OPERATING INSTRUCTIONS
Temperature display
The unit is set at the factory to obtain the proper temperature automatically (4oC±1oC). There is no need to set the temperature.
Table 1. Temperature display | ●: Lamp ON ○: Lamp OFF |
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| Operation | Key operated | Display |
| Display mode | |||
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| Average monitor bottle | ● UPPER |
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1 | supply cord and turn on |
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| Average temperature | ||||
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| temperature | ● LOWER | |||||
| the power switch. |
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| Press the temperature |
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| Upper monitor bottle | ● UPPER |
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2 |
| UPPER | Upper temperature | |||||
display key. |
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| temperature | ○ LOWER | ||
| LOWER |
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| Press the temperature |
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| Lower monitor bottle | ○ UPPER |
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3 |
| UPPER | Lower temperature | |||||
display key. |
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| temperature | ● LOWER | ||
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| LOWER |
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| Press the temperature |
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| Average monitor bottle | ● UPPER |
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4 |
| UPPER | Average temperature | |||||
display key. |
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| temperature | ● LOWER | ||
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| LOWER |
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5 | Repeat from step 2. |
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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 4oC. 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 2oC during the defrosting.
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