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OPERATING INSTRUCTIONS
Alarm and safety functions
This unit has the alarm and safety functions shown in table below, and also self diagnostic function.
Table 4. Alarm and safety function
Alarm & safety Situation Indication Buzzer Safety operation
High temperature
alarm
When the chamber temp. is
approx. 10
o
C (or 15
o
C) higher
than the set temp.
Alarm lamp blinks.
Intermittent
tone with
12
min. delay
Remote alarm
with 12 min. delay
Power failure
alarm
At power failure
When power cord is
disconnected.
Alarm lamp blinks.
Intermittent
tone
Remote alarm
Filter check
When the condenser filter
is clogged.
Filter check lamp lights. ----- -----
Auto-return
When there is no key
pressing in each setting
mode for 90 seconds.
Chamber temp. is
displayed.
-----
Finishing of each
setting mode
If the thermal sensor is
disconnected.
Alarm lamp blinks.
E01 and 50
o
C is
displayed alternately.
If the thermal sensor is
shirt-circuited.
Alarm lamp blinks.
E01 and -170
o
C is
displayed alternately.
Intermittent
tone
Remote alarm
Continuous
operation
If the cascade sensor is
disconnected.
Alarm lamp blinks.
E03 and chamber temp.
is displayed alternately.
If the cascade sensor is
shirt-circuited.
Alarm lamp blinks.
E04 and chamber temp.
is displayed alternately.
Intermittent
tone
Remote alarm
If the filter sensor is
disconnected.
Alarm lamp blinks.
E05 and chamber temp.
is displayed alternately.
Sensor
abnormality
If the filter sensor is
short-circuited.
Alarm lamp blinks.
E06 and chamber temp.
is displayed alternately.
Intermittent
tone
Remote alarm
Note
The filter check lamp sometimes lights at the start-up under high ambient temperature. The lamp will is
off when the chamber temperature is getting lower.
Operation after power failure
The set value (setting of chamber temperature and alarm temperature) is memorized by nonvolatile
memory. Accordingly, the freezer resumes the operation with setting before power failure.