Sanyo VR-L4110WSEC Booklet - Page 27

Integrated LCD control with graphical display. The Twin Guard Series™ MDF-U500VXC is managed by an integrated microprocessor controller with LCD information center to simplify all freezer functions. Uniform ultra-low temperature is achieved through a combination of performance systems supervised by the controller complete with alarm, programming and diagnostic protocols. The Safest Ultra-Low Freezer for Long-Term Storage of UltraCritical Biologicals The SANYO Twin Guard Series™ satisfies the industry demand for safe, longterm storage for the most high-valued materials. Two independent refrigeration systems, combined with optional liquid nitrogen or liquid CO2 back-up systems, offer a circle of protection unmatched in the marketplace. Developed for use with conventional inventory racks and boxes, the Twin Guard Series™ is ideal for storage of sensitive stem cells, embryos, cell lines, and other rare specimens. Twin Guard Series™ -86 Dual°Cool Refrigeration System The Twin Guard Series™ Ultra-Low Freezer avoids conventional cascade refrigeration technology by using two completely independent one-compressor, autocascade cooling systems, each capable of maintaining ultra-low temperatures. • Each refrigeration circuit includes a closed-loop cold-wall evaporator configured in parallel to the other. • Independent evaporators and cooling fans assure back up status at all times, eliminating system failure due to sub-component failure in conventional cascade systems configured of mutually dependent high- and low-stage systems. • In the unlikely event of a compressor failure in one system, the remaining system will automatically maintain a minimum of -65°C for an indefinite period. • In the event of a facility power failure with optional CO2 or LN2 backup system installed, the freezer will maintain -65°C storage temperature for up to eight hours (CO2 backup system) and -65°C storage temperature for up to 15 hours (LN2 backup system). • A unique EcoMode™ deploys both systems in overlapping cycles to maintain -86°C and to reduce energy consumption by as much as 15%. • Evaporator coils embedded in the patented, high-tech, SANYO V.I.P.™ vacuum-insulated thin-wall cabinet are strategically oriented to deliver the best temperature uniformity at all shelf levels, top-to-bottom and front-to-back. • New SANYO-designed Cool Safe™ refrigeration compressors feature innovative refrigerant feedback processes to reduce compressor temperature, thereby extending compressor life and minimizing heat output. Independent systems efficient ultra-low cooling is achieved through two independent evaporator circuits surrounding the interior chamber. Failure Mode Comparison Event Conventional Freezer Conventional Freezer No Backup With Backup SANYO Twin Guard™ Series Fan Failure High Stage Compressor Failure Low Stage Compressor Failure Freezer Fails Freezer Fails Freezer Fails Freezer fails, CO2 or LN2 backup system offers short-term protection until contents can be removed and repairs initiated. If one fan fails, the second fan automatically maintains energy exchange. No high or low stage used. Two refrigeration systems, each with a single compressor, operate independently in overlapping cycles during normal operation. If one compressor fails internal temperature is maintained indefinitely at -65°C. Optional LN2 or CO2 backup system offers additional protection. 27