Manitowoc Q130 Specifications

Manitowoc Q130 Specifications
Manitowoc
QM20/QM30/QM45
SM50
Q130/Q170/Q210/Q270
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
America’s #1 Selling Ice Machine
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:
! 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 ale rts you to a si tuation i n
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 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.
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 inst allation, care and maintenance are
essential for maxi mum performance and troubl efree 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 w ill 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.
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
Part Number 80-01111-9 7/10
5
Cleaning the Condenser . . . . . . . . . . . . .
Air-cooled Condenser . . . . . . . . . . . . .
Water-cooled Condenser and 
Water Regulating Valve . . . . . . . . . . .
QM45/Q130/Q170/Q210/Q270 . . . . . . . . .
Interior Cleaning and Sanitizing . . . . .
QM20/QM30 . . . . . . . . . . . . . . . . . . . . . . .
Cleaning and Sanitizing Procedure . .
SM50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning Procedure . . . . . . . . . . . . . .
Sanitizing Procedure . . . . . . . . . . . . .
Removal of Parts for Cleaning and
Sanitizing . . . . . . . . . . . . . . . . . . . . . .
Removal from Service/Winterization . . .
General . . . . . . . . . . . . . . . . . . . . . . . .
Air-cooled Ice Machines . . . . . . . . . . .
Water-cooled Ice Machines . . . . . . . .
OPERATION
QM45/Q130/Q170/Q210/Q270 . . . . . . . . .
Initial Start-up or Start-up After 
Automatic Shut-off . . . . . . . . . . . . . . .
Freeze Sequence . . . . . . . . . . . . . . . .
Harvest Sequence . . . . . . . . . . . . . . .
Automatic Shut-off . . . . . . . . . . . . . . .
Energized Parts Chart . . . . . . . . . . . .
QM20/QM30 . . . . . . . . . . . . . . . . . . . . . . .
Initial Start-up or Start-up After 
Automatic Shut-off . . . . . . . . . . . . . . .
Freeze Sequence . . . . . . . . . . . . . . . .
Harvest Sequence . . . . . . . . . . . . . . .
Automatic Shut-off . . . . . . . . . . . . . . .
Energized Parts Chart . . . . . . . . . . . .
SM50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Start-up or Start-up After 
Automatic Shut-off . . . . . . . . . . . . . . .
Energized Parts Chart . . . . . . . . . . . .
Operational Checks . . . . . . . . . . . . . . . . .
QM45/Q130/Q170/Q210/Q270 . . . . .
QM20/QM30 . . . . . . . . . . . . . . . . . . . .
SM50 . . . . . . . . . . . . . . . . . . . . . . . . .
6
43
44
44
45
45
60
60
67
67
68
69
77
77
77
78
79
79
79
80
80
81
83
83
83
84
84
85
86
86
88
89
89
92
95
Part Number 80-01111-9 7/10
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
Part Number 80-01111-9 7/10
7
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 . . . . . . . . . . . . . . . . . . . . . . . . .
Function . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . .
Check Procedure . . . . . . . . . . . . . . . .
Bin Switch . . . . . . . . . . . . . . . . . . . . . . . .
QM45/Q130/Q170/Q210/Q270 . . . . .
Bin Thermostat . . . . . . . . . . . . . . . . . . . .
QM20/QM30 . . . . . . . . . . . . . . . . . . . .
SM50 . . . . . . . . . . . . . . . . . . . . . . . . .
Liquid Line Thermistor . . . . . . . . . . . . . .
QM20/QM30/SM50 . . . . . . . . . . . . . . .
Diagnosing Start Components . . . . . . . .
Capacitor . . . . . . . . . . . . . . . . . . . . . .
Relay . . . . . . . . . . . . . . . . . . . . . . . . .
ON/OFF/WASH Toggle Switch . . . . . . . .
Function . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . .
Check Procedure . . . . . . . . . . . . . . . .
QM45/Q130/Q170/Q210/Q270 . . . . .
QM20/QM30 . . . . . . . . . . . . . . . . . . . .
Ice Thickness Probe . . . . . . . . . . . . . . . .
QM45/Q130/Q170/Q210/Q270 . . . . .
Ice Thickness Check . . . . . . . . . . . . .
Compressor Electrical Diagnostics . . . .
Check Resistance (Ohm) Values . . . .
Single Phase Compressors . . . . . . . .
Check Motor Windings to Ground . . .
Compressor Drawing Locked Rotor . .
Compressor Drawing High Amps . . . .
Fan Cycle Control . . . . . . . . . . . . . . . . . .
QM45/Q130/Q170/Q210/Q270 . . . . .
8
159
159
159
159
160
160
164
164
166
169
169
171
171
171
172
172
172
172
173
173
174
174
175
176
176
176
176
177
177
178
178
Part Number 80-01111-9 7/10
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
Part Number 80-01111-9 7/10
9
CHARTS
Cycle Times, 24 Hr. Ice Production and
Refrigerant Pressure Charts . . . . . . . . . .
QM20 Self-contained Air-cooled . . . . .
QM30 Self-contained Air-cooled . . . . .
QM45 Self-contained Air-cooled . . . . .
QM45 Operating Temperatures . . . . .
SM50 Self-contained Air-cooled . . . . .
Q130 Self-contained Air-cooled 
(Before Serial Number 310047287) . .
Q130 Self-contained Air-cooled
(After Serial Number 310047287) . . . .
Q130 Self-contained Water-cooled . .
Q170 Self-contained Air-cooled . . . . .
Q210 Self-contained Air-cooled . . . . .
Q210 Self-contained Water-cooled . .
Q270 Self-contained Air-cooled . . . . .
Q270 Self-contained Water-cooled . .
DIAGRAMS
Wiring Diagrams . . . . . . . . . . . . . . . . . . .
QM20 . . . . . . . . . . . . . . . . . . . . . . . . .
QM30 . . . . . . . . . . . . . . . . . . . . . . . . .
QM30 . . . . . . . . . . . . . . . . . . . . . . . . .
QM45 . . . . . . . . . . . . . . . . . . . . . . . . .
SM50 . . . . . . . . . . . . . . . . . . . . . . . . .
Q130/Q210 . . . . . . . . . . . . . . . . . . . . .
Q130/Q170/Q210 . . . . . . . . . . . . . . . .
Q270 . . . . . . . . . . . . . . . . . . . . . . . . . .
Q270 . . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Control Boards . . . . . . . . . . .
Tubing Schematics . . . . . . . . . . . . . . . . .
10
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
230
Part Number 80-01111-9 7/10
General Information
Model Numbers
This manual covers the following models:
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
*QM Models – the suffix E represents 230 volt/1 ph/50 hz machine.
! 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 a ware of the dangers of d ealing with
high vol tage e lectricity and refrigera nt und er
pressure.
Part Number 80-01111-9 7/10
11
How to Read a Model Number
Cube Size
Capacity
Condenser
Type
Series
Q R 0130 A
A - Air-cooled
W - Water-cooled
R - Regular
D - Dice
Y - Half-dice
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
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.
Cleaner Part Number
16 oz
94-0456-3
*16 oz
000000084
1 Gallon
4-0580-3
Sanitizer Part Number
16 oz
94-0565-3
1 Gallon 94-0581-3
* 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.
12
Part Number 80-01111-9 7/10
! 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.
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.
Part Number 80-01111-9 7/10
13
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 PLATE
MODEL/SERIAL
NUMBER PLATE
SV1687G
Model/Serial Number Location
14
Part Number 80-01111-9 7/10
QM20/QM30
MODEL/SERIAL
NUMBER PLATE
MODEL/SERIAL
NUMBER PLATE
SV1599
QM45
MODEL/SERIAL
NUMBER PLATE
MODEL/SERIAL
NUMBER
PLATE
SV1732
Part Number 80-01111-9 7/10
15
SM50
MODEL/SERIAL
NUMBER PLATE
16
Part Number 80-01111-9 7/10
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 W ARRANTYREGISTRATION C ARD as soo n as p ossible 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
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.
Part Number 80-01111-9 7/10
17
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.
18
Part Number 80-01111-9 7/10
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.
Part Number 80-01111-9 7/10
19
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.
20
Part Number 80-01111-9 7/10
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 80-01111-9 7/10
21
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. 26th St.,
P.O. Box 1720
Manitowoc, WI 54221-1720
Telephone: 920-682-0161 Fax: 920-683-7585
www.manitowocice.com
22
Part Number 80-01111-9 7/10
Installation
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:
• Q130/Q170/Q210/Q270/QM45 must be at
least 40°F (4°C) but must not exceed 110°F
(43.4°C).
• QM20/QM30 must be at least 50°F (10°C) but
must not exceed 113°F (45°C).
• SM50 must be at least 50°F (10°C) but must
not exceed 110°F (43°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.
Part Number 80-01111-9 7/10
23
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)*
*NOTE: 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
Heat of Rejection*
Series
Ice Machine
Air Conditioning**
Peak
SM50
1145
2300
QM20
1450
2100
QM30
1600
2350
QM45
1750
2600
Q130
2100
3300
Q170
2200
2600
Q210
2400
3400
Q270
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
air-cooled ice machines are installed.
24
Part Number 80-01111-9 7/10
Leveling the Ice Machine
QM45/Q130/Q170/Q210/Q270
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 leg s must be screwe d in tightly to preven t
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.
NOTE: An optional 2-1/2" (6.35 cm) caster assembly is
available for use in place of the legs on the Q130,
Q170, Q210, Q270, or QM45. Installation instructions
are supplied with the casters.
THREAD
LEVELING LEG
INTO BASE OF
CABINET
THREAD “FOOT”
IN AS FAR AS
POSSIBLE
SV1606
Leg Installation
Part Number 80-01111-9 7/10
25
SM50/QM20/QM30
After moving the ice machine into the installation
location, it must be leveled for proper operation.
Follow these steps to level the ice machine:
1. Use a level to check the levelness of the ice
machine from front to back and from side to side.
2. If the ice machine is not level, adjust the leveling
glides or legs on each corner of the base of the
ice machine as necessary.
3. Check the levelness of the ice machine after each
adjustment.
4. Repeat steps 2 and 3 until the ice machine is level
from front to back and from side to side.
SV1705
Levelers
SV1679B
SV1606
Legs
26
Part Number 80-01111-9 7/10
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).
The 115/1/60 ice machines are factory pre-wired with
a 6' (1.8 m) power cord, and NEMA 5-15P-plug
configuration.
The 208-230/1/60 and 230/1/50 ice machines are
factory pre-wired with a power cord only, no plug is
supplied.
FUSE/CIRCUIT BREAKER
A separate fuse/circuit breaker must be provided for
each ice machine. Circuit breakers must be H.A.C.R.
rated (does not apply in Canada).
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 80-01111-9 7/10
27
Electrical Specifications
Q130/Q170/Q210/Q270 Air-cooled Ice Machine
Ice Machine
Voltage
Phase Cycle
Max. Fuse/
Circuit
Breaker
Total
Amps
Q130
(Before
Serial Number
310047287)
115/1/60
15 amp
7.6
208-230/1/60
15 amp
3.3
230/1/50
15 amp
3.3
Q130
(After
Serial Number
310047287)
115/1/60
15 amp
7.0
208/1/60
15 amp
3.1
230/1/50
15 amp
3.0
Q170
115/1/60
15 amp
7.0
115/1/60
15 amp
6.5
208-230/1/60
15 amp
3.6
230/1/50
15 amp
3.6
Q210
Q270
Danfoss
Q270
Tecumseh
28
115/1/60
15 amp
10.7
208-230/1/60
15 amp
5.2
230/1/50
15 amp
5.2
115/1/60
15 amp
8.5
208-230/1/60
15 amp
4.5
230/1/50
15 amp
4.5
Part Number 80-01111-9 7/10
Q130/Q210/Q270 Water-cooled Ice Machine
Ice Machine
Voltage
Phase Cycle
Max. Fuse/
Circuit
Breaker
Total
Amps
Q130
(Before
Serial Number
310047287)
115/1/60
15 amp
6.8
208-230/1/60
15 amp
2.8
230/1/50
15 amp
2.8
Q130
(After
Serial Number
310047287)
115/1/60
15 amp
6.3
208/1/60
15 amp
2.6
Q210
Q270
Danfoss
Q270
Tecumseh
230/1/50
15 amp
2.5
115/1/60
15 amp
6.1
208-230/1/60
15 amp
3.1
230/1/50
15 amp
3.1
115/1/60
15 amp
9.9
208-230/1/60
15 amp
4.7
230/1/50
15 amp
4.7
115/1/60
15 amp
7.7
208-230/1/60
15 amp
4.0
230/1/50
15 amp
4.0
! 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 80-01111-9 7/10
29
QM20/QM30/QM45 Air-cooled Ice Machine
Ice
Machine
QM20
QM30
QM45
Voltage Phase
Cycle
Max. Fuse/
Circuit
Breaker
Total
Amps
115/1/60
15 amp
3.5
230/1/50
15 amp
1.5
115/1/60
15 amp
5.3
230/1/50
15 amp
2.6
115/1/60
15 amp
5.2
230/1/50
15 amp
2.6
SM50 Air-cooled Ice Machine
Ice
Machine
Voltage Phase
Cycle
Max. Fuse/
Circuit
Breaker
Total
Amps
SM50
115/1/60
15 amp
4.1
30
Part Number 80-01111-9 7/10
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 yo u are inst alling a Man itowoc w ater filter
system, refer to t he Installation Inst ructions
supplied with the filter system for ice making
water inlet connections.
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.
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.
• Run separate bin and ice machine drain lines.
Insulate them to prevent condensation.
• Vent the bin and ice machine drain to the
atmosphere.
Part Number 80-01111-9 7/10
31
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
32
Part Number 80-01111-9 7/10
Water
Pressure
20 psi (1.38 bar) min.
80 psi (5.5 bar) max.
20 psi (1.38 bar) min.
150 psi (10.3 bar) max.
—
—
Water
Temperature
33°F (0.6°C) min.
90°F (32.2°C) max.
33°F (0.6°C) min.
90°F (32.2°C) max.
—
—
Location
Ice Making
Water Inlet
Condenser
Water Inlet
Condenser
Water Drain
Bin Drain
3/8" (9.5 mm) min.
inside diameter
3/8" (9.5 mm) min.
inside diameter
1/2" (12.7 mm)
min. inside
diameter
3/8" Female
Pipe Thread
1/2" Female
Pipe Thread
3/8" (9.5 mm) min.
inside diameter
Tubing Size Up to
Ice Machine
Fitting
3/8" Female
Pipe Thread
3/8" Female
Pipe Thread
Ice Machine
Fitting
WATER SUPPLY AND DRAIN LINE SIZING/
CONNECTIONS
QM45/Q130/Q170/Q210/Q270
Part Number 80-01111-9 7/10
33
34
Tubing Size Up to
Ice Machine
Fitting
3/8" (.95 cm) min.
inside diameter
5/8" (1.59 cm) min.
inside diameter
Ice Machine
Fitting
3/4" Male
Connection
5/8" (1.59 cm)
inside
diameter
flexible hose
Water
Pressure
34.8 psi (2.4 bar) min.
89.9 psi (6.2 bar) max.
—
Water
Temperature
50°F (10°C) min.
86°F (30°C) max.
—
Location
Ice Making
Water Inlet
Bin Drain
QM20/QM30
Part Number 80-01111-9 7/10
Part Number 80-01111-9 7/10
20 psi (1.38 bar) min.
80 psi (5.5 bar) max.
—
—
50°F (10°C) min.
90°F (32.2°C) max.
—
—
Ice Making
Water Inlet
Bin Drain
Drain Pump
Tubing Size Up to
Ice Machine
Fitting
1/4" (.64 cm) min.
inside diameter
3/4" (1.9 cm) min.
inside diameter
3/8" (.96 cm) min.
inside diameter
Ice Machine
Fitting
1/4" (.64 cm)
ID Copper
Tubing
3/4" (1.9 cm)
Hose Barb
3/8" (.96 cm)
Hose
Note: If air temperature is less than 60°F (15.5°C) water temperature must be equal or greater
than 50°F (10°C).
Water
Pressure
Water
Temperature
Location
SM50
35
This Page Intentionally Left Blank
36
Part Number 80-01111-9 7/10
Component Identification
QM45/Q130/Q170/Q210/Q270
ICE THICKNESS
PROBE
DISTRIBUTION
TUBE (Q210/Q270
SHOWN)
EVAPORATOR
(Q210/Q270
SHOWN)
ICE
DAMPER
WATER
TROUGH
WATER
PUMP
SV1694A
FLOAT VALVE
SIPHON CAP
BIN SWITCH
MAGNET
SV1695A
Evaporator Compartment
Part Number 80-01111-9 7/10
37
ON/OFF/WASH
TOGGLE
SWITCH
CONDENSER AIR
FILTER
COMPRESSOR
COMPARTMENT
ACCESS SCREWS
SV1686G
QM45/Q130/Q170/Q210 Ice Machines
ON/OFF/WASH
TOGGLE
SWITCH
COMPRESSOR
COMPARTMENT ACCESS
SCREWS
CONDENSER AIR FILTER
PT1288
Q270 Ice Machines
38
Part Number 80-01111-9 7/10
QM20/QM30
WATER
DISTRIBUTION
TUBE
WATER PUMP
AND
BRACKET
ASSEMBLY
WATER
PUMP
OUTLET
HOSE
OVERFLOW
TUBE
EVAPORATOR
ASSEMBLY
WATER
TROUGH
Part Number 80-01111-9 7/10
SV1716A
39
ON/OFF/WASH
TOGGLE
SWITCH
SV1711
QM20 Ice Machines
CONDENSER
AIR FILTER
ON/OFF/WASH
TOGGLE
SWITCH
SV1681A
QM30 Ice Machines
40
Part Number 80-01111-9 7/10
SM50
CONTROL
PANEL
BIN LIGHT
WATER
SHUTTERS
EVAPORATOR
COMPARTMENT
WATER
FILTER
BIN
BIN
THERMOSTAT
GRILL
WATER
PUMP
ELECTRICAL
DRAIN
PUMP
REFRIGERATION
COMPRESSOR
WATER
INLET
DRAIN
Part Number 80-01111-9 7/10
41
WATER
PUMP
EVAPORATOR
WATER
SHUTTER
ASSEMBLY
WATER
SUPPLY
LINE
NOTE:
EVAPORATOR
REMOVED
FOR CLARITY
EVAPORATOR
BUCKET
SPRAY
BAR
SPRAY
NOZZLES
WATER
SHUTTERS
CONTROL
BOARD
42
Part Number 80-01111-9 7/10
Maintenance
Ice Machine Inspection
Check all water fittings and lines for leaks. Also, make
sure the refrigeration tubing is not rubbing or vibrating
against other tubing, panels, etc.
Do not put anything (boxes, etc.) in front of the ice
machine. There must be adequate airflow through and
around the ice machine to maximize ice production
and ensure long component life.
Exterior Cleaning
Clean the area around the ice machine as often as
necessary to maintain cleanliness and efficient
operation.
Sponge any dust and dirt off the outside of the ice
machine with mild soap and water. Wipe dry with a
clean, soft cloth.
A commercial grade stainless steel cleaner/polish can
be used as necessary.
Cleaning the Condenser
! Warning
Disconnect electric powe r to the ice machine a t
the e lectric service s witch before clean ing the
condenser.
! Caution
If you are cleaning the condenser fan blades with
water, cover the fan motor to prev ent water
damage.
CONDENSER
COMB
DOWN
ONLY
Part Number 80-01111-9 7/10
FIN COMB
43
AIR-COOLED CONDENSER
A dirty condenser restricts airflow, resulting in excessively
high operating temperatures. This reduces ice production
and shortens component life. Clean the condenser at least
every six months. Follow the steps below.
! Warning
The conde nser fi ns are sharp. Use care whe n
cleaning them.
1. The washable aluminum filter on self-contained aircooled ice machines is designed to catch dust, dirt, lint
and grease. This helps keep the condenser clean.
Clean the filter with a mild soap and water solution.
2. Clean the outside of the condenser with a soft brush or a
vacuum with a brush attachment. Clean from top to
bottom, not side to side. Be careful not to bend the
condenser fins.
3. Shine a flashlight through the condenser to check for dirt
between the fins. If dirt remains:
A. Blow compressed air through the condenser fins
from the inside. Be careful not to bend the fan
blades.
B. Use a commercial condenser coil cleaner. Follow
the directions and cautions supplied with the
cleaner.
4. Straighten any bent condenser fins with a fin comb.
5. Carefully wipe off the fan blades and motor with a soft
cloth. Do not bend the fan blades. If the fan blades are
excessively dirty, wash with warm, soapy water and
rinse thoroughly.
WATER-COOLED CONDENSER AND WATER
REGULATING VALVE
The water-cooled condenser and water regulating valve may
require cleaning due to scale build-up.
Low ice production, high water consumption and high
operating temperatures and pressures all may be symptoms
of restrictions in the condenser water circuit.
Because the cleaning procedures require special pumps and
cleaning solutions, they must be performed by qualified
maintenance or service personnel.
44
Part Number 80-01111-9 7/10
QM45/Q130/Q170/Q210/Q270
INTERIOR CLEANING AND SANITIZING
General
Clean and sanitize the ice machine every six months
for efficient operation. If the ice machine requires more
frequent cleaning and sanitizing, consult a qualified
service company to test the water quality and
recommend appropriate water treatment.
The ice machine must be taken apart for cleaning and
sanitizing.
! Caution
Use only Ma nitowoc app roved Ice Machine
Cleaner (p art number 94-0 546-3) and
Sanitizer (p art n umber 94 -0565-3). It is a
violation of F ederal law to u
se th ese
solutions in a manner inconsistent with their
labeling. Read and unde rstand all lab els
printed on bottles before use.
Cleaning and Sanitizing Procedure
! Caution
Do no t mix Ice Machi
ne Cle aner an d
Sanitizer solutions together. It is a violation of
Federal l aw to u se the se solutions i n a
manner inconsistent with their labeling.
! Warning
Wear rubb er glo ves and safe ty g oggles
(and/or face sh ield) when h andling Ice
Machine Cleaner or Sanitizer.
Ice machine cleaner is used to remove lime scale and
mineral deposits. Ice machine sanitizer disinfects and
removes algae and slime.
Part Number 80-01111-9 7/10
45
Step 1 Set the toggle switch to the OFF position after
ice falls from the evaporator at the end of a Harvest
cycle. Or, set the switch to the OFF position and allow
the ice to melt off the evaporator.
! Caution
Never use a nything to force ice fro m the
evaporator. Damage may result.
Step 2 Remove all ice from the bin.
Step 3 To start a cleaning cycle, move the toggle
switch to the WASH position.
Step 4 Add the proper amount of Manitowoc Ice
Machine Cleaner to the water trough.
Model
Amount of Cleaner
QM45
1.5 ounce (45 ml)
Q130
1 ounce (30 ml)
Q170
2 ounces (60 ml)
Q210
2 ounces (60 ml)
Q270
2 ounces (60 ml)
Step 5 Wait until the clean cycle is complete
(approximately 22 minutes) then place the toggle
switch in the OFF position, disconnect power and
water supplies to the ice machine.
! Warning
Disconnect electric power to the ice machine
at the electric switch box before proceeding.
46
Part Number 80-01111-9 7/10
Step 6 Remove parts for cleaning.
A. Remove Two Thumbscrews and Water
Pump Cover (When Used).
B. Remove the Vinyl Hose Connecting the
Water Pump and Water Distribution Tube
C. Remove Water Pump
•
Disconnect the water pump power cord
•
Loosen the screws securing the pumpmounting bracket to the bulkhead
•
Lift the pump and bracket assembly off
the mounting screws.
WHEN USED- REMOVE
THUMBSCREWS AND
WATER PUMP COVER
DO NOT SOAK
WATER PUMP MOTOR IN
CLEANER OR SANITIZER
SOLUTIONS
Water Pump Removal
Part Number 80-01111-9 7/10
47
•
D. Remove the Ice Thickness Probe
Compress the side of the ice thickness probe
near the top hinge pin and remove it from the
bracket.
ICE
THICKNESS
PROBE
COMPRESS SIDES OF ICE
THICKNESS PROBE
SV1138A
Ice Thickness Probe Removal
NOTE: At this point, the ice thickness probe can easily
be cleaned. If complete removal is desired follow the
ice thickness probe wire to the bulkhead grommet (exit
point) in the back wall. Pop the bulkhead grommet out
of the back wall by inserting fingernails or a flat object
between the back wall and the grommet and prying
forward. Pull the bulkhead grommet and wire forward
until the connector is accessible, then disconnect the
wire lead from the connector.
Ice Thickness Probe Cleaning
• Mix a solution of Manitowoc ice machine cleaner
and water (2 ounces of cleaner to 16 ounces of
water) in a container.
• Soak the ice thickness probe a minimum of 10
minutes.
Clean all ice thickness probe surfaces and verify the
ice thickness probe cavity is clean. Rinse thoroughly
with clean water, then dry completely. Incomplete
rinsing and drying of the ice thickness probe can
cause premature harvest.
