18
ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in Table 6, and also self diagnostic functions.
Table 6 Alarms and safety functions
Alarm
Situation
Indication
Alarm buzzer
Safety functions
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
15 minutes delay.
Remote alarm with 15
minutes delay.
Low temperature
alarm
If the chamber temperature is lower
than the temperature at which the
low temperature alarm is activated.
Alarm lamp is flashed.
Digital temperature
indicator is flashed.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay.
Power failure
alarm
In the case of power failure.
When power switch is turned OFF.
When the power to the unit is
disconnected.
Alarm lamp is flashed.
Intermittent tone
Remote alarm.
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.
Thermal sensor
abnormality
If the thermal sensor is disconnected.
Alarm lamp is flashed.
E01 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Continuous running.
If the thermal sensor is short-circuited.
Alarm lamp is flashed.
E02 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Continuous running.
Sensor
abnormality
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.
Battery switch
check
When battery switch is OFF at the time
of alarm test.
Alarm lamp is flashed.
E09 is flashed.
Intermittent tone
Remote alarm.
Condenser temp.
abnormality
In the event of failure of fan motor for
cooling the compressor.
When the ambient temperature exceeds
the usable environmental condition, etc.
E10 and chamber temp. are
displayed alternately.
Intermittent tone
Remote alarm.
Temperature
control sensor
abnormality
If the sensor is disconnected.
Alarm lamp is flashed.
E11 and chamber temp.
are displayed alternately.
Intermittent tone
Remote alarm.
Normal operation.
If the sensor is short-circuited.
Alarm lamp is flashed.
E12 and chamber temp.
are displayed alternately.
Battery check
When about 3 years has passed with
power switch ON.
(time to replace the battery)
_F1 and chamber temp.
are displayed alternately.
----- -----
Fan motor check
When about 6 years has passed with
power switch ON.
(time to replace the fan motor)
_F2 and chamber temp.
are displayed alternately.
----- -----
Note:
•
The above power failure alarm is available when the battery switch is on and the battery is charged. If
the battery switch is off or the battery is discharged, only the remote alarm is activated.
• The power failure alarm can be kept about 12 hours with the battery charged fully. 2-day operation of
the freezer is needed to charge the battery full.
• The chamber temperature is displayed for 5 seconds if the buzzer stop key (BUZZER) key is depressed
during the power failure alarm. Then the buzzer is stopped. The alarm lamp keeps flashing.
• The remote alarm is cancelled by pressing buzzer stop key (BUZZER) as the remote alarm is operated in
conjunction with the buzzer, except for the power failure alarm.
• After power failure, the operation is resumed with the condition before power failure since the
temperature setting and alarm temperature setting and alarm resume time are memorized in a nonvolatile
memory.
• The battery for power failure alarm is an article for consumption. It is recommended that the battery will
be replaced about every 3 years. Contact our sales representative or agent at the time of replacement of
the battery.
• Fan motor is expendable supplies. Replace it for about every 6 years. Contact our sales
representative or agent at the time of replacement of the fan motors.
