Alarms & Safety Functions - Panasonic MDF-U76VA Operating Instructions Manual

ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in Table 9, and also self diagnostic functions.
Table 9. 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 alarm When the condenser filter is clogged.
When about 3 years has passed with
Battery check
power switch ON.
When about 6 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.
If the cascade sensor is short
circuited.
Sensor abnormality
If the filter sensor is disconnected.
If the filter sensor is short-circuited.
If the ambient temperature sensor is
disconnected.
If the ambient temperature 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 lit. 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 nonvolatile
memory.
• The battery for power failure alarm is an article for consumption. It is recommended that the battery will
be replaced about every three years.
replacement of the battery.
• Fan motors are expendable supplies. Replace them for about every six years. Contact our sales
representative or agent at the time of replacement of the fan motors.
• The chamber temperature is displayed for five seconds by pressing buzzer stop key (BUZZER) during
power failure alarm. Then the buzzer is silenced. The alarm lamp keeps flashing.
Situation
Alarm lamp is flashed.
Digital 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.
E07 and chamber temp.
are displayed alternately.
Alarm lamp is flashed.
E08 and chamber temp.
are displayed alternately.
Alarm lamp is flashed.
E09 is flashed.
E10 and chamber temp.
are displayed alternately.
Contact our sales representative or agent at the time of
21
Indication Buzzer
Intermittent tone with
about 15 minutes
delay.
Intermittent tone
Intermittent tone with
about 2 minutes delay
Intermittent tone
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Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
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Intermittent tone
Safety operation
Remote alarm with
about 15 minutes delay.
Remote alarm.
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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.
Remote alarm.
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Remote alarm.
Compressor of high
stage side stops.