This document provides a service, installation, and care manual for Maxx Cold Upright Chillers and Freezers. It covers essential information for safe and efficient operation, including receiving and inspecting the equipment, technical specifications, installation guidelines, operational features, and maintenance procedures.
Function Description:
The Maxx Cold Upright Chiller & Freezer is a self-contained refrigeration unit designed for indoor use. It functions to maintain specific temperature ranges for either chilling (refrigerators) or freezing (freezers) various products. The units are equipped with a solid-state thermostat for precise temperature control and display. Refrigerators operate within a factory-set temperature range of 34° to 38°F, while freezers are set to -7° to -3°F. Both types of units feature an automatic defrost cycle to prevent ice buildup on the evaporator coil. Evaporator fans circulate air within the cabinet, and anti-condensation heaters on door frames work in conjunction with the compressor to prevent moisture accumulation. An on/off switch with a green indicator light is located on the front panel for easy operation.
Important Technical Specifications:
The manual provides specifications for two models: MXX-23R (Refrigerator) and MXX-23F (Freezer).
Both models have a storage capacity of 25 cubic feet, indicating they are designed for substantial storage needs. The electrical requirements (115V, 60Hz, single phase) are standard for many commercial applications.
Usage Features:
- Installation: Units are intended for indoor use only. The floor must be strong enough to support the total weight (up to 1500 pounds when fully loaded). Good air circulation is essential, with a recommendation of at least 2 inches from any wall and 12 inches of clear space above the unit.
- Leveling: The cabinet should be level from front to back and side to side for proper door alignment and performance. Units with legs have adjustable bullet feet, while units with casters require a level floor.
- Stabilizing: All models come with casters for mobility but must be stabilized with the front wheels locked during use.
- Internal Airflow: Proper air circulation inside the cabinet is crucial. Refrigerated air is discharged at the top rear, flowing to the bottom. Obstructions to this airflow can lead to evaporator coil freeze-ups, temperature loss, or water overflow. Shelves have a rear turn-up to prevent items from blocking the rear.
- Thermostat Control: A solid-state thermostat (Dixell brand) allows users to display and change the set point, initiate a manual defrost, and view alarm occurrences. The keyboard can be locked/unlocked to prevent accidental changes.
- Defrost Cycle: Refrigerators initiate a defrost cycle every 6 hours, turning off the unit until the coil temperature reaches 41°F or after 20 minutes. Freezers also have a 6-hour defrost cycle, turning off the unit and activating an electric heater until the coil temperature reaches 45°F or after 20 minutes.
- Alarm Signals: The thermostat displays various alarm messages (e.g., "P1" for room probe failure, "HA" for maximum temperature alarm, "dA" for door open) and indicates corresponding outputs. Users can view and reset recorded alarms.
Maintenance Features:
- Cleaning (Interior & Exterior): The interior and exterior can be cleaned with soap and warm water. For stubborn stains, a non-abrasive liquid cleaner or ammonia and water can be used. Always rub with the "grain" of the stainless steel to avoid marring. Abrasive cleaners, steel pads, wire brushes, or scrapers should never be used on stainless steel or plastic components.
- Stainless Steel Care: Stainless steel contains iron and chromium, forming a passive film that protects against corrosion. To prevent discoloration or rust, avoid cleaners containing chlorides (found in hard water, salts, and many household cleaners). If chloride-containing cleaners are used, rinse and dry thoroughly. Regular cleaning with soap and water, or non-abrasive cleaners for tough stains, is recommended. Stainless steel cleaners can restore and preserve the protective layer.
- Condenser Coil Cleaning: Regular cleaning of the condenser coil is critical for proper refrigeration performance. It is recommended every 90 days, or every 30 days if heavy dust, debris, or grease accumulates. Light dust can be removed with a brush, while heavier buildup may require a vacuum or compressed air. For heavy grease, de-greasing agents specifically for refrigeration use can be applied. Never use a high-pressure water wash, as it can damage electrical components. Failure to maintain a clean condenser coil can lead to high temperatures, excessive run times, compressor failures, and void any associated warranties.
- Gasket Maintenance: Gaskets should be cleaned regularly with warm soapy water to prevent mold, mildew, and maintain elasticity. Avoid full-strength cleaning products that can make gaskets brittle. Do not use sharp tools or knives to clean gaskets. Gaskets are "Dart" style and can be easily replaced by pulling them out of the groove and pressing new ones into place.
- Doors/Hinges: Over time, door hinges may become loose. Tighten the screws that mount the hinge brackets to the frame if the door sags to prevent damage to the hinges and frame.
- Drain Maintenance: Each unit has an internal drain that removes condensation from the evaporator coil to an external condensate evaporator pan. Ensure the drain tube is securely connected and located inside the drain pan. If water accumulates inside or underneath the unit, check the drain connections and ensure all drain lines are free of obstructions. A level unit is essential for proper drainage.
Safety Precautions:
- Always turn OFF and disconnect the unit from the power source before performing any service, maintenance, or cleaning tasks in the refrigerated area.
- If the unit needs to be laid on its side or back for any reason, allow at least 24 hours before start-up to allow compressor oil to flow back into place. Failure to do so can cause compressor failure and unit damage.
- Improper installation procedures will void standard unit warranties.
- Never throw items into the storage area, as this can damage the interior.
- Never use acid-based cleaning solutions on stainless steel surfaces, as many food products also have acidic content that can deteriorate the finish. Clean all food products from stainless steel surfaces.
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