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CU50
Service Manual
Introduction:
This ice machine is the result of Scotsman's
decades of experience as an industry leader in the
design and manufacture of both commercial and
residential ice machines.
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Cabinet Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
Water Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
Door swing change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6
Installation Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7
Installation: Water & Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Gravity Drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
Cube Size Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Harvest Time Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12
Control Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13
Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14
How to clean the condenser and winterize. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
How to remove scale from the ice making system. . . . . . . . . . . . . . . . . . . . . . . . . Page 16
System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17
Water System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 19
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20
Performance Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22
Thermistor Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 23
Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 24
Service Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
Removal and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
Removal and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 27
Removal and Repair - Cabinet Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28
Refrigeration Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30
This manual includes the information needed to
install, start up, maintain and service the ice
machine. Note any Caution or Warning indicators,
as they provide notice of potential hazards. Keep
this manual for future reference.
Table of Contents
March 2010
Page 1
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Summary of Contents for Scotsman CU50PA1C
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Page 1: Table Of Contents
CU50 Service Manual Introduction: This ice machine is the result of Scotsman’s This manual includes the information needed to decades of experience as an industry leader in the install, start up, maintain and service the ice design and manufacture of both commercial and machine. -
Page 2: Specifications
CU50 Service Manual Specifications Options: This ice machine is designed to be used in a controlled environment. It can be used in a wide variety of environmental conditions and under Kickplate Extension: In some situations the leg limited conditions (see user manual), outdoors, but levelers will be extended enough to become visible. -
Page 3: Cabinet Layout
CU50 Service Manual Cabinet Layout 98.55 FLOOR DRAIN ACCESS HOLE 3.88 443.23 17.45 606.68 23.89 566.17 22.29 40.51 377.95 1.60 14.88 753.24 29.66 873.25 DRAIN 34.38 FLEXIBLE TUBING 8/3 I.D. PUMP MODEL (INCLUDED) 8/5 I.D. GRAVITY MODEL (NOT INCLUDED) POTABLE WATER INLET 4/1"... -
Page 4: Air Flow
They meet or exceed the standards of agencies like U.L. Scotsman assumes no liability or responsibility of any kind for products manufactured by Scotsman that have been altered in any way, including the use of any parts and/or other components not specifically approved by Scotsman. -
Page 5: Water Quality
To keep the machine operating properly, these The ice machine must: impurities or minerals will have to be regularly dissolved by an acid cleaning, using Scotsman Ice • be connected to cold, potable water Machine Scale Remover. Directions for this may be •... -
Page 6: Custom Panel
CU50 Service Manual Door swing change The door can be attached to open with hinges on 6. Remove original bottom hinge. the left or right. Retain all screws for re-use. To change: 1. Remove top hinge pin from hinge. 7. Remove two plugs or screws from upper cabinet bracket. -
Page 7: Door Swing Change
Sealing to floor: In some cases the base of the ice machine must be sealed to the floor to meet local code. Food grade silastic sealant such as Scotsman part number 19-0529-01 is recommended. Place the machine in the intended location. Turn the leg levelers in until the bottom of the unit is as close to the floor as possible. -
Page 8: Installation: Water & Drain
CU50 Service Manual Installation: Water & Drain The recommended water supply tubing is ¼ inch Drains OD copper. Stainless steel flex or reinforced PVC tube may also be used. Install an easily accessible There are two types of ice machine models, one shut-off valve between the supply and the unit. -
Page 9: Gravity Drain
CU50 Service Manual Gravity Drain Caution: Restrictions in the drain system to the 4. Connect a straight 5/8” barbed connector to machine will cause water to back up into the ice the drain hose, securing with the clamp removed in storage bin and melt the ice. -
Page 10: Electrical
CU50 Service Manual Electrical Installation check list: The ice machine is supplied with a power cord. Do not remove the grounding pin from the cord’s plug. Do not use extension cords. Follow all codes. 1. Has the unit been connected to the proper Connect the machine to its own 115 volt, 15 amp water supply? circuit. -
Page 11: Cube Size Adjustment
CU50 Service Manual Cube Size Adjustment Side Views of Cubes The cube size can be adjusted by changing the amount of freeze cycle time. This is done by a button press sequence. Note: There is only one correct cube size. See the illustrations. -
Page 12: Harvest Time Adjustment
