This document serves as a service manual for Scotsman EC series cuber ice machines, specifically models EC 46, EC 56, and EC 86. These machines are designed to produce ice cubes and are available in various configurations, including air-cooled and water-cooled versions, with different production capacities and storage bin options.

Function Description

The Scotsman EC series ice makers are self-contained units that produce ice cubes through a continuous freezing and harvesting cycle. Water is supplied to the evaporator, where it freezes into cubes. Once the cubes reach the desired thickness, a hot gas cycle is initiated to release them into a storage bin. The machines are designed for efficiency and reliability, incorporating features that ensure consistent ice production and ease of maintenance.

The ice-making process involves several key components: a compressor, a condenser (air or water-cooled), an evaporator, a water pump, and various sensors and control systems. The water pump circulates water over the evaporator plate, where it freezes into cubes. The compressor circulates refrigerant through the system, facilitating the heat exchange necessary for freezing and harvesting. During the harvest cycle, hot gas is directed to the evaporator to warm it slightly, releasing the ice cubes into the storage bin.

The machines are equipped with a PWD (Pump Out Water Drain) system, which manages the water in the sealed water reservoir. This system includes a sealed water tank, a PC Board & Sensor, a sealed water pump, and a check valve. The pump out water drain system ensures that all water coming from the overflow and from the melted ice is collected inside the sealed water reservoir. The PC Board activates the water drain pump for a set duration to pump out most of the water, preventing mineral buildup and ensuring clean ice production.

Important Technical Specifications

The EC series ice makers come with various specifications depending on the model and cooling type:

General Operating Requirements:

Air Temperature: Minimum 10°C, Maximum 40°C
Water Temperature: Minimum 5°C, Maximum 35°C
Water Pressure: Minimum 1 bar, Maximum 5 bar
Electrical Voltage Variations: -10% to +10% from voltage rating specified on nameplate

Model-Specific Dimensions and Weights:

EC 46:
- Height (with legs): 778 mm (30 5/8 in)
- Height (without legs): 693 mm (27 1/4 in)
- Width: 386 mm (15 3/16 in)
- Depth: 600 mm (23 5/8 in)
- Weight: 42 Kgs (92.6 lbs)
EC 56:
- Height (with legs): 829 mm (32 5/8 in)
- Height (without legs): 693 mm (27 1/4 in)
- Width: 386 mm (15 3/16 in)
- Depth: 600 mm (23 5/8 in)
- Weight: 45 Kgs (99.2 lbs)
EC 86:
- Height (with legs): 785 mm (30 7/8 in)
- Height (without legs): 650 mm (25 5/8 in)
- Width: 530 mm (20 7/8 in)
- Depth: 590 mm (23 1/4 in)
- Weight: 55 Kgs (121.3 lbs)

Ice Making Capacity (Kg/24 HR): The ice making capacity varies significantly with ambient and water temperatures. Generally, lower ambient and water temperatures result in higher ice production. The manual includes graphs illustrating the ice production for both air-cooled and water-cooled models across different ambient and water temperatures. For example, the EC 46 can produce between 27 and 38 kg/24hr depending on conditions. The EC 56 ranges from 27 to 43 kg/24hr, and the EC 86 from 29 to 39 kg/24hr.

Electrical Specifications: All models operate on 230/50/1 power supply.

EC 46: Start Amps: 12, Watts: 400, Electric power consumption: 6 Kwh per 24 Hr, Nr. of wires: 3 x 1.5 mm², Amps fuse: 10.
EC 56: Start Amps: 12, Watts: 400, Electric power consumption: 7.6 Kwh per 24 Hr, Nr. of wires: 3 x 1.5 mm², Amps fuse: 10.
EC 86: Start Amps: 18, Watts: 480, Electric power consumption: 8.9 Kwh per 24 Hr, Nr. of wires: 3 x 1.5 mm², Amps fuse: 10.

Refrigerant Charge (R 134 A):

EC 46: Air cooled: 260 gr (9.5 oz.), Water cooled: 250 gr (9.0 oz.)
EC 56: Air cooled: 260 gr (9.5 oz.), Water cooled: 250 gr (9.0 oz.)
EC 86: Air cooled: 280 gr (10.0 oz.), Water cooled: 250 gr (9.0 oz.)

Bin Capacity:

EC 46: 9 Kg.
EC 56: 12.5 Kg.
EC 86: 19 Kg.

