Scotsman CU0515 Cuber Ice Machine

Introduction

This manual provides the specifications and step-by-step procedures for the installation, startup, operation, maintenance, and cleaning of the CU0515 ice machine. It is important that installation and maintenance be conducted as outlined in this manual to retain the safety and performance built into the machine.

WARNING: Cancer and Reproductive Harm - P65Warnings.ca.gov

Specifications

The ice machine must be installed indoors in a controlled environment.

Operating the ice machine outside of the above limitations, or outdoors, is potentially damaging and constitutes misuse, which may void the warranty.

Scotsman Ice Systems are designed and manufactured with the highest regard for safety and performance, meeting or exceeding standards from agencies like NSF and UL.

Scotsman assumes no liability for products altered in any way or for the use of non-approved components. Scotsman reserves the right to make design changes and improvements at any time without notice.

Unpacking and Inspection

1. Call your authorized SCOTSMAN Distributor or Dealer for proper installation.
2. Remove the front panel and inspect for any concealed damage. Notify the carrier of any concealed damage claims.
3. Check that refrigerant lines do not rub against other lines or surfaces, and that the fan blade moves freely.
4. Check that the compressor fits snugly onto its mounting pads.
5. Remove all internal support packing and masking tape.

General Information and Installation

This model is supplied pre-wired and requires only electrical power connections to the provided cord. Ensure the ice machine is connected to its own circuit and individually fused (check data plate for maximum fuse size). It is a cord-connected unit designed for 115 volt AC power, with a maximum fuse size of 15 amps.

Low voltage can cause improper operation and serious damage not covered by warranty.

NOTE: All external wiring must conform to national, state, and local standards and regulations. Check voltage on the line and the ice maker's data plate before connecting. Extension cords must not be used.

Location Considerations

If the unit is built into a cabinet with no side ventilation, ice production will be reduced by 20%. Restricted space (e.g., one inch on each side) will cause a 10% reduction. Six inches of space on the left and right sides will allow satisfactory operation.

Warranty

The warranty statement is provided separately. It generally covers defects in material or workmanship but excludes maintenance, installation corrections, or operation outside specified limitations.

Daily ice-making capacity is related to condenser air inlet temperature, water temperature, condenser air filter condition, and machine age. Periodic maintenance checks are crucial for peak performance.

Water Supply and Drain Connections

General

When choosing the water supply, consider:

• Length of run
• Water clarity and purity
• Adequate water supply pressure (below 20 psi may cause malfunction)

Water with excessive minerals can produce cloudy ice and scale build-up.

Water Supply

The recommended water supply line is a 3/8" o.d. copper tube with a minimum incoming pressure of 20 psig. Connect tubing to the 3/4" GAS / BSPP thread water inlet fitting at the back of the ice maker. Adapters available: F733219-03 and F640134-00.

Water Drain

The recommended drain tube is a plastic or flexible tube with 18 mm (3/4") I.D., running to an open, trapped, and vented drain. A short length of 3/4" ID vinyl tubing is required to connect a rigid drain tube to the 20 mm (25/32") fitting on the back of the machine.

NOTE: Water supply and drain must conform to local codes. A licensed plumber and/or permit may be required.

[Diagram: Back View of Utility Connections showing Water Inlet Connection and Water Drain Connection]

Final Check List

1. Is the unit in a room where ambient temperatures are above a minimum of 10°C (50°F), even in winter?
2. Is there at least 15 cm (6") clearance around the unit for proper air circulation?
3. Is the unit level? (IMPORTANT)
4. Have all electrical and plumbing connections been made, and is the water supply shut-off valve open?
5. Has the voltage been tested and checked against the data plate rating?
6. Has the water supply pressure been checked to ensure at least 20 psi?
7. Check all refrigerant lines and conduit lines for vibrations and possible failure.
8. Have the bolts holding the compressor been checked to ensure it is snugly fitted onto the mounting pads?
9. Have the bin liner and cabinet been wiped clean?
10. Has the owner/user been given the User Manual and instructed on the importance of periodic maintenance checks?
11. Has the Manufacturer's registration card been filled in properly? Check model and serial number against the serial plate and mail to the factory.
12. Has the owner been given the name and phone number of the authorized SCOTSMAN Service Agency serving them?

Operating Instructions

Start Up

After correct installation and connections, perform the following start-up procedure:

1. Remove the condenser air filter, then remove the front panel. Locate the cleaning switch on the control box.
2. Switch the cleaning switch to the cleaning position. This closes the circuit to the water inlet valve and hot gas valve.
3. Switch the power ON and push the green button switch. The unit will start in charging cycle mode. Components energized: Water Inlet Solenoid Valve, Hot Gas Solenoid Valve, Water Pump, Fan Motor.
4. Operate in the water charging cycle for about three to four minutes until water flows from the drain hose. Then, move the cleaning switch to the operation position.

NOTE: During the charging cycle, the water inlet solenoid valve is energized, allowing water to fill the ice machine sump for the next freezing cycle.