48
Part Number 80-01111-9 7/10
E. Remove the Water Distribution Tube
Q170/Q210/Q270 Models
1. LIFT UP
2. SLIDE BACK
3. SLIDE TO RIGHT
2
3
1
DISTRIBUTION
TUBE
THUMB
SCREW
THUMB
SCREW
SV1630
Q170/Q210/Q270
Water Distribution Tube Removal
•
•
Loosen the two thumbscrews, which secure the
distribution tube.
Lift the right side of the distribution tube up off the
locating pin, then slide it back and to the right.
! Caution
Do not force this removal. Be
sure the
locating pin is clear of the hole before sliding
the distribution tube out.
Part Number 80-01111-9 7/10
49
Disassembly
• Twist both of the inner tube ends until the tabs line
up with the keyways.
• Pull the inner tube ends outward.
INNER
TUBE
INNER
TUBE
TAB
KEYWAY
SV1211
Q210/Q270 Water Distribution Tube Disassembly
50
Part Number 80-01111-9 7/10
Q130 Models
DISTRIBUTION
TUBE
THUMBSCREW
THUMBSCREW
REMOVE ICE
THICKNESS PROBE
SV1731C
Q130 Water Distribution Tube Removal
•
Loosen the two thumbscrews, which secure
the distribution tube.
• Lift the distribution tube up off the
thumbscrews.
Disassembly
• Twist the barbed end until the tab lines up with
the keyway.
• Pull the inner tube end outward.
TAB
KEYWAY
SV1741
Q130 Water Distribution Tube Disassembly
Part Number 80-01111-9 7/10
51
F. Remove the Float Valve
•
Turn the splash shield counterclockwise one or
two turns.
FLOAT VALVE
BRACKET
COMPRESSION
FITTING
SHUT-OFF
VALVE
CAP AND FILTER
SCREEN
SPLASH
SHIELD
FLOAT
SV1695-2
FLOAT VALVE REMOVAL
•
•
•
52
Pull the float valve forward and off the mounting
bracket.
Disconnect the water inlet tube from the float valve
at the compression fitting.
Remove the cap and filter screen for cleaning.
Part Number 80-01111-9 7/10
G. Remove the Water Trough
•
•
•
•
Apply downward pressure on the siphon tube and
remove from the bottom of the water trough.
Remove the upper thumbscrew.
While supporting the water trough remove the two
thumbscrews from beneath the water trough.
Remove the water trough from the bin area.
UPPER
THUMBSCREW
SV1689-1
LOWER
THUMBSCREWS
REMOVE
SIPHON
TUBE
SV1689-2
Part Number 80-01111-9 7/10
53
H. Remove the ice damper.
Q130
•
Grasp left side of ice damper and apply
pressure against the right-hand ice damper
mounting bracket.
•
Pull forward on the ice damper until the lefthand mounting pin disengages.
STEP 1
STEP 2
SV1731F
Installation
•
Grasp the right side of ice damper and place
left hand pin in the mounting bracket.
•
While applying pressure against the left-hand
mounting bracket push the damper until the
right-hand mounting pin engages.
STEP 1
STEP 2
SV1731G
Q170/Q210/Q270
54
Part Number 80-01111-9 7/10
•
Grasp ice damper and apply pressure toward
the left hand mounting bracket.
•
Apply pressure to the right hand mounting
bracket with thumb.
•
Pull ice damper forward when the right hand
ice damper pin disengages.
STEP 3
STEP 2
STEP 1
SV1742A
Installation
•
Place ice damper pin in left hand mounting
bracket and apply pressure toward the left
hand mounting bracket.
•
Apply pressure to the right hand mounting
bracket with thumb.
•
Push ice damper toward evaporator until right
hand damper pin engages.
STEP 2
STEP 3
STEP 1
Part Number 80-01111-9 7/10
SV1742H
55
I. Remove the Bin Door
•
•
•
•
•
•
Grasp the rear of the bin door and pull bin door
forward approximately 5".
Slide bin door to the rear while applying upward
pressure (The rear door pins will ride up into the track
slot and slide backward to the stop tab).
While applying pressure against the bin door pull
down on the rear of each bin door track until the door
pins clear the stop tabs.
Slide the rear door pins off the end and then below
the door track. Slide bin door forward allowing the
back of the door to lower into the bin. Continue
forward with the bin door until the front pins bottom
out in the track.
Lift right side of door until the front pins clear the
track, then remove door from bin.
Remove rollers (4) from all door pins.
STOP TAB
TRACK SLOT
SLIDE DOOR
FORWARD
SV1748
56
Part Number 80-01111-9 7/10
Step 7 Mix a solution of cleaner and warm water.
Depending on the amount of mineral buildup, a larger
quantity of solution may be required. Use the ratio in
the table below to mix enough solution to thoroughly
clean all parts.
Solution
Type
Water
Mixed with
Cleaner
1 gal. (4 l)
16 oz (500 ml) cleaner
Step 8 Use ½ of the cleaner/water solution to clean
all components. The cleaner solution will foam when it
contacts lime scale and mineral deposits; once the
foaming stops use a soft bristle brush, sponge or cloth
(not a wire brush) to carefully clean the parts. Soak the
parts for 5 minutes (15 – 20 minutes for heavily scaled
parts). Rinse all components with clean water.
Step 9 While components are soaking, use ½ of the
cleaner/water solution to clean all foodzone surfaces
of the ice machine and bin. Use a nylon brush or cloth
to thoroughly clean the following ice machine areas:
• Evaporator plastic parts – including top, bottom
and sides
• Bin bottom, sides and top
Rinse all areas thoroughly with clean water.
Step 10 Mix a solution of sanitizer and warm water.
Solution
Type
Water
Mixed With
Sanitizer
6 gal. (23 l)
4 oz (120 ml) sanitizer
Step 11 Use 1/2 of the sanitizer/water solution to
sanitize all removed components. Use a cloth or
sponge to liberally apply the solution to all surfaces of
the removed parts or soak the removed parts in the
sanitizer/water solution. Do not rinse parts after
sanitizing.
Part Number 80-01111-9 7/10
57
Step 12 Use 1/2 of the sanitizer/water solution to
sanitize all foodzone surfaces of the ice machine and
bin. Use a cloth or sponge to liberally apply the
solution. When sanitizing, pay particular attention to
the following areas:
• Evaporator plastic parts - including top, bottom and
sides
• Bin bottom, sides and top
Do not rinse the sanitized areas.
Step 13 Replace all removed components.
Step 14 Reapply power and water to the ice machine
and place the toggle switch in the WASH position.
Add the proper amount of Manitowoc Ice Machine
Sanitizer to the water trough.
Model
Amount of Sanitizer
QM45
1.5 ounces (45 ml)
Q130
1.6 ounces (48 ml)
Q170
2.2 ounces (66 ml)
Q210
2.2 ounces (66 ml)
Q270
1.9 ounces (57 ml)
Step 15 Wait until the sanitize cycle is complete
(approximately 22 minutes) then place the toggle
switch in the OFF position, disconnect power and
water supplies to the ice machine.
! Warning
Disconnect el ectric po wer to
the i ce
machine at th e electric sw itch box before
proceeding.
Step 16 Repeat step 6 to remove parts for hand
sanitizing.
Step 17 Mix a solution of sanitizer and warm water.
58
Solution
Type
Water
Mixed With
Sanitizer
6 gal. (23 l)
4 oz (120 ml) sanitizer
Part Number 80-01111-9 7/10
Step 18 Use 1/2 of the sanitizer/water solution to
sanitize all removed components. Use a cloth or
sponge to liberally apply the solution to all surfaces of
the removed parts or soak the removed parts in the
sanitizer/water solution. Do not rinse parts after
sanitizing.
Step 19 Use 1/2 of the sanitizer/water solution to
sanitize all foodzone surfaces of the ice machine and
bin. Use a cloth or sponge to liberally apply the
solution. When sanitizing, pay particular attention to
the following areas:
• Evaporator plastic parts - including top, bottom and
sides
• Bin bottom, sides and top
Do not rinse the sanitized areas.
Step 20 Replace all removed components.
Step 21 Reapply power and water to the ice machine
and place the toggle switch in the ICE position.
Part Number 80-01111-9 7/10
59
QM20/QM30
CLEANING AND SANITIZING PROCEDURE
! Caution
Use only Ma nitowoc app roved Ice Machine
Cleaner (p art number 94-0 546-3) and
Sanitizer (p art n umber 94 -0565-3). It is a
violation of F ederal law to use
th ese
solutions in a manner inconsistent with their
labeling. Read and unde rstand all lab els
printed on bottles before use.
! Caution
Do n ot mix Ice Machi
ne Cleaner an d
Sanitizer solutions toge ther. It is a violation
of Federal law to use th ese solu tions in a
manner inconsistent with their labeling.
! Warning
Wear rubb er glove s a nd safety goggles
(and/or face shie ld) w hen handling Ice
Machine Cleaner or Sanitizer.
Ice machine cleaner is used to remove lime scale and
mineral deposits. Ice machine sanitizer disinfects and
removes algae and slime.
60
Part Number 80-01111-9 7/10
Step 1 Set the toggle switch to the OFF position after
ice falls from the evaporator at the end of a Harvest
cycle. Or, set the switch to the OFF position and allow
the ice to melt off the evaporator.
! Caution
Never use anything to force ice
evaporator. Damage may result.
from th e
Step 2 Remove all ice from the bin.
Step 3 To start a cleaning cycle, move the toggle
switch to the WASH position.
Step 4 Wait until water flows over the evaporator
(about three minutes) then add the proper amount of
Manitowoc Ice Machine Cleaner to the water trough.
Model
Amount of Cleaner
QM20/QM30
45 ml
Step 5 Wait until the clean cycle is complete
(approximately 45 minutes) then place the toggle
switch in the OFF position, disconnect power and
water supplies to the ice machine.
! Warning
Disconnect electric power to the ice machine
at the electric switch box before proceeding.
Part Number 80-01111-9 7/10
61
Step 6 Remove parts for cleaning.
A. Remove the Overflow Tube
• To remove the tube, lift it up while using a slight
back and forth motion to loosen it from the drain
hole.
When installing the tube, be sure it is completely
inserted into the drain hole to prevent water leakage
during normal operation.
DRAIN
HOLE
OVERFLOW
TUBE
Removing the Overflow Tube
•
62
B. Remove the Vinyl Hose
Disconnect the water pump discharge hose from
the distribution tube and water pump.
Part Number 80-01111-9 7/10
•
•
•
C. Remove the Water Pump
Disconnect the water pump power cord.
Loosen the screws that hold the water pump in
place.
Lift the water pump and bracket assembly up and
off the screws.
SCREWS
WATER
PUMP
Removing the Water Pump
•
D. Remove the Water Trough
Remove the screws holding the water trough to the
walls of the cabinet.
REMOVE SCREWS
SV3019
Part Number 80-01111-9 7/10
63
Step 7 Mix a solution of cleaner and warm water.
Depending on the amount of mineral buildup, a larger
quantity of solution may be required. Use the ratio in
the table below to mix enough solution to thoroughly
clean all parts.
Solution Type
Cleaner
Water
Mixed with
4L. (1 gal)
500 ml (16 oz)
cleaner
Step 8 Use half of the cleaner/water solution to clean
all components. The cleaner solution will foam when it
contacts lime scale and mineral deposits; once the
foaming stops use a soft bristle brush, sponge or cloth
(not a wire brush) to carefully clean the parts. Soak the
parts for 5 minutes (15 – 20 minutes for heavily scaled
parts). Rinse all components with clean water.
Step 9 While components are soaking, use half of the
cleaner/water solution to clean all foodzone surfaces
of the ice machine and bin. Use a nylon brush or cloth
to thoroughly clean the following ice machine areas:
• Evaporator plastic parts – including top, bottom
and sides
• Bin bottom, sides and top
Rinse all areas thoroughly with clean water.
Step 10 Mix a solution of sanitizer and warm water.
Solution
Type
Water
Mixed With
Sanitizer
23 L. (6 gal )
120 ml
(4 ounces) sanitizer
Step 11 Use half of the sanitizer/water solution to
sanitize all removed components. Use a cloth or
sponge to liberally apply the solution to all surfaces of
the removed parts or soak the removed parts in the
sanitizer/water solution. Do not rinse parts after
sanitizing.
64
Part Number 80-01111-9 7/10
Step 12 Use half of the sanitizer/water solution to
sanitize all foodzone surfaces of the ice machine and
bin. Use a cloth or sponge to liberally apply the
solution. When sanitizing, pay particular attention to
the following areas:
• Evaporator plastic parts - including top, bottom and
sides
• Bin bottom, sides and top
Do not rinse the sanitized areas.
Step 13 Replace all removed components.
Step 14 Reapply power and water to the ice machine
and place the toggle switch in the WASH position.
Step 15 Add the proper amount of Manitowoc Ice
Machine Sanitizer to the water trough.
Model
Amount of Sanitizer
QM20/QM30
45 ml
Step 16 Wait until the sanitize cycle is complete
(approximately 45 minutes) then place the toggle
switch in the OFF position, disconnect power and
water supplies to the ice machine.
! Warning
Disconnect electric power to the ice machine
at the electric switch box before proceeding.
Step 17 Repeat step 6 to remove parts for hand
sanitizing.
Step 18 Mix a solution of sanitizer and warm water.
Solution Type
Sanitizer
Water
Mixed With
23L. (6 gal )
120 ml (4 oz)
sanitizer
Step 19 Use half of the sanitizer/water solution to
sanitize all removed components. Use a cloth or
sponge to liberally apply the solution to all surfaces of
the removed parts or soak the removed parts in the
sanitizer/water solution. Do not rinse parts after
sanitizing.
Part Number 80-01111-9 7/10
65
Step 20 Use half of the sanitizer/water solution to
sanitize all foodzone surfaces of the ice machine and
bin. Use a cloth or sponge to liberally apply the
solution. When sanitizing, pay particular attention to
the following areas:
• Evaporator plastic parts - including top, bottom and
sides
• Bin bottom, sides and top
Do not rinse the sanitized areas.
Step 21 Replace all removed components.
Step 22 Reapply power and water to the ice machine
and place the toggle switch in the ICE position.
66
Part Number 80-01111-9 7/10
SM50
CLEANING PROCEDURE
SM50 uses a tin plated evaporator. Do not use
standard cleaner, use only 000000084 cleaner for this
ice machine.
! Caution
Use onl y Manitowoc app roved Ice Ma chine
Cleaner (part number 94-0546-3 original green ice
machine cl eaner or 000000084 cl ear met al safe
ice mach ine cleaner) and Sani tizer (p art nu mber
94-0565-3). It is a viola tion of Fed eral law to use
these solutions in a manner inconsistent with their
labeling. Re ad and u nderstand a ll labels printed
on bottles before use.
Ice machine cleaner is used to remove lime scale or
other mineral deposits. It is not used to remove algae
or slime. Refer to “Sanitizing Procedure” on page 68
for removal of algae and slime.
1. To start a cleaning cycle, press the CLEAN
switch. The ice machine will initiate a 2 minute
harvest to remove any ice from the evaporator.
Or, set the switch to the OFF position and allow
the ice to melt off the evaporator.
! Caution
Never use a nything to force i
evaporator. Damage may result.
ce from the
2. Remove all ice from the bin.
3. The clean light will energize to indicate the clean
cycle has started.
Part Number 80-01111-9 7/10
67
4. Wait until the Clean light flashes (3 minutes) then
add 3 oz of Manitowoc cleaner by lifting the water
shutter and pouring directly into the spray area.
The ice machine will automatically time out a ten
minute cleaning cycle, followed by eight rinse
cycles, and stop. The Clean light will turn off to
indicate the Clean cycle is complete. This entire
cycle lasts approximately 30 minutes.
5. When the cleaning process stops, remove all
parts as described in Removal of Parts for
Cleaning and Sanitizing.
6. Mix 16 oz (480 ml) cleaner with 1 gal (4 L) of
warm water in a non metallic container.7. Take all components to sink for cleaning. Use 1/2
of the Cleaner/Water mixture and clean all
components with a soft nylon brush or cloth.
Disassemble spray bar, remove nozzles and
inserts and soak for 5 minutes. For heavily scaled
parts, soak in solution for 15 – 20 minutes. Rinse
all components with clean water.
8. While components are soaking, use nylon brush
or cloth to clean inside of ice bin. Clean inside of
door, door gasket, bin, top of evaporator and
evaporator bucket. Rinse all areas thoroughly with
clean water.
SANITIZING PROCEDURE
Use sanitizer to remove algae or slime. Do not use it to
remove lime scale or other mineral deposits.
NOTE: Always perform a cleaning procedure before
sanitizing the ice machine.
1. Mix 4 oz (120 ml) sanitizer with 6 gal (13 L) of
warm water in a non metallic container.
2. Take all components to sink for sanitizing. Use the
Sanitizer/Water mixture and sanitize all
components that were removed for the Cleaning
Procedure with a soft nylon brush or cloth. Soak
for 5 minutes. Do not rinse sanitized components.
68
Part Number 80-01111-9 7/10
3. While components are soaking, use nylon brush
or cloth to sanitize the inside of ice bin. Sanitize
inside of door, door gasket, bin, top of evaporator
and evaporator bucket. Do not rinse sanitized
components.
4. Replace all components removed.
5. To start a sanitizing cycle, press the CLEAN
switch. The Clean light will energize to indicate
the sanitizing cycle has started.
6. Wait until the Clean light flashes (3 minutes) then
add 0.5 oz (15 ml) of Manitowoc sanitizer by lifting
the water shutter and pouring directly into the
spray area. The ice machine will automatically
time out a ten minute cleaning cycle, followed by
eight rinse cycles, and stop. The Clean light will
turn off to indicate the Cleaning cycle is
completed. This entire cycle lasts approximately
30 minutes.
NOTE: The ice machine will automatically continue from the
previous point before the clean cycle was initiated.
•
If the ice machine was in the ice making cycle, the
control board will initiate a 2 minute harvest cycle,
perform the clean cycle and start ice making again
automatically.
•
If the ice machine was in the off cycle, the control board
will perform a clean cycle and turn off automatically.
•
If the ice machine was in a delay mode, the control board
will perform a clean cycle and resume the delay period
automatically.
REMOVAL OF PARTS FOR CLEANING AND
SANITIZING
1. Disconnect power to the ice machine at the
electric switch box.
2. Turn off the water supply to the ice machine at the
water service valve.
! Warning
Disconnect el ectric po wer to the ice machine at
the electric switch box before proceeding.
3. Remove the parts or components you want to
clean or sanitize:
Part Number 80-01111-9 7/10
69
WATER SHUTTERS
The water shutter is designed to keep the spraying
water from escaping the evaporator compartment.
To remove just the water shutters:
1. Grasp one end of the water shutter and lift up.
2. Pivot water shutter and disengage remaining end.
3. To re-install into ice machine, grasp one end of
the water shutters, install one end, pivot the
opposite end and pull down into position. Make
sure tabs are secure in grooves.
To remove water shutter assembly:
1. Slide evaporator bucket forward 1/2" (13 mm).
2. Lift shutter assembly straight up.
GRASP
WATER
SHUTTERS
HERE
SHUTTER
ASSEMBLY
WATER
SHUTTERS
! Warning
Removing the water shu tters whil e the water
pump is running will allow water to spray from ice
machine. D isconnect the e lectrical p ower to the
ice machine at the electric service switch box and
turn off the water supply.
70
Part Number 80-01111-9 7/10
ICE CHUTE
The ice chute is positioned over the spray nozzles and
allows the ice to easily fall into the bin. It must be firmly
positioned over the spray bar, with the front edge
inside the water trough. Spray nozzles must align with
the spray holes or spray water will fall into the bin.
1. Grab protruding spray hole on one end and lift up
and remove.
2. To re-install ice chute, grasp protruding spray hole
and position over Water Distribution Assembly.
Make sure rear supports are over spray bar, and
front edge is inside of water trough.
Part Number 80-01111-9 7/10
71
SUMP DRAIN OVERFLOW TUBE
1. Remove clamp.
2. Pull down to remove overflow tube and tubing as
an assembly. The sump trough water will drain
into the bin.
3. Remove overflow tube from vinyl tubing by
pulling.
REMOVE CLAMP
AND
PULL DOWN
72
Part Number 80-01111-9 7/10
WATER TROUGH
1. Depress tabs on right and left side of the water
trough.
2. Allow front of water trough to drop as you pull
forward to disengage the rear pins.
Part Number 80-01111-9 7/10
73
SPRAY BAR, WATER PUMP AND HOSE
! Warning
Disconnect the e lectric power to the ice machine
at the electric service switch b ox and turn off the
water supply before proceeding.
Remove spray bar clamp and spray bar.
1. Grasp pump and pull straight down until water
pump disengages and electrical connector is
visible.
2. Disconnect the electrical connector.
3. Remove the water pump from ice machine.
4. Remove clamp from hose to remove from pump.
5. Do not submerse the water pumpmotor in cleaner
or sanitizer. If soaking is required, immerse pump
to normal water level during the freeze.
REMOVE
CLAMP
DO NOT
IMMERSE
MOTOR IN
SOLUTION
MAXIMUM
SOLUTION
HEIGHT WHEN
SOAKING
REMOVE
CLAMP
74
Part Number 80-01111-9 7/10
SPRAY BAR DISASSEMBLY
The spray bar supplies water to the individual ice
making cups. Water from the water pump sprays
through the nozzles, located on the upper portion of
the tubes.
1. Grasp one end of the spray bar, lift up and remove
from seat formed in evaporator bucket.
2. Remove clamp on water inlet tubing by grasping
both ears on clip and separating.
3. Apply food grade lubricant to ease re-assembly of
spray bar components when necessary.
4. To re-install spray bar, position water inlet tubing
on inlet ports, and squeeze clips until tight.
5. Reposition assembly on water trough seat.
Nozzles and inserts can be removed for cleaning
by unscrewing nozzles. Inserts are located inside
the spray bar ports. The spray bar also
disassembles for easy cleaning.
REMOVE
CLAMP
Part Number 80-01111-9 7/10
75
! Warning
Wear ru bber gloves an d sa fety g oggles (and/or
face shie ld) whe n han dling Ice Ma chine Clea ner
or Sanitizer.
6. Soak the removed part(s) in a properly mixed
solution.
Solution
Type
Water
Mixed With
Cleaner
1 gal (4 l)
16 oz (500 ml)
cleaner
Sanitizer
6 gal (23 l)
4 oz (120 ml)
sanitizer
7. Use a soft-bristle brush or sponge (NOT a wire
brush) to carefully clean the parts.
! Warning
Do not mi x Cleaner and Sanitizer solu tions
together. It is a viola tion of Fe deral law to use
these solutions in a manner inconsistent with their
labeling.
! Caution
Do not immerse the water pum p motor in the
cleaning or sanitizing solution.
8. Use the solution and a brush to clean the top,
sides, and bottom evaporator extrusions; the
inside of the ice machine panels; and the entire
inside of the bin.
NOTE: Do not rinse sanitized components.
9. Install the removed parts.
10. Turn on the water and electrical supply.
76
Part Number 80-01111-9 7/10
Removal from Service/Winterization
GENERAL
Special precautions must be taken if the ice machine is
to be removed from service for an extended period of
time or exposed to ambient temperatures of 32°F
(0°C) or below.
! Caution
If water is allowed to remain in the ice machine in
freezing temperatures, severe damag e to some
components could result. Damage of this nature is
not covered by the warranty.
Follow the applicable procedure below.
SELF-CONTAINED AIR-COOLED ICE MACHINES
1. Disconnect the electric power at the circuit
breaker or the electric service switch.
2. Turn off the water supply.
3. Remove the water from the water trough.
4. Disconnect and drain the incoming ice-making
water line at the rear of the ice machine.
5. Blow compressed air in both the incoming water
and the drain openings in the rear of the ice
machine until no more water comes out of the
inlet water lines or the drain.
6. Make sure water is not trapped in any of the water
lines, drain lines, distribution tubes, etc.
Part Number 80-01111-9 7/10
77
WATER-COOLED ICE MACHINES
1. Perform steps 1-6 under “Self-contained Aircooled Ice Machines” on page 77.
2. Disconnect the incoming water and drain lines
from the water-cooled condenser.
3. Insert a large screwdriver between the bottom
spring coils of the water regulating valve. Pry
upward to open the valve.
SV1624
Pry Open the Water Regulating Valve
4. Hold the valve open and blow compressed air
through the condenser until no water remains.
78
Part Number 80-01111-9 7/10
Operation
QM45/Q130/Q170/Q210/Q270
INITIAL START-UP OR START-UP AFTER
AUTOMATIC SHUT-OFF
1. Pressure Equalization
Before the compressor starts the hot gas valve is
energized for 15 seconds to equalize pressures during
the initial refrigeration system start-up.
2. Refrigeration System Start-up
The compressor starts after the 15-second pressure
equalization, and remains on throughout the entire
Freeze and Harvest Sequences. The hot gas valve
remains on for 5 seconds during initial compressor
start-up and then shuts off.
