What is the working principle of the mold temperature controller?

Working principle The mold temperature machine is composed of water tank, heating and cooling system, power transmission system, liquid level control system, temperature sensor, injection port and other components. Normally, the pump in the power transmission system makes the hot fluid reach the mold from the water tank with built-in heater and cooler, and then from the mold back to the water tank; the temperature sensor measures the temperature of the hot fluid and transmits the data to the control of the control part The controller adjusts the temperature of the hot fluid, thereby indirectly adjusting the temperature of the mold. When the temperature controller is in production, if the temperature of the mold exceeds the set value of the controller, the controller will open the solenoid valve to connect the water inlet pipe until the temperature of the hot fluid, that is, the temperature of the mold returns to the set value.

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https://www.rhongmachines.com/cooling-and-heating-machinery/mold-temperature-controller/