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8.1 External Level Detector<br />
unistat control V3.8.1<br />
The level detector is installed in the open bath, to be thermoregulated. As soon as the level<br />
decreases significantly a dangerous condition exists (a leak?). The level detector connected to<br />
the unistat control passes this on and the unit will be switched off.<br />
For exact description see Appendix D.<br />
8.2 Flow Detector<br />
The flow detector monitors the circulation. If the circulation pressure falls during<br />
thermoregulation<br />
it will release an emergency shut down. (See message 41/X in Appendix B and program 55).<br />
8.3 Fault switches<br />
Depending on the UNISTAT model various sensors will be analysed. Messages inform about<br />
status (see program 10).<br />
8.4 Current Sensor / Power On Self-Test<br />
The current sensor is an important device especially for testing the functions of contactors,<br />
relays and heaters.<br />
By energising such components their function can be evaluated in comparison with the<br />
measured power input.<br />
8.5 Over Heating<br />
Every UNISTAT model is equipped with over heat protection, which operates independently<br />
form the unistat control. Only requires one sensor register excess temperature and the<br />
heating will be switched off immediately. A more comprehensive description is contained in<br />
the operating manual for the particular thermostat.<br />
Chillers without heaters do not have over heat protection.<br />
! The over heat protection should be triggered regularly, by setting the over heat<br />
protection set point temperature just above the present set point and then heat a little.<br />
Only a fully operational over heat protector will help to avoid damage!<br />
8.6 Condensing Temperature Control<br />
During thermoregulation the condensing temperature of the unit is constantly monitored.<br />
When the maximum value is reached the cooling power of the unit will be reduced, reduces<br />
the condenser heat rejection. This condition will be displayed as a message after a few<br />
seconds. The warning will remain, until it is acknowledged (see program 11, „acknowledge<br />
warning„).<br />
Kondens.Temp.!<br />
or<br />
Condens.Temp.!<br />
11<br />
or<br />
T°C condenseur
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