At the same time the compressor starts, the
condenser fan motor (air-cooled models) is supplied
with power throughout the entire Freeze and Harvest
Sequences. The fan motor is wired through a fan cycle
pressure control, therefore it may cycle on and off.
(The compressor and condenser fan motor are wired
through the relay. As a result, any time the relay coil is
energized, the compressor and fan motor are supplied
with power.)
FREEZE SEQUENCE
3. Prechill
The compressor is on for 30 seconds prior to water
flow to prechill the evaporator.
4. Freeze
The water pump starts after the 30-second prechill. An
even flow of water is directed across the evaporator
and into each cube cell, where it freezes.
When sufficient ice has formed, the water flow (not the
ice) contacts the ice thickness probe. After
approximately 7 seconds of continual water contact,
the Harvest Sequence is initiated. The ice machine
cannot initiate a Harvest Sequence until a 6-minute
freeze time has been surpassed.
Part Number 80-01111-9 7/10
79
HARVEST SEQUENCE
5. Harvest
The water pump de-energizes stopping flow over the
evaporator. The rising level of water in the sump
trough diverts water out of the overflow tube, purging
excess minerals from the sump trough. The hot gas
valve also opens to divert hot refrigerant gas into the
evaporator.
The refrigerant gas warms the evaporator causing the
cubes to slide, as a sheet, off the evaporator and into
the storage bin. The sliding sheet of cubes contacts
the ice damper, opening the bin switch.
The momentary opening and re-closing of the bin
switch terminates the Harvest Sequence and returns
the ice machine to the Freeze Sequence (steps 3 - 4).
AUTOMATIC SHUT-OFF
6. Automatic Shut-off
When the storage bin is full at the end of a harvest
sequence, the sheet of cubes fails to clear the ice
damper and will hold it down. After the ice damper is
held open for 7 seconds, the ice machine shuts off.
The ice machine remains off for 3 minutes before it
can automatically restart.
The ice machine remains off until enough ice has been
removed from the storage bin to allow the ice to fall
clear of the damper. As the ice damper swings back to
the operating position, the bin switch re-closes and the
ice machine restarts (steps 1 - 2), provided the
3 minute delay period is complete.
80
Part Number 80-01111-9 7/10
Part Number 80-01111-9 7/10
4. Freeze
3. Pre chill
Freeze Sequence
2. Refrigeration
System Start-up
1. Water purge
Initial Start-up
ICE MAKING
SEQUENCE OF
OPERATION
off
off
on
on
off
off
on
Hot Gas Valve
Water Pump
off
2
1
3
on
on
on
off
Relay
Coil
Control Board Relays
on
on
on
off
Compressor
3A
3B
on
on
on
off
Compressor
Fan Motor*
Relay
Until 7 sec.
Water contact
w/ice
thickness
probe
30 seconds
5 seconds
15 seconds
Length of
Time
ENERGIZED PARTS CHART
Q130/Q170/Q210/Q270/QM45
Self-Contained Ice Machines
* Condenser Fan Motor: The fan motor is wired through a fan cycle
pressure control; therefore, it may cycle on and off.
81
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Part Number 80-01111-9 7/10
6. Auto Shut-off
Automatic
Shut-off
5. Harvest
Harvest
Sequence
ICE MAKING
SEQUENCE OF
OPERATION
off
off
Water Pump
1
off
off
on
Relay
Coil
Hot Gas
Valve
on
3
2
Control Board Relays
off
on
Compressor
3A
3B
off
on
Condenser
Fan Motor*
Relay
Until bin
switch
re-closes
Bin switch
activation
Length of
Time
QM20/QM30
INITIAL START-UP OR START-UP AFTER
AUTOMATIC SHUT-OFF
1. Water Purge
The water fill valve and the hot gas valve are
energized for 2.9 minutes (175 seconds). This ensures
that the ice making cycle starts with fresh water, and
that the refrigerant pressures are equalized prior to
refrigeration system start-up.
2. Refrigeration System Start-up
The compressor starts 2.9 minutes (175 seconds)
after the water fill valve and hot gas valve are
energized. (The water fill valve and hot gas valve
remain energized for 5 seconds during compressor
start-up, and then shut off.) The compressor remains
on throughout the entire freeze and harvest cycles.
FREEZE SEQUENCE
3. Freeze Cycle
The condenser fan motor and water pump are
energized and remain on throughout the entire freeze
cycle. An even flow of water is directed across the
evaporator and into each cube cell, where it freezes.
The control system automatically determines the
length of the freeze cycle by monitoring the
temperature of the refrigeration system liquid line.
Part Number 80-01111-9 7/10
83
HARVEST SEQUENCE
4. Harvest Cycle
The condenser fan motor and water pump deenergize. The water fill valve energizes to purge the
water in the water trough. The hot gas valve also
energizes at the beginning of the harvest cycle to
divert hot refrigerant gas into the evaporator. The hot
refrigerant gas warms the evaporator, causing the
cubes to slide, as a sheet, off the evaporator and into
the ice storage bin.
The control system automatically determines the
length of the harvest cycle, based on the temperature
of the refrigeration system liquid line at the end of the
freeze cycle. At the end of the harvest cycle, the ice
machine returns to another freeze cycle (step 3).
AUTOMATIC SHUT-OFF
5. Automatic Shut-off
The level of ice in the ice storage bin controls the ice
machine shut-off. When the bin is full, ice cubes
contact the bin thermostat bulb holder, which cools
down and opens to stop the ice machine. The ice
machine remains off until enough ice has been
removed from the bin. This causes the thermostat bulb
holder to warm and close, restarting the ice machine.
When the ice machine restarts, it returns to the startup sequence (steps 1 – 2).
84
Part Number 80-01111-9 7/10
on
off
on
off
on
on
off
3. Freeze Cycle
4. Harvest Cycle
5. Auto-shut-off
on
Part Number 80-01111-9 7/10
off
off
on
off
off
3
Water Pump
Fan Motor
2
Hot Gas Valve
Water Fill Valve
on
off
Compressor
1
Control Board Relays
2. Refrigeration System
Start-up
1. Water purge
Initial Start-up
ICE MAKING
SEQUENCE OF
OPERATION
Until bin
thermostat
re-closes
Automatically
determined
Automatically
determined
5 seconds
2.9 minutes
(175 seconds)
Length of
“ON” Time
ENERGIZED PARTS CHART
QM20/QM30
Self-Contained Ice Machines
85
SM50
INITIAL START-UP OR START-UP AFTER
AUTOMATIC SHUT-OFF
Sequence of Operation
Bin thermostat and the optional drain pump safety
switch must be closed before the ice machine will
start.
1. Initial Start-up or Start-up After Automatic
Shut-off – Water Fill
Before the compressor starts, the water pump, water
inlet valve and hot gas valve are energized for about 3
minutes.
2. Refrigeration System Start-up
The compressor starts after the water fill, and remains
on throughout the Freeze and Harvest cycles. The hot
gas valve remains on for 5 seconds during initial
compressor start-up and then shuts off.
At the same time the compressor starts, the
condenser fan motor (air-cooled models) is supplied
with power. The condenser fan motor will remain
energized during the entire freeze cycle.
3. Freeze
The water pump sprays water into the inverted cups.
The water freezes layer by layer, until an ice cube
forms in each cup. The control system monitors the
temperature of the refrigeration system liquid line to
determine the length of the freeze cycle.
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Part Number 80-01111-9 7/10
4.
Harvest
The water pump de-energizes and the water inlet
valve energizes to assist harvest and refill the water
sump. The hot gas valve opens and the refrigerant gas
warms the evaporator allowing the cubes to release
from the evaporator and drop into the storage bin.
The control system automatically determines:
• Length of time the ice machine will remain in the
harvest cycle
• Whether the condenser fan motor is energized or
de-energized during the harvest cycle
At the end of the harvest cycle the ice machine will
start another freeze cycle (step 3).
5. Automatic Shut-off
The level of ice in the ice storage bin controls the ice
machine shut-off. When the bin is full, ice cubes
contact the bin thermostat bulb holder, which cools
down and opens to stop the ice machine. The ice
machine remains off until enough ice has been
removed from the bin. This causes the thermostat bulb
holder to warm and close, restarting the ice machine.
When the ice machine restarts, it returns to the startup sequence (steps 1 – 2).
Part Number 80-01111-9 7/10
87
88
on
off
off
off
Harvest
Automatic Shutoff
on
off
on
Refrigeration
System Start-up
on
on
on
Initial Start-up/
Start-up after
Automatic Shutoff
Water
Inlet
Valve
(2)
Freeze Cycle
Water
Pump
(1)
SEQUENCE
(Relay)
off
on
off
on
on
Harvest
Valve
(3)
off
on
on
on
off
Compressor
(4)
Until bin
thermostat
Re-closes
Automatically
determined*
on
or
off
off
Automatically
determined*
5 seconds
175 seconds
Duration
on
on
off
Fan
Motor
(5)
ENERGIZED PARTS CHART
SM50
Self-contained Ice Machines
* Liquid line thermistor determines the length of the freeze and
harvest cycles. Liquid line temperature also determines fan motor
operation during the harvest cycle.
Part Number 80-01111-9 7/10
Operational Checks
QM45/Q130/Q170/Q210/Q270
Siphon System
To reduce mineral build-up and cleaning frequency,
the water in the sump trough must be purged during
each harvest cycle.
When the water pump de-energizes the level in the
water trough rises above the standpipe starting a
siphon action. The siphon action stops when the water
level in the sump trough drops. When the siphon
action stops, the float valve refills the water trough to
the correct level.
Follow steps 1 through 6 under water level check to
verify the siphon system functions correctly
Water Level
Check the water level while the ice machine is in the
ice mode and the water pump is running. The correct
water level is 1/4" (6.3 mm) to 3/8" (9.5 mm) below the
top of the standpipe, a line in the water trough
indicates the correct level.
SIPHON CAP
SET THE WATER LEVEL TO
THE LINE IN THE WATER
TROUGH
SV1689-1
Part Number 80-01111-9 7/10
89
Water Level Check
The float valve is factory-set for the proper water level.
If adjustments are necessary:
1. Verify the ice machine is level.
2. Remove the siphon cap from the standpipe.
3. Place the main ON/OFF/WASH toggle switch to
the ON position, and wait until the float valve
stops adding water.
4. Adjust the water level to [1/4" to 3/8"
(6.3 to 9.5 mm) below the standpipe] the line in
the water trough:
A. Loosen the two screws on the float valve
bracket.
B. Raise or lower the float valve assembly as
necessary, then tighten the screws.
5. Move the main ON/OFF/WASH toggle switch to
the OFF position. The water level in the trough will
rise above the standpipe and run down the drain.
6. Replace the siphon cap on the standpipe, and
verify water level and siphon action by repeating
steps 3 through 5.
Ice Thickness Check
After a harvest cycle, inspect the ice cubes in the ice
storage bin. The ice thickness probe is set to maintain
an ice bridge of 1/8" (3.2 mm). If an adjustment is
needed, follow the steps below.
1. Turn the ice thickness probe adjustment screw
clockwise for a thicker ice bridge, or
counterclockwise for a thinner ice bridge.
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Part Number 80-01111-9 7/10
ADJUSTING
SCREW
1/8" ICE BRIDGE
THICKNESS
SV3114
SV3113
Ice Thickness Adjustment
2. Make sure the ice thickness probe wire and
bracket does not restrict movement of the probe.
Part Number 80-01111-9 7/10
91
QM20/QM30
Routine adjustments and maintenance procedures
outlined in this manual are not covered by the
warranty.
Water Inlet Valve
The water inlet valve energizes in the harvest cycle.
The water level will rise and flow out the overflow tube
and down the drain. Verify the overflow tube is in place
in the water trough. The water level is not adjustable.
ATTACHMENT
POINT
OVERFLOW
TUBE
SV3019
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Part Number 80-01111-9 7/10
Ice Thickness Check
QM20/QM30 dice ice cube formation is slightly
different from our previous models. Manitowoc ice
machines have a unique cube shape. It is normal to
have a dimple in the ice cube (a concave indentation
in the cube). Ice cubes from the QM20/QM30 may
appear to have a slightly larger dimple than other
Manitowoc ice cube machines. Therefore, cube size
for the QM20/QM30 is determined by measuring the
slab weight (the combined weight of all cubes from
one harvest cycle). To determine proper slab weight
follow the instructions listed below.
ICE BRIDGE SHOULD BE
1/16 – 1/8" THICK
A DIMPLE IN EACH
CUBE CELL IS
NORMAL
SV3113
Correct Ice Bridge Thickness
1. Ensure the air filter, front, and back panels are
installed properly and close the bin door.
2. During the third harvest cycle open the bin door
and catch the entire slab of ice.
3. Weigh the ice slab. The combined weight of all
cubes from one harvest should weigh between
7 – 9 oz (200 – 270 g). If the slab weight is within
this range, the ice machine is working properly
and no further action is needed. If the slab weight
is not within this range or you desire a slightly
thicker or thinner cube, continue to step 4.
! Warning
Do not touch electrical wires. Disconnect power to
the ice machin e before makin g any ice th ickness
adjustments.
4. Remove the air filter.
Part Number 80-01111-9 7/10
93
5. Remove the two screws holding the front panel in
place and remove the front cover.
6. Locate the ice thickness control dial on the control
board (see below). Turn the dial clockwise for a
thicker cube or counterclockwise for a thinner
cube.
ICE THICKNESS
ADJUSTMENT
DIAL
DIAL IS FACTORY
SET TO ZERO
SV1710
Ice Thickness Adjustment Dial
7. Ensure all of the panels and air filter are
reinstalled properly and the bin door is closed.
Repeat steps 1 – 3.
After completing the procedure above, if you are
unable to obtain a sheet of ice weighing 7 – 9 oz
(200 – 270 g) contact the Manitowoc Service
Department for further assistance.
94
Part Number 80-01111-9 7/10
SM50
Routine adjustments and maintenance procedures
outlined in this manual are not covered by the
warranty
Water Inlet Valve
The water inlet valve energizes in the harvest cycle.
The water level will rise and flow out the overflow tube
and down the drain. Verify the overflow tube is in place
in the water trough. The water level is not adjustable.
Bin Thermostat Adjustment
The bin thermostat stops the ice machine when the bin
is full. Turn the thermostat to the left to decrease the
level of ice in bin or to the right to increase the level of
ice in bin.
Power Button (Green)
Pressing the “Power” button once will energize the ice
machine and green Power light. Pressing the “Power”
button a second time will de-energize the ice machine.
Automatic Ice Making Light (Blue)
This light is energized when the ice machine is the ice
making position. The light is off when the ice machine
is in the clean cycle.
Delay Start
Pressing the “Delay Start” button will initiate a delay
cycle. The ice machine will not run until the delay time
expires.
• Pressing the button once will energize the 2 hour
light and initiate a two hour delay period.
• Pressing the button a second time will energize the
4 hour light and initiate a four hour delay period.
• Pressing the button a third time will energize the 8
hour light and initiate an eight hour delay period.
• Pressing the button a fourth time will cancel the
delay cycle.
Part Number 80-01111-9 7/10
95
Clean (Green)
Pressing the “Clean” button will initiate a clean cycle
and de-energize the “Automatic Ice Making” light. The
clean light will flash during the clean cycle to indicate
the proper time to add ice machine cleaner or
sanitizer.
Replace Filter (Red)
When the ice machine completes 8000 freeze/harvest
cycles the light will energize to indicate the filter needs
replacement. Depressing the “Clean” button for 6
seconds will reset the counter and de-energize the
light.
Safety Timers
The control board has the following non-adjustable
safety timers:
• Initial cycle is 5 minutes longer than subsequent
cycles.
• The ice machine is locked into the freeze cycle for
10 minutes (15 minutes initial cycle) before a
harvest cycle can be initiated.
• The maximum freeze time is 120 minutes at which
time the control board automatically initiates a
harvest cycle (step 4).
• The maximum harvest time is 5 minutes at which
time the control board automatically starts a freeze
cycle.
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Part Number 80-01111-9 7/10
Cube Weight Adjustment
The cube weight can be increased from the factory
setting by adjusting the finish time.
ADDITIONAL FINISHING TIME CHECK
1. Press and hold the power button for 5 seconds.
2. Count the flashes on the Automatic Ice Making
light. The light will flash once for each additional
minute of freeze cycle time.
ADJUSTING FINISHING TIME
Adjust in 1 minute increments and allow the ice
machine to run several freeze/harvest cycles, then
inspect the ice cubes. If a heavier cube weight is
desired add another minute of freeze time and repeat
the process.
1. Press and hold the “Power” button.
2. Press and release the “Clean” button once for
each additional minute of freeze cycle time
desired.
3. Five minutes is the maximum additional freeze
time that can be added. Pressing the clean button
6 times will reset the finishing time to zero
additional minutes.
POWER
AUTOMATIC
ICE
MAKING
DELAY
START
REPLACE
WATER FILTER
CLEAN
2 4
8
HOURS
TO RESET:
PUSH AND HOLD CLEAN
BUTTON FOR 6 SECONDS
SM050 Control Panel
SM050 Ice Cube
Part Number 80-01111-9 7/10
97
This Page Intentionally Left Blank
98
Part Number 80-01111-9 7/10
Troubleshooting
QM45/Q130/Q170/Q210/Q270
DIAGNOSING AN ICE MACHINE
THAT WILL NOT RUN
! Warning
High (line) voltage is applied to the control board
(terminals # 2 a nd # 4) at a ll times. Re moving
control board fuse o r moving the tog gle switch to
OFF wi ll not remove the po wer supp lied to the
control board.
1. Verify primary voltage is supplied to ice machine
and the fuse/circuit breaker is closed.
2. Verify control board fuse is okay.
3. If the bin switch light functions, the fuse is okay.
4. Verify the bin switch functions properly. A
defective bin switch can falsely indicate a full bin
of ice.
5. Verify ON/OFF/WASH toggle switch functions
properly. A defective toggle switch may keep the
ice machine in the OFF mode.
6. Verify low DC voltage is properly grounded. Loose
DC wire connections may intermittently stop the
ice machine.
7. Replace the control board.
8. Be sure Steps 1 – 5 were followed thoroughly.
Intermittent problems are not usually related to
the control board.
Part Number 80-01111-9 7/10
99
DIAGNOSING ICE THICKNESS CONTROL
CIRCUITRY
Ice Machine Does Not Cycle Into Harvest when
Water Contacts the Ice Thickness Control Probe
Step 1 Bypass the freeze time lock-in feature by
moving the ON/OFF/WASH switch to OFF and back to
ON. Wait until the water starts to flow over the
evaporator.
Step 2 Clip the jumper wire to the ice thickness probe
and any cabinet ground.
PROBE
CONNECTION
ICE THICKNESS
PROBE
GROUND
JUMPER WIRE
EVAPORATOR
HARVEST LIGHT
(RED)
BIN SWITCH
LIGHT
(GREEN)
SV1592i
Step 2 Jumper wire connected from probe to ground
Monitoring Harvest Light
Correction
The harvest light comes on,
and 6-10 seconds later, ice
machine cycles from freeze
to harvest.
The ice thickness control
circuitry is functioning
properly. Do not change any
parts.
The harvest light comes on
but the ice machine stays in
the freeze sequence.
The ice control circuitry is
functioning properly. The ice
machine is in a six minute
freeze time lock-in. Verify
Step 1 of this procedure was
followed correctly.
The harvest light does not
come on.
Proceed to Step 3.
100
Part Number 80-01111-9 7/10
Step 3 Disconnect the ice thickness probe from the
control board terminal. Clip the jumper wire to the
terminal on the control board and any cabinet ground.
Monitor the harvest light.
ICE THICKNESS
PROBE
PROBE
CONNECTION
JUMPER WIRE
GROUND
EVAPORATOR
BIN SWITCH
HARVEST LIGHT
LIGHT
(RED)
(GREEN)
SV1592J
Step 3 Jumper wire connected from control board
terminal to ground
Monitoring Harvest Light
Correction
The harvest light comes on,
and 6-10 seconds later, ice
machine cycles from freeze
to harvest.
The ice thickness probe is
causing the malfunction.
The harvest light comes on
but the ice machine stays in
the freeze sequence.
The control circuitry is
functioning properly. The
ice machine is in a sixminute freeze time lock-in
(verify step 1 of this
procedure was followed
correctly).
The harvest light does not
come on.
The control board is
causing the malfunction.
Part Number 80-01111-9 7/10
101
Ice Machine Cycles Into Harvest Before Water
Contact with the Ice Thickness Probe
Step 1 Bypass the freeze time lock-in feature by
moving the ON/OFF/WASH switch to OFF and back to
ON. Wait until the water starts to flow over the
evaporator, then monitor the harvest light.
Step 2 Disconnect the ice thickness probe from the
control board terminal.
ICE THICKNESS
PROBE
DISCONNECT
PROBE WIRE
BIN SWITCH LIGHT
(GREEN)
HARVEST LIGHT
(RED)
SV1592J_2
Step 2 Disconnect probe from control board terminal.
Monitoring Harvest Light
Correction
The harvest light stays off
and the ice machine remains
in the freeze sequence.
The ice thickness probe is
causing the malfunction.
Verify that the Ice
Thickness probe is
adjusted correctly.
The harvest light comes on,
and 6-10 seconds later, the
ice machine cycles from
freeze to harvest.
The control board is
causing the malfunction.
102
Part Number 80-01111-9 7/10
ICE PRODUCTION CHECK
The amount of ice a machine produces directly relates to the
operating water and air temperatures. This means an ice
machine with a 70°F (21.2°C) ambient temperature and 50°F
(10.0°C) water produces more ice than the same ice machine
with 90°F (32.2°C) ambient and 70°F (21.2°C) water.
1. Determine the ice machine operating conditions:
Air temp entering condenser: ____°
Air temp around ice machine: ____°
Water temp entering sump trough: ____°
2. Refer to the appropriate 24-Hour Ice Production Chart.
Use the operating conditions determined in Step 1 to
find published 24 hr. ice production:____
Times are in minutes.
Example: 1 min., 15 sec. converts to 1.25 min.
(15 seconds  60 seconds = .25 minutes)
Weights are in pounds.
Example: 2 lb., 6 oz. converts to 2.375 lb.
(6 oz. 16 oz. = .375 lb.)
3. Perform an ice production check using the formula
below.
1. _______
+
Freeze Time
2. 1440

Mins in 24 hrs
3. _______
Weight of One
Harvest
_______
=
Harvest Time
_______
=
Total Cycle Time
x
_______
Cycles Per Day
_______
Total Cycle Time
_______
Cycles Per Day
=
_______
Actual 24 Hr
Production
Weighing the ice is the only 100% accurate check. However,
if the ice pattern is normal and the 1/8" (.44 cm) thickness is
maintained, the ice slab weights listed with the 24-Hour Ice
Production Charts may be used.
4. Compare the results of step 3 with step 2. Ice production
is normal when these numbers match closely. If they
match closely, determine if:
Another larger ice machine is required.
Relocating the existing equipment to lower the load
conditions is required.
Contact the local Manitowoc distributor for information on
available options and accessories.
Part Number 80-01111-9 7/10
103
INSTALLATION AND VISUAL INSPECTION
CHECKLIST
Ice machine is not level
• Level the ice machine
Condenser is dirty
• Clean the condenser
Water filtration is plugged (if used)
• Install a new water filter
Water drains are not run separately and/or are not
vented
• Run and vent drains according to the Installation
Manual
104
Part Number 80-01111-9 7/10
WATER SYSTEM CHECKLIST
A water-related problem often causes the same
symptoms as a refrigeration system component
malfunction.
Example: A water dump valve leaking during the
freeze cycle, a system low on charge, and a starving
TXV have similar symptoms.
Water system problems must be identified and
eliminated prior to replacing refrigeration components.
Water area (evaporator) is dirty
• Clean as needed
Water inlet pressure not between 20 and 80 psig
(1–5 bar, 138–552 kPa)
• Install a water regulator valve or increase the
water pressure
Incoming water temperature is not between 35°F
(1.7°C) and 90°F (32.2°C)
• If too hot, check the hot water line check valves in
other store equipment
Water filtration is plugged (if used)
• Install a new water filter
Vent tube is not installed on water outlet drain
• See Installation Instructions
Hoses, fittings, etc., are leaking water
• Repair/replace as needed
Water float valve is stuck open or closed
• Clean/replace as needed
Water is spraying out of the sump trough area
• Stop the water spray
Uneven water flow across the evaporator
• Clean the ice machine
Water is freezing behind the evaporator
• Correct the water flow
Plastic extrusions and gaskets are not secured to
the evaporator
• Remount/replace as needed
Part Number 80-01111-9 7/10
105
ICE FORMATION PATTERN
Evaporator ice formation pattern analysis is helpful in
ice machine diagnostics.
Analyzing the ice formation pattern alone cannot
diagnose an ice machine malfunction. However, when
this analysis is used along with Manitowoc’s
Refrigeration System Operational Analysis Table, it
can help diagnose an ice machine malfunction.
