Sanyo MDF-U333, MDF-U537 instruction manual Alarms & Safety Functions, Alarms and safety functions

ALARMS & SAFETY FUNCTIONS

This unit has the alarms and safety functions shown in Table 5, and also self diagnostic functions.

Table 5 Alarms and safety functions

Alarm & Safety	Situation	Indication	Buzzer	Safety operation
High temperature	If the chamber temperature is higher	ALARM lamp is flashed.	Intermittent tone with	Remote alarm with 15
	than the temperature at which the	Temperature indicator is
alarm			15 minutes delay.	minutes delay.
	high temperature alarm is activated.	flashed.
Low temperature	If the chamber temperature is lower	ALARM lamp is flashed.	Intermittent tone with	Remote alarm with 15
	than the temperature at which the	Temperature indicator is
alarm			15 minutes delay.	minutes delay.
	low temperature alarm is activated.	flashed.
	In the case of power failure.
Power failure alarm	When power switch is turned OFF.	ALARM lamp is flashed.	Intermittent tone	Remote alarm.
	When the power to the unit is
	disconnected.
Auto-return	When there is no key pressing in	Chamber temperature is	-----	Finishing of each
	each setting mode for 90 seconds.	displayed.		setting mode.
Key lock	When the key lock is “ON”.	-----	-----	Change of setting is
				disable.
Thermal sensor	If the thermal sensor is	ALARM lamp is flashed.		Remote alarm.
		E01 and chamber temp. are	Intermittent tone
Abnormality	disconnected.			Continuous running.
		displayed alternately.
(for MDF-U537D,
		ALARM lamp is flashed.
upper chamber	If the thermal sensor is			Remote alarm.
		E02 and chamber temp. are	Intermittent tone
only)	short-circuited.			Continuous running.
		displayed alternately.
Thermal sensor	If the thermal sensor is	ALARM lamp is flashed.		Remote alarm.
		E03 and chamber temp. are	Intermittent tone
abnormality	disconnected.			Continuous running.
		displayed alternately.
(MDF-U537D,
		ALARM lamp is flashed.
lower chamber	If the thermal sensor is			Remote alarm.
		E04 and chamber temp. are	Intermittent tone
only)	short-circuited.			Continuous running.
		displayed alternately.
	If the protective sensor for	ALARM lamp is flashed.
Thermal sensor		E05 and chamber temp. are
	compressor is disconnected.			Remote alarm.
abnormality		displayed alternately.	Intermittent tone
(MDF-U537, U537D	If the protective sensor for	ALARM lamp is flashed.		Normal operation.
only)	compressor is short-circuited.	E06 and chamber temp. are
		displayed alternately.
	If the thermal sensor for lower	ALARM lamp is flashed.
		E07 and chamber temp. are
Thermal sensor	chamber is disconnected.			Remote alarm.
		displayed alternately.	Intermittent tone
abnormality
		ALARM lamp is flashed.		Normal operation.
(MDF-U537 only)	If the thermal sensor for lower
		E08 and chamber temp. are
	chamber is short-circuited.
		displayed alternately.
Battery switch	When battery switch is OFF at the	ALARM lamp is flashed.	Intermittent tone	Remote alarm.
check	time of alarm test.	E09 is flashed.
	In the case of failure of compressor			Remote alarm.
				Compressor stops
	cooling fan motor.
				running when the temp
Compressor temp.	In the case of abnormal high
		E10 and chamber temp. are	Intermittent tone	reaches about 100oC.
Abnormality (MDF-	temperature due to the dust on the	displayed alternately.		Electromagnetic valve
U537, U537D only)	condenser.
				1, 2 and compressor
	In the case of abnormal high
				stop.
	ambient temperature.
				(MDF-U537D only)

Note:

1.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.

2.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.

3.The chamber temperature is displayed for 5 seconds if the BUZZER key is depressed during the power failure alarm. At the same time, the alarm stops.

4.The remote alarm is silenced by pressing BUZZER key as the remote alarm is operated in conjunction with the buzzer, except for the power failure alarm.

5.After 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.

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