Scotsman Ice Systems - Service Manual

Introduction

This manual provides detailed information for the service and maintenance of Scotsman Cube Ice Machines, models CU0415X, CU0715X, and CU0920X. These machines are the result of years of experience in developing commercial ice cube machines and are designed for simple operation in various locations.

Table of Contents

Important Details, Pre-Installation, Cabinet Layout, Component Location, Connecting Water Supply, Connecting Power, Control Panel and Adjustments, Initial Start Up, Use and Operational Notes, Maintenance, Electrical Sequence, Components, Performance, Thermistor Values, Controller Use, Anti-Slush, Controller Self Test, Service Diagnosis, Removal and Replacement, Controller, Cabinet Removal for Service, 115/60/1 Wiring Diagram.

Important Details

The machine is designed for indoor use in a controlled environment. It must be kept dry, not overheated, or subjected to excessive cold. Water and power supply must be maintained for proper operation.

• Air Temperature Limits: Minimum 50°F (10°C), Maximum 100°F (38°C).
• Water Temperature Limits: Minimum 40°F (4.5°C), Maximum 100°F (38°C).
• Voltage Supply: Varies by model (e.g., 115V, Minimum 104V, Maximum 126V).
• Water Pressure Limits: Static: 80 psi (5.5 bar), Dynamic: 15 psi (1 bar).
• A drain is required for melted ice and rinse water.

Warranty: Refer to the separate warranty statement for coverage details. Alterations or part substitutions will void the warranty.

Options: Two floor mounting kits are available: KUFM15 (for 15" models) and KUFM20 (for 20" models).

Pre-Installation

This appliance is intended for commercial applications such as restaurant kitchens, bars, and hotels.

• Spacing: Minimum side clearance of 1/8 inch (3 mm), minimum top clearance of 1/4 inch (7 mm). Allow 4 inches (100 mm) at the back for utility connections. Do not block front louvers.

Dimensions and Electrical:

Location: The unit can be built into a cabinet as airflow is from the front. Ensure front is not blocked. Plan for service access to top, back, and side panels.

Unpacking and Setup: Remove all packing materials. The unit can be installed with or without legs. If legs are removed, allow 1 hour for oil to settle before starting. Ensure the machine is level. If legs are not used, seal the bottom edges to the floor.

Cabinet Layout

Diagrams illustrating the cabinet dimensions and connection points (power cord, water inlet, drain) for CU0415X/CU0715X and CU0920X models are provided.

Component Location

Key components are identified in a diagram:

• Curtain
• Cube Deflector
• Bin Thermostat Sensing Point
• Drain Plug
• Condenser Fins
• Control Area
• Condenser Fan
• Thermostat
• Bin Thermostat Adjustment
• Controller

Connect the Water Supply

Plumbing Information:

• Water supply connection is at the back panel, using a 1/4 inch (6.35 mm) OD plastic tube.
• A hand-actuated valve near the machine is required for isolation.
• The machine has a built-in backflow preventer.
• Water flow rate: 0.25 GPM / 0.94 LPM.
• For cabinet installations, include a loop or coil of tubing to prevent kinking.

Connection Information:

• Connect to potable water supply only.
• Flush the water connection point before connecting the machine.
• Use appropriate adapters for the 1/4 inch OD plastic tube. Avoid piercing-type saddle valves.

Connect the Drain:

• The drain connection is 3/4" FPT at the back panel.
• Connect rigid tubing, slope it downwards at least 1/4 inch per foot (20 mm per meter).
• Vent the vertical tube for the vent.
• Insulate drain tubing to reduce condensation. Condensate pumps are not recommended due to leak potential.

Connect the Power

Connect to a dedicated power supply. Check the dataplate for voltage and fuse/breaker requirements. Use the provided cord and plug. Follow all local codes, including grounding. Do not use extension cords or bypass the ground prong.

Installation Check List:

• Machine installed indoors in a suitable environment?
• All shipping and packaging removed?
• Plastic covering removed from exterior panels?
• Ice chute in correct position?
• Clear plastic curtain hanging freely?
• Water supply connected and leak-free?
• Properly sized and sloped drain tube attached?
• Correct voltage power supply connected?

Control Panel and Adjustments

The control panel features:

• Ice Bridge Thickness Adjustment Area: Use '+' and '-' buttons to adjust ice thickness. The factory setting is recommended. Do not make the bridge too thick or too thin.
• Harvest Time Adjustment Area: Adjust harvest cycle duration using '+' and '-' buttons. Proper time ensures ice release with a 10-second buffer.
• Master Switch: ON (make ice), OFF (shut down), WASH (cleaning).
• Indicator Lights: Indicate Freeze Mode and Timer status.

Ice Thickness Diagram: Illustrates 'Ice Too Thin', 'Ice Just Right', and 'Ice Too Thick' conditions.

Adjustment Indicator Lights: Lights indicate changes in ice size or harvest time. 10 settings available.

Initial Start Up

1. Remove front panel.
2. Turn on water supply, check for leaks.
3. Locate and set the master switch to ON.
4. Indicator lights will activate. The unit will fill with water and begin the freeze cycle.
5. The freeze cycle involves water spraying, compressor and hot gas valve energizing, followed by pump and fan motor operation.
6. A blue light indicates the freeze cycle. A yellow light indicates the final 7 minutes of the freeze cycle.
7. Ice harvest occurs after the freeze cycle.
8. Ice falls into the bin, restarting the freeze cycle.
9. Check ice bridge thickness (approx. 1/8 inch or 3-4 mm).
10. Adjustments can be made if the ice bridge is too large or small.
11. Ice making stops when the ice level reaches the bin sensor. Removing ice restarts the process.
12. Check for water leaks.
13. Reinstall the front panel.

