21
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
Situation
Indication
Buzzer
Safety operation
High temperature
alarm
If the chamber temperature is higher
than the temperature at which the
high temperature alarm is activated.
Alarm lamp is flashed.
Digital temperature
indicator is flashed.
Intermittent tone with
about 15 minutes
delay.
Remote alarm with
about 15 minutes delay.
Low temperature
alarm
If the chamber temperature is lower
than the temperature at which the
low temperature alarm is activated.
Power failure alarm
When the power to the unit is
disconnected.
Alarm lamp is flashed.
Intermittent tone
Remote alarm.
Door alarm
When the door is open.
Door check lamp lights.
Intermittent tone with
about 2 minutes delay
-----
Filter alarm
When the condenser filter is clogged.
Filter check lamp lights.
Intermittent tone
-----
Battery check
When about 3 years has passed with
power switch ON.
Battery check lamp lights.
-----
-----
Fan motor check
When about 6 years has passed with
power switch ON.
Battery check lamp
flashed.
-----
-----
Auto-return
When there is no key pressing in
each setting mode for 90 seconds.
Chamber temperature is
displayed.
-----
Finishing of each
setting mode.
Key lock
When the key lock is ON.
-----
-----
Change of setting is
disable.
Sensor abnormality
If the thermal sensor is disconnected.
Alarm lamp is flashed.
E01 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the thermal sensor is short-circuited.
Alarm lamp is flashed.
E02 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the cascade sensor is disconnected.
Alarm lamp is flashed.
E03 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
If the cascade sensor is short
circuited.
Alarm lamp is flashed.
E04 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
If the filter sensor is disconnected.
Alarm lamp is flashed.
E05 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
If the filter sensor is short-circuited.
Alarm lamp is flashed.
E06 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
If the ambient temperature sensor is
disconnected.
Alarm lamp is flashed.
E07 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
If the ambient temperature sensor is
short-circuited.
Alarm lamp is flashed.
E08 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Battery switch
check
When the battery switch is OFF during
alarm test.
Alarm lamp is flashed.
E09 is flashed.
-----
-----
Condenser temp.
abnormality
In the event of failure of fan motor for
cooling the compressor
E10 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Compressor of high
stage side stops.
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 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. Contact our sales representative or agent at the time of
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.
