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 80-01111-9 7/10

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 W arning box alerts you to a potentia l
personal inju ry situation. Be sure to re ad th e
Warning st atement be fore procee ding, an d work
carefully.
!Caution
Text in a Ca ution b ox 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 Imp ortant box provide s you with
information that may help you pe rform a
procedure more e fficiently. Di sregarding this
information will not cause damage or in jury, but it
may slow you down as you work.

Read These Before Proceeding:
!Caution
Proper inst allation, care and maintenance are
essential for maxi mum performance and trouble-
free ope ration of your Manitowoc equ ipment. If
you encounter pro blems n ot covere d b y this
handbook, do n ot procee d, cont act Mani towoc
Foodservice Grou p. We will b e hap py to provid e
assistance.
Important
Routine a djustments an d mai ntenance
procedures ou tlined in this h andbook a re 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 machin e con tains re frigerant ch arge.
Installation an d b razing of the line set s must b e
performed by a prope rly trained refri geration
technician aware of the Dangers of dealing with
refrigerant charged e quipment. T he technician
must also be US Government Environment al
Protection Agen cy (EP A) certified in prop er
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 80-01111-9 7/10 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 80-01111-9 7/10
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 80-01111-9 7/10 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 80-01111-9 7/10
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 80-01111-9 7/10 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 80-01111-9 7/10
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

Part Number 80-01111-9 7/10 11
General Information
Model Numbers
This manual covers the following models:
*QM Models – the suffix E represents 230 volt/1 ph/50 hz machine.
Self-contained
Air-cooled Self-contained Water-cooled
QM20A* N/A
QM30A* N/A
QM45A* N/A
SM50A N/A
QR0130A QR0131W
QD0132A QD0133W
QY0134A QY0135W
QD0172A N/A
QY0174A N/A
QR0210A QR0211W
QD0212A QD0213W
QY0214A QY0215W
QR0270A QR0271W
QD0272A QD0273W
QY0274A QY0275W
!Warning
An ice machin e con tains h igh voltage electricity
and refri gerant ch arge. Rep airs are to b e
performed by properly trained refri geration
technicians aware of the dangers of d ealing with
high vol tage e lectricity and refrigera nt und er
pressure.

12 Part Number 80-01111-9 7/10
How to Read a Model Number
Accessories
Contact your Manitowoc distributor for these optional
accessories:
BIN CASTER
Replaces standard legs.
MANITOWOC CLEANER AND SANITIZER
Manitowoc Ice Machine Cleaner and Sanitizer are
available in convenient 16 oz. (473 ml) and 1 gal
(3.78 l) bottles. These are the only cleaner and
sanitizer approved for use with Manitowoc products.
* This cleaner must be used with all SM50 ice machines. Evaporator
damage will result with repeated use or high concentrations of P/N
94-0565-3 cleaner with SM50 ice machines.
Cleaner Part Number Sanitizer Part Number
16 oz 94-0456-3 16 oz 94-0565-3
*16 oz 000000084
1 Gallon 4-0580-3 1 Gallon 94-0581-3
A - Air-cooled
W - Water-cooled
0 - Regular, Air-cooled
1 - Regular, Water-cooled
2 - Dice, Air-cooled
3 - Dice, Water-cooled
4 - Half-dice, Air-cooled
5 - Half-dice, Water-cooled
Series Condenser
Type
Capacity
Q R 0130 A
R - Regular
D - Dice
Y - Half-dice
Cube Size

Part Number 80-01111-9 7/10 13
NOTE: The Manitowoc Automatic Cleaning System
(AuCS®) accessory cannot be used with Undercounter
ice machines SM50, QM20, QM30, QM45, Q130,
Q170, Q210, or Q270.
QM20, QM30, QM45 ice machines do not have a
water curtain covering the evaporator. Q130, Q210,
Q170, Q270 have an ice damper that performs the
functions of the water curtain see Ice Damper
Removal/Installation for Details.
!Caution
Use only Ma nitowoc app roved Ice Machine
Cleaner (part nu mber 9 4-0546-3 original gre en
ice machin e cleaner or 000 000084 clea r met al
safe ice ma chine clea ner) a nd San itizer (p art
number 94-0565-3). It is a viola tion of Federal
law to use th ese so lutions in a manner
inconsistent with thei r l abeling. Re ad a nd
understand all lab els printed on bottles before
use.

14 Part Number 80-01111-9 7/10
Model/Serial Number Location
The model and serial numbers are required when
requesting information from your local Manitowoc
distributor, service representative, or Manitowoc Ice.
The model and serial number are listed on the
OWNER WARRANTY REGISTRATION CARD. They
are also listed on the MODEL/SERIAL NUMBER
DECAL affixed to the ice machine.
Q130/Q170/Q210/Q270
Model/Serial Number Location
MODEL/SERIAL
NUMBER PLATE
MODEL/SERIAL
NUMBER PLATE
SV1687G

Part Number 80-01111-9 7/10 15
QM20/QM30
QM45
MODEL/SERIAL
NUMBER PLATE
MODEL/SERIAL
NUMBER PLATE
SV1599
MODEL/SERIAL
NUMBER
PLATE
MODEL/SERIAL
NUMBER PLATE
SV1732

16 Part Number 80-01111-9 7/10
SM50
MODEL/SERIAL
NUMBER PLATE

Part Number 80-01111-9 7/10 17
Ice Machine Warranty Information
OWNER WARRANTY REGISTRATION CARD
General
Warranty coverage begins the day the ice machine is
installed.
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
Q130/Q170/Q210/Q270
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.
SM50/QM20/QM30/QM45
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.
Important
Complete and mail the OWNER W ARRANTY-
REGISTRATION C ARD as soo n as p ossible to
validate the installation date.

18 Part Number 80-01111-9 7/10
Labor
Q130/Q170/Q210/Q270
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 (Q130/
Q170/Q210/Q270 only).
SM50/QM20/QM30/QM45
1. Labor required to repair or replace defective
components is covered for three (3) years from
the date of original installation.
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.

Part Number 80-01111-9 7/10 19
Authorized Warranty Service
To comply with the provisions of the warranty, a
refrigeration service company qualified and authorized
by your Manitowoc distributor, or a Contracted Service
Representative must perform the warranty repair.
Service Calls
Normal maintenance, adjustments and cleaning as
outlined in this manual are not covered by the
warranty.

20 Part Number 80-01111-9 7/10
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?
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.
Product Covered Warranty Period
Ice Machine Twelve (12) months
from the sale date