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ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions shown in Table 7, and also self diagnostic functions.
Table 7 Alarms and safety functions
Alarm & Safety Situation Indication Buzzer Safety operation
High temperature
alarm
If the chamber temperature deviates from the
set temperature +2
o
C or up to +14
o
C.
Alarm lamp is flashed.
Chamber temperature is flashed.
Intermittent tone with
about 15 minutes delay.
Remote alarm with about
15 minutes delay.
If the chamber temperature deviates from the
set temperature -2
o
C or up to -14
o
C.
Intermittent tone with
about 15 minutes delay.
Remote alarm with about
15 minutes delay.
Low temperature
alarm
If the chamber temperature is lower than 0
o
C.
Alarm lamp is flashed.
Chamber temperature is flashed.
Intermittent tone Remote alarm
Over-heat
protection
When the chamber temp. is higher than 40
o
C.
(Reset when the chamber temp. is lower than
30
o
C)
----- -----
Inside fan, drain pan
heater, defrost heater,
drain pipe heater OFF
Over-cooling
protection
When the chamber temp. is lower than -1
o
C.
(Reset when the chamber temp. is higher than
6
o
C)
----- ----- Compressor OFF
Power failure
alarm
When the power to the unit is disconnected. ----- ----- Remote alarm.
Power failure alarm
(with MPR-48B)
At power failure.
If the power supply cord is unplugged.
Alarm lamp blinks. Intermittent tone Alarm status.
Door alarm When the door is open. Door check lamp is lit.
Intermittent tone with
about 2 minutes delay.
-----
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.
If the thermal sensor is disconnected.
Alarm lamp is flashed.
E01 and 50
o
C (or -50
o
C) are
displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the thermal sensor is short-circuited.
Alarm lamp is flashed.
E02 and 50
o
C (or -50
o
C) are
displayed alternately.
Intermittent tone
Remote alarm.
Unit keeps continuous
running.
If the defrost sensor is disconnected.
Alarm lamp is flashed.
E03 and chamber temp. are
displayed alternately.
Intermittent tone Remote alarm.
If the defrost sensor is short circuited.
Alarm lamp is flashed.
E04 and chamber temp. are
displayed alternately.
Intermittent tone Remote alarm.
If the compressor sensor is disconnected.
Alarm lamp is flashed.
E05 and chamber temp. are
displayed alternately.
Intermittent tone Remote alarm.
Sensor abnormality
If the compressor sensor is short-circuited.
Alarm lamp is flashed.
E06 and chamber temp. are
displayed alternately.
Intermittent tone Remote alarm.
Battery switch
check (with
MPR-48B)
When the battery switch is turned ON without
setting after attachment.
E09 and chamber temp. is
displayed alternately.
----- -----
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.
Battery check
(with MPR-48B)
When about 3 years have passed with the
power switch on. (time to replace the battery)
F-1 and chamber temp. is
displayed alternately.
----- -----
Fan motor check
When about 6 years have passed with the
power switch on. (time to replace the fan
motor)
F-2 and chamber temp. is
displayed alternately.
----- -----
Note:
The alarm status of remote alarm terminal is cancelled by pressing the alarm buzzer stop key (BUZZER)
since the remote alarm is operated in conjunction with alarm buzzer. (except for power failure alarm
status).
When more than two alarm conditions occur simultaneously, the lowest number error code has priority on
the error display.
After a power failure, the unit will resume operation with the set value that was in place before power
failure occurred.
The over-cooling protection may activate when the set temperature is 2
o
C. In this case, the chamber
temperature will rise to 6
o
C, but this is not malfunction