Manitowoc QM20 Series User manual

Technician’s

Handbook

This manual is updated as new information and models are

released. Visit our website for the latest manual.

www.manitowocice.com

America’s #1 Selling Ice Machine

Manitowoc

QM20/QM30/QM45

SM50

Q130/Q170/Q210/Q270

Undercounter

Ice Machines

Part Number 80-0111-9 6/11

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:

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.

!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.

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 Manitowoc equipment. If

you encounter problems not covered by this

handbook, do not proceed, contact Manitowoc

Foodservice Group. We will be happy to provide

assistance.

Important

Routine adjustments and maintenance

procedures outlined in this handbook are not

covered by the warranty.

!Warning

PERSONAL INJURY POTENTIAL

Do not operate equipment that has been misused,

abused, neglected, damaged, or altered/modified

from that of original manufactured specifications.

!Warning

POTENTIAL PERSONAL INJURY

SITUATION

This ice machine contains refrigerant charge.

Installation and brazing of the line sets must be

performed by a properly trained refrigeration

technician aware of the Dangers of dealing with

refrigerant charged equipment. The technician

must also be US Government Environmental

Protection Agency (EPA) certified in proper

refrigerant handling and servicing procedures.

We reserve the right to make product

improvements at any time. Specifications and

design are subject to change without notice.

Part Number 80-0111-9 6/11 5

Table of Contents

GENERAL INFORMATION

Model Numbers . . . . . . . . . . . . . . . . . . . . .11

How to Read a Model Number . . . . . . . . .12

Accessories . . . . . . . . . . . . . . . . . . . . . . .12

Bin Caster . . . . . . . . . . . . . . . . . . . . . .12

Manitowoc Cleaner and Sanitizer . . . .12

Model/Serial Number Location . . . . . . . .14

Q130/Q170/Q210/Q270 . . . . . . . . . . .14

QM20/QM30 . . . . . . . . . . . . . . . . . . . .15

QM45 . . . . . . . . . . . . . . . . . . . . . . . . .15

Ice Machine Warranty Information . . . . .17

Owner Warranty Registration Card . . .17

Commercial Warranty Coverage . . . . .17

Residential Warranty Coverage . . . . .20

INSTALLATION

Location of Ice Machine . . . . . . . . . . . . . .23

Ice Machine Clearance Requirements . .24

Ice Machine Heat of Rejection . . . . . . . . .24

Leveling the Ice Machine . . . . . . . . . . . . .25

QM45/Q130/Q170/Q210/Q270 . . . . . .25

SM50/QM20/QM30 . . . . . . . . . . . . . . .26

Electrical Requirements . . . . . . . . . . . . . .27

Voltage . . . . . . . . . . . . . . . . . . . . . . . .27

Electrical Specifications . . . . . . . . . . . . .28

Water Service/Drains . . . . . . . . . . . . . . . .31

Water Supply . . . . . . . . . . . . . . . . . . . .31

Water Inlet Lines . . . . . . . . . . . . . . . . .31

Drain Connections . . . . . . . . . . . . . . . .31

Cooling Tower Applications . . . . . . . . .32

COMPONENT IDENTIFICATION

QM45/Q130/Q170/Q210/Q270 . . . . . . . . .37

QM20/QM30 . . . . . . . . . . . . . . . . . . . . . . . .39

SM50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

MAINTENANCE

Ice Machine Inspection . . . . . . . . . . . . . .43

Exterior Cleaning . . . . . . . . . . . . . . . . . . .43

6 Part Number 80-0111-9 6/11

Cleaning the Condenser . . . . . . . . . . . . . 43

Air-cooled Condenser . . . . . . . . . . . . . 44

Water-cooled Condenser and 

Water Regulating Valve . . . . . . . . . . . 44

QM45/Q130/Q170/Q210/Q270 . . . . . . . . . 45

Interior Cleaning and Sanitizing . . . . . 45

QM20/QM30 . . . . . . . . . . . . . . . . . . . . . . . 60

Cleaning and Sanitizing Procedure . . 60

SM50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Cleaning Procedure . . . . . . . . . . . . . . 67

Sanitizing Procedure . . . . . . . . . . . . . 68

Removal of Parts for Cleaning and

Sanitizing . . . . . . . . . . . . . . . . . . . . . . 69

Removal from Service/Winterization . . . 77

General . . . . . . . . . . . . . . . . . . . . . . . . 77

Air-cooled Ice Machines . . . . . . . . . . . 77

Water-cooled Ice Machines . . . . . . . . 78

OPERATION

QM45/Q130/Q170/Q210/Q270 . . . . . . . . . 79

Initial Start-up or Start-up After 

Automatic Shut-off . . . . . . . . . . . . . . . 79

Freeze Sequence . . . . . . . . . . . . . . . . 79

Harvest Sequence . . . . . . . . . . . . . . . 80

Automatic Shut-off . . . . . . . . . . . . . . . 80

Energized Parts Chart . . . . . . . . . . . . 81

QM20/QM30 . . . . . . . . . . . . . . . . . . . . . . . 83

Initial Start-up or Start-up After 

Automatic Shut-off . . . . . . . . . . . . . . . 83

Freeze Sequence . . . . . . . . . . . . . . . . 83

Harvest Sequence . . . . . . . . . . . . . . . 84

Automatic Shut-off . . . . . . . . . . . . . . . 84

Energized Parts Chart . . . . . . . . . . . . 85

SM50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Initial Start-up or Start-up After 

