26 Part Number STH042 7/15

Water-cooled Ice Machine

Ice Machine

Voltage

Phase Cycle

Max. Fuse/

Circuit

Breaker

Total Amps

U140

115/1/60 15 5.0

208-230/1/60 15 2.5

230/1/50 15 2.5

U240

115/1/60 15 7.0

208-230/1/60 15 4.0

230/1/50 15 4.0

U310

115/1/60 15 10.0

208-230/1/60 15 4.5

230/1/50 15 4.5



Warning

All wiring must conform to local, state and national
codes.



Warning

The ice machine must be grounded in accordance
with national and local electrical code.

Part Number STH042 7/15 27

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

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.

28 Part Number STH042 7/15

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 7/15 29

WATER SUPPLY AND DRAIN LINE SIZING/
CONNECTIONS

Location

Water

Temperature

Water

Pressure

Ice Machine

Fitting

Tubing Size Up

to Ice Machine

Fitting

Ice Making

Water Inlet

40°F (4°C) min.

90°F (32°C) max.

20 psi (138 kPa) min.

80 psi (550 kPa) max.

3/8” Female

Pipe Thread

3/8" (9.5 mm) min.

inside diameter

Condenser

Water Inlet

40°F (4°C) min.

90°F (32°C) max

20 psi (1.38 bar) min.

150 psi (10.3 bar) max.

3/8” Female

Pipe Thread

3/8" (9.5 mm) min.

inside diameter

Condenser

Water Drain

——

3/8” Female

Pipe Thread

3/8" (9.5 mm) min.

inside diameter

30 Part Number STH042 7/15

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