Any number of problems can cause improper ice
formation.
Example: An ice formation that is “extremely thin at the
outlet” could be caused by a hot water supply, water
leaking out the overflow pipe, a faulty water float valve,
a low refrigerant charge, etc.
OUTLET
OUTLET
INLET
INLET
Q130
Q170/Q210/Q270
Examples of Evaporator Tubing Routing
Normal Ice Formation
Ice forms across the entire evaporator surface.
At the beginning of the Freeze cycle, it may appear
that more ice is forming on the inlet of the evaporator
than at the outlet. At the end of the Freeze cycle, ice
formation at the outlet will be close to, or just a bit
thinner than, ice formation at the inlet. The dimples in
the cubes at the outlet of the evaporator may be more
pronounced than those at the inlet. This is normal.
If ice forms uniformly across the evaporator surface,
but does not do so in the proper amount of time, this is
still considered a normal ice fill pattern.
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Part Number 80-01111-9 7/10
Extremely Thin at Evaporator Outlet
There is no ice, or a considerable lack of ice formation
on the outlet of the evaporator.
Examples: No ice at all at the outlet of the evaporator,
but ice forms at the inlet half of the evaporator. Or, the
ice at the outlet of the evaporator reaches the correct
thickness, but the outlet of the evaporator already has
1/2" to 1" of ice formation.
Possible cause: Water loss, low on refrigerant,
starving TXV, hot water supply, faulty float valve, etc.
Extremely Thin at Evaporator Inlet
There is no ice, or a considerable lack of ice formation
at the inlet of the evaporator. Examples: The ice at the
outlet of the evaporator reaches the correct thickness,
but there is no ice formation at all at the inlet of the
evaporator.
Possible cause: Insufficient water flow, flooding TXV,
etc.
Spotty Ice Formation
There are small sections on the evaporator where
there is no ice formation. This could be a single corner,
or a single spot in the middle of the evaporator. This is
generally caused by loss of heat transfer from the
tubing on the backside of the evaporator.
No Ice Formation
The ice machine operates for an extended period, but
there is no ice formation at all on the evaporator.
Possible cause: Water float valve, water pump,
starving expansion valve, low refrigerant charge,
compressor, etc.
Part Number 80-01111-9 7/10
107
SAFETY LIMIT FEATURE
In addition to the standard safety controls, your
Manitowoc ice machine features built-in safety limits
that will stop the ice machine if conditions arise which
could cause a major component failure.
Before calling for service, re-start the ice machine
using the following procedure:
1. Move the ON/OFF/WASH switch to OFF and then
back to ON.
2. If the safety limit feature has stopped the ice
machine, it will restart after a short delay. Proceed
to step 4.
3. If the ice machine does not restart, see “Ice
machine does not operate”.
4. Allow the ice machine to run to determine if the
condition is reoccurring.
A. If the ice machine stops again, the condition
has reoccurred. Call for service.
B. If the ice machine continues to run, the
condition has corrected itself. Allow the ice
machine to continue running.
108
Part Number 80-01111-9 7/10
Safety Limits
In addition to standard safety controls, the control
board has two built in safety limit controls which
protect the ice machine from major component
failures.
Safety Limit #1: If the freeze time reaches 60
minutes, the control board automatically initiates a
harvest cycle. 3 cycles outside the time limit = 1 hour
Stand-by Mode.
Safety Limit #2: If the harvest time reaches 3.5
minutes, the control board automatically returns the
ice machine to the freeze cycle. 3 cycles outside the
time limit = Safety Limit (must be MANUALLY reset).
Safety Limit Stand-by Mode: The first time a safety
limit shut down occurs, the ice machine turns off for 60
minutes (Stand-by Mode). The ice machine will then
automatically restart to see if the problem reoccurs.
During the Stand-by Mode the harvest light will be
flashing continuously and a safety limit indication can
be viewed. If the same safety limit is reached a second
time (the problem has reoccurred), the ice machine
will initiate a safety limit shut down and remain off until
it is manually restarted. During a safety limit shut down
the harvest light will be flashing continuously.
Determining Which Safety Limit Stopped
the Ice Machine: When a safety limit condition
causes the ice machine to stop, the harvest light on
the control board continually flashes on and off. Use
the following procedures to determine which safety
limit has stopped the ice machine.
1. Move the toggle switch to OFF.
2. Move the toggle switch back to ON.
3. Watch the harvest light. It will flash one or two
times, corresponding to safety limits 1 and 2, to
indicate which safety limit stopped the ice
machine.
After safety limit indication, the ice machine will restart
and run until a safety limit is exceeded again.
Part Number 80-01111-9 7/10
109
Safety Limit Notes
• A safety limit indication is completed before the
water pump starts. Water contacting the ice
thickness probe in the freeze cycle will cause the
harvest light to flash. Do not mistake a harvest light
flashing in the freeze cycle with a safety limit
indication.
• A continuous run of 100 harvests automatically
erases the safety limit code.
• The control board will store and indicate only one
safety limit – the last one exceeded.
• If the toggle switch is moved to the OFF position
and then back to the ON position prior to reaching
the 100-harvest point, the last safety limit
exceeded will be indicated.
• If the harvest light did not flash prior to the ice
machine restarting, then the ice machine did not
stop because it exceeded a safety limit.
110
Part Number 80-01111-9 7/10
ANALYZING WHY SAFETY LIMITS MAY STOP THE
ICE MACHINE
According to the refrigeration industry, a high
percentage of compressor failure is a result of external
causes. These can include flooding or starving
expansion valves, dirty condensers, water loss to the
ice machine, etc. The safety limits protect the ice
machine (primarily the compressor) from external
failures by stopping ice machine operation before
major component damage occurs.
The safety limit system is similar to a high-pressure
cutout control. It stops the ice machine, but does not
tell what is wrong. The service technician must
analyze the system to determine what caused the
high-pressure cutout, or a particular safety limit, to
stop the ice machine.
The safety limits are designed to stop the ice machine
prior to major component failures, most often a minor
problem or something external to the ice machine.
This may be difficult to diagnose, as many external
problems occur intermittently.
Example: An ice machine stops intermittently on
safety limit #1 (long freeze times). The problem could
be a low ambient temperature at night, a water
pressure drop; the water is turned off one night a
week, etc.
When a high-pressure cutout or a safety limit stops the
ice machine, they are doing what they are supposed to
do. That is, stopping the ice machine before a major
component failure occurs.
Refrigeration and electrical component failures may
also trip a safety limit. Eliminate all electrical
components and external causes first. If it appears
that the refrigeration system is causing the problem,
use Manitowoc’s Refrigeration System Operational
Analysis Table, along with detailed charts, checklists,
and other references to determine the cause.
Part Number 80-01111-9 7/10
111
Safety Limit Checklist
The following checklists are designed to assist the
service technician in analysis. However, because
there are many possible external problems, do not
limit your diagnosis to only the items listed.
Safety Limit #1
Freeze time exceeds 60 minutes for 6 consecutive
freeze cycles.
Possible Cause Checklist
Improper installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104
Water System
• Water Level set too high (water escaping through
over flow tube)
• Low water pressure (20 psig min.)
• High water pressure (80 psig max.)
• High water temperature (90°F/32.2°C max.)
• Clogged water distribution tube
• Dirty/defective float valve
• Defective water pump
Electrical System
• Ice thickness probe out of adjustment
• Harvest cycle not initiated electrically
• Contactor not energizing
• Compressor electrically non-operational
• Restricted condenser air flow
• High inlet air temperature (110°F/43.3°C max.)
• Condenser discharge air re-circulation
• Dirty condenser fins
• Defective fan cycling control
• Defective fan motor
• Low water pressure (20 psig min.)
• High water temperature (90°F/32.2°C max.)
• Dirty condenser
112
Part Number 80-01111-9 7/10
Refrigeration System
• Non-Manitowoc components
• Improper refrigerant charge
• Defective compressor
• TXV starving or flooding (check bulb mounting)
• Non-condensable in refrigeration system
• Plugged or restricted high side refrigerant lines or
component
• Defective hot gas valve
Part Number 80-01111-9 7/10
113
Safety Limit #2
Harvest time exceeds 3.5 minutes for 6
Consecutive harvest cycles.
Possible Cause Checklist
Improper installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Water System
• Water area (evaporator) dirty
• Dirty/defective water dump valve
• Vent tube not installed on water outlet drain
• Water freezing behind evaporator
• Plastic extrusions and gaskets not securely
mounted to the evaporator
• Low water pressure (20 psig min.)
• Loss of water from sump area
• Clogged water distribution tube
• Dirty/defective float valve
• Defective water pump
Electrical system
• Ice thickness probe out of adjustment
• Ice thickness probe dirty
• Bin switch defective
• Premature harvest
Refrigeration system
• Non-Manitowoc components
• Improper refrigerant charge
• Defective hot gas valve
• TXV flooding (check bulb mounting)
• Defective fan cycling control
114
Part Number 80-01111-9 7/10
ANALYZING DISCHARGE PRESSURE
Q130/Q170/Q210/Q270 Ice Machines Only
1. Determine the ice machine operating conditions:
Air temp. entering condenser
______
Air temp. around ice machine
______
Water temp. entering sump trough ______
2. Refer to “Cycle Times, 24 Hr. Ice Production and
Refrigerant Pressure Charts” on page 203 for ice
machine being checked.
Use the operating conditions determined in step 1 to
find the published normal discharge pressures.
Freeze Cycle
______
Harvest Cycle
______
3. Perform an actual discharge pressure check.
Freeze
Cycle PSIG
Harvest
Cycle PSIG
Beginning of
Cycle
__________
__________
Middle of
Cycle
__________
__________
End of
Cycle
__________
__________
4. Compare the actual discharge pressure (step 3)
with the published discharge pressure (step 2).
The discharge pressure is normal when the actual
pressure falls within the published pressure range for
the ice machine’s operating conditions. It is normal for
the discharge pressure to be higher at the beginning of
the freeze cycle (when load is greatest), then drop
through out the freeze cycle.
Part Number 80-01111-9 7/10
115
Discharge Pressure High Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Restricted Condenser Air Flow
• High inlet air temperature
• Condenser discharge air re-circulation
• Dirty condenser fins
• Defective fan cycling control
• Defective fan motor
Improper Refrigerant Charge
• Overcharged
• Non-condensable in system
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• High side refrigerant lines/component
• Restricted (before mid-condenser)
Freeze Cycle Discharge Pressure Low Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• High side refrigerant lines/component restricted
(before mid-condenser)
• Defective fan cycle control
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.
116
Part Number 80-01111-9 7/10
ANALYZING SUCTION PRESSURE
Q130/Q170/Q210/Q270 Ice Machines Only
The suction pressure gradually drops throughout the
freeze cycle. The actual suction pressure (and drop
rate) changes as the air and water temperature
entering the ice machine changes. These variables
also determine the freeze cycle times.
To analyze and identify the proper suction pressure
drop throughout the freeze cycle, compare the
published suction pressure to the published freeze
cycle time.
NOTE: Analyze discharge pressure before analyzing
suction pressure. High or low discharge pressure may
be causing high or low suction pressure.
Part Number 80-01111-9 7/10
117
Procedure
Step
1. Determine the ice machine operating conditions.
Example:
Air temp. entering condenser: 90°F/32.2°C
Air temp. around ice machine: 80°F/26.7°C
Water temp. entering water fill valve: 70°F/21.1°C
2A. Refer to “Cycle Time” and “Operating Pressure” charts
for ice machine model being checked. Using operating
conditions from Step 1, determine published freeze cycle
time and published freeze cycle suction pressure.
Example:
Published freeze cycle time: 14.8 - 15.9 minutes
Published freeze cycle suction pressure: 65 - 26 psig
2B. Compare the published freeze cycle time and
published freeze cycle suction pressure. Develop a chart.
Example:
Published Freeze Cycle Time (minutes)
1
2
4
7
10
12
14
|
|
|
|
|
|
|
65
55
47
39
34
30
26
Published Freeze Cycle Suction Pressure (psig)
In the example, the proper suction pressure should be
approximately 39 psig at 7 minutes; 30 psig at 12
minutes; etc.
3. Perform an actual suction pressure check at the
beginning, middle and end of the freeze cycle. Note the
times at which the readings are taken.
Example:
Manifold gauges were connected to the example ice
machine and suction pressure readings taken as
follows: ________ PSIG
Beginning of Freeze cycle: 79 (at 1 min.)
Middle of freeze cycle: 48 (at 7 min.)
End of freeze cycle: 40 (at 14 min.)
4. Compare the actual freeze cycle suction pressure (Step
3) to the published freeze cycle time and pressure
comparison (Step 2B). Determine if the suction pressure is
high, low or acceptable.
Example:
In this example, the suction pressure is considered high
throughout the freeze cycle. It should have been:
Approximately 65 psig (at 1 minute) – not 79
Approximately 39 psig (at 7 minutes) – not 48
Approximately 26 psig (at 14 minutes) – not 40
118
Part Number 80-01111-9 7/10
Suction Pressure High Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Discharge Pressure
• Discharge pressure is too high, and is affecting
suction pressure, refer to “Discharge Pressure
High Checklist” on page 150.
Improper Refrigerant Charge
• Overcharged
• Wrong type of refrigerant
• Non-condensables in system
Other
• Non-Manitowoc components in system
• Hot gas valve leaking
• TXV flooding (check bulb mounting)
• Defective compressor
Part Number 80-01111-9 7/10
119
Suction Pressure Low Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Discharge Pressure
• Discharge pressure is too low, and is affecting
suction pressure, refer to “Freeze Cycle Discharge
Pressure Low Checklist”
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• Improper water supply over evaporator refer to
“Water System Checklist” on page 105.
• Loss of heat transfer from tubing on back side of
evaporator
• Restricted/plugged liquid line drier
• Restricted/plugged tubing in suction side of
refrigeration system
• TXV starving
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.
120
Part Number 80-01111-9 7/10
HOT GAS VALVE
General
The hot gas valve is an electrically operated valve that
opens when energized, and closes when deenergized.
Normal Operation
The valve is de-energized (closed) during the freeze
cycle and energized (open) during the harvest cycle.
The valve is positioned between the receiver and the
evaporator and performs two functions:
1. Prevents refrigerant from entering the evaporator
during the freeze cycle.
The hot gas valve is not used during the freeze
cycle. The hot gas valve is de-energized (closed)
preventing refrigerant flow from the receiver into
the evaporator.
2. Allows refrigerant vapor to enter the evaporator in
the harvest cycle.
During the harvest cycle, the hot gas valve is
energized (open) allowing refrigerant gas from the
discharge line of the compressor to flow into the
evaporator. The heat is absorbed by the
evaporator and allows release of the ice slab.
Exact pressures vary according to ambient
temperature and ice machine model. Harvest
pressures (for Q130/Q170/Q210/Q270 ice machines)
can be found in the Cycle Time/24 Hour Ice
Production/ Refrigerant Pressure Charts in this book.
Part Number 80-01111-9 7/10
121
Hot Gas Valve Analysis
The valve can fail in two positions:
• Valve will not open in the harvest cycle.
• Valve remains open during the freeze cycle.
VALVE WILL NOT OPEN IN THE HARVEST CYCLE
Although the circuit board has initiated a harvest cycle,
the evaporator temperature remains unchanged from
the freeze cycle.
! Caution
Coil must be seated 100% on solenoid to function
correctly. Inst all coil with a twisting motion to
properly seat.
VALVE REMAINS OPEN IN THE FREEZE CYCLE:
Symptoms of a hot gas valve remaining partially open
during the freeze cycle can be similar to symptoms of
an expansion valve, float valve or compressor
problem. Symptoms are dependent on the amount of
leakage in the freeze cycle.
A small amount of leakage will cause increased freeze
times and an ice fill pattern that is “Thin at the Outlet”,
but fills in at the end of the cycle.
As the amount of leakage increases the length of the
freeze cycle increases and the amount of ice at the
outlet of the evaporator decreases.
Refer to the Parts Manual for proper valve application.
If replacement is necessary, use only “original”
Manitowoc replacement parts.
122
Part Number 80-01111-9 7/10
Use the following procedure and table to help
determine if a hot gas valve is remaining partially open
during the freeze cycle.
1. Wait five minutes into the freeze cycle.
2. Feel the inlet of the hot gas valve(s).
Important
Feeling the hot g as valve outlet or across the hot
gas valve itself will not work for this comparison.
The h ot g as val ve o utlet i s on the suction sid e
(cool refrigerant). It may be cool enough to touch
even if the valve is leaking.
3. Feel the compressor discharge line.
! Warning
The inlet of the hot gas valve and the compressor
discharge line could be h ot e nough to bu rn your
hand. Just touch them momentarily.
4. Compare the temperature of the inlet of the hot
gas valves to the temperature of the compressor
discharge line.
Part Number 80-01111-9 7/10
123
Findings
Comments
The inlet of the harvest
valve is cool enough to
touch and the compressor
discharge line is hot.
This is normal as the
discharge line should
always be too hot to touch
and the harvest valve inlet,
although too hot to touch
during harvest, should be
cool enough to touch after 5
minutes into the freeze
cycle.
Cool & Hot
The inlet of the harvest
valve is hot and approaches
the temperature of a hot
compressor discharge line.
Hot & Hot
Both the inlet of the harvest
valve and the compressor
discharge line are cool
enough to touch.
Cool & Cool
This is an indication
something is wrong, as the
harvest valve inlet did not
cool down during the freeze
cycle. If the compressor
dome is also entirely hot,
the problem is not a harvest
valve leaking, but rather
something causing the
compressor (and the entire
ice machine) to get hot.
This is an indication
something is wrong, causing
the compressor discharge
line to be cool to the touch.
This is not caused by a
harvest valve leaking.
5. Record your findings on the table.
124
Part Number 80-01111-9 7/10
COMPARING EVAPORATOR INLET/OUTLET
TEMPERATURES
Q130/Q170/Q210/Q270 Ice Machines Only
The temperatures of the suction lines entering and
leaving the evaporator alone cannot diagnose an ice
machine. However, comparing these temperatures
during the freeze cycle, along with using Manitowoc’s
Refrigeration System Operational Analysis Table, can
help diagnose an ice machine malfunction.
The actual temperatures entering and leaving the
evaporator vary by model, and change throughout the
freeze cycle. This makes documenting the “normal”
inlet and outlet temperature readings difficult. The key
to the diagnosis lies in the difference between the two
temperatures five minutes into the freeze cycle. These
temperatures must be within 7°F (4°C) of each other.
Use this procedure to document freeze cycle inlet and
outlet temperatures.
1. Use a quality temperature meter, capable of
taking temperature readings on curved copper
lines.
2. Attach the temperature meter sensing device to
the copper lines entering and leaving the
evaporator.
Important
Do not simply insert the sensing device under the
insulation. It must be attached to and reading the
actual temperature of the copper line.
3. Wait five minutes into the freeze cycle.
4. Record the temperatures below and determine
the difference between them.
___________
___________
___________
Inlet
Temperature
Difference must be
within 7°F (4°C) at
5 minutes into the
freeze cycle
Outlet
Temperature
5. Use this with other information gathered on the
Refrigeration System Operational Analysis Table
to determine the ice machine malfunction.
Part Number 80-01111-9 7/10
125
DISCHARGE LINE TEMPERATURE ANALYSIS
Q130/Q170/Q210/Q270 Ice Machines Only
GENERAL
Knowing if the discharge line temperature is
increasing, decreasing or remaining constant can be
an important diagnostic tool. Maximum compressor
discharge line temperature on a normally operating ice
machine steadily increases throughout the freeze
cycle. Comparing the temperatures over several
cycles will result in a consistent maximum discharge
line temperature.
Ambient air temperatures affect the maximum
discharge line temperature.
Higher ambient air temperatures at the condenser =
higher discharge line temperatures at the compressor.
Lower ambient air temperatures at the condenser =
lower discharge line temperatures at the compressor.
Regardless of ambient temperature, the freeze cycle
discharge line temperature will be higher than 150°F
(66°C) on a normally operating ice machine.
PROCEDURE
Connect a temperature probe on the compressor
discharge line within 6" (15.2 cm) of the compressor.
Observe the discharge line temperature for the last
three minutes of the freeze cycle and record the
maximum discharge line temperature.
126
Part Number 80-01111-9 7/10
Discharge Line Temperature Above 150°F (66°C) at
End of Freeze Cycle:
Ice machines that are operating normally will have
consistent maximum discharge line temperatures
above 150°F (66°C).
Verify the expansion valve sensing bulb is positioned
and secured correctly.
Discharge Line Temperature Below 150°F (66°C) at
End of Freeze Cycle
Ice machines that have a flooding expansion valve will
have a maximum discharge line temperature that
decreases each cycle.
Verify the expansion valve sensing bulb is 100%
insulated and sealed airtight. Condenser air contacting
an incorrectly insulated sensing bulb will cause
overfeeding of the expansion valve.
Part Number 80-01111-9 7/10
127
REFRIGERATION COMPONENT DIAGNOSTIC
CHART
Q130/Q170/Q210/Q270 Ice Machines Only
All electrical and water related problems must be
corrected before these charts will work properly. These
tables must be used with charts, checklists and other
references to eliminate refrigeration components not
listed and external items and problems that will cause
good refrigeration components to appear defective.
The tables list four different defects that may affect the
ice machine’s operation.
NOTE: A low-on-charge ice machine and a starving
expansion valve have very similar characteristics and
are listed under the same column.
128
Part Number 80-01111-9 7/10
PROCEDURE
Step 1 Complete each item individually in the
“Operational Analysis” column.
Enter check marks (✓) in the boxes.
Each time the actual findings of an item in the
“Operational Analysis” column matches the published
findings on the table, enter a check mark.
Example: Freeze cycle suction pressure is determined
to be low. Enter a check mark in the “low” box.
Perform the procedures and check all information
listed. Each item in this column has supporting
reference material.
While analyzing each item separately, you may find an
“external problem” causing a good refrigerant
component to appear bad. Correct problems as they
are found. If the operational problem is found, it is
not necessary to complete the remaining
procedures.
Step 2 Add the check marks listed under each of the
four columns. Note the column number with the
highest total and proceed to “Final Analysis.”
NOTE: If two columns have matching high numbers, a
procedure was not
performed prope rly and/or
supporting material was not analyzed correctly.
Part Number 80-01111-9 7/10
129
FINAL ANALYSIS
The column with the highest number of check marks
identifies the refrigeration problem.
Column 1 – Hot Gas Valve Leaking
A leaking hot gas valve must be replaced.
Column 2 – Low Charge/TXV Starving
Normally, a starving expansion valve only affects the
freeze cycle pressures, not the harvest cycle
pressures. A low refrigerant charge normally affects
both pressures. Verify the ice machine is not low on
charge before replacing an expansion valve.
Add refrigerant charge in 2 oz. increments as a
diagnostic procedure to verify a low charge. (Do not
add more than the total charge of refrigerant). If the
problem is corrected, the ice machine is low on
charge. Find the refrigerant leak.
The ice machine must operate with the nameplate
charge. If the leak cannot be found, proper refrigerant
procedures must still be followed. Change the liquid
line drier, evacuate the system and weigh in the proper
charge.
If the problem is not corrected by adding charge, the
expansion valve is faulty.
Column 3 – TXV Flooding
A loose or improperly mounted expansion valve bulb
causes the expansion valve to flood. Check bulb
mounting, insulation, etc., before changing the valve.
Column 4 – Compressor
Replace the compressor and start components. To
receive warranty credit, the compressor ports must be
properly sealed by crimping and soldering them
closed. Old start components must be returned with
the faulty compressor.
130
Part Number 80-01111-9 7/10
4
Part Number 80-01111-9 7/10
Ice Formation
Pattern
Ice formation is
extremely thin on
top of evaporator
-orNo ice formation
on entire
evaporator
Ice formation is
extremely thin on
top of evaporator
-orNo ice formation
on entire
evaporator
Ice formation is
normal
-orice formation is
extremely thin on
the bottom of the
evaporator or
No ice formation
on evaporator
Ice formation is
normal
-orNo ice formation
on entire
evaporator
All installation and water related problems must be corrected
before proceeding with chart.
3
Installation and
Water system
2
Published 24 hour ice production ____________
Calculated (actual) 24 hour ice production ____________
Note: The ice machine is operating properly if the ice fill patterns is normal and ice
production is within 10% of charted capacity.
1
Ice Production
Operational
Analysis
REFRIGERATION COMPONENT DIAGNOSTIC
CHART
Q130/Q170/Q210/Q270 Ice Machines Only
131
132
Freeze cycle
Suction Pressure
_______
_______
_______
1 minute Middle End
Stops on
safety limit:
1
2
Stops on
safety limit:
1 or 2
3
Stops on
safety limit:
1
4
Suction
pressure is
High
Suction
pressure is
Low
Suction
pressure is
High
Suction
pressure is
High
If suction pressure is High or Low refer to freeze cycle high or low
suction pressure problem checklist to eliminate problems and/or
components not listed on this table before proceeding.
If discharge pressure is High or Low, refer to freeze cycle high or
low discharge pressure problem checklist to eliminate problems
and/or components not listed on this table before proceeding.
