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

If the chamber temperature deviates from the

Alarm lamp is flashed.

Intermittent tone with

Remote alarm with about

alarm

 

set temperature +2oC or up to +14oC.

Chamber temperature is flashed.

about 15 minutes delay.

15 minutes delay.

Low temperature

If the chamber temperature deviates from the

Alarm lamp is flashed.

Intermittent tone with

Remote alarm with about

set temperature -2oC or up to -14oC.

about 15 minutes delay.

15 minutes delay.

alarm

 

If the chamber temperature is lower than 0oC.

Chamber temperature is flashed.

Intermittent tone

Remote alarm

Over-heat

 

When the chamber temp. is higher than 40oC.

 

 

Inside fan, drain pan

 

(Reset when the chamber temp. is lower than

-----

-----

heater, defrost heater,

protection

 

 

30oC)

 

 

drain pipe heater OFF

 

 

 

 

Over-cooling

 

When the chamber temp. is lower than -1oC.

 

 

 

 

(Reset when the chamber temp. is higher than

-----

-----

Compressor OFF

protection

 

 

6oC)

 

 

 

 

 

 

 

 

Power failure

 

When the power to the unit is disconnected.

-----

-----

Remote alarm.

alarm

 

 

 

 

 

 

Power failure alarm

At power failure.

Alarm lamp blinks.

Intermittent tone

Alarm status.

(with MPR-48B)

If the power supply cord is unplugged.

 

 

 

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

Chamber temperature is

-----

Finishing of each setting

 

mode for 90 seconds.

displayed.

mode.

 

 

 

Key lock

 

When the key lock is “ON”.

-----

-----

Change of setting is

 

disable.

 

 

 

 

 

 

 

 

Alarm lamp is flashed.

 

Remote alarm.

 

 

If the thermal sensor is disconnected.

E01 and 50oC (or -50oC) are

Intermittent tone

Unit keeps continuous

 

 

 

displayed alternately.

 

running.

 

 

 

Alarm lamp is flashed.

 

Remote alarm.

 

 

If the thermal sensor is short-circuited.

E02 and 50oC (or -50oC) are

Intermittent tone

Unit keeps continuous

 

 

 

displayed alternately.

 

running.

 

 

 

Alarm lamp is flashed.

 

 

 

 

If the defrost sensor is disconnected.

E03 and chamber temp. are

Intermittent tone

Remote alarm.

Sensor abnormality

 

displayed alternately.

 

 

 

Alarm lamp is flashed.

 

 

 

 

 

 

 

 

 

If the defrost sensor is short circuited.

E04 and chamber temp. are

Intermittent tone

Remote alarm.

 

 

 

displayed alternately.

 

 

 

 

 

Alarm lamp is flashed.

 

 

 

 

If the compressor sensor is disconnected.

E05 and chamber temp. are

Intermittent tone

Remote alarm.

 

 

 

displayed alternately.

 

 

 

 

 

Alarm lamp is flashed.

 

 

 

 

If the compressor sensor is short-circuited.

E06 and chamber temp. are

Intermittent tone

Remote alarm.

 

 

 

displayed alternately.

 

 

Battery

switch

When the battery switch is turned ON without

E09 and chamber temp. is

-----

-----

check

(with

setting after attachment.

displayed alternately.

MPR-48B)

 

 

 

 

 

Condenser temp.

In the event of failure of fan motor for cooling

E10 and chamber temp. are

 

Remote alarm.

Intermittent tone

Compressor of high stage

abnormality

 

the compressor

displayed alternately.

 

 

side stops.

 

 

 

 

 

Battery check

 

When about 3 years have passed with the

F-1 and chamber temp. is

-----

-----

(with MPR-48B)

power switch on. (time to replace the battery)

displayed alternately.

 

 

Fan motor check

When about 6 years have passed with the

F-2 and chamber temp. is

-----

-----

power switch on. (time to replace the fan

displayed alternately.

 

 

motor)

 

 

 

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 2oC. In this case, the chamber temperature will rise to 6oC, but this is not malfunction

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Sanyo MPR-1411R instruction manual Alarms & Safety Functions, Alarms and safety functions

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