Alarms & Safety Functions - Sanyo MDF-U53V Service Manual

Ultra-low temperature freezer
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ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in Table 5, and also self diagnostic functions.
Table 5. Alarms and safety functions
Alarm & Safety
If the chamber temperature is higher
High temperature
than the temperature at which the
alarm
high temperature alarm is activated.
If the chamber temperature is lower
Low temperature
than the temperature at which the
alarm
low temperature alarm is activated.
When the power to the unit is
Power failure alarm
disconnected.
Door alarm
When the door is open.
Filter check
When the condenser filter is clogged.
When about 3 years has passed with
Battery check
power switch ON.
When about 5.5 years has passed with
Fan motor check
power switch ON.
When there is no key pressing in
Auto-return
each setting mode for 90 seconds.
Key lock
When the key lock is ON.
If the thermal sensor is disconnected.
If the thermal sensor is short-circuited.
If the cascade sensor is disconnected.
Sensor abnormality
If the cascade sensor is short
circuited.
If the filter sensor is disconnected.
If the filter sensor is short-circuited.
Battery switch
When the battery switch is OFF during
check
alarm test.
Condenser temp.
In the event of failure of fan motor for
abnormality
cooling the compressor
Note:
• When the operation is started in high ambient temperature, the filter check lamp is sometimes flashed.
In this case, the lamp is off automatically when the chamber temperature is getting lower.
• The freezer resumes the operation after power failure with the temperature setting before power failure
as the chamber temperature setting and alarm temperature setting are memorized in the volatile memory.
• The chamber temperature is displayed for 5 seconds by pressing buzzer stop key (BUZZER) during
power failure alarm. Then the buzzer is silenced. The alarm lamp keeps flashing.
21
Situation
ALARM lamp is flashed.
Temperature indicator is
flashed.
ALARM lamp is flashed.
Door check lamp lights.
Filter check lamp lights.
Battery check lamp lights.
Battery check lamp
flashed.
Chamber temperature is
displayed.
ALARM lamp is flashed.
E01 and chamber temp.
are displayed alternately.
ALARM lamp is flashed.
E02 and chamber temp.
are displayed alternately.
ALARM lamp is flashed.
E03 and chamber temp.
are displayed alternately.
ALARM lamp is flashed.
E04 and chamber temp.
are displayed alternately.
ALARM lamp is flashed.
E05 and chamber temp.
are displayed alternately.
ALARM lamp is flashed.
E06 and chamber temp.
are displayed alternately.
ALARM lamp is flashed.
E09 is flashed.
E10 and chamber temp.
are displayed alternately.
54
Indication
Buzzer
Intermittent tone with
15 minutes delay.
Intermittent tone
Intermittent tone with
2minutes delay.
Intermittent tone
-----
-----
-----
-----
-----
Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
-----
Intermittent tone
Safety operation
Remote alarm with 15
minutes delay.
Remote alarm.
-----
-----
-----
-----
Finishing of each
setting mode.
Change of setting is
disable.
Remote alarm.
Unit keeps continuous
running.
Remote alarm.
Unit keeps continuous
running.
Remote alarm.
Remote alarm.
Remote alarm.
Remote alarm.
-----
Remote alarm.
Compressor of high
stage side stops.

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