Stops on
safety limit:
1 or 2
Safety limits
Refer to “Analyzing Safety
Limits” to eliminate all nonrefrigeration problems.
Freeze cycle
Discharge Pressure
_______
_______
_______
1 minute Middle End
1
Operational Analysis
Q130/Q170/Q210/Q270 Ice Machines Only
(continued)
Part Number 80-01111-9 7/10
Part Number 80-01111-9 7/10
Hot Gas Valve
Leaking
Discharge Line Temp.
Record freeze cycle
discharge line temp at the
end of freeze cycle.
Final Analysis
Enter total number of
boxes checked in
each column.
Compressor
Discharge line
temp 150°F
(66°C) or higher
at the end of
freeze cycle
Discharge line
temp less than
150°F (66°C) at
the end of freeze
cycle
Discharge line
temp 150°F
(66°C) or higher
at the end of
freeze cycle
Discharge line
temp 150°F
(66°C) or higher
at the end of
freeze cycle
Hot Gas Valve
TXV Flooding
The hot gas valve
inlet is
COOL
and
The compressor
discharge line is
HOT
The hot gas valve
inlet is
COOL
and
The compressor
discharge line is
COOL
The hot gas valve
inlet is
COOL
and
The compressor
discharge line is
HOT
The hot gas valve
inlet is
HOT
and
The compressor
discharge line is
HOT
Low On Charge
-orTXV Starving
4
3
2
1
Operational Analysis
Q130/Q170/Q210/Q270 Ice Machines Only
(continued)
133
QM20/QM30
DIAGNOSING AN ICE MACHINE
THAT WILL NOT RUN
! Warning
High (line) voltage is applied to the co ntrol board
(terminals #8 and #2 ) at all times. Removin g
control board fuse or moving the toggle switch to
OFF wil l not remove the powe r supplied to th e
control board.
1. Verify primary voltage is supplied to ice machine.
2. Verify that the fuse or circuit breaker is closed.
3. Verify control board fuse is OK. If the power light
functions, the fuse is OK.
4. Verify ICE/OFF/WASH toggle switch functions
properly. A defective toggle switch may keep the
ice machine in the OFF mode.
5. Verify the bin thermostat functions properly. A
defective bin thermostat can falsely indicate a full
bin of ice.
6. Verify low DC voltage is properly grounded. Loose
DC wire connections may intermittently stop the
ice machine.
7. Replace the control board.
8. Be sure steps 1-6 were followed thoroughly.
Intermittent problems are not usually related to
the control board.
134
Part Number 80-01111-9 7/10
REFRIGERATION DIAGNOSTICS
QM20
The QM20 ice machines have a very small refrigerant
charge, 4.59 oz (130 g) and we do not recommend
diagnosing the ice machine using refrigerant pressures. For
this reason we have not included refrigeration access fittings.
Verify that your water flow is even across the entire
evaporator before diagnosing the refrigeration system.
Mineral build-up on the evaporator assembly can cause
water tracking and an erratic ice fill pattern. Clean with
Manitowoc Ice Machine cleaner to remove any mineral buildup before entering the refrigeration system.
The following can be used for diagnostics:
Capillary Tube failures or low refrigerant charge will always
result in a starving evaporator.
Assume 86°F (30°C) air temperature 68°F (20°C) water
temperature.
Suction line temperature at the compressor will range from
86°F (30°C) three minutes into the cycle to 8°F (-13°C) at the
end of the freeze cycle. An obstructed capillary tube or low
refrigerant charge will have a suction line temperature higher
than normal.
Discharge line temperature at the compressor will range from
168°F (76°C) to 140°F (60°C) through the freeze cycle. An
obstructed capillary tube or low refrigerant charge will have a
lower discharge line temperature than normal.
Suction line temperature at the compressor will range from
64°F (18°C) to 111°F (44°C) through the harvest cycle. An
obstructed capillary tube will not affect suction line
temperature range during the harvest cycle. Low refrigerant
charge will have a lower temperature than normal.
Discharge line temperature at the compressor will range from
180°F (82°C) to 150°F (60°C) through the harvest cycle. An
obstructed capillary tube will not affect discharge line
temperature range during the harvest cycle. Low refrigerant
charge will have a lower temperature than normal.
Ice fill pattern will vary depending on severity of the
obstruction or refrigeration loss. Ice fill patterns will range
from no ice on the entire evaporator to thin only at the
evaporator outlet (thin at the bottom, thick at the top of the
evaporator).
Part Number 80-01111-9 7/10
135
QM30
The QM30 ice machines have a very small refrigerant
charge, 5.78 oz (165 g) and we do not recommend
diagnosing the ice machine using refrigerant pressures. For
this reason we have not included refrigeration access fittings.
Verify that your water flow is even across the entire
evaporator before diagnosing the refrigeration system.
Mineral build-up on the evaporator assembly can cause
water tracking and an erratic ice fill pattern. Clean with
Manitowoc Ice Machine cleaner to remove any mineral buildup before entering the refrigeration system.
The following can be used for diagnostics:
Capillary Tube failures or low refrigerant charge will always
result in a starving evaporator.
Assume 86°F (30°C) air temperature 68°F (20°C) water
temperature.
Suction line temperature at the compressor will range from
86°F (30°C) three minutes into the cycle to 8°F (-13°C) at the
end of the freeze cycle. An obstructed capillary tube or low
refrigerant charge will have a suction line temperature higher
than normal.
Discharge line temperature at the compressor will range from
168°F (76°C) to 140°F (60°C) through the freeze cycle. An
obstructed capillary tube or low refrigerant charge will have a
lower discharge line temperature than normal.
Suction line temperature at the compressor will range from
64°F (18°C) to 111°F (44°C) through the harvest cycle. An
obstructed capillary tube will not affect suction line
temperature range during the harvest cycle. Low refrigerant
charge will have a lower temperature than normal.
Discharge line temperature at the compressor will range from
180°F (82°C) to 150°F (60°C) through the harvest cycle. An
obstructed capillary tube will not affect discharge line
temperature range during the harvest cycle. Low refrigerant
charge will have a lower temperature than normal.
Ice fill pattern will vary depending on severity of the
obstruction or refrigeration loss. Ice fill patterns will range
from no ice on the entire evaporator to thin only at the
evaporator outlet (thin at the bottom, thick at the top of the
evaporator).
136
Part Number 80-01111-9 7/10
ICE FORMATION PATTERN
Evaporator ice formation pattern analysis is helpful in
ice machine diagnostics.
Analyzing the ice formation pattern alone cannot
diagnose an ice machine malfunction. However, when
this analysis is used along with Manitowoc’s
Refrigeration System Operational Analysis Table, it
can help diagnose an ice machine malfunction.
Any number of problems can cause improper ice
formation.
Example: An ice formation that is “extremely thin at the
outlet” could be caused by a hot water supply, water
leaking water out the overflow pipe, a faulty water float
valve, a low refrigerant charge, etc.
INLET
OUTLET
QM20/QM30
Evaporator Tubing Routing
Part Number 80-01111-9 7/10
137
Ice Production Check
The QM20/QM30 dice ice cube formation is slightly different
from our previous models. Manitowoc ice machines have a
unique cube shape. It is normal to have a dimple in the ice
cube (a concave indentation in the cube). Ice cubes from the
QM20/QM30 may appear to have a slightly larger dimple
than other Manitowoc ice cube machines. Therefore, cube
size for the QM20/QM30 is determined by measuring the slab
weight (the combined weight of all cubes from one harvest
cycle). To determine proper slab weight, follow the
instructions listed below.
1. Ensure the air filter, front, and back panels are installed
properly and close the bin door.
2. During the third harvest cycle open the bin door and
catch the entire slab of ice.
3. Weigh the ice slab. The combined weight of all cubes
from one harvest should weigh between 7 – 9 oz 
(200 – 270 g). If the slab weight is within this range, the
ice machine is working properly and no further action is
needed. If the slab weight is not within this range or you
desire a slightly thicker or thinner cube, continue to step
4.
! Warning
Disconnect ele ctric p ower to th e ice machin e at
the electric switch box before proceeding.
4. Remove the air filter.
5. Remove the two screws holding the front panel in place
and remove the front cover.
Locate the ice thickness control dial on the control board (see
figure). Turn the dial clockwise for a thicker cube or counter
clockwise for a thinner cube.
6. Ensure all of the panels and air filter are reinstalled
properly and the bin door is closed. Repeat steps 1 – 3.
ICE
THICKNESS
CONTROL
DIAL
SV1710_2
138
Part Number 80-01111-9 7/10
QM45
ELECTRICAL
The QM45 electrical sequence of Operation and
troubleshooting is identical to the Q130/Q210/Q270.
Refer to those models for electrical troubleshooting of:
• Ice machine will not run
• Diagnosing Ice Thickness Control Circuitry
• Ice production check
• Ice formation pattern
• Safety limits
Refer to the following pages for refrigeration
diagnostics.
Part Number 80-01111-9 7/10
139
REFRIGERATION DIAGNOSTICS
Important:
• DO NOT install a manifold gauge set on the ice
machine! Refrigerant pressures are not used to
diagnose this ice machine.
• If the ice machine is “slushing” remove the screen
from the bottom of the water pump.
• Normal Ice Fill Pattern is less fill on the left side of
the evaporator. This occurs because the
refrigeration tubing exits the evaporator on the left
side.
OUTLET
INLET
QM45
Evaporator Tubing Routing
Procedure
1. Remove siphon cap from siphon tube and verify
that the water level is between 1/4 and 3/8 inch
(6.4 – 9.5 mm) from the top of the standpipe, a
line in the water trough indicates the correct level.
SET THE WATER LEVEL TO THE
LINE IN THE WATER TROUGH
SIPHON
CAP
SV1689-2
2. Verify that the incoming water pressure is more
than 20 psi and less than 80 psi.
140
Part Number 80-01111-9 7/10
3. Verify that the ice thickness probe is properly
adjusted.
ADJUSTING
SCREW
1/8" ICE BRIDGE
THICKNESS
SV3114
SV3113
Ice Thickness Adjustment
4. Verify that the machine has properly sized drain
line leaving the machine and that the bin drain is
not restricted. Refer to “Drain Connections” on
page 31 for installation details.
BIN DRAIN
5/8" I.D.
(1.59 MM)
SV1735
Part Number 80-01111-9 7/10
141
5. Install thermometer thermocouples on Suction
and Discharge line:
• Digital thermometers with remote
thermocouples must be used to obtain
temperatures
• Suction and Discharge line thermocouples
must be within 3" (76.2 mm) of the compressor
• Thermocouples must be insulated
• Doors and all panels must be in place
• Initial freeze cycle is not used for diagnostics.
Start monitoring temperatures 3 minutes into
the second freeze cycle.
6. Compare Suction and Discharge temperatures to
“QM45 Operating Temperatures” on page 207.
The charts list Normal suction and discharge
temperatures.
Analysis
Discharge
Line Temp
Suction
Line
Temp
Normal
Normal
Less fill on the
This is normal
left side of the
operation
evaporator
Low (20°F
[-7°C] or
more)
Low
(20°F
[-7°C] or
more)
Less fill on the
left side of the
evaporator
Normal or
High
High
(10°F
[-12°C] or
more)
Less fill on the
Low on
left side and
Refrigerant/
top 2 rows of
Expansion
the
Valve Starving
evaporator
Normal
Low (5°F
[-15°C] or
less)
Less fill on the
left side of the
evaporator
142
Ice Fill
Pattern
Refer to
Diagnostics
for:
Expansion
Valve
Flooding
Refrigerant
Overcharge
Part Number 80-01111-9 7/10
FLOODING EXPANSION VALVE
A flooding expansion valve will have discharge and
suction line temperatures 20°F (-7°C) lower than
normal freeze cycle temperatures. Normal suction line
temperature and low discharge line temperature DO
NOT verify a flooding valve. Both discharge line
temperature and suction line temperature must be low
to verify a flooding expansion valve. Ice fill pattern is
thin on the left hand side of the evaporator.
STARVING EXPANSION VALVE/LOW
REFRIGERANT CHARGE
Important
Confirm water float valve is set correctly . An
overflowing st andpipe mimics these symptoms
exactly.
SYMPTOMS:
•
Ice Fill Pattern
• Thin on top two rows of the evaporator
• Thin on entire left side of the evaporator
• Thick on the bottom of the evaporator
• Freeze time longer than normal
Diagnosis can be confirmed by adding 2 oz (56.7 g) of
refrigerant: if the Suction line temperature drops or the
ice fill pattern on the top two rows fills in, the ice
machine is low on refrigerant. Refer to charging
procedures for access valve installation procedure.
OVERCHARGED SYSTEM
Suction line temperature will be slightly low during
freeze cycle 5°F (-15°C). Discharge line temperature
is normal. Actual amperage readings will be higher
than nameplate rating.
Part Number 80-01111-9 7/10
143
SM50
DIAGNOSING AN ICE MACHINE
THAT WILL NOT RUN
! Warning
High (line) voltage is applied to the control board
(terminals #20 an d # 21) at all times. Re moving
control board fuse o r moving the tog gle switch to
OFF wi ll not remove the po wer supp lied to the
control board.
1. Verify primary voltage is supplied to ice machine.
2. Verify that the fuse or circuit breaker is closed and
the ice machine is plugged into a receptacle.
3. Verify control board fuse is OK.
4. Verify the transformer is supplying power to the
control board.
• If the interior light functions or the red control
board light is energized the transformer is OK.
• If the transformer is supplying power to the
control board and the red control board light
will not energize, replace the control board.
5. Verify the “Power” switch functions properly.
• If the red control board light is energized and
depressing the “Power” switch does not
energize the green “Power” light, check the
interconnecting wire, then replace the interface
board.
6. Verify the bin thermostat functions properly.
• The green “Power” light will be energized and
the ice machine will function in the “Clean”
cycle when the bin thermostat is open.
7. Check control board light to see if ice machine
shutdown on over temperature limit (control board
light will flash rapidly).
8. Replace the control board.
• Be sure Steps 1-6 were followed thoroughly.
Intermittent problems are not usually related to
the control board.
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Part Number 80-01111-9 7/10
ICE MACHINE WILL NOT HARVEST
1. Verify cubes are present in evaporator and freeze
time exceeds freeze chart cycle time.
• Initial freeze cycle after resetting at toggle
switch will be 5 minutes longer than chart time
(refer to “Sequence of Operation” on page 86).
• Verify control board is not set for additional
freeze time to fill out the ice cubes, see “Cube
Weight Adjustment” on page 97.
2. Observe control board light:
• Steady light indicates thermistor operation is
normal.
• Slow flash indicates a thermistor problem
(open or disconnected). Verify liquid line
thermistor is connected to control board,
securely attached to liquid line and insulated.
Refer to Resistance chart and Ohm thermistor.
• Rapid flash indicates liquid line temperature
exceeded 170°F (76.7°C) (refer to “Discharge
Pressure High Checklist” on page 150). If
unable to determine cause, refer to Resistance
chart and Ohm thermistor.
3. Reset ice machine.
• Wait freeze cycle time plus an additional 5
minutes (refer to “Sequence of Operation” on
page 86).
4. Verify the water inlet valve is energized during the
entire harvest cycle and water flow is normal.
• Although the hot gas valve is energized, the
ice machine will not consistently harvest if the
water inlet valve does not energize or has low
water flow.
5. Check for power at the hot gas valve
• Power is present – replace coil/valve.
• No power at hot gas valve – check for power at
circuit board connector, replace control board if
no power is present.
Part Number 80-01111-9 7/10
145
ICE QUALITY IS POOR — CUBES ARE SHALLOW,
INCOMPLETE OR WHITE
Ice machine is dirty
• Clean and sanitize the ice machine
Water filtration is poor
• Replace the filter
Water softener is working improperly (if
applicable)
• Repair the water softener
Poor incoming water quality
• Contact a qualified company to test the quality of
the incoming water and make appropriate filter
recommendations
Water escaping from sump during freeze cycle
• Check standpipe and drain
• Check for water tracking out of water circuit
146
Part Number 80-01111-9 7/10
FREEZE CYCLE IS LONG, LOW ICE PRODUCTION
Water temperature is too high
• Connect to a cold water supply, verify check valves
in faucets and other equipment are functioning
correctly
Dirty Condenser
• Clean condenser
High air temperature entering condenser
• Air temperature must not exceed 120°F (39°C)
Water inlet valve filter screen is dirty
• Remove the water inlet valve and clean the filter
screen
Water inlet valve stuck open or leaking
• Turn off ice machine, if water continues to enter ice
machine, verify water pressure is ok then replace
water inlet valve
Water inlet valve is not working
• Water inlet valve must be replaced
Refrigeration problem
• Refer to refrigeration diagnostics
Water escaping from sump during freeze cycle
• Check standpipe and drain
• Check for water tracking out of water circuit
Part Number 80-01111-9 7/10
147
ICE MACHINE RUNS AND NO ICE IS PRODUCED
No water to ice machine
• Correct water supply
Incorrect incoming water pressure
• Water pressure must be 20-80 psi (1.4-5.5 bar)
Spray nozzle is blocked with mineral buildup
• Clean and sanitize the ice machine
Ambient temperature is too high or low
• Ambient temperature must be between 50°F and
110°F (10°C and 43°C)
Thermistor Disconnected or Open
• Refer to thermistor diagnostics
148
Part Number 80-01111-9 7/10
ANALYZING DISCHARGE PRESSURE
1. Determine the ice machine operating conditions:
Air temp. entering condenser
______
Air temp. around ice machine
______
Water temp. entering sump trough ______
2. Refer to “Cycle Times, 24 Hr. Ice Production and
Refrigerant Pressure Charts” on page 203 for ice
machine being checked.
Use the operating conditions determined in step 1 to
find the published normal discharge pressures.
Freeze Cycle ______
Harvest Cycle______
3. Perform an actual discharge pressure check.
Freeze
Cycle PSIG
Harvest
Cycle PSIG
Beginning of
Cycle
__________
__________
Middle of
Cycle
__________
__________
End of Cycle
__________
__________
4. Compare the actual discharge pressure (step 3)
with the published discharge pressure (step 2).
The discharge pressure is normal when the actual
pressure falls within the published pressure range for
the ice machine’s operating conditions. It is normal for
the discharge pressure to be higher at the beginning of
the freeze cycle (when load is greatest), then drop
throughout the freeze cycle.
Part Number 80-01111-9 7/10
149
DISCHARGE PRESSURE HIGH CHECKLIST
Improper Installation
• Refer to“Installation and Visual Inspection
Checklist” on page 104.
Restricted Condenser Air Flow
• High inlet air temperature
• Condenser discharge air re-circulation
• Dirty condenser fins
• Defective fan motor
Improper Refrigerant Charge
• Overcharged
• Non-condensable in system
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• High side refrigerant lines/component restricted
(before mid-condenser)
FREEZE CYCLE DISCHARGE PRESSURE LOW
CHECKLIST
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• High side refrigerant lines/component restricted
(after condenser)
• Ambient temperature too low
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.
150
Part Number 80-01111-9 7/10
ANALYZING SUCTION PRESSURE
The suction pressure gradually drops throughout the
freeze cycle. The actual suction pressure (and drop
rate) changes as the air and water temperature
entering the ice machine changes. These variables
also determine the freeze cycle times.
To analyze and identify the proper suction pressure
drop throughout the freeze cycle, compare the
published suction pressure to the published freeze
cycle time.
NOTE: Analyze discharge pressure before analyzing
suction pressure. High or low discharge pressure may
be causing high or low suction pressure.
Part Number 80-01111-9 7/10
151
Procedure
Step
1. Determine the ice machine operating conditions.
Example:
Air temp. entering condenser: 90°F/32.2°C
Air temp. around ice machine: 80°F/26.7°C
Water temp. entering water fill valve: 70°F/21.1°C
2A. Refer to “Cycle Time” and “Operating Pressure” charts
for ice machine model being checked. Using operating
conditions from Step 1, determine published freeze cycle
time and published freeze cycle suction pressure.
Example:
Published freeze cycle time: 19.1 - 21.7 minutes
Published freeze cycle suction pressure: 20 - 3 psig
2B. Compare the published freeze cycle time and
published freeze cycle suction pressure. Develop a chart.
Example:
Published Freeze Cycle Time (minutes)
1
5
10
15
20
|
|
|
|
|
20
16
12
8
3
Published Freeze Cycle Suction Pressure (psig)
In the example, the proper suction pressure should be
approximately 16 psig at 5 minutes; 12 psig at 10
minutes; etc.
3. Perform an actual suction pressure check at the
beginning, middle and end of the freeze cycle. Note the
times at which the readings are taken.
Example:
Manifold gauges were connected to the example ice
machine and suction pressure readings taken as
follows: ________ psig
Beginning of Freeze cycle: 30 (at 1 min.)
Middle of freeze cycle: 22 (at 10 min.)
End of freeze cycle: 8 (at 20 min.)
4. Compare the actual freeze cycle suction pressure (step
3) to the published freeze cycle time and pressure
comparison (step 2B). Determine if the suction pressure is
high, low or acceptable.
Example:
In this example, the suction pressure is considered high
throughout the freeze cycle. It should have been:
Approximately 20 psig (at 1 minute) – not 30
Approximately 12 psig (at 10 minutes) – not 22
Approximately 3 psig (at 20 minutes) – not 8
152
Part Number 80-01111-9 7/10
Suction Pressure High Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Discharge Pressure
• Discharge pressure is too high, and is affecting
suction pressure, refer to “Discharge Pressure
High Checklist” on page 150.
Improper Refrigerant Charge
• Overcharged
• Wrong type of refrigerant
• Non-condensables in system
Other
• Non-Manitowoc components in system
• Hot gas valve leaking
• Defective compressor
• Water inlet valve leaking
Suction Pressure Low Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Discharge Pressure
• Discharge pressure is too low, and is affecting
suction pressure, refer to “Freeze Cycle Discharge
Pressure Low Checklist” on page 150.
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Part Number 80-01111-9 7/10
153
Other
• Non-Manitowoc components in system
• Improper water supply over evaporator refer to
“Water System Checklist” on page 105.
• Loss of heat transfer from tubing on back side of
evaporator
• Restricted/plugged liquid line drier
• Restricted/plugged tubing in suction side of
refrigeration system
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.
HOT GAS VALVE
General
The hot gas valve is an electrically operated valve that
opens when energized, and closes when deenergized.
Normal Operation
The valve is de-energized (closed) during the freeze
cycle and energized (open) during the harvest cycle.
The valve is positioned between the receiver and the
evaporator and performs two functions:
1. Prevents refrigerant from entering the evaporator
during the freeze cycle.
The hot gas valve is not used during the freeze
cycle. The hot gas valve is de-energized (closed)
preventing refrigerant flow from the receiver into
the evaporator.
2. Allows refrigerant vapor to enter the evaporator in
the harvest cycle.
During the harvest cycle, the hot gas valve is
energized (open) allowing refrigerant gas from the
discharge line of the compressor to flow into the
evaporator. The heat is absorbed by the
evaporator and allows release of the ice slab.
Exact pressures vary according to ambient
temperature. Harvest pressures can be found in the
“Cycle Time/24 Hour Ice Production/Refrigerant
Pressure Charts” in this book.
154
Part Number 80-01111-9 7/10
Hot Gas Valve Analysis
The valve can fail in two positions:
• Valve will not open in the harvest cycle.
• Valve remains open during the freeze cycle.
Valve Will Not Open in the Harvest Cycle
Although the circuit board has initiated a harvest cycle,
the evaporator temperature remains unchanged from
the freeze cycle.
Valve Remains Open in the Freeze Cycle
Symptoms are dependent on the amount of leakage in
the freeze cycle. A small amount of leakage will cause
increased freeze cycle times. A large amount of
leakage will result in no ice produced.
Use the following procedure and table to help
determine if a hot gas valve is remaining partially open
during the freeze cycle.
1. Wait five minutes into the freeze cycle.
2. Feel the inlet of the hot gas valve(s).
Important
Feeling the hot g as valve outlet or across the hot
gas va lve itself wi ll n ot work for this comp arison.
The h ot g as val ve o utlet i s on the suction sid e
(cool refrigerant). It may be cool enough to touch
even if the valve is leaking.
3. Feel the compressor discharge line.
! Warning
The inlet of the hot gas valve and the compressor
discharge line could be h ot e nough to bu rn your
hand. Just touch them momentarily.
4. Compare the temperature of the inlet of the hot
gas valves to the temperature of the compressor
discharge line.
Part Number 80-01111-9 7/10
155
Findings
Comments
The inlet of the harvest
valve is cool enough to
touch and the compressor
discharge line is hot.
This is normal as the
discharge line should
always be too hot to touch
and the harvest valve inlet,
although too hot to touch
during harvest, should be
cool enough to touch after 5
minutes into the freeze
cycle.
Cool & Hot
The inlet of the harvest
valve is hot and approaches
the temperature of a hot
compressor discharge line.
Hot & Hot
Both the inlet of the harvest
valve and the compressor
discharge line are cool
enough to touch.
