OPERATING INSTRUCTIONS
Temperature display
The unit is set at the factory to obtain the proper temperature automatically (4oC±1.5oC). The high temperature alarm is preset at 6oC. The low temperature alarm is preset at 2oC.
Table 1. Temperature display |
| ●: Lamp ON | ○: Lamp OFF | ||||
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| Operation | Key | Display |
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| Display mode |
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| operated |
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1 |
| Average monitor bottle | ●UPPER | Average temperature | |||
| temperature | ●LOWER | |||||
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2 | Press temp. display key | UPPER | Upper monitor bottle | ●UPPER | Upper temperature | ||
LOWER | temperature | ○LOWER | |||||
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3 | Press temp. display key | UPPER | Lower monitor bottle | ○UPPER | Lower temperature | ||
LOWER | temperature | ●LOWER | |||||
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4 | Press temp. display key | UPPER | Average monitor bottle | ●UPPER | Average temperature | ||
LOWER | temperature | ●LOWER | |||||
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5 Repeat from 2
Note: The displayed temperature represents the temperature sensed by a thermal sensor attached to the monitor bottles mounted to the upper and lower portion of the chamber. The displayed temperature may not always be at 4oC. The chamber probes are representative and 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 temperature stable inside the chamber, the refrigeration compressor is cycled on and off. During “off “ periods 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 complete, normal operation resumes. The chamber temperature of blood bag (400 ml) rises about 1 to 2oC during the defrosting.
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