Automatic Shut-off . . . . . . . . . . . . . . . 86

Energized Parts Chart . . . . . . . . . . . . 88

Operational Checks . . . . . . . . . . . . . . . . . 89

QM45/Q130/Q170/Q210/Q270 . . . . . 89

QM20/QM30 . . . . . . . . . . . . . . . . . . . . 92

SM50 . . . . . . . . . . . . . . . . . . . . . . . . . 95

Part Number 80-0111-9 6/11 7

TROUBLESHOOTING

QM45/Q130/Q170/Q210/Q270 . . . . . . . . .99

Diagnosing an Ice Machine

that Will Not Run . . . . . . . . . . . . . . . . .99

Diagnosing Ice Thickness Control 

Circuitry . . . . . . . . . . . . . . . . . . . . . . . .100

Ice Production Check . . . . . . . . . . . . .103

Installation and Visual Inspection 

Checklist . . . . . . . . . . . . . . . . . . . . . . .104

Water System Checklist . . . . . . . . . . .105

Ice Formation Pattern . . . . . . . . . . . . .106

Safety Limit Feature . . . . . . . . . . . . . .108

Analyzing Discharge Pressure . . . . . .115

Analyzing Suction Pressure . . . . . . . .117

Hot Gas Valve . . . . . . . . . . . . . . . . . . .121

Comparing Evaporator Inlet/Outlet

Temperatures . . . . . . . . . . . . . . . . . . .125

Discharge Line Temperature Analysis 126

Refrigeration Component Diagnostic 

Chart . . . . . . . . . . . . . . . . . . . . . . . . . .128

Final Analysis . . . . . . . . . . . . . . . . . . .130

Refrigeration Component Diagnostic Chart

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131

QM20/QM30 . . . . . . . . . . . . . . . . . . . . . . . .134

Diagnosing an Ice Machine

that Will Not Run . . . . . . . . . . . . . . . . .134

Refrigeration Diagnostics . . . . . . . . . .135

Ice Formation Pattern . . . . . . . . . . . . .137

QM45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139

Electrical . . . . . . . . . . . . . . . . . . . . . . .139

Refrigeration Diagnostics . . . . . . . . . .140

Flooding Expansion Valve . . . . . . . . . .143

Starving Expansion Valve/

Low Refrigerant Charge . . . . . . . . . . .143

Overcharged System . . . . . . . . . . . . .143

SM50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144

Diagnosing an Ice Machine

that Will Not Run . . . . . . . . . . . . . . . . .144

Ice Machine Will Not Harvest . . . . . . .145

Ice Quality Is Poor — Cubes are 

Shallow, Incomplete or White . . . . . . .146

8 Part Number 80-0111-9 6/11

Freeze Cycle Is Long, Low Ice 

Production . . . . . . . . . . . . . . . . . . . . . 147

Ice Machine Runs and No Ice 

Is Produced . . . . . . . . . . . . . . . . . . . . 148

Analyzing Discharge Pressure . . . . . . 149

Discharge Pressure High Checklist . . 150

Freeze Cycle Discharge Pressure Low

Checklist . . . . . . . . . . . . . . . . . . . . . . . 150

Analyzing Suction Pressure . . . . . . . . 151

Hot Gas Valve . . . . . . . . . . . . . . . . . . 154

COMPONENT CHECK PROCEDURES

Main Fuse . . . . . . . . . . . . . . . . . . . . . . . . . 159

Function . . . . . . . . . . . . . . . . . . . . . . . 159

Specifications . . . . . . . . . . . . . . . . . . . 159

Check Procedure . . . . . . . . . . . . . . . . 159

Bin Switch . . . . . . . . . . . . . . . . . . . . . . . . 160

QM45/Q130/Q170/Q210/Q270 . . . . . 160

Bin Thermostat . . . . . . . . . . . . . . . . . . . . 164

QM20/QM30 . . . . . . . . . . . . . . . . . . . . 164

SM50 . . . . . . . . . . . . . . . . . . . . . . . . . 166

Liquid Line Thermistor . . . . . . . . . . . . . . 169

QM20/QM30/SM50 . . . . . . . . . . . . . . . 169

Diagnosing Start Components . . . . . . . . 171

Capacitor . . . . . . . . . . . . . . . . . . . . . . 171

Relay . . . . . . . . . . . . . . . . . . . . . . . . . 171

ON/OFF/WASH Toggle Switch . . . . . . . . 172

Function . . . . . . . . . . . . . . . . . . . . . . . 172

Specifications . . . . . . . . . . . . . . . . . . . 172

Check Procedure . . . . . . . . . . . . . . . . 172

QM45/Q130/Q170/Q210/Q270 . . . . . 173