CU50 Service Manual Harvest Time Adjustment Harvest Time Table The harvest time can be adjusted so that all the ice harvests during the cycle, plus a few seconds extra. This is done by a button press sequence. On/Off Water Clean Default Note: Do not set harvest time shorter than the Add 10 seconds... -
Page 13: Control Settings
CU50 Service Manual Control Settings Automatic water purge enable / disable The control is set at the factory to automatically select the proper amount of water purge. If desired, that can be disabled, and a typical purge amount used. To disable Automatic purge selection: 1. -
Page 14: Use
CU50 Service Manual No special instructions are needed for use. Just take as much ice as you need, the machine will replace it. A scoop is provided, and it can be stored in the machine using the loop of tubing on the right side as a holder. -
Page 15: How To Clean The Condenser And Winterize
CU50 Service Manual How to clean the condenser and winterize Condenser cleaning Winterizing The condenser is like the radiator on a car, it has 1. Clean the ice making system. fins and tubes that can become clogged with dirt 2. Open the door and push and release the and lint. -
Page 16: How To Remove Scale From The Ice Making System
13. Replace the ice removed in step 1. light will blink on and off. 14. Push and release the On/Off button to restart 4. Pour 8 ounces of Scotsman Ice Machine ice making. Scale Remover (available from a local Scotsman... -
Page 17: System Information
CU50 Service Manual System Information Electrical Sequence: Overall: • Refrigerant: 8 oz R-134a A closed bin thermostat signals to the controller • Compressor: Hermetic, 1300 BTUH, a need for ice. The controller checks for water, • Condenser: Forced draft if water is needed , the controller opens the inlet water solenoid valve to fill the reservoir. -
Page 18: Water System
CU50 Service Manual Water System The controller uses a Water Sensor to check for the presence of water in the reservoir and to Evaporator measure the conductivity of the water. The water sensor consists of two stainless steel probes located in a holder next to the water pump. The probes sense the conductivity of the water. -
Page 19: Components
CU50 Service Manual Components Model and Serial Tag Location Scoop and Thermostat Bracket Control Panel, Bin Light and Curtain Evaporator Platen Evaporator and Controller Inlet Water Solenoid Valve Condenser and Bin Thermostat March 2010 Page 19... -
Page 20: Controller
CU50 Service Manual Controller High Evaporator Voltage Thermistor Connector Thermostat Comp Water Sensor Water Hot Gas Power Power Supply Control Panel Connector Ribbon The controller is located at the front of the unit, Control Safeties: under the top panel. No Water. If the Water Sensor cannot detect It is powered by a 12 volt transformer. -
Page 21: Performance Information
CU50 Service Manual Performance Information Air Temperature Freeze Cycle, Minutes 37-38 36-37 34-35 32-33 31-32 29-30 36-37 35-36 33-34 31-32 30-31 28-29 36-35 32-33 30-31 28-29 27-28 26-27 Water 32-33 28-29 27-28 25-26 23-24 22-23 Temperature 27-28 25-26 24-25 22-23 20-21 19-20 20-21... -
Page 22: Refrigeration System
CU50 Service Manual Refrigeration System Suction Pressure Time Discharge Pressure 1 50 1 40 1 30 1 20 1 1 0 1 00 Time March 2010 Page 22... -
Page 23: Thermistor Values
CU50 Service Manual Thermistor Values Deg. F · Ohms Deg. F · Ohms Deg. F · Ohms Deg. F · Ohms Deg. F · Ohms 85325 18873 5325 1819 82661 18381 5208 1785 80090 17903 5093 1752 77607 17439 4981 1719 75210 16988... -
Page 24: Service Diagnosis
CU50 Service Manual Service Diagnosis No Ice Problem Likely Cause Probable Solution Check breaker or fuse. Reset or No power to unit Power disconnected replace, restart and check No power to controller Transformer open Replace transformer Control panel failure Switch open Check membrane, see page 25. -
Page 25: Service Diagnosis
CU50 Service Manual Service Diagnosis Makes excessive noise Problem Likely Cause Probable Solution Blade is bent Replace fan blade Fan blade vibrates Fan motor mount is broken Replace motor mount Compressor vibrates Mounting loose Check mounting Water pump vibrates Pump bearings worn Replace pump Panels vibrate Mounting screws loose... -
Page 26: Removal And Repair
CU50 Service Manual Removal and Repair Bin Thermostat 9. Reverse to reassemble. 1. Disconnect electrical power. Curtain 1. Shut unit off. 2. Loosen both thumbscrews holding curtain Electrical Shock bracket to freezing chamber. Hazard. Disconnect electrical 3. Pull out and remove curtain with bracket from power before ice machine. -
Page 27: Removal And Repair
CU50 Service Manual Removal and Repair Evaporator Thermistor 5. Remove screws holding transformer to controller box and pull transformer up and out of Note: If unit is built in it must be pulled out to the ice machine. change the evaporator thermistor. 6. -
Page 28: Removal And Repair - Cabinet Removal
CU50 Service Manual Removal and Repair - Cabinet Removal Certain components require the removal of the 12. Remove curtain & hanger. cabinet for repair access. 1. If the machine is in a freeze mode, perform a manual harvest. 2. Remove all ice. 3. - Page 29 CU50 Service Manual 16. Remove two screws holding freezing 21. Lift bin assembly off the base. compartment brace to cabinet, lift brace up. Note: Prop evaporator assembly up. A 3’ length of 3/4” PVC tubing with one end inserted into the cup Brace mold and the other against the base will hold it up.
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Page 30: Refrigeration Service
CU50 Service Manual Refrigeration Service Bin Thermostat Altitude Adjustment Screw This ice machine use R-134a type refrigerant. There are specific rules for handling that refrigerant. Degrees Rotation to Altitude To check for system pressures, add a field supplied Turn Adjustment Screw clamp-on type service valve as a temporary means 1000 11 cw...
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