This document describes the Silver King Refrigerated Glass Door Merchandiser, Model SKRM48-EGUS1, a food service equipment designed for reliable operation and display of merchandise. It includes a technical manual, replacement parts list, and warranty information.
Function Description:
The Silver King Refrigerated Glass Door Merchandiser is an automatic defrost unit designed to store and display food products at controlled temperatures. It features an electronic temperature control for precise temperature management and an automatic defrost system that eliminates frost buildup on the evaporator coil during compressor "off" cycles. Defrost water is collected in a pan within the compressor compartment and evaporated into the room air, eliminating the need for additional plumbing. The unit is equipped with glass doors, allowing customers to view the merchandise without opening the doors, which helps maintain internal temperature and reduce energy consumption. The interior is illuminated by LED lights, enhancing product visibility.
Usage Features:
The unit is designed for ease of use and flexibility in displaying products.
- Installation: Before initial use, the plastic protective covering on the stainless steel exterior should be removed, and both interior and exterior surfaces cleaned with a mild soapy water solution. The unit comes with legs that need to be installed tightly.
- Shelving System: The merchandiser includes two shelves and eight shelf supports. The shelves are adjustable, allowing for customization of display configurations. To install or adjust shelves, the doors must first be removed by lifting them off the bottom door track and swinging them out. Shelves can be installed level or at a slant to better display merchandise by adjusting the height of the rear shelf supports.
- Door Operation: The glass doors are removable for easy installation of shelves and for cleaning. They are designed with roller wheels that should be regularly checked and lubricated to ensure free spinning.
- Placement: Proper placement is crucial for optimal operation. The unit should not be placed near heat sources like ovens or heating elements. When placed on a counter, the structure must be able to support a minimum of 500 pounds. Adequate ventilation is required, with a minimum clearance of 6 inches on the compressor end or open space in front and back if the end is blocked. The unit should be level or tilted slightly backward to ensure proper drainage of condensate water. It can also be wall-mounted using an optional Wall Mounting Kit (part number 10314-50).
- Initial Start-Up: After installation, the unit is ready to operate once the power cord is connected to a properly grounded 115 Volt, 60 Cycle, 1 Phase electrical receptacle. The power cord has a 3-prong plug for grounding purposes, and any attempt to alter it will void the warranty and can result in serious injury. The circuit must be protected by a 15 or 20 ampere fuse or breaker, and the unit should not be plugged into an extension cord. If the compressor does not start, check that the temperature control is not in the "off" position. Allow the unit to run for two hours before loading it with product, taking care not to block airflow at the end of the cabinet.
- Temperature Control: The electronic temperature control is located on the right end of the unit. To check the set point, press and release the 'set' button. To adjust it, press and hold the 'set' button for two seconds, then use the up or down arrows. The new set point is stored by pressing 'set' again or waiting 10 seconds. Allow at least one hour for the unit to respond to temperature adjustments.
- Lighting: An on/off switch for the LED lights is located on the right front end of the light shroud.
- Safety Precautions: The manual emphasizes numerous safety precautions, especially concerning the use of R290 flammable refrigerant. Users are warned against puncturing refrigeration tubing, using mechanical devices for defrosting, or storing explosive substances. Servicing should only be performed by trained personnel using Silver King approved replacement parts. The unit should not be plugged into a GFI protected circuit. It is also advised to let the unit stand with its legs on the ground for at least 24 hours if it has been transported on its side.
Maintenance Features:
Preventative maintenance is minimal but essential for continued operation and maximizing the appliance's lifespan.
- Cabinet Surfaces: The exterior is stainless steel, and the interior is aluminum. These surfaces should be cleaned periodically with a warm water and mild soap solution, rinsed, and wiped dry with a soft cloth. Abrasive cleansers or scouring pads should be avoided. For stained surfaces, a soft cleanser should be used, rubbing with the grain of the metal to prevent scratching. Caustic cleaners should not be used on stainless steel.
- Condenser: Dust and debris will accumulate on the condenser coil and must be cleaned regularly to maintain compressor warranty. The condenser is located behind the end cover on the right side of the unit. To access it, remove the six screws securing the cover. The accumulated dust/debris can be cleaned with a vacuum, brush, or chemical cleaning agent (e.g., Nu-Calgon 4171-75). Caution is advised as the condenser fins are very sharp.
