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ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in Table 2, and also self diagnostic functions.
Table 2 Alarms and safety functions
Alarm & Safety Situation Indication Buzzer Safety operation
High temperature
alarm
If the upper or lower temperature sensor
senses a temperature 6
o
C.
Alarm lamp flashes. Intermittent tone Remote alarm
Low temperature
alarm
If the upper or lower temperature sensor
senses a temperature 2
o
C.
Alarm lamp flashes. Intermittent tone Remote alarm
Protection of
excessive high
temperature
If the high-temperature thermostat
sensor senses a temperature
approximately > 10
o
C.
----- -----
Compressor ON.
Heater OFF.
Protection of
excessive low
temperature
If the alarm sensor senses a
temperature approximately < 2
o
C.
----- -----
Compressor ON.
Heater OFF.
Power failure alarm
When the power to the unit is
disconnected or power switch is
turned off.
Alarm lamp flashes. Intermittent tone Remote alarm.
Door alarm When the door is ajar or open. Door check lamp is lit.
Intermittent tone
with 2 minutes
delay.
-----
Auto-return
When there is no key pressing in
each setting mode for 90 seconds.
Monitor bottle temperature is
displayed.
-----
Finishing of calibration
mode.
If the temperature sensor of upper
monitor bottle is disconnected or
short-circuited.
Alarm lamp flashes.
E1 and monitor bottle temp.
are displayed alternately.
Intermittent tone Remote alarm.
If the temperature sensor of lower
monitor bottle is disconnected or
short-circuited.
Alarm lamp flashes.
E2 and monitor bottle temp.
are displayed alternately.
Intermittent tone Remote alarm.
If the defrost sensor is disconnected or
short-circuited.
Alarm lamp flashes.
E3 and monitor bottle temp.
are displayed alternately.
Intermittent tone Remote alarm.
Thermal sensor
abnormality
If the over-temperature sensor is
disconnected or short-circuited.
Alarm lamp flashes.
E4 and monitor bottle temp.
are displayed alternately.
Intermittent tone Remote alarm.
Note:
The remote alarm is silenced by pressing the buzzer stop key (BUZZER) as the remote alarm is operated
in conjunction with the buzzer, except for the power failure alarm. All alarm functions will auto-reset.
The buzzer and remote contacts will re-activate if the condition which caused the alarm is not corrected
within 30 minutes.
Alarm conditions will remain active for about 24 hours on a fully charged back-up battery in the event of a
power failure. Two days operation is required to fully charge the battery after initial start-up if the power
has been off for an extended period.
The remote alarm contacts will remain active even if the battery is discharged.
Alarm test procedure
The alarm function can be checked by the following procedure:
1. Press alarm test (ALARM/TEST) key.
2. The audible and visual alarm indicators activate along with the remote alarm. The alarm condition
remains active for 30 seconds and then terminates automatically. The audible alarm (buzzer) cannot be
silenced by pressing the buzzer stop key (BUZZER).
3. Otherwise the alarm test can be terminated manually at any time during the rest by pressing the
ALARM/TEST key again.