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Scotsman CU50 - page 1
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. 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 notic ...
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Scotsman CU50 - page 2
Specifications 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 limited conditions (see user manual), outdoors, but there are limits. Use outside of the listed limitations is misuse and will void the warranty. Air temperature limits: The ice machine will oper ...
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Scotsman CU50 - page 3
Cabinet Layout March 2010 Page 3 CU50 Service Manual 1.00 LEG ADJUS T MENT [25.40] 14.88 377.95 AIR OUT AIR IN 3.88 98.55 17.45 443.23 F L OOR D R AIN AC CESS HOLE 34.38 873.25 3.85 97.79 29.66 753.24 22.29 566.17 23.89 606.68 1.60 40.51 3.20 81.28 3.27 82.99 2.44 62.04 1.57 39.75 7.44 188.98 3.83 97.16 115 V PO WER C ORD PO TA B L E W A TER INLET ...
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Scotsman CU50 - page 4
Air flow The machine takes in room temperature air at the lower right front and forces warm air out the lower left front. Restricting the airflow will adversely affect the ability of the ice machine to make ice. Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance. They meet or exceed the standards o ...
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Scotsman CU50 - page 5
Water Quality All water, including potable water supplied by municipalities, contains some impurities or minerals. Water absorbs impurities from the air as rain and/or as it flows through the ground. Some of the impurities are solid particles, these are known as suspended solids, and a fine particle filter will remove them. Other impurities are che ...
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Scotsman CU50 - page 6
Door swing change The door can be attached to open with hinges on the left or right. Retain all screws for re-use. To change: 1. Remove top hinge pin from hinge. 2. Tilt top of door away from cabinet and lift door off bottom hinge. 3. Remove two screws and top hinge. 4. Remove plugs or screws from lower cabinet bracket 5. Attach top hinge to lower ...
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Scotsman CU50 - page 7
Installation Notes 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. Be ...
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Scotsman CU50 - page 8
Installation: Water & Drain The recommended water supply tubing is ¼ inch OD copper. Stainless steel flex or reinforced PVC tube may also be used. Install an easily accessible shut-off valve between the supply and the unit. This shut-off valve should not be installed behind the unit. Note: Do not use self-piercing type valves. 1. Remove the fr ...
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Scotsman CU50 - page 9
Gravity Drain Caution: Restrictions in the drain system to the machine will cause water to back up into the ice storage bin and melt the ice. Gravity drain tubing must be vented, have no kinks and slope to the building drain. Air gaps are typically required by local code. 1. Place the ice machine in front of the installation opening. Adjust levelin ...
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Scotsman CU50 - page 10
Electrical 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. Connect the machine to its own 115 volt, 15 amp circuit. 1. If the electrical outlet for the ice maker is behind the unit, plug in the unit. 2. Position the unit in the installation opening ...
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Scotsman CU50 - page 11
Cube Size Adjustment 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. To adjust cube size: 1. Shut the machine off: If it 's off on bin full press and release the On/Off button once, switching the Ice Making ligh ...
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Scotsman CU50 - page 12
Harvest Time Adjustment 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. Note: Do not set harvest time shorter than the actual time it takes to release all the cubes. To adjust Harvest Time: 1. Shut the machine off by holding the On/Off button in until ...
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Scotsman CU50 - page 13
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. Press and hold the On/Off button until the unit shuts off. No lights should be on. 2. Press an ...
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Scotsman CU50 - page 14
Use 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. The machine can be shut off anytime by just pushing and releasing the On/Off button. The machine will shut off at the end of ...
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Scotsman CU50 - page 15
How to clean the condenser and winterize. Condenser cleaning The condenser is like the radiator on a car, it has fins and tubes that can become clogged with dirt and lint. To clean: 1. Remove the kickplate and front service panel. 2. Locate the condenser surface. 3. Vacuum the surface, removing all dust and lint. Caution: Do not dent the fins. 4. R ...
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Scotsman CU50 - page 16
How to remove scale from the ice making system. 1. Scoop out all of the ice, either discard it or save it in an ice chest or cooler. 2. Press and HOLD the On/off button in for 3 seconds until the Green light goes out. 3. Press and HOLD the both the Clean-Reset and On/Off buttons for 5 seconds. The Time to Clean light will blink on and off. 4. Pour ...
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Scotsman CU50 - page 17
System Information Overall: • Refrigerant: 8 oz R-134a • Compressor: Hermetic, 1300 BTUH, • Condenser: Forced draft • Fan blade: 5 blade, 7 inch • Evaporator: Inverted, 24 cube cells. Copper cups attached to continuous serpentine • Metering device: Cap tube • Defrost method: Hot gas bypass with water assist • Spray method: 6 water j ...
