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Manitowoc
Ice Maker
QM20
Manitowoc QM20 User Manual
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52
Part Number 80-01111-9
7/10
F
.
Remove the Float V
alve
•
T
urn the
splash shield
counterclockwise o
ne or
two turn
s.
FLOAT V
ALVE REMOVAL
•
Pull the float valve forward
an
d off the mounting
bracket.
•
Disconnect the
water
i
nlet
tube
from
th
e float
valve
at the compression
fitting.
•
Remove the cap and filter
screen for cleaning.
SV1695
-2
FLOAT V
ALVE
BRACKET
COMPRESSION
FITTING
CAP AND
FILTER
SCREEN
SP
L
A
S
H
SHIELD
SHUT-OFF
VA
L
V
E
FLOAT
51
53
Table of Contents
Default Chapter
3
Safety Notices
3
Table of Contents
5
General Information
11
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
23
Location of Ice Machine
23
Maintenance
24
Sm50
24
Ice Machine Clearance Requirements
24
Ice Machine Heat of Rejection
24
Leveling the Ice Machine
25
Component Identification
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
37
Qm45/Q130/Q170/Q210/Q270
37
Q270 Ice Machines
38
Qm20/Qm30
39
Sm50
41
Maintenance
43
Ice Machine Inspection
43
Exterior Cleaning
43
Cleaning the Condenser
43
Air-Cooled Condenser
44
Water-Cooled Condenser and Water Regulating Valve
44
Qm45/Q130/Q170/Q210/Q270
45
Interior Cleaning and Sanitizing
45
Qm20/Qm30
60
Cleaning and Sanitizing Procedure
60
Sm50
67
Cleaning Procedure
67
Sanitizing Procedure
68
Removal of Parts for Cleaning and Sanitizing
69
Removal from Service/Winterization
77
General
77
Air-Cooled Ice Machines
77
Water-Cooled Ice Machines
78
Operational Checks
79
Operation
79
Qm45/Q130/Q170/Q210/Q270
79
Initial Start-Up or Start-Up after Automatic Shut-Off
79
Freeze Sequence
79
Harvest Sequence
80
Automatic Shut-Off
80
Energized Parts Chart
81
Qm20/Qm30
83
Initial Start-Up or Start-Up after Automatic Shut-Off
83
Freeze Sequence
83
Harvest Sequence
84
Automatic Shut-Off
84
Energized Parts Chart
85
Sm50
86
Initial Start-Up or Start-Up after
86
Automatic Shut-Off
86
Energized Parts Chart
88
Operational Checks
89
Qm45/Q130/Q170/Q210/Q270
89
Qm20/Qm30
92
Sm50
95
Troubleshooting
99
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
128
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
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
Sm50
134
Component Check Procedures
159
Main Fuse
159
Function
159
Specifications
159
Check Procedure
159
Bin Switch
160
Qm45/Q130/Q170/Q210/Q270
160
Bin Thermostat
164
Qm20/Qm30
164
Sm50
166
Liquid Line Thermistor
169
Qm20/Qm30/Sm50
169
Diagnosing Start Components
171
Capacitor
171
Relay
171
ON/OFF/WASH Toggle Switch
172
Function
172
Specifications
172
Check Procedure
172
Fan Cycle Control
173
Qm45/Q130/Q170/Q210/Q270
173
Qm20/Qm30
173
Ice Thickness Probe
174
Qm45/Q130/Q170/Q210/Q270
174
Ice Thickness Check
175
Compressor Electrical Diagnostics
176
Check Resistance (Ohm) Values
176
Single Phase Compressors
176
Check Motor Windings to Ground
176
Compressor Drawing Locked Rotor
177
Compressor Drawing High Amps
177
Fan Cycle Control
178
Qm45/Q130/Q170/Q210/Q270
178
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
Filter-Driers
199
Fan Control Cycle
199
ON/OFF/WASH Toggle Switch
199
Component Specifications
199
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
High Pressure Cutout (HPCO) Control
200
Filter-Driers
200
Liquid Line Thermistor
200
Qm20/Qm30/Sm50
200
Total System Refrigerant Charge
201
Cycle Times, 24 Hr. Ice Production and Refrigerant Pressure Charts
203
QM20 Self-Contained Air-Cooled
204
QM30 Self-Contained Air-Cooled
205
QM45 Self-Contained Air-Cooled
206
QM45 Operating Temperatures
207
SM50 Self-Contained Air-Cooled
208
Q130 Self-Contained Air-Cooled
209
(Before Serial Number 310047287)
209
Operating Pressures
209
Q130 Self-Contained Air-Cooled
210
(After Serial Number 310047287)
210
Q130 Self-Contained Water-Cooled
211
Q170 Self-Contained Air-Cooled
212
Q210 Self-Contained Air-Cooled
213
Q210 Self-Contained Water-Cooled
214
Q270 Self-Contained Air-Cooled
215
Q270 Self-Contained Water-Cooled
216
Wiring Diagrams
217
Qm20
218
Qm30
219
Qm30
220
Qm45
221
Sm50
222
Q130/Q210
223
Q130/Q170/Q210
224
Q270
225
Q270
226
Electronic Control Boards
227
Tubing Schematics
230
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Manitowoc QM20 Specifications
General
Brand
Manitowoc
Model
QM20
Category
Ice Maker
Language
English
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