Typical Cycle Times (minutes): Provided for different ambient temperatures.

Use and Operational Notes

• Lift the door to access ice. Use the scoop and close the door.
• Ensure adequate airflow around the machine for optimal performance.
• The storage bin is insulated but not refrigerated; ice may melt.
• The fan may cycle on/off in cold environments.
• The machine will not make ice in temperatures below the minimum listed.
• Minor adjustments can be made using the adjustment screw.
• For altitudes above 2000 ft (610 m), the bin thermostat may require internal adjustment (refer to table).

CAUTION: Do not stand on the machine. Supervise children.

Maintenance

Cleaning the Condenser:

• Regularly vacuum the condenser fins with a brush. Be careful not to damage fins.

Scale Removal:

Scale removal is recommended approximately twice per year.

1. Remove front panel.
2. Turn the master switch Off, then On.
3. When the freeze cycle begins, switch to Off.
4. Remove and discard ice.
5. Drain the reservoir.
6. Mix Scotsman Clear Scale Remover solution with clean, warm water.
7. Pour solution into the reservoir.
8. Set master switch to Wash for 10 minutes.
9. Turn master switch to Off.
10. Drain the reservoir.
11. Clean the spray platform and cube chute.
12. Rinse the reservoir with warm water.
13. Set master switch to Wash for 1 minute, then Off.
14. Drain the reservoir.
15. Turn master switch to On to resume ice making.
16. Return front panel.

Sanitize Water System:

1. Mix a sanitizer solution with clean, warm water.
2. Pour half the sanitizer into the reservoir.
3. Wash cube chute and spray platforms with sanitizer.
4. Set master switch to Wash for 2 minutes.
5. Turn master switch to Off.
6. Drain the reservoir.
7. Wash interior surfaces of the bin and reservoir with remaining sanitizer.
8. Rinse the reservoir with warm water.
9. Set master switch to Wash for 1 minute, then Off.
10. Drain the reservoir.
11. Turn master switch to On.
12. Return front panel.

Cleaning the Condenser:

1. Remove front panel.
2. Switch machine to OFF.
3. Vacuum condenser fins, brush off dirt. Use coil cleaner for grease.
4. Switch machine to ICE.
5. Return front panel.

Electrical Sequence

Proper voltage and a closed bin thermostat are required for power. The sequence describes the operation during initial power-up, freeze cycle, and harvest/defrost mode. Indicator lights (blue, yellow, red) signal different stages.

WARNING: Disconnect electrical power before servicing.

Components

• Compressors: Three capacities, Embraco brand.
• Condenser: Air-cooled, forced draft, copper and aluminum.
• Evaporator: Nickel-plated copper, inverted grid.
• Ice: Medium / Full Dice cube.
• Metering device: Capillary tube.
• Refrigerant: R-134a.
• Refrigerant Charge: 8 ounces (all models).
• Fan motor: Varies by model (2.3 watts or 6 watts).
• Fan pressure control switch: Opens at 100 PSIG, closes at 150 PSIG.
• Water pump: OEM.
• Hot gas valve: Ported, line voltage coil.
• Inlet water solenoid valve: 0.275 GPM flow, line voltage coil.
• Transformer: Output 12 volt AC.
• Controller: Microprocessor-operated, adjustable bridge thickness and harvest time.
• Sensors: Thermistors for suction line and reservoir water temperature.
• Bin Thermostat: Opens on temperature fall, operates compressor directly.
• Master switch: On, Off, or Wash.

Performance

Details compressor amp draw and drain water per cycle for CU0415X, CU0715X, and CU0920X models under various conditions.

Thermistor Values

A table provides resistance values (Ohms) for various temperatures (°F) for the thermistors.

Controller Use

Explains the function of the controller's LED lights and adjustments for Bridge Thickness and Harvest Time. The controller ships set for CU0715X and requires adjustment for other models.

Anti-Slush

The anti-slush feature prevents slush in the reservoir by temporarily shutting off the water spray to the evaporator. A light on the back of the controller indicates when this mode is active.

Controller Self Test

Provides a step-by-step routine for testing the controller's functions, including thermistor tests, relay tests, and EEPROM read/write tests. Includes a table for test results and actions if a failure occurs.

Service Diagnosis

A troubleshooting guide lists common problems, their possible causes, and probable corrections. Categories include:

• No ice
• No ice, nothing operating
• No ice, compressor and fan on, pump not spraying water
• No ice, pump spraying, fan motor and compressor off
• No ice, pump spraying, compressor on, fan motor not turning
• Makes ice but ice is cloudy or not completely formed
• Makes ice but makes blocks or shells
• Makes ice but does not hold bridge setting
• Makes ice but does not fill the bin
• Unit makes ice but it is wet
• Makes ice but is slow, cannot keep up
• Makes ice but is loud
• Door binds opening or closing
• Bin overfills

Removal and Replacement

Detailed procedures for removing and replacing components:

• Curtain: Steps for removal and installation.
• Cube Deflector: Steps for removal and installation.
• Pump: Steps for removal and installation.
• Spray Platform: Steps for removal and installation, including service procedures.
• Bin Thermostat: Steps for removal and installation.
• Inlet Water Solenoid Valve: Steps for removal and installation.
• Controller: Steps for removal and installation, including adjustment for different models.

Cabinet Removal for Service

Provides instructions for removing cabinet panels to access internal components for servicing.

115/60/1 Wiring Diagram

A wiring diagram illustrates the electrical connections for the unit.