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Scotsman CU50 - page 18
Water System The controller uses a Water Sensor to check for the presence of water in the reservoir and to 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. The higher the mineral content of the water, the better ...
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Scotsman CU50 - page 19
Components March 2010 Page 19 CU50 Service Manual Control Panel, Bin Light and Curtain Evaporator Platen Scoop and Thermostat Bracket Evaporator and Controller Condenser and Bin Thermostat Inlet Water Solenoid Valve Model and Serial Tag Location ...
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Scotsman CU50 - page 20
Controller The controller is located at the front of the unit, under the top panel. It is powered by a 12 volt transformer. It has 5 indicator lights: • Compressor - Light is ON if compressor is powered • Water - Light is ON if inlet water solenoid valve is powered • Hot Gas - Light is ON when Hot Gas Valve is powered • Fan - Light is ON wh ...
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Scotsman CU50 - page 21
Performance Information Ice per cycle: 1 lb Water drained / cycle: Varies by harvest cycle length and purge setting. Typical amounts are @ 70/50 = 52 oz. @ 90/70 = 13 oz Compressor amps: 2.6 - 3.2 March 2010 Page 21 CU50 Service Manual Freeze Cycle, Minutes Air Temperature 100 90 80 70 60 50 Water Temperature 100 37-38 36-37 34-35 32-33 31-32 29-30 ...
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Scotsman CU50 - page 22
Refrigeration System March 2010 Page 22 CU50 Service Manual Suct i on Pr essur e -1 0 0 10 20 30 40 50 60 70 Ti m e PSIG D isch ar g e P r e ssur e 50 60 70 80 90 10 0 110 12 0 13 0 14 0 15 0 Tim e PSIG ...
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Scotsman CU50 - page 23
Thermistor Values March 2010 Page 23 CU50 Service Manual 0 ···· 85325 1 ···· 82661 2 ···· 80090 3 ···· 77607 4 ···· 75210 5 ···· 72896 6 ···· 70660 7 ···· 68501 8 ···· 66415 9 ···· 64400 10 · · · 62453 11 · · · 60571 12 · · · 58752 13 · · · 56995 14 · · · 55296 15 · · · 53653 16 · · · 520 ...
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Scotsman CU50 - page 24
Service Diagnosis No Ice Problem Likely Cause Probable Solution No power to unit Power disconnected Check breaker or fuse. Reset or replace, restart and check No power to controller Transformer open Replace transformer Control panel failure Switch open Check membrane, see page 25. Shut down on maximum water fill time - water light flashing Water sh ...
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Scotsman CU50 - page 25
Service Diagnosis Makes excessive noise Problem Likely Cause Probable Solution Fan blade vibrates Blade is bent Replace fan blade 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 Tighten screws Makes ice, does not ...
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Scotsman CU50 - page 26
Removal and Repair Bin Thermostat 1. Disconnect electrical power. 2. Remove service panel. 3. Remove back panel. Note: If unit is built in it must be pulled out to change the bin thermostat. 4. Pull cap tube out from the back of the ice storage bin and cap tube holder. 5. Remove two screws and the bin thermostat contact section from its mounting br ...
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Scotsman CU50 - page 27
Removal and Repair Evaporator Thermistor Note: If unit is built in it must be pulled out to change the evaporator thermistor . 1. Shut machine off. If unit was making ice, manually harvest the ice. 2. Disconnect electrical power. 3. Remove top panel. 4. Remove cover from controller box. 5. Disconnect thermistor wire from controller. 6. Locate therm ...
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Scotsman CU50 - page 28
Removal and Repair - Cabinet Removal Certain components require the removal of the cabinet for repair access. 1. If the machine is in a freeze mode, perform a manual harvest. 2. Remove all ice. 3. Drain reservoir. 4. Remove service panel and kick plate. 5. Remove back panel. 6. Disconnect electrical power. 7. Disconnect water and drain tubing. 8. R ...
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Scotsman CU50 - page 29
18. Remove two screws holding freezing compartment brace to cabinet, lift brace up. 19. Lift evaporator platen up and tilt back enough for bin assembly to clear the base. 20. Remove air baffle. 21. Unplug 7 wire harness connector (at back of bin). 22. Remove 1 screw at each corner of the base. 23. Lift bin assembly off the base. Note: Prop evaporat ...
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Scotsman CU50 - page 30
Refrigeration Service This ice machine use R-134a type refrigerant. There are specific rules for handling that refrigerant. To check for system pressures, add a field supplied clamp-on type service valve as a temporary means of system access. After diagnosis and before final repair, replace the clamp-on type valve with valves that are brazed onto t ...
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