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Failure Mode Comparison
Twin Guard Series
vs. Conventional Cascade Freezer
™
Event
Fan Failure
High Stage Compressor Failure
Low Stage Compressor Failure
20
0
Pull-up while a power failure
-20
-40
-60
-80
Normal cycle operation (-80°C setting)
-100
0
1
2
3 4 5
Performance Chart, power-failure situation Normal operation and Twin Guard Series™ backup.
Reduced Power Consumption
The SANYO Twin Guard Series
can be set for Normal or EcoMode
operation, depending on ambient tem-
perature and load. EcoMode
™
mended for 90-95% of applications.
Although both refrigeration systems are
completely independent, EcoMode
establishes an overlapping cycle to
significantly reduce energy consump-
tion while optimizing interior uniformity
from top-to-bottom and front-to-back for
protection of high value materials.
Conventional Freezer No Back-Up
Freezer Fails
Freezer Fails
Freezer Fails
Single compressor operation
(kept at approx. -65°C)
6
7
8 9 10 11 12
(hour)
Freezer
™
Power Consumption Benefits
™
Model Number
is recom-
Ambient Temperature
™
Normal Savings
EcoMode
Savings
™
Conventional Freezer,
with Back-Up System
Freezer fails, CO
or LN
back-up
2
2
system offers short term protection
until contents can be removed and
repairs initiated
40
20
0
-20
-40
-60
-80
-100
0
1
2
Pull-up characteristics during power failure
Pull-down charateristics
MDF-U500VXC
15°C
23°C
-9.7%
-7.8%
-16.8%
-14.1%
SANYO Twin Guard Series
™
If one fan fails the second fan
automatically maintains energy
exchange
No high or low stage used. Two refrig-
eration systems, each with a separate
compressor, operate independently in
overlapping cycles during normal op-
eration. If one compressor fails internal
temperature is maintained indefinitely
at -65°C with backup compressor.
Optional LN
or CO
back-up system
2
2
offers additional protection
Central air temp. in cabinet
Ambient temp. 30°C, No-Load
3 4 5
6
7
8 9 10 11 12
(hour)
MDF-U700VXC
15°C
23°C
-16.7%
-17.5%
-18.5%
-18.3%
7
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