[Image: Air Filter Removal]

[Image: Front View With Front Panel Removed showing Cleaning Switch and Green Power Switch]

Operational Checks

The unit starts its first freezing cycle with the Compressor, Water Pump, and Fan Motor operating.

Freeze Cycle Checks:

• Look through the ice discharge opening to confirm the spray system is correctly seated and water jets uniformly reach the inverted cup molds. Ensure the plastic curtain hangs freely and excessive water is not flowing through it.
• During the freeze cycle, the evaporator removes heat from the water, and warm air is discharged from the cabinet.
• The freezing cycle ends and starts the defrost/harvest cycle when the evaporator temperature reaches a preset value, changing the evaporator thermostat or cube size control contacts.
• Freezing time is typically 20-22 minutes at 70°F ambient temperature; longer at higher temps, shorter at lower temps. Average complete cycle is 23-25 minutes.
• During the first defrost/harvest cycle, check that incoming water correctly fills the sump and surplus water overflows through the drain tube.
• Check the size and shape of released ice cubes. Correct size has a small depression (approx. 3/16") in their crown. Adjustments, if needed, should be made after the second defrost/harvest cycle.
• If required, adjust the freezing cycle length using the cube size control or evaporator thermostat knob until the correct ice cube size is achieved.

If ice cubes are shallow and cloudy, the ice maker may be short of water during the freezing cycle, or the water quality may require a filter or conditioner.

Harvest Cycle Checks:

• During the defrost or harvest cycle, hold ice cubes against the storage bin thermostat bulb; the machine should switch OFF in one to two minutes.
• Remove ice from the storage bin; the ice maker should restart automatically in three to four minutes.
• NOTE: The bin thermostat is factory set at 1°C (35°F) OUT and 4°C (39°F) IN.
• Re-attach the front panel. Instruct the owner/user on general operation, cleaning, and care.

[Diagram: Ice Cube Shapes]

• Normal Size and Shape: Small Indent
• Cube too Small: Shallow Cube
• Oversized: Thick Bulge

Component Description

Water Pump

Operates continually during the freezing cycle, forcing water from the sump to the spray system and nozzles to form ice cubes.

Water Inlet Solenoid Valve

Energized only during the defrost cycle. It meters incoming water to assist the hot gas in defrosting ice cubes. Water flows over the evaporator cavity and into the sump through weep holes.

Hot Gas Solenoid Valve

Located on the hot gas line, energized by the evaporator thermostat contacts (3-2) during the defrost cycle. It allows hot gas from the compressor to flow into the evaporator serpentine to defrost ice cubes.

Bin Thermostat

Located in the front control box. Its sensing tube is in the ice storage bin. It automatically shuts OFF the machine when ice contacts it and restarts it when ice is removed. Factory settings: 1°C (35°F) OUT, 4°C (39°F) IN.

Cube Size Control (Evaporator Thermostat)

Located in the front control box. It's a reverse-acting temperature control that closes contacts 3-2 when temperature decreases and contacts 3-4 when temperature rises.

[Diagram: Water Circuit, Freeze Cycle]

[Diagram: Water Circuit, Harvest Cycle]

Operation - Electrical Sequence

The following charts illustrate switch and component states during the icemaking cycle.

Freezing Cycle

Harvest Cycle

Cleaning Switch

The cleaning switch, located on the bottom side of the control box, energizes the water inlet and hot gas valves to fill the machine's sump with water.

Controls

• Green Master Switch Push Button: Located on the front, used to switch the unit ON/OFF. The green light indicates ON status.
• Red Alarm/Re-Set Push Button: Located beside the Master Switch. It works with the Cleaning Reminder Board and is activated by:
• Steady ON (machine OFF): Condensing temperature higher than 70°C (158°F) (air cooled).
• Blinking Twice (machine OFF): Condenser sensor out of order.
• Steady ON (machine ON): Condenser air filter needs cleaning.
• Slow Blinking (machine ON): Water system needs cleaning.
• To reset after a high-temperature alarm, push and hold the Red Alarm Re-Set Button for 5 seconds until the red light turns OFF.
• For a condenser sensor error, replace the sensor, then push and hold the Red Re-Set Button for 5 seconds.

Cleaning Reminder PC Board

Located on the front left side, it works with the condenser sensor and Red Alarm/Re-Set Push Button. It includes a Printed Circuit Board, relay, dip switches, jumper, and connectors.

Its main function is to shut OFF the machine when condensing temperature is too high or signal the need for cleaning. The cleaning reminder interval (water system) can be set via dip switches:

After cleaning the water system, push and hold the Red Alarm Re-Set Button for over 20 seconds until it blinks to reset the control.

Condenser Air Filter

Located in front of the air-cooled condenser. Remove by pulling through the front panel opening for cleaning or replacement. A plastic guide aids sliding and location.

Condenser Sensor

Located within the condenser fins, it detects temperature variations and signals the P.C. BOARD. If the temperature rises to 70°C (160°F), the control system stops the machine's operation.