- Doors: The roller wheels on the doors should be regularly inspected to ensure they spin freely. If they become sticky, they should be lubricated with a penetrating lubricant, avoiding sticky lubricants that can build up.
- Refrigerant System Servicing (R290): Specialized precautions are outlined for servicing units using R290 refrigerant due to its flammability.
- Qualified Personnel: Only competent persons should perform maintenance, service, and repair operations that affect safety, such as breaking into the refrigerating circuit or opening sealed components.
- Safety Checks: Before working on systems with flammable refrigerants, safety checks are necessary to minimize ignition risk. Work must be performed under controlled procedures to minimize the presence of flammable gas or vapor.
- Work Area: All maintenance staff must be instructed on the nature of the work. Confined spaces should be avoided. The area must be checked with an appropriate refrigerant detector before and during work to detect potentially toxic or flammable atmospheres. The detector must be suitable for all applicable refrigerants and intrinsically safe.
- Fire Extinguisher: Appropriate fire extinguishing equipment (dry chemical or CO2) must be available if hot work is conducted.
- No Ignition Sources: No ignition sources, including cigarette smoking, should be present during work that involves exposing pipework or where refrigerant could be released. "No Smoking" signs must be displayed.
- Ventilation: The work area must be adequately ventilated, preferably expelling released refrigerant externally. Ventilation should continue throughout the work.
- Refrigeration Equipment Checks: Electrical components being changed must be fit for purpose and correct specification. Manufacturer's guidelines must be followed. Checks include ensuring the refrigerant charge is appropriate for the room size, ventilation machinery operates adequately, and refrigerant-containing parts are not corroded.
- Electrical Device Checks: Repairs and maintenance to electrical components include initial safety checks and component inspection. No electrical supply should be connected if a fault compromises safety. Capacitors must be discharged safely, and live electrical components and wiring must not be exposed during charging, recovering, or purging. Earth bonding continuity must be ensured.
- Sealed Components: All electrical supplies must be disconnected before removing sealed covers. If an electrical supply is necessary, a continuously operating leak detection system must be in place. Attention must be paid to ensure the casing's protection level is not affected by damage to cables, connections, terminals, seals, or glands. Apparatus must be mounted securely, and seals must not be degraded.
- Intrinsically Safe Components: No permanent inductive or capacitance loads should be applied to the circuit without ensuring they do not exceed permissible voltage and current. Only intrinsically safe components can be worked on while live in a flammable atmosphere. Replacement parts must be manufacturer-specified. Silicon sealant can inhibit leak detection.
- Cabling: Cabling must be checked for wear, corrosion, excessive pressure, vibration, sharp edges, or other adverse physical/environmental effects, considering aging and continual vibration.
- Detection of Flammable Refrigerants: No potential ignition sources should be used for leak detection. Halide torches or naked flame detectors are prohibited. Electronic leak detectors are acceptable but must be calibrated in a refrigerant-free area and suitable for the refrigerant used, set at a maximum of 25% of the refrigerant's LFL. Leak detection fluids are also suitable, but detergents containing chlorine should be avoided. If a leak is suspected, all naked flames must be removed. If brazing is required, all refrigerant must be recovered or isolated.
- Removal and Evacuation: Refrigerant removal must follow local and national regulations. The circuit must be purged with oxygen-free nitrogen, evacuated (optional for A2L), and then opened by cutting or brazing. Compressed air or oxygen must not be used for purging. The process of breaking vacuum with oxygen-free nitrogen and venting to atmosphere should be repeated until no refrigerant remains. The vacuum pump outlet must not be near ignition sources and must be ventilated.
- Charging Procedures: Contamination of different refrigerants must be avoided. Hoses or lines should be as short as possible. Cylinders must be kept in the appropriate position. The refrigerating system must be earthed before charging. The system must be labeled upon completion of charging. Overfilling the system must be avoided. Prior to recharging, the system must be pressure-tested with purging gas and leak-tested upon completion of charging and before commissioning. A follow-up leak test is required before leaving the site.
This comprehensive manual ensures safe and efficient operation and maintenance of the Silver King Refrigerated Glass Door Merchandiser.
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