UN324

Overview

The Scotsman UN324 is a self-contained undercounter nugget ice machine with built-in storage. It produces Scotsman H2 Nugget Ice: chewable, slow-melting pieces measuring 3/4 x 5/16 x 3/8 inch (1.9 x 0.8 x 0.95 cm). The manufacturer identifies healthcare, foodservice and school applications as suitable uses. The cabinet is 24 inches wide, and its bin holds up to 80 lb (36 kg) of ice.

The UN324 family is offered with air- or water-cooled condensing. Production depends on the operating conditions: the specification sheet lists up to 340 lb (154 kg) in 24 hours at 70°F air and 50°F water. At 90°F air and 70°F water, listed production is 266 lb (121 kg) for air-cooled and 281 lb (127 kg) for water-cooled operation. These figures are production ratings under the stated conditions, not the bin storage capacity.

Key Features

• Compact undercounter format: The unit is 24 inches wide and has a listed cabinet height of 39 inches with the standard arrangement.
• Chewable nugget ice: Slow-melting H2 Nugget Ice is suitable for beverages and the healthcare, foodservice and school applications named by Scotsman.
• Accessible bin: A slide-back door provides access to stored ice. An ice scoop is included.
• Easy-to-access filter: The external air filter is at the front and is intended to make cleaning easier.
• Service access: A unit-specific QR code provides quick access to service manuals and warranty history.
• Simple controls: Scotsman describes the control panel as intuitive for quick operation.
• Durability and maintenance features: The machine has a stainless steel evaporator and greaseless bearing. Scotsman describes the sealed bearings as maintenance-free.
• Refrigerant: The specification sheet lists non-ozone-depleting R290 refrigerant.
• Warranty: Scotsman lists 3 years of parts and labour coverage on all components and 5 years of parts coverage on the compressor for commercial installations in North, South and Central America. The manufacturer lists 1 year of parts and labour coverage for residential applications.

Specifications

• Product type: Self-contained undercounter nugget ice machine with storage.
• Condenser options: Air-cooled or water-cooled.
• Ice type: H2 Nugget Ice; 3/4 x 5/16 x 3/8 inch (1.9 x 0.8 x 0.95 cm).
• 24-hour production: Air-cooled: 340 lb (154 kg) at 70°F air/50°F water; 266 lb (121 kg) at 90°F air/70°F water. Water-cooled: 340 lb (154 kg) at 70°F air/50°F water; 281 lb (127 kg) at 90°F air/70°F water.
• Storage capacity: 80 lb (36 kg).
• Dimensions: 24 W x 28.5 D x 39 H inches (61.0 x 72.4 x 99.1 cm).
• Shipping carton dimensions: 28.75 W x 38.65 D x 39 H inches (73.0 x 98.2 x 99.1 cm).
• Shipping weight: 210 lb (95 kg).
• Electrical: 115 V, 60 Hz, single phase. The specification sheet lists a 15 A breaker for all models.
• Energy consumption: 4.92 kWh/100 lb for the air-cooled version and 4.10 kWh/100 lb for the water-cooled version, at 90°F air/70°F water.
• Potable water usage: 12.0 gallons (45.5 L) per 100 lb (45.4 kg), as listed on the specification sheet.
• Water pressure: 20 to 80 PSIG (1.4 to 5.5 bar).
• Operating temperature ranges: Air temperature 50°F to 100°F (10°C to 38°C); water temperature 40°F to 100°F (4.4°C to 38°C).
• Water conductivity: Minimum 10 micro Siemens/CM.
• Refrigerant: R290. Listed refrigerant charges are 5.25 oz for the air-cooled version and 4.5 oz for the water-cooled version.
• Heat output: 3,000 BTU per hour.
• Included items: Ice scoop, power cord and 6-inch adjustable legs.
• Optional accessories: A leg kit, caster kit and floor mount kit are listed. The KUFM24 floor mount kit lowers the unit height to 33.5 inches (33.4 inches in the accessory listing).

Installation & Requirements

The technical manual covers placement, installation, startup and operational checks. The manufacturer’s checklist identifies indoor installation, and the manual states that no additional spacing is required at the top or sides. For air-cooled models, the specification drawing identifies an air inlet and air exhaust; the technical information indicates that air is drawn in at the right grill. Keep the specified airflow path in mind when locating the machine.

Connect the unit to the water supply and drain using the connections shown in the specification drawing: a 3/8-inch flare water inlet and a 3/4-inch FPT unit drain. The drawing also identifies a 3/8-18 NPT condenser water inlet and a 1/2-14 NPT condenser water drain connection for water-cooled configuration. The manufacturer recommends water filtration for all ice machines and says the water supplied to the machine should be filtered.

The listed electrical supply is 115 V, 60 Hz, single phase, and the specification sheet lists a 15 A breaker. The operating requirements specify water pressure from 20 to 80 PSIG, air temperature from 50°F to 100°F, and water temperature from 40°F to 100°F. Confirm the selected condenser configuration and site connections against the current Scotsman technical documentation before installation.

Operation

The control panel is described as intuitive, and the slide-back door gives access to the ice bin. The machine’s photo-eye ice-level control is identified in the supplied product information. Production varies with incoming water and surrounding air conditions, so use the published production figures with their stated temperature conditions when planning output against demand. The 80 lb bin capacity is the amount stored at one time; it is separate from the 24-hour production rating.

The technical manual describes a controller test mode. Its stated entry sequence is to press and hold the ON/OFF button while also pressing and holding the CLEAN button. The supplied manual extract does not give the subsequent test sequence or explain the functions available in that mode, so use the full model manual or a commercial service technician for diagnostic procedures.

Cleaning & Maintenance

Scotsman identifies an external, front-accessible air filter for easier cleaning and recommends filtered water for the ice machine. The technical manual contains sections on maintenance and cleaning, condenser and air-filter cleaning, and scale removal from the ice-making system. The supplied manual text does not include the full cleaning steps or a service interval, so follow the current UN324 manual for the correct procedure rather than applying a generic schedule.

The greaseless bearing is specified as a maintenance-reduction feature, and Scotsman describes the bearings as sealed and maintenance-free. The stainless steel evaporator is identified as a durability feature. The unit-specific QR code provides access to service manuals and warranty history. For service, Scotsman’s manual directs owners and technicians to use its technical resources and recommends a commercial service company for this commercial product.

Troubleshooting

The technical manual includes basic troubleshooting and controller diagnostic sections. The supplied extracts identify a high-pressure cutout at 230 PSIG with automatic reset. They also flag irregular water flow as a factor relevant to troubleshooting. These details identify conditions the controller or technician may consider; they are not a complete diagnostic procedure.

The provided troubleshooting extract mentions a possible false bin-full indication and begins a check for the situation where the bin is not full but the display shows “b.” It does not preserve the corresponding corrective steps. For a persistent bin-full indication, operating fault or service diagnosis, refer to the complete UN324 technical manual or contact a commercial service technician. Avoid treating the test-mode button sequence as a general reset instruction; the supplied documentation does not identify it as a reset procedure.

Applications

The manufacturer names healthcare, foodservice and schools as applications for the UN324’s chewable, slow-melting nugget ice. Its undercounter cabinet and built-in 80 lb bin make it a fit for operations that need ice production and storage in a compact footprint. When assessing suitability, compare expected demand with the production rating for the site’s air and water temperatures, as well as the available bin capacity.