Sanyo VR-L4110WSEC - Commercial Solutions Lab Manual page 27

Integrated LCD control with graphical display. The Twin Guard Series
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 Ultra-
Critical Biologicals
The SANYO Twin Guard Series
the industry demand for safe, long-
term storage for the most high-valued
materials. Two independent refrigeration
systems, combined with optional liquid
nitrogen or liquid CO back-up systems,
2
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 stor-
™
age of sensitive stem cells, embryos,
cell lines, and other rare specimens.
Independent systems efficient ultra-low cooling
is achieved through two independent evaporator
circuits surrounding the interior chamber.
MDF-U500VXC is managed by an integrated
™
Twin Guard Series
Refrigeration System
The Twin Guard Series
er avoids conventional cascade refrigera-
satisfies
™
tion technology by using two completely
independent one-compressor, autocas-
cade cooling systems, each capable of
maintaining ultra-low temperatures.
• Each refrigeration circuit includes a
closed-loop cold-wall evaporator con-
figured 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 mutu-
ally dependent high- and low-stage
systems.
Failure Mode Comparison
Event
Fan Failure
High Stage
Compressor
Failure
Low Stage
Compressor
Failure
-86 Dual°Cool
™
Ultra-Low Freez-
™
Conventional Freezer Conventional Freezer
No Backup With Backup
Freezer Fails
Freezer fails,
CO or LN
2
system offers
short-term
Freezer Fails
protection until
contents can
be removed and
repairs initiated.
Freezer Fails
• 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 CO or LN backup sys-
2 2
tem installed, the freezer will maintain
-65°C storage temperature for up to
eight hours (CO backup system) and
2
-65°C storage temperature for up to
15 hours (LN backup system).
2
• A unique EcoMode deploys both sys-
™
tems in overlapping cycles to maintain
-86°C and to reduce energy consump-
tion 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 inno-
vative refrigerant feedback processes
to reduce compressor temperature,
thereby extending compressor life and
minimizing heat output.
SANYO
Twin Guard
™
If one fan fails, the second fan auto-
matically maintains energy exchange.
backup
2
No high or low stage used. Two refrig-
eration systems, each with a single
compressor, operate independently in
overlapping cycles during normal opera-
tion. If one compressor fails internal
temperature is maintained indefinitely
at -65°C. Optional LN or CO
2
system offers additional protection.
™
™
Series
backup
2
27