Cool & Cool
This is an indication
something is wrong, as the
harvest valve inlet did not
cool down during the freeze
cycle. If the compressor
dome is also entirely hot,
the problem is not a harvest
valve leaking, but rather
something causing the
compressor (and the entire
ice machine) to get hot.
This is an indication
something is wrong, causing
the compressor discharge
line to be cool to the touch.
This is not caused by a
harvest valve leaking.
5. Record your findings on the table.
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Part Number 80-01111-9 7/10
Ice Production Check
The amount of ice a machine produces directly relates
to the operating water and air temperatures. This
means an ice machine with a 70°F (21.2°C) ambient
temperature and 50°F (10.0°C) water produces more
ice than the same ice machine with 90°F (32.2°C)
ambient and 70°F (21.2°C) water.
1. Determine the ice machine operating conditions:
Air temp entering condenser: ____
Air temp around ice machine: ____
Water temp entering sump trough: ____
2. Refer to the appropriate 24-Hour Ice Production
Chart. Use the operating conditions determined in
Step 1 to find published 24 hr. ice production:____
Times are in minutes.
Example: 1 min., 15 sec. converts to 1.25 min.
(15 seconds  60 seconds = .25 minutes)
Weights are in pounds.
Example: 2 lb., 6 oz. converts to 2.375 lb.
(6 oz. 16 oz. = .375 lb.)
3. Perform an ice production check using the
formula below.
1. _______
+
Freeze Time
2. 1440

Mins in 24 hrs
3. _______
Weight of One
Harvest
_______
=
Harvest Time
_______
=
Total Cycle Time
x
_______
Cycles Per Day
_______
Total Cycle Time
_______
Cycles Per Day
=
_______
Actual 24 Hr
Production
4. Compare the results of Step 3 with Step 2. Ice
production is normal when these numbers match
closely. If they match closely, determine if:
Another larger ice machine is required.
Relocating the existing equipment to lower the
load conditions is required.
Part Number 80-01111-9 7/10
157
ADJUSTING CUBE WEIGHT
The cube weight can be increased from the factory
setting by adjusting the finish time.
ADDITIONAL FINISHING TIME CHECK
Press and hold the power button for 5 seconds.
• Count the flashes on the Automatic Ice Making
light. The light will flash once for each additional
minute of freeze cycle time.
ADJUSTING FINISHING TIME
Adjust in 1-minute increments and allow the ice
machine to run several freeze/harvest cycles, and
then inspect the ice cubes. If a heavier cube weight is
desired add another minute of freeze time and repeat
the process.
Press and hold the power button.
• Press and release the clean button once for each
additional minute of freeze cycle time desired.
Five minutes is the maximum additional freeze time
that can be added. Pressing the clean button 6 times
will reset the finishing time to zero additional minutes.
158
Part Number 80-01111-9 7/10
Component Check Procedures
Main Fuse
FUNCTION
The control board fuse stops ice machine operation if
electrical components fail causing high amp draw.
SPECIFICATIONS
• QM20/QM30
The main fuse is 250 Volt, 8 amp.
• QM45/SM50/Q130/Q170/Q210/Q270
The main fuse is 250 Volt, 10 amp.
! Warning
High (line) voltage is applied to the control b oard
at all ti mes. R emoving th e con trol boa rd fuse or
moving the to ggle sw itch to OFF wil l not remove
the power supplied to the control board.
CHECK PROCEDURE
1. If the bin switch light is on with the ice damper
closed, the fuse is good.
! Warning
Disconnect electrical power to the e
machine before proceeding.
ntire ice
2. Remove the fuse. Check the resistance across
the fuse with an ohmmeter.
Reading
Result
Open (OL)
Replace fuse
Closed (O)
Fuse is good
Part Number 80-01111-9 7/10
159
Bin Switch
QM45/Q130/Q170/Q210/Q270
Function
Bin switch operation is controlled by the movement of
the ice damper. The bin switch has two main functions:
1. Terminating the harvest cycle and returning the
ice machine to the freeze cycle.
This occurs when the bin switch is opened and
closed again within 7 seconds of opening during
the harvest cycle.
2.
Automatic ice machine shut-off.
If the storage bin is full at the end of a harvest
cycle, the sheet of cubes fails to clear the ice
damper and holds it down. After the ice damper is
held down for 7 seconds, the ice machine shuts
off.
The ice machine remains off until enough ice is
removed from the storage bin to allow the sheet of
cubes to drop clear of the ice damper. As the ice
damper swings back to the operating position, the
bin switch closes and the ice machine restarts.
Important
The ice damper must be up (bin switch closed) to
start ice making.
Check Procedure
1. Set the toggle switch to OFF.
2. Watch the bin switch light on the control board.
3. Move the ice damper upward, toward the
evaporator. The bin switch must close. The bin
switch light “on” indicates the bin switch has
closed properly.
4. Move the ice damper away from the evaporator.
The bin switch must open. The bin switch light
“off” indicates the bin switch has opened properly.
160
Part Number 80-01111-9 7/10
Ohm Test
1. Disconnect the bin switch wires to isolate the bin
switch from the control board.
2. Connect an ohmmeter to the disconnected bin
switch wires.
3. Cycle the bin switch open and closed numerous
times by opening and closing the water curtain.
NOTE: To prevent misdiagnosis:
• Always use the water curtain magnet to cycle the
switch (a larger or smaller magnet will affect switch
operation).
• Watch for consistent readings when the bin switch
is cycled open and closed (bin switch failure could
be erratic).
Part Number 80-01111-9 7/10
161
Bin Switch Removal — QM45/Q130
1. Disconnect power to the ice machine at service
disconnect.
2. Disconnect bin switch wires in control box.
3. Depress tab on right side of evaporator with
thumb.
4. Slide bin switch to right to remove.
5. Pull wiring into evaporator compartment.
BIN SWITCH
TAB
SV1731H
Bin Switch Removal
162
Part Number 80-01111-9 7/10
Bin Switch Removal — Q170/Q210/Q270
1. Disconnect power to the ice machine at service
disconnect.
2. Disconnect bin switch wires in control box.
3. Insert a small screwdriver through the hole
located in the top of the bin switch, and depress
mounting tab slightly.
4. While depressing mounting tab roll bin switch to
right to release.
5. Pull wiring into evaporator compartment.
INSERT
SCREWDRIVER AND
DEPRESS TAB
BIN SWITCH
SV1695B
Bin Switch Removal
Part Number 80-01111-9 7/10
163
Bin Thermostat
QM20/QM30
Function
The bin thermostat stops the ice machine when the bin
is full.
The level of ice in the ice storage bin controls the ice
machine shut-off. When the bin is full, ice cubes
contact the bin thermostat bulb holder, which cools
down and opens the bin thermostat to stop the ice
machine. The ice machine remains off until enough ice
has been removed from the bin. This causes the
thermostat bulb holder to warm and closes the bin
thermostat, restarting the ice machine.
Specifications
Control
Setting
Bin Thermostat
Cut in: 40°F (4.5°C)
Cut out: 34°F (1.0°C)
Check Procedure
! Warning
High (line) voltage is appl ied to the control bo ard
(terminals #8 an d #2) at all times. Re moving the
control board fuse or moving the toggle switch to
OFF will not remo ve the power supplied to the
control board.
! Warning
Disconnect electrical pow er to th e entire ice
machine before proceeding.
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Part Number 80-01111-9 7/10
1. Remove the back panel to access the bin
thermostat.
2. Disconnect both wires #12 and #1 from the bin
thermostat and check the resistance across the
bin thermostat terminals.
No Ice on Bulb
Ice on Bulb
Result
Closed (O)
Open (OL)
Thermostat good
Open (OL)
Closed (O)
Replace
thermostat
NOTE: After covering/uncovering the bulb holder with
ice, wait at least three minutes to allow the thermostat
to react. (Open/Close)
DECREASE
LEVEL OF
ICE IN BIN
WARMER
4"
(10.2 CM)
COOLER
INCREASE
LEVEL OF
ICE IN BIN
1.5"
(3.8 CM)
SV1680B
Part Number 80-01111-9 7/10
165
SM50
Function
The bin thermostat stops the ice machine when the bin
is full. It is preset for normal ambient temperatures and
adjustments are usually not required.
The level of ice in the ice storage bin controls the ice
machine shut-off. When the bin is full, ice cubes
contact the bin thermostat bulb holder, which cools
down and opens the bin thermostat to stop the ice
machine. The ice machine remains off until enough ice
has been removed from the bin. This causes the
thermostat bulb holder to warm and closes the bin
thermostat, restarting the ice machine.
The thermostat is functioning correctly if, when three
ice cubes are placed on the thermostat tube for 5
minutes, the ice machine stops. The ice machine
should restart 5 minutes after the cubes are removed.
Specifications
Control
Setting
Bin Thermostat
Cut in: 40°F (4.5°C)
Cut out: 34°F (1.0°C)
BIN THERMOSTAT
TUBE LOCATION
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Part Number 80-01111-9 7/10
Adjusting
If the ice machine stops before the bin is full or runs
after the bin is full, ambient temperatures are probably
high or low and the bin thermostat can be adjusted as
follows:
! Warning
HAZARDOUS MOVING PARTS
Power i s suppl ied to ice machi ne d uring th is
procedure. Avoid contact with the fan blade and
the electrical connections.
1. To access the thermostat, remove the two screws
attaching the front grill and remove the grill.
2. Remove the lower white plastic panel by pulling
straight down.
BIN THERMOSTAT
3. Turn the thermostat to the left to decrease the
level of ice before automatic shut-off. Turn to the
right to increase the level of ice before automatic
shut-off.
4. Reassemble the plastic panel and grill.
Part Number 80-01111-9 7/10
167
Check Procedure
! Warning
High (line) voltage is appl ied to the control bo ard
(terminals #2 0 and #21) at al l ti mes. Remo ving
the control bo ard fuse or dep ressing the power
button will n ot re move the p ower supplied to the
control board.
! Warning
Disconnect electrical pow er to th e entire ice
machine before proceeding.
1. Verify the capillary tube is inserted correctly in the
bulb holder (17"/43 cm).
2. Remove the 2 bottom front panels to access the
bin thermostat.
3. Disconnect wires #45 and #46 from the bin
thermostat or control board and check the
resistance across the bin thermostat terminals.
No Ice on Bulb
Ice on Bulb
Result
Closed (O)
Open (OL)
Thermostat good
Open (OL)
Closed (O)
Replace
thermostat
NOTE: After covering/uncovering the bulb holder with
ice, wait at least three minutes to allow the thermostat
to react. (Open/Close)
168
Part Number 80-01111-9 7/10
Liquid Line Thermistor
QM20/QM30/SM50
Function
The liquid line thermistor senses the refrigeration system
liquid line temperature. This is used in conjunction with the
control board to determine the length of the freeze and
harvest cycles.
Specifications
10,000 Ohms  2% at 25°C (77°F)
! Caution
Use only Manitowoc thermistors.
Check Procedure
Thermistors generally fail because of moisture or physical
damage. Manitowoc liquid line thermistors are encased in a
specially designed, moisture-sealed aluminum block. This
eliminates physical damage and moisture concerns.
Verify that the thermistor resistance is accurate and
corresponds to the high and low temperature ranges.
1. Disconnect the thermistor at the control board. Connect
the ohmmeter to the isolated thermistor wire leads.
2. Using a temperature meter capable of taking readings
on curved copper lines, attach the temperature metersensing device to the liquid line next to the thermistor
aluminum block.
Important
Do n ot simply “in sert” the sensing devi ce und er
the insulation. It must b e attached to and reading
the actual temperature of the copper liquid line.
3. With the ice machine running, verify that the
temperature of the discharge line (step 2) corresponds
to the thermistor resistance reading (step 1) as stated in
the temperature/resistant chart.
Important
If the thermistor would fail closed, the light on the
control board will flash rapidly.
If th e thermistor woul d fail open , the ligh t on the
control board will flash slowly.
Part Number 80-01111-9 7/10
169
Temperature/Resistance Chart
As the temperature rises at the thermistor block, the
resistance drops.
Important
If the ohmmeter read s “OL,” check the sca le
setting o n the
meter before
assuming the
thermistor is bad.
Temperature of Thermistor
Resistance
°C
°F
K Ohms (x 1000)
15.6° - 21.1°
60° - 70°
15.31 - 11.88
21.1° - 26.7°
70° - 80°
11.88 - 9.29
26.7° - 32.2°
80° - 90°
9.29 - 7.33
32.2° - 37.8°
90° - 100°
7.33 - 5.82
37.8° - 43.3°
100° - 110°
5.82 - 4.66
43.3° - 48.9°
110° - 120°
4.66 - 3.75
48.9° - 54.4°
120° - 130°
3.75 - 3.05
54.4° - 60.0°
130° - 140°
3.05 - 2.49
60.0° - 65.6°
140° - 150°
2.49 - 2.04
65.6° - 71.1°
150° - 160°
2.04 - 1.68
71.1° - 76.7°
160° - 170°
1.68 - 1.40
76.7° - 82.2°
170° - 180°
1.40 - 1.17
82.2° - 87.8°
180° - 190°
1.17 - 0.98
87.8° - 93.3°
190° - 200°
0.98 - 0.82
93.3° - 98.9°
200° - 210°
0.82 - 0.70
100°
212°
0.73 - 0.62
(boiling water bath)
104.4° - 110.0°
220° - 230°
110.0° - 115.6°
230° - 240°
0.51 - 0.43
115.6° - 121.1°
240° - 250°
0.43 - 0.37
121.1° - 126.7°
250° - 260°
0.37 - 0.33
170
0.59 - 0.51
Part Number 80-01111-9 7/10
Diagnosing Start Components
If the compressor attempts to start, or hums and trips
the overload protector, check the start components
before replacing the compressor.
CAPACITOR
Visual evidence of capacitor failure can include a
bulged terminal end or a ruptured membrane. Do not
assume a capacitor is good if no visual evidence is
present. A good test is to install a known good
substitute capacitor. Use a capacitor tester when
checking a suspect capacitor. Clip the bleed resistor
off the capacitor terminals before testing.
RELAY
The relay has a set of contacts that connect and
disconnect the start capacitor from the compressor
start winding. The contacts on the relay are normally
open. The relay senses the voltage generated by the
start winding and closes and then opens the contacts
as the compressor motor starts. The contacts remain
open until the compressor is de-energized.
Part Number 80-01111-9 7/10
171
ON/OFF/WASH Toggle Switch
FUNCTION
The switch is used to place the ice machine in ON,
OFF or WASH mode of operation.
SPECIFICATIONS
Single-pole, double-throw switch. The switch is
connected into a varying low D.C. voltage circuit.
CHECK PROCEDURE
NOTE: Because of a wide variation in D.C. voltage, it
is not recommended that a voltmeter be used to check
toggle switch operation.
1. Inspect the toggle switch for correct wiring.
2. Isolate the toggle switch by disconnecting all
wires from the switch, or by disconnecting the
Molex connector from the control board.
3. Check across the toggle switch terminals using a
calibrated ohmmeter. Note where the wire
numbers are connected to the switch terminals, or
refer to the wiring diagram to take proper
readings.
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Part Number 80-01111-9 7/10
QM45/Q130/Q170/Q210/Q270
Switch Setting
ON
WASH
OFF
Terminals
Ohm Reading
24-21
Open
24-20
Closed
20-21
Open
24-20
Open
24-21
Closed
20-21
Open
24-20
Open
24-21
Open
20-21
Open
Replace the toggle switch if ohm readings do not
match all three-switch settings.
QM20/QM30
Switch Setting
Terminals
7-4
Open
ON
7-12
Closed
12-4
Open
7-12
Open
7-4
Closed
12-4
Open
WASH
OFF
Ohm Reading
7-12
Open
7-4
Open
12-4
Open
Replace the toggle switch if ohm readings do not
match all three-switch settings.
Part Number 80-01111-9 7/10
173
Ice Thickness Probe
QM45/Q130/Q170/Q210/Q270
How The Probe Works
Manitowoc’s electronic sensing circuit does not rely on
refrigerant pressure, evaporator temperature, water
levels or timers to produce consistent ice formation.
As ice forms on the evaporator, water (not ice)
contacts the ice thickness probe. After the water
completes this circuit across the probe continuously
for 6-10 seconds, a harvest cycle is initiated.
Freeze Time Lock-In Feature
The ice machine control system incorporates a freeze
time lock-in feature. This prevents the ice machine
from short cycling in and out of harvest.
The control board locks the ice machine in the freeze
cycle for six minutes. If water contacts the ice
thickness probe during these six minutes, the harvest
light will come on (to indicate that water is in contact
with the probe), but the ice machine will stay in the
freeze cycle. After the six minutes are up, a harvest
cycle is initiated. This is important to remember when
performing diagnostic procedures on the ice thickness
control circuitry.
To allow the service technician to initiate a harvest
cycle without delay, this feature is not used on the first
cycle after moving the toggle switch OFF and back to
ON.
Maximum Freeze Time
The control system includes a built-in safety, which will
automatically cycle the ice machine into harvest after
60 minutes in the freeze cycle.
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Part Number 80-01111-9 7/10
ICE THICKNESS CHECK
The ice thickness probe is factory-set to maintain the
ice bridge thickness at 1/8" (3.2 mm).
NOTE: Make sure the water curtain is in place when
performing this check. It prevents water from splashing
out of the water trough.
1. Inspect the bridge connecting the cubes. It should
be about 1/8" (3.2 mm) thick.
2. If adjustment is necessary, turn the ice thickness
probe adjustment screw clockwise to increase
bridge thickness, or counterclockwise to decrease
bridge thickness.
NOTE: Turning the adjustment 1/3 of a turn will
change the ice thickness about 1/16" (1.5 mm).
ADJUSTING
SCREW
1/8" ICE BRIDGE
THICKNESS
SV3114
SV3113
Ice Thickness Check
Make sure the ice thickness probe wire and the
bracket do not restrict movement of the probe.
Part Number 80-01111-9 7/10
175
Compressor Electrical Diagnostics
The compressor does not start or will trip repeatedly
on overload.
CHECK RESISTANCE (OHM) VALUES
NOTE: Compressor windings can have very low ohm
values. Use a properly calibrated meter.
Perform the resistance test after the compressor
cools. The compressor dome should be cool enough
to touch (below 120°F/49°C) to ensure that the
overload is closed and the resistance readings will be
accurate.
SINGLE PHASE COMPRESSORS
1. Disconnect power from the condensing unit and
remove the wires from the compressor terminals.
2. The resistance values between C and S and
between C and R, when added together should
equal the resistance value between S and R.
3. If the overload is open, there will be a resistance
reading between S and R, and open readings
between C and S and between C and R. Allow the
compressor to cool, then check the readings
again.
CHECK MOTOR WINDINGS TO GROUND
Check continuity between all three terminals and the
compressor shell or copper refrigeration line. Scrape
metal surface to get good contact. If continuity is
present, the compressor windings are grounded and
the compressor should be replaced.
To determine if the compressor is seized check the
amp draw while the compressor is trying to start.
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Part Number 80-01111-9 7/10
COMPRESSOR DRAWING LOCKED ROTOR
The two likely causes of this are:
• Defective starting component
• Mechanically seized compressor
To determine which you have:
1. Install high and low side gauges.
2. Try to start the compressor.
3. Watch the pressures closely.
• If the pressures do not move, the compressor
is seized. Replace the compressor.
• If the pressures move, the compressor is
turning slowly and is not seized. Check the
capacitors and relay.
COMPRESSOR DRAWING HIGH AMPS
The continuous amperage draw on start-up should not
be near the maximum fuse size indicated on the serial
tag.
The wiring must be correctly sized to minimize voltage
drop at compressor start-up. The voltage when the
compressor is trying to start must be within 10% of
the nameplate voltage.
Part Number 80-01111-9 7/10
177
Fan Cycle Control
QM45/Q130/Q170/Q210/Q270
Function
Cycles the fan motor on and off to maintain proper
operating discharge pressure.
The fan cycle control closes on an increase, and
opens on a decrease in discharge pressure.
Specifications
Model
Cut-In
(Close)
Cut-Out
(Open)
QM45
145 psig 5
110 psig 5
Q130
250 psig 5
200 psig 5
Q170
275 psig 5
225 psig 5
Q210
275 psig 5
225 psig 5
Q270
250 psig 5
200 psig 5
Check Procedure
Disconnect electrical power to the ice machine at the
electrical service disconnect.
Verify fan motor windings are not open or grounded,
and fan spins freely.
Connect manifold gauges to ice machine.
Hook voltmeter in parallel across the fan cycle control,
leaving wires attached.
Reconnect electrical power to the ice machine and set
the ON/OFF/WASH toggle switch to ON.
Wait until water flows over the evaporator then refer to
chart below.
System
Pressure:
178
Reading
Should Be:
Fan Should
Be:
above cut-in
0 volts
running
below cut-out
line voltage
off
Part Number 80-01111-9 7/10
High Pressure Cutout (HPCO) Control
QM45/Q130/Q170/Q210/Q270
Function
Stops the ice machine if subjected to excessive highside pressure.
The HPCO control is normally closed, and opens on a
rise in discharge pressure.
Specifications
Cut-out: 450 psig 10
Cut-in:
Automatic reset
(Must be below 300 psig to reset).
Check Procedure
1. Set ON/OFF/WASH switch to OFF.
2. Connect manifold gauges.
3. Hook voltmeter in parallel across the HPCO,
leaving wires attached.
4. On water-cooled models, close the water service
valve to the water condenser inlet. On selfcontained air-cooled models, disconnect the fan
motor.
5. Set ON/OFF/WASH switch to ON.
6. No water or air flowing through the condenser will
cause the HPCO control to open because of
excessive pressure. Watch the pressure gauge
and record the cut-out pressure.
! Warning
If discha rge pressu re exceeds 46 0 p sig an d th e
HPCO cont rol does not cut out, set ON/O FF/
WASH switch to OFF to stop ice
machine
operation.
Replace the HPCO control if it:
• Will not reset (below 300 psig)
• Does not open at the specified cut-out point
Part Number 80-01111-9 7/10
179
Filter-Driers
LIQUID LINE FILTER DRIER
The filter-drier used on Manitowoc ice machines are
manufactured to Manitowoc specifications.
The difference between a Manitowoc drier and an offthe-shelf drier is in filtration. A Manitowoc drier has
dirt-retaining filtration, with fiberglass filters on both the
inlet and outlet ends. This is very important because
ice machines have a back-flushing action that takes
place during every harvest cycle.
A Manitowoc filter-drier has a very high moisture
removal capability and a good acid removal capacity.
Important
The liquid line drier is covered as a warranty part.
The liquid line drier must be replaced any time the
system is opened for repair.
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Part Number 80-01111-9 7/10
Refrigerant Recovery/Evacuation
DEFINITIONS
Recover
To remove refrigerant, in any condition, from a system
and store it in an external container, without
necessarily testing or processing it in any way.
Recycle
To clean refrigerant for re-use by oil separation and
single or multiple passes through devices, such as
replaceable core filter-driers, which reduce moisture,
acidity and particulate matter. This term usually
applies to procedures implemented at the field job site
or at a local service shop.
Reclaim
To reprocess refrigerant to new product specifications
(see below) by means which may include distillation. A
chemical analysis of the refrigerant is required after
processing to be sure that product specifications are
met. This term usually implies the use of processes
and procedures available only at a reprocessing or
manufacturing facility.
Chemical analysis is the key requirement in this
definition. Regardless of the purity levels reached by a
reprocessing method, refrigerant is not considered
“reclaimed” unless it has been chemically analyzed
and meets ARI Standard 700 (latest edition).
New Product Specifications
This means ARI Standard 700 (latest edition).
Chemical analysis is required to assure that this
standard is met.
Part Number 80-01111-9 7/10
181
REFRIGERANT RE-USE POLICY
Manitowoc recognizes and supports the need for
proper handling, re-use, and disposal of CFC and
HCFC refrigerants. Manitowoc service procedures
require recapturing refrigerants, not venting them to
the atmosphere.
It is not necessary, in or out of warranty, to reduce or
compromise the quality and reliability of your
customers’ products to achieve this.
Important
Manitowoc Ice assumes no respon sibility for
use of con taminated refrigerant. Da mage
resulting from the
use of co ntaminated,
recovered, or recycled refrigerant is the sole
responsibility of the servicing company.
Manitowoc approves the use of:
1. New Refrigerant
• Must be of original nameplate type.
2. Reclaimed Refrigerant
• Must be of original nameplate type.
• Must meet ARI Standard 700 (latest edition)
specifications.
3. Recovered or Recycled Refrigerant
• Must be recovered or recycled in accordance
with current local, state and federal laws.
• Must be recovered from and re-used in the
same Manitowoc product. Re-use of recovered
or recycled refrigerant from other products is
not approved.
• Recycling equipment must be certified to ARI
Standard 740 (latest edition) and be
maintained to consistently meet this standard.
