CAUTION
Make sure that the knobs O
a n
d O
af
e effective
in altering the values for the extremes of tempera-
tures without pressing the alarm setting key 0.
The settings of the excessively high and low temper-
atures can then be confirmed by pressing the alarm
setting key ©.
• Other
© Buzzer (BUZZER)
To stop the alarm from sounding, press this key.
Should a further abnormality occur, the buzzer
will sound automatically.
Key for Setting Programmed Operation
(PROGRAM)
Program setting key (SET)
This key sets the necessary components for pro-
grammed operation of the interior temperature
of the cabinet. When the key is depressed, the
desired values are displayed digitally in the order
required.
The order is as follows:
1) Temperature
2) Time
To input the values, follow steps 1 to 3. At each
step, press the | ENT| key O to enter each value.
Programmed operation start/stop key
(START/STOP)
Press the key once to initiate operation of the
program, and again to stop the program. The
start and stop operations are indicated by a lamp.
Program step lamp
When this lamp is lit, each step of the programmed
operation is conducted. When it flashes, the values
for each step are displayed digitally.
• Def rost (DE F ROST)
© Def rost key (DE F ROST)
Defrosting is initiated when this key is pressed.
This should be conducted when frost is visible
through the look-in window. Normal operation
is resumed automatically when the unit has de-
frosted. To stop defrosting in mid-cycle, press
the key once more.
Make sure that the cabinet interior temperature
is below 5°C when defrosting is commenced.
© Defrost display lamp
This lamp lights during defrosting.
• Fluorescent Lamp (LIGHT)
© Fluorescent lamp switch
When this switch is turned ON, the fluorescent
lamp in the inner cabinet will be lit, and will be
extinguished when the switch is turned OFF.
FUNCTION OF ITEMS IN
THE SWITCH BOX
© Power source switch (POWER)
Circuit breaker for all power sources, including
receptacles.
© Key lock switch (LOCK)
The keys on the control panel cannot be oper-
ated unless this switch is turned to the "OFF"
position. This key prevents the setting points
from being altered accidentally.
REMOTE ALARM
The terminal for the remote alarm is located in the
box at the rear top of the frame. (MIR-153, MIR-
253)
The terminal of the remote alarm is located in the
box at the rear bottom of the frame. (MIR-553)
The remote alarm terminal is a contact output. When
high or low temperature alarm operates, contact is
closed.
Contact capacity is 0.4A (AC -125V) or 2A (DC
30V).
MIR-153, 253
N o o
N o o
Y
Terminal for
the remote alarm
MIR-553
— Terminal for
the remote alarm
-9-