Filter
Top Products
17
OPERATING INSTRUCTIONS
Temperature display
The unit is set at the factory to obtain the proper temperature automatically (4
o
C±1.5
o
C). The high
temperature alarm is preset at 6
o
C. The low temperature alarm is preset at 2
o
C.
Table 1. Temperature display : Lamp ON : Lamp OFF
Operation
Key
operated
Display Display mode
1 Plug-in, Power ON
Average monitor bottle
temperature
Average temperature
2 Press temp. display key
Upper monitor bottle
temperature
Upper temperature
3 Press temp. display key
Lower monitor bottle
temperature
Lower temperature
4 Press temp. display key
Average monitor bottle
temperature
Average temperature
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 4
o
C. 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 2
o
C during the defrosting.
UPPER
LOWER
UPPER
LOWER
UPPER
LOWER
UPPER
LOWER
UPPER
LOWER
UPPER
LOWER
UPPER
LOWER