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Part Number 80-01111-9 7/10
4. Recovered refrigerant must come from a
“contaminant-free” system. To decide whether the
system is contaminant free, consider:
• Type(s) of previous failure(s)
• Whether the system was cleaned, evacuated
and recharged properly following failure(s)
• Whether the system has been contaminated
by this failure
• Compressor motor burnouts and improper past
service prevent refrigerant re-use.
• Refer to “System Contamination Cleanup” on
page 190 to test for contamination.
5. “Substitute” or “Alternative” Refrigerant
• Must use only Manitowoc-approved alternative
refrigerants.
• Must follow Manitowoc-published conversion
procedures.
Part Number 80-01111-9 7/10
183
RECOVERY AND RECHARGING PROCEDURES
Q130/Q170/Q210/Q270
Do not purge refrigerant to the atmosphere. Capture
refrigerant using recovery equipment. Follow the
manufacturer’s recommendations.
Important
Manitowoc Ice assumes no responsibility for the
use of
contaminated refrige rant. Damag e
resulting from the use of contaminated refrigerant
is the sole responsibility of the servicing company.
Important
Replace the liq uid line drie r before e vacuating
and recharging. Use only a Man itowoc (O.E.M.)
liquid line filter dri er to pre vent void ing the
warranty.
CONNECTIONS
1. Suction side of the compressor through the
suction service valve.
2. Discharge side of the compressor through the
discharge service valve.
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Part Number 80-01111-9 7/10
SELF-CONTAINED RECOVERY/EVACUATION
1. Place the toggle switch in the OFF position.
2. Install manifold gauges, charging cylinder/scale,
and recovery unit or two-stage vacuum pump.
3. Open (backseat) the high and low side ice
machine service valves, and open high and low
side on manifold gauges.
4. Perform recovery or evacuation:
A. Recovery: Operate the recovery unit as
directed by the manufacturer’s instructions.
B. Evacuation prior to recharging: Pull the
system down to 500 microns. Then, allow the
pump to run for an additional half hour. Turn
off the pump and perform a standing vacuum
leak check.
NOTE: Check for leaks using a halide or electronic
leak detector after charging the ice machine.
Follow the Charging Procedures below.
CHARGING PROCEDURES
Important
The cha rge i s criti cal o n a ll Man itowoc i ce
machines. Use a scale or a charg ing cylin der to
ensure the proper charge is installed.
1. Be sure the toggle switch is in the OFF position.
2. Close the vacuum pump valve, the low side
service valve, and the low side manifold gauge
valve.
3. Open the high side manifold gauge valve, and
backseat the high side service valve.
4. Open the charging cylinder and add the proper
refrigerant charge (shown on nameplate) through
the discharge service valve.
5. Let the system “settle” for 2 to 3 minutes.
6. Place the toggle switch in the ICE position.
7. Close the high side on the manifold gauge set.
Add any remaining vapor charge through the
suction service valve (if necessary).
Part Number 80-01111-9 7/10
185
NOTE: Manifold gauges must be removed properly to
ensure that no refrigerant contamination or loss
occurs.
8. Make sure that all of the vapor in the charging
hoses is drawn into the ice machine before
disconnecting the charging hoses.
A. Run the ice machine in freeze cycle.
B. Close the high side service valve at the ice
machine.
C. Open the low side service valve at the ice
machine (when supplied) or disconnect the
low loss fitting from the access valve.
D. Open the high and low side valves on the
manifold gauge set. Any refrigerant in the
lines will be pulled into the low side of the
system.
E. Allow the pressures to equalize while the ice
machine is in the freeze cycle.
F. Close the low side service valve at the ice
machine.
9. Remove the hoses from the ice machine and
install the caps.
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Part Number 80-01111-9 7/10
QM20/QM30/QM45
Do not purge refrigerant to the atmosphere. Capture
refrigerant using recovery equipment. Follow the
manufacturer’s recommendations.
Important
Manitowoc Ice assumes no responsibility for the
use of
contaminated refrige rant. Damag e
resulting from the use of contaminated refrigerant
is the sole responsibility of the servicing company.
Important
Replace the liq uid line drie r before e vacuating
and recharging. Use onl y a Man itowoc (O.E.M.)
liquid lin e filter drier to preven t voidi ng th e
warranty.
CONNECTIONS
The QM series ice machines are critically charged.
There are no refrigerant access ports on QM series ice
machines.
1. Locate the high and low side process tubes.
2. Install a piercing valve (saddle valve) on both the
high and low side process tubes.
Important
Remove piercing va lves af ter charg ing. Un it is
critically charged.
Important
Purge system wi th nitroge n wh ile brazing to
prevent build u p of co pper oxide in
the
refrigeration system.
Part Number 80-01111-9 7/10
187
Important
Manifold gau ges must be re moved pro perly to
ensure th at n o refri gerant con tamination or loss
occurs. A quick disconnect is required for the high
side connection u nless high sid e val ve ha s shut
off.
RECOVERY/EVACUATION
1. Place the toggle switch in the OFF position.
2. Install manifold gauges, charging scale, and
recovery unit or two-stage vacuum pump.
3. Open the high and low side valves on manifold
gauges.
4. Perform recovery or evacuation:
A. Recovery: Operate the recovery unit as
directed by the manufacturer’s instructions.
B. Evacuation prior to recharging: Pull the
system down to 500 microns. Then, allow the
pump to run for an additional half hour. Turn
off the pump and perform a standing vacuum
leak check.
NOTE: Check for leaks using a halide or electronic
leak detector after charging the ice machine.
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Part Number 80-01111-9 7/10
CHARGING PROCEDURES
Important
The cha rge i s criti cal o n a ll Man itowoc i ce
machines. Use a scale to e nsure the prop er
charge is installed. A quick disconnect is required
for the high side connection.
1. Be sure the toggle switch is in the OFF position.
2. Close the vacuum pump valve and the low side
manifold gauge valve.
3. Open the high side manifold gauge valve.
4. Open the refrigerant cylinder and add the proper
refrigerant charge (shown on nameplate) through
the discharge service valve.
5. Close the high side on the manifold gauge set.
Add any remaining vapor charge through the
suction access fitting (if necessary).
6. Let the system “settle” for 2 to 3 minutes.
7. Place the toggle switch in the ICE position.
NOTE: Manifold gauges must be removed properly to
ensure that no refrigerant contamination or loss
occurs.
8. Make sure that all of the vapor in the charging
hoses is drawn into the ice machine before
disconnecting the charging hoses.
A. Run the ice machine in the freeze cycle.
B. Verify the refrigerant cylinder valve is closed.
C. Open the high and low side valves on the
manifold gauge set. Any refrigerant in the
lines will be pulled into the low side of the
system.
D. Allow the pressures to equalize while the ice
machine is in the freeze cycle.
E. Close the high and low side manifold gauge
set.
F. Remove the hoses from the ice machine and
install the caps.
Part Number 80-01111-9 7/10
189
System Contamination Cleanup
GENERAL
This section describes the basic requirements for
restoring contaminated systems to reliable service.
Important
Manitowoc Ice assumes no responsibility for the
use of
contaminated refrige rant. Damag e
resulting from the use of contaminated refrigerant
is the sole responsibility of the servicing company.
DETERMINING SEVERITY OF CONTAMINATION
System contamination is generally caused by either
moisture or residue from compressor burnout entering
the refrigeration system.
Inspection of the refrigerant usually provides the first
indication of system contamination. Obvious moisture
or an acrid odor in the refrigerant indicates
contamination.
If either condition is found, or if contamination is
suspected, use a Total Test Kit from Totaline or a
similar diagnostic tool. These devices sample
refrigerant, eliminating the need to take an oil sample.
Follow the manufacturer’s directions.
If a refrigerant test kit indicates harmful levels of
contamination, or if a test kit is not available, inspect
the compressor oil.
1. Remove the refrigerant charge from the ice
machine.
2. Remove the compressor from the system.
3. Check the odor and appearance of the oil.
4. Inspect open suction and discharge lines at the
compressor for burnout deposits.
5. If no signs of contamination are present, perform
an acid oil test to determine the type of cleanup
required.
190
Part Number 80-01111-9 7/10
Contamination/Cleanup Chart
Symptoms/Findings
Required
Cleanup
Procedure
No symptoms or suspicion of
contamination
Normal
evacuation/
recharging
procedure
Moisture/Air Contamination symptoms
Refrigeration system open to
atmosphere for longer than 15 minutes
Refrigeration test kit and/or acid oil test
shows contamination
No burnout deposits in open
compressor lines
Mild
contamination
cleanup
procedure
Mild Compressor Burnout symptoms
Oil appears clean but smells acrid
Refrigeration test kit or acid oil test
shows harmful acid content
No burnout deposits in open
compressor lines
Mild
contamination
cleanup
procedure
Severe Compressor Burnout symptoms
Oil is discolored, acidic, and smells
acrid
Burnout deposits found in the
compressor, lines, and other
components
Severe
contamination
cleanup
procedure
Part Number 80-01111-9 7/10
191
MILD SYSTEM CONTAMINATION CLEANUP
PROCEDURE
1. Replace any failed components.
2. If the compressor is good, change the oil.
3. Replace the liquid line drier.
NOTE: If the contamination is from moisture, use heat
lamps during evacuation. Position them at the
compressor, condenser and evaporator prior to
evacuation. Do not position heat lamps too close to
plastic components, or they may melt or warp.
Important
Dry nitroge n is re commended fo r th is proce dure.
This will prevent CFC release.
4. Follow the normal evacuation procedure, except
replace the evacuation step with the following:
A. Pull vacuum to 1000 microns. Break the
vacuum with dry nitrogen and sweep the
system. Pressurize to a minimum of 5 psig.
B. Pull vacuum to 500 microns. Break the
vacuum with dry nitrogen and sweep the
system. Pressurize to a minimum of 5 psig.
C. Change the vacuum pump oil.
D. Pull vacuum to 500 microns. Run the vacuum
pump for 1/2 hour on self-contained models,
1 hour on remotes.
NOTE: You may perform a pressure test as a
preliminary leak check. You should use an electronic
leak detector after system charging to be sure there
are no leaks.
5. Charge the system with the proper refrigerant to
the nameplate charge.
6. Operate the ice machine.
192
Part Number 80-01111-9 7/10
SEVERE SYSTEM CONTAMINATION CLEANUP
PROCEDURE
1. Remove the refrigerant charge.
2. Remove the compressor.
3. Disassemble the hot gas solenoid valve. If burnout
deposits are found inside the valve, install a rebuild kit,
and replace the TXV and head pressure control valve.
4. Wipe away any burnout deposits from suction and
discharge lines at compressor.
5. Sweep through the open system with dry nitrogen.
Important
Refrigerant swee ps are not re commended, as
they release CFCs into the atmosphere. 
Dry nitroge n is re commended fo r th is proce dure.
This will prevent CFC release.
6.
7.
8.
9.
10.
11.
12.
13.
Install a new compressor and new start components.
Install suction line filter-drier in front of compressor.
Install a new liquid line drier.
Follow the normal evacuation procedure, except replace
the evacuation step with the following:
A. Pull vacuum to 1000 microns. Break the vacuum
with dry nitrogen and sweep the system.
Pressurize to a minimum of 5 psig.
B. Change the vacuum pump oil.
C. Pull vacuum to 500 microns. Break the vacuum
with dry nitrogen and sweep the system.
Pressurize to a minimum of 5 psig.
D. Change the vacuum pump oil.
E. Pull vacuum to 500 microns. Run the vacuum
pump for 1 additional hour.
Charge the system with the proper refrigerant to the
nameplate charge.
Operate the ice machine for one hour. Then, check the
pressure drop across the suction line filter-drier.
A. If the pressure drop is less than 2 psig, the filterdrier should be adequate for complete cleanup.
B. If the pressure drop exceeds 2 psig, change the
suction line filter-drier and the liquid line drier.
Repeat until the pressure drop is acceptable.
Operate the ice machine for 48 – 72 hours. Replace the
suction line and liquid line drier if necessary.
Follow normal evacuation procedures.
Part Number 80-01111-9 7/10
193
REPLACING PRESSURE CONTROLS WITHOUT
REMOVING REFRIGERANT CHARGE
This procedure reduces repair time and cost. Use it
when any of the following components require
replacement, and the refrigeration system is
operational and leak-free.
• Fan cycle control
• High pressure cut-out control
• High side access valve
• Low side access valve
Important
This is a required in-warranty repair procedure.
1. Disconnect power to the ice machine.
2. Follow all manufacturers’ instructions supplied
with the pinch-off tool. Position the pinch-off tool
around the tubing as far from the pressure control
as feasible. (See the figure on next page.) Clamp
down on the tubing until the pinch-off is complete.
! Warning
Do not unsolder a defective component. Cut it out
of the system. Do not remove th e p inch-off too l
until the new component is securely in place.
3. Cut the tubing of the defective component with a
small tubing cutter.
4. Solder the replacement component in place.
Allow the solder joint to cool.
5. Remove the pinch-off tool.
6. Re-round the tubing. Position the flattened tubing
in the proper hole in the pinch off tool. Tighten the
wing nuts until the block is tight and the tubing is
rounded.
NOTE: The pressure controls will operate normally
once the tubing is re-rounded. Tubing may not
re-round 100%.
194
Part Number 80-01111-9 7/10
FIG. A - “PINCHING OFF” TUBING
FIG. B - RE-ROUNDING TUBING
SV1406
Using Pinch Off Tool
Part Number 80-01111-9 7/10
195
Q270 Condenser Fan Motor Replacement
Access to remove, clean or replace the condenser fan/
motor can be obtained by performing the following:
1. Disconnect electrical power to the ice machine at
the electrical service disconnect.
2. Remove the screws that secure the condenser to
the cabinet and the base to the cabinet.
3. Slide the base forward until contact is made with
the stop screw (approximately 2.5" [6.3 cm]).
! Caution
Do not move base p ast the st op scre w, t ubing
damage could result.
4. Remove right hand screw securing condenser to
base.
5. Pivot condenser forward to obtain 5" (12.7 cm)
between the cabinet and condenser shroud. Take
care not to kink refrigeration tubing.
5" (12.7 CM)
CLEARANCE
AFTER
PIVOTING
CONDENSER
REMOVE SCREW AND
PIVOT CONDENSER TO
OBTAIN 5" (12.7 CM)
CLEARANCE BETWEEN
CABINET AND
CONDENSER SHROUD.
REMOVE THREE
SCREWS AND
PULL BASE
FORWARD TO
STOP SCREW.
2.5" (6.3 CM) TO
STOP SCREW
PT1295A
Accessing the Condenser Fan Motor
196
Part Number 80-01111-9 7/10
Brazing Procedures for Danfoss
Solenoid Valves
•
•
Danfoss stainless steel solenoid valves require a
slightly different brazing technique than brassbodied valves. 
Copper clad stainless steel does not require as
much flame contact as copper tubing. 
Apply heat to the copper tubing first then the
solenoid socket.
15% silver solder is recommended although silver
bearing solder in the 5% to 55% range can be
used.
1. Remove coil and verify direction of flow.
DIRECTION OF
FLOW ARROW
SV3069
2. Fit valve in place and align stem at the 12:00
position.
90°
90°
SV3070
3. Do not disassemble valve.
Part Number 80-01111-9 7/10
197
MAX. 1300°F
(700°C)
SV3071
4. Apply heat to copper tubing first and move flame
toward valve socket.
A. Heat copper tubing for approximately 10 to
15 seconds then direct the heat to the
solenoid socket.
B. Heat the solenoid socket for 2 to 5 seconds
and apply silver solder to joint.
C. Do not attempt to fill solenoid flange with
solder. Solder will draw into socket.
5. Install new liquid line drier.
6. Leak check joints by pressurizing system with
150 psig nitrogen.
7. Evacuate and re-charge system to nameplate
charge.
8. Reinstall coil (using a twisting motion) and attach
wiring.
SV3073
198
Part Number 80-01111-9 7/10
Component Specifications
Main Fuse
Volt
Amp
QM20/QM30
250
8
QM45/SM50/
Q130/Q170/Q210/Q270
250
10
Bin Switch
QM45/Q130/Q170/Q210/Q270
Bin switch operation is controlled by the movement of
the ice damper.
Bin Thermostat
QM20/QM30/SM50
Control
Setting
Bin Thermostat
Cut in: 40°F (4.5°C)
Cut out: 34°F (1.0°C)
ON/OFF/WASH Toggle Switch
Single-pole, double-throw switch. The switch is
connected into a varying low D.C. voltage circuit.
Fan Control Cycle
QM45/Q130/Q170/Q210/Q270
Model
Cut-in
(Close)
Cut-out
(Open)
QM45
145 psig 5
110 psig 5
Q130
250 psig 5
200 psig 5
Q170
275 psig 5
225 psig 5
Q210
275 psig 5
225 psig 5
Q270
250 psig 5
200 psig 5
Part Number 80-01111-9 7/10
199
High Pressure Cutout (HPCO) Control
Cut-out
Cut-in
450 psig ±10
(3103 kPa ±69)
31 bar ±.69
Automatic Reset
Must be below 300 psig
(2068 kPa, 20.68 bar) to reset.
Filter-Driers
Drier with dirt-retaining filtration.
Liquid Line Thermistor
QM20/QM30/SM50
10,000 Ohms ± 2% at 25°C (77°F)
! Caution
Use only Manitowoc thermistors.
200
Part Number 80-01111-9 7/10
Total System Refrigerant Charge
Important
This information is for reference only. Refer to the
ice machine serial number tag to verify the system
charge. Se rial p late in formation overrid es
information listed on this page.
Model
AirCooled
WaterCooled
Refrigerant
Type
QM20
4.6 oz
(130 g)
NA
R134A
QM30
5.8 oz
(165 g)
NA
R134A
QM45
8 oz
(227 g)
NA
R134A
Q130 Tecumseh
Compressor
11 oz
(312 g)
11 oz
(312 g)
R404A
Q130
Danfoss
Compressor
Before Serial
Number
310047287
8 oz
(227 g)
11 oz
(312 g)
R404A
Q130
Danfoss
Compressor
After Serial
Number
310047287
10 oz
(290 g)
12 oz
(340 g)
R404A
Q170
14 oz
(397 g)
NA
R404A
Q210
15 oz
(425 g)
11 oz
(312 g)
R404A
Q270 Tecumseh
Compressor
17 oz
(482 g)
16 oz
(454 g)
R404A
Q270 Danfoss
Compressor
22 oz
(624 g)
16 oz
(454 g)
R404A
SM50
5.6 oz
NA
R134A
Part Number 80-01111-9 7/10
201
This Page Intentionally Left Blank
202
Part Number 80-01111-9 7/10
Charts
Cycle Times, 24 Hr. Ice Production and
Refrigerant Pressure Charts
These charts are used as guidelines to verify correct
ice machine operation.
Accurate collection of data is essential to obtain the
correct diagnosis.
• Refer to “Operational Analysis Chart” for the list of
data that must be collected for refrigeration
diagnostics. This list includes: before beginning
service, ice production check, installation/visual
inspection, water system checklist, ice formation
pattern, safety limits, comparing evaporator inlet/
outlet temperatures, hot gas valve analysis,
discharge and suction pressure analysis.
• Ice production checks that are within 10% of the
chart are considered normal. This is due to
variances in water and air temperature. Actual
temperatures will seldom match the chart exactly.
• Zero out manifold gauge set before obtaining
pressure readings to avoid misdiagnosis.
• Discharge and suction pressure are highest at the
beginning of the cycle. Suction pressure will drop
throughout the cycle. Verify the pressures are
within the range indicated.
Part Number 80-01111-9 7/10
203
QM20 SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
NOTE: The first cycle, at any temperature, will take up
to three minutes longer.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Air Temp.
Entering
Condenser
°F/°C
Freeze Time
Harvest
Time
Water Temperature °F/°C
50/10
68/20
86/30
68/20
15-18
16-19
16-19
77/25
16-19
18-21
18-21
86/30
20-23
21-24
21-24
95/35
24-27
26-29
26-29
1.5-3.5
Times in minutes
24-Hour Ice Production
Water Temperature °F/°C
Air Temp.
Entering
Condenser
°F/°C
lb
kg
lb
kg
lb
kg
68/20
46
21
42
19
37
17
77/25
44
20
40
18
35
16
86/30
40
18
37
17
33
15
95/35
35
16
33
15
29
13
50/10
68/20
86/30
Based on average ice slab weight of 0.46 – 0.60 lb (200 – 275 g)
204
Part Number 80-01111-9 7/10
QM30 SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
NOTE: The first cycle, at any temperature, will take up
to three minutes longer.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Entering
Condenser
°F/°C
50/10
95/35
104/40
70/21
9.1-12.9
9.4-13.4
10.2-14.5
Water Temperature °F/°C
80/27
10.0-14.2
10.5-14.8
11.4-16.1
90/32
10.9-15.4
11.4-16.1
12.6-17.7
100/38
12.3-17.3
12.9-18.1
14.3-20.1
Harvest
Time
1.253.25
Times in minutes
24-Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
Water Temperature °F/°C
50/10
70/21
90/32
70/21
60
58
54
80/27
55
53
49
90/32
51
49
45
100/38
46
44
40
Based on ice slab weight of .44 – .60 lb (200 – 275 g)
Part Number 80-01111-9 7/10
205
QM45 SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
NOTE: The first cycle, at any temperature, will take up
to three minutes longer.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Entering
Condenser
°F/°C
50/10
70/21
90/32
70/21
14.6-16.5
17.6-19.9
20.3-23.0
80/27
15.5-17.5
18.9-21.3
22.0-24.9
90/32
17.6-19.9
22.0-24.9
26.3-29.7
100/38
20.3-23.0
23.9-27.1
29.0-32.8
Water Temperature °F/°C
Harvest
Time
1.0-2.5
Times in minutes
24-Hour Ice Production
Water Temperature °F/°C
Air Temp.
Entering
Condenser
°F/°C
50/10
lb/kg
lb/kg
lb/kg
70/21
95/43
80/36
70/32
80/27
90/41
75/34
65/29
90/32
80/36
65/30
55/25
100/38
70/32
60/27
50/23
70/21
90/32
Based on an average ice slab weight of 1.0 – 1.3 lb (400 – 600g)
206
Part Number 80-01111-9 7/10
QM45 OPERATING TEMPERATURES
NOTE: Suction temp drops gradually throughout the freeze cycle.
50°F (10°C) Water
Freeze Cycle
Air Temp.
Entering
Condenser
Harvest Cycle
Discharge
Temp
°F (°C)
Suction
Temp
°F (°C)
Discharge
Temp
°F (°C)
Suction
Temp
°F (°C)
50°F
(10°C)
150-165
(66-74)
67-50
(19-10)
155-190
(68-88)
50-60
(10-16)
70°F
(21°C)
155-185
(68-85)
67-50
(19-10)
160-190
(71-88)
50-60
(10-16)
80°F
(27°C)
170-190
(78-88)
71-58
(22-14)
175-190
(79-88)
52-65
(11-18)
90°F
(32°C)
180-205
(82-96)
75-65
(24-18)
185-210
(85-99)
55-70
(13-21)
100°F
(39°C)
190-215
(88-102)
85-70
(29-21)
195-220
(91-104)
60-75
(16-24)
70°F (21°C) Water
Freeze Cycle
Air Temp.
Entering
Condenser
Harvest Cycle
Discharge
Temp
°F (°C)
Suction
Temp
°F (°C)
Discharge
Temp
°F (°C)
Suction
Temp
°F (°C)
50°F
(10°C)
155-175
(68-79)
68-58
(20-14)
160-175
(71-79)
50-60
(10-16)
70°F
(21°C)
160-185
(71-85)
70-50
(21-10)
160-190
(71-85)
50-65
(10-18)
80°F
(27°C)
170-200
(77-93)
75-58
(24-14)
170-200
(77-94)
55-70
(13-21)
90°F
(32°C)
180-205
(82-96)
85-65
(29-18)
185-210
(85-99)
55-75
(13-24)
100°F
(39°C)
190-220
(88-104)
88-70
(31-21)
200-220
(93-104)
60-75
(16-24)
90°F (32°C) Water
Freeze Cycle
Air Temp.
Entering
Condenser
Harvest Cycle
Discharge
Temp
°F (°C)
Suction
Temp
°F (°C)
Discharge
Temp
°F (°C)
Suction
Temp
°F (°C)
50°F
(10°C)
155-180
(68-82)
75-50
(24-10)
160-185
(71-85)
52-65
(11-18)
70°F
(21.1°C)
160-185
(71-85)
75-53
(24-12)
165-190
(74-88)
52-65
(11-18)
80°F
(26.7°C)
170-195
(77-91)
80-58
(27-14)
175-195
(79-91)
57-75
(14-24)
90°F
(32.2°C)
190-205
(88-96)
85-64
(29-18)
195-215
(91-102)
55-75
(13-24)
100°F
(38.8°C)
190-215
(88-102)
91-70
(33-21)
195-220
(91-104)
60-80
(16-27)
Part Number 80-01111-9 7/10
207
SM50 SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Entering
Condenser
°F/°C
50/10
70/21
90/32
70/21
15.6-17.8
15.3-17.4
15.6-17.8
80/27
16.6-18.9
17.0-19.4
17.4-19.8
90/32
17.4-19.8
19.1-21.7
18.2-20.7
100/38
19.2-22.1
19.8-22.7
22.4-25.4
110/43
24.9-28.2
25.7-29.1
31.4-35.5
Water Temperature °F/°C
Harvest
Time
1.0-3.5
Times in minutes
24 Hour Ice Production
Water Temperature °F/°C
Air Temp. Entering
Condenser °F/°C
50/10
70/21
90/32
70/21
53
54
53
80/27
50
49
48
90/32
48
44
46
100/38
40
39
38
110/43
35
34
28
Based on the average weight of 1 harvest cycle .63 – .71 lb 
(286 – 322 g).
