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ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions and also self diagnostic functions shown in Table 7.
Table 7. Alarms, safety functions and self diagnostic functions
Alarm
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.
In the case of power failure.
When power switch is turned OFF.
Power failure alarm
When the power to the unit is
disconnected.
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.
Thermal sensor
abnormality
If the thermal sensor is short-circuited.
If the protective sensor for compressor
Protective sensor
is disconnected.
for compressor
abnormality
If the protective sensor for compressor
(MDF-437 only)
is short-circuited.
Battery switch
When the battery switch is OFF at the
check
time of alarm test.
In the case of failure of compressor
cooling fan motor.
Compressor temp.
In the case of abnormal high
abnormality
temperature due to the dust on the
(MDF-437 only)
condenser.
In the case of abnormal high ambient
temperature.
When about 3 years have passed
with the power cord connected to
Battery check
the outlet.
(time to replace the battery)
When about 6 years have passed
Fan motor check
with the power cord connected to
(MDF-437 only)
the outlet.
(time to replace the fan motor)
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 completely. 2-day
operation of the freezer is needed to charge the battery full.
The chamber temperature is displayed for 5 seconds if the alarm buzzer stop key (BUZZER) is
depressed during the power failure alarm. After that, the alarm buzzer stops.
The remote alarm is not silenced by pressing alarm buzzer stop key (BUZZER).
At the recovery from power failure, the operation is resumed with the condition before power failure
since the temperature setting and alarm temperature setting 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 an expendable supplies (MDF-437 only). Replace the fan motor about every 6 years.
Contact our sales representative or agent at the time of replacement of the fan motor.
Situation
Alarm lamp is flashed.
Digital temperature
indicator is flashed.
Alarm lamp is flashed.
Digital temperature
indicator is flashed.
Alarm lamp is 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.
E05 and chamber temp.
are displayed alternately.
Alarm lamp is flashed.
E06 and chamber temp.
are displayed alternately.
E09 is displayed.
Alarm lamp is flashed.
E10 and chamber temp.
are displayed alternately.
F-1 and chamber temp. is
displayed alternately.
F-2 and chamber temp. is
displayed alternately.
18
Indication
Buzzer
Intermittent tone with
15 minutes delay.
Intermittent tone with
15 minutes delay.
Intermittent tone
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Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
Intermittent tone
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Safety operation
Remote alarm with 15
minutes delay.
Remote alarm with 15
minutes delay.
Remote alarm.
Finishing of each
set mode.
Change of setting is
disable.
Remote alarm.
Normal operation.
Remote alarm.
Normal operation.
Remote alarm.
Normal operation.
Remote alarm.
Normal operation.
Remote alarm.
Remote alarm.
Compressor stops.
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