Sanyo MBR-1404GR instruction manual Operating Instructions, Temperature display, Defrost cycles

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
	Operation	Key	Display			Display mode
		operated
1	Plug-in, Power ON		Average monitor bottle	●UPPER		Average temperature
			temperature	●LOWER
2	Press temp. display key	UPPER	Upper monitor bottle	●UPPER		Upper temperature
		LOWER	temperature	○LOWER
3	Press temp. display key	UPPER	Lower monitor bottle	○UPPER		Lower temperature
		LOWER	temperature	●LOWER
4	Press temp. display key	UPPER	Average monitor bottle	●UPPER		Average temperature
		LOWER	temperature	●LOWER

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.

17