![]() The air-con is switched on and the temperature drops. Let’s imagine the temperature PV in our house is higher than the SP. In our house this will either be cooling or heating depending on whether the PV is higher or lower than the SP respectively. However, if there is a disparity between the SP and the PV we have an error and corrective action is needed. It doesn’t have to do anything, it will set its output to zero. ![]() ![]() If the SP and the PV are the same – then the controller is a very happy little box.
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