Water Requirements:

EC 46: Water res. l/24 HR: 350*
EC 56: Water res. l/24 HR: 270*
EC 86: Water res. l/24 HR: 500*
*A 15°C water temperature

Usage Features

Installation: Proper installation is crucial for optimal performance and longevity. The manual provides detailed instructions for unpacking, leveling, electrical connections, water supply, and drain connections. Key considerations include:

Location: The ice maker should be placed in a location with adequate air circulation and away from heat sources. Minimum room temperature is 10°C (50°F) and maximum room temperature is 40°C (100°F).
Water Supply: Connect to a potable water supply with appropriate pressure (1-5 bar). A water filter is recommended.
Drainage: Ensure proper drainage for both the water supply and the ice maker's internal drain system. The recommended drain tube is a plastic or flexible tube with 18 mm (3/4") I.D., which runs to an open trapped and vented drain.
Electrical Connection: All Scotsman ice machines are supplied from the factory completely pre-wired and require only electrical power connections to the wire cord provided at the rear of the unit.

Operating Instructions: The machines are designed for automatic operation. Once connected to power and water, the unit will start its freezing and harvest cycles.

Start-up: After installation, the unit should be started according to the procedure outlined in the manual, which includes checking for leaks and ensuring all connections are secure.
Operational Checks: Regular checks include verifying the freezing and harvest cycles, water levels, and overall performance.
Ice Cube Size Adjustment: The size of the ice cubes can be adjusted by turning a knob on the front control box. Turning clockwise increases cube size, while counter-clockwise decreases it.
Bin Level Adjustment: The bin level control can be adjusted to produce more or less ice in the bin.

Maintenance Features

Regular maintenance is essential to ensure the ice maker operates efficiently and produces clean, high-quality ice. The manual outlines a comprehensive maintenance schedule and procedures.

Maintenance Schedule: The following maintenance should be scheduled at least two times per year on these ice makers:

Check and clean the water line strainer.
Check that the icemaker is levelled in side to side and in front to rear directions.
Check for water leaks and tighten drain line connections. Pour water down the drain line to be sure that drain line is open and clear.
Check size, condition and texture of ice cubes. Perform adjustment of cube size control as required.
Check the bin thermostat to test shut-off. Put a shovel full of ice cubes in contact with the bin thermostat bulb for at least one minute. This should cause the ice maker to shut off.
Check for refrigerant leaks.

Cleaning Instructions:

Clean/Replace Air Condenser Filter (Air Cooled Models): The air filter should be cleaned regularly (at least twice a year, or more frequently in dusty environments) to ensure proper airflow to the condenser. This involves removing the filter from the front panel and cleaning it with a brush or vacuum cleaner.
Cleaning Water System: The water system should be cleaned regularly to prevent mineral buildup and ensure hygienic ice production. This involves:
- Removing the front and top panels to gain access to the control box and evaporator.
- Turning OFF the ice maker at the master button switch.
- Scooping out all ice cubes from the bin.
- Removing the plastic cup located on the bottom of the sump/freezing chamber.
- Pouring a cleaning solution (diluted in warm water) into the sump/freezing chamber.
- Running the machine through a cleaning cycle (usually 10 minutes).
- Draining the cleaning solution and rinsing the system with clean water.
- Reassembling the components.
Sanitizing the Storage Bin: The storage bin should be sanitized every week to prevent the accumulation of undesirable bacteria. This involves wiping the inner surfaces of the storage bin with a sanitizing solution.

Troubleshooting (Service Diagnosis): The manual provides a detailed service diagnosis chart that lists common symptoms, possible causes, and suggested corrections. This helps users and technicians identify and resolve issues such as:

Unit will not run (blown fuse, main switch off, loose electrical connections).
Red alarm light ON (condensing temperature > 60°C, too high condensing temperature).
Red alarm light blinking (condenser sensor out of order).
Cubes too small (cube size control set improperly, capillary tube partially restricted, moisture in system, shortage of water/refrigerant).
Cloudy cubes (shortage of water, dirty water supply, accumulated impurities).
Poor harvest (restriction in incoming water line, too short defrost time, cube size control set too large, hot gas valve orifice restricted, air vented holes in mold cups plugged, discharge head pressure too low).
Unit won't harvest (inoperative cube size control, hot gas valve not opening, water solenoid valve not opening).
Incorrect discharge pressure (dirty air filter, inoperative high pressure control, water inlet valve to condenser partially clogged).
Excessive water in unit base (water tubing leaking).

The Scotsman EC series ice makers are designed to be robust and user-friendly, with clear instructions for both operation and maintenance to ensure long-term performance and reliability.

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