16
DISPLAY OF CHAMBER TEMPERATURE
The chamber temperature is set to 4
o
C at the factory. The temperature on the temperature display
shows the temperature of sensor for temperature display attached to the monitor bottle (upper and lower).
By pressing the temperature display changeover key, the displayed temperature is changed in sequence;
upper temperature, lower temperature, and mean temperature of upper and lower temperature. The
table 1 shows the procedure for changeover.
<Important>
The upper temperature is the representative of high temperature and the lower temperature is the
representative of low temperature. Accordingly, the displayed temperature is not always 4
o
C. This is
not a malfunction.
Table 1. Changeover of temperature display : Lamp ON : Lamp OFF
Operation
Key operated
Indication after operation
Display mode
1
Plug-in the power supply
cord and turn on the
power switch.
-----
Mean temperature is
displayed.
UPPER
LOWER
Mean
temperature
2
Press the temperature
display changeover key.
Upper temperature is
displayed.
UPPER
LOWER
Upper
temperature
3
Press the temperature
display changeover key.
Lower temperature is
displayed.
UPPER
LOWER
Lower
temperature
4
Press the temperature
display changeover key.
Mean temperature is
displayed.
UPPER
LOWER
Mean
temperature
5 Repeat from step 2.
DEFROSTING OF EVAPORATOR
The following 2 defrost methods are adopted in this unit and both of them are controlled automatically.
Cycle defrost
To keep the chamber temperature stable, the compressor is cycled on and off. During “off” period any
frost on the evaporator is melted by energizing a defrost heater. This will not have any discernible effect
on the chamber temperature.
Forced defrost
When the ambient humidity is high, or a large amount of damp product is being stored in the chamber,
there is a possibility that cycle defrost may not be enough to remove all of the frost on the evaporator. In
this case, a forced defrost is initiated when the defrost sensor detects the frost.
When the unit is operating under the forced defrost, the current chamber temperature and “dF” is
displayed alternately on the temperature display.
Once the forced defrost is completed, the normal operation resumes. Note the temperature of blood bag
(400 mL) in the chamber rises by approximately 1
o
C during the forced defrost.
UPPER
LOWER
UPPER
LOWER
UPPER
LOWER
Summary of Contents for MBR-305GR
Page 2: ......
