Operating Instructions DFO/DFI Series Mechanical Convection Ovens/Incubator
11
In case accessible current is increasing to a value higher than 30 mA under either normal use or single
fault condition, the residual current circuit breaker (RCD) is incorporated for protection against
possible electric shock. The increased accessible current could be from deteriorated electric parts
or wet atmosphere of the oven etc. Regular check of the RCD is requirement for safety. Refer to
4.2 for detailed procedures.
If any over temperature happens
Stb
alarm is displayed, whether it is from shortage sensor,
malfunction of the controller, or localized heating, the over temperature protection thermostat
(STB) is incorporated for protection against overheating and over temperature. Regular check of
the STB is requirement for safety. Refer to 4.3 for detailed procedures.
The first time powering up after repairing or standstill for long period, or at
designated intervals under normal use, check the functionality of the following parts
or components:
Breaking capability of the residual current circuit breaker (RCD) at one month
intervals!
Cutout capability of the over temperature protection device (STB) at six months
intervals!
The ventilating adjustment knob (Fig 1
②
) used to activate the ventilator located at the back of the
oven (Fig 2
①
), allows adjusting of the exchange of the fresh air and hot air. It is highly
recommended to open the ventilator when low operating temperature, cooling down from higher
operating temperature or high humidity within the oven is expected. The ventilator shall be
closed when the operating temperature is maintained at 100°C or higher.
2.2.2 Back view (Fig 2)
Fig 2 Back view
①
Ventilator
②
Power input (15A max)
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