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7. Detailed Description
General cut-off
The heater, the compressor and the circulation pump can be
switched off by a relay built into the unit. This general cut-
off will be activated if a malfunction is detected by the safety
sensors.
When the general cut-off switch is activated, the circulator
can only be restarted after the cause of the indicated fault has
been eliminated. The display will show when this has occur-
red. The circulator can then be re-started by pressing the
Reset key.
Protection against over-heating
A built-in temperature limit switch protects against uncon-
trolled heating of the bath liquid by activating the general
cut-off if this limit is exceeded. (This safety device is indepen-
dent of the control temperature sensor that regulates the set
working temperature.)
The temperature cut-off limit is set on the dial at the rear of
the circulator. This has a range of 20 to 95 °C. You should
select a cut-off limit that is 5 to 10 °C above the set working
temperature. If the temperature rises above this limit, the
general cut off is activated and the following error message is
displayed . After the bath liquid has cooled
down to below the cut-off limit, the following code is
displayed .
The built-in temperature limit switch also senses low levels of
coolant. If the liquid level falls and exposes the heating ele-
ment, the temperature will rise above the temperature limit
cut-off level and the general cut-off will be activated. Top up
with coolant to remedy this situation.
The same two error messages shown above will be displayed.
Restart the unit by pressing .
(Regular topping up with the liquid coolant is recommended,
See Section 4.1, Start-up.)
7.4 Description
of safety
features
18