This document is an installation and user's manual for the Scotsman CU50 Cube Ice Machine. It provides comprehensive information for installing, operating, and maintaining the unit, designed for both indoor and limited outdoor use.
Function Description:
The Scotsman CU50 is a cube ice machine designed to produce potable ice for various applications. It operates by taking in room temperature air, circulating water over an ice-making platen, and then harvesting the formed ice cubes into a storage bin. The machine automatically replenishes ice as it is used or melts. It is available in two models: CU50GA-1A (gravity drain) and CU50PA-1A (pump drain), with the pump drain model capable of pumping water up to 10 feet high. The unit is designed to be connected to a cold, potable water supply, a drain, and a proper electrical supply.
Important Technical Specifications:
- Models: CU50GA-1A (gravity drain), CU50PA-1A (pump drain).
- Dimensions:
- Width: 14 7/8 inches
- Depth (with door panel, handle adds 1 5/8"): 22 3/4 inches
- Height: 33 3/8 inches to 34 3/8 inches (adjustable with leg levelers).
- Air Temperature Limits:
- Minimum: 50°F (10°C)
- Maximum: 100°F (38°C)
- Optimal operation: 70°F to 80°F.
- Water Temperature Limits:
- Minimum: 40°F (4.5°C)
- Maximum: 100°F (38°C)
- Water Pressure Limits:
- Minimum: 20 psi (1.4 bar)
- Maximum: 80 psi (5.5 bar)
- Electrical Voltage Limits:
- Minimum: 104 volts
- Maximum: 126 volts
- Electrical Connection: 115 volt, 15 amp dedicated circuit.
- Water Supply Tubing: Recommended ½ inch OD copper, with an easily accessible shut-off valve.
- Drain Tubing: 3/8 inch ID plastic for pump models (included), 5/8 inch ID for gravity models (not included).
- Ice Production: Makes 24 cubes per batch.
- Water Quality: Requires potable water. Can be supplied with Reverse Osmosis (RO) water if conductivity is no less than 10 microSiemens/cm. Deionized water is not recommended.
- Drain Pump Capacity (Pump Models): Can pump water up to 10 feet high. Includes a check valve.
Usage Features:
- Installation Flexibility: Can be used indoors or outdoors under limited conditions (avoid freezing, keep dry, provide shade, use UV-protected or copper water supply tubing).
- Door Swing Change: The door can be configured to open from either the left or right side, providing flexibility for placement.
- Airflow: Air intake is at the lower right front, and warm air exhaust is at the lower left front. Unrestricted airflow is crucial for optimal performance.
- Control Panel: Features an On-Off button, Ice Making indicator light (Green when operating), Check Water indicator light (Red when water supply issues), Time To Clean indicator light (blinks when cleaning is due), and a Clean-Reset button.
- Automatic Operation: Once started, the machine automatically fills with water, begins the ice-making cycle, and shuts off when the bin is full. It restarts automatically as ice levels fall.
- Ice Level Sensor: A loop of tubing on the right side of the storage bin acts as an ice level sensor, signaling the machine to shut off when ice reaches it.
- Scoop: A scoop is provided and can be stored in the machine.
- Quiet Operation: Designed for quiet operation, though normal noises like fan movement, water pump circulation, and ice hitting the bin during harvest are expected.
- Kickplate: A stainless steel kickplate cover is provided. It can be removed for indoor installations but must remain on for outdoor installations. A kickplate extension kit (KKPF) is available if leg levelers are visible.
- Cabinet Stability: A bracket kit (KATB) is available to secure the back of the cabinet to a wall for free-standing installations.
- Drain Conversion: Gravity drain models can be converted to pump drain models with a drain pump kit (A39462-021).
Maintenance Features:
- Regular Cleaning: Essential for proper operation and longevity. Recommended at least once per year, preferably twice, with more frequent cleaning dictated by water conditions or environmental factors (e.g., pets, carpets).
- Time To Clean Indicator: A light on the control panel illuminates after 6 months of use to remind the user to clean the ice-making system.
- Outside Cabinet & Door Cleaning: Wipe spills with soap and warm water.
- Ice Storage Bin Cleaning: Sanitize occasionally using a solution of household bleach and hot water. Biofilm can accumulate in the drain system, leading to low production and standing water, requiring frequent sanitizing.
- Condenser Cleaning: The condenser (similar to a car radiator) can become clogged with dirt and lint. It should be vacuumed regularly, especially in outdoor installations where leaves and other vegetation can obstruct fins. The front service panel and kickplate must be removed for access.
- Ice Making System Cleaning (Scale Removal):
- Remove all ice.
- Turn off the machine by holding the On/Off button for 3 seconds.
- Initiate cleaning mode by holding both Clean-Reset and On/Off buttons for 5 seconds (Time to Clean light blinks).
- Pour 8 ounces of Scotsman Ice Machine Scale Remover into the reservoir.
- Operate the machine for approximately ½ hour.
- Flush the cleaning solution by pushing and releasing the On/Off switch.
- Operate for another 1½ hour.
- Stop the cleaning process by pushing and releasing the On/Off switch.
- Pour a gallon of hot water (95°F - 115°F) into the bin to flush the drain.
- Winterizing:
- Clean the ice making system.
- Turn off the machine and water supply.
- Drain the water reservoir by removing the rubber cap.
- Disconnect the incoming water line at the inlet water valve.
- Blow air through the inlet water valve until water stops flowing.
- For drain pump models, pour about ½ gallon of RV antifreeze (propylene glycol) into the ice storage bin drain (automotive antifreeze must NOT be used).
- Switch off and unplug the machine.
- Troubleshooting: The manual provides guidance for common issues such as incompletely formed ice cubes (clean ice making system), low capacity (check drain, clean condenser fins), no ice (check on-off switch, electrical breaker, water supply, air temperature), Time to Clean light on (clean ice making system), and erratic drain pump operation (clean and sanitize bin, contact service if problem persists).
- Water Quality Impact: The manual explains how dissolved minerals in water can lead to scale buildup and malformed ice cubes, emphasizing the need for regular acid cleaning. It also notes that softened water may not always improve conditions for ice machines.
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