Sanyo MPR-721 - ALARMS & SAFETY FUNCTIONS

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°C or up to +14°C.
Alarm lamp is flashed.
Chamber temperature is flashed.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay.
Low temperature
alarm
If the chamber temperature deviates from the
set temperature -2°C or up to -14°C.
Alarm lamp is flashed.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay.
Chamber temperature is flashed.
Intermittent tone
Remote alarm
Over-heat
protection
When the chamber temp, is higher than 30°C.
(Reset when the chamber temp, is lower than
25°C)
—
Inside fan, drain pan
heater, defrost heater,
drain pipe heater OFF
Over-cooling
protection
— 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
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.
Sensor abnormality
If the thermal sensor is disconnected.
Alarm lamp is flashed.
E01 and 50°C (or -50°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“C (or -50°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.
If the compressor sensor is short-circuited.
Alarm lamp is flashed.
E06 and chamber temp, are
displayed alternately.
Intermittent tone
Remote alarm.
If the ambient temp, sensor is disconnected.
Alarm lamp is flashed.
E07 and chamber temp, are
displayed alternately.
Intermittent tone
Remote alarm.
If the ambient temp, sensor is short-circuited.
Alarm lamp is flashed.
E08 and chamber temp, are
displayed alternately.
Intermittent tone
Remote alarm.
Memory back-up
When power failure or disconnected the
power cord.
—
Set value memorized
Setting 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.
Note:
The remote alarm is silenced by pressing the alarm buzzer stop key (BUZZER) as the remote alarm is
operated in conjunction with the buzzer, except for the power failure alarm.
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°C. In this case, the chamber
temperature will rise to 6°C, but this is not malfunction.
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