Alarms And Safety Functions
This unit has alarm and safety functions, and also a self-diagnostic function.
Alarms and safety functions
Kind of Alarm
or Safety
Situation
Indication
Buzzer
Safety
Operation
High temperature
alarm
If the chamber temperature
exceeds the set temperature
more than 3 C.
Alarm lamp is lit.
Intermittent tone after
a delay of 15 minutes.
-----
Low temperature
alarm
If the chamber temperature
is lower 3 C than the set
temperature.
Alarm lamp is lit.
Intermittent tone after
a delay of 15 minutes.
-----
Power failure
alarm
In the event of a power
failure or disconnection of
power supply plug from the
outlet.
Display shuts off.
-----
-----
Door alarm
When door remains open for
more than 2 minutes.
Alarm lamp lights
after two minute
delay.
Intermittent tone after
a delay of 2 minutes.
-----
Auto return
If a key operation is not
performed for about 90
seconds in each setting
mode.
Chamber
temperature is
displayed.
-----
Setting mode is
canceled.
Key lock
When the key lock is ON.
Alternate LOC and
actual temperature.
-----
Key input is
disabled.
Thermal sensor
abnormality
If the thermal sensor goes
open (E10) or short circuit
(E1S).
Either E10 or E1S is
displayed.
-----
Defrost sensor
abnormality
If the defrost sensor goes
open (E20) or short circuit
(E2S).
Either E20 or E2S is
displayed.
-----
If defrost is taking
place, defrost will
stop. If not, unit
will not go into
defrost.
REFNAT5-SD, REFNAT5-GD 11
