Manitowoc MD0420A Manuale utente

Technician’s

Handbook

This manual is updated as new information and models are

released. Visit our website for the latest manual. www.welbilt.cn

M series

Ice Machines

Part Number 040005626 5/17

Manitowoc

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:

NOTE: Text set off as a Note provides you with simple,

but useful, extra information about the procedure you

are performing.

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.

Read These Before Proceeding:

Caution

Proper installation, care and maintenance are

essential for maximum performance and trouble-

free operation of your equipment. Visit our

website www.kool-aire.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.

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.

Part Number 040005626 5/17 9

Table of Contents

GENERAL INFORMATION

Model Numbers . . . . . . . . . . . . . . . . . . . . .13

How to Read a Model Number . . . . . . . . .14

Ice Machine Warranty Information . . . . .15

Commercial Warranty Coverage . . . . .15

Residential Warranty Coverage . . . . .18

INSTALLATION

Location of Ice Machine . . . . . . . . . . . . . .21

Ice Machine Clearance Requirements . .22

Clearance Requirements . . . . . . . . . . . . .22

Ice Machine Heat of Rejection . . . . . . . . .23

Leveling the Ice Machine . . . . . . . . . . . . .23

Electrical Requirements . . . . . . . . . . . . . .24

Water Service/Drains . . . . . . . . . . . . . . . .25

Water Supply . . . . . . . . . . . . . . . . . . . .25

Water Inlet Lines . . . . . . . . . . . . . . . . .25

Drain Connections . . . . . . . . . . . . . . . .26

Cooling Tower Applications . . . . . . . . .26

MAINTENANCE

Interior Cleaning and Sanitizing . . . . . . .29

General . . . . . . . . . . . . . . . . . . . . . . . .29

Cleaning and Sanitizing Procedure . . .29

Toggle switch Operation . . . . . . . . . . .30

Remove Parts for Cleaning . . . . . . . . .34

Preventative Maintenance Cleaning . . . .36

Ice Machine Inspection . . . . . . . . . . . . . .37

Cleaning the Condenser . . . . . . . . . . . . .38

Removal from Service/Winterization . . .39

Air-cooled Models . . . . . . . . . . . . . . . .39

Water-cooled Models . . . . . . . . . . . . .39

10 Part Number 040005626 5/17

OPERATION

Ice Making Sequence of Operation . . . . 41

Control Board Timers . . . . . . . . . . . . 42

Safety Limits . . . . . . . . . . . . . . . . . . . . 43

Energized Parts Chart . . . . . . . . . . . . 45

Operational Checks . . . . . . . . . . . . . . . . . 47

Ice Thickness Check . . . . . . . . . . . . . 47

TROUBLESHOOTING

Control Board Test Mode . . . . . . . . . . . . 49

Diagnosing an Ice Machine that Will Not Run

Ice Machine Does Not Cycle Into Harvest

when Water Loses Contact with the Harvest

Float Switch . . . . . . . . . . . . . . . . . . . . . . . 51

Ice Machine Cycles Into Harvest Before Water

loses Contact with the Harvest Float Switch

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Ice Production Check . . . . . . . . . . . . . . . 54

Installation/Visual Inspection Checklist 55

Water System Checklist . . . . . . . . . . . . . 56

Ice Formation Pattern . . . . . . . . . . . . . . . 57

Safety Limits . . . . . . . . . . . . . . . . . . . . 60

Analyzing Discharge Pressure . . . . . . . . 67

Analyzing Suction Pressure . . . . . . . . . . 69

Harvest Valve . . . . . . . . . . . . . . . . . . . . . . 73

Comparing Evaporator Inlet/Outlet

Temperatures . . . . . . . . . . . . . . . . . . . . . . 77

Discharge Line Temperature Analysis . 78

Refrigeration Component Diagnostics . 80

Final Analysis . . . . . . . . . . . . . . . . . . . 82

Refrigeration Component Diagnostic Chart

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

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