Nominal Individual Cube Weight .70 ounces (20 g)
Cubes Per Harvest Cycle 16
Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering
Condenser
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10
125-70
18-0
50-75
20-55
70/21
135-95
18-0
65-85
35-60
80/27
165-115
19-2
75-100
40-70
90/32
195-135
20-3
85-120
40-70
100/38
235-165
24-5
100-135
50-80
110/43
255-185
28-7
110-155
50-90
Suction pressure drops gradually throughout the freeze cycle
208
Part Number 80-01111-9 7/10
Q130 SELF-CONTAINED AIR-COOLED 
(Before Serial Number 310047287)
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Entering
Condenser
°F/°C
50/10
70/21
90/32
70/21
10.2-11.7
12.4-14.1
14.6-16.5
Harvest
Time
Water Temperature °F/°C
80/27
11.2-12.8
13.0-14.8
15.5-17.5
90/32
13.0-14.8
15.5-17.5
17.6-19.9
100/38
14.6-16.5
17.6-19.9
20.3-23.0
1.0-2.5
Times in minutes
24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
Water Temperature °F/°C
50/10.0
70/21.1
90/32.2
70/21.1
130
110
95
80/26.7
120
105
90
90/32.2
105
90
80
100/37.8
95
80
70
Based on average ice slab weight of 1.06-1.19 lb (481 – 540 g).
Regular cube derate is 7%
Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering
Condenser
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10
220-255
54-20
150-180
80-110
70/21
220-270
54-20
160-190
90-115
80/27
220-300
56-22
180-200
100-120
90/32
250-340
58-24
190-210
110-130
100/38
280-380
60-26
220-240
120-140
110/43
290-400
62-28
230-260
120-160
Suction pressure drops gradually throughout the freeze cycle
Part Number 80-01111-9 7/10
209
Q130 SELF-CONTAINED AIR-COOLED
(After Serial Number 310047287)
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Entering
Condenser
°F/°C
50/10
70/21
90/32
70/21
10.2-12.4
12.3-14.8
14.3-17.2
80/27
11.7-14.1
13.6-16.3
16.1-19.3
90/32
13.6-16.3
15.2-18.2
18.3-21.9
100/38
15.2-18.2
18.3-21.9
21.1-25.2
Water Temperature °F/°C
Harvest
Time
0.75-2.5
Times in minutes
24 Hour Ice Production
Air Temp.
Entering
Condenser
°F/°C
50/10
70/21
90/32
70/21
135
115
100
80/27
120
105
90
90/32
105
95
80
100/38
95
80
70
Water Temperature °F/°C
Based on average ice slab weight of 1.06-1.19 lb (481 – 540 g).
Regular cube derate is 7%
Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering
Condenser
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
50/10
200-255
55-28
135-170
80-110
70/21
200-255
60-28
140-170
90-120
80/27
220-265
65-29
145-190
100-130
90/32
250-320
70-31
155-200
110-150
100/38
300-380
80-33
100-235
120-180
110/43
330-400
90-34
200-250
140-190
Suction
Pressure
PSIG
Suction pressure drops gradually throughout the freeze cycle
210
Part Number 80-01111-9 7/10
Q130 SELF-CONTAINED WATER-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Around Ice
Machine
°F/°C
50/10
70/21
90/32
70/21
10.2-12.4
12.3-14.8
14.3-17.2
80/27
10.7-12.9
12.3-14.8
15.2-18.2
90/32
10.7-12.9
12.9-15.5
15.2-18.2
100/38
11.2-13.5
12.9-15.5
16.1-19.3
Water Temperature °F/°C
Harvest
Time
1.0-2.5
Times in minutes
24 Hour Ice Production
Water Temperature °F/°C
Air Temp. Around Ice
Machine °F/°C
50/10
70/21
90/32
70/21
135
115
100
80/27
130
115
95
90/32
130
110
95
100/38
125
110
90
Based on average ice slab weight of 1.06 - 1.19 lb (481 – 540 g).
Regular cube derate is 7%
Condenser
Water
Consumption
Gal/24 hours
90/32 Air Temperature Around Ice Machine
Water Temperature °F/°C
50/10
70/21
90/32
150
200
460
Water regulating valve set to maintain 250 PSIG discharge pressure
Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice
Machine
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10
225-235
54-20
160-180
80-110
70/21
225-235
54-21
160-190
80-115
80/27
225-240
55-22
165-200
90-120
90/32
225-245
56-22
165-200
95-125
100/38
225-245
57-22
170-200
100-130
110/43
225-245
58-23
180-210
105-140
Suction pressure drops gradually throughout the freeze cycle
Part Number 80-01111-9 7/10
211
Q170 SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
NOTE: Data is preliminary.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Entering
Condenser
°F/°C
50/10
70/21
90/32
70/21
17.6-20-1
NA
24.5-28.0
Water Temperature °F/°C
80/27
NA
20.9-23.9
NA
90/32
20.9-23.9
24.5-28.0
28.1-31.9
100/38
NA
NA
33.7-38.3
Harvest
Time
1.0-2.5
Times in minutes
24 Hour Ice Production
Water Temperature °F/°C
Air Temp. Entering
Condenser °F/°C
50/10
70/21
90/32
70/21
175
NA
130
80/27
NA
150
NA
90/32
150
130
115
100/38
NA
NA
97
Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g).
Regular cube derate is 7%
Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering
Condenser
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10
220-280
60-38
150-170
90-110
70/21
220-280
60-38
150-170
95-115
80/27
240-290
70-38
160-190
100-120
90/32
280-330
75-38
180-210
160-140
100/38
310-380
85-41
200-230
120-160
110/43
315-390
90-41
200-240
140-170
Suction pressure drops gradually throughout the freeze cycle
212
Part Number 80-01111-9 7/10
Q210 SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Entering
Condenser
°F/°C
50/10
70/21
90/32
70/21
14.8-16.9
17.5-19.9
19.8-22.5
80/27
16.1-18.3
19.2-21.8
21.9-24.9
90/32
17.5-19.9
21.2-24.0
24.5-27.8
100/38
19.2-21.8
23.6-26.8
27.8-31.5
Water Temperature °F/°C
Harvest
Time
1.0-2.5
Times in minutes
24 Hour Ice Production
Water Temperature °F/°C
Air Temp. Entering
Condenser °F/°C
50/10
70/21
90/32
70/21
215
185
165
80/27
200
170
150
90/32
185
155
135
100/38
170
140
120
Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g).
Regular cube derate is 7%
Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering
Condenser
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10
220-270
60-36
180-205
90-110
70/21
220-270
60-36
185-210
95-115
80/27
235-280
66-36
190-215
100-120
90/32
265-310
70-38
200-225
105-125
100/38
310-360
76-40
220-245
110-130
110/43
320-380
80-42
230-255
115-135
Suction pressure drops gradually throughout the freeze cycle
Part Number 80-01111-9 7/10
213
Q210 SELF-CONTAINED WATER-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Cycle Time
Freeze Time
Air Temp.
Around Ice
Machine °F/°C
Water Temperature °F/°C
50/10
70/21
90/32
70/21
14.5-16.5
15.6-17.8
19.2-21.8
80/27
14.8-16.9
16.1-18.3
19.8-22.5
90/32
15.6-17.8
17.0-19.3
21.2-24.0
100/38
16.1-18.3
17.5-19.9
21.9-24.9
Harvest
Time
1.0-2.5
Times in minutes
24 Hour Ice Production
Air Temp. Around
Ice
Machine °F/°C
Water Temperature °F/°C
50/10
70/21
90/32
70/21
220
205
170
80/27
215
200
165
90/32
205
190
155
100/38
200
185
150
Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g).
Regular cube derate is 7%
90/32 Air Temperature Around Ice Machine
Condenser Water
Consumption
Gal/24 hours
Water Temperature °F/°C
50/10
70/21
90/32
160
270
1500
Water regulating valve set to maintain 230 PSIG discharge pressure
Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice
Machine
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
70-95
50/10
225-235
60-35
160-180
70/21
225-235
60-36
160-180
70-95
80/27
225-235
60-36
165-185
80-100
90/32
225-240
60-37
170-190
90-115
100/38
225-240
60-38
175-195
100-120
110/43
225-245
60-38
180-200
100-120
Suction pressure drops gradually throughout the freeze cycle.
214
Part Number 80-01111-9 7/10
Q270 SELF-CONTAINED AIR-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Entering
Condenser
°F/°C
50/10
70/21
90/32
70/21
11.0-12.6
12.8-14.7
14.5-16.5
80/27
11.3-12.9
13.1-15.0
14.8-16.9
90/32
12.6-14.3
14.8-16.9
17.0-19.3
100/38
14.1-16.1
17.0-19.3
19.8-22.5
Water Temperature °F/°C
Harvest
Time
1.0-2.5
Times in minutes
24 Hour Ice Production
Water Temperature °F/°C
Air Temp. Entering
Condenser °F/°C
50/10
70/21
90/32
70/21
280
245
220
80/27
275
240
215
90/32
250
215
190
100/38
225
190
165
Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g).
Regular cube derate is 7%
Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Entering
Condenser
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
50/10
200-255
60-22
165-200
70-95
70/21
200-255
60-22
170-205
70-100
80/27
200-295
61-23
175-210
75-100
90/32
240-330
65-26
205-240
80-100
100/38
265-375
66-30
220-260
85-115
Suction
Pressure
PSIG
Suction pressure drops gradually throughout the freeze cycle
Part Number 80-01111-9 7/10
215
Q270 SELF-CONTAINED WATER-COOLED
NOTE: These characteristics may vary depending on
operating conditions.
Cycle Times
Freeze Time + Harvest Time = Total Cycle Time
Freeze Time
Air Temp.
Around Ice
Machine
°F/°C
50/10
70/21
90/32
70/21
10.6-12.2
12.3-14.0
13.5-15.4
80/27
10.8-12.4
12.6-14.3
13.8-15.7
90/32
11.0-12.6
12.8-14.7
14.1-16.1
100/38
11.3-12.9
13.1-15.0
14.5-16.5
Water Temperature °F/°C
Harvest
Time
1.0-2.5
Times in minutes
24 Hour Ice Production
Air Temp. Around
Ice
Machine °F/°C
Water Temperature °F/°C
50/10
70/21
90/32
70/21
290
255
235
80/27
285
250
230
90/32
280
245
225
100/.8
275
240
220
Based on average ice slab weight of 2.44 - 2.75 lb (1107 – 1247 g).
Regular cube derate is 7%
Condenser
Water
Consumption
Gal/24 hours
90/32 Air Temperature Around Ice Machine
Water Temperature °F/°C
50/10
70/21
90/32
240
410
2740
Water regulating valve set to maintain 240 PSIG discharge pressure
Operating Pressures
Freeze Cycle
Harvest Cycle
Air Temp.
Around Ice
Machine
°F/°C
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Suction
Pressure
PSIG
50/10
235-245
52-24
175-210
80-95
70/21
235-245
54-24
175-210
80-95
80/27
235-250
56-24
175-210
80-95
90/32
235-255
58-24
175-210
80-95
100/38
235-260
60-24
175-210
80-95
Suction pressure drops gradually throughout the freeze cycle
216
Part Number 80-01111-9 7/10
Diagrams
Wiring Diagrams
The following pages contain electrical wiring diagrams
Be sure you are referring to the correct diagram for the
ice machine you are servicing.
! Warning
Always di sconnect po wer before w
electrical circuitry.
orking o n
Wiring Diagram Legend
The following symbols are used on all of the wiring
diagrams:
*
Internal Compressor Overload
(Some models have external compressor
overloads)
**
Fan Motor Run Capacitor
(Some models do not incorporate fan
motor run capacitor)
()
Wire Number Designation
(The number is marked at each end of the
wire)
—>>—
Multi-pin Connection
(Electrical Box Side) —>>—
(Compressor Compartment Side)
Part Number 80-01111-9 7/10
217
QM20
CAUTION: DISCONNECT POWER BEFORE WORKING ON
ELECTRICAL CIRCUITRY.
NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE.
SEE SERIAL PLATE FOR VOLTAGE.
L1
L2 (N)
COMPRESSOR
THERMISTOR
R
OVERLOAD
PROTECTOR
(3)
C
ICE THICKNESS
ADJUSTMENT
DIAL
(9)
CONTROL
BOARD
(24)
S
STARTING
DEVICE
FAN MOTOR
(AIR COOLED ONLY)
(23)
LIGHT
(14)
1
WATER
PUMP
(22)
HOT GAS
SOLENOID
(21)
2
3
(13)
(20)
(6)
FUSE
TRANS.
(2)
A
WATER FILL
SOLENOID
(8)
(1)
(7)
TOGGLE SWITCH
ON
OFF
(12)
(4)
WASH
BIN THERMOSTAT
( ) - WIRE NUMBER DESIGNATION
(IS MARKED AT EACH END OF WIRE)
- FEMALE/MALE CONNECTOR
SV1774
218
Part Number 80-01111-9 7/10
QM30
115V/1 Ph/60 Hz
CAUTION: DISCONNECT POWER BEFORE WORKING ON
ELECTRICAL CIRCUITRY.
NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE.
L1
(N)
(27)
(26)
COMPRESSOR
THERMISTOR
COMPRESSOR
RELAY CONTACTS
R
OVERLOAD
PROTECTOR
(3)
C
CONTROL
BOARD
S
(25)
1
3
COMPRESSOR
RELAY COIL
(9)
(24)
STARTING
DEVICE
FAN MOTOR
(AIR COOLED ONLY)
OVERFLOW 1
JUMPER WIRE
(AIR COOLED)
OVERFLOW 2
LIGHT
(23)
(14)
1
(22)
WATER
PUMP
HOT GAS
SOLENOID
(21)
2
3
(13)
FUSE
(20)
(6)
TRANS.
B
(2)
WATER FILL
SOLENOID
(8)
(1)
(7)
TOGGLE SWITCH
ON
OFF
WASH
(12)
(4)
BIN THERMOSTAT
( ) - WIRE NUMBER DESIGNATION
(IS MARKED AT EACH END OF WIRE)
- FEMALE/MALE CONNECTOR
SV1775
Part Number 80-01111-9 7/10
219
QM30
230V/1 Ph/50 Hz
CAUTION: DISCONNECT POWER BEFORE WORKING ON
ELECTRICAL CIRCUITRY.
NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE.
SEE SERIAL PLATE FOR VOLTAGE.
L1
L2 (N)
COMPRESSOR
THERMISTOR
R
OVERLOAD
PROTECTOR
(3)
C
ICE THICKNESS
ADJUSTMENT
DIAL
CONTROL
BOARD
(9)
LIGHT
(24)
STARTING
DEVICE
S
(23)
FAN MOTOR
(AIR COOLED ONLY)
OVERFLOW 1
JUMPER WIRE
(AIR COOLED)
OVERFLOW 2
(14)
1
WATER
PUMP
(22)
HOT GAS
SOLENOID
(21)
2
3
(13)
(20)
(6)
FUSE
TRANS.
C
(2)
WATER FILL
SOLENOID
(8)
(1)
(7)
TOGGLE SWITCH
ON
OFF
(12)
(4)
WASH
BIN THERMOSTAT
( ) - WIRE NUMBER DESIGNATION
(IS MARKED AT EACH END OF WIRE)
- FEMALE/MALE CONNECTOR
SV1773
220
Part Number 80-01111-9 7/10
QM45
CAUTION: DISCONNECT POWER BEFORE
WORKING ON ELECTRICAL CIRCUITRY.
NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE.
SEE SERIAL PLATE FOR VOLTAGE.
L1
(22)
ICE
THICKNESS
PROBE
L2 (N)
ON
(24)
OFF
BIN SWITCH
WASH
(23)
TOGGLE SWITCH
(20)
CONTROL
BOARD
(10)
(21)
BIN
SWITCH
LIGHT
(11)
HARVEST
LIGHT
(2)
RELAY COIL
(3)
3
2
(7)
HOT GAS
SOLENOID
1
(6)
FUSE
(8)
TRANS.
WATER PUMP
(5)
(4)
(9)
FAN MOTOR
(12)
FAN CYCLE
CONTROL
COMPRESSOR
CONTACTOR
CONTACTS
OVERLOAD
PROTECTOR
(15)
R
STARTING
DEVICE
(13)
2
4
C
S
SV1776
Part Number 80-01111-9 7/10
221
SM50
CAUTION: DISCONNECT POWER BEFORE
WORKING ON ELECTRICAL CIRCUITRY.
NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE.
L1
L2
START
CAPACITOR
S
COMPRESSOR
(23)
(32)
C
R
(33)
CONTROL BOARD
START
RELAY
(24)
(20)
TRANS.
DRAIN
PUMP
FUSE (7A)
(25)
HOT GAS
SOLENOID
(26)
(47)
(29)
(48)
FAN MOTOR
(42)
THERMISTOR
(41)
BIN
LIGHT
(27)
(44)
(45)
(43)
BIN
LIGHT
SWITCH
DRAIN
PUMP
SWITCH
BIN
THERMOSTAT
(46)
(28)
WATER INLET
(31)
DISPLAY
BOARD
(22)
WATER PUMP
(21)
222
Part Number 80-01111-9 7/10
Q130/Q210
Tecumseh Compressor
L1
L2 (N)
NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE.
SEE SERIAL PLATE FOR VOLTAGE
(22)
ICE THICKNESS
PROBE
ON
(24)
OFF
BIN SWITCH
(23)
WASH
TOGGLE SWITCH
(20)
CONTROL
BOARD
(21)
(10)
BIN
SWITCH
LIGHT
(11)
HARVEST
LIGHT
(2)
CONTACTOR COIL
(3)
3
2
(7)
HOT GAS
SOLENOID
1
(6)
FUSE
(8)
TRANS.
WATER PUMP
(5)
(14)
(4)
HIGH PRES.
CUTOUT
(9)
FAN MOTOR
(AIR COOLED ONLY)
(12)
FAN CYCLE CONTROL
COMPRESSOR
R
CONTACTOR
CONTACTS
(15)
(13)
Part Number 80-01111-9 7/10
OVERLOAD
PROTECTOR
STARTING
DEVICE
C
S
223
Q130/Q170/Q210
Danfoss Compressor
NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE.
SEE SERIAL PLATE FOR VOLTAGE
L1
(22)
ICE THICKNESS
PROBE
L2 (N)
ON
(24)
OFF
BIN SWITCH
WASH
(23)
TOGGLE SWITCH
(20)
CONTROL
BOARD
(21)
(10)
BIN
SWITCH
LIGHT
(11)
(2)
HARVEST
LIGHT
RELAY COIL
(3)
3
2
(7)
HOT GAS
SOLENOID
1
(6)
(8)
FUSE
WATER PUMP
TRANS.
(14)
(5)
(4)
HIGH PRES.
CUTOUT
(9)
(12)
FAN MOTOR
(AIR COOLED ONLY)
FAN CYCLE CONTROL
RELAY
CONTACTS
(15)
224
OVERLOAD
PROTECTOR
(13)
R 11
3 C
COMPRESSOR S
START
CAPACITOR
13
10
START
Part Number 80-01111-9 7/10
Q270
Tecumseh Compressor
CAUTION: DISCONNECT POWER BEFORE
WORKING ON ELECTRICAL CIRCUITRY.
DIAGRAM SHOWN DURING THE FREEZE CYCLE.
SEE SERIAL PLATE FOR VOLTAGE
L1
(22)
ICE
THICKNESS
PROBE
L2 (N)
ON
(24)
OFF
BIN SWITCH
(23)
WASH
TOGGLE SWITCH
CONTROL
BOARD
(20)
(21)
BIN
SWITCH
LIGHT
(GREEN)
(10)
CONTACTOR COIL
(2)
HOT GAS
SOLENOID
3
(7)
(6)
2
WATER
PUMP
(5)
1
TRANS. FUSE (10A)
FAN CYCLE
CONTROL
(4)
(14)
(16)
(3)
HARVEST
LIGHT
(RED)
HIGH PRES.
CUTOUT
CONTACTOR
CONTACTS
FAN MOTOR
(AIR COOLED
ONLY)
COMPRESSOR
(12)
(15)
R
(43)
START RELAY
(9)
(7)
(49)
S
(47)
C (48)
S
(49)
RUN
COMPRESCAPACISOR
TOR
(46)
(47)
R
R
R
C S(48)
(44) S
(43)
1
5 2
(8)
2
(2)
1
L
(7)
M
(16)
(45)
S
START RELAY (44) S
(CURRENT
(2)
TYPE)
START
(16)
CAPACITOR
(45)
S
START
CAPACITOR
230V OPTION
Part Number 80-01111-9 7/10
115V OPTION
( ) - WIRE NUMBER DESIGNATION
(IS MARKED AT EACH END OF WIRE)
—<<— - FEMALE/MALE CONNECTOR
SV1777
225
Q270
Danfoss Compressor
NOTE: DIAGRAM SHOWN DURING THE FREEZE CYCLE.
SEE SERIAL PLATE FOR VOLTAGE
L1
TOGGLE SWITCH
(22)
ON
(24)
ICE THICKNESS
PROBE
L2 (N)
OFF
BIN SWITCH
WASH
(23)
(20)
CONTROL
BOARD
(21)
(11)
BIN
SWITCH
LIGHT
(GREEN)
(10)
HARVEST
LIGHT
(RED)
(2)
RELAY
(3)
3
2
(7)
HOT GAS
SOLENOID
1
(6)
FUSE
(8)
TRANS.
WATER PUMP
(5)
(9)
(4)
HIGH PRES.
CUTOUT
FAN MOTOR
(AIR COOLED ONLY)
(12)
(14)
FAN CYCLE
CONTROL
(13)
(15)
RELAY
CONTACTS
226
COMPRESSOR
R
13
3 C
S
11
START
CAPACITOR
10
Part Number 80-01111-9 7/10
Electronic Control Boards
QM20/QM30
LIQUID LINE
THERMISTOR
CONNECTION
ICE BRIDGE
THICKNESS
CONTROL
-2
-3
-4
-1 0 1 2
-5
3
4
POWER
LIGHT
8 AMP FUSE
Part Number 80-01111-9 7/10
227
QM45/Q130/Q170/Q210/Q270
ICE THICKNESS
PROBE
DC LOW VOLTAGE
ELECTRICAL PLUG
BIN SWITCH LIGHT
HARVEST LIGHT
AC LINE VOLTAGE
ELECTRICAL PLUG
10 AMP FUSE
228
Part Number 80-01111-9 7/10
SM50
FUSE (7A)
TRANSFORMER
THERMISTOR
BIN LIGHT
CONNECTION
DISPLAY BOARD
CONNECTION
BIN LIGHT
SWITCH
BIN THERMOSTAT
CONNECTION
Part Number 80-01111-9 7/10
229
Tubing Schematics
QM20/QM30 Tubing Schematic
HEAT
EXCHANGER
CAP TUBE
COMPRESSOR
EVAPORATOR
HOT GAS SOLENOID
VALVE
CONDENSER
DRIER
SV3022
230
Part Number 80-01111-9 7/10
QM45/Q130 Tubing Schematic
EVAPORATOR
HEAT
EXCHANGER
EXPANSION
VALVE
COMPRESSOR
HOT GAS
SOLENOID
STRAINER
AIR OR WATER
CONDENSER
DRIER
RECEIVER (Q130
WATER COOLED ONLY)
SV3024
Part Number 80-01111-9 7/10
231
SM50 Tubing Schematic
HEAT
EXCHANGER
CAP TUBE
COMPRESSOR
EVAPORATOR
HOT GAS SOLENOID
VALVE
CONDENSER
DRIER
232
Part Number 80-01111-9 7/10
Q170/Q210/Q270 Tubing Schematic
EVAPORATOR
HEAT
EXCHANGER
EXPANSION
VALVE
HOT GAS
SOLENOID VALVE
COMPRESSOR
STRAINER
AIR OR
WATER
CONDENSER
DRIER
COMPRESSOR
RECEIVER
(WATER COOLED ONLY)
SV3023
Part Number 80-01111-9 7/10
233
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234
Part Number 80-01111-9 7/10
© 2008 Manitowoc
Part Number 80-01111-9 7/10
Manitowoc Foodservice
2110 South 26th Street, P.O. Box 1720
Manitowoc, WI 54221-1720, USA
Ph: 920-682-0161 Fax: 920-683-7589
Visit us online at: www.manitowocice.com
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