Manitowoc SM050 User manual

Undercounter Ice Machines
QM20 / QM30 / QM45 / SM050
Q130 / Q170 / Q210 / Q270
Technicians Handbook
Part Number 8001119 10/19

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:
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.
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:
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.
!Warning
!Caution
Important

Read These Before Proceeding:
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.
Routine adjustments and maintenance
procedures outlined in this handbook are not
covered by the warranty.
PERSONAL INJURY POTENTIAL
Do not operate equipment that has been misused,
abused, neglected, damaged, or altered/modified
from that of original manufactured specifications.
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.
!Caution
Important
!Warning
!Warning

Part Number 8001119 10/19 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

6 Part Number 8001119 10/19
MAINTENANCE
Ice Machine Inspection . . . . . . . . . . . . . . 43
Exterior Cleaning . . . . . . . . . . . . . . . . . . . 43
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
Self-contained 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

Part Number 8001119 10/19 7
Operational Checks . . . . . . . . . . . . . . . . . 89
QM45/Q130/Q170/Q210/Q270 . . . . . . 89
QM20/QM30 . . . . . . . . . . . . . . . . . . . . 92
SM50 . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Delay Start . . . . . . . . . . . . . . . . . . . . . . . . . 96
Repeat Delay Period Every 24 Hours . 96
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

8 Part Number 8001119 10/19
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
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

Part Number 8001119 10/19 9
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
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 Procedures 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 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 8001119 10/19
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