Defrost In Refrigerator - Yamato IN604W Instruction Manual

Defrost in Refrigerator

Much frost on the evaporator degrades the refrigeration capability, which may cause
uncontrollability of setting temperature. In the IN604W, the condition of frost on the evaporator
can be checked through the frost inspection window inside furnace. The frosting speed varies
depending on the following conditions.
1) Temperature used･･････････････Easily frosted when using the unit in low temperature
2) External temperature/humidity･･･Easily frosted when external temperature/humidity is higher
3) Sample in furnace･･････････････Easily frosted when sample contains much water
The following operations can be set to take measure against frosting in the IN604W. Set either of
them depending on the situation. The fixed temperature and program operation are available
there by pressing the DEFROST key on the operation panel, in addition to the program operation.
① Manual defrost operation (manual start/automatic stop):
Perform the defrost operation if much frost is in the evaporator. Temperature control is suspended in
addition to stop of heater and blast fan during operation. The operation is started manually and
stopped automatically with the built-in timer after 5-minute operation.
→Refer to the page 44 for the operating instructions.
② Cycle defrost operation (Automatic start/stop):
Set the cycle defrost operation to operate the unit effectively for long term. The unit can repeat the
defrost operation and operation stop automatically at specified interval specified previously. Frost
can be usually removed to perform the cycle defrost operation for ten minutes in a day. The amount
of frost varies depending on the conditions. Set it appropriately. Temperature control is suspended in
addition to stop of heater and blast fan during operation.
→Refer to the page 45 for the operating instructions.
CAUTION!
 The temperature in furnace increases about 3℃ at the defrost operation. Be careful if it affects the
samples. The indicated temperature may increase more than 10℃ at that time.
③ Setting of refrigeration operation mode in refrigerator (continuous/cycle):
Generation of frost can be reduced by setting the cycle operation where the refrigerator repeats
operation and halt.
continuous operation, cycle operation or halt condition. The refrigerator repeats 12-minute operation
and 12-minute halt condition in the cycle operation. If the setting temperature is 10℃ or below, it
switches automatically to the continuous operation related to the refrigeration capacity.
refrigerator does not work regardless of setting temperature if it is set to be stopped. Set the
continuous operation when considering the accuracy of temperature control important, and set the
cycle operation when reducing the mount of frost at long term operation (the accuracy of temperature
control lower than that in the continuous operation). The cycle operation can also prevent the
samples from drying. Set the refrigerator stop if it is not necessary to be operated (it automatically
stops if the setting temperature is 44℃ or above).
→Refer to the page 47 for the operating instructions.
CAUTION!
 The frosting amount varies depending on the conditions in use even the cycle operation is set. It may
be larger when operating the refrigerator for long term. In this case, defrost the refrigerator by
performing the defrost operation or cycle defrost operation.
The refrigerator operation mode has a function to set the refrigerator to
Before Using this unit
8
The