Sanyo MDF-U500VXC Failure Mode Comparison, Twin Guard Series vs. Conventional Cascade Freezer

Failure Mode Comparison

Twin Guard Series™ vs. Conventional Cascade Freezer

		Conventional Freezer,
Event	Conventional Freezer No Back-Up	with Back-Up System	SANYO Twin Guard Series™

Fan Failure	Freezer Fails
High Stage Compressor Failure	Freezer Fails
Low Stage Compressor Failure	Freezer Fails

Freezer fails, CO2 or LN2 back-up 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 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 LN2 or CO2 back-up system offers additional protection

	20
(°C)	0	Pull-up while a power failure
temp.	-20
Chamber	-40
		Single compressor operation
	-60	(kept at approx. -65°C)
	-80

Chamber temp. (°C)

40

20

0

-20

-40

-60

-80

Central air temp. in cabinet Ambient temp. 30°C, No-Load

-100

Normal cycle operation (-80°C setting)

0 1 2 3 4 5 6 7 8 9 10 11 12

(hour)

-100

0 1 2 3 4 5 6 7 8 9 10 11 12

(hour)

Performance Chart, power-failure situation Normal operation and Twin Guard Series™ backup.

Pull-up characteristics during power failure Pull-down charateristics

Reduced Power Consumption

The SANYO Twin Guard Series™ Freezer can be set for Normal or EcoMode™ operation, depending on ambient tem- perature and load. EcoMode™ is recom- 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.

Power Consumption Benefits

Model Number	MDF-U500VXC		MDF-U700VXC
Ambient Temperature	15°C	23°C	15°C	23°C
Normal Savings	-9.7%	-7.8%	-16.7%	-17.5%
EcoMode™ Savings	-16.8%	-14.1%	-18.5%	-18.3%

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