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17
OPERATING INSTRUCTIONS
Temperature display
The unit is set at the factory to obtain the proper temperature automatically (4
o
C 1
o
C). There is no
need to set the temperature.
Table 1. Temperature display : Lamp ON : Lamp OFF
Operation Key operated Display Display mode
1
Plug-in the power
supply cord and turn on
the power switch.
-----
Average monitor bottle
temperature
UPPER
LOWER
Average temperature
2
Press the temperature
display key.
Upper monitor bottle
temperature
UPPER
LOWER
Upper temperature
3
Press the temperature
display key.
Lower monitor bottle
temperature
UPPER
LOWER
Lower temperature
4
Press the temperature
display key.
Average monitor bottle
temperature
UPPER
LOWER
Average temperature
5 Repeat from step 2.
Note:
The displayed temperature represents the temperature sensed by a thermal sensor attached to the
monitor bottle mounted to the upper and lower portion of the chamber.
The displayed temperature may not always be at 4
o
C. Because the chamber probes are representative
of high and low average temperatures within the chamber.
Defrost cycles
There is no need for routine defrosting of the unit as this occurs automatically as follows:
1. Cycle defrost
To keep the chamber temperature stable, the refrigeration compressor is cycled on and off. During “off”
period any frost which has accumulated on the evaporator is melted by energizing a defrost heater. This
will not have any discernible effect on the chamber temperature.
2. Forced defrost
When the ambient humidity is high, or a large amount of damp product is being stored inside 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 cycle can be initiated.
When the unit is operating under a forced defrost cycle, the current chamber temperature and “dF” is
displayed alternately on the digital temperature display.
Once the forced defrost cycle is completed, normal operation resumes.
The temperature of blood bag (400mL) in the chamber rises by approximately 1 to 2
o
C during the
defrosting.
UPPER
LOWER
UPPER
LOWER
UPPER
LOWER