QM20/QM30 . . . . . . . . . . . . . . . . . . . . 173

Ice Thickness Probe . . . . . . . . . . . . . . . . 174

QM45/Q130/Q170/Q210/Q270 . . . . . 174

Ice Thickness Check . . . . . . . . . . . . . 175

Compressor Electrical Diagnostics . . . . 176

Check Resistance (Ohm) Values . . . . 176

Single Phase Compressors . . . . . . . . 176

Check Motor Windings to Ground . . . 176

Compressor Drawing Locked Rotor . . 177

Compressor Drawing High Amps . . . . 177

Fan Cycle Control . . . . . . . . . . . . . . . . . . 178

QM45/Q130/Q170/Q210/Q270 . . . . . 178

Part Number 80-0111-9 6/11 9

High Pressure Cutout (HPCO) Control . .179

QM45/Q130/Q170/Q210/Q270 . . . . . .179

Filter-Driers . . . . . . . . . . . . . . . . . . . . . . . .180

Liquid Line Filter Drier . . . . . . . . . . . . .180

Refrigerant Recovery/Evacuation . . . . . .181

Definitions . . . . . . . . . . . . . . . . . . . . . .181

Refrigerant Re-use Policy . . . . . . . . . .182

Recovery and Recharging . . . . . . . . . .184

System Contamination Cleanup . . . . . . .190

General . . . . . . . . . . . . . . . . . . . . . . . .190

Determining Severity of Contamination 190

Mild System Contamination Cleanup

Procedure . . . . . . . . . . . . . . . . . . . . . .192

Severe System Contamination Cleanup

Procedure . . . . . . . . . . . . . . . . . . . . . .193

Replacing Pressure Controls without

Removing Refrigerant Charge . . . . . . .194

Q270 Condenser Fan Motor 

Replacement . . . . . . . . . . . . . . . . . . . . . . .196

Brazing Procedures for Danfoss Solenoid

Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . .197

COMPONENT SPECIFICATIONS

Main Fuse . . . . . . . . . . . . . . . . . . . . . . . . .199

Bin Switch . . . . . . . . . . . . . . . . . . . . . . . . .199

QM45/Q130/Q170/Q210/Q270 . . . . . .199

Bin Thermostat . . . . . . . . . . . . . . . . . . . . .199

QM20/QM30/SM50 . . . . . . . . . . . . . . .199

ON/OFF/WASH Toggle Switch . . . . . . . . .199

Fan Control Cycle . . . . . . . . . . . . . . . . . . .199

QM45/Q130/Q170/Q210/Q270 . . . . . .199

High Pressure Cutout (HPCO) Control . .200

Filter-Driers . . . . . . . . . . . . . . . . . . . . . . . .200

Liquid Line Thermistor . . . . . . . . . . . . . . .200

QM20/QM30/SM50 . . . . . . . . . . . . . . .200

Total System Refrigerant Charge . . . . . .201

10 Part Number 80-0111-9 6/11

CHARTS

Cycle Times, 24 Hr. Ice Production and

Refrigerant Pressure Charts . . . . . . . . . . 203

QM20 Self-contained Air-cooled . . . . . 204

QM30 Self-contained Air-cooled . . . . . 205

QM45 Self-contained Air-cooled . . . . . 206

QM45 Operating Temperatures . . . . . 207

SM50 Self-contained Air-cooled . . . . . 208

Q130 Self-contained Air-cooled 

(Before Serial Number 310047287) . . 209

Q130 Self-contained Air-cooled

(After Serial Number 310047287) . . . . 210

Q130 Self-contained Water-cooled . . 211

Q170 Self-contained Air-cooled . . . . . 212

Q210 Self-contained Air-cooled . . . . . 213

Q210 Self-contained Water-cooled . . 214

Q270 Self-contained Air-cooled . . . . . 215

Q270 Self-contained Water-cooled . . 216

DIAGRAMS

Wiring Diagrams . . . . . . . . . . . . . . . . . . . 217

QM20 . . . . . . . . . . . . . . . . . . . . . . . . . 218

QM30 . . . . . . . . . . . . . . . . . . . . . . . . . 219

QM30 . . . . . . . . . . . . . . . . . . . . . . . . . 220

QM45 . . . . . . . . . . . . . . . . . . . . . . . . . 221

SM50 . . . . . . . . . . . . . . . . . . . . . . . . . 222

Q130/Q210 . . . . . . . . . . . . . . . . . . . . . 223

Q130/Q170/Q210 . . . . . . . . . . . . . . . . 224

Q270 . . . . . . . . . . . . . . . . . . . . . . . . . . 225

Q270 . . . . . . . . . . . . . . . . . . . . . . . . . . 226

Electronic Control Boards . . . . . . . . . . . 227

Tubing Schematics . . . . . . . . . . . . . . . . . 230

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