This document provides a comprehensive guide for the Kratos commercial reach-in refrigerators, covering models 69K-759, 69K-760, 69K-773, and 69K-761. It includes detailed instructions for service, installation, operation, and maintenance, ensuring safe and efficient use of the equipment.
Function Description
These units are commercial reach-in refrigerators designed for indoor use, providing reliable refrigeration for various food service environments. They are available in solid door (69K-759, 69K-773) and glass door (69K-760, 69K-761) configurations, with single or double door options. The refrigeration cycle ensures continuous operation of evaporator fans, even when doors are open, to maintain consistent temperatures. Solid door models feature lights activated by a door switch, while glass door models have manually operated lights. A key feature is the automatic defrost cycle, which occurs every 6 hours, allowing the evaporator coil to air defrost. The controller displays a defrost symbol during this period. The unit resumes normal operation once the coil temperature reaches 53°F (12°C) or after 30 minutes. Anti-condensation heaters on door frames work in conjunction with the compressor to prevent moisture buildup.
Important Technical Specifications
The Kratos refrigerators are designed to operate within a recommended holding temperature range of 34°F to 40°F (2°C to 5°C), with a factory preset temperature of 39°F (4°C). All models are self-contained and require a grounded 3-prong outlet for electrical connection.
- Models 69K-759 (Solid Door) and 69K-760 (Glass Door):
- Dimensions (W x D x H): 27 x 33.3 x 83.5 inches (686 x 846 x 2121 mm)
- Nominal Capacity: 19.3 cu ft / 547 L
- Unit Weight: 280 lbs / 127 kg
- Hinged Doors: 1
- Shelves: 3
- Electrical Service: 110V/60Hz/1Ph
- Wattage: 320 W
- Average Amp Draw: 1 (69K-759), 1.2 (69K-760)
- Refrigerant: R-134A
- Provided 6' NEMA Cord Set: 5-15
- Factory Temperature Setting: 39°F (4°C)
- Models 69K-773 (Solid Door) and 69K-761 (Glass Door):
- Dimensions (W x D x H): 54.1 x 33.3 x 83.5 inches (1374 x 846 x 2121 mm)
- Nominal Capacity: 42.9 cu ft / 1215 L
- Unit Weight: 470 lbs / 213 kg
- Hinged Doors: 2
- Shelves: 6
- Electrical Service: 110V/60Hz/1Ph
- Wattage: 520 W
- Average Amp Draw: 1.3 (69K-773), 1.6 (69K-761)
- Refrigerant: R-134A
- Provided 6' NEMA Cord Set: 5-15
- Factory Temperature Setting: 39°F (4°C)
The total height of the unit can be reduced by 2 inches with a set of shorter heavy-duty casters (2 with brakes).
Usage Features
The refrigerators are equipped with a solid-state thermostat for precise temperature control.
- Front Panel Commands (Units Made Prior to July 2018):
- SET button: Displays target set point, selects parameters, or confirms operations.
- Up/Down arrows: Browse parameter codes or adjust displayed values.
- Manual Defrost button: Initiates a manual defrost cycle (press for 5 seconds).
- ON/OFF button: Returns to the previous menu level, confirms parameter values, or activates the Standby function (press for 5 seconds outside menus).
- LED Indicators:
- Compressor enabled (On), short cycle delay (Flashing)
- Defrost in progress (On), manual/digital input activation (Flashing)
- Fans output enabled (On), fans delay after defrost (Flashing)
- Measurement unit (On), programming mode (Flashing)
- Alarm active (On), alarm acknowledged (Flashing)
- Front Panel Commands (Units Made After July 2018):
- SET button: Displays target set point, selects parameters, or confirms operations.
- Defrost button: Starts a manual defrost.
- Up/Down arrows: Browse parameter codes or adjust displayed values.
- Key Combinations:
- Up + Down: Lock or unlock the keyboard.
- SET + Down: Enter programming mode.
- SET + Up: Return to room temperature display.
- LED Indicators:
- Compressor enabled (On), anti-short cycle delay enabled (Flashing)
- Defrost in progress (On), dripping in progress (Flashing)
- Fans output enabled (On), fans delay after defrost (Flashing)
- Measurement unit (On), programming mode (Flashing)
- Alarm Signaling: The unit features various alarms (e.g., probe failure, maximum/minimum temperature, external alarm) indicated by an audible signal and a flashing icon. Alarms can be acknowledged by pressing any key, but the icon will continue to flash until the condition is resolved.
Maintenance Features
Regular maintenance is crucial for the longevity and efficient operation of the refrigerator.
- Exterior and Interior Cleaning: Use soap and warm water for routine cleaning. For stubborn stains, use a non-abrasive cleaner and plastic scrub pad. Avoid abrasive cleaners, sharp instruments, rubbing alcohol, or flammable fluids, as these can damage the unit's surface.
- Condenser Coil Cleaning: Regular cleaning (every 90 days) is recommended to prevent debris and grease accumulation, which can lead to compressor failure and reduced efficiency. Use a simple brush or vacuum cleaner for light dust. For heavy grease, use a de-greasing agent and compressed air.
- Stainless Steel Care: Clean stainless steel surfaces with soft cloths or plastic scouring pads, using alkaline-based or non-chloride-based cleaning solutions. Always rub with the grain of the steel. Rinse and dry thoroughly. Avoid acid-based cleaning solutions, as many food products contain acids that can deteriorate the finish.
- Gasket Maintenance: Clean gaskets regularly with warm soapy water to prevent mold and mildew and maintain elasticity. Avoid strong cleaning products and sharp tools. Gaskets are "Dart" style and can be easily replaced by pulling them out of the groove and pressing new ones into place.
- Doors/Hinges: Periodically check and tighten the screws that mount the hinge brackets to the unit frame to prevent sagging doors and potential damage to hinges.
- Drain Maintenance: The internal drain removes condensation to an external condensate evaporator pan. Ensure the drain tube is connected and free of obstructions to prevent water accumulation inside or underneath the unit. A level floor is also important for proper drainage.
Safety Precautions:
- Always plug into a grounded 3-prong outlet.
- Do not remove the grounding prong or use adapters/extension cords.
- Disconnect power before cleaning or servicing.
- Use two or more people to move and install the refrigerator due to its weight.
- Ensure proper ventilation with ambient temperatures between 50°F (10°C) and 100°F (38°C).
- Install the unit in an area protected from elements like wind, rain, or water spray.
- Do not locate the refrigerator near heat sources like ovens or grills.
- Allow at least 24 hours after laying the unit on its side or back before start-up to allow compressor oil to settle.
- Unit repairs resulting from improper installation procedures are not covered by standard warranties.
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