23
Rotavapor
R-220 EX
4 Putting into Operation
4.15 Reset of the over-temperature protection
The rated cut-out temperature of the over-temperature
cut-out is defined by temperature class T3 and T4. The
safety temperature cutout is fitted with a microswitch with
a flameproof enclosure, which is in the “increased safety“
terminal box of the heater.
The system is based on a liquid-filled capillary tube with a
bellows fitting.
Standard EN 50019 stipulates that the safety temperature
limiter may only be reset using a tool (opening the terminal
box) and then by hand. Automatic resetting is not possible.
The temperature cutout cannot be reset until the temperature
falls below the rated cut-out temperature.
Fig. 4.21: Safety temperature cutout in the heater terminal box
Fig. 4.22: Resetting the safety temperature cutout