Service Diagnosis

Troubleshooting common symptoms:

Maintenance and Cleaning Instructions

General

Maintenance and cleaning procedures are guides and may vary based on local water, ambient conditions, and ice volume. Each machine requires individual maintenance.

Ice Machine Maintenance (Schedule at least twice per year):

1. Check and/or replace the water filter (if used).
2. Check that the ice machine is level side-to-side and front-to-rear.
3. Check for water leaks and tighten drain line connections. Pour water down the bin drain line to ensure it is open and clear.
4. Check ice cube size, condition, and texture. Adjust cube size control as needed.
5. Check the bin thermostat for shut-off: Place a scoop of ice cubes against the thermostat bulb for at least one minute. The machine should shut off. It should restart within seconds after ice removal.
6. NOTE: The bin thermostat is factory set and should not be reset until tested.
7. Check for refrigerant leaks.

NOTE: The unit is equipped with an air condenser filter and a Cleaning Reminder Board (Red Alarm Light) to signal the need for filter or water system cleaning.

Clean - Replace Of Air Condenser Filter

1. Withdraw the air filter from the front through the panel opening.
2. Remove the front panel.
3. Blow pressurized air against the condenser air flow to remove dust. Alternatively, use tap water in the counter-flow direction. Shake off excess water and dry with a hair dryer.
4. NOTE: Replace a damaged air filter strainer.
5. Return the front panel to its normal position.
6. Install the filter by pushing it through the front panel opening.

Cleaning Water System

Follow these steps for cleaning and sanitizing the water system.

1. Remove ice from the bin.
2. Remove the air filter and front panel.
3. Rotate the control knob counter-clockwise to the Off position.
4. Turn off the water supply.
5. Remove the top panel.
6. Remove the plastic panel (evaporator cover).
7. Remove the clamp and drain cap from the bottom of the reservoir; allow water to drain.
8. [Image: Remove Drain Cap showing clamp and cap]
9. Return the drain cap and clamp to their original positions.
10. Mix approximately 3 ounces (1/10 liter) of Scotsman Clear 1 Scale Remover with 1.5 quarts (1.5 liter) of warm (95-115°F) potable water. Pour this solution over the evaporator section.
11. [Image: Pour Scale Remover Over The Evaporator Section showing tubing and cups]
12. CAUTION: Ice machine cleaner contains acids. Avoid skin contact; flush with water if contact occurs. Do not induce vomiting if swallowed; give water or milk. Call a physician immediately. Keep out of reach of children.
13. Return the evaporator cover removed in step 6 to its normal position.
14. Rotate the control knob to the Normal position.
15. Operate the machine with the cleaning toggle switch in the Operation position for 5 minutes.
16. Switch the cleaning toggle switch to the Cleaning position and operate for 1 minute.
17. Repeat steps 12 and 13 three times. After the third time, rotate the control knob counter-clockwise to the Off position.
18. Remove the evaporator cover. Pour hot water over the evaporator section. Return the evaporator cover to its original position.
19. Pour hot water into the bin to melt any ice and clean the drain. Wipe the bin interior with mild soap and hot water, then rinse with cold water.
20. To sanitize: Mix a locally approved sanitizer solution. A possible solution is 1 ounce of household bleach with 2 gallons of warm (95-115°F) water.
21. Remove the plastic panel (evaporator cover).
22. Remove the clamp and drain cap from the bottom of the reservoir; allow water to drain.
23. Return the drain cap and clamp to their original positions.
24. Pour sanitizer solution over the evaporator section. Spray or wash the bottom of the evaporator cover and edges of the evaporator section with the sanitizing solution.
25. Return the evaporator cover to its normal position.
26. Rotate the control knob to the Normal position.
27. Operate the machine with the cleaning toggle switch in the Operation position for 4 minutes.
28. Switch the cleaning toggle switch to the Cleaning position and operate for 1 minute.
29. Repeat steps 23 and 24 five times. After the fifth time, rotate the control knob counter-clockwise to the Off position.
30. Remove evaporator cover. Pour sanitizer solution over the evaporator section and wash or spray the evaporator cover bottom. Return evaporator cover to its original position.
31. Remove curtain, clamp, and drain cap from the reservoir bottom; allow water to drain. Return drain cap and clamp to original positions.
32. [Image: Remove Thumb Screw Holding Curtain]
33. [Image: Remove Curtain]
34. Thoroughly spray or wipe the interior of the ice storage bin, bottom of the evaporator cover, and the spray platform with the sanitizing solution.
35. Completely immerse the curtain in the sanitizing solution.
36. Return the evaporator cover and curtain to their original positions.
37. Reconnect water supply.
38. Rotate control knob to its original position. Switch the cleaning toggle switch to the Cleaning position for two minutes, then to the Operation position. Operate until one batch of ice is released. Pour warm water over the ice to melt it.
39. Return the front panel to its original position and secure with screws.